Note: Descriptions are shown in the official language in which they were submitted.
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D E S C R I P T I 0 N
CIGARETTE WITH THE AMOUNT OF SIDESTREAM SMOKE REDUCED
Technical Field
The present invention relates to a cigarette whose
sidestream smoke amount reduced, and more specifically
to a cigarette wrapped with an inner wrapper paper
sheet and an outer wrapper paper sheet.
Background Art
Various techniques have been proposed in order to
reduce the amount of sidestream smoke of cigarettes.
For example, Japanese Patent No. 2572488 discloses a
cigarette wrapped with an inner wrapper paper sheet
having an air permeability of 1 to 5 CORESTA units and
containing 1 to 8% by weight of a loading material
(for example, calcium carbonate) and an outer wrapper
paper sheet having a basis weight of 35 to 65 g/m2 and
containing 18 to 40% by weight of a loading material
(for example, calcium carbonate). Further, Jap. Pat.
Appln. KOKAI Publication No. 6-7141 discloses a
cigarette wrapped with an inner wrapper paper sheet
containing a magnesium-containing loading material and
an outer wrapper paper sheet containing an additive
package of alkali metal ions, alkaline-earth metal
ions, inorganic anions and organic anions.
Each of the conventional cigarettes has a slow
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burn rate and therefore a small amount of sidestream
smoke per unit time. However it has been found that
these cigarettes entail a problem of a large amount
of sidestream smoke per cigarette.
Accordingly, an object of the present invention is
to provide a cigarette which is small not only in an
amount of sidestream smoke per unit time, but also in
an amount of sidestream smoke per cigarette.
Disclosure of Invention
The above-described object of the present
invention has been achieved by studying the wrapper
paper itself that wraps cigarettes without providing
a filter or technically improving the tobacco filler
material (for example, cut tobacco).
Thus, according to the present invention, there
is provided a cigarette characterized by comprising a
tobacco section including a tobacco filler rod wrapped
with an inner wrapper paper sheet containing less than
4% by weight of calcium carbonate and an outer wrapper
paper containing calcium carbonate in an amount of
g/m2 to 50 g/m2 and a burn adjusting agent in an amount of 3% to
15% by weight.
Best Mode for Carrying Out the Invention
The present invention will now be described in
more detail.
The cigarette of the present invention comprises a
tobacco section including a tobacco filler rod wrapped
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with a predetermined inner wrapper paper sheet and a
predetermined outer wrapper paper sheet. An ordinary
filter may be attached to one end of the tobacco
section.
Of the wrapper paper sheets wrapping the tobacco
filler rod of the present invention, the inner wrapper
paper sheet has a calcium carbonate content of less
than 4% by weight, and thus does not substantially
contain calcium carbonate. When the inner wrapper
paper contains calcium carbonate in an amount of 4%
by weight or more, the burn rate of the resultant
cigarette becomes excessively high, and therefore the
amount of the sidestream smoke per unit time cannot
be significantly decreased. It is preferable that the
-15 --i~n-er---wr-apper.-_pape-r.__..doe-s----.not_._co.n.ta.in
cal.cium.__carbona.te.
The pulp that constitutes the inner wrapper paper
sheet may be any type pulp as long as it is a pulp that
is usually employed for a wrapper paper sheet of a
smoking article, such as flax pulp. It is preferable
that the amount of pulp is 10 to 18 g/m2. When the
amount of pulp is less than 10 g/m2, there is a
tendency that it becomes difficult to stably manu-
facture the wrapper paper. On the other hand, when the
amount of pulp exceeds 18 g/m2, there is a tendency
that the flavor of the cigarette becomes unfavorable.
As the air permeability of the inner wrapper paper
sheet becomes lower, the amount of sidestream smoke of
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the resultant cigarette per unit time is further
decreased. It is preferable that the air permeability
of the inner wrapper paper sheet is 1 to 30 CORESTA
units (CU), and more preferably, 6 CU to 30 CU.
The inner wrapper paper sheet may contain a burn
adjusting agent, but the amount thereof is preferably
up to 1% by weight (0 to 1% by weight). If the amount
of the burn adjusting agent exceeds 1% by weight, there
is a tendency that the resultant cigarette cannot
maintain a preferable burn rate of 6 mm/minute or
higher, which will be described later.
The burn adjusting agent added to the inner
wrapper paper sheet can be selected from alkali
metal salts of organic acids such as sodium citrate,
potassium citrate, sodium acetate, potassium acetate,
sodium tartrate, potassium tartrate, sodium malate,
potassium malate, sodium succinate, potassium succinate
and the like.
The outer wrapper paper sheet employed in the
present invention contains calcium carbonate in an
amount of 30 g/m2 or more and a burn adjusting agent
in an amount of 3% by weight or more. When the amount
of calcium carbonate is less than 30 g/m2 and/or the
amount of the burn adjusting agent is less than 3%
by weight, the effect of reducing the amount of the
sidestream smoke is not sufficiently exhibited. It is
preferable that calcium carbonate is contained in an
CA 02479162 2004-09-14
amount of 30 g/m2 or more and 50 g/m2 or less, and the
burn adjusting agent is contained in the wrapper paper
in an amount of 3 to 15% by weight.
As the burn adjusting agent used in the outer
5 wrapper paper sheet, alkali metal salts of succinic
acids are preferably used. Of these, potassium
succinate and sodium succinate are particularly
preferable. These materials can be used singly or
in combination.
The pulp that constitutes the outer wrapper paper
sheet may be of the same type as that used for the
inner wrapper paper sheet. It is preferable that the
amount of pulp is 20 to 50 g/m2.
Further, it is preferable that the outer wrapper
paper sheet has a basis weight of 50 g/m2 to 100 g/m2.
In the present invention, calcium carbonate is
added in the form of grains. The grain diameter can
be selected arbitrarily in consideration of cost and
easiness of making paper, but it should preferably be
0.02 ,u m to 10 gm.
The cigarette of the present invention, which
has the tobacco section doubly wrapped with the inner
wrapper paper sheet and the outer wrapper paper sheet,
is small in the sidestream smoke amount per unit time,
but also in the sidestream smoke amount per cigarette.
The outer wrapper paper sheet, which contains a
relatively large amount of calcium carbonate, has a
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high combustibility. When it is combined with the
inner wrapper paper sheet, which does not substantially
contain calcium carbonate, the burn rate becomes lower
than the case where the outer wrapper paper sheet
is employed solely, the amount of the sidestream
smoke per unit time is decreased, and the amount of
the sidestream smoke per cigarette is significantly
decreased, too. It is preferable that the burn rate
of the cigarette of the present invention is about
6 mm/minute or higher, and more preferably, 7 mm/minute
or higher. Such a burn rate can be achieved by setting
the content of the burn adjusting agent of the inner
wrapper paper sheet to 0 to 1% by weight as described
above. The burn rate of the cigarette of the present
invention is usually no more than about 12 mm/minute.
It should be noted that the burn rate of a cigarette
can be measured by an ordinary fishtail method.
The present invention will now be described by
way of Examples; however it is not limited to these
Examples.
Examples 1-4 and Comparative Examples 1-3
Cigarettes of the structure below were prepared.
<Specification of cigarettes>
Size: FSK*slim (circumference of 22.9 mm, length
of the tobacco section of 68 mm, length of the filter
of 30 mm and length of the tipping paper of 37 mm)
Cut tobacco: American blend, 0.565 g/cigarette
* trademark
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<Specification of outer wrapper paper>
Amount of pulp: 30 g/m2
Amount of calcium carbonate: 30 g/m2
Amount of citrate: 4.5% by weight
<Specification of Inner Wrapper paper>
As indicated in Table 1 below.
With regard to each of the cigarettes, the amount
of the sidestream smoke (total particulate matter)
was measured (for a burned length of 58 mm) together
with the burn rate by the fishtail method. Thus, the
amount of the sidestream smoke per unit time (mg/min)
and the amount of the sidestream smoke per cigarette
(mg/cigarette) were calculated. The results are shown
also in Table 1.
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CA 02479162 2004-09-14
As can be seen from the results shown in Table 1,
the cigarettes of the present invention each indicated
a significant decrease in amounts of sidestream smoke
both per unit time and per cigarette. In particular,
5 as compared to the cigarette wrapped with the outer
wrapper paper sheet only (Comparative Example 1), the
amount of the sidestream smoke per unit time and the
amount of the sidestream smoke per cigarette of the
cigarette of the present invention are remarkably
10 reduced. Further, it is understood from the comparison
between the cigarettes of the present invention and
those of Comparative Examples 3-1 to 3-4 that the
amount of the sidestream smoke per unit time and the
amount of the sidestream smoke per cigarette of the
cigarette of the present invention are remarkably
reduced when the amount of calcium carbonate contained
in the inner wrapper paper sheet is set to less than 4%
by weight. Furthermore, each of the cigarettes of
the present invention exhibited a burn rate of about
6 mm/min or more and showed a significant decrease in
both of the amount of the sidestream smoke per unit
time and the amount of the sidestream smoke per
cigarette.
Various embodiments of the present invention
have been described above; however the invention is
not limited to these embodiments. Needless to mention,
the above-described embodiments can be combined
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s ZZ
appropriately.
According to the present invention, there is
provided a cigarette small not only in the amount of
sidestream smoke per unit time but also in the amount
of sidestream smoke per cigarette.
