Note : Les descriptions sont présentées dans la langue officielle dans laquelle elles ont été soumises.
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TOBACCO COMPOSITION COMPRISING A TOBACCO COMPONENT AND AN
AEROSOL FORMING MATERIAL
Technical Field
The present invention relates to a tobacco composition comprising an aerosol
forming
.. material, a method for manufacturing a tobacco composition and an article
for use with
an aerosol generation device, the article for use with the aerosol generation
device
comprising the tobacco composition.
Background
ro Many tobacco industry products include an aerosolisable material, such
as a tobacco
composition. Articles, such as cigarettes, cigars and the like, burn the
aerosolisable
material during use to create tobacco smoke. Attempts have been made to
provide
alternatives to these types of articles, which burn the tobacco material, by
creating
products that release compounds without burning. Examples of such products are
so-
1.5 called heat-not-burn products, also known as tobacco heating products
or tobacco
heating devices, which release compounds by heating, but not burning, the
aerosolisable material.
Summary
20 In accordance with embodiments of the invention, in a first aspect there
is provided a
tobacco composition comprising a tobacco component and an aerosol forming
material,
wherein the tobacco component comprises leaf tobacco material in an amount of
between about 10% and about 90% by weight of the tobacco component and wherein
the leaf tobacco material has a nicotine content of greater than 1.5% by
weight of the
25 leaf tobacco material.
In accordance with embodiments of the invention, in a second aspect there is
provided
a tobacco composition comprising a tobacco component and an aerosol forming
material, wherein the tobacco component comprises leaf tobacco material in an
amount
30 .. of between about 10% and about 90% by weight of the tobacco component,
and
wherein the leaf tobacco material comprises said aerosol forming material in
an
amount of up to about io% by weight of the leaf tobacco material, and wherein
the
tobacco composition comprises said aerosol forming material in an amount
between
about 10% and about 30% by weight of the tobacco composition.
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In accordance with embodiments of the invention, in a third aspect there is
provided a
tobacco composition comprising a tobacco component and an aerosol forming
material,
wherein the tobacco component comprises leaf tobacco material in an amount of
between about 10% and about 90% by weight of the tobacco component, and
wherein
the tobacco component comprises menthol in an amount of between about 3 mg and
about 16 mg.
In accordance with embodiments of the invention, in a fourth aspect there is
provided a
method of manufacturing the tobacco composition of the first or second aspects
above,
.ro the method comprising applying said aerosol forming material to said
leaf tobacco
material.
In accordance with embodiments of the invention, in a fifth aspect there is
provided a
tobacco composition manufactured using the method of the fourth aspect above.
In accordance with embodiments of the invention, in a sixth aspect there is
provided a
use of a tobacco composition according to the first, second, third or fourth
aspects
above in an article for use within an aerosol delivery system.
In accordance with embodiments of the invention, in a seventh aspect there is
provided
an article for use in an aerosol provision system comprising the tobacco
composition as
set out in the first, second, third and fourth aspects above.
In accordance with embodiments of the invention, in an eighth aspect there is
provided
a system comprising a tobacco composition as set out in the first, second,
third and
fourth aspects above and a device arranged to heat the tobacco composition and
generate an aerosol from the tobacco composition.
Brief Description of the Drawings
Embodiments of the invention will now be described, by way of example only,
with
reference to the accompanying drawings, in which:
Figure 1 shows a flowchart for a process for making paper reconstituted
tobacco;
Figure 2 shows a flowchart for a process for making extruded tobacco;
Figure 3 shows a flowchart for a process for making a tobacco composition;
Figure 4i5 a side-on cross-sectional view of an article for use with a non-
combustible
aerosol provision device, the article including a mouthpiece;
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Figure 5a is a side-on cross sectional view of a further article for use with
a non-
combustible aerosol provision device, in this example the article including a
capsule-
containing mouthpiece;
Figure 5b is a cross sectional view of the capsule-containing mouthpiece shown
in
Figure 5a;
Figure 6 is a perspective illustration of a non-combustible aerosol provision
device for
generating aerosol from the aerosol generating material of the articles of
Figures 4, 5a
and 5b;
Figure 7 illustrates the device of Figure 6 with the outer cover removed and
without an
article present;
Figure 8 is a side view of the device of Figure 6 in partial cross-section;
Figure 9 is an exploded view of the device of Figure 6, with the outer cover
omitted;
Figure loA is a cross sectional view of a portion of the device of Figure 6;
Figure loB is a close-up illustration of a region of the device of Figure 6;
and
Figure n is a flow diagram illustrating a method of manufacturing an article
for use
with a non-combustible aerosol provision device.
Detailed Description
As used herein, the term "delivery system" is intended to encompass systems
that
deliver a substance to a user, and includes:
non-combustible aerosol provision systems that release compounds from an
aerosolisable material without combusting the aerosolisable material, such as
electronic cigarettes, tobacco heating products, and hybrid systems to
generate aerosol
using a combination of aerosolisable materials;
articles comprising aerosolisable material and configured to be used within
one
of these non-combustible aerosol provision systems; and
aerosol-free delivery systems, such as lozenges, gums, patches, articles
comprising inhalable powders, and smokeless tobacco products such as snus and
snuff,
which deliver a material to a user without forming an aerosol.
According to the present disclosure, a "non-combustible" aerosol provision
system is
one where a constituent aerosolisable material of the aerosol provision system
(or
component thereof) is not combusted or burned in order to facilitate delivery
to a user.
The non-combustible aerosol provision system
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In one embodiment, the delivery system is a non-combustible aerosol provision
system,
such as a powered non-combustible aerosol provision system.
In one embodiment, the non-combustible aerosol provision system is an
electronic
cigarette, also known as a vaping device or electronic nicotine delivery
system (END).
In one embodiment, the non-combustible aerosol provision system is a tobacco
heating
system, also known as a heat-not-burn system.
io In one embodiment, the non-combustible aerosol provision system is a
hybrid system
to generate aerosol using a combination of aerosolisable materials, one or a
plurality of
which may be heated. Each of the aerosolisable materials may be, for example,
in the
form of a solid, liquid or gel. In one embodiment, the hybrid system comprises
a liquid
or gel aerosolisable material and a solid aerosolisable material. The solid
aerosolisable
material may comprise, for example, tobacco material or a non-tobacco product.
Typically, the non-combustible aerosol provision system may comprise a non-
combustible aerosol provision device, also referred to herein as an aerosol
generation
device, and an article for use with the non-combustible aerosol provision
system.
However, it is envisaged that articles which themselves comprise a means for
powering
an aerosol generating component may themselves form the non-combustible
aerosol
provision system.
in one embodiment, the non-combustible aerosol provision device may comprise a
power source and a controller. The power source may be an electric power
source or an
exothermic power source. In one embodiment, the exothermic power source
comprises
a carbon substrate which may be energised so as to distribute power in the
form of heat
to an aerosolisable material or heat transfer material in proximity to the
exothermic
power source. In one embodiment, the power source, such as an exothermic power
source, is provided in the article so as to form the non-combustible aerosol
provision.
In one embodiment, the article for use with the non-combustible aerosol
provision
device may comprise an aerosolisable material, an aerosol generating
component, an
aerosol generating area, a mouthpiece, and/or an area for receiving
aerosolisable
material.
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In one embodiment, the aerosol generating component is a heater capable of
interacting with the aerosolisable material so as to release one or more
volatiles from
the aerosolisable material to form an aerosol. In one embodiment, the aerosol
generating component is capable of generating an aerosol from the
aerosolisable
material without heating. For example, the aerosol generating component may be
capable of generating an aerosol from the aerosolisable material without
applying heat
thereto, for example via one or more of vibrational, mechanical,
pressurisation or
electrostatic means.
ro .. In one embodiment, the aerosolisable material may comprise an active
material, an
aerosol forming material and optionally one or more functional materials. The
active
material may comprise nicotine (optionally contained in tobacco or a tobacco
derivative) or one or more other non-olfactory physiologically active
materials. A non-
olfactory physiologically active material is a material which is included in
the
.. aerosolisable material in order to achieve a physiological response other
than olfactory
perception.
The aerosol forming material may comprise one or more of glycerine, glycerol,
propylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol,
43-butylene
.. glycol, erythritol, meso-Erythritol, ethyl vanillate, ethyl laurate, a
diethyl suberate,
triethyl citrate, triacetin, a diacetin mixture, benzyl benzoate, benzyl
phenyl acetate,
tributyrin, lauryl acetate, lauric acid, myristic acid, and propylene
carbonate.
The one or more functional materials may comprise one or more of flavours,
carriers,
pH regulators, stabilizers, and/or antioxidants.
In one embodiment, the article for use with the non-combustible aerosol
provision
device may comprise aerosolisable material or an area for receiving
aerosolisable
material. In one embodiment, the article for use with the non-combustible
aerosol
provision device may comprise a mouthpiece. The area for receiving
aerosolisable
material may be a storage area for storing aerosolisable material. For
example, the
storage area may be a reservoir. In one embodiment, the area for receiving
aerosolisable material may be separate from, or combined with, an aerosol
generating
area.
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Aerosolisable material, which also may be referred to herein as aerosol
generating
material and aerosol generating substrate, is material that is capable of
generating
aerosol, for example when heated, irradiated or energized in any other way.
Aerosolisable material may, for example, be in the form of a solid, liquid or
gel which
may or may not contain nicotine and/or flavourants. In some embodiments, the
aerosolisable material may comprise an "amorphous solid", which may
alternatively be
referred to as a "monolithic solid" (i.e. non-fibrous). In some embodiments,
the
amorphous solid may be a dried gel. The amorphous solid is a solid material
that may
retain some fluid, such as liquid, within it. In some embodiments, the
aerosolisable
material may for example comprise from about 50wt%, 6owt% or 7owt% of
amorphous
solid, to about 90wt%, 95wt% or loowt% of amorphous solid.
The aerosolisable material may be present on a substrate. The substrate may,
for
example, be or comprise paper, card, paperboard, cardboard, reconstituted
aerosolisable material, a plastics material, a ceramic material, a composite
material,
glass, a metal, or a metal alloy.
An aerosol modifying agent is a substance that is able to modify aerosol in
use. The
agent may modify aerosol in such a way as to create a physiological or sensory
effect on
the human body. Example aerosol modifying agents are flavourants and sensates.
A
sensate creates an organoleptic sensation that can be perceived through the
senses,
such as a cool or sour sensation.
A susceptor is material that is heatable by penetration with a varying
magnetic field,
such as an alternating magnetic field. The heating material may be an
electrically-
conductive material, so that penetration thereof with a varying magnetic field
causes
induction heating of the heating material. The heating material may be
magnetic
material, so that penetration thereof with a varying magnetic field causes
magnetic
hysteresis heating of the heating material. The heating material may be both
electrically-conductive and magnetic, so that the heating material is heatable
by both
heating mechanisms.
Induction heating is a process in which an electrically-conductive object is
heated by
penetrating the object with a varying magnetic field. The process is described
by
Faraday's law of induction and Ohm's law. An induction heater may comprise an
electromagnet and a device for passing a varying electrical current, such as
an
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alternating current, through the electromagnet. When the electromagnet and the
object to be heated are suitably relatively positioned so that the resultant
varying
magnetic field produced by the electromagnet penetrates the object, one or
more eddy
currents are generated inside the object. The object has a resistance to the
flow of
electrical currents. Therefore, when such eddy currents are generated in the
object,
their flow against the electrical resistance of the object causes the object
to be heated.
This process is called Joule, ohmic, or resistive heating. An object that is
capable of
being inductively heated is known as a susceptor.
.ro .. In one embodiment, the susceptor is in the form of a closed circuit. It
has been found
that, when the susceptor is in the form of a closed circuit, magnetic coupling
between
the susceptor and the electromagnet in use is enhanced, which results in
greater or
improved Joule heating.
Magnetic hysteresis heating is a process in which an object made of a magnetic
material
is heated by penetrating the object with a varying magnetic field. A magnetic
material
can be considered to comprise many atomic-scale magnets, or magnetic dipoles.
When
a magnetic field penetrates such material, the magnetic dipoles align with the
magnetic
field. Therefore, when a varying magnetic field, such as an alternating
magnetic field,
for example as produced by an electromagnet, penetrates the magnetic material,
the
orientation of the magnetic dipoles changes with the varying applied magnetic
field.
Such magnetic dipole reorientation causes heat to be generated in the magnetic
material.
When an object is both electrically-conductive and magnetic, penetrating the
object
with a varying magnetic field can cause both Joule heating and magnetic
hysteresis
heating in the object. Moreover, the use of magnetic material can strengthen
the
magnetic field, which can intensify the Joule heating.
In each of the above processes, as heat is generated inside the object itself,
rather than
by an external heat source by heat conduction, a rapid temperature rise in the
object
and more uniform heat distribution can be achieved, particularly through
selection of
suitable object material and geometry, and suitable varying magnetic field
magnitude
and orientation relative to the object. Moreover, as induction heating and
magnetic
hysteresis heating do not require a physical connection to be provided between
the
source of the varying magnetic field and the object, design freedom and
control over the
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heating profile may be greater, and cost may be lower.
Articles, for instance those in the shape of rods, are often named according
to the
product length: "regular" (typically in the range 68 ¨ 75 mm, e.g. from about
68 mm to
about 72 mm), "short" or "mini" (68 mm or less), "king-size" (typically in the
range 75 ¨
91 mm, e.g. from about 79 mm to about 88 mm), "long" or "super-king"
(typically in the
range 91 ¨ 1135 mm, e.g. from about 94 mm to about um mm) and "ultra-long"
(typically in the range from about no mm to about 121 MM).
/0 They are also named according to the product circumference: "regular"
(about 23 ¨ 25
mm), "wide" (greater than 25 mm), "slim" (about 22- 23 mm), "demi-slim" (about
19
-22 mm), "super-slim" (about ¨ mm), and "micro-slim" (less than about 16 mm).
Accordingly, an article in a king-size, super-slim format will, for example,
have a length
of about 83 mm and a circumference of about 17 mm.
Each format may be produced with mouthpieces of different lengths. The
mouthpiece
length will be from about 3omm to 50 mm. A tipping paper connects the
mouthpiece
to the aerosol generating material and will usually have a greater length than
the
mouthpiece, for example from 3 to 10 mm longer, such that the tipping paper
covers
the mouthpiece and overlaps the aerosol generating material, for instance in
the form
of a rod of substrate material, to connect the mouthpiece to the rod.
Articles and their aerosol generating materials and mouthpieces described
herein can
be made in, but are not limited to, any of the above formats.
The terms 'upstream' and 'downstream' used herein are relative terms defined
in
relation to the direction of mainstream aerosol drawn though an article or
device in
use.
The filamentary tow material described herein can comprise cellulose acetate
fibre tow.
The filamentary tow can also be formed using other materials used to form
fibres, such
as polyvinyl alcohol (PVOH), polylactic acid (PLA), polycaprolactone (PCL),
poly(1-4
butanediol succinate) (PBS), poly(butylene adipate-co-terephthalate)(PBAT),
starch
based materials, cotton, aliphatic polyester materials and polysaccharide
polymers or a
combination thereof. The filamentary tow may be plasticised with a suitable
plasticiser
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for the tow, such as triacetin where the material is cellulose acetate tow, or
the tow may
be non-plasticised. The tow can have any suitable specification, such as
fibres having a
'Y' shaped or other cross section such as 'X' shaped, filamentary denier
values between
2.5 and 15 denier per filament, for example between 8.0 and 11.0 denier per
filament
and total denier values of 5,000 to 50,000, for example between 10,000 and
40,000.
As used herein, the term "tobacco material" refers to any material comprising
tobacco
or derivatives or substitutes thereof. The term "tobacco material" may include
one or
more of tobacco, tobacco derivatives, expanded tobacco, reconstituted tobacco
or
tobacco substitutes. The tobacco material may comprise one or more of ground
tobacco, tobacco fibre, cut tobacco, extruded tobacco, leaf tobacco, tobacco
stem,
reconstituted tobacco and/or tobacco extract. As used herein, "leaf tobacco"
means cut
lamina tobacco.
As used herein, the terms "flavour" and "flavourant" refer to materials which,
where
local regulations permit, may be used to create a desired taste or aroma in a
product for
adult consumers.
As used herein, the terms "flavour" and "flavourant" refer to materials which,
where
local regulations permit, may be used to create a desired taste or aroma in a
product for
adult consumers. They may include extracts (e.g., licorice, hydrangea,
Japanese white
bark magnolia leaf, chamomile, fenugreek, clove, menthol, Japanese mint,
aniseed,
cinnamon, herb, wintergreen, cherry, berry, peach, apple, Drambuie, bourbon,
scotch,
whiskey, spearmint, peppermint, lavender, cardamom, celery, cascarilla,
nutmeg,
sandalwood, bergamot, geranium, honey essence, rose oil, vanilla, lemon oil,
orange oil,
cassia, caraway, cognac, jasmine, ylang-ylang, sage, fennel, piment, ginger,
anise,
coriander, coffee, or a mint oil from any species of the genus Mentha),
flavour
enhancers, bitterness receptor site blockers, sensorial receptor site
activators or
stimulators, sugars and/or sugar substitutes (e.g., sucralose, acesulfame
potassium,
aspartame, saccharine, cyclamates, lactose, sucrose, glucose, fructose,
sorbitol, or
mannitol), and other additives such as charcoal, chlorophyll, minerals,
botanicals, or
breath freshening agents. They may be imitation, synthetic or natural
ingredients or
blends thereof. They may be in any suitable form, for example, oil, liquid, or
powder.
Preferably the aerosol generating material or substrate 3 is formed from
tobacco
material as described herein, which includes a tobacco component. The tobacco
component comprises leaf tobacco. In some embodiments, the tobacco component
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comprises tobacco material selected from the group consisting of: extruded
tobacco,
bandcast tobacco, and mixtures thereof.
The leaf tobacco which may be used in the tobacco compositions described
herein may
be any suitable tobacco, such as single grades or blends, cut rag or whole
leaf, including
Virginia (flue-cured and/or air cured) and/or Burley and/or Oriental. The
tobacco
composition may comprise a mixture of any of these leaf tobacco materials.
The leaf tobacco is present in an amount of between about 10% and about go% by
io weight of the tobacco component. In some embodiments, the leaf tobacco
may be
present in an amount of between of between about 11% and about 48%, about 12%
and
about 46%, about 13% and about 44%, about 14% and about 42%, about 15% and
about
40%, about 16% and about 38%, about 17% and about 36%, about 18% and about 34%
or about 19% and about 32% by weight of the tobacco component. In a preferred
embodiment, the tobacco component comprises leaf tobacco in an amount of
between
about 15% and about 25% by weight of the tobacco component, between about 35%
and
about 45% or between about 55% and 65%. In preferred embodiments, the tobacco
component may comprise leaf tobacco in an amount of about 15%, about16%, about
17%, about 18%, about 19%, about 20%, about 21%, about 22%, about 23%, about
24%,
about 25%, about 26%, about 27%, about 28%, about 29% or about 30% by weight
of
the tobacco component.
In some embodiments, the tobacco component comprises leaf tobacco in an amount
of
about 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39%, 40%, 41%, 42%, 43%, 44%,
45%, 46%, 47%, 48%, 49% or 50%, 51%, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59%,
60%, 61%, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69% or 70%.
In the compositions described herein, where amounts are given in % by weight,
for the
avoidance of doubt this refers to a dry weight basis, unless specifically
indicated to the
contrary. Thus, any water that may be present in the tobacco composition, or
in any
component thereof, is entirely disregarded for the purposes of the
determination of the
weight %. The water content of the tobacco compositions described herein may
vary
and maybe, for example, from 5 to 15% by weight. The water content of the
tobacco
compositions described herein may vary according to, for example, the
temperature,
pressure and humidity conditions at which the compositions are maintained. The
water
content can be determined by Karl-Fisher analysis, as described herein.
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On the other hand, for the avoidance of doubt, even when the aerosol forming
material
is a component that is in liquid phase, such as glycerol or propylene glycol,
any
component other than water is included in the weight of the tobacco
composition.
However, when the aerosol forming material is provided in the tobacco
component of
the tobacco composition, or in the filler component (if present) of the
tobacco
composition, instead of or in addition to being added separately to the
tobacco
composition, the aerosol forming material is not included in the weight of the
tobacco
component or filler component, but is included in the weight of the "aerosol
forming
material" in the weight % as defined herein. All other ingredients present in
the tobacco
/o component are included in the weight of the tobacco component, even if
of non-tobacco
origin (for example non-tobacco fibres in the case of paper reconstituted
tobacco).
The tobacco components described herein contain nicotine. The nicotine content
is
from 0.5 to 2% by weight of the tobacco component, and maybe, for example,
from 0.5
/5 to 1.75% by weight of the tobacco component, from 0.8 to 1.2% by weight
of the tobacco
component or from about 0.8 to about 1.75% by weight of the tobacco component.
In
embodiments, the nicotine content may be from o.8 to 1.0% by weight of the
tobacco
component.
20 According to embodiments of one aspect of the disclosure, there is
provided a tobacco
composition comprising a tobacco component and an aerosol forming material,
wherein the tobacco component comprises leaf tobacco in an amount of between
about
10% and about 90% by weight of the tobacco component and wherein the leaf
tobacco
has a nicotine content of greater than 1.5% by weight of the leaf tobacco.
It may be important to control the nicotine content of the composition. In
conventional
tobacco heating products, the tobacco composition mainly comprises
reconstituted
tobacco material. The nicotine content of reconstituted tobacco material is
generally
relatively low. For example, the reconstituted tobacco material may comprise
nicotine
in an amount of less than about 1.5% by weight of the reconstituted tobacco
material.
Increasing the nicotine content of such compositions is challenging.
The inventors have found that the nicotine content of the tobacco composition
may be
carefully controlled by incorporating leaf tobacco into the composition, in
addition to
the reconstituted tobacco material. In particular, incorporating leaf tobacco
having a
nicotine content of more than 1.5% (by weight of the composition) into the
composition
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has been found to be particularly advantageous. Incorporating leaf tobacco
having a
nicotine content of greater than about 1.5% by weight has been found to
enhance the
organoleptic properties (e.g. taste) of the tobacco composition when heated.
Without wishing to be bound by theory, it is thought that incorporating leaf
tobacco
material having a nicotine content of greater than 1.5% by weight of the leaf
tobacco
material into the composition facilitates the release of components from the
tobacco
composition that have a positive impact on the sensory properties of the
tobacco
composition when it is heated by an aerosol generation device. Advantageously,
the
.ro amount of nicotine delivered to a user from the tobacco composition
comprising leaf
tobacco material having a nicotine content of greater than 1.5% by weight of
the leaf
tobacco material when it is heated in an aerosol generation device may be
similar to the
amount of nicotine delivered to a user of a conventional combustible smoking
article.
In an embodiment, the tobacco material consists essentially of the tobacco
component
as defined herein and the aerosol forming material as defined herein. In an
embodiment, the tobacco material consists of the tobacco component as defined
herein
and the aerosol forming material as defined herein.
The tobacco composition comprises a tobacco component and an aerosol forming
material. The tobacco component may comprise leaf tobacco material in an
amount of
between about 10% and about 90% by weight of the tobacco component and the
leaf
tobacco material may comprise said aerosol forming material in an amount of up
to
about 10% by weight of the leaf tobacco material. The tobacco composition may
comprise said aerosol forming material in an amount between about 10% and
about
30% by weight of the tobacco composition. Preferably, the tobacco composition
comprises the aerosol forming material in an amount of between about 10% and
about
20% by weight of the tobacco composition.
The inclusion of aerosol forming material in an amount of between about 10%
and
about 30% by weight of the tobacco composition has been found to further
enhance the
sensory properties of the tobacco composition when heated by an aerosol
generation
device. Advantageously, the loading of the aerosol generating material of
between
about 10% and about 30% by weight of the tobacco composition may render the
sensory properties of the composition similar to the sensory properties of a
conventional combustible smoking article.
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The tobacco composition may comprise a tobacco component and an aerosol
forming
material, wherein the tobacco component comprises leaf tobacco material in an
amount
of between about 10% and about 90% by weight of the tobacco component, and
wherein the tobacco component comprises menthol in an amount of between about
3 mg to about 16 mg. Advantageously, the loading of the menthol in an amount
of
between about 3mg and about 16 mg by weight of the tobacco component may
improve
the sensory properties of the tobacco composition when it is heated by an
aerosol
generation device.
/o The leaf tobacco has a nicotine content of greater than 1.5% by weight
of the leaf
tobacco. In some embodiments, the leaf tobacco has a nicotine content of
between 1.5%
and about 5% by weight of the leaf tobacco, preferably between about 1.5% and
about
4% by weight of the leaf tobacco. The leaf tobacco may have a nicotine content
of 1.5%,
1.6%, 1.7%, 1.8%, 1.9%, 2%, 2.1%, 2.2%, 2.3%, 2.4%, 2.5%, 2.6%, 2.7%, 2.8%,
2.9%, 3%,
3.1%, 3.2%, 3.3%, 3.4%, 3.5%, 3.6%, 3.7%, 3.8%, 3.9%, 4%, 4.1%, 4.2%, 4.3%,
4.4%,
4.5%, 4.6%, 4.7%, 4.8%, 4.9% or 5% by weight of the leaf tobacco. In some
embodiments, the leaf tobacco has a nicotine content of more than about 1.5%
and up
to about 4% by weight of the leaf tobacco material.
The remainder of the tobacco component may comprise paper reconstituted
tobacco,
extruded tobacco, bandcast reconstituted tobacco, or a combination of bandcast
reconstituted tobacco and another form of tobacco, such as tobacco granules.
Preferably, the tobacco component comprises paper reconstituted tobacco
material.
Paper reconstituted tobacco refers to tobacco material formed by a process in
which
tobacco feedstock is extracted with a solvent to afford an extract of solubles
and a
residue comprising fibrous material, and then the extract (usually after
concentration,
and optionally after further processing) is recombined with fibrous material
from the
residue (usually after refining of the fibrous material, and optionally with
the addition
of a portion of non-tobacco fibres) by deposition of the extract onto the
fibrous
material. The process of recombination resembles the process for making paper.
The paper reconstituted tobacco may be any type of paper reconstituted tobacco
that is
known in the art. In a particular embodiment, the paper reconstituted tobacco
is made
from a feedstock comprising one or more of tobacco strips, tobacco stems, and
whole
leaf tobacco. In a further embodiment, the paper reconstituted tobacco is made
from a
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feedstock consisting of tobacco strips and/or whole leaf tobacco, and tobacco
stems.
However, in other embodiments, scraps, fines and winnowings can alternatively
or
additionally be employed in the feedstock.
The paper reconstituted tobacco for use in the tobacco material described
herein may
be prepared by methods which are known to those skilled in the art for
preparing paper
reconstituted tobacco.
Referring to Figure 1, tobacco furnish such as leaf, strips, stems, scraps,
fines, and/or
winnowings (in some embodiments, leaf, strips and stems), are initially mixed
with an
aqueous solvent (e.g. water, water and water miscible solvents such as
ethanol).
Distilled water, deionized water, or tap water may be employed. The suspension
of
tobacco in the solvent is agitated by stirring or shaking for instance in
order to increase
the rate of extraction of the soluble portion from the fibrous portion of
tobacco. The
agitation is typically carried out for half an hour up to 6 hours. Agitation
may be
achieved in an agitator that comprises a vessel and a blade to achieve
agitation. The
amount of solvent in the suspension can vary widely from about 75 to 99% by
weight of
the suspension, depending on the tobacco furnish, the type of solvent and
agitation
equipment (in particular the blade type), and the temperature of the
suspension. The
.. typical range of suspension temperature is about lo C to about 100 C.
The soluble portion of the tobacco furnish is separated from the insoluble
fibrous
portion of tobacco, for example by pressing with a pneumatic, hydraulic or
mechanical
press, or by filtration. After the separation, the fibrous portion of tobacco
is typically
subjected to mechanical refining to produce a fibrous pulp. Suitable refiners
can be
typically disc refiners or conical refiners. The fibrous pulp will be then
formed into a
base web comprising the tobacco fibrous pulp on a papermaking station, such as
a
Fourdriniertype papermaldng machine. It is typically laid onto a flat wire
belt where
excess water is removed by gravity drain and suction drain. Non-tobacco fibre,
such as
cellulose, wheat fibre or wood fibre, may be included with the tobacco-derived
fibrous
portion at this stage. The soluble portion of the tobacco feedstock is
concentrated using
any known type of concentrator such as film evaporator or vacuum evaporator.
After
concentration, ingredients such as aerosol forming materials (as defined
herein),
casings, for example cocoa, liquorice, and acids such as malic acid, or
flavours (as
defined herein) may be added and mixed with the concentrated tobacco solubles.
Then
concentrated tobacco solubles potentially containing aerosol forming materials
and/or
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casings and/or flavours are recombined with the dried tobacco fibrous sheet to
form
reconstituted tobacco. The concentrated solubles can be added back to the
fibrous web
with various methods, such as spraying, coating, saturating, sizing.
Finally, the reconstituted tobacco is dried. It may optionally be cut into
strips or wound
into a roll and then slit into bobbins or shredded into cut rag. As used
herein, the terms
"flavour" and "flavouring" refer to materials which, where local regulations
permit, may
be used to create a desired taste or aroma in a product for adult consumers.
They may
include extracts (e.g., liquorice, hydrangea, Japanese white bark magnolia
leaf,
chamomile, fenugreek, clove, menthol, Japanese mint, aniseed, cinnamon, herb,
wintergreen, cherry, berry, peach, apple, Drambuie, bourbon, scotch, whiskey,
spearmint, peppermint, lavender, cardamom, celery, cascarilla, nutmeg,
sandalwood,
bergamot, geranium, honey essence, rose oil, vanilla, lemon oil, orange oil,
cassia,
caraway, cognac, jasmine, ylang-ylang, sage, fennel, piment, ginger, anise,
coriander,
coffee, or a mint oil from any species of the genus Mentha), flavour
enhancers,
bitterness receptor site blockers, sensorial receptor site activators or
stimulators, sugars
and/or sugar substitutes (e.g., sucralose, acesulfame potassium, aspartame,
saccharine,
cyclamates, lactose, sucrose, glucose, fructose, sorbitol, or mannitol), and
other
additives such as charcoal, chlorophyll, minerals, botanicals, or breath
freshening
agents. They may be imitation, synthetic or natural ingredients or blends
thereof. They
may be in any suitable form, for example, oil, liquid, or powder. Examples of
paper
reconstituted tobacco that may be used in the present invention are provided
in the
Examples.
The tobacco component may comprise a mixture of leaf tobacco and paper
reconstituted tobacco material. The paper reconstituted tobacco material may
have a
nicotine content of less than the nicotine content of an equivalent weight of
the leaf
tobacco. For example, the reconstituted tobacco material may have a nicotine
content
of less than 1.5% by weight of the reconstituted tobacco material.
It has been advantageously found that using a tobacco leaf with nicotine
content higher
than 1.5% in combination with a lower nicotine base material, such as paper
reconstituted tobacco, provides a tobacco material with an appropriate
nicotine level
but better sensory performance than the use of paper reconstituted tobacco
alone.
The tobacco component may comprise paper reconstituted tobacco in an amount of
between about to% to about 90% by weight of the tobacco component. In
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embodiments, the paper reconstituted tobacco is present in an amount of from
ro% to
80% by weight or 20% to 70% by weight, of the tobacco component. In some
embodiments, the tobacco component comprises paper reconstituted tobacco
material
in an amount of between about 50% and about 90% of the tobacco component.
In some embodiments, the reconstituted tobacco may be present in an amount of
between of between about 10% and about 89%, about 20% and about 88%, about 30%
and about 87%, about 40% and about 86%, about 50% and about 85%, about 60% and
about 84%, about 70% and about 83% by weight of the tobacco component. In some
embodiments, the tobacco component may comprise reconstituted tobacco in an
/o amount of between about 75% and about 85% by weight of the tobacco
component.
In preferred embodiments, the tobacco component may comprise reconstituted
tobacco
in an amount of about 70%, about 71%, about 72%, about 73%, about 74%, about
75%,
about 76%, about 77%, about 78%, about 79%, about 80%, about 81%, about 82%,
about 83%, about 84% or about 85% by weight of the tobacco component.
In one embodiment, the leaf tobacco is present in an amount of at least 10% by
weight
of the tobacco component, while the remainder of the tobacco component
comprises
paper reconstituted tobacco, bandcast reconstituted tobacco, or a combination
of
bandcast reconstituted tobacco and another form of tobacco such as tobacco
granules.
The reconstituted tobacco material may have a density of less than about 700
milligrams per cubic centimetre (mg/cc).
Such tobacco material has been found to be particularly effective at providing
an
aerosol generating material which can be heated quickly to release an aerosol,
as
compared to denser materials. For instance, the inventors tested the
properties of
various aerosol generating materials, such as bandcast reconstituted tobacco
material
and paper reconstituted tobacco material, when heated. It was found that, for
each
given aerosol generating material, there is a particular zero heat flow
temperature
below which net heat flow is endothermic, in other words more heat enters the
material
than leaves the material, and above which net heat flow is exothermic, in
other words
more heat leaves the material than enters the material, while heat is applied
to the
material. Materials having a density less than 700 mg/cc had a lower zero heat
flow
temperature. Since a significant portion of the heat flow out of the material
is via the
formation of aerosol, having a lower zero heat flow temperature has a
beneficial effect
on the time it takes to first release aerosol from the aerosol generating
material. For
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instance, aerosol generating materials having a density of less than 700 mg/cc
were
found to have a zero heat flow temperature of less than 164 C, as compared to
materials
with a density over 700 mg/cc, which had zero heat flow temperatures greater
than
164 C.
The density of the aerosol generating material also has an impact on the speed
at which
heat conducts through the material, with lower densities, for instance those
below 700
mg/cc, conducting heat more slowly through the material, and therefore
enabling a
more sustained release of aerosol.
io The weight ratio of the leaf tobacco relative to the paper reconstituted
tobacco material
may be io:90, 11:89, 12:88, 13:87, 4:86, 15:85, 16:84, 17:83, 18:82, 19:81,
20:80, 21:79,
22:78, 23:77, 24:76, 25:75, 26:74, 27:73, 28:72, 29:71, 30:70, 31:69, 32:68,
33:67,
34:66, 35:65, 36:64, 37:63, 38:62, 39:61, 40:60, 41:59, 42:58, 43:57,
44:56,45:55,
46:54, 47:53, 48:52, 49:51, 50:50, 51:49, 52:48, 53:47, 54:46, 55:45,
56:44,57:43,
/5 58:42, 59:41, 60:40, 61:39, 62:38, 63:37, 64:36, 65:35, 66:34, 67:33,
68:32,69:31,
70:30, 71:29, 72:28, 73:27, 74:26, 75:25, 76:24, 77:23, 78:22, 79:21, 80:20,
81:19, 82:18,
83:17,84:16, 85:15, 86:14, 87:13, 88:12, 89:11 or 90:10 (weight of leaf
tobacco:weight
paper reconstituted tobacco).
20 Preferably, the aerosol generating material 3 comprises reconstituted
tobacco material
having a density of less than about 700 mg/cc, for instance paper
reconstituted tobacco
material. More preferably, the aerosol generating material 3 comprises
reconstituted
tobacco material having a density of less than about 600 mg/cc. Alternatively
or in
addition, the aerosol generating material 3 preferably comprises reconstituted
tobacco
25 material having a density of at least 350 mg/cc, which is considered to
allow for a
sufficient amount of heat conduction through the material.
The tobacco composition comprises an aerosol forming material. In this
context, an
"aerosol forming material" is an agent that promotes the generation of an
aerosol. An
30 aerosol forming material may promote the generation of an aerosol by
promoting an
initial vaporisation and/or the condensation of a gas to an inhalable solid
and/or liquid
aerosol. In some embodiments, an aerosol forming material may improve the
delivery
of flavour from the aerosol generating material.
35 In general, any suitable aerosol forming material or agents may be
included in the
aerosol generating material of the invention. Suitable aerosol forming
materials
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include, but are not limited to: a polyol such as sorbitol, glycerol, and
glycols like
propylene glycol or triethylene glycol; a non-polyol such as monohydric
alcohols, high
boiling point hydrocarbons, acids such as lactic acid, glycerol derivatives,
esters such as
diacetin, triacetin, triethylene glycol diacetate, triethyl citrate or
myristates including
ethyl myristate and isopropyl myristate and aliphatic carboxylic acid esters
such as
methyl stearate, dimethyl dodecanedioate and dimethyl tetradecanedioate.
In a preferred embodiment, the aerosol forming material is selected from the
group
consisting of: glycerol, sorbitol, propylene glycol, triethylene glycol,
lactic acid, diacetin,
triacetin, triethylene glycol diacetate, trieth3r1 citrate, ethyl myristate,
isopropyl
myristate, methyl stearate, dimethyl dodecanedioate, dimethyl
tetradecanedioate, and
mixtures thereof.
The aerosol forming material has been found to improve the sensory performance
of a
an article for use with an aerosol generation device comprising the tobacco
composition, by helping to transfer compounds such as flavour compounds from
the
tobacco material to the consumer.
The aerosol forming material may be included in any component of the tobacco
composition. Alternatively or additionally the aerosol forming material may be
added
to the tobacco composition separately. In either case, the total amount of the
aerosol
forming material in the tobacco material should be as defined herein.
The leaf tobacco material may comprise the aerosol forming material in an
amount of
up to about 10% by weight of the leaf tobacco material. In other embodiments,
the leaf
tobacco may comprise the aerosol forming material in an amount of up to about
20% or
between about 15% and about 20% by weight of the leaf tobacco. The leaf
tobacco may
comprise the aerosol forming material in an amount of from about 5%, about 10%
or
about 15% by weight of the leaf tobacco.
To achieve an overall level of aerosol forming material between 10% and 20% by
weight
of the tobacco material, it has been advantageously found that this can be
added in
higher weight percentages to the another component of the tobacco material,
such as
reconstituted tobacco material.
According to embodiments of one aspect of the disclosure, a tobacco
composition is
provided comprising a tobacco component and an aerosol forming material,
wherein
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the tobacco component comprises leaf tobacco material in an amount of between
about
10% and about 90% by weight of the tobacco component, and wherein the leaf
tobacco
material comprises said aerosol forming material in an amount of up to about
10% by
weight of the leaf tobacco material, and wherein the tobacco composition
comprises
said aerosol forming material in an amount between about 10% and about 30% by
weight of the tobacco composition. Preferably, the tobacco composition
comprises the
aerosol forming material in an amount of between about 10% and about 20% by
weight
of the tobacco composition.
/o In some embodiments, the aerosol forming material may be glycerol,
propylene glycol,
or a mixture of glycerol and propylene glycol. Preferably, the aerosol forming
material
comprises glycerol. Glycerol may be present in an amount of from 10 to 20% by
weight
of the tobacco material, for example 13 to 16 % by weight of the composition,
or about
14% or 15% by weight of the composition. Propylene glycol, if present, may be
present
in an amount of from 0.1 to 0.3% by weight of the composition.
The aerosol forming material may be included in a component of the tobacco
composition. For example, the aerosol forming material may be included in the
reconstituted tobacco and/or in a filler component, if present.
Alternatively or additionally the aerosol forming material may be applied to
the tobacco
material separately. In either case, the total amount of the aerosol forming
material in
the tobacco material should be as defined herein.
The paper reconstituted tobacco material may comprise the aerosol forming
material.
The paper reconstituted tobacco material may comprise the aerosol forming
material in
an amount of between about 10% and about 20% by weight of the reconstituted
tobacco
material. In some embodiments, the paper reconstituted tobacco material may
comprise the aerosol forming material in an amount of about 10%, about 11%,
about
12%, about 13%, about 14%, about 15%, about 16%, about 17%, about 18%, about
19% or
about 20% by weight of the reconstituted tobacco material.
The tobacco material described herein can contain an aerosol modifying agent,
such as
any of the flavours described herein. In one embodiment, the tobacco material
contains menthol, forming a mentholated article. The tobacco material can
comprise
from 3mg to 2omg of menthol, preferably between 5mg and 18mg and more
preferably
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between 8mg and 1.6mg of menthol. In the present example, the tobacco material
comprises 16mg of menthol. The tobacco material can contain between 2% and 8%
by
weight of menthol, preferably between 3% and 7% by weight of menthol and more
preferably between 4% and 5.5% by weight of menthol. In one embodiment, the
tobacco material includes 4.70/, by weight of menthol. Such high levels of
menthol
loading can be achieved using a high percentage of reconstituted tobacco
material, for
instance greater than 5o% of the tobacco material by weight. Alternatively or
additionally, the use of a high volume of aerosol generating material, for
instance
tobacco material, can increase the level of menthol loading that can be
achieved. for
.ro instance where greater than about 500 mm 3 or suitably more than about
r000 mm 3 of
aerosol generating material, such as tobacco material, are used.
The tobacco material may be provided in the form of cut rag tobacco. The cut
rag
tobacco can have a cut width of at least is cuts per inch (about 5.9 cuts per
cm,
equivalent to a cut width of about 1.7mm). Preferably, the cut rag tobacco has
a cut
width of at least 18 cuts per inch (about 7.1 cuts per cm, equivalent to a cut
width of
about 1.4mm), more preferably at least 20 cuts per inch (about 7.9 cuts per
cm,
equivalent to a cut width of about 1.27mm). In one example, the cut rag
tobacco has a
cut width of 22 cuts per inch (about 8.7 cuts per cm, equivalent to a cut
width of about
1.15mm). Preferably, the cut rag tobacco has a cut width at or below 40 cuts
per inch
(about 15.7 cuts per cm, equivalent to a cut width of about 0.64mm). Cut
widths
between 0.5 mm and 2.0 mm, for instance between 0.6 mm and 1.5 mm, or between
0.6 mm and 1.7nun, have been found to result in tobacco material which is
preferable
in terms of surface area to volume ratio, particularly when heated, and the
overall
density and pressure drop of the substrate 3. The cut rag tobacco can be
formed from a
mixture of forms of tobacco material, for instance a mixture of leaf tobacco
and one or
more of paper reconstituted tobacco, extruded tobacco and bandcast tobacco.
Preferably the tobacco material comprises paper reconstituted tobacco.
The leaf tobacco and/or the paper reconstituted tobacco material may comprise
a width
of between about 0.5 mm and about 2 mm, between about o.6 mm and about 1.75
mm,
between about o.6 mm and about 1.7 mm or between about 0.7 and about 1.5 mm.
In the tobacco compositions described herein, the tobacco composition may
comprise a
filler component. The filler component is generally a non-tobacco component,
that is, a
component that does not include ingredients originating from tobacco. The
filler
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component may be a non-tobacco fibre such as wood fibre or pulp or wheat
fibre. The
filler component may also be an inorganic material such as chalk, perlite,
vermiculite,
diatomaceous earth, colloidal silica, magnesium oxide, magnesium sulphate,
magnesium carbonate. The filler component may also be a non-tobacco cast
material or
a non-tobacco extruded material.
The filler component may be present in an amount of o to 20% by weight of the
tobacco
material, or in an amount of from ito 10% by weight of the composition. In a
preferred
embodiment, the tobacco composition comprises between about 5% and about to%
by
io weight of the tobacco composition. In some embodiments, the filler
component is
absent.
Extruded tobacco may optionally be included in the tobacco compositions
described
herein. If extruded tobacco is included, it may be present, for example, in an
amount of
/5 from 10 to 30% by weight, or 10 to 20% by weight, of the tobacco
component. The
extruded tobacco which may be used in the tobacco compositions described
herein may
be prepared by methods which are known to those skilled in the art for
preparing
extruded tobacco. In some embodiments, extruded tobacco can be prepared as
follows. The tobacco furnish may include Virginia (flue cured) tobacco, Burley
tobacco,
20 and/or Oriental tobacco. The tobacco furnish may be stems, scraps,
strips, fines, or
winnowings. Additional components may include non-tobacco fibre, such as straw
fibre
or wheat fibres; binders, for example celluloses or modified celluloses such
ashydroxypropyl cellulose and carboxymethylcellulose; and casings, for example
acids
such as malic acid.
As shown in Figure 2, the tobacco furnish and any additional components are
mixed in
a mixing silo, and conveyed by a dosing screw and conveyor screw to an
extruder,
where they are mixed with water, and at this stage an aerosol forming material
may
also be added. After extrusion, the extruded tobacco is cooled on a cooling
belt.
An analogous material to those described above in the section, but made using
only
non-tobacco fibres, such as wheat fibre or wood fibre, may be used in the
filler
component of the tobacco composition.
According to some embodiments of an aspect of the disclosure, there is
provided a
method of manufacturing the tobacco composition as described herein, wherein
the
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method comprises applying an aerosol forming material as described herein to
the leaf
tobacco material.
The method may comprise combining the leaf tobacco material with paper
reconstitute
tobacco material comprising aerosol forming material in an amount of between
10%
and 20% by weight of the paper reconstitute tobacco material.
As shown in Figure 3, the tobacco composition may be manufactured by a method
comprising applying the aerosol forming material to the leaf tobacco and then
.ro combining the leaf tobacco comprising the aerosol forming material with
the
reconstituted tobacco material.
For example, the aerosol forming material may be applied to the leaf tobacco
by
spraying it onto the leaf tobacco or by soaking the leaf tobacco in the
aerosol forming
material. Alternatively or in addition, the tobacco composition may be
manufactured
by applying the aerosol forming material to the reconstituted tobacco
material.
According to embodiments of an aspect of the disclosure there is provided a
tobacco
composition manufactured by the methods described herein.
According to embodiments of an aspect of the disclosure, the tobacco
compositions
described herein are used in an article for use with an aerosol generation
device. The
tobacco compositions may be used in a process for manufacturing an article for
use
with an aerosol generation device.
According to embodiments of an aspect of the disclosure, there is provided an
article
for use with an aerosol generation device comprising a tobacco composition as
described herein. The article for use with an aerosol generation device
comprises a rod
of the tobacco composition. The rod may have a total weight of between about
250 mg
and about 350 mg.
In an embodiment, the tobacco composition may be wrapped in a wrapper having a
permeability of less than loco Coresta Units.
The article for use with an aerosol generation device may comprise
reconstituted
tobacco material having a density of less than about 700 milligrams per cubic
centimetre.
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The article for use with an aerosol generation device may have an outer
circumference
of at least about 19 mm, preferably between about 19 mm and about 23 mm or
about
21 mm. This may facilitate insertion of the article for use with an aerosol
generation
device into the aerosol generation device.
According to embodiments of an aspect of the disclosure, there is provided a
system
comprising a tobacco composition as described herein and a device arranged to
heat
the tobacco composition and generate an aerosol from the tobacco composition.
io In some embodiments, the system comprises an article for use with an
aerosol
generation device as described herein and the aerosol generation device is
arranged to
receive at least a portion of the article for use with an aerosol generation
device
comprising the tobacco composition and to heat the portion of the article for
use with
an aerosol generation device comprising the tobacco composition and generate
an
aerosol from the tobacco composition.
Figure 4 is a side-on cross sectional view of an article 1 for use with a non-
combustible
aerosol provision device.
The article 1 comprises a mouthpiece 2, and a cylindrical rod of aerosol
generating
material 3, in the present case tobacco material, connected to the mouthpiece
2. The
aerosol generating material 3, also referred to herein as an aerosol
generating substrate
3, comprises at least one aerosol forming material. In the present example,
the aerosol
forming material is glycerol. In alternative examples, the aerosol forming
material can
be another material as described herein or a combination thereof. The aerosol
forming
material has been found to improve the sensory performance of the article, by
helping
to transfer compounds such as flavour compounds from the aerosol generating
material
to the consumer. However, an issue with adding such aerosol forming materials
to the
aerosol generating material within an article for use in a non-combustible
aerosol
provision system can be that, when the aerosol forming material is aerosolised
upon
heating, it can increase the mass of aerosol which is delivered by the
article, and this
increased mass can maintain a higher temperature as it passes through the
mouthpiece.
As it passes through the mouthpiece, the aerosol transfers heat into the
mouthpiece and
this warms the outer surface of the mouthpiece, including the area which comes
into
contact with the consumers lips during use. The mouthpiece temperature can be
significantly higher than consumers may be accustomed to when smoking, for
instance,
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conventional cigarettes, and this can be an undesirable effect caused by the
use of such
aerosol forming materials.
The part of the mouthpiece which comes into contact with a consumer's lips has
usually
been a paper tube, which is either hollow or surrounds a cylindrical body of
filter
material.
As shown in Figure 4, the mouthpiece 2 of the article 1 comprises an upstream
end 2a
adjacent to the aerosol generating substrate 3 and a downstream end 2b distal
from the
io aerosol generating substrate 3. At the downstream end 2h, the mouthpiece
2 has a
hollow tubular element 4 formed from filamentary tow. This has advantageously
been
found to significantly reduce the temperature of the outer surface of the
mouthpiece 2
at the downstream end 2b of the mouthpiece which comes into contact with a
consumer's mouth when the article 1 is in use. In addition, the use of the
tubular
element 4 has also been found to significantly reduce the temperature of the
outer
surface of the mouthpiece 2 even upstream of the tubular element 4. Without
wishing
to be bound by theory, it is hypothesised that this is due to the tubular
element 4
channelling aerosol closer to the centre of the mouthpiece 2, and therefore
reducing the
transfer of heat from the aerosol to the outer surface of the mouthpiece 2.
In the present example, the article 1 has an outer circumference of about 21
mm (i.e. the
article is in the demi-slim format). In other examples, the article can be
provided in
any of the formats described herein, for instance having an outer
circumference of
between 15mm and 25mm. Since the article is to be heated to release an
aerosol,
improved heating efficiency can be achieved using articles having lower outer
circumferences within this range, for instance circumferences of less than
23mm. To
achieve improved aerosol via heating, while maintaining a suitable product
length,
article circumferences of greater than 19mm have also been found to be
particularly
effective. Articles having circumferences of between 1.9rnm and 23mm, and more
preferably between 20MM and 22rrun, have been found to provide a good balance
between providing effective aerosol delivery while allowing for efficient
heating.
The outer circumference of the mouthpiece 2 is substantially the same as the
outer
circumference of the rod of aerosol generating material 3, such that there is
a smooth
transition between these components. In the present example, the outer
circumference
of the mouthpiece 2 is about 20.8mm. A tipping paper 5 is wrapped around the
full
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length of the mouthpiece 2 and over part of the rod of aerosol generating
material 3 and
has an adhesive on its inner surface to connect the mouthpiece 2 and rod 3. In
the
present example, the tipping paper 5 extends 5 mm over the rod of aerosol
generating
material 3 but it can alternatively extend between 3 mm and 10 mm over the rod
3, or
more preferably between 4 mm and 6 mm, to provide a secure attachment between
the
mouthpiece 2 and rod 3. The tipping paper 5 can have a basis weight which is
higher
than the basis weight of plug wraps used in the article 1, for instance a
basis weight of
40 gsm to 80 gsm, more preferably between 50 gsm and 70 gsm, and in the
present
example 58 gsm. These ranges of basis weights have been found to result in
tipping
/o papers having acceptable tensile strength while being flexible enough to
wrap around
the article 1 and adhere to itself along a longitudinal lap seam on the paper.
The outer
circumference of the tipping paper 5, once wrapped around the mouthpiece 2, is
about
21MM.
/5 The "wall thickness" of the hollow tubular element 4 corresponds to the
thickness of the
wall of the tube 4 in a radial direction. This may be measured, for example,
using a
calliper. The wall thickness is advantageously greater than o.9mm, and more
preferably
Lomm or greater. Preferably, the wall thickness is substantially constant
around the
entire wall of the hollow tubular element 4. However, where the wall thickness
is not
20 substantially constant, the wall thickness is preferably greater than
0.9 mm at any point
around the hollow tubular element 4, more preferably tomm or greater.
Preferably, the length of the hollow tubular element 4 is less than about 20
mm. More
preferably, the length of the hollow tubular element 415 less than about 1,5
mm. Still
25 more preferably, the length of the hollow tubular element 4 is less than
about 10 mm.
In addition, or as an alternative, the length of the hollow tubular element 4
is at least
about 5 mm. Preferably, the length of the hollow tubular element 4 is at least
about 6
mm. In some preferred embodiments, the length of the hollow tubular element 4
is
from about 5 mm to about 20 mm, more preferably from about 6 mm to about 10
mm,
30 even more preferably from about 6 mm to about 8 mm, most preferably
about 6 mm, 7
mm or about 8 mm. In the present example, the length of the hollow tubular
element 4
is 6 mm.
Preferably, the density of the hollow tubular element 4 is at least about 0.25
grams per
35 cubic centimetre (g/cc), more preferably at least about 0.3 g/cc.
Preferably, the density
of the hollow tubular element 4 is less than about 0.75 grams per cubic
centimetre
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(g/cc), more preferably less than 0.6 g/cc. In some embodiments, the density
of the
hollow tubular element 4 is between 0.25 and 0.75 g/cc, more preferably
between 0.3
and o.6 g/cc, and more preferably between 0.4 g/cc and o.6 g/cc or about 0.5
g/cc.
These densities have been found to provide a good balance between improved
firmness
afforded by denser material and the lower heat transfer properties of lower
density
material. For the purposes of the present invention, the "density" of the
hollow tubular
element 4 refers to the density of the filamentary tow forming the element
with any
plasticiser incorporated. The density may be determined by dividing the total
weight of
the hollow tubular element 4 by the total volume of the hollow tubular element
4,
io wherein the total volume can be calculated using appropriate
measurements of the
hollow tubular element 4 taken, for example, using callipers. Where necessary,
the
appropriate dimensions may be measured using a microscope.
The filamentary tow forming the hollow tubular element 4 preferably has a
total denier
of less than 45,000, more preferably less than 42,000. This total denier has
been found
to allow the formation of a tubular element 4 which is not too dense.
Preferably, the
total denier is at least 20,000, more preferably at least 25,000. In preferred
embodiments, the filamentary tow forming the hollow tubular element 4 has a
total
denier between 25,000 and 45,000, more preferably between 35,000 and 45,000.
Preferably the cross-sectional shape of the filaments of tow are 'Y' shaped,
although in
other embodiments other shapes such as 'X' shaped filaments can be used.
The filamentary tow forming the hollow tubular element 4 preferably has a
denier per
filament of greater than 3. This denier per filament has been found to allow
the
formation of a tubular element 4 which is not too dense. Preferably, the
denier per
filament is at least 4, more preferably at least 5. In preferred embodiments,
the
filamentary tow forming the hollow tubular element 4 has a denier per filament
between 4 and 10, more preferably between 4 and 9. In one example, the
filamentary
tow forming the hollow tubular element 4 has an 8Y40,000 tow formed from
cellulose
acetate and comprising 18% plasticiser, for instance triacetin.
The hollow tubular element 4 preferably has an internal diameter of greater
than
3.omm. Smaller diameters than this can result in increasing the velocity of
aerosol
passing though the mouthpiece 2 to the consumer's mouth more than is
desirable, such
that the aerosol becomes too warm, for instance reaching temperatures greater
than
C or greater than 45 C. More preferably, the hollow tubular element 4 has an
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internal diameter of greater than 3.1mm, and still more preferably greater
than 3.5mm
or 3.6mm. In one embodiment, the internal diameter of the hollow tubular
element 4
is about 3.9mm.
The hollow tubular element 4 preferably comprises from 15% to 22% by weight of
plasticiser. For cellulose acetate tow, the plasticiser is preferably
triacetin, although
other plasticisers such as polyethylene glycol (PEG) can be used. More
preferably, the
tubular element 4 comprises from 16% to 20% by weight of plasticiser, for
instance
about17%, about 18% or about 19% plasticiser.
/o The pressure drop or difference (also referred to a resistance to draw)
across the
mouthpiece, for instance the part of the article 1 downstream of the aerosol
generating
material 3, is preferably less than about 40 mmH2o. Such pressure drops have
been
found to allow sufficient aerosol, including desirable compounds such as
flavour
compounds, to pass through the mouthpiece 2 to the consumer. More preferably,
the
pressure drop across the mouthpiece 2 is less than about 32mmH20. In some
embodiments, particularly improved aerosol has been achieved using a
mouthpiece 2
having a pressure drop of less than 31 mmH2o, for instance about 29 mmH2o,
about 28
mmH2o or about 27.5 mmH2o. Alternatively or additionally, the mouthpiece
pressure
drop can be at least 10 mmH2o, preferably at least 15 mmH2o and more
preferably at
least 20 mmH2o. In some embodiments, the mouthpiece pressure drop can be
between
about 15 mmHg) and 40 mmH20. These values enable the mouthpiece 2 to slow down
the aerosol as it passes through the mouthpiece 2 such that the temperature of
the
aerosol has time to reduce before reaching the downstream end 2b of the
mouthpiece 2.
The mouthpiece 2, in the present example, includes a body of material 6
upstream of
the hollow tubular element 4, in this example adjacent to and in an abutting
relationship with the hollow tubular element 4. The body of material 6 and
hollow
tubular element 4 each define a substantially cylindrical overall outer shape
and share a
common longitudinal axis. The body of material 6 is wrapped in a first plug
wrap 7.
Preferably, the first plug wrap 7 has a basis weight of less than 50 gsm, more
preferably
between about 20 gsm and 40 gsm. Preferably, the first plug wrap 7 has a
thickness of
between 30 gm and 60 gm, more preferably between 35 gm and 45 gm. Preferably,
the
first plug wrap 7 is a non-porous plug wrap, for instance having a
permeability of less
than loo Coresta units, for instance less than 50 Coresta units. However, in
other
embodiments, the first plug wrap 7 can be a porous plug wrap, for instance
having a
permeability of greater than 200 Coresta Units.
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Preferably, the length of the body of material 6 is less than about 15 mm.
More
preferably, the length of the body of material 61s less than about 10 mm. In
addition, or
as an alternative, the length of the body of material 6 is at least about 5
mm.
Preferably, the length of the body of material 6 is at least about 6 mm. In
some
preferred embodiments, the length of the body of material 6 is from about 5 mm
to
about 15 mm, more preferably from about 6 mm to about 12 mm, even more
preferably
from about 6 mm to about 12 mm, most preferably about 6 mm, 7 mm, 8 mm, 9 mm
or
/o 10 mm. In the present example, the length of the body of material 6 is
10 mm.
In the present example, the body of material 6 is formed from filamentary tow.
In the
present example, the tow used in the body of material 6 has a denier per
filament
(d.p.f.) of 8.4 and a total denier of 21,000. Alternatively, the tow can, for
instance, have
a denier per filament (d.p.f.) of 9.5 and a total denier of 12,000. In the
present
example, the tow comprises plasticised cellulose acetate tow. The plasticiser
used in
the tow comprises about 7% by weight of the tow. In the present example, the
plasticiser is triacetin. In other examples, different materials can be used
to form the
body of material 6. For instance, rather than tow, the body 6 can be formed
from
paper, for instance in a similar way to paper filters known for use in
cigarettes.
Alternatively, the body 6 can be formed from tows other than cellulose
acetate, for
instance polylactic acid (PLA), other materials described herein for
filamentary tow or
similar materials. The tow is preferably formed from cellulose acetate. The
tow,
whether formed from cellulose acetate or other materials, preferably has a
d.p.f. of at
least 5, more preferably at least 6 and still more preferably at least 7.
These values of
denier per filament provide a tow which has relatively coarse, thick fibres
with a lower
surface area which result in a lower pressure drop across the mouthpiece 2
than tows
having lower d.p.f. values. Preferably, to achieve a sufficiently uniform body
of material
6, the tow has a denier per filament of no more than 12 d.p.f., preferably no
more than
11 d.p.f. and still more preferably no more than 10 d.p.f.
The total denier of the tow forming the body of material 6 is preferably at
most 30,000,
more preferably at most 28,000 and still more preferably at most 2.5,000.
These values
of total denier provide a tow which takes up a reduced proportion of the cross
sectional
area of the mouthpiece 2 which results in a lower pressure drop across the
mouthpiece
2 than tows having higher total denier values. For appropriate firmness of the
body of
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material 6, the tow preferably has a total denier of at least 8,000 and more
preferably at
least 10,000. Preferably, the denier per filament is between 5 and 12 while
the total
denier is between 10,000 and 25,000. More preferably, the denier per filament
is
between 6 and 10 while the total denier is between 11,000 and 22,000.
Preferably the
cross-sectional shape of the filaments of tow are 'Y' shaped, although in
other
embodiments other shapes such as 'X' shaped filaments can be used, with the
same
d.p.f. and total denier values as provided herein.
In the present example the hollow tubular element 4 is a first hollow tubular
element 4
/o and the mouthpiece includes a second hollow tubular element 8, also
referred to as a
cooling element, upstream of the first hollow tubular element 4. In the
present
example, the second hollow tubular element 8 is upstream of, adjacent to and
in an
abutting relationship with the body of material 6. The body of material 6 and
second
hollow tubular element 8 each define a substantially cylindrical overall outer
shape and
/5 share a common longitudinal axis. The second hollow tubular element 8 is
formed
from a plurality of layers of paper which are parallel wound, with butted
seams, to form
the tubular element 8. In the present example, first and second paper layers
are
provided in a two-ply tube, although in other examples 3,4 or more paper
layers can be
used forming 3,4 or more ply tubes. Other constructions can be used, such as
spirally
20 wound layers of paper, cardboard tubes, tubes formed using a papier-
mâché type
process, moulded or extruded plastic tubes or similar. The second hollow
tubular
element 8 can also be formed using a stiff plug wrap and/or tipping paper as
the second
plug wrap 9 and/or tipping paper 5 described herein, meaning that a separate
tubular
element is not required. The stiff plug wrap and/or tipping paper is
manufactured to
25 .. have a rigidity that is sufficient to withstand the axial compressive
forces and bending
moments that might arise during manufacture and whilst the article I is in
use. For
instance, the stiff plug wrap and/or tipping paper can have a basis weight
between 70
gsm and 120 gsm, more preferably between 80 gsm and 110 gsm. Additionally or
alternatively, the stiff plug wrap and/or tipping paper can have a thickness
between 8o
30 gm and 200 pm, more preferably between loo pm and 160 pm, or from 120
I.M1 to 150
M. It can be desirable for both the second plug wrap 9 and tipping paper 5 to
have
values in these ranges, to achieve an acceptable overall level of rigidity for
the second
hollow tubular element 8.
35 The second hollow tubular element 8 preferably has a wall thickness,
which can be
measured in the same way as that of the first hollow tubular element 4, of at
least about
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100 gm and up to about 1.5mm, preferably between loo gm and 1 mm and more
preferably between 150 gm and 500 gm, or about 300 gm. In the present example,
the
second hollow tubular element 8 has a wall thickness of about 290 gm.
Preferably, the length of the second hollow tubular element 8 is less than
about 50 mm.
More preferably, the length of the second hollow tubular element 8 is less
than about
40 mm. Still more preferably, the length of the second hollow tubular element
8 is less
than about 30 mm. In addition, or as an alternative, the length of the second
hollow
tubular element 8 is preferably at least about in mm. Preferably, the length
of the
.ro second hollow tubular element 8 is at least about 15 mm. In some
preferred
embodiments, the length of the second hollow tubular element 8 is from about
20 ITEM
to about 30 mm, more preferably from about 22 mm to about 28 mm, even more
preferably from about 24 to about 26 mm, most preferably about 25 mm. In the
present
example, the length of the second hollow tubular element 81s 25 MM.
/5
The second hollow tubular element 8 is located around and defines an air gap
within
the mouthpiece 2 which acts as a cooling segment. The air gap provides a
chamber
through which heated volatilised components generated by the aerosol
generating
material 3 flow. The second hollow tubular element 8 is hollow to provide a
chamber
20 for aerosol accumulation yet rigid enough to withstand axial compressive
forces and
bending moments that might arise during manufacture and whilst the article 1
is in use.
The second hollow tubular element 8 provides a physical displacement between
the
aerosol generating material 3 and the body of material 6. The physical
displacement
provided by the second hollow tubular element 8 will provide a thermal
gradient across
25 the length of the second hollow tubular element 8.
Preferably, the mouthpiece 2 comprises a cavity having an internal volume
greater than
450 mm. Providing a cavity of at least this volume has been found to enable
the
formation of an improved aerosol. Such a cavity size provides sufficient space
within
30 the mouthpiece 2 to allow heated volatilised components to cool,
therefore allowing the
exposure of the aerosol generating material 3 to higher temperatures than
would
otherwise be possible, since they may result in an aerosol which is too warm.
In the
present example, the cavity is formed by the second hollow tubular element 8,
but in
alternative arrangements it could be formed within a different part of the
mouthpiece 2.
35 More preferably, the mouthpiece 2 comprises a cavity, for instance
formed within the
second hollow tubular element 8, having an internal volume greater than 500
rrnn3, and
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still more preferably greater than 550 mm3, allowing further improvement of
the
aerosol. In some examples, the internal cavity comprises a volume of between
about
550 mm3 and about mo mm3, for instance about 600 mm3 or 700 mm3.
The second hollow tubular element 8 can be configured to provide a temperature
differential of at least 40 degrees Celsius between a heated volatilised
component
entering a first, upstream end of the second hollow tubular element 8 and a
heated
volatilised component exiting a second, downstream end of the second hollow
tubular
element 8. The second hollow tubular element 81s preferably configured to
provide a
temperature differential of at least 6o degrees Celsius, preferably at least
8o degrees
Celsius and more preferably at least roo degrees Celsius between a heated
volatilised
component entering a first, upstream end of the second hollow tubular element
8 and a
heated volatilised component exiting a second, downstream end of the second
hollow
tubular element 8. This temperature differential across the length of the
second hollow
tubular element 8 protects the temperature sensitive body of material 6 from
the high
temperatures of the aerosol generating material 3 when it is heated.
In alternative articles, the second hollow tubular element 8 can be replaced
with an
alternative cooling element, for instance an element formed from a body of
material
which allows aerosol to pass through it longitudinally, and which also
performs the
function of cooling the aerosol.
In the present example, the first hollow tubular element 4, body of material 6
and
second hollow tubular element 8 are combined using a second plug wrap 9 which
is
wrapped around all three sections. Preferably, the second plug wrap 9 has a
basis
weight of less than 50 gsm, more preferably between about 20 gsm and 45 gsm.
Preferably, the second plug wrap 9 has a thickness of between 30 pm and 60 gm,
more
preferably between 35 pm and 45 pm. The second plug wrap 9i5 preferably a non-
porous plug wrap having a permeability of less than loo Coresta Units, for
instance less
than 50 Coresta Units. However, in alternative embodiments, the second plug
wrap 9
can be a porous plug wrap, for instance having a permeability of greater than
200
Coresta Units.
In the present example, the aerosol generating material 3 is wrapped in a
wrapper 10.
The wrapper 10 can, for instance, be a paper or paper-backed foil wrapper. In
the
present example, the wrapper 10 is substantially impermeable to air. In
alternative
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embodiments, the wrapper 10 preferably has a permeability of less than loo
Coresta
Units, more preferably less than 60 Coresta Units. It has been found that low
permeability wrappers, for instance having a permeability of less than loo
Coresta
Units, more preferably less than 60 Coresta Units, result in an improvement in
the
aerosol formation in the aerosol generating material 3. Without wishing to be
bound by
theory, it is hypothesised that this is due to reduced loss of aerosol
compounds through
the wrapper 10. The permeability of the wrapper 10 can be measured in
accordance
with ISO 2965:2009 concerning the determination of air permeability for
materials
used as cigarette papers, filter plug wrap and filter joining paper.
In the present embodiment, the wrapper 10 comprises aluminium foil. Aluminium
foil
has been found to be particularly effective at enhancing the formation of
aerosol within
the aerosol generating material 3. In the present example, the aluminium foil
has a
metal layer having a thickness of about 6 um. In the present example, the
aluminium
foil has a paper backing. However, in alternative arrangements, the aluminium
foil can
be other thicknesses, for instance between 4 pm and 16 pm in thickness. The
aluminium foil also need not have a paper backing, but could have a backing
formed
from other materials, for instance to help provide an appropriate tensile
strength to the
foil, or it could have no backing material. Metallic layers or foils other
than aluminium
can also be used. The total thickness of the wrapper is preferably between 20
gm and
6o pm, more preferably between 30 gm and 50 pm, which can provide a wrapper
having appropriate structural integrity and heat transfer characteristics. The
tensile
force which can be applied to the wrapper before it breaks can be greater than
3,000
grams force, for instance between 3,000 and 10,000 grams force or between
3,000 and
4,500 grams force.
The article has a ventilation level of about 75% of the aerosol drawn through
the article.
In alternative embodiments, the article can have a ventilation level of
between so% and
80% of aerosol drawn through the article, for instance between 65% and 75%.
Ventilation at these levels helps to slow down the flow of aerosol drawn
through the
mouthpiece 2 and thereby enable the aerosol to cool sufficiently before it
reaches the
downstream end 2b of the mouthpiece 2. The ventilation is provided directly
into the
mouthpiece 2 of the article 1. In the present example, the ventilation is
provided into
the second hollow tubular element 8, which has been found to be particularly
beneficial
in assisting with the aerosol generation process. The ventilation is provided
via first
and second parallel rows of perforations 12, in the present case formed as
laser
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perforations, at positions 17.925 mm and 18.625 mm respectively from the
downstream, mouth-end 2b of the mouthpiece 2. These perforations pass though
the
tipping paper 5, second plug wrap 9 and second hollow tubular element 8. In
alternative embodiments, the ventilation can be provided into the mouthpiece
at other
locations, for instance into the body of material 6 or first tubular element
4.
In the present example, the aerosol forming material added to the aerosol
generating
substrate 3 comprises 14% by weight of the aerosol generating substrate 3.
Preferably,
the aerosol forming material comprises at least 5% by weight of the aerosol
generating
substrate, more preferably at least 10%. Preferably, the aerosol forming
material
comprises less than 25% by weight of the aerosol generating substrate, more
preferably
less than 20%, for instance between io% and 20%, between 12% and 18% or
between
13% and 16%.
Preferably the aerosol generating material 3 is provided as a cylindrical rod
of aerosol
generating material. Irrespective of the form of the aerosol generating
material, it
preferably has a length of about 10 mm to loo mm. In some embodiments, the
length
of the aerosol generating material is preferably in the range about 25 mm to
so mm,
more preferably in the range about 30 mm to 45 mm, and still more preferably
about
30 Mtn to 40 mm.
The volume of aerosol generating material 3 provided can vary from about 200
MM3to
about 4300 mm3, preferably from about 500 mm to 1500 mm3, more preferably from
about moo mm to about 1300 mm3. The provision of these volumes of aerosol
generating material, for instance from about woo mm3 to about 13o0 mm3, has
been
advantageously shown to achieve a superior aerosol, having a greater
visibility and
sensory performance compared to that achieved with volumes selected from the
lower
end of the range.
The mass of aerosol generating material 3 provided can be greater than 200 mg,
for
instance from about 200 mg to 400 mg, preferably from about 230 mg to 360 mg,
more
preferably from about 250 mg to 360 mg. It has been advantageously found that
providing a higher mass of aerosol generating material results in improved
sensory
performance compared to aerosol generated from a lower mass of tobacco
material.
Preferably the aerosol generating material or substrate is formed from tobacco
material
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as described herein, which includes a tobacco component.
Figure 5a is a side-on cross sectional view of a further article 1' including
a capsule-
containing mouthpiece 2'. Figure 5b is a cross sectional view of the capsule-
containing
mouthpiece shown in Figure 5a through the line A-A' thereof. Article 1' and
capsule-
containing mouthpiece 2' are the same as the article 1 and mouthpiece 2
illustrated in
Figure 4, except that an aerosol modifying agent is provided within the body
of material
6, in the present example in the form of a capsule ii, and that an oil-
resistant first plug
wrap 7' surrounds the body of material 6. In other examples, the aerosol
modifying
io agent can be provided in other forms, such as material injected into the
body of
material 6 or provided on a thread, for instance the thread carrying a
flavourant or
other aerosol modifying agent, which may also be disposed within the body of
material
6.
The capsule 11 can comprise a breakable capsule, for instance a capsule which
has a
solid, frangible shell surrounding a liquid payload. In the present example, a
single
capsule 11 is used. The capsule 11 is entirely embedded within the body of
material 6.
In other words, the capsule 11 is completely surrounded by the material
forming the
body 6. In other examples, a plurality of breakable capsules may be disposed
within the
zo body of material 6, for instance 2,3 or more breakable capsules. The
length of the body
of material 6 can be increased to accommodate the number of capsules required.
In
examples where a plurality of capsules is used, the individual capsules may be
the same
as each other, or may differ from one another in terms of size and/or capsule
payload.
In other examples, multiple bodies of material 6 may be provided, with each
body
containing one or more capsules.
The capsule ii has a core-shell structure. In other words, the capsule 1.1.
comprises a
shell encapsulating a liquid agent, for instance a flavourant or other agent,
which can be
any one of the flavourants or aerosol modifying agents described herein. The
shell of
the capsule can be ruptured by a user to release the flavourant or other agent
into the
body of material 6. The first plug wrap 7' can comprise a barrier coating to
make the
material of the plug wrap substantially impermeable to the liquid payload of
the
capsule ii. Alternatively or in addition, the second plug wrap 9 and/or
tipping paper 5
can comprise a barrier coating to make the material of that plug wrap and/or
tipping
paper substantially impermeable to the liquid payload of the capsule
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In the present example, the capsule 11 is spherical and has a diameter of
about 3 mm.
In other examples, other shapes and sizes of capsule can be used. The total
weight of
the capsule 11 may be in the range about ro mg to about so mg.
In the present example, the capsule 11 is located at a longitudinally central
position
within the body of material 6. That is, the capsule 11 is positioned so that
its centre is 4
mm from each end of the body of material 6. In other examples, the capsule 11
can be
located at a position other than a longitudinally central position in the body
of material
6, i.e. closer to the downstream end of the body of material 6 than the
upstream end, or
.ro closer to the upstream end of the body of material 6 than the
downstream end.
Preferably, the mouthpiece 2' is configured so that the capsule 11 and the
ventilation
holes 12 are longitudinally offset from each other in the mouthpiece 2'.
A cross section of the mouthpiece 2' is shown in Figure 5b, this being taken
through line
A-A' of Figure 5a. Figure 5b shows the capsule u, the body of material 6, the
first and
second plug wraps 7', 9 and the tipping paper 5. In the present example, the
capsule 11
is centred on the longitudinal axis (not shown) of the mouthpiece 2'. The
first and
second plug wraps 7', 9 and tipping 5 are arranged concentrically around the
body of
material 6.
The breakable capsule 11 has a core-shell structure. That is, the
encapsulating material
or barrier material creates a shell around a core that comprises the aerosol
modifying
agent. The shell structure hinders migration of the aerosol modifying agent
during
storage of the article 1' but allows controlled release of the aerosol
modifying agent, also
.. referred to as an aerosol modifier, during use.
In some cases, the barrier material (also referred to herein as the
encapsulating
material) is frangible. The capsule is crushed or otherwise fractured or
broken by the
user to release the encapsulated aerosol modifier. Typically, the capsule is
broken
immediately prior to heating being initiated but the user can select when to
release the
aerosol modifier. The term "breakable capsule" refers to a capsule, wherein
the shell
can be broken by means of a pressure to release the core; more specifically
the shell can
be ruptured under the pressure imposed by the user's fingers when the user
wants to
release the core of the capsule.
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In some cases, the barrier material is heat resistant. That is to say, in some
cases, the
barrier will not rupture, melt or otherwise fail at the temperature reached at
the capsule
site during operation of the aerosol provision device. Illustratively, a
capsule located in
a mouthpiece may be exposed to temperatures in the range of 30 C to 100 C for
example, and the barrier material may continue to retain the liquid core up to
at least
about 50 C to 120 C.
In other cases, the capsule releases the core composition on heating, for
example by
melting of the barrier material or by capsule swelling leading to rupture of
the barrier
material.
The total weight of a capsule may be in the range of about 1 mg to about 100
mg,
suitably about 5 mg to about 60 mg, about 8 mg to about 50 mg, about 10 mg to
about
mg, or about 12 mg to about 18 mg.
The total weight of the core formulation may be in the range of about 2 mg to
about 90
mg, suitably about 3 mg to about 70 mg, about 5 mg to about 25 mg, about 8 mg
to
about 20 mg, or about 10 mg to about 15 mg.
20 The capsule according to the invention comprises a core as described
above, and a shell.
The capsules may present a crush strength from about 4.5 N to about 40 N, more
preferably from about 5 N to about 30 N or to about 28 N (for instance about
9.8 N to
about 24.5 N). The capsule burst strength can be measured when the capsule is
removed from the body of material 6 and using a force gauge to measure the
force at
which the capsule bursts when pressed between two flat metal plates. A
suitable
measurement device is the Sauter FK 50 force gauge with a flat headed
attachment,
which can be used to crush the capsule against a flat, hard surface having a
surface
similar to the attachment.
The capsules may be substantially spherical and have a diameter of at least
about 0.4
mm, o.6 mm, 0.8 mm, 1.0 Min, 2.0 111111, 2.5 111111, 2.8 111111 Or 3.0 MM. The
diameter of
the capsules may be less than about 10.0 mm, 8.0 mm, 7.0 mm, 6.0 mm, 5.5 mm,
5.0
mm, 4.5 mm, 4.0 mm, 3.5 mm or 3.2 mm. Illustratively, the capsule diameter may
be in
the range of about 0.4 mm to about 10.0 mm, about 0.8 mm to about 6.0 mm,
about
2.5 Min to about 5.5 mm or about 2.8 mm to about 3.2 mm. In some cases, the
capsule
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may have a diameter of about 3.0 mm. These sizes are particularly suitable for
incorporation of the capsule into an article as described herein.
The cross-sectional area of the capsule 11 at its largest cross sectional area
is in some
embodiments less than 28% of the cross sectional area of the portion of the
mouthpiece
2' in which the capsule 11 is provided, more preferably less than 27% and
still more
preferably less than 25%. For instance, for the spherical capsule having a
diameter of
3.0 mm, the largest cross sectional area of the capsule is 7.07 mm2. For the
mouthpiece
2' having a circumference of 21 mm as described herein, the body of material 6
has an
.ro outer circumference of 20.8 mm, and the radius of this component will
be 3.31 mm,
corresponding to a cross sectional area of 34.43 mm2. The capsule cross
sectional area
is, in this example, 20.5% of the cross-sectional area of the mouthpiece 2'.
As another
example, if the capsule had a diameter of 3.2mm, its largest cross sectional
area would
be 8.04 mm2. In this case, the cross sectional area of the capsule would be
23.4% of the
cross sectional area of the body of material 6. A capsule with a largest cross
sectional
area less than 28% of the cross sectional area of the portion of the
mouthpiece 2' in
which the capsule 11 is provided has the advantage that the pressure drop
across the
mouthpiece 2' is reduced as compared to capsules with larger cross sectional
areas and
adequate space remains around the capsule for aerosol to pass without the body
of
material 6 removing significant amounts of the aerosol mass as it passes
through the
mouthpiece 2'.
Preferably the pressure drop or difference (also referred to a resistance to
draw) across
the article, measured as the open pressure drop (i.e. with the ventilation
openings
open), reduces by less than 8 mm1120 when the capsule is broken. More
preferably, the
open pressure drop reduces by less than 6 mmH20 and more preferably less than
5
mmH20. These values are measured as the average achieved by at least 80
articles
made to the same design. Such small changes in pressure drop mean that other
aspects
of the product design, such as setting the correct ventilation level for a
given product
pressure drop, can be achieved irrespective of whether or not the consumer
chooses to
break the capsule.
The barrier material may comprise one or more of a gelling agent, a bulking
agent, a
buffer, a colouring agent and a plasticiser.
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Suitably, the gelling agent maybe, for example, a polysaccharide or cellulosic
gelling
agent, a gelatin, a gum, a gel, a wax or a mixture thereof. Suitable
polysaccharides
include alginates, dextrans, maltodextrins, cyclodextrins and pectins.
Suitable alginates
include, for instance, a salt of alginic acid, an esterified alginate or
glycetyl alginate.
Salts of alginic acid include ammonium alginate, triethanolamine alginate, and
group I
or II metal ion alginates like sodium, potassium, calcium and magnesium
alginate.
Esterified alginates include propylene glycol alginate and glyceryl alginate.
In an
embodiment, the barrier material is sodium alginate and/ or calcium alginate.
Suitable
cellulosic materials include methyl cellulose, ethyl cellulose, hydroxyethyl
cellulose,
hydroxypropyl cellulose, carboxymethyl cellulose, cellulose acetate and
cellulose ethers.
The gelling agent may comprise one or more modified starches. The gelling
agent may
comprise carrageenans. Suitable gums include agar, gellan gum, gum Arabic,
pullul an
gum, mannan gum, gum ghatti, gum tragacanth, Karaya, locust bean, acacia gum,
guar,
quince seed and xanthan gums. Suitable gels include agar, agarose,
carrageenans,
furoidan and furcellaran. Suitable waxes include carnauba wax. In some cases,
the
gelling agent may comprise carrageenans and/or gellan gum; these gelling
agents are
particularly suitable for inclusion as the gelling agent as the pressure
required to break
the resulting capsules is particularly suitable.
The barrier material may comprise one or more bulking agents, such as
starches,
modified starches (such as oxidised starches) and sugar alcohols such as
maltitol.
The barrier material may comprise a colouring agent which renders easier the
location
of the capsule within the aerosol generating device during the manufacturing
process of
the aerosol generating device. The colouring agent is preferably chosen among
colorants and pigments.
The barrier material may further comprise at least one buffer, such as a
citrate or
phosphate compound.
The barrier material may further comprise at least one plasticiser, which may
be
glycerol, sorbitol, maltitol, triacetin, polyethylene glycol, propylene glycol
or another
polyalcohol with plasticising properties, and optionally one acid of the
monoacid, diacid
or triacid type, especially citric acid, fumaric acid, malic acid, and the
like. The amount
of plasticiser ranges from 1% to 30% by weight, preferably from 2% to 15% by
weight,
and even more preferably from 3 to 10% by weight of the total dry weight of
the shell.
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The barrier material may also comprise one or more filler materials. Suitable
filler
materials include comprising starch derivatives such as dextrin, maltodextrin,
cyclodextrin (alpha, beta or gamma), or cellulose derivatives such as
hydroxypropyl-
methylcellulose (HPMC), hydroxypropylcellulose (HPC), methylcellulose (MC),
carboxy-methylcellulose (CMC), polyvinyl alcohol, polyols or mixture thereof.
Dextrin
is a preferred filler. The amount of filler in the shell is at most 98.5%,
preferably from
25 to 95% more preferably from 40 to 80% and even more preferably from 50 to
60 %
by weight on the total dry weight of the shell.
/o The capsule shell may additionally comprise a hydrophobic outer layer
which reduces
the susceptibility of the capsule to moisture-induced degradation. The
hydrophobic
outer layer is suitably selected from the group comprising waxes, especially
carnauba
wax, candelilla wax or beeswax, carbowax, shellac (in alcoholic or aqueous
solution),
ethyl cellulose, hydroxypropyl methyl cellulose, hydroxyl- propylcellulose,
latex
composition, polyvinyl alcohol, or a combination thereof. More preferably, the
at least
one moisture barrier agent is ethyl cellulose or a mixture of ethyl cellulose
and shellac.
The capsule core comprises the aerosol modifier. This aerosol modifier may be
any
volatile substance which modifies at least one property of the aerosol. For
example, the
zo aerosol substance may modify the pH, the sensorial properties, the water
content, the
delivery characteristics or the flavour. In some cases, the aerosol modifier
may be
selected from an acid, a base, water or a flavourant In some embodiments, the
aerosol
modifier comprises one or more flavourants.
The flavourant may suitably be licorice, rose oil, vanilla, lemon oil, orange
oil, a mint-
flavour, suitably menthol and/or a mint oil from any species of the genus
Mentha such
as peppermint oil and/or spearmint oil, or lavender, fennel or anise.
In some cases, the flavourant comprises menthol.
In some cases, the capsule may comprise at least about 25% w/w flavourant
(based on
the total weight of the capsule), suitably at least about 30% w/w flavourant,
35% w/w
flavourant, 40% w/w flavourant, 45% w/w flavourant or 50% w/w flavourant.
In some cases, the core may comprise at least about 25% w/w flavourant (based
on the
total weight of the core), suitably at least about 30% w/w flavourant, 35% w/w
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flavourant, 40% w/w flavourant, 45% w/w flavourant or so% w/w flavourant. In
some
cases, the core may comprise less than or equal to about 75% w/w flavourant
(based on
the total weight of the core), suitably less than or equal to about 65% w/w
flavourant,
55% w/w flavourant, or 50% w/w flavourant. Illustratively, the capsule may
include an
.. amount of flavourant in the range of 25-75% w/w (based on the total weight
of the
core), about 35-60% w/w or about 40-55% w/w.
The capsules may include at least about 2 mg, 3 mg or 4 mg of the aerosol
modifier,
suitably at least about 4.5 mg of the aerosol modifier, 5 mg of the aerosol
modifier, 5.5
io of mg the aerosol modifier or 6 mg of the aerosol modifier.
In some cases, the consumable comprises at least about 7 mg of the aerosol
modifier,
suitably at least about 8 mg of the aerosol modifier, 10 mg of the aerosol
modifier, 12
mg of the aerosol modifier or 15 mg of the aerosol modifier. The core may also
comprise
a solvent which dissolves the aerosol modifier.
Any suitable solvent may be used.
Where the aerosol modifier comprises a flavourant, the solvent may suitably
comprise
short or medium chain fats and oils. For example, the solvent may comprise tri-
esters
of glycerol such as C2-C12 triglycerides, suitably C6-Cio triglycerides or Cs-
C12
triglycerides. For example, the solvent may comprise medium chain
triglycerides (MCT
- C8-C12), which may be derived from palm oil and/or coconut oil.
The esters may be formed with caprylic acid and/or capric acid. For example,
the
solvent may comprise medium chain triglycerides which are caprylic
triglycerides
and/or capric tryglycerides. For example, the solvent may comprise compounds
identified in the CAS registry by numbers 73398-61-5, 65381-09-1,85409-09-2.
Such
medium chain triglycerides are odourless and tasteless.
The hydrophilic-lipophilic balance (HLB) of the solvent may be in the range of
9 to 13,
suitably 10 to 12. Methods of making the capsules include co-extrusion,
optionally
followed by centrifugation and curing and/or drying. The contents of WO
2007/010407
A2 is incorporated by reference, in its entirety.
- 41 -
In the examples described above, the mouthpieces 2, 2' each comprise a single
body of
material 6. In other examples, either the mouthpiece of Figure 4 or of Figures
5a and
5b may include multiple bodies of material. The mouthpieces 2, 2' may comprise
a
cavity between the bodies of material.
In some examples, the mouthpiece 2, 2' downstream of the aerosol generating
material
3 can comprise a wrapper, for instance the first or second plug wraps 7, 9, or
tipping
paper 5, which comprises an aerosol modifying agent as described herein. The
aerosol
modifying agent may be disposed on an inwardly or outwardly facing surface of
the
io mouthpiece wrapper. For instance, the aerosol modifying agent may be
provided on an
area of the wrapper, such as an outwardly facing surface of the tipping paper
5, which
comes into contact with the consumer's lips during use. By disposing the
aerosol
modifying agent on the outwardly facing surface of the mouthpiece wrapper, the
aerosol modifying agent may be transferred to the consumer's lips during use.
Transfer
of the aerosol modifying agent to the consumer's lips during use of the
article may
modify the organoleptic properties (e.g. taste) of the aerosol generated by
the aerosol
generating substrate 3 or otherwise provide the consumer with an alternative
sensory
experience. For example, the aerosol modifying agent may impart flavour to the
aerosol generated by the aerosol generating substrate 3. The aerosol modifying
agent
may be at least partially soluble in water such that it is transferred to the
user via the
consumer's saliva. The aerosol modifying agent may be one that volatilises by
the heat
generated by the aerosol provision system. This may facilitate transfer of the
aerosol
modifying agent to the aerosol generated by the aerosol generating substrate
3.
A non-combustible aerosol provision device is used to heat the aerosol
generating
material 3 of the articles 1, 1' described herein. The non-combustible aerosol
provision
device preferably comprises a coil, since this has been found to enable
improved heat
transfer to the article 1, 1' as compared to other arrangements.
In some examples, the coil is configured to, in use, cause heating of at least
one
electrically-conductive heating element, so that heat energy is conductible
from the at
least one electrically-conductive heating element to the aerosol generating
material to
thereby cause heating of the aerosol generating material.
In some examples, the coil is configured to generate, in use, a varying
magnetic field for
penetrating at least one heating element, to thereby cause induction heating
and/or
Date Recue/Date Received 2023-02-21
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magnetic hysteresis heating of the at least one heating element. In such an
arrangement, the or each heating element may be termed a "susceptor" as
defined
herein. A coil that is configured to generate, in use, a varying magnetic
field for
penetrating at least one electrically-conductive heating element, to thereby
cause
induction heating of the at least one electrically-conductive heating element,
may be
termed an "induction coil" or "inductor coil".
The device may include the heating element(s), for example electrically-
conductive
heating element(s), and the heating element(s) may be suitably located or
locatable
.ro relative to the coil to enable such heating of the heating element(s).
The heating
element(s) may be in a fixed position relative to the coil. Alternatively, the
at least one
heating element, for example at least one electrically-conductive heating
element, may
be included in the article 1,1' for insertion into a heating zone of the
device, wherein the
article 1, also comprises the aerosol generating material 3 and is removable
from the
heating zone after use. Alternatively, both the device and such an article 1,
1' may
comprise at least one respective heating element, for example at least one
electrically-
conductive heating element, and the coil may be to cause heating of the
heating
element(s) of each of the device and the article when the article is in the
heating zone.
In some examples, the coil is helical. In some examples, the coil encircles at
least a part
of a heating zone of the device that is configured to receive aerosol
generating material.
In some examples, the coil is a helical coil that encircles at least a part of
the heating
zone.
In some examples, the device comprises an electrically-conductive heating
element that
at least partially surrounds the heating zone, and the coil is a helical coil
that encircles
at least a part of the electrically-conductive heating element. In some
examples, the
electrically-conductive heating element is tubular. In some examples, the coil
is an
inductor coil.
In some examples, the use of a coil enables the non-combustible aerosol
provision
device to reach operational temperature more quickly than a non-coil aerosol
provision
device. For instance, the non-combustible aerosol provision device including a
coil as
described above can reach an operational temperature such that a first puff
can be
provided in less than 30 seconds from initiation of a device heating program,
more
preferably in less than 25 seconds. In some examples, the device can reach an
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operational temperature in about 20 seconds from the initiation of a device
heating
program.
The use of a coil as described herein in the device to cause heating of the
aerosol
generating material has been found to enhance the aerosol which is produced.
For
instance, consumers have reported that the aerosol generated by a device
including a
coil such as that described herein is sensorially closer to that generated in
factory made
cigarette (FMC) products than the aerosol produced by other non-combustible
aerosol
provision systems. Without wishing to be bound by theory, it is hypothesised
that this
.ro is the result of the reduced time to reach the required heating
temperature when the
coil is used, the higher heating temperatures achievable when the coil is used
and/or
the fact that the coil enables such systems to simultaneously heat a
relatively large
volume of aerosol generating material, resulting in aerosol temperatures
resembling
FMC aerosol temperatures. In FMC products, the burning coal generates a hot
aerosol
which heats tobacco in the tobacco rod behind the coal, as the aerosol is
drawn through
the rod. This hot aerosol is understood to release flavour compounds from
tobacco in
the rod behind the burning coal. A device including a coil as described herein
is
thought to also be capable of heating aerosol generating material, such as
tobacco
material described herein, to release flavour compounds, resulting in an
aerosol which
.. has been reported to more closely resemble an FMC aerosol.
Using an aerosol provision system including a coil as described herein, for
instance an
induction coil which heats at least some of the aerosol generating material to
at least
200 C, more preferably at least 22o C, can enable the generation of an aerosol
from an
aerosol generating material that has particular characteristics which are
thought to
more closely resemble those of an FMC product. For example, when heating an
aerosol
generating material, including nicotine, using an induction heater, heated to
at least
250 C, for a two-second period, under an airflow of at least 1.5oL/m during
the period,
one or more of the following characteristics has been observed:
at least 10 lig of nicotine is aerosolised from the aerosol generating
material;
the weight ratio in the generated aerosol, of aerosol forming material to
nicotine
is at least about 2.5:1, suitably at least 8.5:1;
at least wo itig of the aerosol forming material can be aerosolised from the
aerosol generating material;
the mean particle or droplet size in the generated aerosol is less than about
1000 nm; and
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the aerosol density is at least 0.1 pg/cc.
In some cases, at least 10 fig of nicotine, suitably at least 30 lug or 40 pg
of nicotine, is
aerosolised from the aerosol generating material under an airflow of at least
1.501../m
during the period. In some cases, less than about 200 pg, suitably less than
about 150
fig or less than about 125 pg, of nicotine is aerosolised from the aerosol
generating
material under an airflow of at least 1.501./m during the period.
In some cases, the aerosol contains at least loo pg of the aerosol forming
material,
.ro suitably at least 200 pg, 500 pg or 1 mg of aerosol forming material is
aerosolised from
the aerosol generating material under an airflow of at least 1.50L/m during
the period.
Suitably, the aerosol forming material may comprise or consist of glycerol.
As defined herein, the term "mean particle or droplet size" refers to the mean
size of the
solid or liquid components of an aerosol (i.e. the components suspended in a
gas).
Where the aerosol contains suspended liquid droplets and suspended solid
particles,
the term refers to the mean size of all components together.
In some cases, the mean particle or droplet size in the generated aerosol may
be less
than about 900 nm, 800 nm, 700, nm 600 nm, 500nm, 45onm or 400 nm. In some
cases, the mean particle or droplet size may be more than about 25 nm, 50 nm
or
ioonm.
In some cases, the aerosol density generated during the period is at least 0.1
pg/cc. In
some cases, the aerosol density is at least 0.2 pg/cc, 0.3 pg/cc or 0.4 pg/cc.
In some
cases, the aerosol density is less than about 2.5 pg/cc, 2.0 pg/cc, 1.5 pg/cc
or 1.0 pg/cc.
The non-combustible aerosol provision device is preferably arranged to heat
the aerosol
generating material 3 of the article 1, 1', to a maximum temperature of at
least 160 C.
Preferably, the non-combustible aerosol provision device is arranged to heat
the aerosol
forming material 3 of the article 1,1', to a maximum temperature of at least
about
200 C, or at least about 220 C, or at least about 24o C, more preferably at
least about
270 C, at least once during the heating process followed by the non-
combustible
aerosol provision device.
Using an aerosol provision system including a coil as described herein, for
instance an
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induction coil which heats at least some of the aerosol generating material to
at least
200 C, more preferably at least 220 C, can enable the generation of an aerosol
from an
aerosol generating material in an article 1, 1' as described herein that has a
higher
temperature as the aerosol leaves the mouth end of the mouthpiece 2, 2' than
previous
devices, contributing to the generation of an aerosol which is considered
closer to an
FMC product. For instance, the maximum aerosol temperature measured at the
mouth-end of the article 1, 1' can preferably be greater than 50 C, more
preferably
greater than 55 C and still more preferably greater than 56 C or 57 C.
Additionally or
alternatively, the maximum aerosol temperature measured at the mouth-end of
the
/o article 1, 1' can be less than 62 C, more preferably less than 60 C and
more preferably
less than 59 C. In some embodiments, the maximum aerosol temperature measured
at
the mouth-end of the article 1, 1' can preferably be between 50 C and 62 C,
more
preferably between 56 C and 60 C.
Figure 6 shows an example of a non-combustible aerosol provision device loo
for
generating aerosol from an aerosol generating medium/material such as the
aerosol
generating material 3 of the articles 1, 1' described herein. In broad
outline, the device
100 may be used to heat a replaceable article no comprising the aerosol
generating
medium, for instance the articles 1, 1' described herein, to generate an
aerosol or other
inhalable medium which is inhaled by a user of the device 100. The device ioo
and
replaceable article no together form a system.
The device loo comprises a housing 102 (in the form of an outer cover) which
surrounds and houses various components of the device mo. The device 100 has
an
opening 104 in one end, through which the article no may be inserted for
heating by a
heating assembly. In use, the article no may be fully or partially inserted
into the
heating assembly where it may be heated by one or more components of the
heater
assembly.
The device 100 of this example comprises a first end member 106 which
comprises a lid
108 which is moveable relative to the first end member 106 to close the
opening 104
when no article no is in place. In Figure 6, the lid io8 is shown in an open
configuration, however the lid 108 may move into a closed configuration. For
example,
a user may cause the lid 108 to slide in the direction of arrow "B".
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The device loo may also include a user-operable control element 112, such as a
button
or switch, which operates the device loo when pressed. For example, a user may
turn
on the device loo by operating the switch 112.
The device loo may also comprise an electrical component, such as a
socket/port 114,
which can receive a cable to charge a battery of the device loo. For example,
the socket
114 may be a charging port, such as a USB charging port.
Figure 7 depicts the device wo of Figure 6 with the outer cover 102 removed
and
.ro without an article no present. The device loo defines a longitudinal
axis 134.
As shown in Figure 7, the first end member 106 is arranged at one end of the
device loo
and a second end member 116 is arranged at an opposite end of the device loo.
The first
and second end members 106, 116 together at least partially define end
surfaces of the
device loo. For example, the bottom surface of the second end member 116 at
least
partially defines a bottom surface of the device mo. Edges of the outer cover
102 may
also define a portion of the end surfaces. In this example, the lid 108 also
defines a
portion of a top surface of the device loo.
zo The end of the device closest to the opening 104 may be known as the
proximal end (or
mouth end) of the device loo because, in use, it is closest to the mouth of
the user. In
use, a user inserts an article no into the opening 104, operates the user
control 112 to
begin heating the aerosol generating material and draws on the aerosol
generated in the
device. This causes the aerosol to flow through the device 100 along a flow
path towards
the proximal end of the device loo.
The other end of the device furthest away from the opening 104 may be known as
the
distal end of the device loo because, in use, it is the end furthest away from
the mouth
of the user. As a user draws on the aerosol generated in the device, the
aerosol flows
away from the distal end of the device loo.
The device loo further comprises a power source 118. The power source n8 may
be, for
example, a battery, such as a rechargeable battery or a non-rechargeable
battery.
Examples of suitable batteries include, for example, a lithium battery (such
as a
.. lithium-ion battery), a nickel battery (such as a nickel¨cadmium battery),
and an
alkaline battery. The battery is electrically coupled to the heating assembly
to supply
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electrical power when required and under control of a controller (not shown)
to heat
the aerosol generating material. In this example, the battery is connected to
a central
support 120 which holds the battery 118 in place.
The device further comprises at least one electronics module 122. The
electronics
module 122 may comprise, for example, a printed circuit board (PCB). The PCB
122
may support at least one controller, such as a processor, and memory. The PCB
122
may also comprise one or more electrical tracks to electrically connect
together various
electronic components of the device loo. For example, the battery terminals
may be
io electrically connected to the PCB 122 so that power can be distributed
throughout the
device loco. The socket 114 may also be electrically coupled to the battery
via the
electrical tracks.
In the example device loo, the heating assembly is an inductive heating
assembly and
comprises various components to heat the aerosol generating material of the
article lio
via an inductive heating process. Induction heating is a process of heating an
electrically conducting object (such as a susceptor) by electromagnetic
induction. An
induction heating assembly may comprise an inductive element, for example, one
or
more inductor coils, and a device for passing a varying electric current, such
as an
zo alternating electric current, through the inductive element. The varying
electric current
in the inductive element produces a varying magnetic field. The varying
magnetic field
penetrates a susceptor suitably positioned with respect to the inductive
element, and
generates eddy currents inside the susceptor. The susceptor has electrical
resistance to
the eddy currents, and hence the flow of the eddy currents against this
resistance
causes the susceptor to be heated by Joule heating. In cases where the
susceptor
comprises ferromagnetic material such as iron, nickel or cobalt, heat may also
be
generated by magnetic hysteresis losses in the susceptor, i.e. by the varying
orientation
of magnetic dipoles in the magnetic material as a result of their alignment
with the
varying magnetic field. In inductive heating, as compared to heating by
conduction for
example, heat is generated inside the susceptor, allowing for rapid heating.
Further,
there need not be any physical contact between the inductive heater and the
susceptor,
allowing for enhanced freedom in construction and application.
The induction heating assembly of the example device loo comprises a susceptor
arrangement 132 (herein referred to as "a susceptor"), a first inductor coil
124 and a
second inductor coil 126. The first and second inductor coils 124,126 are made
from an
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electrically conducting material. In this example, the first and second
inductor coils
124, 126 are made from Litz wire/cable which is wound in a helical fashion to
provide
helical inductor coils 124, 126. Litz wire comprises a plurality of individual
wires which
are individually insulated and are twisted together to form a single wire.
Litz wires are
.. designed to reduce the skin effect losses in a conductor. In the example
device loo, the
first and second inductor coils 124,126 are made from copper Litz wire which
has a
rectangular cross section. In other examples the Litz wire can have other
shape cross
sections, such as circular.
/o The first inductor coil 124 is configured to generate a first varying
magnetic field for
heating a first section of the susceptor 132 and the second inductor coil 126
is
configured to generate a second varying magnetic field for heating a second
section of
the susceptor 132. In this example, the first inductor coil 124 is adjacent to
the second
inductor coil 126 in a direction along the longitudinal axis 134 of the device
loo (that is,
the first and second inductor coils 124,126 to not overlap). The susceptor
arrangement
132 may comprise a single susceptor, or two or more separate susceptors. Ends
13o of
the first and second inductor coils 124,126 can be connected to the PCB 122.
It will be appreciated that the first and second inductor coils 124, 126, in
some
zo examples, may have at least one characteristic different from each
other. For example,
the first inductor coil 124 may have at least one characteristic different
from the second
inductor coil 126. More specifically, in one example, the first inductor coil
124 may
have a different value of inductance than the second inductor coil 126. In
Figure 2, the
first and second inductor coils 124, 126 are of different lengths such that
the first
inductor coil 124 is wound over a smaller section of the susceptor 132 than
the second
inductor coil 126. Thus, the first inductor coil 124 may comprise a different
number of
turns than the second inductor coil 126 (assuming that the spacing between
individual
turns is substantially the same). In yet another example, the first inductor
coil 124 may
be made from a different material to the second inductor coil 126. In some
examples,
the first and second inductor coils 124,126 may be substantially identical.
In this example, the first inductor coil 124 and the second inductor coil 126
are wound
in opposite directions. This can be useful when the inductor coils are active
at different
times. For example, initially, the first inductor coil 124 may be operating to
heat a first
section/portion of the article no, and at a later time, the second inductor
coil 126 may
be operating to heat a second section/portion of the article no. Winding the
coils in
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opposite directions helps reduce the current induced in the inactive coil when
used in
conjunction with a particular type of control circuit. In Figure 7 the device
loo, the first
inductor coil 124 is a right-hand helix and the second inductor coil 126 is a
left-hand
helix. However, in another embodiment, the inductor coils 124, 126 may be
wound in
the same direction, or the first inductor coil 124 may be a left-hand helix
and the
second inductor coil 126 may be a right-hand helix.
The susceptor 132 of this example is hollow and therefore defines a receptacle
within
which aerosol generating material is received. For example, the article 110
can be
.ro inserted into the susceptor 132. In this example the susceptor 120 is
tubular, with a
circular cross section.
The susceptor 132 may be made from one or more materials. Preferably the
susceptor
132 comprises carbon steel having a coating of Nickel or Cobalt.
In some examples, the susceptor 132 may comprise at least two materials
capable of
being heated at two different frequencies for selective aerosolization of the
at least two
materials. For example, a first section of the susceptor 132 (which is heated
by the first
inductor coil 124) may comprise a first material, and a second section of the
susceptor
132 which is heated by the second inductor coil 126 may comprise a second,
different
material. In another example, the first section may comprise first and second
materials,
where the first and second materials can be heated differently based upon
operation of
the first inductor coil 124. The first and second materials may be adjacent
along an axis
defined by the susceptor 132, or may form different layers within the
susceptor 1.32.
Similarly, the second section may comprise third and fourth materials, where
the third
and fourth materials can be heated differently based upon operation of the
second
inductor coil 126. The third and fourth materials may be adjacent along an
axis defined
by the susceptor 132, or may form different layers within the susceptor 132.
Third
material may the same as the first material, and the fourth material may be
the same as
the second material, for example. Alternatively, each of the materials may be
different.
The susceptor may comprise carbon steel or aluminium for example.
The device loo of Figure 7 further comprises an insulating member 128 which
may be
generally tubular and at least partially surround the susceptor 132. The
insulating
member 128 may be constructed from any insulating material, such as plastic
for
example. In this particular example, the insulating member is constructed from
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polyether ether ketone (PEEK). The insulating member 128 may help insulate the
various components of the device loo from the heat generated in the susceptor
132.
The insulating member 128 can also fully or partially support the first and
second
inductor coils 124, 126. For example, as shown in Figure 7, the first and
second inductor
coils 124,126 are positioned around the insulating member 128 and are in
contact with
a radially outward surface of the insulating member 128. In some examples the
insulating member 128 does not abut the first and second inductor coils 124,
126. For
example, a small gap may be present between the outer surface of the
insulating
/o member 128 and the inner surface of the first and second inductor coils
124,126.
In a specific example, the susceptor 132, the insulating member 128, and the
first and
second inductor coils 124,126 are coaxial around a central longitudinal axis
of the
susceptor 132.
Figure 8 shows a side view of device ioo in partial cross-section. The outer
cover 102 is
present in this example. The rectangular cross-sectional shape of the first
and second
inductor coils 124, 126 is more clearly visible.
zo The device loo further comprises a support 136 which engages one end of
the susceptor
132 to hold the susceptor 132 in place. The support 136 is connected to the
second end
member 116.
The device may also comprise a second printed circuit board 138 associated
within the
control element 112.
The device ino further comprises a second lid/cap 140 and a spring 142,
arranged
towards the distal end of the device 100. The spring 142 allows the second lid
140 to be
opened, to provide access to the susceptor 132. A user may open the second lid
140 to
clean the susceptor 132 and/or the support 136.
The device Km further comprises an expansion chamber 144 which extends away
from
a proximal end of the susceptor 132 towards the opening 104 of the device.
Located at
least partially within the expansion chamber 144 is a retention clip 146 to
abut and hold
the article no when received within the device loo. The expansion chamber 144
is
connected to the end member 106.
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Figure 9 is an exploded view of the device loo of Figure 8, with the outer
cover 102
omitted.
Figure loA depicts a cross section of a portion of the device loo of Figure 8.
Figure loB
depicts a close-up of a region of Figure ioA. Figures IDA and loB show the
article no
received within the susceptor 132, where the article no is dimensioned so that
the
outer surface of the article no abuts the inner surface of the susceptor 132.
This
ensures that the heating is most efficient. The article no of this example
comprises
w aerosol generating material noa. The aerosol generating material noa is
positioned
within the susceptor 132. The article no may also comprise other components
such as a
filter, wrapping materials and/or a cooling structure.
Figure loB shows that the outer surface of the susceptor 132 is spaced apart
from the
/5 inner surface of the inductor coils 124, 126 by a distance i5o, measured
in a direction
perpendicular to a longitudinal axis 158 of the susceptor 132. In one
particular example,
the distance 15o is about 3mm to 4mm, about 3-3.5mm, or about 3.25 mm.
Figure loB further shows that the outer surface of the insulating member 128
is spaced
20 apart from the inner surface of the inductor coils 124, 126 by a
distance 152, measured
in a direction perpendicular to a longitudinal axis 158 of the susceptor 132.
In one
particular example, the distance 152 is about 0.05mm. In another example, the
distance
152 is substantially omm, such that the inductor coils 124, 126 abut and touch
the
insulating member 128.
In one example, the susceptor 132 has a wall thickness 154 of about 0.025mm to
imm,
or about 0.05mm.
In one example, the susceptor 132 has a length of about 4omm to 60mm, about
4omm
to 45mm, or about 44.5mm.
In one example, the insulating member 128 has a wall thickness 156 of about
0.25mm
to 2MM, 0.25MM to imm, or about o.5mm.
In use, the articles 1, 1' described herein can be inserted into a non-
combustible aerosol
provision device such as the device 100 described with reference to Figures 6
to 10. At
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least a portion of the mouthpiece 2,2' of the article 1, 1' protrudes from the
non-
combustible aerosol provision device wo and can be placed into a user's mouth.
An
aerosol is produced by heating the aerosol generating material 3 using the
device ioo.
The aerosol produced by the aerosol generating material 3 passes through the
mouthpiece 2 to the user's mouth.
The articles 1, 1' described herein have particular advantages, for instance
when used
with non-combustible aerosol provision devices such as the device 100
described with
reference to Figures 6 to 10. In particular, the first tubular element 4
formed from
/o filamentary tow has surprisingly been found to have a significant
influence on the
temperature of the outer surface of the mouthpiece 2, 2' of the articles 1,
1'. For
instance, where the hollow tubular element 4 formed from filamentary tow is
wrapped
in an outer wrapper, for instance the tipping paper 5, an outer surface of the
outer
wrapper has been found to reach a maximum temperature of less than 42 C during
use,
/5 suitably less than 40 C and more suitably less than 38 C or less than 36
C. .
The various embodiments described herein are presented only to assist in
understanding and teaching the claimed features. These embodiments are
provided as
a representative sample of embodiments only, and are not exhaustive and/or
exclusive.
zo It is to be understood that advantages, embodiments, examples,
functions, features,
structures, and/or other aspects described herein are not to be considered
limitations
on the scope of the invention as defined by the claims or limitations on
equivalents to
the claims, and that other embodiments may be utilised and modifications may
be
made without departing from the scope of the claimed invention. Various
embodiments
25 of the invention may suitably comprise, consist of, or consist
essentially of, appropriate
combinations of the disclosed elements, components, features, parts, steps,
means, etc,
other than those specifically described herein. In addition, this disclosure
may include
other inventions not presently claimed, but which may be claimed in future.
30 Examples
Experimental
Determination of Nicotine and Aerosol forming material Content
The quantities of nicotine and the aerosol forming material may be measured
using the
35 following method.
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An extraction solution may be made as follows. 2.5 0.01 g of n-heptadecane
is
weighed into a weighing vessel and added to a 5 L volumetric flask, containing
400-500
mL of methanol and the contents of the volumetric flask thoroughly mixed to
dissolve
the n-heptadecane. When dissolved, methanol is added to make up to the correct
volume of the volumetric flask and form the extraction solution.
The aerosol generating material (5 ¨ ic mm wide pieces) is stored in a sealed
plastic
bag or air tight container before analysis. The samples are mixed inside the
bags before
use, as to guarantee homogeneity.
1.0 g ( 0.01 g) of the sample is weighed into a 150-mL conical flask. 1.00 mL
of
deionised water from a calibrated pipette is added and the mixture left for 5
minutes.
50 mL of the extraction solution (see above) is added with a calibrated
dispenser. The
flask is stoppered and then set shaking on an Orbital/Horizontal shaker for 3
hours at
150 rpm.
Using a plastic 5 mL syringe, some of the extract is filtered through a 0.45
pm PVDF
filter into a 2 mL GC Vial.
The extract in the GC vial may then be analysed using GC (see below tables for
parameters) against working calibration solutions that have been previously
prepared.
The sample is injected into the injection port connected to the analytical
column. A
capillary GC column (phenomenex ZB-WAXplus (30 m x 0.53 mm id x 1.00 ttm)) and
a
flame ionisation detector (FID) may be used for the analysis.
Table 1¨ Column Parameters
Front - MNPH
Column 7B-WAXplus
m x 0.53 mm x 1.00 pm
Carrier Gas Helium
Pressure ipsi) 5.
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Table 2 ¨ Inlet/Injector Parameters
Front - MPH
Mode Splitless
Temperature (C) 270
Pressure (psi) 5..1
Split Ratio N/A
Spilt Flow (mtirnin) tstiA
Total Flow .(mUmin) 48
Injection Volume (DL) 1
Gas Saver On
Table 3 ¨ Detector Parameters
Front MNPH
Type RD
Temperature f; C) 270
H2 Flow/Ref. Flow 30
Air Flow (mUmin) 400
Make Up. Constant
Make Up He (mlimin) 15.0
OnfOff Flame On:
Negative Polarity NIA
Table 4 ¨ Oven Parameters
Initial Temperature 1120 qC
Initial Time 4 min
Ramp Rate 20 Imin
Final Temperature, 230 PC
Final Time 2.5 rain
la The final results of nicotine and aerosol forming material [CNH (%)
(dwh)] maybe
expressed as percent of dried sample, corrected by water content using the
below
equations. Water content may be determined by the Karl Fisher Method.
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( ANN
¨ INT) x risTD X V
'mg \ AISTD
CN El
g x m
mg'\ rin
CNH X _I. UV 100
C N (%)(dWb) g
I 00 C 1000 Iwater 010,
NH: Nicotine and/or Humectants (propylene glycol and glycerol) analytes
CNH (mg/g): Concentration of the Analyte expressed in mg/g
CNH (%) (dwb): Concentration of the Analyte expressed in % of dried sample
Dwb: dry weigh bases
CWater (%): Concentration of Water expressed in 96
ANH: Area of the analyte (nicotine, glycerol or propylene glycol)
AISTD: Area of the internal standard
INT: y-axis intercept of the linear regression
CISTD: concentration of internal standard in the extraction solution (mg/mL)
V: volume of extraction solution (mL) + Loo mL of deionised water
D: slope of the linear regression
m: mass of whole THP recon used for extraction (g)
The nicotine target % provided herein may be determined by analysing the
nicotine
content of a series of samples (e.g. 20-40 samples) and then taking an
average.
Determination of water content
In the compositions described herein, the % by weight refers to a dry weight
basis,
unless specifically indicated to the contrary. Thus, any water that may be
present in the
tobacco composition, or in any component thereof, is entirely disregarded for
the
purposes of the determination of the weight %. However, other liquid
components,
such as the aerosol forming material, are included in the weight %. The water
content of
the tobacco compositions described herein may vary and may be, for example,
from 5 to
15% by weight. The water content can be determined by Karl-Fisher analysis.
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Water content by Karl-Fisher analysis
Karl Fisher water analysis may be performed on a Mettler Toledo Karl Fisher
V3o
Volumetric Titrator. Prior to sample testing the background water content of
the
.. extraction solvent (methanol) is determined and the value recorded in the
analysis
method.
Approximately o.sg of material to be analysed is accurately weighed (4 decimal
places)
into awo mL conical flask and the weight recorded. 5omL of dry methanol is
dispensed
io .. into the conical flask which is then sealed and agitated on a flatbed
shaker (155rpm) for
30 minutes. Approximately 2mL of the sample extract is taken up in a syringe
and
injected into the titration apparatus (weight determined by back weighing of
syringe).
Results are reported as the % water content of the sample by weight. Samples
are
determined in triplicate and the averaged values reported along with the
standard
deviation.
Leaf Material
Nine blends consisting of leaf material were prepared. The amount of nicotine
in each
blend by weight of the blend can be determined. The results are shown in
Tables 5 and
sa:
30
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Table 5
Virginia Leaf Inclusion Inclusion Nicotine
(KG) (%) (%)
Virginia 400 lo% 2.57
Virginia 200 r
3.04
Virginia 200 r
3.52
800 20% 2.92
Oriental safe
Virginia 200 6.8% 2.57
Oriental 210 7.1% 0.95
Oriental 140 4.7% 1.24
550 18.6% 1.61
Dark .flue-cured (DFC) safe
Virginia 200 6.9% 2.57
Oriental 210 7.2% 0.95
Fired Cured 100 3-4% 3.04
510 17.5% 1-99
Dark flue-cured (DFC) stretch
Virginia 200 6.6% 2.57
Oriental 210 7.0% 0.95
Fired Cured 200 6.6% 3.04
610 20.3% 2.16
-Burley Leaf
-Burley 200 6.8% 2.95
Oriental 210 7.1% 0.95
Oriental 1.4.0 47%6 1-43
550 18.6% 1.80
Dark Air-Cured (DAC)
Virginia 200 6.6% 2.57
Oriental 210 7.0% 0.95
Dark Air Cured 210 7.0% 1.43
620 20.5% 1.63
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Table sa
Virginia Leaf A Inclusion Inclusion (%) Nicotine (%)
(KG)
Virginia 1 400 12.8 2.57
Virginia 2 200 6.4 2.57
Virginia 3 400 12.8 2.57
Virginia 4 200 6.4 3.04
1200 38.5 2.64
Burley Leaf A
Virginia 5 200 6.6 3.52
Burley 1 200 6.6 2.95
Burley 2 200 6.6 2.95
Oriental 1 210 7.0 0.95
Oriental 2 140 4-7 1.24
Oriental 3 140 4-7 1-43
1090 36.2 2.25
Virginia Leaf B
Virginial 400 13.0 2.09
Virginia 6 400 13.0 2.57
Virginia 2 200 6.5 2.57
Virginia 3 400 13.0 2.57
Virginia 4 400 13.0 3.04
1800 58-4 2.57
Comparative Examples
Six tobacco reconstituted tobacco materials (Recon. Tobacco 1-6) comprising
Low
Nicotine Reconstituted Tobacco (LNRT) and/or Medium Nicotine Reconstituted
Tobacco (MNRT) and/or High Nicotine Reconstituted Tobacco (HNRT) were prepared
and then analysed to ascertain their nicotine content. The results are shown
in Table 6
and Table 6a.
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Table 6
Components of Recon. Recon. Recon.
Reconstituted Tobacco Tobacco 1 Tobacco 2 Tobacco 3
Material
LNRT 77.0 38.4 0.0
MNRT 0.0 0.0 0.0
HNRT 0.0 38.4 76.5
Virginia leaf 0.0 0.0 0.0
Burley leaf 0.0 0.0 0.0
=
Oriental leaf 0.0 0.0 0.0
Tobacco total 77.0 76.8 76.5
Wood pulp 8.o 8.3 8.5
Glycerol in Recon 15.0 15.0 15.0
Glycerol added (%) 0.0 0.0 0.0
Grand total loo.o 100.0 100.0
Nicotine Target % 0.85 1.18 1.50
Glycerol added (%) 0.00 0.00 0.00
Cuts per inch (CPI) 22 22 22
Rod Net weight (mg) 260 260 260
It will be noted that the nicotine content of the reconstituted tobacco
materials was less
than or equal to 1.5% by weight.
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Table 6a
Components of Recon. Recon. Recon.
Reconstituted Tobacco Tobacco 4 Tobacco 5 Tobacco 6
Material
LNRT 77.0 0.0 0.0
MN RT 0.0 77.0 0.0
HNRT 0.0 0.0 76.5
Virginia leaf 0.0 0.0 0.0
Burley leaf 0.0 0.0 0.0
Oriental leaf 0.0 0.0 0.0
Tobacco total 77.0 77.0 76.5
Wood pulp 8.o 8.0 8.5
Glycerol in Recon 15.0 15.0 15.0
Glycerol added (%) 0.0 0.0 0.0
Grand total loo.o 100.0 100.0
Nicotine Target % 1.15 1.30 1.50
Glycerol added (%) 0.00 0.00 0.00
Cuts per inch (CPI) 32 32 32
Rod Net weight (mg)* 260 260 260
*rods having a net weight of 340 mg were also made
It will be noted that the nicotine content of the reconstituted tobacco
materials was less
than or equal to 1.5% by weight.
Examples 1-3
Three blends comprising leaf tobacco, Low Nicotine Reconstituted Tobacco
(LNRT)
/0 and/or Medium Nicotine Reconstituted Tobacco (MNRT) and/or High Nicotine
Reconstituted Tobacco (HNRT) were prepared and then analysed for their
nicotine
content. The results are shown in Table 7.
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Table 7
Components Blend I Blend 2 Blend 3
Virginia grade / LNRC 61.6 30.7 0.0
Virginia grade / MNRC 0.0 0.0 0.0
Virginia grade / HNRC 0.0 30.7 61.2
Virginia grade / Lamina 18.o 18.0 18.0
Burley grade 0.0 0.0 0.0
Oriental grade 0.0 0.0 0.0
Tobacco total 79.6 79.4 79.2
Wood pulp 6.4 6.6 6.8
Glycerol in Recon 12.0 12.0 12.0
Glycerol added (%) 2.0 2.0 2.0
Grand total 100.0 100.0 loom
Nicotine Target % 1.25 1.50 1.75
Cuts per Inch (CPI) 22 22 22
Rod Net weight (mg) 260 260 260
Examples 4-21
18 further blends comprising leaf tobacco and reconstituted tobacco material
were
prepared and then analysed for their nicotine content. The results are shown
in Tables
8,9, 9a, 9b and 9c.
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Table 8
Components of Blend Blend 5 Blend 6 Blend Blend
Recon 4 7 8
Virginia grade / 62.7 31.2 63.5 31.7 61.4
LNRC
Virginia grade / 0.0 0.0 0.0 0.0 0.0
MNRC
Virginia grade / 0.0 31.2 0.0 31.7 0.0
HNRC
Virginia grade / Leaf 6.1 6.1 6.2 6.2 6.0
Burley grade / Leaf 0.0 0.0 0.0 0.0 0.0
Oriental grade / Leaf 10.6 10.6 6.5 6.5 6.3
DAC grade / Leaf 0.0 0.0 0.0 0.0 0.0
DFC grade / Leaf 0.0 0.0 3.1 3.1 6.0
Tobacco total 79.4 79.2 79.3 79.1 79.6
Wood pulp 6.5 6.7 6.6 6.8 6.4
Glycerol in Recon 12.1 12.1 12.1 12.1 12.0
Glycerol added (%) 2.0 2.0 2.0 2.0 2.0
Grand total 100.0 100.0 100.0 loom 100.0
Nicotine Target % 1.00 1.25 1.05 1.30 1.15
Cuts per Inch (CPI) 22 22 22 22 22
Rod Net weight (mg)
260 260 260 260 260
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Table 9
Components of Blend 9 Blend Blend Blend Blend
Recon 10 11 12 13
Virginia grade / LNRC 30.6 62.7 31.2 61.2 30.5
Virginia grade / 0.0 0.0 0.0 0.0 0.0
MNRC
Virginia grade / HNRC 30.6 0.0 31.2 0.0 30.5
Virginia grade / Leaf 6.0 0.0 0.0 5.9 5.9
Burley grade / Leaf 0.0 6.1 6.1 0.0 0.0
Oriental grade / Leaf 6.3 10.7 10.7 6.2 6.2
DAC grade / Leaf 0.0 0.0 0.0 6.2 6.2
DFC grade / Leaf 6.o 0.0 0.0 0.0 0.0
Tobacco total 79.4 79.4 79.2 79.6 79.4
Wood pulp 6.6 6.5 6.7 6.4 6.6
Glycerol in Recon 12.0 12.1 12.1 12.0 12.0
Glycerol added (%) 2.0 2.0 2.0 2.0 2.0
Grand total 100.0 loom 100.0 100.0 100.0
Nicotine Target % 1.40 1.05 1.30 1.15 1.40
Cuts per Inch (CPI) 22 22 22 22 22
Rod Net weight (mg) 260 260 260 260 260
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Table 9a
Components of Recon Blend 14 Blend 15
Virginia grade / LNRC (%) 0.0 0.0
Virginia grade / MNRC (%) o.0 60.4
Virginia grade / HNRC (%) 6o.o 0.0
Virginia grade! Leaf (%) 19.5 19.6
Burley grade / Leaf (%) 0.0 0.0
Oriental grade / Leaf (%) 0.0 o.o
DAC grade / Leaf (%) 0.0 0.0
DFC grade / Leaf (%) 0.0 0.0
Tobacco total (%) 79.5 80.o
Wood pulp (%) 6.2 6.3
Glycerol in Recon (%) 11.7 11.8
Glycerol added (%) 2.0 2.0
Casings added (%) 0.6
Grand total (%) 100 100
Nicotine Target (%) 1.75 1.6o
Cuts per Inch (CPI) 22 32
Rod Net weight (mg)* 260 260
*rods having a net weight of 340 mg were also made
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Table 9b
Components of Recon Blend 16 Blend 17 Blend i8
Virginia grade / LNRC (%) 0.0 44.1 0.0
'-Virginia grade / MNRC (%) 0.0 0.0 44.1
i
Virginia grade / HNRC (%) 44.2 0.0 0.0
Virginia grade / Leaf A (%) 36.1 36.0 36.0
Burley grade / Leaf A (%) 0.0 0.0 0.0
Oriental grade / Leaf (%) 0.0 o.o o.o
DAC grade ,/ Leaf (%) 0.0 0.0 0.0
DFC grade / Leaf (%) 0.0 0.0 0.0
Tobacco total (%) 80.3 80.1 80.i
Wood pulp (%) 4.9 4.9 4.9
,
Glycerol in Recon (9-6) 8.7 8.6 8.6 '
Glycerol added (%) 5.6 5.6 5.6
Casings added (%) 0.5 0.8 0.8
Grand total (%) 100 100 100
Nicotine Target (%) 1.80 1.6o 1.15
Cuts per inch (CPI) 32 22 32
Rod Net weight (mg)* ' 260 260 ' 260
1
*rods having a net weight of 340 mg were also made
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Table 9c
Components of Re con Blend 19 Blend 20 Blend 21
Virginia grade / LNRC (%) 0.0 0.0 29.2
--Virginia grade / MNRC (%) 0.0 29.2 0.0
Virginia grade / HNRC (%) 29.2 0.0 0.0
Virginia grade / Leaf B (%) 53.7 53.7 53.7
Burley grade / Leaf (%) 0.0 0.0 0.0
Oriental grade / Leaf (%) 0.0 0.0 0.0
DAC grade / Leaf (%) 0.0 0.0 0.0
DFC grade / Leaf (%) 0.0 0.0 0.0
Tobacco total (%) 82.9 82.9 82.9
Wood pulp (%) 3.2 3.2 3.2
Glycerol in Recon (%) 5.7 5.7 5.7
Glycerol added (%) 7.4 7.4 7.4
Casings added (%) 0.8 0.8 0.8
Grand total (%) 100 100 100
Nicotine Target (%) 1.95 1.85 1.75
Cuts per Inch (CPI) 32 32 32
Rod Net weight (mg)* 260 260 260
*rods having a net weight of 340 nig were also made
The results show that the nicotine content of tobacco compositions can be
tailored by
combining the reconstituted tobacco material with leaf tobacco having a
nicotine
content of greater than about 1.5% by weight of the leaf tobacco. Thus, a
variety of
tobacco compositions having a broad range of nicotine concentrations can be
manufactured.
xo Table 10 below shows the temperature of the outer surface of the article
1 as described
with reference to Figure 4 herein when heated using the device 100 described
with
reference to Figures 6 to toB herein. First, second and third temperature
measuring
probes were used as corresponding first, second and third positions along the
mouthpiece 2 of the article 1. The first position (numbered as position 1 in
Table 10)
was at 4mm from the downstream end 2b of the mouthpiece 2, the second position
(numbered as position 2 in Table 10) was at 8rnm from the downstream end 2b of
the
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mouthpiece 2, and the third position (numbered as position 3 in Table 10) was
at 12MM
from the downstream end 2b of the mouthpiece 2.
The first position was therefore on the outer surface of the part of the
mouthpiece 2 in
which the first tubular element 4 is disposed, while the second and third
positions were
on the outer surface of the part of the mouthpiece 2 in which the body of
material 6 is
disposed.
A control article was tested for comparison with the filamentary tow tubular
elements 4
described herein, and used instead of the filamentary tow tubular element 4 a
known
spirally wrapped paper tube having the same construction as the second hollow
tubular
element 8 described herein, but a length of 6mm rather than 5mm.
Testing was performed for the first 5 puffs on the article, since by the 5th
puff
temperatures have generally peaked and are starting to fall, so that an
approximate
maximum temperature can be observed. Each sample was tested 5 times, and the
temperatures provided are an average of these 5 tests. The known Health Canada
Intense puffing regime was applied (55 ml puff volume applied for 2 seconds
duration
every 30 seconds) using standard testing equipment.
As shown in the table below, surprisingly, it was found that the use of a
tubular element
4 formed from filamentary tow reduced the outer surface temperature of the
mouthpiece 2 as compared to the control article in every puff and at every
testing
position on the mouthpiece 2. The tubular element 4 formed from filamentary
tow was
particular effective at reducing the temperature at the first probe position,
where
consumer's lips will be positioned when using the article 1. In particular,
the
temperature of the outer surface of the mouthpiece 2 at the first probe
position was
reduced by more than 7 C in the first three puffs and by more than 5 C in the
fourth
and fifth puffs.
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Table 10
Probe Pos. Consumable Puff i Puff 2 Puff 3 Puff 4 Puff 5
Mouth End
Paper Tube 38.98 42.50 43.26 42.38 40.52
(control)
Tow tubular 31.79 35.00 35.72 35.46 34.64
element 4
2 Paper Tube 41.60 45.34 47.05 46.36 44.58
(control)
Tow Tubular 40.32 43.48 43.73 43-21 41.73
element 4
3 Paper Tube 46.71 48-93 50.51 53.14 54-63
(control)
Tow Tubular 45.43 47-73 47.64 47-72 47.36
element 4
Figure 11 illustrates a method of manufacturing an article for use in a non-
combustible
aerosol provision system. At step Sim, first and second portions of aerosol
generating
material, each comprising an aerosol forming material, are positioned adjacent
to
respective first and second longitudinal ends of a mouthpiece rod, the
mouthpiece rod
comprising a hollow tubular element rod formed from filamentary tow disposed
between the first and second ends. In the present example, the hollow tubular
element
rod comprises a double length first hollow tubular element 4 arranged between
first
io and second respective bodies of material 6. At the outer end of each
body of material 6
is positioned a respective second tubular element 8 and it is adjacent to the
outer ends
of these second tubular elements 8 that the first and second portions of
aerosol
generating material are positioned. The mouthpiece rod is wrapped in the
second plug
wrap described herein.
At step S102, the first and second portions of aerosol generating material are
connected
to the mouthpiece rod. In the present example, this is performed by wrapping a
tipping
papers as described herein around the mouthpiece rod and at least part of each
of the
portions of aerosol generating material 3. In the present example, the tipping
paper 5
extends about 5mm longitudinally over the outer surface of each of the
portioned of
aerosol generating material 3.
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At step S1o3, the hollow tubular element rod is cut to form first and second
articles,
each article comprising a mouthpiece comprising a portion of the hollow
tubular
element rod at the downstream end of the mouthpiece. In the present example,
double
length first hollow tubular element 4 of the mouthpiece rod is cut at a
position about
half-way along its length, so as to form first and second substantially
identical articles.
The various embodiments described herein are presented only to assist in
understanding and teaching the claimed features. These embodiments are
provided as
a representative sample of embodiments only, and are not exhaustive and/or
exclusive.
It is to be understood that advantages, embodiments, examples, functions,
features,
structures, and/or other aspects described herein are not to be considered
limitations
on the scope of the invention as defined by the claims or limitations on
equivalents to
the claims, and that other embodiments may be utilised and modifications may
be
made without departing from the scope of the claimed invention. Various
embodiments
.. of the invention may suitably comprise, consist of, or consist essentially
of, appropriate
combinations of the disclosed elements, components, features, parts, steps,
means, etc,
other than those specifically described herein. In addition, this disclosure
may include
other inventions not presently claimed, but which may be claimed in future.
