CN111031815B

CN111031815B - Wrapping paper for smoking articles

Info

Publication number: CN111031815B
Application number: CN201880054799.9A
Authority: CN
Inventors: 小野广善
Original assignee: JT International SA
Current assignee: JT International SA
Priority date: 2017-08-24
Filing date: 2018-08-14
Publication date: 2022-02-22
Anticipated expiration: 2038-08-14
Also published as: KR20200045493A; KR20240155338A; EP3654785A1; ES2919339T3; EP3654785B1; EA202090288A1; CN111065283A; EP3654784A1; EP3446573A1; EA038708B1; WO2019038133A1; JP2020531031A; EA202191093A1; EA202090289A1; US20200163373A1; WO2019038136A1; PL3446573T3; CN111065283B; CN111031815A; KR102715379B1

Abstract

The present invention relates to a smoking article comprising a wrapping paper, wherein the wrapping paper comprises a plurality of burn inhibiting regions provided separately from each other on one surface of the wrapping paper, wherein the ratio of diffusibility between the burn inhibiting regions and the base paper is in the range of 5% to 35%.

Description

Wrapping paper for smoking articles

Technical Field

The present invention relates to a wrapper for a smoking article having a low ignition propensity, and a smoking article comprising a wrapper having a low ignition propensity.

Background

When a burning smoking article falls onto home furnishings and equipment such as sofas or beds, the burning smoking article can cause a fire. To prevent this, several methods are known from the prior art to self-extinguish the smoking article. These types of smoking articles are commonly referred to as "low ignition propensity" smoking articles. However, self-extinguishment of the smoking article when it is used by a smoker is undesirable.

US 2013/104,915 teaches a cigarette paper which provides self-extinguishing properties to cigarettes made therefrom, wherein the base paper has a CO of less than 0.35cm/s₂Diffusivity and the cigarette paper comprises at least one discrete region wherein this region is perforated and has an air permeability greater than the air permeability outside the perforated region.

US 2016/198,761 relates to a cigarette paper with self-extinguishing properties, the cigarette paper having treated areas on which a composition comprising filler particles or a mixture of filler particles is applied, wherein the diffusion capacity in the treated areas of the cigarette paper is smaller than the diffusion capacity of the untreated areas. In this regard, at least 20% by weight of the filler particles in the treated region are formed by fillers that are in the form of platelets, fillers having a scalenohedral crystal structure, fillers having a rhombohedral crystal structure, or fillers having a cubic shape.

In order to prevent fire and suppress sidestream smoke, japanese patent No. 3049857 discloses a cigarette in which the length of the cigarette is half the length of a normal cigarette. And japanese patent application KOKAI No. 7-327654 discloses a cigarette in which the length of the cigarette rod is reduced to 1 to 1.5cm in order to prevent fire and suppress side stream smoke. These cigarettes, which are shorter than conventional cigarettes, provide a much smaller number of puffs than the cigarettes available on the market.

The problem of the present invention is to provide a wrapping paper for a smoking article which has a low ignition propensity and has a reduced impact on flavour.

Disclosure of Invention

The present inventors have found that by providing a wrapping paper for a smoking article having a plurality of burn inhibiting regions, and providing a certain ratio of diffusion capacity between the burn inhibiting regions and the base paper (i.e., non-burn inhibiting regions), a low ignition propensity smoking article having a reduced impact on flavor can be obtained.

A first aspect of the present invention relates to a wrapping paper comprising a base paper, wherein the base paper comprises a plurality of burn inhibiting regions provided so as to be separated from each other, wherein a ratio of diffusibility between the burn inhibiting regions and the base paper (i.e., non-burn inhibiting regions) is in a range of 5% to 35%.

In another aspect of the utility model, a smoking article is disclosed comprising a charge of smoke-producing material surrounded by wrapping paper according to the first aspect of the utility model. Smoking articles are particularly low ignition propensity smoking articles.

Further aspects and embodiments of the utility model are disclosed in the dependent claims and can be taken from the following description and examples without being limited thereto.

Drawings

The drawings should illustrate embodiments of the utility model and convey a further understanding of the utility model. The drawings are included to provide an explanation of the concepts and principles of the utility model. Other embodiments and many of the stated advantages can be derived with respect to the figures.

Figure 1 is a schematic perspective view, partially broken away, showing an example of a cigarette wrapped by cigarette paper having a stripe-shaped burn inhibiting area in accordance with one embodiment of the present invention.

The cigarette 10 has a rod 11 in the form of a cylinder made of tobacco filler 13 wrapped with a wrapping paper 12 according to the utility model. The conventional filter 15 may be attached to the proximal end (i.e., the downstream end in the direction of inhalation) 11b of the cigarette 11 according to a conventional method by using the tipping paper 14.

A plurality of stripe-shaped combustion suppressing areas 122, which are coated as will be explained in the following description, are formed on one surface of the base paper 121 constituting the wrapping paper 12 of the present invention. These strip-shaped combustion suppressing regions 122 are formed separately from each other in the circumferential direction of the tobacco rod 11.

The non-combustion suppressing region 123 is formed between the adjacent stripe-shaped combustion suppressing regions 122. Since the regions 123 are constituted by a part of the base paper 121, they can be burned in a normal smoking state. Therefore, the regions 123 each serve as a non-combustion-suppressing region. For example, the widths of the stripe-shaped combustion suppressing regions 122 in the circumferential direction may each be 1 to 6 mm. The distance between adjacent combustion suppression areas 122 may be 2 to 20 mm.

In the cigarette shown in fig. 1, a non-combustion-inhibiting region 124 may be provided for a region covering a distance d from the tip 11a of the base paper 121.

Figure 2 is a schematic perspective view, partially broken away, showing an example of a cigarette wrapped with cigarette paper having an annular band-shaped burn inhibiting area in accordance with another embodiment of the utility model.

Cigarette 20 has a structure similar to that of cigarette 10 shown in figure 1, except for the structure of the burn inhibiting area in the wrapping paper. Therefore, in fig. 2, the same elements as those of fig. 1 are assigned the same reference numerals, and an explanation thereof is omitted.

In the cigarette 20 shown in fig. 2, a plurality of annular band-shaped burn inhibiting regions 211 are formed on the base paper 121 of the wrapping paper 21 that wraps the tobacco filler 13, thereby defining burn inhibiting regions. These annular band-shaped combustion suppressing regions 211 are formed separately from each other in the longitudinal direction of the tobacco rod 11.

The non-combustion suppressing region 212 is formed between adjacent annular band-shaped combustion suppressing regions 211. Since the non-combustion-suppressing regions 212 are constituted by a part of the base paper 121, they can be combusted in a normal smoking state. Therefore, the regions 212 each serve as a non-combustion-suppressing region like the region 123 in fig. 1. For example, the widths of the annular band-shaped combustion suppressing regions 211 in the longitudinal direction may each be 4 to 7 mm. The distance between adjacent combustion suppression areas 211 may be 18 to 25 mm.

Detailed Description

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.

All values given in this disclosure are to be understood as being supplemented by the word "about" unless clearly contradicted by context.

The smoking articles referred to herein are not particularly limited and may be, for example, cigarettes, cigarillos, etc. They typically have a generally cylindrical rod-shaped configuration and comprise a charge, roll, or column of smoke-producing material, such as comminuted tobacco (e.g. in the form of shredded filler), surrounded by a paper wrapper forming a so-called "cigarette". Cigarettes or cigarillos also typically have cylindrical filter elements in end-to-end aligned relation with the tobacco rod. The filter element may, for example, comprise a plug of cellulose acetate tow and the tow circumscribes a wrapper material referred to as a "plug wrap". Typically, the filter element is attached to one end of the tobacco rod using an circumscribing wrapping material known as a "tipping wrapper". The filter element wrapped by the tipping wrapper is referred to as a "mouthpiece element".

As used herein, wt. -% is to be understood as a weight percentage based on the dry weight of the base paper, unless explicitly stated otherwise herein. In the present disclosure, in certain embodiments, all amounts given in wt. -% total up to 100wt. -%. Thus, the weight percentages are calculated by dividing the mass of each component by the dry mass of the base paper.

As used herein, a "low ignition propensity" smoking article is one that is designed to be less prone to ignite home furnishings and equipment (e.g., soft home furnishings such as sofas or mattresses) than traditional cigarettes. Ideally, a low ignition propensity smoking article will continue to burn when, for example, hanging freely in the holder of an ashtray or when held in the hand without smoking ("free burn"). The tendency of a cigarette to extinguish during free-burn is known as "self-extinguishment".

The ability of the smoking article to extinguish, or to generate sufficient heat to continue combustion and thus potentially cause ignition of, bedding or upholstered furniture (known as LIP) may be measured by any suitable method. In the present invention, this is done according to ISO 12863: 2010.

The likelihood of the smoking article extinguishing on combustion in free air (known as FASE) may be measured by any suitable method. In the present invention, this is done according to ISO 12863: 2010.

TNCO levels referred to herein represent tar, nicotine, and carbon monoxide levels and may be measured by any suitable method. In the present invention, this is done according to ISO 3308: 2012.

The symbol "CU" herein designates CORESTA air permeability units commonly used by smoking article designers in paper specifications. CORESTA air permeability units are defined as: "air volume flow rate in cubic centimeters per minute (cm3/min) through a 1 square centimeter (cm2) sample substrate under an applied pressure differential of 1 kilopascal (kPa)", and is measured according to ISO 6565: 2011.

The number of puffs of the smoking article may be measured by any suitable method. In the present invention, this is done according to ISO 3308: 2012.

The diffusion capacity of the wrapping paper was measured in the present invention according to CORESTA recommendation method No. 77(CRM No. 77) of month 4, 2014.

The present invention relates to a wrapping paper for a smoking article comprising a base paper, wherein the base paper comprises a plurality of burn inhibiting regions provided separately from each other, wherein a ratio of diffusibility between the burn inhibiting regions and the base paper is in the range of 5% to 35%. By providing this ratio of diffusion capacity between the burn inhibiting region and the base paper outside the burn inhibiting region (non-burn inhibiting region), a low ignition propensity smoking article having a reduced impact on flavour may be provided. The wrapping paper is formed of a base paper having a combustion-inhibiting region provided therein. Since the region of the wrapping paper outside the combustion-inhibiting region is considered to be a non-combustion-inhibiting region, which is the same as the base paper, the terms "non-combustion-inhibiting region" and "base paper" are used interchangeably herein.

In certain embodiments of the present wrapping paper, the ratio of diffusion capacity between the burn inhibiting region and the non-burn inhibiting region (i.e., the base paper) is in the range of 10% to 35%, or 15% to 35%, or 5% to 30%, or 10% to 30%, or 15% to 30%, or 10% to 25%, or 15% to 25%.

In a particularly preferred embodiment, the ratio of the diffusion capacity between the combustion-inhibiting region and the non-combustion-inhibiting region is in the range of 9% to 17%. It has been found that in this range the impact on flavour is particularly reduced, while good LIP and FASE performance is still present in the wrapping paper.

The burn inhibiting region may be provided on a surface of the base paper or embedded within a matrix of the base paper. The plurality of burn inhibiting regions may be provided on the same surface of the base paper. Alternatively, one or more of the plurality of burn inhibiting regions may be provided on a first surface of the base paper, and the remaining of the plurality of burn inhibiting regions may be provided on a second, opposite surface of the base paper.

The shape and amount of these burn suppression areas are not further limited and may vary according to the particular needs of the smoking article. In certain embodiments, the combustion-inhibiting region is in the form of a strip. In one embodiment, all of the strips are parallel to each other. In another embodiment, at least two strips are non-parallel to each other.

In certain embodiments of the present smoking article comprising wrapping paper, the burn inhibiting areas are in the form of strips extending in the longitudinal direction of the cigarette and spaced from each other in the circumferential direction of the cigarette when the cigarette is wrapped with the wrapping paper.

In certain embodiments of the present smoking article comprising wrapping paper, the burn inhibiting areas are in the form of circular bands extending in the circumferential direction of the cigarette and spaced from one another in the longitudinal direction of the cigarette when the cigarette is wrapped with the wrapping paper.

In certain embodiments of the present wrapping paper, the base paper (i.e., the non-burn inhibiting region) has a diffusion capacity of 1.0 to 2.0cm/s, such as 1.0 to 1.8cm/s, or such as 1.2 to 1.6cm/s, or such as 1.2 to 2.0cm/s, or such as 1.2 to 1.8cm/s, or such as 1.2 to 1.6cm/s, or such as 1.4 to 2.0cm/s, or such as 1.4 to 1.8cm/s, or such as 1.4 to 1.6 cm/s.

In certain embodiments of the wrapping paper, the diffusion capability of the burn inhibition zone is from 0.10 to 0.35cm/s, or such as from 0.15 to 0.35cm/s, or such as from 0.20 to 0.35cm/s, or such as from 0.10 to 0.30cm/s, or such as from 0.15 to 0.30cm/s, or such as from 0.20 to 0.30cm/s, or such as from 0.10 to 0.25cm/s, or such as from 0.15 to 0.25cm/s, or such as from 0.20 to 0.25 cm/s.

These burn inhibiting regions may contain additives that reduce the diffusion capability of the base paper. The additive which may be applied to the wrapper may be any additive used in the art to reduce the ignition propensity of a smoking article.

In certain embodiments of the present wrapping paper, the burn inhibiting zone in the wrapping paper comprises at least one additive that reduces the diffusion capability of the base paper. The additive is optionally selected from the group consisting of: alginates, polyvinyl alcohol, polyvinyl acetate (including partially hydrolyzed derivatives and copolymers), modified and unmodified starches, cellulose acetate derivatives (e.g., carboxymethyl cellulose, ethyl cellulose, hydroxymethyl cellulose), and combinations thereof. The additive may further include inorganic ions such as phosphate salts, monovalent or divalent metal salts, silica, or mixtures thereof. The additive may still further comprise a natural gum such as guar gum or the like.

The additive may be applied to the wrapping paper in a liquid carrier, which may be in the form of a solution, suspension, emulsion, or combination thereof. The liquid carrier can be aqueous, non-aqueous, or a combination thereof, and can include an emulsifier depending on the nature of the additive.

In one embodiment, a suspension of the additive may be applied within an aqueous carrier. The aqueous carrier penetrates the base paper, thereby transporting the additive into its matrix. Once the carrier evaporates, the additive remains within the base paper matrix, where it may reduce the ability to diffuse prior to or during combustion of the smoking article. Once applied to the base paper, the liquid carrier is allowed to evaporate, allowing the wrapping paper to dry and the additives to be placed within the matrix of the base paper.

In certain embodiments of the present wrapping paper, the base paper includes a fibrous material, a filler material, and one or more burn additives.

In certain embodiments of the present wrapping paper, the base paper has a paper porosity of 10 to 60CU, and the total amount of burn additive is 0.1 to 0.7wt. -%, based on the dry weight of the base paper. By providing a base paper having such porosity and an amount of burn additive, the puff count of the smoking article can be increased without affecting TNCO levels and without changing cigarette length or diameter.

In certain embodiments of the present wrapping paper, the base paper has a paper porosity of 10 to 50CU, for example 15 to 45 CU. This further increases the number of smoking openings of the smoking article.

In certain embodiments of the present wrapping paper, the amount of burn additive contained in the base paper is 0.2 to 0.6wt. -%, e.g. 0.3 to 0.5wt. -%, based on the dry weight of the base paper. This further increases the number of smoking openings of the smoking article.

In certain embodiments of the present wrapsheet, the burn 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.

The burn additive is not particularly limited so long as the burn additive is suitable for use in a smoking article. In certain embodiments, citrate is used.

In certain embodiments of the present wrapping paper, the amount of filler in the base paper is 17 to 28wt. -%, e.g. 20 to 25wt. -%, based on the dry weight of the base paper. This amount of filler provides sufficient resistance to manufacturing forces experienced by the wrapping paper during high speed manufacturing and also allows the desired opacity of the wrapping paper to be obtained.

In certain embodiments of the present smoking article comprising wrapper paper, the filler in the base paper is selected from the group consisting of: calcium carbonate (e.g., Precipitated Calcium Carbonate (PCC) or Ground Calcium Carbonate (GCC), kaolin, talc, titanium dioxide, alumina trihydrate, and Precipitated Silica and Silicate (PSS), or mixtures thereof.

Like the burn additive, the filler is not particularly limited so long as the filler is suitable for use in a smoking article. In certain embodiments, calcium carbonate is used.

In one embodiment, the paper porosity of the base paper is 40 to 50CU, such as 43 to 47CU, such as 45CU, the total amount of burn additive is in an amount of 0.4 to 0.6wt. -%, such as 0.5wt. -%, based on the dry weight of the base paper, and the amount of filler in the base paper is 17 to 23wt. -%, such as 19 to 21wt. -%, such as 20wt. -%, based on the dry weight of the base paper.

According to certain embodiments, the balance of 100wt. -% of the dry weight of the base paper is essentially filler and fibrous material.

In certain embodiments of the present wrapping paper, the base paper has a basis weight of 20 to 26g/m²E.g. 21 to 24g/m²Or for example 23 to 25g/m²E.g. 24g/m². By providing a base paper having a basis weight within these ranges, the desired opacity of the wrapping paper can be achieved while controlling the level of CO.

In certain embodiments of the present wrapping paper, the fibrous material is a cellulosic fibrous material.

The utility model further relates to a smoking article comprising a wrapper as in the previous embodiments and wherein the wrapper surrounds a charge, roll or column of smoke-producing material to form a cigarette.

In certain embodiments of the present smoking article, the burn inhibiting areas are in the form of strips extending in the longitudinal direction of the tobacco rod and spaced from each other in the circumferential direction of the tobacco rod when the tobacco rod is wrapped with the wrapping paper.

In certain embodiments of the present smoking article, the burn inhibiting areas are in the form of circular bands extending in the circumferential direction of the tobacco rod and spaced from one another in the longitudinal direction of the tobacco rod when the tobacco rod is wrapped with the wrapping paper.

The present invention relates to a wrapping paper including a plurality of combustion-inhibiting regions provided separately from each other on one surface of the wrapping paper, wherein a ratio of diffusibility between the combustion-inhibiting regions and a non-combustion-inhibiting region is in a range of 5% to 35%.

Without being bound by a particular theory, the positive impact of the present invention, i.e., the combination of low ignition propensity without destroying flavor properties, is due to the specific ratio of diffusive capacity between the burn inhibiting and non-burn inhibiting zones, as described above, disposed separately from one another at the base paper.

The above embodiments may be combined in any combination, if appropriate. Further possible embodiments and implementations of the utility model also include combinations of features not explicitly mentioned previously or later with respect to the examples of the utility model. In particular, the person skilled in the art will also add individual aspects as improvements or supplements to the corresponding basic forms of the utility model.

Examples of the utility model

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 utility model.

Example 1

Two 84mm cigarettes with increased puff count were prepared from the same tobacco cut. Both cigarettes had 63mm cigarettes attached to a 21mm filter by tipping paper. These filters are cut from the same filter rod and the tipping paper is cut from the same roll. The cigarettes of cigarette a are wrapped with prior art wrapping paper (paper a), while cigarette B is wrapped with wrapping paper according to the utility model (paper B). In both wrap papers, the burn inhibiting areas were 6mm wide annular bands spaced 18mm apart, similar in construction to that described in relation to FIG. 2. The specifications of the respective wrapping papers are indicated in table 1 below.

TABLE 1

The cigarettes were measured under ISO 3308:2012 conditions to determine their TNCO levels and their corresponding puff counts. The self-extinguishment of these cigarettes when positioned on a surface (ISO 12863: 2010-known as LIP) and when burned in free air (ISO 12863: 2010-known as FASE) was also measured. The results are shown in table 2 below. It was found that the 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 significantly improved performance when free air is burned.

Blind smoking tests by a panel of smoking experts were used to assess the impact on flavour. The test included providing each panelist with one cigarette of each type, the panelists smoked the cigarettes in succession, and then indicated which cigarette tasted better. The panel gave cigarette B a better flavour than cigarette a.

TABLE 2

	Cigarette A	Cigarette B
			Tar oil	9.8mg	10.0mg
Nicotine	0.80mg	0.85mg
			CO	9.0mg	9.3mg
Number of suction ports	6.8	8.1
			LIP	100％	94％
FASE	30％	8％

Example 2

Two 84mm low ignition propensity cigarettes were prepared from the same cut tobacco. Both cigarettes had 57mm cigarettes attached to a 27mm filter by tipping paper. These filters are cut from the same filter rod and the tipping paper is cut from the same roll. The cigarettes C were wrapped with the prior art wrapping paper (paper a) of example 1, while the cigarettes D were wrapped with the wrapping paper according to the utility model (paper B) of example 1.

The cigarettes were measured under ISO 3308:2012 conditions to determine their TNCO levels and their corresponding puff counts. The self-extinguishment of these cigarettes when positioned on a surface (ISO 12863: 2010-known as LIP) and when burned in free air (ISO 12863: 2010-known as FASE) was also measured. The results are shown in table 3 below. It was found that the wrapping paper B increased the puff count of cigarette D 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 significantly improved performance when free air is burned.

Blind smoking tests as performed by a panel of smoking experts as in example 1 showed that cigarette D had a better flavor than cigarette C.

TABLE 3

Example 3

Four 84mm cigarettes were prepared from the same tobacco cut. Both cigarettes had 63mm cigarettes attached to a 21mm filter by tipping paper. These filters are cut from the same filter rod and the tipping paper is cut from the same roll. The cigarette E was wrapped with wrapping paper (paper C) having no combustion-inhibiting region, which served as a flavor standard for the wrapping paper (paper D, E and F, respectively) for cigarettes of F, G and H that did contain combustion-inhibiting regions. The wrapping sheets D, E and F are different from the wrapping sheet C only in the presence of the combustion-suppressed region, and are different from each other in the diffusing ability of the combustion-suppressed region. In wrapping papers D, E and F, the burn inhibiting areas were 6mm wide annular bands spaced 18mm apart, similar in construction to that described in FIG. 2. The specifications of the respective wrapping papers are indicated in table 4 below.

The cigarettes were measured under ISO 3308:2012 conditions to determine their TNCO levels and their corresponding puff counts. The self-extinguishment of these cigarettes when positioned on a surface (ISO 12863: 2010-known as LIP) and when burned in free air (ISO 12863: 2010-known as FASE) was also measured. The results are shown in table 5 below. When compared to the wrapping papers D and E, it was found that the wrapping paper F continued to show a high self-extinguishing rate when positioned on a surface and significantly improved performance when free air burned, while maintaining a TNCO level very similar to the wrapping paper C.

TABLE 4

TABLE 5

	Cigarette E	Cigarette F	Cigarette G	Cigarette H
					Tar oil	8.4	9.1	9.2	8.9
Nicotine	0.7	0.7	0.8	0.7
					CO	8.3	10.3	10.1	9.5
LIP	20％	100％	100％	85％
					FASE	0％	90％	65％	10％

Blind smoking tests by a panel of experts were used to assess the impact on flavour. Each panelist received three reference cigarettes (cigarette E) and three test cigarettes (one cigarette of each type (F, G, H)), grouped in pairs such that each pair contains a reference cigarette and a test cigarette. The panelists smoked the cigarette pairs sequentially and then indicated which test cigarette was closer to the flavor of the reference cigarette. The smoking test results in cigarette H more closely resembling the flavour of reference cigarette E.

Example 4

Four 84mm cigarettes were prepared from the same tobacco cut. Both cigarettes had 63mm cigarettes attached to a 21mm filter by tipping paper. These filters are cut from the same filter rod and the tipping paper is cut from the same roll. The cigarettes of cigarette I were wrapped with wrapping paper (paper G) having no burn-inhibiting region, which served as a flavor standard for the wrapping paper (paper H, I and J, respectively) of the cigarettes that did contain the burn-inhibiting region cigarettes J, K and L. The wrapping sheets H, I and J are different from the wrapping sheet G only in the presence of the combustion-suppressed region, and are different from each other in the diffusing ability of the combustion-suppressed region. In wrapping papers H, I and J, the burn inhibiting areas were 6mm wide annular bands spaced 18mm apart, similar in construction to that described in FIG. 2. The specifications of the corresponding wrapping paper are indicated in table 6 below.

TABLE 6

The cigarettes were measured under ISO 3308:2012 conditions to determine their TNCO levels and their corresponding puff counts. The self-extinguishment of these cigarettes when positioned on a surface (ISO 12863: 2010-known as LIP) and when burned in free air (ISO 12863: 2010-known as FASE) was also measured. The results are shown in table 7 below. It was found that the wrapping paper J continued to show a high self-extinguishing rate when positioned on a surface and significantly improved performance when free air burned, while maintaining a TNCO level very similar to the wrapping paper G, when compared to the wrapping papers H and I.

TABLE 7

	Cigarette I	Cigarette J	Cigarette K	Cigarette L
					Tar oil	8.0	9.3	9.6	8.9
Nicotine	0.7	0.8	0.7	0.7
					CO	8.4	11.2	10.5	10.3
LIP	20％	100％	100％	95％
					FASE	5％	95％	75％	40％

Blind smoking tests as performed by a panel of experts as in example 3 showed that the flavour of cigarette L was closer to that of reference cigarette I.

Claims

1. A wrapping paper for a smoking article, the wrapping paper comprising a base paper, wherein the base paper comprises a plurality of burn inhibiting regions disposed separately from one another, wherein the ratio of diffusion capacity between the burn inhibiting regions and the base paper is in the range of 5% to 35%,

wherein the base paper comprises a fibrous material, a filler material, and one or more burn additives, the base paper having a sheet porosity of 10 to 60CU, and the total amount of burn additives is 0.1 to 0.7 wt% based on the dry weight of the base paper.

2. The wrapping paper according to claim 1, wherein the diffusion capacity of the burn inhibiting areas is 0.10 to 0.35 cm/s.

3. The wrapping paper as claimed in claim 1 or 2, wherein the base paper has a diffusing capacity of 1.0 to 2.0 cm/s.

4. Wrapping paper according to claim 1 or 2, wherein the burn inhibiting areas are provided on the surface of the base paper.

5. A wrapping paper according to claim 1 or 2, wherein the burn inhibiting areas are provided embedded in the base paper matrix.

6. The wrapping paper according to claim 1 or 2, wherein the burn inhibiting areas comprise at least one additive that reduces the diffusion capacity of the base paper, and wherein said additive is selected from the group consisting of: alginates, polyvinyl alcohol, polyvinyl acetate, modified and unmodified starches, cellulose acetate derivatives, inorganic ions, natural gums, or mixtures thereof.

7. A wrapping paper according to claim 1 or 2, wherein the burn inhibiting areas are in the form of strips.

8. The wrapping paper of claim 1, wherein the burn additive is selected from the group consisting of: citrate, acetate, phosphate, tartrate, nitrate or mixtures thereof.

9. Wrapping paper according to claim 1 or 2, wherein the base paper has a basis weight of 20 to 26g/m²。

10. Wrapping paper according to claim 1 or 2, wherein the amount of filler is 17 to 23 wt% based on the dry weight of the base paper.

11. A wrapping paper as claimed in claim 1 or 2 wherein the filler material is selected from the group consisting of: calcium carbonate, kaolin, talc, titanium dioxide, alumina trihydrate, and Precipitated Silica and Silicates (PSS), or mixtures thereof.

12. A wrapping paper as claimed in claim 1 or 2, wherein the fibrous material is a cellulosic fibrous material.

13. A smoking article comprising a charge of smoke-generable material wrapped with wrapping paper according to any one of the preceding claims 1 to 12.