EP2906056B1

EP2906056B1 - Low ignition propensity cigarette paper and cigarette including the same

Info

Publication number: EP2906056B1
Application number: EP12886172.1A
Authority: EP
Inventors: Young-Il JO; Jung-Yeon Park; Seong-Ho Ju; Jong-Oh Kim; Ik Won GWAK
Original assignee: KT&G Corp
Current assignee: KT&G Corp
Priority date: 2012-10-09
Filing date: 2012-12-05
Publication date: 2017-06-14
Anticipated expiration: 2032-12-05
Also published as: JP2015532367A; KR20140045632A; RU2596460C1; EP2906056A4; KR101480506B1; EP2906056A1; JP6091626B2; US20150257438A1; WO2014058102A1

Description

Technical Field

A low ignition propensity cigarette and a cigarette including the same are provided. Prior art low ignition propensity cigarettes are known from e.g. US 2011/0132382 or US 2011/0108042 .

Background Art

In general, in order to manufacture cigarettes, first, various kinds of leaf tobaccos are mixed and processed to get the desired flavor and taste. Next, the processed leaf tobaccos are cut to prepare cut tobacco leaves, and the cut tobacco leaves are wrapped with a cigarette paper to provide filter-less cigarette. Then, a filter is attached to the filter-less cigarette, if necessary.
A cigarette filter may include activated carbon, flavoring materials and the like, and may be composed of a mono-filter or a multi-filter, and the cigarette filter is surrounded by a cigarette filter wrapping paper. The cut tobacco leaves and the cigarette filter are connected with each other by a tipping paper, and the tipping paper may include fine holes.
A cigarette paper may be manufactured such that a target tar and a target nicotine may be carried out by appropriate porosity and combustibility during smoking, and may be manufactured such that smoke flavor which cigarettes intrinsically have may be imparted. The cigarette paper may be manufactured of flax, wood pulp and the like.
A material such as starch is coated on a low ignition propensity cigarette paper in the form of a band, and the porosity of the coated band is low. Accordingly, when the combustion of the cigarette reaches a band portion, the amount of oxygen inflow to the cut tobacco leaf is reduced, and thus, the cigarette may be extinguished so that a fire-safe function may be accomplished. However, when the amount of oxygen passing through the band during smoking increases, the taste of the cigarette may change.
The above information disclosed in this Background section is only for enhancement of understanding of the background of the invention and therefore it may contain information that does not form the prior art that is already known in this country to a person of ordinary skill in the art.

Disclosure of Invention

Technical Problem

An exemplary embodiment may accomplish a fire-safe function and maintain the taste of the cigarette.

Solution to Problem

An exemplary embodiment may be used to achieve other problems which have not been specifically mentioned in addition to the problem.
A low ignition propensity cigarette paper according to an exemplary embodiment includes a first coating layer disposed in a combustion section combusted by smoking, and a second coating layer disposed in a cigarette butt section where smoking is finished, wherein a basis weight of the first coating layer is smaller than a basis weight of the second coating layer.
In an exemplary embodiment, the basis weight of the first coating layer may be about 0.5 g/m² to about 2.5 g/m², and the basis weight of the second coating layer may be about 2.6 g/m² to about 5.5 g/m².
In an exemplary embodiment, a diffusion coefficient of the first coating layer may be greater than a diffusion coefficient of the second coating layer.
In an exemplary embodiment, the diffusion coefficient of the first coating layer may be about 1.001 cm/sec to about 2.500 cm/sec, and the diffusion coefficient of the second coating layer may be about 0.070 cm/sec to about 1.000 cm/sec.
In an exemplary embodiment, the combustion section may correspond to a distance a1 which the first coating layer is far from a first end portion of the low ignition propensity cigarette paper by about 5 mm to about 45 mm, and the cigarette butt section may correspond to a distance a4 which the second coating layer is far from a second end portion of the low ignition propensity cigarette paper by about 7 mm to about 31 mm.
In an exemplary embodiment, a distance a3 between the first coating layer and the second coating layer may be about 10 mm to about 52 mm.
A cigarette according to an exemplary embodiment includes a cigarette column portion, and a low ignition propensity cigarette paper surrounding the cigarette column portion, wherein the low ignition propensity cigarette paper includes a first coating layer disposed in a combustion section combusted by smoking and a second coating layer disposed in a cigarette butt section where smoking is finished, wherein a basis weight of the first coating layer is smaller than a basis weight of the second coating layer.
In an exemplary embodiment, the cigarette may further include a cigarette filter portion.
In an exemplary embodiment, the cigarette filter portion may include at least one filter member.
In an exemplary embodiment, the cigarette filter portion may include at least one of an adsorbent or a flavoring agent.

Advantageous Effects of Invention

Brief Description of Drawings

FIG. 1 is a perspective view schematically illustrating a cigarette according to an exemplary embodiment.
FIG. 2 is a cross-sectional view schematically illustrating a cigarette according to an exemplary embodiment.
FIG. 3 is a cross-sectional view schematically illustrating a cigarette according to an exemplary embodiment.
FIGS. 4 and 5 are graphs showing the sensory evaluation of the cigarette.

Mode for the Invention

The present invention will be described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments of the invention are shown. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. The drawings and description are to be regarded as illustrative in nature and not restrictive. Like reference numerals designate like elements throughout the specification
In addition, the detailed description of the widely known technologies will be omitted.
Hereinafter, a cigarette paper and a cigarette according to exemplary embodiments will be described in detail with reference to FIGS. 1 to 3.
FIG. 1 is a perspective view schematically illustrating a cigarette according to an exemplary embodiment, FIG. 2 is a cross-sectional view schematically illustrating a cigarette according to an exemplary embodiment, and FIG. 3 is a cross-sectional view schematically illustrating a cigarette according to an exemplary embodiment.
Referring to FIGS. 1 and 2, a cigarette 1 includes a cigarette column portion 10 combusted by fire and a cigarette filter portion 20 filtering cigarette smoke. The cigarette column portion 10 may be surrounded by a cigarette paper 19, and the cigarette filter portion 20 may be surrounded by a cigarette filter wrapping paper 28. The cigarette column portion 10 and the cigarette filter portion 20 may be connected with each other by a tipping paper 29 which may surround the cigarette column portion 10 and the cigarette filter portion 20. For example, an overlapping length of the cigarette paper 19 and the tipping paper 29 may be about 4 mm to about 6 mm. The circumference of the cigarette may be about 5 mm to about 30 mm. The cigarette filter portion 20 may be omitted.
The cigarette column portion 10 includes cut tobacco leaves 11 cut from leaf tobaccos processed by various methods.
The cigarette filter portion 20 may include a first filter portion 21. The first filter portion 21 may be formed of acetate tow, paper and the like. The cigarette filter portion 20 may be a multi-filter including two or more filter members. For example, referring to FIG. 3, the cigarette filter portion 20 includes a second filter portion 22 and a third filter portion 23. Besides, the cigarette filter portion 20 may include three filter members, four filter members, and multi-filter members.
The cigarette filter portion 20 may include an adsorbent, a flavoring agent and the like. For example, the adsorbent may be activated carbon and the like, and the flavoring agent may be an herb flavoring material and the like. In the multi-filter, one or more filter members may include at least one of the adsorbent or the flavoring agent. For example, referring to FIG. 3, at least one of the second filter portion 22 or the third filter portion 23 may include at least one of the adsorbent or the flavoring agent.
The cigarette paper 19 includes a base paper, and two coating layers 17 and 18 are disposed on the base paper, so that a fire-safe function may improve more than a cigarette paper with one coating layer. For example, the first coating layer 17 is disposed in a combustion section, combusted by smoking of customers, of the cigarette column portion 10, and the second coating layer 18 is disposed in a cigarette butt section, where smoking is finished, of the cigarette column portion 10. For example, generally, a length of the cigarette butt section excluding a cigarette filter may be about 10 mm to about 14 mm. In addition, the first coating layer 17 may be disposed in a distance a1 which is far from an end portion of the cigarette 1 by about 5 mm to about 45 mm. The second coating layer 18 may be disposed in a distance a2 which is far from an end portion of the tipping paper 29 by about 3 mm to about 25 mm. A distance a3 between the first coating layer 17 and the second coating layer 18 may be about 10 mm to about 52 mm. The second coating layer 18 may be disposed in a distance a4 which is far from an end portion of the cigarette paper 19 by about 7 mm to about 31 mm. Here, a1 may correspond to the combustion section, and a2 or a4 may correspond to the cigarette butt section. A width of the first coating layer 17 may be about 4 mm to about 6 mm, and a width of the second coating layer 18 may be about 5 mm to about 10 mm. The first and second coating layers 17 and 18 may basically reduce the porosity of the cigarette paper 19, such that oxygen inflow to the cigarette column portion 10 may decrease when the cigarette combustion reaches the first and second coating layers 17 and 18, thereby extinguishing the cigarette 1. The cigarette paper 19 including the first and second coating layers 17 and 18 refers to a low ignition propensity cigarette paper. The first and second coating layers 17 and 18 may be in the form of a band, and may have various shapes instead of the form of a band.
A coating composition is coated in the first and second coating layers 17 and 18. Here, the coating may include all kinds of methods that may form the coating composition on the cigarette paper 19, such as printing or spraying. The amount of the coating composition coated on the first coating layer 17 which is disposed adjacent to the combustion start position of the cigarette column portion 10 is smaller than the amount of the coating composition coated on the second coating layer 18 which is disposed adjacent to the cigarette filter portion 20. Accordingly, the amount of oxygen inflow passing through the first coating layer 17 may be greater than the amount of oxygen inflow passing through the second coating layer 18, and a diffusion coefficient of the first coating layer 17 may be greater than a diffusion coefficient of the second coating layer 18. The cigarette including the first coating layer 17 and the second coating layer 18 which have different physical properties from each other may not deteriorate the taste of the cigarette more than a cigarette including two coating layers which have the same physical properties as each other, for example the same amount of the coating composition. The first coating layer 17 which the amount of oxygen inflow to the first coating layer 17 is greater than the amount of oxygen inflow to a coating layer of the conventional cigarette may be formed, thereby minimizing the deterioration of the taste of the cigarette. In addition, the second coating layer 18 which the amount of oxygen inflow to the second coating layer 18 is similar to or smaller than the amount of oxygen inflow to a coating layer of the conventional cigarette may be formed, thereby maintaining a fire-safe function of the cigarette.
For example, a basis weight of the first coating layer 17 may be about 0.5 g/m² to about 2.5 g/m², and a basis weight of the second coating layer 18 may be about 2.6 g/m ² to about 5.5 g/m², and within this range, the fire-safe function of the cigarette may further improve and the deterioration of the cigarette taste may be further prevented. Here, a basis weight of the coating layer is a basis weight of the coating layer alone formed by coating the coating composition, excluding the base paper. In other words, the basis weight of the coating layer is a value which is a difference between a basis weight of the coating layer and the base paper and a basis weight of the base paper excluding the coating layer. In addition, a diffusion coefficient of the first coating layer 17 may be about 1.001 cm/sec to about 2.500 cm/sec, and a diffusion coefficient of the second coating 18 may be about 0.070 cm/sec to about 1.000 cm/sec, and within this range, the fire-safe function of the cigarette may further improve and the deterioration of the cigarette taste may be further prevented.
The porosity of the base paper of the cigarette 19 may be equal to or less than about 85 cu, the thickness of the base paper may be about 30 micrometers to about 60 micrometers, and the basis weight of the base paper may be about 15 g/m² to about 40 g/ m². A weight ratio of the coating composition to the entire weight of the cigarette paper 19 and the coating composition may be equal to or less than about 40 wt%. The coating composition may include various kinds of materials such as starch.
Hereinafter, the present invention will be described in more detail with reference to Examples, but the following Examples are just the examples of the present invention and the present invention is not limited thereto.

Example 1

A cigarette is manufactured the same as a cigarette of The One Blue, excluding that the first coating layer 17 and the second coating layer 18 are formed on the cigarette paper. A coating layer is not formed on a cigarette paper of the cigarette of The One Blue. The porosity of the cigarette paper is about 60 cu. The first coating layer 17 and the second coating layer 18 are disposed on the cigarette paper. A distance a1 which the first coating layer 17 is far from an end portion of the cigarette 1 is about 15 mm, and a distance a2 which the second coating layer 18 is far from an end portion of the tipping paper 29 is about 10 mm. A distance a3 between the first coating layer 17 and the second coating layer 18 is about 21 mm. Widths of the first coating layer 17 and the second coating layer 18 are about 5 mm and about 6 mm, respectively, and basis weights of the first coating layer 17 and the second coating layer 18 are about 0.8 g/m² and about 4.7 g/m², respectively. Diffusion coefficients of the first coating layer 17 and the second coating layer 18 are about 2.138 cm/sec and about 0.105 cm/sec. A base paper of the cigarette of The One Blue has about 26 g/m² of basis weight.

Comparative Example 1

A cigarette is manufactured the same as a cigarette of The One Blue which the porosity of the cigarette paper is about 60 cu.

Comparative Example 2

A cigarette is manufactured the same as a cigarette of The One Blue, excluding that a low ignition propensity cigarette paper with about 80 cu of the porosity is used. The first coating layer 17 and the second coating layer 18 are disposed on the cigarette paper. A distance a1 which the first coating layer 17 is far from an end portion of the cigarette 1 is about 10 mm, and a distance a2 which the second coating layer 18 is far from an end portion of the tipping paper 29 is about 10 mm. A distance a3 between the first coating layer 17 and the second coating layer 18 is about 20 mm. Widths of the first coating layer 17 and the second coating layer 18 are about 6 mm, and basis weights of the first coating layer 17 and the second coating layer 18 are about 3.1 g/m². Diffusion coefficients of the first coating layer 17 and the second coating layer 18 are about 0.105 cm/sec.

Cigarette smoke composition measurement

Smoke compositions of cigarettes manufactured in Example 1, Comparative Examples 1 and 2 are measured and shown in Table 1.

Table 1 [Table 1]

Tar(mg/cig.) Nicotine(mg/cig.) CO(mg/cig.)

Example 1 1.5 0.13 1.6

Comparative Example 1 1.4 0.13 1.5

Comparative Example 2 1.5 0.14 1.6
Referring to Table 1, the cigarette of Example 1 and the cigarettes of Comparative Examples 1 and 2 are similar to each other.

Cigarette combustion strength measurement

Cigarette combustion strength of cigarettes manufactured in Example 1, Comparative Examples 1 and 2 is measured and shown in Table 2. The combustion strength is based on ASTM E 2187-04. The combustion strength is measured repeatedly as 40 times, and ratios of cigarettes extinguished before about 8 mm from an end portion of the cigarette filter are measured. As the ratio (%) of the extinguished cigarettes is high, the combustion strength is large.

Table 2 [Table 2]

Nos. of cigarettes Full extinguishing Full combustion

Example 1 40 40 (100%) 0

Comparative Example 1 40 0 40 (100%)

Comparative Example 2 40 40 (100%) 0
Referring Table 2, the combustion strength of the cigarette in Example 1 is greater than the combustion strength of the cigarette in Comparative Example 1. In addition, the combustion strength of the cigarette in Example 1 is similar to the combustion strength of the cigarette in Comparative Example 2, although the amount of oxygen inflow of the first coating layer 17 in Example 1 increases.

Cigarette sensory evaluation

Tastes of cigarettes manufactured in Example 1 and Comparative Example 1 are evaluated by 20 panels and shown in FIG. 4, and tastes of cigarettes manufactured in Example 1 and Comparative Example 2 are evaluated by 20 panels and shown in FIG. 5.
Referring FIG. 4, a cigarette taste scarcely has a difference between the cigarette of Example 1 with a fire-safe function and the cigarette of Comparative Example 1 without a fire-safe function. The cigarette of Example 1 is similar to the cigarette of Comparative Example 1 in regards of abundant smoking amount, tobacco taste strength, irritation, off-flavor when smoking at a band, and a total tobacco taste.
Referring FIG. 5, compared the cigarette of Example 1 with a fire-safe function to the cigarette of Comparative Example 2 with a fire-safe function, a taste of the cigarette of Example 1 improves because the cigarette of Example 1 has less off-flavor when smoking at a band than the cigarette of Comparative Example 2.
While this invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Claims

A low ignition propensity cigarette paper comprising:
a first coating layer disposed in a combustion section combusted by smoking, and

a second coating layer disposed in a cigarette butt section where smoking is finished,

wherein a basis weight of the first coating layer is smaller than a basis weight of the second coating layer, and

wherein the combustion section corresponds to a distance a1 which the first coating layer is far from a first end portion of the low ignition propensity cigarette paper by about 5 mm to about 45 mm, and the cigarette butt section corresponds to a distance a4 which the second coating layer is far from a second end portion of the low ignition propensity cigarette paper by about 7 mm to about 31 mm.
The low ignition propensity cigarette paper of claim 1, wherein:
the basis weight of the first coating layer is about 0.5 g/m² to about 2.5 g/m², and the basis weight of the second coating layer is about 2.6 g/m² to about 5.5 g/m².
The low ignition propensity cigarette paper of claim 1, wherein:
a diffusion coefficient of the first coating layer is greater than a diffusion coefficient of the second coating layer.
The low ignition propensity cigarette paper of claim 3, wherein:
the diffusion coefficient of the first coating layer is about 1.001 cm/ sec to about 2.500 cm/sec, and the diffusion coefficient of the second coating layer is about 0.070 cm/sec to about 1.000 cm/ sec.
The low ignition propensity cigarette paper of claim 5, wherein:
a distance a3 between the first coating layer and the second coating layer is about 10 mm to about 52 mm.
A cigarette comprising:
a cigarette column portion, and

a low ignition propensity cigarette paper surrounding the cigarette column portion, wherein the low ignition propensity cigarette paper includes a first coating layer disposed in a combustion section combusted by smoking and a second coating layer disposed in a cigarette butt section where smoking is finished,

wherein a basis weight of the first coating layer is smaller than a basis weight of the second coating layer, and

wherein the combustion section corresponds to a distance a1 which the first coating layer is far from a first end portion of the low ignition propensity cigarette paper by about 5 mm to about 45 mm, and the cigarette butt section corresponds to a distance a4 which the second coating layer is far from a second end portion of the low ignition propensity cigarette paper by about 7 nun to about 31 mm.
A cigarette of claim 6, wherein:
the basis weight of the first coating layer is about 0.5 g/m² to about 2.5 g/m², and the basis weight of the second coating layer is about 2.6 g/m² to about 5.5 g/m².
A cigarette of claim 6, wherein:
a diffusion coefficient of the first coating layer is greater than a diffusion coefficient of the second coating layer.
A cigarette of claim 8, wherein:
the diffusion coefficient of the first coating layer is about 1.001 cm/ sec to about 2.500 cm/sec, and the diffusion coefficient of the second coating layer is about 0.070 cm/sec to about 1.000 cm/sec.
A cigarette of claim 6, wherein:
a distance a3 between the first coating layer and the second coating layer is about 10 mm to about 52 mm.
A cigarette of claim 6, further comprising:
a cigarette filter portion.
A cigarette of claim 11, wherein:
the cigarette filter portion includes at least one filter member.
A cigarette of claim 12, wherein:
the cigarette filter portion includes at least one of an adsorbent or a flavoring agent.