KR102715379B1 - Packaging for smoking articles - Google Patents

Abstract

The present invention relates to a smoking article including a wrapping paper, wherein the wrapping paper includes a plurality of combustion-inhibiting regions provided spaced apart from each other on one surface of the wrapping paper, and a diffusion ratio between the combustion-inhibiting regions and the wrapping paper is in the range of 5% to 35%.

Description

Packaging for smoking articles

The present invention relates to a packaging material for a smoking article having low ignition properties and a smoking article comprising the packaging material having low ignition properties.

When a burning smoking article is left on furniture and equipment such as a sofa or bed, it can cause a fire. To prevent this, several approaches are known from the state of the art to make smoking articles self-extinguishing. These types of smoking articles are generally known as "low-flammability" smoking articles. However, it is not desirable for smoking articles to self-extinguish while the smoker is smoking.

US 2013/104,915 teaches a cigarette paper for making a cigarette having self-extinguishing properties, wherein the base paper has a _CO2 diffusion coefficient of less than 0.35 cm/s, the cigarette paper comprising at least one discrete region, the region being perforated and having an air permeability greater than the air permeability beyond the perforated region.

US 2016/198,761 relates to a cigarette paper having self-extinguishing properties having a treated area, wherein a composition comprising filler particles or a mixture of filler particles is applied onto the treated area, wherein the diffusion capacity of the treated area is lower than the diffusion capacity of an untreated area of the cigarette paper. In this regard, at least 20 wt.-% of the filler particles within the treated area are formed by fillers having a flake shape, fillers having a scalenohedral crystal structure, fillers having a rhombus cubic crystal structure, or fillers having a cubic shape.

In order to prevent fire and suppress side smoke, Japanese Utility Model No. 3049857 discloses a cigarette having a tobacco rod whose length is half that of a tobacco rod of a normal cigarette. In addition, Japanese Patent Application KOKAI No. 7-327654 discloses a cigarette having a tobacco rod whose length is reduced to 1 to 1.5 cm in order to prevent fire and suppress side smoke. These cigarettes having a tobacco rod shorter than a normal tobacco rod provide significantly fewer puffs than cigarettes available on the market.

An object of the present invention is to provide a packaging for a smoking article having low ignition properties and a reduced impact on flavor.

The present inventors have found that by providing a packaging material for a smoking article having a plurality of combustion-inhibiting regions and a predetermined diffusion capacity ratio between the combustion-inhibiting regions and the substrate, i.e., the combustion-non-inhibiting region, a low-ignition smoking article having a reduced impact on flavour can be obtained.

A first aspect of the present invention relates to a packaging material comprising a plurality of combustion-inhibiting regions provided spaced apart from each other, wherein the ratio of diffusion capacity between the combustion-inhibiting regions and the substrate, i.e., the combustion-non-inhibiting regions, is in the range of 5% to 35%.

In another aspect of the present invention, a smoking article is disclosed comprising a filler of a smokeable material surrounded by a wrapping according to the first aspect of the present invention. The smoking article is particularly a low-ignition smoking article.

Additional aspects and embodiments of the present invention are disclosed in the dependent claims and can be gleaned from the following description and examples, but are not limited thereto.

The accompanying drawings illustrate embodiments of the present invention and will convey a further understanding thereof. In conjunction with the detailed description, they serve to describe the concepts and principles of the present invention. Other embodiments and numerous stated advantages may be derived from the drawings.
FIG. 1 is a schematic partial cutaway perspective view illustrating an example of a cigarette wrapped with a cigarette paper having a band-shaped combustion-suppressing region according to one embodiment of the present invention.
The cigarette (10) has a tobacco rod (11) composed of tobacco filler (13) wrapped in a column-shaped wrapping paper (12) of the present invention. A conventional filter (15) can be attached to the proximal end (11b; i.e., the downstream end in the suction direction) of the tobacco rod (11) by using a tipping paper (14) according to a conventional method.
As described later in the following description, a plurality of band-shaped combustion-suppressing regions (122) are formed on one surface of the original paper (121) constituting the packaging paper (12) of the present invention. These band-shaped combustion-suppressing regions (122) are formed spaced apart from each other in the circumferential direction of the tobacco rod (11).
A combustion-non-suppression region (123) is formed between adjacent band-shaped combustion-suppression regions (122). Since these regions (123) are formed by a portion of the original paper (121), they can be combusted under a normal smoking state. Therefore, each region (123) functions as a combustion-non-suppression region. For example, each band-shaped combustion-suppression region (122) can have a width of 1 to 6 mm in the circumferential direction. The distance between adjacent combustion-suppression regions (122) can be 2 to 20 mm.
In the cigarette illustrated in FIG. 1, a combustion-non-suppression region (124) can be provided in an area covering a distance (d) from the tip (11a) of the filament (121).
FIG. 2 is a schematic partial cutaway perspective view illustrating an example of a cigarette wrapped with a cigarette paper having a combustion-inhibiting region in the shape of an annular band according to another embodiment of the present invention.
The cigarette (20) has a structure similar to that of the cigarette (10) illustrated in Fig. 1, except for the structure of the combustion-suppressing area of the packaging. Therefore, in Fig. 2, elements similar to those in Fig. 1 are given the same reference numerals, and their descriptions are omitted.
In the cigarette (20) illustrated in Fig. 2, a plurality of annular band-shaped combustion-suppression regions (211) are formed on the original paper (121) of the wrapping paper (21) that packages the tobacco filler (13) to define combustion-suppression regions. These annular band-shaped combustion-suppression regions (211) are formed spaced apart from each other in the longitudinal direction of the tobacco rod (11).
A combustion-non-suppression region (212) is formed between adjacent combustion-suppression regions (211) of annular band shapes. Since these combustion-non-suppression regions (212) are formed by a portion of the original paper (121), they can be combusted under a normal smoking state. Therefore, each region (212) functions as a combustion-non-suppression region like the region (123) of FIG. 1. For example, each combustion-suppression region (211) of annular band shape can have a width of 4 to 7 mm in the longitudinal direction. The distance between adjacent combustion-suppression regions (211) can be 18 to 25 mm.

Unless otherwise defined, 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.

Unless the context clearly indicates otherwise, all values given in this disclosure should be understood to be complemented by the word "about."

The smoking article referred to herein is not particularly limited and may be, for example, a cigarette, a cigar, or the like. The smoking article typically has a generally cylindrical rod-shaped configuration and comprises a filler, roll, or column of smokeable material, such as shredded tobacco (e.g., in the form of finely chopped filler), which is surrounded by a paper wrapper to form a so-called "tobacco rod." The cigarette or cigar typically also comprises a cylindrical filter element arranged end-to-end with the tobacco rod. The filter element may comprise, for example, a plug of cellulose acetate tow, the tow being wrapped around by a wrapping material known as a "plug wrap." Typically, the filter element is attached to one end of the tobacco rod using a wrapping material known as a "tipping wrapper." The filter element wrapped around the tipping wrapper is known as a "mouthpiece element."

As used herein, unless otherwise expressly stated, wt% is to be understood as a weight percentage based on the dry weight of the substrate. In this disclosure, all amounts given as wt% in certain embodiments ultimately add up to 100 wt%. Hereby, the weight percentage is calculated by dividing the mass of each component by the dry mass of the substrate.

As used herein, a "low-ignition" smoking article is a smoking article designed to be less likely than a conventional cigarette to ignite furniture and fixtures, such as soft furnishings such as a sofa or mattress. Ideally, a low-ignition smoking article will continue to burn when left free, such as in an ashtray holder, or when held in the hand without smoking ("free burning"). The tendency of a cigarette to go out during free burning is referred to as "self-extinguishing."

The ability of a smoking article to generate sufficient heat to extinguish or continue burning, thereby potentially causing ignition of upholstered furniture or bedding (referred to as LIP) can be measured by any suitable method. In the present invention, this is done in accordance with ISO 12863:2010.

The probability that a smoking article will be extinguished while burning in free air (referred to as FASE) can be measured by any suitable method. In the present invention, this is done according to ISO 12863:2010.

The 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 implemented according to ISO 3308:2012.

The designation "CU" herein refers to the CORESTA Air Permeability Unit, commonly used by smoking article designers in paper specifications. The CORESTA Air Permeability Unit is defined as "the volumetric flow rate of air (cm ³ /min) passing through a 1 cm ² substrate sample when subjected to a pressure differential of 1 kPa" and is measured in accordance with ISO 6565:2011.

The puff count of a smoking article can be measured by any suitable method. In the present invention, this is done in accordance with ISO 3308:2012.

The diffusion capacity of the packaging material is measured in the present invention according to CORESTA Recommended Method No. 77 (CRM No. 77) of April 2014.

The present invention relates to a wrapping paper for a smoking article, comprising a base paper having a plurality of combustion-inhibiting regions provided spaced apart from each other, wherein a diffusion ratio between the combustion-inhibiting regions and the base paper is in a range of 5% to 35%. By providing this diffusion ratio between the combustion-inhibiting regions and the base paper (combustion-non-inhibiting regions) outside the combustion-inhibiting regions, a low-ignition smoking article having a reduced effect on flavor can be provided. The wrapping paper is formed of the base paper provided with the combustion-inhibiting regions. Since the region of the wrapping paper outside the combustion-inhibiting regions is regarded as the combustion-non-inhibiting region, and the combustion-non-inhibiting region is identical to the base paper, the present application uses the terms "combustion-non-inhibiting region" and "base paper" interchangeably.

In certain embodiments of the present packaging material, the diffusion ratio between the combustion-inhibited region and the combustion-non-inhibited region, i.e., the original 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 particularly preferred embodiments, the diffusion ratio between the combustion-inhibited and combustion-uninhibited regions is in the range of 9% to 17%. It has been found that in this range the effect on flavour is particularly reduced, while the packaging still exhibits good LIP and FASE performance.

The combustion-inhibiting regions may be provided on a surface of the substrate or embedded within a matrix of the substrate. A plurality of combustion-inhibiting regions may be provided on the same surface of the substrate. Alternatively, at least one of the plurality of combustion-inhibiting regions may be provided on a first surface of the substrate and the remainder of the plurality of combustion-inhibiting regions may be provided on a second surface opposite the substrate.

The shape and amount of these combustion-inhibiting regions are not further limited and may vary depending on the specific requirements of the smoking article. In some embodiments, the combustion-inhibiting regions are in the form of strips. In one embodiment, all of the strips are parallel to one another. In another embodiment, at least two of the strips are not parallel to one another.

In certain embodiments of the present smoking article including the wrapper, when the tobacco rod is wrapped by the wrapper, the combustion-inhibiting region is in the form of a band extending in the longitudinal direction of the tobacco rod and spaced apart from each other in the circumferential direction of the tobacco rod.

In certain embodiments of the present smoking article including the wrapper, when the tobacco rod is wrapped by the wrapper, the combustion-inhibiting region is in the form of a round annular band extending in the circumferential direction of the tobacco rod and spaced apart from each other in the longitudinal direction of the tobacco rod.

In certain embodiments of the present packaging material, the diffusion capacity of the substrate, i.e. the combustion-uninhibited region, is from 1.0 to 2.0 cm/s, such as from 1.0 to 1.8 cm/s, or such as from 1.2 to 1.6 cm/s, or such as from 1.2 to 2.0 cm/s, or such as from 1.2 to 1.8 cm/s, or such as from 1.2 to 1.6 cm/s, or such as from 1.4 to 2.0 cm/s, or such as from 1.4 to 1.8 cm/s, or such as from 1.4 to 1.6 cm/s.

In certain embodiments of the present packaging material, the diffusion capacity of the combustion-inhibiting region is from 0.10 to 0.35 cm/s, or for example from 0.15 to 0.35 cm/s, or for example from 0.20 to 0.35 cm/s, or for example from 0.10 to 0.30 cm/s, or for example from 0.15 to 0.30 cm/s, or for example from 0.20 to 0.30 cm/s, or for example from 0.10 to 0.25 cm/s, or for example from 0.15 to 0.25 cm/s, or for example from 0.20 to 0.25 cm/s.

These combustion-inhibiting regions may include additives that reduce the spreading capacity of the substrate. The additives that may be applied to the packaging may be any of those additives used in the art to reduce the ignition potential of smoking articles.

In certain embodiments of the present packaging, the combustion-inhibiting region of the packaging comprises at least one additive that reduces the diffusion capacity of the substrate. 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 derivatives such as carboxy-methyl cellulose, ethyl-cellulose, hydroxymethyl-cellulose, and combinations thereof. The additive may further comprise an inorganic ion, such as a phosphate, a monovalent or divalent metal salt, silica, or mixtures thereof. The additive may further comprise a natural gum, such as guar gum.

The additive may be applied to the packaging together 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 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 substrate and delivers the additive within its matrix. When the carrier evaporates, the additive remains within the substrate matrix, where it may reduce the diffusion capacity prior to or during combustion of the smoking article. When applied to the substrate, the liquid carrier may evaporate, thereby drying the packaging and solidifying the additive within the matrix of the substrate.

In certain embodiments of the present packaging material, the base material comprises a fibrous material, a filler material, and one or more combustion additives.

In a given embodiment of the present packaging material, the paper porosity of the base paper is from 10 to 60 CU, and the total amount of the combustion additive is from 0.1 to 0.7 wt% based on the dry weight of the base paper. By providing a base paper having such porosity and such amount of combustion additive, the number of puffs of the smoking article can be increased without affecting the TNCO level or changing the tobacco rod length or diameter.

In certain embodiments of the present packaging, the paper porosity of the base paper is from 10 to 50 CU, for example from 15 to 45 CU. This further increases the number of puffs of the smoking article.

In certain embodiments of the present packaging, the combustion additive is included in the base paper in an amount of from 0.2 to 0.6 wt%, for example from 0.3 to 0.5 wt%, based on the dry weight of the base paper. This further increases the puff count of the smoking article.

In certain embodiments of the present packaging material, the combustion additive is selected from the group consisting of citrates, such as sodium and potassium citrate, acetates, such as sodium and potassium acetate, phosphates, such as sodium and potassium phosphate, tartarates, such as sodium and potassium tartrate, nitrates, such as sodium and potassium nitrate, or mixtures thereof.

The combustion additive is not particularly limited as long as it is suitable for use in smoking articles. In certain embodiments, citrate is used.

In a given embodiment of the present packaging material, the amount of filler in the base paper is 17 to 28 wt%, for example 20 to 25 wt%, based on the dry weight of the base paper. This amount of filler provides adequate resistance to the manufacturing forces applied to the packaging material during high-speed manufacturing, and also enables the desired opacity of the packaging material to be achieved.

In certain embodiments of the present smoking article comprising a wrapper, the filler within the paper is selected from the group consisting of calcium carbonate, such as precipitated calcium carbonate (PCC) or ground calcium carbonate (GCC), kaolin, talc, titanium dioxide, alumina trihydrate, and precipitated silica and silicates (PSS), or mixtures thereof.

As with combustion additives, fillers are not particularly limited as long as they are suitable for use in smoking articles. In certain embodiments, calcium carbonate is used.

In one embodiment, the paper porosity of the base paper is 40 to 50 CU, such as 43 to 47 CU, such as 45 CU, the total amount of combustion additive is 0.4 to 0.6 wt%, such as 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%, such as 19 to 21 wt%, such as 20 wt%, based on the dry weight of the base paper.

According to a given embodiment, the remainder relative to 100 wt% of the dry weight of the paper is essentially filler and fibrous material.

In certain embodiments of the present packaging material, the basis weight of the paper stock is from 20 to 26 g/m ² , such as from 21 to 24 g/m ² , or from 23 to 25 g/m ² , such as from 24 g/m ² . By providing paper stock having a basis weight within this range, the desired opacity of the packaging material can be obtained while controlling the CO level.

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

The present invention also relates to a smoking article comprising a wrapper as in the embodiments described above, wherein the wrapper surrounds a filler, roll, or column of smokeable material to form a tobacco rod.

In certain embodiments of the present smoking article, when the tobacco rod is wrapped by the wrapper, the combustion-inhibiting region is in the form of a band extending in the longitudinal direction of the tobacco rod and spaced apart from each other in the circumferential direction of the tobacco rod.

In certain embodiments of the present smoking article, when the tobacco rod is wrapped by the wrapper, the combustion-inhibiting region is in the form of a round annular band extending in the circumferential direction of the tobacco rod and spaced apart from each other in the longitudinal direction of the tobacco rod.

The present invention relates to a packaging paper, comprising a plurality of combustion-inhibiting regions provided spaced apart from each other on one surface of the packaging paper, wherein a diffusion ratio between the combustion-inhibiting regions and the combustion-non-inhibiting regions is in a range of 5% to 35%.

Without wishing to be bound by any theory, it is believed that the positive effects of the present invention, namely the combination of low ignition properties without deterioration of flavor characteristics, result from the specific diffusion ratio between the combustion-inhibited and combustion-non-inhibited regions provided in the substrate, which are spaced apart from each other as described above.

The above embodiments may be combined arbitrarily, if appropriate. Additional possible embodiments and examples of the invention also include combinations of features that are not explicitly mentioned in the foregoing or following descriptions of the embodiments of the invention. In particular, the person skilled in the art will also add individual aspects as improvements or additions to each basic form of the invention.

yes

The present invention will now be described in detail with reference to examples thereof. However, these examples are intended to be illustrative and do not limit the scope of the present invention.

Example 1

Two 84 mm cigarettes having an increased puff count were manufactured from the same tobacco blend. Both cigarettes had a 63 mm tobacco rod attached to a 21 mm filter by tipping paper. The filters were cut from the same filter rod and the tipping paper was cut from the same reel. The tobacco rod of cigarette A was wrapped in a prior art wrapper (wrapper A), while the tobacco rod of cigarette B was wrapped in a wrapper according to the present invention (wrapper B). In both wrappers, the burn-inhibiting zones were 6 mm wide annular bands spaced 18 mm apart in a configuration similar to that illustrated in FIG. 2 . The specifications of each wrapper are shown in Table 1 below.

[Table 1]

These cigarettes were measured under ISO 3308:2012 conditions to determine their TNCO levels as well as their respective puff numbers. The self-extinguishing of these cigarettes was also measured when placed on a surface (referred to as ISO 12863:2010 - LIP) and when burned in free air (referred to as ISO 12863:2010 - FASE). The results are shown in Table 2 below. It was found that wrapper B increased the puff number of cigarette B by 1.3 while maintaining very similar TNCO levels. Wrapper B also exhibits a high self-extinguishing rate when placed on a surface and a significantly improved performance when burned in free air.

The effect on flavor was assessed using a blind smoking test conducted with a panel of smoking experts. The blind test consisted of providing each panelist with one cigarette of each type, smoking them consecutively and indicating which cigarette had the better flavor. The expert panel concluded that cigarette B had a better flavor than cigarette A.

[Table 2]

Example 2

Two 84 mm low-flammability cigarettes were manufactured from the same tobacco blend. Both cigarettes had 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 paper was cut from the same reel. The tobacco rod of cigarette C was wrapped in a prior art wrapper (wrapper A) of Example 1, while the tobacco rod of cigarette D was wrapped in a wrapper according to the present invention (wrapper B) of Example 1.

These cigarettes were measured under ISO 3308:2012 conditions to determine their TNCO levels as well as their respective puff numbers. The self-extinguishing of these cigarettes was also measured when placed on a surface (referred to as ISO 12863:2010 - LIP) and when burned in free air (referred to as ISO 12863:2010 - FASE). The results are shown in Table 3 below. It was found that wrapper B increased the puff number of cigarette D by 0.9 while maintaining very similar TNCO levels. Wrapper B continues to show high self-extinguishing rates when placed on a surface and shows significantly improved performance when burned in free air.

As in Example 1, a blind smoking test conducted with a panel of smoking experts showed that cigarette D had a better flavour than cigarette C.

[Table 3]

Example 3

Four 84 mm cigarettes were prepared from the same tobacco blend. All of the cigarettes had a 63 mm tobacco rod attached to a 21 mm filter by tipping paper. The filters were cut from the same filter rod, and the tipping paper was cut from the same reel. The tobacco rod of cigarette E was wrapped in a wrapper without a burn-inhibited zone (wrapper C), which was used as a flavor indicator for the wrappers of the tobacco rods of cigarettes F, G, and H which included a burn-inhibited zone (wrappers D, E, and F, respectively). Wrappers D, E, and F differ from wrapper C only in the presence or absence of a burn-inhibited zone, and differ from each other in the diffusion capacity of the burn-inhibited zone. In wrappers D, E, and F, the burn-inhibited zone was a 6 mm wide annular band spaced 18 mm apart in a configuration similar to that illustrated in FIG. The specifications of each wrapper are shown in Table 4 below.

These cigarettes were measured under ISO 3308:2012 conditions to determine their TNCO levels as well as their respective puff numbers. The self-extinguishing of these cigarettes was also measured when placed on a surface (referred to as ISO 12863:2010 - LIP) and when burned in free air (referred to as ISO 12863:2010 - FASE). The results are shown in Table 5 below. It was found that wrapper F consistently showed higher self-extinguishing rates when placed on a surface and significantly improved performance when burned in free air compared to wrappers D and E, while maintaining TNCO levels very similar to wrapper C.

[Table 4]

[Table 5]

The effect on flavour was assessed using a blind smoking test conducted with an expert panel. Each panelist was provided with three reference cigarettes (cigarette E) and three test cigarettes (cigarettes F, G and H of each type) paired so that each pair included a reference and a test cigarette. The panelist smoked the cigarette pairs consecutively and then indicated which test cigarette had a flavour closer to the reference cigarette. The blind smoking concluded that cigarette H had a flavour closer to the reference cigarette E.

Example 4

Four 84 mm cigarettes were prepared from the same tobacco blend. All of the cigarettes had a 63 mm tobacco rod attached to a 21 mm filter by tipping paper. The filters were cut from the same filter rod, and the tipping paper was cut from the same reel. The tobacco rod of cigarette I was wrapped in a wrapper without a burn-inhibited zone (wrapper G), which was used as a flavor indicator for the wrappers of the tobacco rods of cigarettes J, K, and L including burn-inhibited zones (wrappers H, I, and J, respectively). Wrappers H, I, and J differ from wrapper G only in the presence or absence of a burn-inhibited zone, and differ from each other in the diffusion capacity of the burn-inhibited zones. In wrappers H, I, and J, the burn-inhibited zones were 6 mm wide annular bands spaced 18 mm apart in a configuration similar to that illustrated in FIG. 2 . The specifications of each wrapper are shown in Table 6 below.

[Table 6]

These cigarettes were measured under ISO 3308:2012 conditions to determine their TNCO levels as well as their respective puff numbers. The self-extinguishing of these cigarettes was also measured when placed on a surface (referred to as ISO 12863:2010 - LIP) and when burned in free air (referred to as ISO 12863:2010 - FASE). The results are shown in Table 7 below. It was found that wrapper J consistently showed higher self-extinguishing rates when placed on a surface compared to wrappers H and I, and significantly improved performance when burned in free air, while maintaining TNCO levels very similar to wrapper G.

[Table 7]

As in Example 3, a blind smoking test conducted with an expert panel showed that cigarette L had a flavour closer to the reference cigarette I.

Claims (15)

In packaging for smoking articles, including raw paper,
The above-mentioned material comprises a fibrous material, a filler material, one or more combustion additives, and a plurality of combustion-inhibiting regions provided spaced apart from each other,
The diffusion ratio between the above combustion-suppression region and the above-mentioned original site is in the range of 5% to 35%,
A packaging paper, wherein the paper porosity of the base paper is 40 to 50 CU, the total amount of the combustion additive is 0.4 to 0.6 wt% based on the dry weight of the base paper, and the amount of the filler in the base paper is 17 to 23 wt% based on the dry weight of the base paper. In the first paragraph,
A packaging material having a diffusion capacity of the above combustion-inhibition region of 0.10 to 0.35 cm/s. In paragraph 1 or 2,
A packaging paper having a diffusion capacity of the above-mentioned raw material of 1.0 to 2.0 cm/s. In paragraph 1 or 2,
The above combustion-suppressing region is provided on the surface of the original paper, the packaging paper. In paragraph 1 or 2,
The above combustion-inhibiting region is provided embedded within the raw material matrix, the packaging material. In paragraph 1 or 2,
A packaging paper, wherein the combustion-inhibiting region comprises at least one additive that reduces the diffusion capacity of the substrate, wherein the additive is selected from the group consisting of alginates, polyvinyl alcohol, polyvinyl acetate, modified and unmodified starches, cellulose derivatives, inorganic ions, natural gums, or mixtures thereof. In paragraph 1 or 2,
The above combustion-suppression region is a packaging material in the form of a belt. delete In paragraph 1 or 2,
A packaging paper, wherein the paper porosity of the base paper is 45 CU, the total amount of the combustion additive is 0.5 wt% based on the dry weight of the base paper, and the amount of the filler in the base paper is 20 wt% based on the dry weight of the base paper. In paragraph 1 or 2,
The above combustion additive is selected from the group consisting of citrate, acetate, phosphate, tartrate, nitrate, or mixtures thereof. In paragraph 1 or 2,
Packaging paper having a basis weight of 20 to 26 g/ ^m2 . delete In paragraph 1 or 2,
A packaging material wherein the above filler material is selected from the group consisting of calcium carbonate, kaolin, talc, titanium dioxide, alumina trihydrate, and precipitated silica and silicate (PSS), or mixtures thereof. In paragraph 1 or 2,
The above fibrous material is a cellulose fibrous material, packaging paper. A smoking article comprising a filling of a smokeable substance surrounded by a wrapping according to claim 1 or 2.