U.S. patent application number 16/631707 was filed with the patent office on 2020-05-28 for wrapping paper for a smoking article.
This patent application is currently assigned to JT International S.A.. The applicant listed for this patent is JT International S.A.. Invention is credited to Hiroyoshi Ono.
Application Number | 20200163373 16/631707 |
Document ID | / |
Family ID | 59702574 |
Filed Date | 2020-05-28 |
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United States Patent
Application |
20200163373 |
Kind Code |
A1 |
Ono; Hiroyoshi |
May 28, 2020 |
Wrapping Paper For A Smoking Article
Abstract
A wrapping paper for a smoking article includes a base paper,
wherein the base paper comprises a fibrous material, a filler
material, and one or more burning additives. A paper porosity of
the base paper is of 10 to 60 CU. A total amount of the one or more
burning additives is of 0.1 to 0.7 wt.-% based on the a dry weight
of the base paper.
Inventors: |
Ono; Hiroyoshi; (Tokyo,
JP) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
JT International S.A. |
Geneva |
|
CH |
|
|
Assignee: |
JT International S.A.
Geneva
CH
|
Family ID: |
59702574 |
Appl. No.: |
16/631707 |
Filed: |
August 14, 2018 |
PCT Filed: |
August 14, 2018 |
PCT NO: |
PCT/EP2018/072015 |
371 Date: |
January 16, 2020 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
D21H 27/00 20130101;
D21H 17/28 20130101; A24D 1/02 20130101; D21H 19/20 20130101; D21H
19/34 20130101; D21H 17/67 20130101; D21H 17/66 20130101; D21H
17/30 20130101; A24D 1/025 20130101; D21H 17/675 20130101; D21H
17/36 20130101 |
International
Class: |
A24D 1/02 20060101
A24D001/02; D21H 19/34 20060101 D21H019/34; D21H 17/66 20060101
D21H017/66; D21H 27/00 20060101 D21H027/00; D21H 17/28 20060101
D21H017/28; D21H 17/67 20060101 D21H017/67; D21H 17/30 20060101
D21H017/30 |
Foreign Application Data
Date |
Code |
Application Number |
Aug 24, 2017 |
EP |
17187689.9 |
Claims
1. A wrapping paper for a smoking article, comprising a base paper,
wherein the base paper comprises a fibrous material, a filler
material, and one or more burning additives, wherein: a. a paper
porosity of the base paper is 10 to 60 CU; and b. a total amount of
the one or more burning additives is 0.1 to 0.7 wt.-% based on a
dry weight of the base paper.
2. The wrapping paper according to claim 1, wherein the one or more
burning additives is selected from the group consisting of citrate
salts, acetate salts, phosphate salts, tartrate salts, nitrate
salts, or mixtures thereof.
3. The wrapping paper according to claim 1, wherein a basis weight
of the base paper is 20 to 26 g/m.sup.2.
4. The wrapping paper according to claim 1, wherein an amount of
the filler material is 17 to 28 wt.-% based on the dry weight of
the base paper.
5. The wrapping paper according to claim 1, wherein the filler
material is selected from the group consisting of calcium
carbonate, kaolin, clay, talc, titanium dioxide, alumina
trihydrate, precipitated silica and silicates (PSS), or mixtures
thereof.
6. The wrapping paper according to claim 1, wherein a diffusion
capacity of the base paper is 1.0 to 2.0 cm/s.
7. The wrapping paper according to claim 1, further comprising a
plurality of burn-suppressing regions that are provided apart from
each other.
8. The wrapping paper according to claim 7, wherein the plurality
of burn-suppressing regions are provided on a surface of the base
paper.
9. The wrapping paper according to claim 7, wherein the plurality
of burn-suppressing regions are provided embedded in a matrix of
the base paper.
10. The wrapping paper according to claim 7, wherein a diffusion
capacity of the plurality of burn-suppressing regions is 0.10 to
0.35 cm/s.
11. The wrapping paper according to claim 10, wherein a ratio of
the diffusion capacity of the plurality of burn-suppressing regions
to a diffusion capacity of the base paper is in the range of 5% to
35%.
12. The wrapping paper according to claim 7, wherein the plurality
of burn-suppressing regions contain at least one additive that
reduces a diffusion capacity of the base paper, and wherein the at
least one additives is selected from the group consisting of
alginates, polyvinyl alcohol, polyvinyl acetates, modified and
unmodified starches, cellulose derivatives, inorganic ions, natural
gums, or mixtures thereof.
13. The wrapping paper according to claim 7, wherein the plurality
of burn-suppressing regions are in a form of stripes.
14. The wrapping paper according to claim 1, wherein the fibrous
material is a cellulosic fibrous material.
15. A smoking article, comprising a charge of smokable material
surrounded by a wrapping paper according to claim 1.
Description
TECHNICAL FIELD
[0001] The present invention relates to a wrapping paper for a
smoking article and a smoking article comprising a wrapping
paper.
BACKGROUND ART
[0002] For most smokers, smoking of a single cigarette with around
7 to 12 puffs under standard smoking condition (ISO), depending on
the tobacco rod length and its diameter, provides a satisfactory
smoking experience. In order to reach the number of desired puffs,
several solutions are known from the state of the art.
[0003] U.S. Pat. No. 5,379,788 teaches a cigarette system which has
a greater number of puffs than a conventional cigarette of same
dimensions and length of tobacco rod, namely at least about 14
puffs. The cigarettes are intended to be partially smoked,
extinguished, stored and then resmoked. A filter is attached to the
tobacco rod of the cigarette constructed to provide a per-puff
delivery profile of tar, nicotine and flavor to the smoker which is
approximately the same for both smokings of the cigarette. The
greater-than-normal number of puffs is achieved by employing a
slower burning tobacco blend, greater tobacco density and/or burn
rate retardant paper.
[0004] US 2011/083,687 A1 discloses a burn rate of a smoking
article which is reduced by incorporating into the paper a filler
having a median particle size larger than about 2.5 microns and
thereby increasing the number of puffs.
[0005] Japanese Patent No. 2834325 discloses a cigarette in which a
cut tobacco density is set at 300 mg/cc or more in order to
decrease the combustion rate of the cut tobacco rod, thereby
increasing the number of puffs provided by the cigarette.
[0006] The problem of the present invention is to provide a
wrapping paper that can increase the puff count of a smoking
article without changing the tobacco rod length or diameter and
without impacting on the TNCO levels of the smoking article.
BRIEF DESCRIPTION OF THE INVENTION
[0007] The inventors have found that by providing a wrapping paper
with a certain porosity and a certain amount of a burning additive
it is possible to increase the puff count of the smoking
article.
[0008] A first aspect of the present invention relates to a
wrapping paper for a smoking article, comprising a base paper,
wherein the base paper comprises a fibrous material, a filler
material and one or more burning additives, wherein a paper
porosity of the base paper is of 10 to 60 CU, and a total amount of
burning additive is of 0.1 to 0.7 wt.-% based on the dry weight of
the base paper.
[0009] In another aspect of the present invention, a smoking
article comprising a charge of smokable material surrounded by a
wrapping paper according to the first aspect of the invention is
disclosed.
[0010] Further aspects and embodiments of the invention are
disclosed in the dependent claims and can be taken from the
following description and examples, without being limited
thereto.
FIGURES
[0011] The enclosed drawings should illustrate embodiments of the
present invention and convey a further understanding thereof. In
connection with the description it serves as explanation of
concepts and principles of the invention. Other embodiments and
many of the stated advantages can be derived in relation to the
drawings.
[0012] FIG. 1 shows an enlarged schematic perspective view showing
an example of a smoking article according to the present invention.
A smoking article 40 shown in FIG. 1 is provided with a smokable
rod 410 having a front end 410a and a base end 410b constituting an
ignition end and a filter 420 having a front end 420a and a base
end 420b. In the cigarette rod 410 and the filter 420, the base end
410b of the smokable rod and the front end 420a of the filter are
abutted against each other, whereby the smokable rod 410 and the
filter 420 are connected by a tipping paper 430. The smokable rod
410 is constituted of a rod 411 of tobacco filler and a wrapping
paper 412 wrapping an outer circumferential surface of the tobacco
filler rod 411. A wrapping paper 412 is constituted of a wrapping
paper according to the present invention.
[0013] FIG. 2 is a schematic perspective view, partly broken away,
showing an example of a cigarette that is wrapped with a cigarette
paper having stripe-shaped burn-suppressing regions according to
one embodiment of the present invention.
[0014] The cigarette 10 has a tobacco rod 11 consisting of a
tobacco filler 13 that is wrapped with a wrapping paper 12 of the
present invention in the form of a column. An ordinary filter 15
may be attached to the proximal end (namely, the downstream end in
the inhaling direction) 11b of the tobacco rod 11 by using a
tipping paper 14 according to a conventional method.
[0015] A plurality of stripe-shaped burn-suppressing regions 122,
which are coated as will be explained in the forthcoming
description, are formed on one of the surfaces of the base paper
121 that constitutes the wrapping paper 12 of the present
invention. These stripe-shaped burn-suppressing regions 122 are
formed apart from each other in the circumferential direction of
the tobacco rod 11.
[0016] Non-burn-suppressing regions 123 are formed between the
adjacent stripe-shaped burn-suppressing regions 122. Since the
regions 123 are constituted by a part of the base paper 121, they
can burn in an ordinary smoking state. Therefore, the regions 123
each act as a non-burn-suppressing region. For example, the
stripe-shaped burn-suppressing regions 122 each may have a width of
1 to 6 mm in the circumferential direction. The distance between
the adjacent burn-suppressing regions 122 may be 2 to 20 mm.
[0017] In the cigarette shown in FIG. 2, a non-burn-suppressing
region 124 may be provided to the region covering a distance d from
the tip 11a of the base paper 121.
[0018] FIG. 3 is a schematic perspective view, partly broken away,
showing an example of a cigarette that is wrapped with a cigarette
paper having annular band-shaped burn-suppressing regions according
to another embodiment of the present invention.
[0019] The cigarette 20 has a similar structure to that of the
cigarette 10 shown in FIG. 2, except for the structure of the
burn-suppressing regions in the wrapping paper. Therefore, in FIG.
3, an identical reference number is assigned to the same element as
the constitutional element in FIG. 2, and the explanation thereof
is omitted.
[0020] In the cigarette 20 shown in FIG. 3, a plurality of annular
band-shaped burn-suppressing regions 211 are formed on the base
paper 121 of the wrapping paper 21 wrapping the tobacco filler 13,
defining burn-suppressing regions. These annular band-shaped
burn-suppressing regions 211 are formed apart from each other in
the longitudinal direction of the tobacco rod 11.
[0021] Non-burn-suppressing regions 212 are formed between the
adjacent annular band-shaped burn-suppressing regions 211. Since
the non-burn-suppressing regions 212 are constituted by a part of
the base paper 121, they can burn in an ordinary smoking state.
Therefore, the regions 212 each act as non-burn-suppressing region,
as the regions 123 in FIG. 2 do. For example, the annular
band-shaped burn-suppressing regions 211 each may have a width of 4
to 7 mm in the longitudinal direction. The distance between the
adjacent burn-suppressing regions 24 may be 18 to 25 mm.
DETAILED DESCRIPTION OF THE INVENTION
[0022] Unless defined otherwise, technical and scientific terms
used herein have the same meaning as commonly understood by one of
ordinary skill in the art to which this invention belongs.
[0023] All values given in the present disclosure are to be
understood to be complemented by the word "about", unless it is
clear to the contrary from the context.
[0024] Smoking articles as referred to herein are not particularly
limited and can for example be cigarettes, cigarillos or the like.
They typically have a generally cylindrical rod shaped
configuration and include a charge, roll, or column of smokable
material, such as shredded tobacco (e.g. in cut filler form), which
is surrounded by a paper wrapper forming a so-called "tobacco rod".
A cigarette or cigarillo usually also has a cylindrical filter
element aligned in end-to-end relationship with the tobacco rod.
The filter element may, for example, comprise a plug of cellulose
acetate tow, and the tow is circumscribed by a wrapper material
known as "plug wrap". Typically, the filter element is attached to
one end of the tobacco rod using a circumscribing wrapping material
known as "tipping wrapper". The filter element wrapped by the
tipping wrapper is known as "mouthpiece element".
[0025] As used herein, wt.-% is to be understood as weight percent,
based on the dry weight of the base paper of the wrapping paper,
unless explicitly otherwise specified. In the present disclosure,
all amounts given in wt.-% in a particular embodiment add up to 100
wt.-%. The weight percent are thereby calculated by dividing the
mass of each component by the dry mass of the base paper.
[0026] TNCO levels as referred to herein stand for tar, nicotine
and carbon monoxide levels and can be measured by any suitable
method. In the present invention this is done according to ISO
3308:2012.
[0027] The symbol "CU" herein designates the CORESTA air
permeability unit that is commonly used in paper specifications by
smoking article designers. The CORESTA air permeability unit is
defined as: "the volumetric flow rate of air in cubic centimeters
per minute (cm.sup.3/min) passing through a 1 square centimeter
(cm.sup.2) sample of substrate at an applied pressure difference of
1 kilo-Pascal (kPa)." and are measured according to ISO
6565:2011.
[0028] The number of puffs of a smoking article may be measured by
any suitable method. In the present invention this is done
according to ISO 3308:2012.
[0029] The present invention relates to a wrapping paper for a
smoking article comprising a base paper, wherein the base paper
comprises a fibrous material, a filler material and one or more
burning additives, wherein a paper porosity of the base paper is of
10 to 60 CU, and a total amount of burning additive is of 0.1 to
0.7 wt.-% based on the dry weight of the base paper. By providing a
wrapping paper with such porosity and amount of burning additive it
is possible to increase the puff count of the smoking article.
[0030] In certain embodiments of the present wrapping paper, the
paper porosity of the base paper is 10 to 50 CU, e.g. 15 to 45 CU.
For example, in some embodiments the paper porosity of the base
paper is 10 to 20 CU, e.g. 13 to 17 CU, e.g. 15 CU. In other
embodiments, the paper porosity of the base paper is 25 to 35 CU,
e.g. 28 to 32 CU, e.g. 30 CU. In further embodiments, the paper
porosity of the base paper is 40 to 50 CU, e.g. 43 to 47 CU, e.g.
45 CU. This further increases the puff count of the smoking
article.
[0031] In certain embodiments of the present wrapping paper, the
burning additive is included in the base paper in an amount of 0.2
to 0.6 wt.-%, e.g. 0.3 to 0.5 wt.-% based on the dry weight of the
base paper. For example, in some embodiments the total amount of
burning additive is in an amount of 0.2 to 0.4 wt.-%, e.g. 0.3
wt.-%, based on the dry weight of the base paper. In other
embodiments, the total amount of burning additive is in an amount
of 0.3 to 0.5 wt.-%, e.g. 0.4 wt.-%, based on the dry weight of the
base paper. In further embodiments, the total amount of burning
additive is in an amount of 0.4 to 0.6 wt.-%, e.g. 0.5 wt.-%, based
on the dry weight of the base paper. This further increases the
puff count of the smoking article.
[0032] In certain embodiments of the present wrapping paper, the
burning additive is selected from the group consisting of citrate
salts, e.g. sodium and potassium citrate, acetate salts, e.g.
sodium and potassium acetate, phosphate salts, e.g. sodium and
potassium phosphate, tartrate salts, e.g. sodium and potassium
tartrate, nitrate salts, e.g. sodium and potassium nitrate, or
mixtures thereof.
[0033] The burning additive is not particularly limited, as long as
it is suitable for use in a smoking article. In certain embodiments
citrate salts are used.
[0034] In certain embodiments of the present wrapping paper, the
amount of filler in the base paper is 17 to 28 wt.-%, e.g. 20 to 25
wt.-%, based on the dry weight of the base paper. For example, the
amount of filler in the base paper is 19 to 25 wt.-%, e.g. 21 to 23
wt.-%, e.g. 22 wt.-%, based on the dry weight of the base paper. In
other embodiments, the amount of filler in the base paper is 22 to
28 wt.-%, e.g. 24 to 26 wt.-%, e.g. 25 wt.-%, based on the dry
weight of the base paper. In further embodiments, the amount of
filler in the base paper is 17 to 23 wt.-%, e.g. 19 to 21 wt.-%,
e.g. 20 wt.-%, based on the dry weight of the base paper. This
amount of filler provides an adequate resistance to manufacturing
forces to which the wrapping paper is subject to during high speed
manufacturing and also allows obtaining a desired opacity of the
wrapping paper.
[0035] In certain embodiments of the present smoking article
comprising a wrapping paper, the filler in the wrapping paper is
selected from the group of calcium carbonate, such as precipitated
calcium carbonate (PCC) or ground calcium carbonate (GCC), kaolin,
clay, talc, titanium dioxide, alumina trihydrate, precipitated
silica and silicates (PSS), and mixtures thereof.
[0036] Just like the burning additive, the filler is not
particularly limited, as long as it is suitable for use in a
smoking article. In certain embodiments calcium carbonate is
used.
[0037] In one embodiment, the paper porosity of the base paper is
10 to 20 CU, e.g. 13 to 17 CU, e.g. 15 CU, the total amount of
burning additive is in an amount of 0.2 to 0.4 wt.-%, e.g. 0.3
wt.-%, based on the dry weight of the base paper, and the amount of
filler in the base paper is 19 to 25 wt.-%, e.g. 21 to 23 wt.-%,
e.g. 22 wt.-%, based on the dry weight of the base paper.
[0038] In another embodiment, the paper porosity of the base paper
is 25 to 35 CU, e.g. 28 to 32 CU, e.g. 30 CU, the total amount of
burning additive is in an amount of 0.3 to 0.5 wt.-%, e.g. 0.4
wt.-%, based on the dry weight of the base paper, and the amount of
filler in the base paper is 22 to 28 wt.-%, e.g. 24 to 26 wt.-%,
e.g. 25 wt.-%, based on the dry weight of the base paper.
[0039] In a further embodiment, the paper porosity of the base
paper is 40 to 50 CU, e.g. 43 to 47 CU, e.g. 45 CU, the total
amount of burning additive is in an amount of 0.4 to 0.6 wt.-%,
e.g. 0.5 wt.-%, based on the dry weight of the base paper, and the
amount of filler in the base paper is 17 to 23 wt.-%, e.g. 19 to 21
wt.-%, e.g. 20 wt.-%, based on the dry weight of the base
paper.
[0040] According to certain embodiments, the balance to 100 wt.-%
of the dry weight of the base paper is essentially filler and
fibrous material.
[0041] In certain embodiments of the present wrapping paper, the
basis weight of the base paper is 20 to 26 g/m.sup.2, e.g. 21 to 24
g/m.sup.2, or e.g. 23 to 25 g/m.sup.2, e.g. 24 g/m.sup.2. By
providing a base paper with a basis weight comprised in these
ranges it is possible to obtain a desired opacity of the wrapping
paper while controlling the level of CO.
[0042] In certain embodiments of the present wrapping paper, the
diffusion capacity of the base paper is 1.0 to 2.0 cm/s, e.g. 1.0
to 1.8 cm/s, or e.g. 1.2 to 2.0 cm/s, or e.g. 1.2 to 1.8 cm/s, or
e.g. 1.2 to 1.6 cm/s, or e.g. 1.4 to 1.8 cm/s, or e.g. 1.4 to 1.6
cm/s. In the present invention the diffusion capacity of a wrapping
paper is measured according to CORESTA Recommended Method No. 77
(CRM No. 77 of April 2014).
[0043] In one embodiment of the invention, the wrapping paper may
be used in a "low ignition propensity" smoking article. A "low
ignition propensity" smoking article is one that has been designed
to be less likely than a conventional cigarette to ignite
furnishings and equipment, e.g. soft furnishings such as a couch or
mattress. Ideally, a low ignition propensity smoking article will
continue to burn when freely suspended such as in the holder of an
ashtray or when being held in the hand without puffing ("free
burn"). The tendency for a cigarette to go out during free burn is
referred to as "self-extinguishment".
[0044] The capability of a smoking article to extinguish or to
generate sufficient heat to continue burning, and thus potentially
cause ignition of bedding or upholstered furniture (referred to as
LIP) may be measured by any suitable method. In the present
invention this is done according to ISO 12863:2010.
[0045] The likelihood of a smoking article to extinguish while
burning in free air (referred to as FASE) may be measured by any
suitable method. In the present invention this is done according to
ISO 12863:2010.
[0046] In certain embodiments of the present wrapping paper, the
base paper may comprise a plurality of burn-suppressing regions
that are provided apart from each other. The burn-suppressing
regions may be provided on a surface of the base paper or embedded
within a matrix of the base paper. The plurality of
burn-suppressing regions may be provided on a same surface of the
base paper. Alternatively, one or more of the plurality of
burn-suppressing regions may be provided on a first surface of the
base paper and the remaining of the plurality of burn-suppressing
regions may be provided on a second, opposite surface of the base
paper.
[0047] Accordingly, the wrapping paper is formed of the base paper,
optionally with burn-suppressing regions provided therein. As the
regions of the wrapping paper which are outside the
burn-suppressing regions are to be considered as non-burn
suppressing regions the latter being the same as the base paper,
the present application uses the terms "non-burn suppressing
regions" and "base paper" interchangeably.
[0048] The shape and amount of these burn-suppressing regions is
not further limited and may vary according to the specific
requirements of the smoking article. In certain embodiments the
burn-suppressing regions are in a form of stripes. In one
embodiment all stripes are parallel to each other. In another
embodiment at least two stripes are non-parallel to each other.
[0049] These burn-suppressing regions may contain additives that
reduce the diffusion capacity of the base paper. The additives that
may be applied to the wrapper may be any of those used in the art
to reduce the ignition propensity of smoking articles.
[0050] In certain embodiments of the present wrapping paper, the
burn-suppressing regions contain at least one additive that reduces
the diffusion capacity of the base paper, where the additives are
selected from the group consisting of alginates, polyvinyl alcohol,
polyvinyl acetates, including partially hydrolysed derivatives and
copolymers, modified and unmodified starches, cellulose
derivatives, such as carboxy-methyl cellulose, ethyl-cellulose and
hydroxymethyl-cellulose, and combinations thereof. The one or more
additives may further comprise inorganic ions, such as phosphates,
mono- or divalent metal salts, silicas and other agents known in
the art to modify the burn rate, and combinations thereof. The
additives may yet further comprise natural gums, such as guar
gum.
[0051] The additives may be applied to the wrapping paper with a
liquid carrier, which may be in the form of a solution, suspension,
emulsion or a combination thereof. The liquid carrier may be
aqueous, non-aqueous or a combination thereof and may contain an
emulsifying agent depending on the nature of the additives.
[0052] In one embodiment, a suspension of additive may be applied
within an aqueous carrier. The aqueous carrier penetrates the base
paper transporting the additive into its matrix. Once the carrier
evaporates, the additive is left within the base paper matrix where
it can reduce the diffusion capacity either before or during the
burning of the smoking article. Once applied to the base paper, the
liquid carrier is allowed to evaporate allowing the wrapping paper
to dry and for the additive to set within the matrix of the base
paper.
[0053] In certain embodiments of the present wrapping paper, the
diffusion capacity of the burn-suppressing regions is 0.10 to 0.35
cm/s, e.g. 0.15 to 0.35 cm/s, or e.g. 0.10 to 0.30 cm/s, or e.g.
0.15 to 0.30 cm/s, or e.g. 0.15 to 0.25 cm/s, or e.g. 0.20 to 0.30
cm/s, or e.g. 0.20 cm/s to 0.25 cm/s.
[0054] In certain embodiments of the present wrapping paper, the
ratio of diffusion capacity between the burn-suppressing regions
and the non-burn-suppressing regions in the wrapping paper is in
the range of 5% to 35%, e.g. 10% to 35%, or e.g. 15% to 35%, or
e.g. 5% to 30%, or e.g. 10% to 30%, or e.g. 15% to 30%, or e.g. 10%
to 25%, or e.g. 15% to 25%. In other words, the ratio between the
diffusion capacity in the burn-suppressing regions to the diffusion
capacity of the base paper is comprised between 5% to 35%, e.g. 10%
to 35%, or e.g. 15% to 35%, or e.g. 5% to 30%, or e.g. 10% to 30%,
or e.g. 15% to 30%, or e.g. 10% to 25%, or e.g. 15% to 25%. By
providing such ratios of diffusion capacity between the
burn-suppressing regions and the non-burn suppressing regions
(i.e., the base paper) it is possible to provide a low ignition
propensity smoking article with a reduced impact on taste.
[0055] In certain embodiments of the present wrapping paper, the
fibrous material is a cellulosic fibrous material.
[0056] The present invention further relates to a smoking article
comprising a wrapping paper as in the embodiments described above
and in which the wrapping paper surrounds a charge, roll or column
of smokable material to form a tobacco rod.
[0057] In certain embodiments of the present smoking article, when
a tobacco rod is wrapped by the wrapping paper, the
burn-suppressing regions are in a form of stripes extending in a
longitudinal direction of the tobacco rod and being spaced apart
from each other in a circumferential direction of the tobacco
rod.
[0058] In certain embodiments of the present smoking article, when
a tobacco rod is wrapped by the wrapping paper, the
burn-suppressing regions are in a form of round annular bands
extending in a circumferential direction of the tobacco rod and
being spaced from each other in a longitudinal direction of the
tobacco rod.
[0059] Without being bound to a certain theory, the positive effect
of the present invention, i.e. the combination of an increased
number of puffs without changing the tobacco rod length or diameter
is due to the specific combination of a paper porosity of 10 to 60
CU and at least one burning additive in an amount of 0.1 to 0.7
wt.-% as laid out above.
[0060] The above embodiments can be combined arbitrarily, if
appropriate. Further possible embodiments and implementations of
the invention comprise also combinations of features not explicitly
mentioned in the foregoing or in the following with regard to the
examples of the invention. Particularly, a person skilled in the
art will also add individual aspects as improvements or additions
to the respective basic form of the invention.
EXAMPLES
[0061] The present invention will now be described in detail with
reference to examples thereof. However, these examples are
illustrative and do not limit the scope of the invention.
Example 1
[0062] Two 84 mm cigarettes with increased puff count were prepared
with the same tobacco blend. These cigarettes had both a 63 mm
tobacco rod attached to a 21 mm filter by a tipping paper. The
filters were cut from the same filter rod and the tipping papers
were cut from the same reel. The tobacco rod of cigarette A was
wrapped in a prior art wrapping paper (paper A), while cigarette B
was wrapped in a wrapping paper according to the invention (paper
B). In both wrapping papers the burn-suppressing regions were 6 mm
wide annular bands separated between them by 18 mm in a
construction similar to the one depicted in FIG. 3. The
specifications of the respective wrapping papers are indicated in
Table 1 below.
TABLE-US-00001 TABLE 1 Paper A Paper B Basis weight 27 g/m.sup.2 24
g/m.sup.2 Porosity 80 CU 45 CU Diffusion capacity in the 0.045 cm/s
0.230 cm/s burn-suppressing regions Diffusion capacity in the non-
2.3 cm/s 1.8 cm/s burn-suppressing regions (base paper diffusion
capacity) Burning additive type Citrate salt Citrate salt Burning
additive amount 1.4 wt.-% 0.5 wt.-% Filler (calcium carbonate) 27.7
wt.-% 20 wt.-%
[0063] These cigarettes were measured under ISO 3308:2012
conditions to determine their TNCO levels as well as their
respective puff counts. Self-extinguishment was also measured for
these cigarettes, both when positioned on a surface (ISO
12863:2010--referred to as LIP) and when burning in free air (ISO
12863:2010--referred to as FASE). The results are shown in Table 2
below. It was found that wrapping paper B increased the puff count
of cigarette B by 1.3 while maintaining very similar TNCO levels.
Paper B also shows a high self-extinguishing rate when positioned
on a surface and a significantly improved performance when burning
in free air.
TABLE-US-00002 TABLE 2 Cigarette A Cigarette B Tar 9.8 mg 10.0 mg
Nicotine 0.80 mg 0.85 mg CO 9.0 mg 9.3 mg Puff count 6.8 8.1 LIP
100% 94% FASE 30% 8%
Example 2
[0064] Two 84 mm low ignition propensity cigarettes were prepared
with the same tobacco blend. These cigarettes had both a 57 mm
tobacco rod attached to a 27 mm filter by a tipping paper. The
filters were cut from the same filter rod and the tipping papers
were cut from the same reel. The tobacco rod of cigarette C was
wrapped in the prior art wrapping paper from example 1 (paper A),
while cigarette D was wrapped in the wrapping paper according to
the invention from example 1 (paper B).
[0065] These cigarettes were measured under ISO 3308:2012
conditions to determine their TNCO levels as well as their
respective puff counts. Self-extinguishment was also measured for
these cigarettes, both when positioned on a surface (ISO
12863:2010--referred to as LIP) and when burning in free air (ISO
12863:2010--referred to as FASE). The results are shown in Table 3
below. It was found that wrapping paper B increased the puff count
of cigarette B by 0.9 while maintaining very similar TNCO levels.
Paper B continues to show a high self-extinguishing rate when
positioned on a surface and a significantly improved performance
when burning in free air.
TABLE-US-00003 TABLE 3 Cigarette C Cigarette D Tar 8.0 8.1 Nicotine
0.62 0.68 CO 9.1 9.2 Puff count 5.6 6.5 LIP 98% 95% FASE 38%
23%
Example 3
[0066] Three 84 mm cigarettes were prepared with the same tobacco
blend. These cigarettes had all a 57 mm tobacco rod attached to a
27 mm filter by a tipping paper. The filters were cut from the same
filter rod and the tipping papers were cut from the same reel. The
tobacco rod of cigarette E was wrapped in a prior art wrapping
paper (paper E), cigarette F was wrapped in a first wrapping paper
according to the invention (paper F), and cigarette G was wrapped
in a second wrapping paper according to the invention (paper G).
The specifications of the respective wrapping papers are indicated
in Table 4 below.
TABLE-US-00004 TABLE 4 Paper E Paper F Paper G Basis weight 26
g/m.sup.2 24 g/m.sup.2 24 g/m.sup.2 Porosity 45 CU 30 CU 15 CU
Burning additive type Citrate salt Citrate salt Citrate salt
Burning additive 1.0 wt.-% 0.4 wt.-% 0.3 wt.-% (citrate) Filler
(calcium 31.25 wt.-% 25 wt.-% 22 wt.-% carbonate)
[0067] These cigarettes were measured under ISO 3308:2012
conditions to determine their TNCO levels as well as their
respective puff counts. The results are shown in Table 5 below. It
was found that wrapping papers F and G increased the puff count of
cigarettes F and G by 1.0 and 1.2, respectively, while maintaining
very similar TNCO levels to those measured for cigarette E.
TABLE-US-00005 TABLE 5 Cigarette E Cigarette F Cigarette G Tar 6.0
6.0 6.3 Nicotine 0.6 0.5 0.5 CO 6.8 5.7 5.9 Puff count 6.1 7.1
7.3
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