Note : Les descriptions sont présentées dans la langue officielle dans laquelle elles ont été soumises.
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AEROSOL PROVISION DEVICE
TECHNICAL FIELD
The present disclosure relates to an aerosol provision device, an aerosol
generating system and a method of generating an aerosol.
BACKGROUND
Articles such as cigarettes, cigars and the like burn tobacco during use to
create
tobacco smoke. Attempts have been made to provide alternatives to these types
of
articles, which burn tobacco, by creating products that release compounds
without
burning. Apparatus is known that heats smokable material to volatilise at
least one
component of the smokable material, typically to form an aerosol which can be
inhaled,
without burning or combusting the smokable material. Such apparatus is
sometimes
described as a "heat-not-burn" apparatus or a "tobacco heating product" (THP)
or
"tobacco heating device" or similar. Various different arrangements for
volatilising at least
one component of the smokable material are known.
The material may be for example tobacco or other non-tobacco products or a
combination, such as a blended mix, which may or may not contain nicotine.
It is desired to provide an improved aerosol provision device.
SUMMARY
According to an aspect there is provided an aerosol provision device for
generating aerosol from aerosol generating material, wherein the aerosol
provision
device comprises:
one or more external aerosol generators arranged to cause aerosol to be
generated from the aerosol generating material;
one or more internal aerosol generators arranged to cause aerosol to be
generated from the aerosol generating material; and
a controller for controlling the one or more one or more external and internal
aerosol generators;
wherein the controller is operable in a first mode of operation to activate
the one
or more external aerosol generators without activating the one or more
internal aerosol
generators during a session of use; and
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wherein the controller is operable in a second mode of operation to activate
the
one or more internal aerosol generators without activating the one or more
external
aerosol generators during a session of use.
In the first mode of operation the controller may be arranged to set a first
heating
profile having a first duration for the one or more external aerosol
generators; and
in the second mode of operation the controller may be arranged to set a second
heating profile having a second duration for the one or more internal aerosol
generators.
According to an embodiment the first and second heating profiles are the same.
Alternatively, the first and second heating profiles may be different.
According to an embodiment the first and second durations are the same.
Alternatively, the first and second durations are different.
According to another aspect there is provided an aerosol provision device for
generating aerosol from aerosol generating material, wherein the aerosol
provision
device comprises:
one or more external aerosol generators arranged to cause aerosol to be
generated from the aerosol generating material;
one or more internal aerosol generators arranged to cause aerosol to be
generated from the aerosol generating material; and
a controller for controlling the one or more one or more external and internal
aerosol generators;
wherein the controller is operable in a mode of operation either: (i) to
activate the
one or more external aerosol generators initially without activating the one
or more
internal aerosol generators and then to activate the one or more internal
aerosol
generators without activating the one or more external aerosol generators
during a
session of use; or (ii) to activate the one or more internal aerosol
generators initially
without activating the one or more external aerosol generators and then to
activate the
one or more external aerosol generators without activating the one or more
internal
aerosol generators during a session of use.
The one or more external aerosol generators may comprise one or more
induction aerosol generators.
The one or more external aerosol generators may comprise one or more resistive
or non-induction aerosol generators.
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The one or more internal aerosol generators may comprise one or more induction
aerosol generators.
The one or more internal aerosol generators may comprise one or more resistive
or non-induction aerosol generators.
The one or more external aerosol generators may comprise a first external
heating unit and a second external heating unit.
The one or more internal aerosol generators may comprise a first internal
heating
unit and a second internal heating unit.
According to an aspect there is provided an aerosol provision device for
generating aerosol from aerosol generating material, wherein the aerosol
provision
device comprises:
one or more induction aerosol generators arranged to cause aerosol to be
generated from the aerosol generating material;
one or more resistive or non-induction aerosol generators arranged to cause
aerosol to be generated from the aerosol generating material; and
a controller for controlling the one or more induction and resistive or non-
induction aerosol generators;
wherein the controller is operable in a first mode of operation to activate
one or
more induction aerosol generators without activating the one or more resistive
or non-
induction aerosol generators during a session of use; and
wherein the controller is operable in a second mode of operation to activate
the
one or more resistive or non-induction aerosol generators without activating
one or more
induction aerosol generators during a session of use.
According to an embodiment the first mode of operation the controller sets a
first
heating profile having a first duration for one or more induction aerosol
generators; and
in the second mode of operation the controller sets a second heating profile
having a second duration for the one or more resistive or non-induction
aerosol
generators.
The first and second heating profiles may be the same. Alternatively, the
first and
second heating profiles may be different.
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The first and second durations may be the same. Alternatively, the first and
second durations may be different.
According to another aspect there is provided an aerosol provision device for
generating aerosol from aerosol generating material, wherein the aerosol
provision
device comprises:
one or more induction aerosol generators arranged to cause aerosol to be
generated from the aerosol generating material;
one or more resistive or non-induction aerosol generators arranged to cause
aerosol to be generated from the aerosol generating material; and
a controller for controlling the one or more induction and resistive or non-
induction aerosol generators;
wherein the controller is operable in a mode of operation either: (i) to
activate one
or more induction aerosol generators initially without activating the one or
more resistive
or non-induction aerosol generators and then to activate the one or more
resistive or
non-induction aerosol generators without activating one or more induction
aerosol
generators during a session of use; or (ii) to activate the one or more
resistive or non-
induction aerosol generators initially without activating one or more
induction aerosol
generators and then to activate one or more induction aerosol generators
without
activating the one or more resistive or non-induction aerosol generators
during a session
of use.
The one or more induction aerosol generators may comprise one or more
external aerosol generators.
The one or more induction aerosol generators may comprise one or more internal
aerosol generators.
The one or more resistive or non-induction aerosol generators may comprise one
or more external aerosol generators.
The one or more resistive or non-induction aerosol generators may comprise one
or more internal aerosol generators.
The one or more induction aerosol generators may comprise a first induction
heating unit and a second induction heating unit.
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The one or more resistive or non-induction aerosol generators may comprise a
first resistive or non-induction heating unit and a second resistive or non-
induction
heating unit.
The aerosol provision device may further comprise a user interface arranged to
detect an input from a user, wherein the user interface is arranged to select
the mode of
operation of the controller.
The aerosol provision device may further comprise a first device for
automatically
recognising an aerosol generating article inserted into the aerosol provision
device,
wherein the first device is arranged to select the mode of operation of the
controller.
A session of use may be determined to begin when power or energy is first
supplied to the one or more aerosol generators after an aerosol generating
article has
been inserted into the aerosol provision device.
A session of use may be determined to begin when power or energy is first
supplied to the one or more aerosol generators in order to raise the
temperature of the
one or more aerosol generators to an operating temperature Tmin such that a
user can
take a first puff of aerosol generated from the aerosol generating material.
According to
an embodiment Tmin is in the range: (i) 200-210 C; (ii) 210-220 C; (iii) 220-
230 C; (iv)
230-240 C; (v) 240-250 C; (vi) 250-260 C; (vii) 260-270 C; (viii) 270-280
C; (ix) 280-
290 C; and (x) 290-300 C.
A session of use may be determined to end when power or energy is no longer
supplied to the one or more aerosol generators .
A session of use may be determined to end when the aerosol generating material
is substantially spent or wherein a user is unable to take further puffs of
aerosol
generated from the aerosol generating material.
A session of use may be determined to relate to a period of time during which
a
user is enabled to take multiple puffs of aerosol generated from aerosol
generating
material without replacement or replenishment of the aerosol generating
material.
According to another aspect there is provided an aerosol generating system
corn prising:
an aerosol provision device as described above; and
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an aerosol generating article comprising aerosol generating material.
The aerosol generating article is inserted, in use, into the aerosol provision
device.
According to another aspect there is provided a method of generating aerosol
corn prising:
providing an aerosol provision device comprising one or more external aerosol
generators arranged to cause aerosol to be generated from aerosol generating
material
and one or more internal aerosol generators arranged to cause aerosol to be
generated
from aerosol generating material;
inserting an aerosol generating article into the aerosol provision device; and
selecting between a first mode of operation and a second mode of operation;
wherein in the first mode of operation the one or more external aerosol
generators are activated without activating the one or more internal aerosol
generators;
and
wherein in the second mode of operation the one or more internal aerosol
generators are activated without activating the one or more external aerosol
generators.
According to another aspect there is provided a method of generating aerosol
corn prising:
providing an aerosol provision device comprising one or more external aerosol
generators arranged to cause aerosol to be generated from aerosol generating
material
and one or more internal aerosol generators arranged to cause aerosol to be
generated
from aerosol generating material;
inserting an aerosol generating article into the aerosol provision device; and
either: (i) activating the one or more external aerosol generators initially
without
activating the one or more internal aerosol generators and then activating the
one or
more internal aerosol generators without activating the one or more external
aerosol
generators during a session of use; or (ii) activating the one or more
internal aerosol
generators initially without activating the one or more external aerosol
generators and
then activating the one or more external aerosol generators without activating
the one or
more internal aerosol generators during a session of use.
According to another aspect there is provided a method of generating aerosol
corn prising:
providing an aerosol provision device comprising one or more induction aerosol
generators arranged to cause aerosol to be generated from aerosol generating
material
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and one or more resistive or non-induction aerosol generators arranged to
cause aerosol
to be generated from aerosol generating material;
inserting an aerosol generating article into the aerosol provision device;
and;
selecting between a first mode of operation and a second mode of operation;
wherein in the first mode of operation one or more induction aerosol
generators
are activated without activating the one or more resistive or non-induction
aerosol
generators during a session of use; and
wherein in the second mode of operation the one or more resistive or non-
induction aerosol generators are activated without activating one or more
induction
aerosol generators during a session of use.
According to another aspect there is provided a method of generating aerosol
corn prising:
providing an aerosol provision device comprising one or more induction aerosol
generators arranged to cause aerosol to be generated from aerosol generating
material
and one or more resistive or non-induction aerosol generators arranged to
cause aerosol
to be generated from aerosol generating material; and
either: (i) activating one or more induction aerosol generators initially
without
activating the one or more resistive or non-induction aerosol generators and
then
activating the one or more resistive or non-induction aerosol generators
without
activating one or more induction aerosol generators during a session of use;
or (ii)
activating the one or more resistive or non-induction aerosol generators
initially without
activating one or more induction aerosol generators and then activating one or
more
induction aerosol generators without activating the one or more resistive or
non-induction
aerosol generators during a session of use.
BRIEF DESCRIPTION OF THE DRAWINGS
Various embodiments will now be described, by way of example only, and with
reference to the accompanying drawings in which:
Fig. 1A is a schematic diagram of a heating assembly of an aerosol provision
device and Fig. 1 B is a cross-section of the heating assembly shown in Fig.
1A with an
aerosol generating article disposed therein;
Fig. 2A is a schematic cross-section of an aerosol generating article for use
with
the aerosol provision device and Fig. 2B is a perspective view of the aerosol
provision
article;
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Fig. 3 is a graph showing a general temperature profile of a first heating
unit in an
aerosol provision device during an exemplary smoking session;
Fig. 4 is a graph showing a general temperature profile of a second heating
unit
in an aerosol provision device during an exemplary smoking session;
Fig. 5 is a graph showing a general programmed heating profile of a heating
element in an aerosol provision device during an exemplary session of use; and
Fig. 6 shows an aerosol provision device according to an embodiment comprising
an external induction heating unit, an external resistive heating unit and an
internal
resistive heating unit.
DETAILED DESCRIPTION
The term "aerosol generating material" includes materials that provide
volatilised
components upon heating, typically in the form of an aerosol. Aerosol
generating material
includes any tobacco-containing material and may, for example, include one or
more of
tobacco, tobacco derivatives, expanded tobacco, reconstituted tobacco or
tobacco
substitutes. Aerosol generating material also may include other, non-tobacco,
products,
which, depending on the product, may or may not contain nicotine. Aerosol
generating
material may for example be in the form of a solid, a liquid, a gel, a wax or
the like.
Aerosol generating material may for example also be a combination or a blend
of
materials. Aerosol generating material may also be known as "smokable
material". In an
embodiment, the aerosol generating material is a non-liquid aerosol generating
material.
In a particular embodiment, the non-liquid aerosol generating material
comprises
tobacco.
Apparatus is known that heats aerosol generating material to volatilise at
least
one component of the aerosol generating material, typically to form an aerosol
which can
be inhaled, without burning or combusting the aerosol generating material.
Such
apparatus is sometimes described as an "aerosol generating device", an
"aerosol
provision device", a "heat-not-burn device", a "tobacco heating product", a
"tobacco
heating product device", a "tobacco heating device" or similar. In an
embodiment the
aerosol provision device is a tobacco heating product. The non-liquid aerosol
generating
material for use with a tobacco heating product comprises tobacco.
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E-cigarette devices are also known which comprise aerosol provision devices
which vaporise an aerosol generating material in the form of a liquid, which
may or may
not contain nicotine. The aerosol generating material may be in the form of or
be
provided as part of a rod, cartridge or cassette or the like which can be
inserted into the
apparatus. A heater for heating and volatilising the aerosol generating
material may be
provided as a "permanent" part of the apparatus.
Aerosol provision devices are also known which generate aerosol from a hybrid
aerosol generating article. The hybrid aerosol generating article comprises a
section
which includes a cartomiser which includes a liquid or gel aerosol generating
material
and another section which includes solid aerosol generating material such as
tobacco
granules.
An aerosol provision device can receive an article comprising aerosol
generating
material for heating, also referred to as a "smoking article". An "article",
"aerosol
generating article" or "smoking article" in this context is a component that
includes or
contains in use the aerosol generating material, which is heated to volatilise
the aerosol
generating material, and optionally other components in use. A user may insert
the article
into the aerosol provision device before it is heated to produce an aerosol,
which the
user subsequently inhales. The article may be, for example, of a predetermined
or
specific size that is configured to be placed within a heating chamber of the
device which
is sized to receive the article.
The aerosol provision device according to various embodiments comprises a
plurality of aerosol generators for generating aerosol from aerosol generating
material in
use.
An aerosol generator is an apparatus configured to cause aerosol to be
generated from the aerosol-generating material. In some embodiments, the
aerosol
generator is a heater configured to subject the aerosol-generating material to
heat
energy, so as to release one or more volatiles from the aerosol-generating
material
to form an aerosol. In some embodiments, the aerosol generator is configured
to
cause an aerosol to be generated from the aerosol-generating material without
heating. For example, the aerosol generator may be configured to subject the
aerosol-generating material to one or more of vibration, increased pressure,
or
electrostatic energy.
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A heating unit typically refers to a component which is arranged to receive
electrical energy from an electrical energy source, and to supply thermal
energy to an
aerosol generating material. A heating unit may comprise a heating element. A
heating
element is typically a material which is arranged to supply heat to an aerosol
generating
material in use. The heating unit comprising the heating element may comprise
any other
component required, such as a component for transducing the electrical energy
received
by the heating unit. In other examples, the heating element itself may be
configured to
transduce electrical energy to thermal energy.
The heating unit may comprise an induction coil. In some examples, the coil is
configured to 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 aerosol generating material to thereby cause heating of the aerosol
generating material.
In some examples, the coil may be configured to generate, in use, a varying
magnetic field for penetrating at least one heating element, to thereby cause
induction
heating and/or magnetic hysteresis heating of the at least one heating
element. In such
an arrangement, the or each heating element may be termed a "susceptor". 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".
In some examples, the coils may be helical. In some examples, the coils may
encircle at least a part of a heating zone of the aerosol provision device
that is configured
to receive aerosol generating material. In some examples, the coils are a
helical coils
that encircle at least a part of the heating zone.
It has been found that induction heating units in an aerosol provision device
reach
a maximum operating temperature much more rapidly than corresponding resistive
heating elements. According to various embodiments, the aerosol provision
device may
be configured such that one or both heating units reaches its maximum
operating
temperature at a rate of at least 100 C per second. In a particular
embodiment, the
aerosol provision device may be configured such that one or both heating units
reaches
the maximum operating temperature at a rate of at least 150 C per second.
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Induction heating systems may be of interest because the varying magnetic
field
magnitude can be easily controlled by controlling power supplied to the
heating unit.
Moreover, as induction heating does not require a physical connection to be
provided
between the source of the varying magnetic field and the heat source, design
freedom
and control over the heating profile may be greater, and cost may be lower.
The aerosol provision device may comprise a heating assembly. The heating
assembly may comprise a first heating unit and a second heating unit.
The first heating unit and the second heating unit may comprise induction
heating
units and the units may be controllable independent from each other. Heating
the aerosol
generating material with independent heating units may provide more accurate
control of
heating of the aerosol generating material. Independently controllable heating
units may
also provide thermal energy differently to each portion of the aerosol
generating material,
resulting in differing temperature profiles across portions of the aerosol
generating
material.
According to various embodiments, the first and second heating units may be
configured to have temperature profiles which differ from each other in use.
This may
provide asymmetrical heating of the aerosol generating material along a
longitudinal
plane between the mouth end and the distal end of the aerosol provision device
when
the aerosol provision device is in use.
Alternatively, the first and second heating units may be configured to have
temperature profiles which are substantially the same in use. This may provide
symmetrical heating of the aerosol generating material along a longitudinal
plane
between the mouth end and the distal end of the aerosol provision device when
the
aerosol provision device is in use.
An object that is capable of being inductively heated is known as a susceptor.
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.
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Reference may be made to the temperature of one or more heating units or
heating elements throughout the present specification. The temperature of a
heating unit
or heating element may also be conveniently referred to as the temperature of
the
heating unit which comprises the heating element. This does not necessarily
mean that
the entire heating unit is at the given temperature. For example, where
reference is made
to the temperature of an induction heating unit, it does not necessarily mean
that both
the inductive element and the susceptor have such a temperature. Rather, in
this
example, the temperature of the induction heating unit corresponds to the
temperature of
the heating element composed in the induction heating unit. For the avoidance
of doubt,
the temperature of a heating element and the temperature of a heating unit can
be used
interchangeably.
As used herein, "temperature profile" or "heating profile" refers to the
variation of
temperature of a material over time. For example, the varying temperature of a
heating
element or heating unit measured at the heating element or heating unit for
the duration
of a smoking session may be referred to as the temperature profile or heating
profile of
that heating element or heating unit. The heating elements or heating units
provide heat
to the aerosol generating material during use, to generate an aerosol. The
temperature
profile or heating profile of the heating element or heating unit therefore
induces the
temperature profile of aerosol generating material disposed near the heating
element or
heating unit.
"Operating temperature" as used herein in relation to a heating element or
heating unit refers to any heating element temperature at which the element
can heat an
aerosol generating material to produce sufficient aerosol for a satisfactory
puff without
combusting the aerosol generating material. The maximum operating temperature
of a
heating element or heating unit is the highest temperature reached by the
heating
element or heating unit during a smoking session. The lowest operating
temperature of
the heating element or heating unit refers to the lowest heating element
temperature at
which sufficient aerosol can be generated from the aerosol generating material
by the
heating element or heating unit for a satisfactory puff. Where there are a
plurality of
heating elements or heating units present in the aerosol provision device,
each heating
element or heating unit has an associated maximum operating temperature. The
maximum operating temperature of each heating element or heating unit may be
the
same, or it may differ for each heating element or heating unit.
In the aerosol provision device according to an embodiment each heating
element or heating unit may be arranged to cause the release of aerosol from
aerosol
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generating material in a non-combustible manner. Although the temperature
profile or
heating profile of each heating element or heating unit may induce the
temperature
profile of each associated portion of aerosol generating material, the
temperature profiles
or heating profiles of the heating element or heating unit and the associated
portion of
aerosol generating material may not exactly correspond. For example, there may
be
"bleed" in the form of conduction, convection and/or radiation of heat energy
from one
portion of the aerosol generating material to another; there may be variations
in
conduction, convection and/or radiation of heat energy from the heating
elements or
heating units to the aerosol generating material; there may be a lag between
the change
in the temperature profile of the heating element or heating unit and the
change in the
temperature profile of the aerosol generating material, depending on the heat
capacity of
the aerosol generating material.
The aerosol provision device may comprise a controller for controlling each
heating unit present in the aerosol provision device. The controller may
comprise a
printed circuit board ("PCB"). The controller may be configured to control the
power
supplied to each heating unit, and control the "programmed heating profile" of
each
heating unit present in the aerosol provision device. For example, the
controller may be
programmed to control the current supplied to a plurality of inductors to
control the
resulting temperature profiles or heating profiles of the corresponding
induction heating
elements or induction heating units. As between the temperature profile of
heating
elements/units and aerosol generating material described above, the programmed
heating profile of a heating element or heating unit may not exactly
correspond to the
observed temperature profile of a heating element or heating unit, for the
same reasons
given above.
The term "operating temperature" can also be used in relation to the aerosol
generating material. In this case, the term refers to any temperature of the
aerosol
generating material itself at which sufficient aerosol is generated from the
aerosol
generating material for a satisfactory puff. The maximum operating temperature
of the
aerosol generating material is the highest temperature reached by any part of
the aerosol
generating material during a smoking session. In some embodiments, the maximum
operating temperature of the aerosol generating material is greater than 200
C, 210 C,
220 C, 230 C, 240 C, 250 C, 260 C or 270 'C. In some embodiments, the
maximum
operating temperature of the aerosol generating material is less than 300 C,
290 C,
280 C, 270 C, 260 C or 250 C. The lowest operating temperature is the
lowest
temperature of aerosol generating material at which sufficient aerosol is
generated from
the material to product sufficient aerosol for a satisfactory "puff". In some
embodiments,
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the lowest operating temperature of the aerosol generating material is greater
than 90
C, 100 C, 110 C, 120 C, 130 C, 140 C or 150 C. In some embodiments, the
lowest
operating temperature of the aerosol generating material is less than 150 CC,
140 C,
130 C or 120 C.
Various embodiments are disclosed which reduce the amount of time it takes for
an aerosol provision device to be ready for use, and more generally improve
the
inhalation experience for a user. Surprisingly, it has been found that
reducing the time
taken for a heating element or heating unit to reach an operating temperature
may at
least partially alleviate "hot puff", a phenomenon which occurs when the
generated
aerosol contains a high water content. Accordingly, the aerosol provision
device
according to various embodiments may provide an inhalable aerosol to a
consumer
which has better organoleptic properties than an aerosol provided by a
conventional
aerosol provision device which does not include a heating unit which reaches a
maximum operating temperature as rapidly.
In some embodiments, the aerosol provision device is configured such that at
least one heating element or heating unit in the device reaches its maximum
operating
temperature within 20 seconds, and the first temperature at which the at least
one
heating unit is held for at least 1 second, 2 seconds, 3 seconds, 4 seconds, 5
seconds,
10 seconds, or 20 seconds is the maximum operating temperature. That is, in
these
embodiments, the heating unit is not held at a temperature which is not the
maximum
operating temperature before reaching the maximum operating temperature.
In some embodiments, the at least one heating unit reaches its maximum
operating temperature within the given period from ambient temperature.
The aerosol provision device may be configured to operate as described herein.
The aerosol provision device may at least partially be configured to operate
in this
manner by a controller which may be programmed to operate the device in one or
more
different modes. Accordingly, references herein to the configuration of the
aerosol
provision device or components thereof may refer to the controller being
programmed to
operate the aerosol provision device as disclosed herein, amongst other
features (such
as spatial arrangement of the heating units).
Aerosol generating articles for aerosol provision devices (such as tobacco
heating products) usually contain more water and/or aerosol generating agent
than
combustible smoking articles to facilitate formation of an aerosol in use.
This higher
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water and/or aerosol generating agent content can increase the risk of
condensate
collecting within the aerosol provision device during use, particularly in
locations away
from the heating unit(s). This problem may be greater in aerosol provision
devices with
enclosed heating chambers, and particularly those with external heaters, than
those
provided with internal heaters (such as "blade" heaters). Without wishing to
be bound by
theory, it is believed that since a greater proportion/surface area of the
aerosol
generating material is heated by external-heating heating assemblies, more
aerosol is
released than an aerosol provision device which heats the aerosol generating
material
internally, leading to more condensation of the aerosol within the aerosol
provision
device.
Various programmed heating profiles may be employed in an aerosol provision
device configured to externally and/or internally heat aerosol generating
material to
provide a desirable amount of aerosol to the user whilst keeping the amount of
aerosol
which condenses inside the aerosol provision device relatively low. For
example, the
maximum operating temperature of a heating unit may affect the amount of
condensate
formed. It may be that lower maximum operating temperatures provide less
undesirable
condensate. The difference between maximum operating temperatures of heating
units
in a heating assembly may also affect the amount of condensate formed.
Further, the
point in a session of use at which each heating unit reaches its maximum
operating
temperature may affect the amount of condensate formed.
In use, the aerosol provision device may heat an aerosol generating material
to
provide an inhalable aerosol. The aerosol provision device may be referred to
as "ready
for use" when at least a portion of the aerosol generating material has
reached a lowest
operating temperature and a user can take a puff which contains a satisfactory
amount of
aerosol. In some embodiments the aerosol provision device may be ready for use
within
approximately 20 seconds of supplying power to one or both heating units, or
15
seconds, or 10 seconds or 5 seconds. The aerosol provision device may be ready
for
use within approximately 20 seconds of activation of the device, or 15
seconds, or 10
seconds or 5 seconds. The aerosol provision device may begin supplying power
to a
heating unit such as the first heating unit or the second heating unit when
the device is
activated, or it may begin supplying power to the heating unit after the
aerosol provision
device is activated. The aerosol provision device may be configured such that
power
starts being supplied to one or the heating units some time after activation
of the aerosol
provision device, such as at least 1 second, 2 seconds or 3 seconds after
activation of
the aerosol provision device. The aerosol provision device may be configured
such that
power is not supplied to one of the heating units, or any heating unit present
in the
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heating assembly until at least 2.5 seconds after activation of the aerosol
provision
device. This may prolong battery life by avoiding unintentional activation of
the heating
unit(s).
The aerosol provision device may be ready for use more quickly than
corresponding aerosol provision devices known in the art, providing an
improved user
experience. Generally, the point at which the aerosol provision device is
ready for use
will be some time after one of the heating units has reached its maximum
operating
temperature, as it will take some amount of time to transfer sufficient
thermal energy
from the heating unit to the aerosol generating material in order to generate
the aerosol.
The aerosol provision device may be ready for use within 20 seconds of one of
the
heating units reaching its maximum operating temperature, or 15 seconds, or 10
seconds or 5 seconds.
In some embodiments, the user's sensorial experience arising from the aerosol
generated by the present device is like that of smoking a combustible
cigarette, such as
a factory-made cigarette.
The aerosol provision device may indicate that it is ready for use via an
indicator.
In an embodiment, the aerosol provision device may be configured such that the
indicator indicates that the aerosol provision device is ready for use within
approximately
20 seconds of power being supplied to one of the heating units, or 15 seconds,
or 10
seconds or 5 seconds. In a particular embodiment, the aerosol provision device
may be
configured such that the indicator indicates that the aerosol provision device
is ready for
use within approximately 20 seconds of activation of the device, or 15
seconds, or 10
seconds or 5 second. In another embodiment, the device is configured such that
the
indicator indicates that the device is ready for use within approximately 20
seconds of the
first heating unit reaching its maximum operating temperature, or 15 seconds,
or 10
seconds.
As used herein, "puff" refers to a single inhalation by the user of the
aerosol
generated by the aerosol provision device.
"Session of use" as used herein refers to a single period of use of the
aerosol
provision device by a user. The session of use begins at the point at which
power is first
supplied to at least one heating unit present in the heating assembly. The
device will be
ready for use after a period of time has elapsed from the start of the session
of use.
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The session of use may end at the point at which no power is supplied to any
of
the heating units in the aerosol provision device. The end of the session of
use may
coincide with the point at which the aerosol generating article is depleted
(the point at
which the total particulate matter yield (mg) in each puff would be deemed
unacceptably
low by a user). The session may comprise a plurality of puffs. The session may
have a
duration less than 7 minutes, or 6 minutes, or 5 minutes, or 4 minutes and 30
seconds,
or 4 minutes, or 3 minutes and 30 seconds. In some embodiments, the session of
use
may have a duration of from 2 to 5 minutes, or from 3 to 4.5 minutes, or 3.5
to 4.5
minutes or approximately 4 minutes. A session may be initiated by the user
actuating a
button or switch on the device, causing at least one heating unit to begin
rising in
temperature when activated or some time after activation.
A session of use may be determined to begin when power or energy is first
supplied to a heating unit after an aerosol generating article has been
inserted into the
aerosol provision device. A session of use may be determined to begin when
power or
energy is first supplied to one or more heating units in order to raise the
temperature of
the one or more heating units to an operating temperature Tmin such that a
user can
take a first puff of aerosol generated from the aerosol generating material.
According to
various embodiments Tmin may be in the range: (i) 200-210 C; (ii) 210-220 C;
(iii) 220-
230 C; (iv) 230-240 C; (v) 240-250 C; (vi) 250-260 C; (vii) 260-270 C;
(viii) 270-280
C; (ix) 280-290 C; and (x) 290-300 C.
A session of use may be determined to end when power or energy is no longer
supplied to the one or more heating units. A session of use may be determined
to end
when the aerosol generating material is substantially spent or wherein a user
is unable to
take further puffs of aerosol generated from the aerosol generating material.
A session of use may be determined to relate to a period of time during which
a
user is enabled to take multiple puffs of aerosol generated from aerosol
generating
material without replacement or replenishment of the aerosol generating
material.
In some embodiments, the aerosol provision device may be operable in at least
a
first (e.g. base) mode of operation and a second (e.g. boost) mode of
operation.
The heating assembly may be operable in a maximum of two modes of operation,
or may be operable in more than two modes, such as three modes, four modes, or
five
modes.
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Each mode of operation may be associated with a predetermined heating profile
for each heating unit in the heating assembly, such as a programmed heating
profile.
One or more of the programmed heating profiles may be programmed or selected
by a
user. Additionally, or alternatively, one or more of the programmed heating
profiles may
be programmed by the manufacturer. In these examples, the one or more
programmed
heating profiles may be fixed such that an end user cannot alter the one or
more
programmed heating profiles.
The modes of operation may be selectable by a user. For example, the user may
select a desired mode of operation by interacting with a user interface. Power
may begin
to be supplied to a first heating unit at substantially the same time as the
desired mode of
operation is selected.
Each mode may be associated with a temperature profile which differs from the
temperature profiles of the other modes. Further, one or more modes may be
associated
with a different point at which the device is ready for use. For example, the
heating
assembly may configured such that, in a first mode, the device is ready for
use a first
period of time after the start of a session of use, and in a second mode, the
device is
ready for use a second period of time after the start of the session. The
first period of
time may be different from the second period of time.
In some examples, the heating assembly may be configured such that the
aerosol provision device is ready for use within 30, 25 seconds, 20 seconds or
15
seconds of supplying power to a heating unit when operated in the first mode.
The
heating assembly may also be configured such that the aerosol provision device
is ready
for use in a shorter period of time when operating in the second mode - within
25
seconds, 20 seconds, 15 seconds, or 10 seconds of supplying power to a heating
unit
when operating in the second mode.
In a particular embodiment, the aerosol provision device may be configured
such
that the indicator indicates that the aerosol provision device is ready for
use within 20
seconds of selection of a first (e.g. base) mode, and within 10 seconds of
selection of a
second (e.g. boost) mode.
Providing an aerosol provision device such as a tobacco heating product with a
heating assembly that is operable in a plurality of modes (e.g. base mode and
boost
mode) gives more choice to the consumer, particularly where each mode is
associated
with a different maximum heater temperature. Moreover, such an aerosol
provision
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device is capable of providing different aerosols having differing
characteristics, because
volatile components in the aerosol generating material will be volatilised at
different rates
and concentrations at different heater temperatures. This allows a user to
select a
particular mode based on a desired characteristic of the inhalable aerosol,
such as
degree of tobacco flavour, nicotine concentration, and aerosol temperature.
For example,
modes in which the aerosol provision device is ready for use more quickly
(e.g. a second
or "boost" mode) may provide a quicker first puff, or a greater nicotine
content per puff, or
a more concentrated flavour per puff. Conversely, modes in which the aerosol
provision
device is ready for use at a later point in the session of use (e.g. a first
or base mode)
may provide a longer overall session of use, lower nicotine content per puff,
and more
sustained delivery of flavour.
In embodiments wherein the aerosol provision device is ready for use more
quickly in a second (e.g. boost) mode, and/or the first and/or second heating
unit has a
higher maximum operating temperature in the second mode, the second mode may
be
referred to as a "boost" mode. Various embodiments provide an aerosol
provision device
which is operable in a first "normal" or "base" mode and a second "boost"
mode. The
"boost" mode may provide a quicker first puff, or a greater nicotine content
per puff, or a
more concentrated flavour per puff.
The aerosol provision device may comprise a maximum of two aerosol
generators. In other examples, the aerosol provision device may comprise more
than two
independently controllable aerosol generators, such as three, four or five
independently
controllable aerosol generators.
As discussed hereinabove, in some embodiments, at least one of the aerosol
generators provided in the heating assembly may comprise an induction heating
unit. In
these embodiments, the heating unit comprises an inductor (for example, one or
more
inductor coils), and the aerosol provision device may be arranged to pass a
varying
electrical current, such as an alternating current, through the inductor. The
varying
electric current in the inductor produces a varying magnetic field. When the
inductor and
the heating element are suitably relatively positioned so that the varying
magnetic field
produced by the inductor penetrates the heating element, one or more eddy
currents are
generated inside the heating element. The heating element has a resistance to
the flow
of electrical currents, so when such eddy currents are generated in the
object, their flow
against the electrical resistance of the object causes the object to be heated
by Joule
heating. Supplying a varying magnetic field to a susceptor may conveniently be
referred
to as supplying energy to a susceptor.
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An aerosol generating system is disclosed comprising an aerosol provision
device as described herein in combination with an aerosol generating article.
The aerosol provision device may comprise a non-combustible apparatus or a
tobacco heating product ("THP") for heating smokable material without burning
or
corn busting the smokable material.
An aerosol provision device or aerosol generating device will now be described
in
more detail.
Fig. 1A shows an induction heating assembly 100 of an aerosol provision device
which is given for illustrative purposes to illustrate various aspects of a
heat not but
aerosol provision device. Fig. 1B shows a cross section of the induction
heating
assembly 100 of the device. In alternative embodiments, the heating assembly
may
corn prise a resistive heating assembly wherein the aerosol generator
comprises one or
more electrically resistive heaters. According to an embodiment the one or
more
electrically resistive heaters may comprise a winding of electrically
resistive wire or a thin
film. The winding of electrically resistive wire or thin film may be provided
in a tubular
arrangement which surrounds the aerosol generating article.
The heating assembly 100 has a first or proximal or mouth end 102, and a
second or distal end 104. In use, the user will inhale the formed aerosol from
the mouth
end of the aerosol provision device. The mouth end may be an open end.
The heating assembly 100 comprises a first induction heating unit 110 and a
second induction heating unit 120. The first induction heating unit 110
comprises a first
inductor coil 112 and a first heating element 114. The second induction
heating unit 120
comprises a second inductor coil 122 and a second heating element 124.
Figs. 1A and 1B show an aerosol generating article 130 received within a
susceptor 140 (see Fig. 1B). The susceptor 140 forms the first induction
heating element
114 and the second induction heating element 124. The susceptor 140 may be
formed
from any material suitable for heating by induction. For example, the
susceptor 140 may
comprise metal. In some embodiments, the susceptor 140 may comprise non-
ferrous
metal such as copper, nickel, titanium, aluminium, tin, or zinc, and/or
ferrous material
such as iron, nickel or cobalt. Additionally or alternatively the susceptor
140 may
comprise a semiconductor such as silicon carbide, carbon or graphite.
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Each induction heating element present in the aerosol provision device may
have
any suitable shape. In the embodiment shown in Fig. 1B, the induction heating
elements
114,124 define a receptacle to surround an aerosol generating article and heat
the
aerosol generating article externally. In other embodiments (not shown), one
or more
induction heating elements may be substantially elongate, arranged to
penetrate an
aerosol generating article and heat the aerosol generating article internally.
As shown in Fig. 1B, the first induction heating element 114 and second
induction
heating element 124 may be provided together as a monolithic element 140. That
is, in
some embodiments, there is no physical distinction between the first 114 and
second
124 heating elements. Rather, the differing characteristics between the first
and second
aerosol generators 110, 120 are defined by separate inductor coils 112,122
surrounding
each induction heating element 114,124, so that they may be controlled
independently
from each other. In other embodiments (not depicted), physically distinct
inductive
heating elements may be employed.
The first and second inductor coils 112,122 may be made from an electrically
conducting material. In this example, the first and second inductor coils
112,122 are
made from Litz wire/cable which is wound in a helical fashion to provide
helical inductor
coils 112,122. 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 induction heating
assembly
100, the first and second inductor coils 124,126 are made from copper Litz
wire which
has a circular cross section. In other examples the Litz wire can have other
shape cross
sections, such as rectangular.
The first inductor coil 112 is configured to generate a first varying magnetic
field
for heating the first induction heating element 114, and the second inductor
coil 122 is
configured to generate a second varying magnetic field for heating a second
section of
the susceptor 124. The first inductor coil 112 and the first induction heating
element 114
taken together form a first induction heating unit 110. Similarly, the second
inductor coil
122 and the second induction heating element 124 taken together form a second
induction heating unit 120.
In this example, the first inductor coil 112 is adjacent to the second
inductor coil
122 in a direction along the longitudinal axis of the device heating assembly
100 (that is,
the first and second inductor coils 112,122 do not overlap). The susceptor
arrangement
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140 may comprise a single susceptor. Ends 150 of the first and second inductor
coils
112,122 can be connected to a controller such as a PCB (not shown). In
embodiments,
the controller comprises a PID controller (proportional integral derivative
controller).
The varying magnetic field generates eddy currents within the first inductive
heating element 114, thereby rapidly heating the first induction heating
element 114 to a
maximum operating temperature within a short period of time from supplying the
alternative current to the coil 112, for example within 20, 15, 12, 10, 5, or
2 seconds.
Arranging the first induction heating unit 110 which is configured to rapidly
reach a
maximum operating temperature closer to the mouth end 102 of the heating
assembly
100 than the second induction heating unit 120 may mean that an acceptable
aerosol is
provided to a user as soon as possible after initiation of a session of use.
It will be appreciated that the first and second inductor coils 112,122, in
some
examples, may have at least one characteristic different from each other. For
example,
the first inductor coil 112 may have at least one characteristic different
from the second
inductor coil 122. More specifically, in one example, the first inductor coil
112 may have a
different value of inductance than the second inductor coil 122. In Figures 1A
and 1B, the
first and second inductor coils 112,122 are of different lengths such that the
first inductor
coil 112 is wound over a smaller section of the susceptor 140 than the second
inductor
coil 122. Thus, the first inductor coil 112 may comprise a different number of
turns than
the second inductor coil 122 (assuming that the spacing between individual
turns is
substantially the same). In yet another example, the first inductor coil 112
may be made
from a different material to the second inductor coil 122. In some examples,
the first and
second inductor coils 112,122 may be substantially identical.
In this example, the first inductor coil 112 and the second inductor coil 122
are
wound in the same direction. However, in another embodiment, the inductor
coils
112,122 may be wound in opposite directions. This can be useful when the
inductor coils
are active at different times. For example, initially, the first inductor coil
112 may be
operating to heat the first induction heating element 114, and at a later
time, the second
inductor coil 122 may be operating to heat the second induction heating
element 124.
Winding the coils in opposite directions helps reduce the current induced in
the inactive
coil when used in conjunction with a particular type of control circuit. In
one example, the
first inductor coil 112 may be a right-hand helix and the second inductor coil
122 a left-
hand helix. In another example, the first inductor coil 112 may be a left-hand
helix and
the second inductor coil 122 may be a right-hand helix.
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The coils 112,122 may have any suitable geometry. Without wishing to be bound
by theory, configuring an induction heating element to be smaller (e.g.
smaller pitch helix;
fewer revolutions in the helix; shorter overall length of the helix), may
increase the rate at
which the induction heating element can reach a maximum operating temperature.
In
some embodiments, the first coil 112 may have a length of less than
approximately
20 mm, less than 18 mm, less than 16 mm, or a length of approximately 14 mm,
in the
longitudinal direction of the heating assembly 100. The first coil 112 may
have a length
shorter than the second coil 124 in the longitudinal direction of the heating
assembly 100.
Such an arrangement may provide asymmetrical heating of the aerosol generating
article
along the length of the aerosol generating article.
The susceptor 140 of this example is hollow and therefore defines a receptacle
within which aerosol generating material is received. For example, the article
130 can be
inserted into the susceptor 140. In this example the susceptor 140 is tubular,
with a
circular cross section.
The induction heating elements 114 and 124 are arranged to surround the
aerosol generating article 130 and heat the aerosol generating article 130
externally. The
aerosol provision device is configured such that, when the aerosol generating
article 130
is received within the susceptor 140, the outer surface of the article 130
abuts the inner
surface of the susceptor 140. This ensures that the heating is most efficient.
The article
130 of this example comprises aerosol generating material. The aerosol
generating
material is positioned within the susceptor 140. The article 130 may also
comprise other
components such as a filter, wrapping materials and/or a cooling structure.
The heating assembly 100 is not limited to two aerosol generators. In some
examples, the heating assembly 100 may comprise three, four, five, six, or
more than six
aerosol generators. These aerosol generators may each be controllable
independent
from the other aerosol generators present in the heating assembly 100.
Referring to Figs 2A and 2B, there is shown a partially cut-away section view
and
a perspective view of an example of an aerosol generating article 200. The
aerosol
generating article 200 shown in Figs 2A and 2B corresponds to the aerosol
generating
article 130 shown in Fig. 1.
The aerosol generating article 200 may be any shape suitable for use with an
aerosol provision device. The aerosol generating article 130 may be in the
form of or
provided as part of a cartridge or cassette or rod which can be inserted into
the
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apparatus. In the embodiment shown in Figs 1A and 1B and 2, the aerosol
generating
article 130 is in the form of a substantially cylindrical rod that includes a
body of
smokable material 202 and a filter assembly 204 in the form of a rod. The
filter assembly
204 includes three segments, a cooling segment 206, a filter segment 208 and a
mouth
end segment 210. The article 200 has a first end 212, also known as a mouth
end or a
proximal end and a second end 214, also known as a distal end. The body of
aerosol
generating material 202 is located towards the distal end 214 of the article
200. In one
example, the cooling segment 206 is located adjacent the body of aerosol
generating
material 202 between the body of aerosol generating material 202 and the
filter segment
208, such that the cooling segment 206 is in an abutting relationship with the
aerosol
generating material 202 and the filter segment 208. In other examples, there
may be a
separation between the body of aerosol generating material 202 and the cooling
segment 206 and between the body of aerosol generating material 202 and the
filter
segment 208. The filter segment 208 is located in between the cooling segment
206 and
the mouth end segment 210. The mouth end segment 210 is located towards the
proximal end 212 of the article 200, adjacent the filter segment 208. In one
example, the
filter segment 208 is in an abutting relationship with the mouth end segment
210. In one
embodiment, the total length of the filter assembly 204 is between 37 mm and
45 mm,
and optionally the total length of the filter assembly 204 is 41 mm.
In use, portions 202a and 202b of the body of aerosol generating material 202
may correspond to the first induction heating element 114 and second induction
heating
element 124 of the portion 100 shown in Fig. 1B respectively.
The body of smokable material may have a plurality of portions 202a,202b which
correspond to the plurality of induction heating elements present in the
aerosol provision
device. For example, the aerosol generating article 200 may have a first
portion 202a
which corresponds to the first induction heating element 114 and a second
portion 202b
which corresponds to the second induction heating element 124. These portions
202a,202b may exhibit temperature profiles which are different from each other
during a
session of use; the temperature profiles of the portions 202a,202b may derive
from the
temperature profiles of the first induction heating element 114 and second
induction
heating element 124 respectively.
Where there is a plurality of portions 202a,202b of a body of aerosol
generating
material 202, any number of the substrate portions 202a,202b may have
substantially the
same composition. In a particular example, all of the portions 202a,202b of
the substrate
have substantially the same composition. In one embodiment, body of aerosol
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generating material 202 is a unitary, continuous body and there is no physical
separation
between the first and second portions 202a,202b, and the first and second
portions have
substantially the same composition.
In one embodiment, the body of aerosol generating material 202 comprises
tobacco. However, in other respective embodiments, the body of smokable
material 202
may consist of tobacco, may consist substantially entirely of tobacco, may
comprise
tobacco and aerosol generating material other than tobacco, may comprise
aerosol
generating material other than tobacco, or may be free of tobacco. The aerosol
generating material may include an aerosol generating agent, such as glycerol.
In a particular embodiment, the aerosol generating material may comprise one
or
more tobacco components, filler components, binders and aerosol generating
agents.
The filler component may be any suitable inorganic filler material. Suitable
inorganic filler materials include, but are not limited to: calcium carbonate
(i.e. chalk),
perlite, vermiculite, diatomaceous earth, colloidal silica, magnesium oxide,
magnesium
sulphate, magnesium carbonate, and suitable inorganic sorbents, such as
molecular
sieves. Calcium carbonate is particularly suitable. In some cases, the filler
comprises an
organic material such as wood pulp, cellulose and cellulose derivatives.
The binder may be any suitable binder. In some embodiments, the binder
comprises one or more of an alginate, celluloses or modified celluloses,
polysaccharides,
starches or modified starches, and natural gums.
Suitable binders include, but are not limited to: alginate salts comprising
any
suitable cation, such as sodium alginate, calcium alginate, and potassium
alginate;
celluloses or modified celluloses, such as hydroxypropyl cellulose and
carboxymethylcellulose; starches or modified starches; polysaccharides such as
pectin
salts comprising any suitable cation, such as sodium, potassium, calcium or
magnesium
pectate; xanthan gum, guar gum, and any other suitable natural gums.
A binder may be included in the aerosol generating material in any suitable
quantity and concentration.
The "aerosol generating agent" is an agent that promotes the generation of an
aerosol. An aerosol generating agent may promote the generation of an aerosol
by
promoting an initial vaporisation and/or the condensation of a gas to an
inhalable solid
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and/or liquid aerosol. In some embodiments, an aerosol generating agent may
improve
the delivery of flavour from the aerosol generating article.
In general, any suitable aerosol generating agent or agents may be included in
the aerosol generating material. Suitable aerosol generating agent 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 particular embodiment, the aerosol generating material comprises a
tobacco
component in an amount of from 60 to 90% by weight of the tobacco composition,
a filler
component in an amount of 0 to 20% by weight of the tobacco composition, and
an
aerosol generating agent in an amount of from 10 to 20% by weight of the
tobacco
composition. The tobacco component may comprise paper reconstituted tobacco in
an
amount of from 70 to 100% by weight of the tobacco component.
In one example, the body of aerosol generating material 202 is between 34 mm
and 50 mm in length, optionally, the body of aerosol generating material 202
is between
38 mm and 46 mm in length, optionally still, the body of aerosol generating
material 202
is 42 mm in length.
In one example, the total length of the article 200 is between 71 mm and 95
mm,
optionally, total length of the article 200 is between 79 mm and 87 mm,
optionally still,
total length of the article 200 is 83 mm.
An axial end of the body of aerosol generating material 202 is visible at the
distal
end 214 of the article 200. However, in other embodiments, the distal end 214
of the
article 200 may comprise an end member (not shown) covering the axial end of
the body
of aerosol generating material 202.
The body of aerosol generating material 202 is joined to the filter assembly
204
by annular tipping paper (not shown), which is located substantially around
the
circumference of the filter assembly 204 to surround the filter assembly 204
and extends
partially along the length of the body of aerosol generating material 202. In
one example,
the tipping paper is made of 58GSM standard tipping base paper. In one example
has a
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length of between 42 mm and 50 mm, and optionally, the tipping paper has a
length of
46mm.
In one example, the cooling segment 206 is an annular tube and is located
around and defines an air gap within the cooling segment. The air gap provides
a
chamber for heated volatilised components generated from the body of aerosol
generating material 202 to flow. The cooling segment 206 is hollow to provide
a chamber
for aerosol accumulation yet rigid enough to withstand axial compressive
forces and
bending moments that might arise during manufacture and whilst the article 200
is in use
during insertion into the device 100. In one example, the thickness of the
wall of the
cooling segment 206 is approximately 0.29 mm.
The cooling segment 206 provides a physical displacement between the aerosol
generating material 202 and the filter segment 208. The physical displacement
provided
by the cooling segment 206 will provide a thermal gradient across the length
of the
cooling segment 206. In one example the cooling segment 206 is configured to
provide a
temperature differential of at least 40 C between a heated volatilised
component
entering a first end of the cooling segment 206 and a heated volatilised
component
exiting a second end of the cooling segment 206. In one example the cooling
segment
206 is configured to provide a temperature differential of at least 60 C
between a heated
volatilised component entering a first end of the cooling segment 206 and a
heated
volatilised component exiting a second end of the cooling segment 206. This
temperature differential across the length of the cooling element 206 protects
the
temperature sensitive filter segment 208 from the high temperatures of the
aerosol
generating material 202 when it is heated by the heating assembly 100 of the
device
aerosol provision device. If the physical displacement was not provided
between the filter
segment 208 and the body of aerosol generating material 202 and the heating
elements
114,124 of the heating assembly 100, then the temperature sensitive filter
segment may
208 become damaged in use, so it would not perform its required functions as
effectively.
In one example the length of the cooling segment 206 is at least 15 mm. In one
example, the length of the cooling segment 206 is between 20 mm and 30 mm,
more
particularly 23 mm to 27 mm, more particularly 25 mm to 27 mm and more
particularly 25
mm.
The cooling segment 206 is made of paper, which means that it is comprised of
a
material that does not generate compounds of concern, for example, toxic
compounds
when in use adjacent to the heater assembly 100 of the aerosol provision
device. In one
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example, the cooling segment 206 is manufactured from a spirally wound paper
tube
which provides a hollow internal chamber yet maintains mechanical rigidity.
Spirally
wound paper tubes are able to meet the tight dimensional accuracy requirements
of
high-speed manufacturing processes with respect to tube length, outer
diameter,
roundness and straightness.
In another example, the cooling segment 206 is a recess created from stiff
plug
wrap or tipping paper. The stiff plug wrap or tipping paper is manufactured to
have a
rigidity that is sufficient to withstand the axial compressive forces and
bending moments
that might arise during manufacture and whilst the article 200 is in use
during insertion
into the device 100.
For each of the examples of the cooling segment 206, the dimensional accuracy
of the cooling segment is sufficient to meet the dimensional accuracy
requirements of
high-speed manufacturing process.
The filter segment 208 may be formed of any filter material sufficient to
remove
one or more volatilised compounds from heated volatilised components from the
smokable material. In one example the filter segment 208 is made of a mono-
acetate
material, such as cellulose acetate. The filter segment 208 provides cooling
and irritation-
reduction from the heated volatilised components without depleting the
quantity of the
heated volatilised components to an unsatisfactory level for a user.
The density of the cellulose acetate tow material of the filter segment 208
controls
the pressure drop across the filter segment 208, which in turn controls the
draw
resistance of the article 200. Therefore, the selection of the material of the
filter segment
208 is important in controlling the resistance to draw of the article 200. In
addition, the
filter segment 208 performs a filtration function in the article 200.
In one example, the filter segment 208 is made of a 8Y15 grade of filter tow
material, which provides a filtration effect on the heated volatilised
material, whilst also
reducing the size of condensed aerosol droplets which result from the heated
volatilised
material which consequentially reduces the irritation and throat impact of the
heated
volatilised material to satisfactory levels.
The presence of the filter segment 208 provides an insulating effect by
providing
further cooling to the heated volatilised components that exit the cooling
segment 206.
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This further cooling effect reduces the contact temperature of the user's lips
on the
surface of the filter segment 208.
One or more flavours may be added to the filter segment 208 in the form of
either
direct injection of flavoured liquids into the filter segment 208 or by
embedding or
arranging one or more flavoured breakable capsules or other flavour carriers
within the
cellulose acetate tow of the filter segment 208.
In one example, the filter segment 208 is between 6 mm to 10 mm in length,
optionally 8 mm.
The mouth end segment 210 is an annular tube and is located around and
defines an air gap within the mouth end segment 210. The air gap provides a
chamber
for heated volatilised components that flow from the filter segment 208. The
mouth end
segment 210 is hollow to provide a chamber for aerosol accumulation yet rigid
enough to
withstand axial compressive forces and bending moments that might arise during
manufacture and whilst the article is in use during insertion into the device
100. In one
example, the thickness of the wall of the mouth end segment 210 is
approximately 0.2
9mm.
In one example, the length of the mouth end segment 210 is between 6 mm to 10
mm and optionally 8 mm. In one example, the thickness of the mouth end segment
is
0.29 mm.
The mouth end segment 210 may be manufactured from a spirally wound paper
tube which provides a hollow internal chamber yet maintains critical
mechanical rigidity.
Spirally wound paper tubes are able to meet the tight dimensional accuracy
requirements
of high-speed manufacturing processes with respect to tube length, outer
diameter,
roundness and straightness.
The mouth end segment 210 provides the function of preventing any liquid
condensate that accumulates at the exit of the filter segment 208 from coming
into direct
contact with a user.
It should be appreciated that, in one example, the mouth end segment 210 and
the cooling segment 206 may be formed of a single tube and the filter segment
208 is
located within that tube separating the mouth end segment 210 and the cooling
segment
206.
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A ventilation region 216 is provided in the article 200 to enable air to flow
into the
interior of the article 200 from the exterior of the article 200. In one
example the
ventilation region 216 takes the form of one or more ventilation holes 216
formed through
the outer layer of the article 200. The ventilation holes may be located in
the cooling
segment 206 to aid with the cooling of the article 200. In one example, the
ventilation
region 216 comprises one or more rows of holes, and optionally, each row of
holes is
arranged circumferentially around the article 200 in a cross-section that is
substantially
perpendicular to a longitudinal axis of the article 200.
In one example, there are between one to four rows of ventilation holes to
provide
ventilation for the article 200. Each row of ventilation holes may have
between 12 to 36
ventilation holes 216. The ventilation holes 216 may, for example, be between
100 to 500
pm in diameter. In one example, an axial separation between rows of
ventilation holes
216 is between 0.25 mm and 0.75 mm, optionally, an axial separation between
rows of
ventilation holes 216 is 0.5 mm.
In one example, the ventilation holes 216 are of uniform size. In another
example,
the ventilation holes 216 vary in size. The ventilation holes can be made
using any
suitable technique, for example, one or more of the following techniques:
laser
technology, mechanical perforation of the cooling segment 206 or pre-
perforation of the
cooling segment 206 before it is formed into the article 200. The ventilation
holes 216 are
positioned so as to provide effective cooling to the article 200.
In one example, the rows of ventilation holes 216 are located at least 11mm
from
the proximal end 212 of the article, optionally the ventilation holes are
located between
17mm and 20mm from the proximal end 212 of the article 200. The location of
the
ventilation holes 216 is positioned such that user does not block the
ventilation holes 216
when the article 200 is in use.
Providing the rows of ventilation holes between 17 mm and 20 mm from the
proximal end 212 of the article 200 enables the ventilation holes 216 to be
located
outside of the device 100, when the article 200 is fully inserted in the
device 100, as can
be seen in Fig. 1. By locating the ventilation holes outside of the apparatus,
non-heated
air is able to enter the article 200 through the ventilation holes from
outside the device
100 to aid with the cooling of the article 200.
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The length of the cooling segment 206 is such that the cooling segment 206
will
be partially inserted into the device 100, when the article 200 is fully
inserted into the
device 100. The length of the cooling segment 206 provides a first function of
providing a
physical gap between the heater arrangement of the device 100 and the heat
sensitive
filter arrangement 208, and a second function of enabling the ventilation
holes 216 to be
located in the cooling segment, whilst also being located outside of the
device 100, when
the article 200 is fully inserted into the device 100. As can be seen from
Fig. 1, the
majority of the cooling element 206 is located within the device 100. However,
there is a
portion of the cooling element 206 that extends out of the device 100. It is
in this portion
of the cooling element 206 that extends out of the device 100 in which the
ventilation
holes 216 are located.
Fig. 3 depicts a temperature profile 300 of a first heating element in an
aerosol
provision device, such as the first inductive heating element 114 shown in
Fig. 1B, during
an exemplary session of use 302. The temperature profile 300 suitably refers
to the
temperature profile of the first inductive heating element 114 in any mode of
operation of
the heating assembly. The temperature profile 300 of the first heating element
114 is
measured by a suitable temperature sensor disposed at the first heating
element 114.
Suitable temperature sensors include thermocouples, thermopiles or resistance
temperature detectors (RTDs, also referred to as resistance thermometers). In
a
particular embodiment, the device comprises at least one RTD. In an
embodiment, the
device comprises thermocouples arranged on each heating element 114,124
present in
the aerosol provision device. The temperature data measured by the or each
temperature sensor may be communicated to a controller. Further, it may
communicated
to the controller when a heating element 114,124 has reached a prescribed
temperature,
such that the controller may change the supply of power to elements within the
aerosol
provision device accordingly. Optionally, the controller comprises a PI D
(proportional
integral derivative) controller, which uses a control loop feedback mechanism
to control
the temperature of the heating elements based on data supplied from one or
more
temperature sensors disposed in the device. In an embodiment, the controller
comprises
a PI D controller configured to control the temperature of each heating
element based on
temperature data supplied from thermocouples disposed at each of the heating
elements.
The session of use 302 begins when the device is activated 304 and the
controller controls the device to supply energy to at least the first
induction heating unit
110. The device may be activated by a user by, for example, actuating a push
button, or
inhaling from the device. Actuating means for use with an aerosol provision
device are
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known to the person skilled in the art. In the context of a heater assembly
comprising
induction heating means, the session of use begins when the controller
instructs a
varying electrical current to be supplied to an inductor (such as first and
second coils
112,122) and thus a varying magnetic field to be supplied to the induction
heating
element, generating a rise in temperature of the induction heating element. As
mentioned
hereinabove, this may conveniently be referred to as "supplying energy to the
induction
heating unit".
The end 306 of the session of use session of use 302 occurs when the
controller
instructs elements in the device to stop supplying energy to all aerosol
generators
present in the aerosol provision device. In the context of a heater assembly
comprising
induction aerosol generators, the session of use ends when varying electrical
current
ceases to be supplied to any of the induction heating elements provided in the
heating
assembly, such that any varying magnetic field ceases to be supplied to the
induction
heating elements.
At the beginning of the smoking session 302 the temperature of the first
heating
element rapidly increases until it reaches the maximum operating temperature
308. The
time taken 310 to reach the maximum operating temperature 308 may be referred
to as
the "ramp-up" period, and has a duration of less than 20 seconds according to
various
embodiments.
The temperature of the first heating element may optionally drop from the
maximum operating temperature 308 to a lower temperature 314 later in the
session of
use 312. If the temperature drops from the maximum operating temperature 308
later in
the session of use 302, it is preferred that the temperature to which the
first heating
element drops 314 is an operating temperature. The operating temperature to
which the
first heating element drops 314 may suitable be referred to as the "second
operating
temperature" 314. Optionally, the temperature of the first heating element
does not drop
below the lowest operating temperature of the first heating element until the
end 306 of
the session of use 302. The first heating element optionally remains at or
above the
second operating temperature 314 until the end 306 of the session of use 302.
In embodiments wherein the heating assembly is operable in a plurality of
modes
(e.g. base mode and boost mode), the temperature of the first heating element
may drop
from the maximum operating temperature 308 to a second operating temperature
314 in
at least one of the modes. Optionally, the temperature of the first heating
element drops
from the maximum operating temperature 308 to a second operating temperature
314 in
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all of the operable modes. For the avoidance of doubt, the maximum operating
temperature 308 and second operating temperature 314 of the first heating
element may
differ from mode to mode.
In some examples, the second operating temperature 314 is from 180 to 240 C.
Where the heating assembly is operable in a plurality of modes, the second
operating
temperature 314 in at least one mode of operation may be from 180 to 240 C.
Optionally, the second operating temperature 314 in all modes of operating may
be from
180 to 240 C. Optionally still, the second operating temperature 314 is at
least 220 C.
In some examples, the first heating element or aerosol generator remains at or
above the
second operating temperature 314 until the end of the session of use in all
modes of
operation. Without wishing to be bound by theory, configuring the heating
assembly such
that the first heating element does not drop below 220 C until the end of the
session of
use 220 may at least partially prevent condensation from occurring in the
first portion of
the aerosol generating article during the session of use, and/or also reduce
resistance to
draw provided by the first portion of the aerosol generating article.
In these embodiments, the first heating element may remain at or substantially
close to the highest operating temperature for up to least 25%, 50%, or 75% of
the
session. For example, the first heating element may remain at its maximum
operating
temperature for a first duration of the session of use, then drop to and
remain at the
second operating temperature for a second duration of the session of use, the
first
duration being at least 25%, 50%, or 75% of the session. The first duration
may be
longer or shorter than the second duration. Optionally, in at least one mode
of operation,
the first duration is longer than the second duration. In this example, the
ratio of the first
duration to the second duration may be from 1.1:1 to 7:1, from 1.5:1 to 5:1,
from 2:1 to
3:1, or approximately 2.5:1.
In a particular embodiment, the device is operable in a plurality of modes,
and the
ratios listed above apply to the first mode of operation. In the second mode
of operation,
the first duration may be longer or shorter than the second duration.
Optionally, the
second duration is longer than the first duration. Thus, one embodiment is a
device
which is configured such that in a first mode of operation, the first duration
is longer than
the second duration, but in the second mode of operation, the second duration
is longer
than the first duration. In one embodiment, in the second mode of operation,
the ratio of
the second duration to the first duration may be from 1.1:1 to 5:1, from 1.2
to 2:1 or from
1.3:1 to 1.4:1. In another embodiment, in the second mode of operation, the
ratio of the
second duration to the first duration may be from 2:1 to 12:1, from 2.5:1 to
11:1. In
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particular, the ratio may be from 3:1 to 4:1; alternatively, the ratio may be
from 8:1 to
10:1. This embodiment may be particularly suitable for reducing the amount of
condensate formed in the device during a session of use.
It has been determined that operating the first heating element at its maximum
operating temperature for a greater proportion of the session of use may help
in reducing
the amount of condensate which collects in the device during use. This effect
may be
particularly noticeable in so-called "boost" modes of operation where the
heating unit
operates at a higher maximum operating temperature during a shorter session of
use.
The maximum operating temperature 308 may be from approximately 200 C to
300 C, or 210 00 to 290 00, or 22000 to 280 C, or, 23000 to 270 C, or 240 C
to 260
C.
Fig. 4 depicts a temperature profile 400 of a second heating element when
present in an aerosol provision device, such as the second inductive heating
element
124 shown in Fig. 1B, during an exemplary smoking session 402. Smoking session
402
corresponds to smoking session 302 shown in Fig. 3.
Fig. 4 depicts a temperature profile 400 of a second heating element when
present in an aerosol provision device, such as the second inductive heating
element
124 shown in Fig. 1B, during an exemplary session of use 402. Session of use
402
corresponds to session of use 302 shown in Fig. 3. The temperature profile 400
suitably
refers to the temperature profile of the second inductive heating element 124
in any
mode of operation of the heating assembly.
The session of use 402 begins when the device is activated 404 and energy is
supplied to at least the first induction heating unit. In this example, the
controller is
configured not to supply energy to the second induction heating unit at the
start of the
session of use 402. Nevertheless, the temperature at the second induction
heating
element will likely rise somewhat due to thermal "bleed" ¨ conduction,
convection and/or
radiation of thermal energy from the first heating element 114 to the second
heating
element 124.
At a first programmed time point 406 after the beginning of the session of
use, the
controller instructs energy to be supplied to the second heating unit 120 and
the
temperature of the second heating element 124 rises rapidly until the time
point 408 at
which a predetermined first operating temperature 410 is reached, then the
controller
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controls the second heating unit 120 such that the second heating element 124
remains
at substantially this temperature for a further period of time. The
predetermined first
operating temperature 410 may be lower than the maximum operating temperature
412
of the second heating element 124. In other embodiments (not shown), the first
predetermined operating temperature is the maximum operating temperature; that
is, the
second heating element 124 is directly heated to its maximum operating
temperature
upon activation of the second heating unit 120.
In some embodiments, the predetermined first operating temperature 410 is from
150 C to 200 C. The predetermined first operating temperature 410 may be
greater
than 150 C, 160 C, 170 C, 180 C, or 190 C. The predetermined first
operating
temperature 410 may be less than 200 C, 190 C, 180 C, 170 C, or 160 'C.
Optionally,
the predetermined first operating temperature 410 is from 150 C to 170 C. A
lower first
operating temperature 410 may help to reduce the amount of undesirable
condensate
which collects in the device.
In embodiments wherein the heating assembly is operable in a plurality of
modes,
the heating assembly may be configured such that the second heating element
124 rises
to a first operating temperature 410, maintains the first operating
temperature 410, then
subsequently rises to the maximum operating temperature 412, in at least one
mode.
Optionally, the heating assembly is configured such that the second heating
element 124
rises to a first operating temperature 410, maintains the first operating
temperature 410,
then subsequently rises to the maximum operating temperature 412 in all
operable
modes.
The first programmed time point 406 at which power is first supplied to the
second heating unit 120 may be at least approximately 10 seconds, 20 seconds,
30
seconds, 40 seconds, 50 seconds, or 60 seconds after activation of the device
404. For
embodiments wherein the heating assembly is operable in a plurality of modes,
the first
programmed time point 406 is at least approximately 10 seconds, 20 seconds, 30
seconds, 40 seconds, 50 seconds, 60 seconds, 70 seconds, or 80 seconds after
activation of the device 404 in at least one mode. Optionally, the first
programmed time
point 406 is at least approximately 10 seconds, 20 seconds, 30 seconds, 40
seconds, 50
seconds, 60 seconds, 70 seconds, or 80 seconds after activation of the device
404 in all
operable modes. The first programmed time point 406 may be the same in each
mode,
or it may differ between modes. Optionally, the first programmed time point
406 differs
between the modes. In particular, the first programmed time point 406 may be
at a later
point in the session of use in the first mode than in the second mode.
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In some embodiments, the heating assembly 100 may be configured such that
the second induction unit 120 rises to the predetermined operating temperature
410
within 10 seconds, or 5 seconds, 4 seconds, 3 seconds or 2 seconds of the
programmed
time point 406 for increasing the temperature of the second induction heating
element
124 to the first predetermined operating temperature 410. Put another way, the
period
414 between the two time points 406, 408 may have a duration of 10 seconds or
less, 5
seconds or less, 4 seconds or less, 3 seconds or less, or 2 seconds or less.
Optionally,
the period 414 has a duration of 2 seconds or less.
The second heating element 124 may be kept at the predetermined first
operating
temperature 410 for a predetermined period of time until a second programmed
time
point 416 at which the controller controls the second heating unit such that
the second
heating element 124 rises to its maximum operating temperature 412. At this
second
programmed time point 416 the temperature of the second heating element 124
rises
rapidly until the time point 418 at which the maximum operating temperature
412 is
reached. Then, the controller controls the second heating unit such that the
second
heating element 124 remains at substantially this temperature for a further
period of time.
The second programmed time point 416 may be at least approximately 10
seconds, 20 seconds, 30 seconds, 40 seconds, 50 seconds, or 60 seconds after
activation of the device 404.
In some embodiments, the heating assembly 100 may be configured such that
the second induction element 124 rises from the first predetermined operating
temperature 410 to the maximum operating temperature 412 within 10 seconds, or
5
seconds, 4 seconds, 3 seconds or 2 seconds of the programmed time point 416
for
increasing the temperature of the second induction heating element 124 to the
maximum
operating temperature 412. Put another way, the period 420 between the two
time points
416, 418 may have a duration of 10 seconds or less, 5 seconds or less, 4
seconds or
less, 3 seconds or less, or 2 seconds or less. Optionally, the period 420 has
a duration of
2 seconds or less.
The temperature of the second heating element in the period from timepoint 416
to timepoint 418 may rise at a rate of at least 50 00 per second, or 100 C
per second, or
150 C per second.
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In some embodiments the heating assembly 100 may be configured such that the
second induction heating element 124 reaches the maximum operating temperature
412
after at least approximately 30 seconds, 40 seconds, 50 seconds, 60 seconds,
80
seconds, 100 seconds, or 120 seconds from activation of the device 404.
Optionally, the
heating assembly 100 is configured such that the second induction heating
element 124
reaches the maximum operating temperature 412 after at least approximately 120
seconds after activation of the device 404.
In some embodiments, the heating assembly 100 may be configured such that
the second induction heating element 124 reaches the maximum operating
temperature
412 after at least approximately 10 seconds, 20 seconds, 30 seconds, 40
seconds, 50
seconds, 60 seconds, 80 seconds, 100 seconds, or 120 seconds from the first
induction
heating element 122 reaching its maximum operating temperature 308. Optionally
the
heating assembly 100 is configured such that the second induction heating
element 124
reaches its maximum operating temperature 412 after at least approximately 120
seconds from the first induction heating element 122 reaching its maximum
operating
temperature 308. Put another way, with reference to Figures 3 and 4, time
point 418 may
be at least 120 seconds later than time point 310 during the smoking session
302, 402.
The second heating element 124 may be kept at its maximum operating
temperature 412 for a predetermined period of time until the end of the
smoking session
422, at which point the controller controls the heating assembly such that
energy ceases
to be supplied to all heating elements present in the aerosol provision
device. Optionally,
after the temperature of the second heating element 124 has reached an
operating
temperature (roughly around the first predetermined time point 406), the
temperature of
the second heating element 124 does not drop below the lowest operating
temperature
424 of the second heating element 124 until the end of the smoking session
402.
In embodiments wherein the first heating element 122 drops from a maximum
operating temperature 308 to a lower temperature later in the smoking session,
the
second heating element 124 may reach its maximum operating temperature 412
before
the temperature drop of the first heating element 122, after the temperature
drop of the
first heating element 122, or concurrent with the temperature drop of the
first heating
element 122. In an embodiment, the second heating element 124 reaches its
maximum
operating temperature 412 before the first heating element 122 drops from its
maximum
operating temperature 308 to a lower temperature.
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In some embodiments, the maximum operating temperature 308 of the first
heating element 122 is substantially the same as that of the second heating
element 124.
In other embodiments the maximum operating temperatures 308, 412 of the first
and
second heating elements 122, 124 may differ. For example, the maximum
operating
temperature 308 of the first heating element 122 may be greater than that of
the second
heating element 124, or the maximum operating temperature 412 of the second
heating
element 124 may be greater than that of the first heating element 122. In one
embodiment, the maximum operating temperature 308 of the first heating element
122 is
greater than the maximum operating temperature 412 of the second heating
element
124. In another embodiment, the maximum operating temperature 308 of the first
heating
element 122 is substantially the same as that of the second heating element
124.
For periods during which a heating element remains at a substantially constant
temperature, there may be minor fluctuations in the temperature around the
target
temperature defined by the controller. In some embodiments, the fluctuation is
less than
approximately 10 C, or 5 C, or 4 C, or 3 C, or 2 C, or 1 'C.
Optionally the
fluctuation is less than approximately 3 C for at least the first heating
element, at least
the second heating element, or both the first heating element and second
element.
Figs 3 and 4 discussed hereinabove reflect the measured or observed
temperature profile of heating unit(s) present in the device 100. Fig. 5
reflects a
programmed heating profile of any heating unit(s) present in the device 100.
Any
programmed heating profile of any heating unit present in the heating assembly
of the
present device may be depicted by the general programmed heating profile as
shown in
Fig. 5.
A programmed heating profile 500 includes a first temperature, temperature A
502. Temperature A 502 is the first temperature which the heating unit is
programmed to
reach during a given session of use, at timepoint A 504. Timepoint A 504 may
conveniently be defined in terms of the number of seconds elapsed from the
start of a
session of use, i.e. from the point at which power is first supplied to at
least one heating
unit present in the heating assembly.
Optionally, a programmed heating profile 500 may include a second temperature,
temperature B 506. Temperature B 506 is a temperature different to temperature
A 502.
In some embodiments, the device is programmed to reach temperature B 506
during a
given session of use at timepoint B 508. Timepoint B 508 occurs temporally
after
timepoint A 504.
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From timepoint A 504 to timepoint B 508, the device is programmed to have
substantially the same temperature, temperature A 502. However, in some
embodiments,
there may be variation about temperature A 502 in this period. For example,
the heating
unit may have a temperature within 10 C of temperature A 502 during this
period,
optionally within 5 C of temperature A 502 during this period. Such profiles
are still
considered to correspond to the profile shown generally in Fig. 5. In other
embodiments,
there is substantially no variation from temperature A 502 during this period.
Even though Fig. 5 depicts temperature B 506 being higher than temperature A
502, the programmed heating profiles of the present disclosure are not so
limited:
temperature B 506 may be higher or lower than temperature A 502 for any given
heating
profile.
Optionally, a programmed heating profile 500 includes a second temperature,
Temperature B 506.
Optionally, a programmed heating profile 500 may include a third temperature,
temperature C 510. Temperature C 510 is a temperature different to temperature
B. In
some embodiments, the device is programmed to reach to temperature C 510
during a
given session of use at timepoint C 512. Timepoint C 512 occurs temporally
after
timepoint B 508 and thus timepoint A 502.
Temperature C 510 may or may not be the same temperature as temperature A
502.
Even though Fig. 5 depicts temperature C 510 being higher than temperature B
506 and temperature A 502, the programmed temperature profiles of the present
disclosure are not so limited: temperature C 510 may be higher or lower than
temperature A 502 for any given heating profile; temperature C 510 may be
higher or
lower than temperature B 506 for any given heating profile.
The programmed heating profile 500 includes a final timepoint 514, the point
at
which energy stops being supplied to the heating unit for the rest of the
session of use. It
may be that the final timepoint 514 is concurrent with the end of the session
of use.
Surprisingly, it has been found that the temperatures 502, 506, 510 and
timepoints 504, 508, 512, 514 of the programmed heating profile of the heating
unit(s)
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may be modulated to reduce the accumulation of condensation in a device 100.
In
particular, configuring the device such that timepoint B 508 occurs after 50%
of the
session of use has elapsed, optionally after 75% of the session of use has
elapsed, may
reduce the amount of condensate which collects in the device in use.
In embodiments wherein the heating assembly comprises at least two aerosol
generators, the heating assembly may be configured such that the first and
second
aerosol generators have substantially the same maximum operating temperature.
The
inventors have identified that this configuration may also reduce the
accumulation of
condensation in the device.
Fig. 6 shows an embodiment wherein an aerosol generating article 600
comprising aerosol generating material 605 is inserted into an aerosol
provision device
601.
Various different embodiments are contemplated wherein the aerosol provision
device 601 may comprise a mixture of both external heating unit(s) (or more
generally
external aerosol generator(s)) and internal heating unit(s) (or more generally
internal
aerosol generator(s)). An external heating unit will be understood as
comprising a
heating unit which surrounds an aerosol generating article 600 and directs
heat into the
outer portion of the aerosol generating article 600 which then heats the
remaining portion
of the aerosol generating article 600. The external heating unit(s) may
comprise an
induction heating unit(s) and/or a resistive heating unit(s).
By way of contrast, an internal heating unit comprises a heating unit which
enters
into or which is provided within the main body of the aerosol generating
article 600. For
example, an internal heating unit may comprise a blade 606 provided in the
base of a
heating chamber of the aerosol provision device 601. The aerosol generating
article 600
when inserted into the aerosol provision device 601 will be pushed down onto
the blade
606 with the result that the blade 606 extends into the distal end of the
aerosol
generating article 600. According to various embodiments the internal heating
unit(s)
may comprise resistive heating units wherein an electrical current is passed
through the
heating unit in order to heat the heating unit. However, other embodiments are
contemplated wherein the internal heating unit(s) may comprise induction
heating unit(s).
An induction heating unit may comprise an induction coil for generating a time
varying
magnetic field and a susceptor. The induction coil and the susceptor are
suitably
relatively positioned so that the varying magnetic field produced by the
inductor
penetrates the susceptor and one or more eddy currents are generated inside
the
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susceptor. The susceptor has a resistance to the flow of electrical current,
so when such
eddy currents are generated in the susceptor, their flow against the
electrical resistance
of the susceptor causes the susceptor to be heated by Joule heating. For
example, a
susceptor may be provided in the base of a heating chamber of the aerosol
provision
device 601 such that the aerosol generating article 600 is pushed onto the
susceptor
when the aerosol generating article 600 is inserted into the aerosol provision
device 601.
The susceptor may then be heated by an induction coil which may be spaced at a
distance from the internal susceptor.
The aerosol provision device 601 may comprise one or more external aerosol
generators 602,603,604 arranged to cause aerosol to be generated from the
aerosol
generating material 605. The aerosol provision device 601 may further comprise
one or
more internal aerosol generators 606 arranged to cause aerosol to be generated
from
the aerosol generating material 605.
A controller is provided for controlling the one or more external 602,603,604
and
the one or more internal aerosol generators 606. In particular, the controller
is arranged
to set a desired heating profile for the one or more external and internal
aerosol
generators.
The controller may be operable in a first mode of operation to activate the
one or
more external aerosol generators 602,603,604 without activating the one or
more internal
aerosol generators 606 during a session of use and the controller may also be
operable
in a second mode of operation to activate the one or more internal aerosol
generators
606 without activating the one or more external aerosol generators 602,603,604
during a
session of use. Accordingly, according to an embodiment an aerosol generating
article
600 may be heated during a session of use either by external heating or by
internal
heating. It is contemplated, for example, that different types of consumable
or aerosol
generating article 600 may be inserted into the aerosol provision device 601
and that it
may be desired to heat the different types of consumable or aerosol generating
article
600 differently dependent upon e.g. the composition of the consumable or
aerosol
generating article 600 or the preference of the user.
Embodiments are contemplated wherein the composition of the consumable or
aerosol generating article 600 may vary across the diameter of the consumable
or
aerosol generating article 600. In such an embodiment, it may be desired to
generate
aerosol initially from smokable material which is located centrally within the
consumable
or aerosol generating article 600. Accordingly, the controller may be operated
in a mode
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of operation wherein one or more internal aerosol generators are activated
without
activating one or more external aerosol generators. As a result, heat may
initially be
applied internally within the consumable or aerosol generating article 600
such that
smokable material located centrally within the consumable or aerosol
generating article
600 is initially heated and caused to generate aerosol. As a session of use
progresses,
then heat from the internal heating unit is transmitted radially outwards so
as to heat the
outer portions of the consumable or aerosol generating article 600 with the
result that
aerosol is now generated from the smokable material which is located towards
the
outermost part of the consumable or aerosol generating article 600.
In the first mode of operation the controller may be arranged to set a first
heating
profile having a first duration for the one or more external aerosol
generators
602,603,604 and in the second mode of operation the controller may be arranged
to set
a second heating profile having a second duration for the one or more internal
aerosol
generators 606.
According to an embodiment the first and second heating profiles are the same.
Alternatively, the first and second heating profiles may be different.
It is contemplated, for example, that according to an embodiment a user may
wish to enjoy a first puff as quickly as possible after initialising the
aerosol provision
device 601. In this situation, the controller may activate whichever heating
unit or
aerosol generator is considered to be the most the effective in reducing the
time to first
puff.
According to an embodiment the first and second durations are the same. It is
contemplated, therefore, that the duration of the heating profile which is set
for the
heating unit(s) or aerosol generator(s) is the same irrespective of whether an
external
heating unit is activated or an internal heating unit is activated.
Alternatively, the first and second durations may be different. For example,
if the
controller is operated in a mode of operation wherein the one or more external
aerosol
generators are activated then the duration of the heating profile may be a
first
predetermined length. If the controller is instead selected to operate in a
mode of
operation wherein one or more internal aerosol generators are activated then
the
duration of the heating profile which is set for the one or more internal
aerosol generators
may be shorter (or longer) than the first predetermined length.
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According to another embodiment the controller may be operable in a mode of
operation to activate the one or more external aerosol generators 602,603,604
initially
without activating the one or more internal aerosol generators 606 and then to
activate
the one or more internal aerosol generators 606 without activating the one or
more
external aerosol generators 602,603,604 during a session of use. For example,
it may
be determined that a desired sensorial experience may best be achieved by
using an
external heating unit 602,603,604 to initially heat the aerosol generating
article 600. The
external heating unit 602,603,604 might, for example, comprise an induction
heating unit
602,603 which is capable of raising the temperature of the aerosol generating
material
605 faster than a resistive heating unit. As a result, by initially activating
an external
heating unit aerosol may be generated from the aerosol generating material 605
in a
rapid manner. Once aerosol has started to be generated it may be desired to
generate
aerosol from smokable material located around the central core of the aerosol
generating
article 600. Accordingly, the controller may then switch OFF the external
induction
heating unit 602,603 and switch ON an internal heating unit. For example, as
shown in
Fig. 6 the internal heating unit or aerosol generator may comprise a resistive
heating unit
606. However, other embodiments are contemplated wherein the internal heating
unit
may comprise an induction heating unit.
Alternatively, the controller may be operable to activate the one or more
internal
aerosol generators 606 initially without activating the one or more external
aerosol
generators 602,603,604 and then to activate the one or more external aerosol
generators
602,603,604 without activating the one or more internal aerosol generators 606
during a
session of use.
The one or more external aerosol generators may comprise one or more
induction aerosol generators. In the example shown in Fig. 6 a first external
heating unit
is shown which comprises an induction heating unit comprising an inductor coil
602 and
a susceptor 603.
The one or more external aerosol generators may comprise one or more resistive
or non-induction aerosol generators. In the example shown in Fig. 6 a second
external
heating unit is shown which comprises a resistive heater 604.
The one or more internal aerosol generators may comprise one or more induction
aerosol generators.
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The one or more internal aerosol generators may comprise one or more resistive
or non-induction aerosol generators. In the example shown in Fig. 6 an
internal heating
unit is shown comprising a resistive blade heater 606 connected to a power
supply 607.
The one or more external aerosol generators may comprise a first external
heating unit and a second external heating unit. For example, as shown in Fig.
6 a first
external heating unit may be provided which may comprise an induction heating
unit
602,603 and a second external heating unit may be provided which may comprise
a
resistive heater 604.
The one or more internal aerosol generators may comprise a first internal
heating
unit and a second internal heating unit. In the example shown in Fig. 6 a
single internal
heating unit 606 is shown. However, according to various embodiments a second
internal heating unit may be provided. For example, a second internal
resistive heater
may be provided or an internal induction heating unit may also be provided.
According to another embodiment the aerosol provision device 601 may comprise
one or more induction aerosol generators arranged to cause aerosol to be
generated
from the aerosol generating material 605 and one or more resistive or non-
induction
aerosol generators arranged to cause aerosol to be generated from the aerosol
generating material 605.
The controller is provided for controlling the one or more induction and
resistive
or non-induction aerosol generators. The controller is operable in a first
mode of
operation to activate one or more induction aerosol generators without
activating the one
or more resistive or non-induction aerosol generators during a session of use
and the
controller is also operable in a second mode of operation to activate the one
or more
resistive or non-induction aerosol generators without activating one or more
induction
aerosol generators during a session of use.
In the first mode of operation the controller sets a first heating profile
having a first
duration for one or more induction aerosol generators and in the second mode
of
operation the controller sets a second heating profile having a second
duration for the
one or more resistive or non-induction aerosol generators.
The first and second heating profiles may be the same. Alternatively, the
first and
second heating profiles may be different.
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The first and second durations may be the same. Alternatively, the first and
second durations may be different.
According to another embodiment the aerosol provision device 601 comprises
one or more induction aerosol generators arranged to cause aerosol to be
generated
from the aerosol generating material 603 and one or more resistive or non-
induction
aerosol generators arranged to cause aerosol to be generated from the aerosol
generating material 603.
A controller is provided for controlling the one or more induction and
resistive or
non-induction aerosol generators. The controller is operable in a mode of
operation
either: (i) to activate one or more induction aerosol generators initially
without activating
the one or more resistive or non-induction aerosol generators and then to
activate the
one or more resistive or non-induction aerosol generators without activating
one or more
induction aerosol generators during a session of use; or (ii) to activate the
one or more
resistive or non-induction aerosol generators initially without activating one
or more
induction aerosol generators and then to activate one or more induction
aerosol
generators without activating the one or more resistive or non-induction
aerosol
generators during a session of use.
The one or more induction aerosol generators may comprise one or more
external aerosol generators.
The one or more induction aerosol generators may comprise one or more internal
aerosol generators.
The one or more resistive or non-induction aerosol generators may comprise one
or more external aerosol generators.
The one or more resistive or non-induction aerosol generators may comprise one
or more internal aerosol generators.
The one or more induction aerosol generators may comprise a first induction
heating unit and a second induction heating unit.
The one or more resistive or non-induction aerosol generators may comprise a
first resistive or non-induction heating unit and a second resistive or non-
induction
heating unit.
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The aerosol provision device 601 may further comprise a user interface
arranged
to detect an input from a user, wherein the user interface is arranged to
select the mode
of operation of the controller.
The aerosol provision device 601 may further comprise a first device for
automatically recognising an aerosol generating article 600 inserted into the
aerosol
provision device 601, wherein the first device is arranged to select the mode
of operation
of the controller.
A session of use may be determined to begin when power or energy is first
supplied to the one or more heating units or aerosol generators after an
aerosol
generating article 600 has been inserted into the aerosol provision device
601.
A session of use may be determined to begin when power or energy is first
supplied to the one or more heating units or aerosol generators in order to
raise the
temperature of the one or more heating units or aerosol generators to an
operating
temperature Tmin such that a user can take a first puff of aerosol generated
from the
aerosol generating material 605. According to an embodiment Tmin is in the
range: (i)
200-210 C; (ii) 210-220 C; (iii) 220-230 C; (iv) 230-240 C; (v) 240-250
C; (vi) 250-260
C; (vii) 260-270 C; (viii) 270-280 C; (ix) 280-290 C; and (x) 290-300 C.
A session of use may be determined to end when power or energy is no longer
supplied to the one or more heating units or aerosol generators.
A session of use may be determined to end when the aerosol generating material
605 is substantially spent or wherein a user is unable to take further puffs
of aerosol
generated from the aerosol generating material 605.
A session of use may be determined to relate to a period of time during which
a
user is enabled to take multiple puffs of aerosol generated from aerosol
generating
material 605 without replacement or replenishment of the aerosol generating
material
605.
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,
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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.
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