Note: Descriptions are shown in the official language in which they were submitted.
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DESCRIPTION
CARBONACEOUS HEAT SOURCE COMPOSITION
FOR NON-COMBUSTION TYPE SMOKING ARTICLE
AND NON-COMBUSTION =TYPE SMOKING ARTICLE
Technical Field
The present invention relates to a carbonaceous
heat source composition for a non-combustion type
smoking article and to a non-combustion type smoking
article.
Background Art
Tobacco is a typical flavor generating material
for tasting flavor in the smoke (aerosol) generated by
combusting tobacco leaves through the sense of taste
and sense of smell of human.
In recent years, in place of or in addition to
tobacco, non-combustion type smoking articles have been
developed for enjoying flavor and taste of tobacco and
for enjoying aerosol without combusting tobacco leaves.
These non-combustion type smoking articles comprise a
heat source which is a heat-generating member mounted
on the tip and an aerosol-generating section including
an aerosol-generating material formed of an appropriate
substrate on which a flavoring component is carried.
The heat source is physically separated from the
aerosol-generating section. In the smoking articles of
this type, the heat source is combusted, and the heat
of combustion heats the aerosol-generating member
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without combustion to generate an aerosol containing
the flavoring component. Smokers inhale the aerosol to
enjoy the flavor. As the heat source, a carbonaceous
heat source is exclusively used.
Many conventional non-combustion type smoking
articles provide smaller amount of aerosol in smoking
than that provided by an ordinary cigarette and fail to
provide satisfaction of smoking. Thus, there is a
proposal to increase the amount of aerosol to be
generated.
Jpn. Pat. Appin. KOKAI Publication No. 5-207868
discloses a carbonaceous fuel composition for fuel
element which includes carbon, a binder, tobacco and
sodium. By the addition of sodium to the fuel
composition, smoldering speed and puff calorie are
improved and the yield of aerosol to be generated is
improved.
However, if the amount of sodium to be added is
increased in this carbonaceous fuel composition, the
yield of aerosol is increased whereas the amount of
carbon monoxide is considerably increased.
Disclosure of Invention
It is an object of the present invention to
provide a carbonaceous heat source composition for a
non-combustion type smoking article which can increase
the amount of aerosol to be generated while minimizing
an increase in the amount of carbon monoxide to be
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generated by the combustion of the heat source, and
also to provide a non-combustion type smoking article
comprising the heat source constituted of the
composition.
For achieving the above object, a first aspect of
the present invention provides a carbonaceous heat
source composition for a non-combustion type smoking
article characterized by comprising carbon and 0.5 to
5% by weight of a polyhydric alcohol.
The present invention as claimed is however more specifically directed to a
non-combustion type smoking article comprising:
an aerosol-generating section which generates aerosol by heating; and
a carbonaceous heat source provided at an end of the aerosol-generating
section so as to be physically separated from the aerosol-generating section
in
order to heat the aerosol-generating section without substantially combusting
the
aerosol-generating section,
wherein the carbonaceous heat source comprises carbon, 1.0 to 5% by
weight of a polyhydric alcohol based on a total weight of the carbonaceous
heat
source and 30 to 55% by weight of calcium carbonate based on the total weight
of
the carbonaceous heat source.
Brief Description of Drawings
FIG. 1 is a cross-sectional view illustrating an
example of a non-combustion type smoking article.
FIG. 2 is a graph showing the relationship between
the glycerin content and the percentage increase in TPM
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or the ignition improvement rate.
Best Mode for Carrying Out the Invention
The present invention will be described in more
detail hereinafter.
A carbonaceous heat source composition for a non-
combustion type smoking article according to the
present invention comprised carbon and 0.5 to 5% by
weight of a polyhydric alcohol based on the total
weight of a carbonaceous heat source composition. If
the amount of the polyhydric alcohol is less than 0.5%
by weight, the amount of generated aerosol (TPM) does
not increase significantly. Also, if the amount of the
polyhydric alcohol exceeds 5% by weight, the percentage
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increase in carbon monoxide (CO) generated by the
combustion of a heat source increases. In particular,
when the polyhydric alcohol is contained in an amount
of 1.0% by weight or more (5% by weight or less), the
heat source formed from the composition is
significantly improved in ignitability. Also, if the
heat source comprising a polyhydric alcohol in an
amount of 1.0% by weight or more (5% by weight or less)
is used, the amount of TPM increases more.
As the polyhydric alcohol, glycerin, propylene
glycol or the like may be used.
Generally, the carbonaceous heat composition of
the present invention contains a binder for binding
carbon in addition to the polyhydric alcohol and
carbon. The amount of the binder is preferably 5 to
15% by weight based on the total weight of the
carbonaceous heat source composition. When the amount
of the binder is less than 5% by weight, there is a
tendency that the binding ability of the binder is
exhibited insufficiently. Also, when the amount of the
binder exceeds 15% by weight, the amount of carbon is
reduced, with the result that there is a tendency that
the heat source is insufficiently combusted.
As the binder, an alginate (for example, an
ammonium salt and sodium salt), carboxymethyl cellulose
or its salt (for example a sodium salt), pectin and
carrageenan or its salt (for example, a sodium salt),
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guar gum or the like may be used.
Moreover, the carbonaceous heat source composition
of the present invention may contain calcium carbonate
(particles). Calcium carbonate is, when formulated,
5 preferably formulated in a ratio of 30 to 55% by weight
based on the total weight of the carbonaceous heat
source composition. When the amount of calcium
carbonate is less than 30%, there is a tendency that
the effect of suppressing combustion is insufficiently
developed. Also, when the amount of calcium carbonate
exceeds 55% by weight, the number of puffs of the
smoking article is significantly reduced and therefore
such a carbonaceous heat source is practically
unacceptable.
The carbonaceous 'heat source=composition of the
present invention comprises 0.5 to 5% by weight of a
polyhydric alcohol as mentioned above and the balance
is carbon, including the case where the heat sauce
further contains a binder and (or) calcium carbonate.
The source (raw material) of carbon (particles) is not
particularly limited, and any known carbons can be
used.
The carbonaceous heat source composition of the
present invention may be molded as the heat source by
molding technology such as extrusion molding. At this
time, the polyhydric alcohol may be blended with other
raw materials in advance prior to molding, or may be
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supplied to other raw materials using another method in
which a nozzle for supplying the polyhydric alcohol is
attached to the mixing/kneading part of the molding
machine to supply the polyhydric alcohol from this
nozzle in the molding using the molding machine.
The non-combustion type smoking article of the
present invention comprises an aerosol-generating
section generating aerosol by heating and a heat source
provided at an end of the aerosol-generating section so
as to be physically separated from the aerosol-
generating section, wherein the heat source is
constituted of the carbonaceous heat source composition
of the present invention. Since the smoking article of
the present invention is a non-combustion type, a
burning line, which occurs during combustion and is
observed in the case of using a combustion type smoking
article, does not exist in the aerosol-generating
section at all.
The non-combustion type smoking article of the
present invention can increase TPM by, for example,
16.0% or more while suppressing the percentage increase
in carbon monoxide by, for example, 5% or less as
compared with a non-combustion type smoking article
using a carbonaceous heat source containing no
polyhydric alcohol.
In particular, a heat source comprising a
polyhydric alcohol in a ratio of 1.0 to 5% by weight
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can be improved in ignition time by 11% or more than a
carbonaceous heat source comprising no polyhydric
alcohol.
An example of the non-combustion type smoking
article of the present invention will be described with
reference to FIG. 1.
.A non-combustion type smoking article 10
illustrated in FIG. 1 comprises an aerosol-generating
section 11, which generates an aerosol containing a
flavoring component by heating. In the example
illustrated in FIG. 1, the aerosol-generating section
11 is composed of a first aerosol-generating portion
111 and a second aerosol-generating portion 112. The
first aerosol-generating portion 111 comprises a hollow
cylinder made of a thermally stable material such as
aluminum or stainless steel (not shown), in which sheet
tobacco shreds or tobacco shreds, for example, are
filled. The second aerosol-generating portion 112
comprises a similar hollow cylinder (not shown) in
which tobacco shreds, for example, are filled. The
first aerosol-generating portion 111 and the second
aerosol-generating portion 112 are in contact with each
other and positioned in the longitudinal direction of
the smoking article 10.
A cylindrical carbonaceous heat source 12 formed
of the composition of the present invention is provided
at the front end of the aerosol-generating section 11
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(the front end of the first aerosol-generating part
111) so as to be physically separated from the aerosol-
generating section 11. A through-hole 121 for taking
in the outer air is formed within the heat source 12 in
the axial direction. The outer periphery of the heat
source 12 is generally surrounded by a heat resistant
member 13 consisting of, for example, glass wool. An
ordinary filter 14 may be provided at the rear end of
the aerosol-generating section 11 (the rear end of the
second aerosol-generating portion 112). The whole
outer peripheries of the aerosol-generating section 11
and the filter 14 and a part of the outer periphery of
the heat source 12 surrounded by the heat resistant
member 13 are wrapped by a wrapping material 15 made of
a heat insulating material to be integrated. Such non-
combustion type smoking article may have an outer
appearance of the ordinary cigarette.
The present invention will be described below by
way of Examples, but the present invention is not
limited thereto.
Examples 1 to 4, Comparative Example 1
As shown in Table 1, a carbonaceous heat source
was molded from a composition containing glycerin (0.5
to 5% by weight), carbon (45.0 to 49.5% by weight),
ammonium alginate (10% by weight) which was a binder
and calcium carbonate (40% by weight). Using this
carbonaceous heat source, a smoking article having the
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construction shown in FIG. I was fabricated. As
Comparative Example 1, a smoking article was fabricated
in the same manner as above using a carbonaceous heat
source to which no glycerin was added. These smoking
articles were respectively subjected to a smoking
combustion by an automatic smoking machine under the
standard smoking condition (TIOJ standard measuring
method [fourth Edition] attachment 1) to measure the
amounts of generated TPM and CO and the number of
puffs.
Also, with regard to the smoking articles of
Examples 1 to 4 and Comparative Example 1, the ignition
time of the heat source was measured. The condition of
the first puff was optionally set under the condition
that the amount of air to be drawn was 2 seconds/35 cc,
to ignite the smoking article by using a cigar lighter.
When the whole end surface of the heat source was
combusted at the second puff under the standard smoking
condition (TIOJ standard measuring method [fourth
Edition] attachment 1) and this combustion of the whole
end surface was observed five or more times after the
second puff, the set value of the first puff was
defined as the ignition time.
The results of the above test are shown in Table
2. Table 2 also shows the results of the percentage
increase in TOM, percentage increase in CO and ignition
improvement rate which are calculated based on the
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amounts of generated TPM and CO, and the ignition time
in Comparative Example 1. Furthermore, a graph showing
the relationship between the glycerin content, and the
percentage increase in TPM or the ignition improvement
5 rate is shown in FIG. 2. In FIG. 2, the line a shows
the percentage increase in TPM and the line b shows the
ignition improvement rate.
,
Tabel 1: Composition of the carbonaceous heat source composition
Calcium
Carbon Binder Glycerin
Total
carbonate
n
(% by weight) (% by weight) (% by weight) (%
by weight)
(% by weight)
0
I.)
m
Comparative
.1.
50.0 40.0 10.0 0 100
ko
w
Example 1
H
li)
Example 1 , 49.5 40.0 10.0 0.5
100 I.)
0
1--,
0
Example 2 49.0 40.0 10.0 1.0
100 1¨ 0
I
H
0
Example 3 47.0 40.0 10.0 3.0
100 0
,
0
Example 4 45.0 40.0 10.0 5.0
100
,
,
Table 2 : Glycerin content, ignition time, components in mainstream smoke
and the number of puffs.
Percentage
Ignition Amount of
Amount of Percentage Number
Glycerin Ignition increase
improvement generated generated
increase of 0
content time in
rate TPM
CO in CO puff 0
N
(% by weight) (sec) TPM
m
(%) (mg/article)
(mg/article) (%) (times) a,
ko
(%)
w
_
H
li)
Comparative
I.)
0 1.8 - 0.67 -
2.3 - 7 0
0
Example 1
co
Example 1 0.5 1.8 0 0.78 16.4
2.3 0 7 N) H
0
I
_
0
Example 2 1.0 1.6 11.1 0.87 29.9
2.4 0 7 co
_,.
Example 3 3.0 1.6 11.1 0.90 34.3
2.4 4.3 7
_ _
Example 4 5.0 1.5 16.7 0.91 35.8
2.2 -4.3 7
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As is shown by the above results, the smoking
articles of Examples 1 to 4 using carbonaceous heat
sources obtained from carbonaceous heat source
compositions containing glycerin in a ratio of 0.5 to
5% by weight provide increased amount of generated TPM
by 16.4% or more (maximum of 35.8%) than the smoking
article of Comparative Example 1 using a carbonaceous
heat source containing no glycerin. Also, the smoking
articles of Examples 1 to 4 show substantially no
increase in the amount of CO. Also, the amount of
generated TPM is increased as the glycerin content is
increased in the range from 0.5% by weight (Example 1)
to 5% by weight (Example 4). In particular, when the
glycerin content is 1.0% by weight or more, the amount
of generated TPM is significantly increased (Examples 2
to 5). Moreover, the ignition time is improved by 11.1
to 16.7% when the glycerin content is 1% or more
(Examples 2 to 5). The sample in which the glycerin
content is 0.5% (Example 1) is improved in the
percentage increase in TPM by 16.4% though the ignition
time is not improved.
Specifically, the amount of generated TPM can be
increased by adding glycerin while suppressing the
increase in the amount of generated CO by controlling
the amount of carbon in the heat source composition.
As is clear from FIG. 2, even if glycerin is added
in an amount exceeding 5%, the percentage increase in
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T PM is not largely improved and also, there is a fear
that glycerin in an amount exceeding 5% increases
pyrolysates, which is undesirable.
According to the present invention, as described
above, a simple construction is adopted in which the
amount of a polyhydric alcohol is set to be in a range
from 0.5 to 5% by weight in the carbonaceous heat
source composition for a non-combustion type smoking
article, whereby the amount of aerosol generated from
the aerosol-generating member can be increased while
minimizing increase in the amount of generated carbon
monoxide by the combustion of the heat source.
Of course, the scope of the claims should not be limited by the preferred
embodiments set forth in the examples, but should be given the broadest
interpretation consistent with the description as a whole.
