Deeply embossed, highly permeable cigarette paper

Abstract

The present invention is a method for cutting 1 cm of base paper with an applied pressure difference of 1 kPa. 2 The sample passes through 40 to 80 cm 3 The present invention relates to a smoking article wrapper (1) comprising a non-perforated breathable base paper having a naturally high air porosity of 1 / min, the smoking article wrapper (1) having at least one embossed surface area (11) and at least one non-embossed surface area (12). The present invention relates to a smoking article wrapper (1) having a breathability of 1 cm of the smoking article wrapper (1) when an applied pressure difference of 1 kPa is applied. 2 Passing through the sample of ≧40cm 3 / min, and characterized in that the embossed area (11) comprises an embossment having a depth of ≥ 16 μm. The present invention further relates to a smoking article comprising the smoking article wrapper (1), and respective methods for producing such a smoking article wrapper (1) and a smoking article.

Description

[Technical field]

[0001] The present invention relates to a smoking article wrapper and a method for manufacturing such a smoking article wrapper according to the preamble of claims 1 and 13. Furthermore, the present invention relates to a smoking article comprising a smoking article wrapper according to the preamble of claim 1. [Background technology]

[0002] Smoking articles, such as cigarettes, are consumer goods that are manufactured in large quantities. They usually comprise a tobacco rod formed by encapsulating tobacco cut filler with a paper-based wrapper in a longitudinally extending, generally cylindrical rod. Besides their main tobacco encapsulating function, paper-based smoking article wrappers often also form a communication aid for the manufacturer and have various printed designs, colors, and / or markings (watermarks, embossing, etc.), which may form part of a branding function, among others, allowing consumers to recognize the product. Thus, it is highly appreciated to provide visual effects on cigarette paper to allow for the distinction of cigarettes from other brands or to provide a premium appearance of cigarettes and / or cigarette paper. Embossing in particular is required to allow for the application of visual effects as well as tactile effects. Furthermore, deep embossing is associated by consumers with a valuable product.

[0003] In the following, the terms "smoking article" and "cigarette" are used interchangeably. Some embodiments of the present invention are described only with respect to cigarettes or cigarette paper. However, these embodiments are also applicable to any other smoking article and / or smoking article wrapper and should be considered as disclosed.

[0004] From the document CN 101 581 062A, an embossed cigarette packing material and a method for producing such a material are known. The embossing depth is in the range of 5-50 μm. Furthermore, it is disclosed that the breathability of the cigarette packing material can be controlled by electrostatic perforation or laser drilling.

[0005] Due to the local compression of the base paper during the embossing procedure, the paper fibres move closer to each other. For embossing it is important that the fibres remain in this compressed state even after the application of pressure. Due to the reduced distance between the paper fibres, embossing reduces the effective diameter of the holes formed in the paper. Embossing therefore reduces the porosity of the paper and accordingly its breathability. However, a defined breathability must be guaranteed for cigarette papers. The permeability of cigarette papers is defined as the measurement of the volume of air that flows through a specific area of ​​the cigarette paper in a given unit of time. Permeability is usually given in Coresta Units (CU). A Coresta unit is defined as "the volume of air that flows through 1 cm of substrate with a pressure difference of 1 kPa". 2 Volumetric flow rate of air passing through the sample (cm 3 min -1 For most cigarette papers, a pressure difference of 1 kPa will cause the paper to shrink by 1 cm 2 At least 20 cm passes through the sample 3 min -1 (or 20 C.U.) of air.

[0006] To meet the requirements to reduce the risk of fire, some countries require cigarettes to be self-extinguishing. The main feature that ensures the self-extinguishing of cigarettes is the controlled low air permeability of the cigarette paper. If the air permeability of the cigarette paper is low at least in some parts, the amount of air passing through the paper is not high enough to keep it burning, unless the user periodically strengthens the flame by inhaling.

[0007] However, it has been found that a higher porosity in the smoking article wrapper is advantageous in reducing the amount of nicotine, tar, and carbon monoxide in the cigarette. Furthermore, a higher porosity in the smoking article wrapper results in a slower burning cigarette.

[0008] In comparison, Applicant's experiments have demonstrated that perforated cigarette paper increases the amount of nicotine, tar, and carbon monoxide produced during cigarette consumption, as opposed to non-perforated porous cigarette paper having a similar CU value. Summary of the Invention [Problem to be solved by the invention]

[0009] It is therefore an object of the present invention to provide an embossed smoking article wrapper that provides a high average air permeability without the need for perforations, and a method for producing such a smoking article wrapper. It is a further object of the present invention to provide a smoking article comprising such a smoking article wrapper. [Means for solving the problem]

[0010] The problem is that a pressure difference of 1 kPa causes a 1 cm 2 The sample passes through 40-80cm 3 min -1 A smoking article wrapper comprising a non-perforated breathable base paper having a naturally high air porosity, the smoking article wrapper having at least one embossed surface area and at least one non-embossed surface area, the air permeability of the smoking article wrapper being such that the air permeability of the smoking article wrapper is 1 cm 2 of the smoking article wrapper at an applied pressure differential of 1 kPa. 2 Passing through the sample of ≧40cm 3 min -1 and the embossed area is resolved by a smoking article wrapper comprising an embossment having a depth of ≧16 μm.

[0011] It has been found that even embossing having a depth of ≧16 μm can be locally applied to the base paper without reducing the average volume flow rate below 40 CU. Thus, perforation is not required to maintain the average volume flow rate within a higher range where the amount of nicotine, tar, and carbon monoxide produced during cigarette consumption is lower. Furthermore, no additional equipment is required to perforate the smoking article wrapper to maintain a high average volume flow rate. A further advantage of smoking articles having such wrappers as the outer surface is that these smoking articles provide an improved visual appearance and can be easily recognized by consumers.

[0012] In a preferred embodiment of the smoking article wrapper, the smoking article wrapper has a pressure differential of 1 kP at 1 cm of the smoking article wrapper. 2 The sample passes through 40-60cm 3 min -1 This range of flow rates can be provided in combination with deep embossing, which has been found to allow for self-extinguishing of the smoking article in combination with a slow burn rate, thereby allowing for longer smoking times for the consumer.

[0013] In a preferred embodiment of the smoking article wrapper, the embossing has a depth in the range of 16 to 30 μm, preferably in the range of 18 to 28 μm, most preferably in the range of 19 to 25 μm. Embossing with this depth is advantageous because depths within the above mentioned ranges can be easily perceived visually and tactilely by consumers.

[0014] Embossing to the depth range described above provides a premium appearance without compromising handling characteristics.

[0015] In many cases, increased base paper basis weight correlates with lower CU values. In contrast, lighter weight base papers often have reduced embossing properties, either because they can be damaged during the embossing process or because the overall height of these papers is essentially too low to achieve deep embossing as defined above.2 It has been found that a base paper having a basis weight of 25 to 60 g / m2 is particularly suitable for producing a smoking article wrapper as defined above. Thus, in a preferred embodiment of the smoking article wrapper, the base paper has a basis weight of 25 to 60 g / m2. 2 , preferably 30 to 50 g / m 2 , more preferably 35 to 45 g / m 2 Base papers of this basis weight are not only particularly suitable for embossing, but also usually offer other advantageous features, such as sufficient opacity, to avoid localized shining of brownish tobacco through the cigarette paper, and therefore even to avoid an undesirable dirty or unhygienic appearance.

[0016] In order to avoid localized shining of brownish tobacco through the cigarette paper, the base paper is preferably provided with a filler. In a preferred embodiment of the smoking article wrapper, the filler content of the base paper is 30-60% (w / w), preferably 35-55% (w / w), more preferably 40-50% (w / w), and most preferably 40-47% (w / w).

[0017] In a preferred embodiment of the smoking article wrapper, the percentage of the embossed surface area is less than 50%, preferably less than 40%, more preferably less than 35%, and most preferably in the range of 5% to 35% of the total surface area of ​​the smoking article wrapper. Embossing of this size is preferred because these percentages allow for inscriptions and / or illustrations on the cigarette paper. Furthermore, the necessary breathability of the cigarette paper is maintained. A high percentage of embossed area may result, at least in some cases, in a reduced breathability of the cigarette paper, which may result in undesirable ignition of the cigarette.

[0018] In a preferred embodiment of the smoking article wrapper, the non-embossed surface area of ​​the base paper is such that 1 cm of the base paper is embossed with an applied pressure differential of 1 kPa. 2 The sample passes through 42-75cm 3 min -1, preferably 45 to 70 cm 3 min -1 It has been found that the breathability is sufficiently high, even after application of the embossing, that the average volumetric flow rate of air through the smoking article wrapper is sufficiently high to provide a longer burn time.

[0019] Further problems mentioned above are solved by a smoking article comprising a smoking article wrapper as described above. A smoking article comprising such a smoking article wrapper provides an enhanced visual appearance and can be easily recognized by consumers. It provides an appearance of high value and / or premium quality and can be easily recognized by consumers. By embossing, the applied structures, symbols, and / or characters can be recognized not only visually but also tactilely.

[0020] Base paper is 25~60g / m 2 , preferably 30 to 50 g / m 2 , more preferably 35 to 45 g / m 2 and / or comprising a filler, preferably with a filler content of 30-60% (w / w), preferably 35-55% (w / w), more preferably 40-50% (w / w), most preferably 40-47% (w / w), such a cigarette paper does not have transparent or translucent segments. Thus, such a smoking article does not have the drawback of the brownish tobacco color showing through the smoking article wrapper. Thus, brownish areas that are considered to be dirty or unhygienic are eliminated. This further enhances the appearance of high value and / or premium quality.

[0021] The smoking article preferably comprises a mouthpiece and an aerosol-generating substrate, the aerosol-generating substrate being encapsulated in a smoking article wrapper as described above. The aerosol-generating substrate is preferably tobacco or comprises tobacco. The aerosol-generating substrate is heated or combusted, thereby generating an aerosol. Encapsulating the aerosol-generating substrate in cigarette paper as described above provides the possibility of improving the optical appearance of the product and / or providing information to the consumer.

[0022] Smoking articles as described above preferably have a CO / tar value of 1 to 1.43. The high average breathability of the smoking article wrapper allows the CO / tar value to be maintained in this range even after application of localized pressure from the embossing procedure.

[0023] The tar level according to DIN ISO 4387:2018-09 for such smoking articles comprising an embossed wrapper as described above is preferably between 1 mg and 10 mg.

[0024] Another of the problems mentioned above is the breathability, which is measured by an applied pressure difference of 1 kPa through 1 cm of the smoking article wrapper. 2 Passing through the sample of ≧40cm 3 min -1 The problem is solved by a method for manufacturing a smoking article wrapper that provides an average volumetric flow rate of air of 1 cm 2 of the base paper with an applied pressure difference of 1 kPa. 2 The sample passes through 40-80cm 3 min -1The method includes the steps of providing a non-perforated breathable base paper having a naturally high porosity of air and generating an embossment having a depth of ≧16 μm by application of pressure to a part of the surface area of ​​the base paper. This method allows for the production of smoking articles with a high value and / or premium quality appearance at low cost. This method preferably does not require perforation of the base paper to maintain a high porosity of 40-80 CU. Since the information for the consumer can be applied by embossing, no additional substances such as pigments are required. However, application of further substances is possible, for example printing of symbols and / or letters, or application of substances to further enhance the high value and / or premium quality appearance.

[0025] In a preferred embodiment, the method includes the step of selecting a suitable base paper. The base paper is designed to be resistant to pressure drop of 1 cm 2 of the base paper with an applied pressure difference of 1 kPa. 2 The sample passes through 42-75cm 3 min -1 , preferably 45 to 70 cm 3 min -1 and / or provide a breathability in the range of average air volume flow of 25-60 g / m 2 , preferably 30 to 50 g / m 2 , more preferably 35 to 45 g / m 2 These base papers have been found to be particularly suitable for maintaining high breathability even after application of the localized embossing.

[0026] It is preferred to emboss less than 50%, preferably less than 40%, more preferably less than 35%, and most preferably between 5% and 35% of the total surface area of ​​the base paper, thereby allowing a high average air permeability to be maintained.

[0027] In a preferred embodiment of the method, the base paper is embossed with a pressure of at least 4 MPa, preferably 5-15 MPa, more preferably 6-12 MPa. This pressure was found to be sufficient to produce a deep embossment in the base paper with a depth of ≧16 μm. However, this pressure does not result in the closure of all the pores of the base paper. Thus, a sufficiently high air permeability could be maintained even in the embossed segments.

[0028] All disclosed features relating to the method shall apply mutatis mutandis to the smoking article wrapper and / or smoking article, and all disclosed features relating to the smoking article wrapper and / or smoking article shall apply mutatis mutandis to the method.

[0029] Another of the above problems is solved by a method of manufacturing a smoking article comprising a smoking article wrapper according to any of the previous embodiments, the method comprising: - producing a smoking article wrapper by at least one of the preceding methods; - providing a mouthpiece and an aerosol-generating substrate; - encapsulating the aerosol-generating substrate in a smoking article wrapper.

[0030] Further advantages, objects and features of the present invention will be explained, by way of example only, in the following description with reference to the accompanying drawings in which similar components in different embodiments may bear the same reference symbols, and in which: [Brief description of the drawings]

[0031] [Figure 1a] 1 is a diagram of an exemplary embodiment of a smoking article wrapper according to the present invention. [Figure 1b] FIG. 1b is a diagram of an exemplary smoking article wrapper similar to that of FIG. 1a, but having a shallower embossed pattern. [Figure 2a] 3A-3C are diagrams of further exemplary embodiments of smoking article wrappers according to the present invention; [Figure 2b]2b is a diagram of a further exemplary smoking article wrapper similar to that of FIG. 2a, but having a shallower embossed pattern. [Figure 3a] Detail of the embossing as shown in Figure 1a. [Figure 3b] 3b shows the height profile of a smoking article wrapper as shown in FIG. 3a along the indicated path 13. FIG. [Figure 4a] Detail of the embossing as shown in Figure 2b. [Figure 4b] 4b shows the height profile of a smoking article wrapper as shown in FIG. 4a along the indicated path 13. FIG. [Diagram 5] 1 is a diagram illustrating the relationship between the porosity of a smoking article wrapper and its surface area covered by embossed features. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0032] FIG. 1a shows a diagram of an exemplary embodiment of a smoking article wrapper 1 according to the present invention. To obtain the photograph of FIG. 1a, the smoking article wrapper 1 was illuminated from the backside. Thus, FIG. 1a can give a hint about the opacity of different areas of the smoking article wrapper 1. In FIG. 1a, only a small sample of the smoking article wrapper 1 is shown. Such a smoking article wrapper 1 may be part of a smoking article. Typically, such a smoking article wrapper 1 is made as a continuous band of paper-based material that is wound on a bobbin or equivalent reel. During the manufacture of smoking articles such as cigarettes, the band is unwound in a smoking article machine to encapsulate a continuous strand of aerosol-generating material, e.g., tobacco material, which is then cut into rods to form a plurality of smoking articles.

[0033] The illustrated smoking article wrapper 1 has an embossment. The embossing pattern 10 is composed of a number of parallel lines 11. Due to the pressure applied during the embossing procedure, the base paper material is highly compressed in these areas. In the embossed areas 11, light does not shine through the smoking article wrapper 1 as much. These areas are therefore darker than the non-embossed areas 12. Due to the depth of the embossing and the high compression of the base paper material in these areas, the embossed lines 11 appear uniformly black. In contrast, the non-embossed areas 12 are less homogeneous due to the disordered arrangement of the base paper substrate fibers. The fibers of the base paper material are stacked higher in some areas than in others, so less light is transmitted in these areas. Due to the higher amount of light absorbing material placed in these areas, these areas appear darker than other areas.

[0034] Figure 1b shows an image of an exemplary smoking article wrapper 1 having a similar or even identical embossed pattern 10 as the smoking article wrapper shown in Figure 1a. However, the depth of the embossments 11 is shallower. The pressure used to apply the embossments 10 was lower than that used to apply the embossments 10 as shown in Figure 1a. As a result of the reduced pressure, the contrast in light transmission between the embossed areas 11 and the non-embossed areas 12 is low. In contrast to the smoking article wrapper shown in Figure 1a, the embossed lines 11 appear brighter and they are often disconnected.

[0035] Due to the higher contrast and improved tactile properties of the deeper embossing, smoking articles with wrappers having such embossing may appear more valuable to consumers of the smoking article. A premium appearance can be established.

[0036] Figures 2a and 2b show a further exemplary embodiment of a smoking article wrapper 1 according to the invention. Similar to the embodiment shown in Figure 1a, the smoking article wrapper 1 is illuminated from the backside, making it possible to see the opacity of different areas 11, 12 of the smoking article wrapper 1. The embossing pattern 10 differs from the pattern shown in Figures 1a and 1b. It consists of a number of lines 11 forming the letter "W".

[0037] Similar to Figures 1a and 1b, the embossment shown in Figure 2a is also applied with a higher pressure than that shown in Figure 2b. Due to the higher pressure for the application of the embossment 10 shown in Figure 2a, the letter "W" is well discernible in Figure 2a. In Figure 2b, the letter "W" can only be discerned in some areas. The contrast is low, especially at the ends of each line and in the areas where the lines approach each other.

[0038] A detailed analysis of the height profile of a smoking article wrapper 1 according to the invention is shown in Figures 3a-4b. Figure 3a shows in more detail a cut-out of a smoking article wrapper 1 as shown in Figure 1a. Figure 4a shows in more detail a cut-out of a smoking article wrapper 1 as shown in Figure 2b. At this higher magnification, the embossing pattern 10 can be clearly recognized for both examples. The lines 11 appear dark in contrast to the non-embossed areas 12. In the non-embossed areas even single fibers of the base paper can be recognized. Due to the disorderly arrangement of these fibers, the transmitted light in the non-embossed areas 12 is irregular and these areas 12 appear irregular.

[0039] FIG. 3b shows a diagram showing the height profile of the smoking article wrapper 1 as shown in FIG. 3a along the indicated path 13. The abscissa indicates the distance (in mm) along the path 13 (in FIG. 3a) and the ordinate indicates the height (in μm) of the smoking article wrapper 1 at each point. As can already be assumed due to the non-uniform opacity, the height of the non-embossed areas 12 of the smoking article wrapper 1 varies along the path 13. However, the height is mostly in the range between about 25 μm and 35 μm. The height of the embossed areas 11 is lower. Also, the variation in height is smaller in this area. Thus, the height of the embossed areas 12 is mainly in the range between about 12 and 14 μm. This also explains the very uniform opacity of the embossing as shown in FIG. 1a.

[0040] FIG. 4b shows a diagram showing the height profile of the smoking article wrapper 1 as shown in FIG. 4a along the indicated path 13. As in FIG. 3b, the abscissa indicates the distance (in mm) along the path 13 (in FIG. 4a) and the ordinate indicates the height (in μm) of the smoking article wrapper 1 at each point. Compared to the diagram in FIG. 3a, the height of the non-embossed areas 12 is even more irregular. Also, the height of the embossed areas 11 is lower. Approximating the height profile of the embossed areas results in a curved profile with a maximum height at or near the center of each embossed structure. The height of the non-embossed areas 12 is reduced in the area where the two embossed areas 11 are close to each other. This may be caused by compression of the base paper by the application of pressure on both sides of the non-embossed areas 12. However, the non-embossed areas 12 are still visible due to their uneven height. In contrast, the embossed areas 11 are smoother and have a lower average height. However, for the smoking article wrapper 1 as shown in Fig. 4a, the height ranges of the embossed areas 11 as well as the non-embossed areas 12 are wider than those of the smoking article wrapper 1 as shown in Fig. 3a. The range of the non-embossed areas extends between about 17 μm and 38 μm, and the range of the embossed areas extends between about 10 μm and 22 μm. These wider ranges and their partial overlap result in a lower visual and tactile perceptibility of the embossment 10 on the surface of the smoking article wrapper 1. Therefore, products comprising such smoking article wrappers 1 are usually considered to be of lower value by consumers and fail to establish a premium appearance.

[0041] Figure 5 shows the relationship between the porosity of a smoking article wrapper and its surface area covered by an embossing pattern according to Figure 1 or 2. Since the fibres of the base paper are compressed during and after the application of the embossing, the pores between the fibres are closed. The closed pore area is strongly dependent on the applied pressure. Moreover, the embossing pattern has an influence on the closed pore area. However, as can be derived from Figure 5, the effect of the pattern is strongly dependent on the applied pressure.

[0042] Any unembossed base paper has a porosity of about 62 CU. As explained above, this porosity decreases after the application of the embossing. The decrease in porosity depends on the applied pressure. After embossing with a pressure of 120 bar (circle), the porosity decreases significantly. This decrease in porosity is almost independent of the applied pattern (unfilled circle (parallel lines) vs. filled dots ("W" pattern)). Based on the measurement points, a polynomial approximation gives the respective curves (dotted line (parallel lines) vs. solid line ("W" pattern). Both curves are very similar, with only slight differences in porosity. This can be easily explained by the assumption that at high pressure all the pores of the base paper are closed, independent of the pattern.

[0043] In contrast, the embossing pattern has an effect on the porosity when applied at medium to high pressures. Based on the measurement points of the porosity of the smoking article wrapper 1 after application of the embossing at 60 bar (shown as grey unfilled squares (parallel lines) vs grey filled squares ("W" pattern), a polynomial approximation curve was calculated (--- (parallel lines) vs -·-·- ("W" pattern)). The shapes of both curves are different from each other. For both curves (60 bar), the porosity is always higher than both curves, showing the trend of the porosity after embossing at 120 bar.

[0044] It should further be noted that the figures describe features that may be advantageous individually. Those skilled in the art will readily recognize that a particular feature disclosed in a figure may be advantageous without incorporating additional features of that figure. Moreover, those skilled in the art will recognize that advantages may develop from a combination of various features disclosed in one or various figures. [Explanation of symbols]

[0045] 1. Smoking article wrappers 10 Patterns 11 Embossed Surface Area 12 Non-embossed surface area 13 Passage

Claims

1. With an applied pressure difference of 1 kPa, the thickness of the base paper is 1 cm ２ 40-80cm passing through the sample ３ A smoking article wrapper (1) comprising a non-perforated breathable base paper having a naturally high porosity of 100 / min, the wrapper having at least one embossed surface area (11) and at least one non-embossed surface area (12); The air permeability of the smoking article wrapper (1) is such that the air permeability of the smoking article wrapper (1) is 1 cm ２ ≧40 cm ３ / min, and wherein said embossed surface area (11) has embossments with a depth of ≧16 μm.

2. The smoking article wrapper is configured such that an applied pressure differential of 1 kPa reduces the thickness of the smoking article wrapper by 1 cm ２ The sample passes through 40 to 60 cm ３ min －１ 2. The smoking article wrapper (1) according to claim 1, characterized in that it provides a breathability in the range of a mean volumetric flow rate of air of 0.1 to 0.5 mm.

3. Smoking article wrapper (1) according to claim 1 or 2, characterized in that the embossing has a depth in the range of 16 to 30 μm.

4. The base paper has a thickness of 25 to 60 g / m ２ 4. A smoking article wrapper (1) according to any one of claims 1 to 3, characterized in that it has a basis weight of

5. The non-embossed surface area (12) of the base paper is embossed to a pressure of 1 cm of the base paper with an applied pressure difference of 1 kPa. ２ 42-75cm passing through the sample ３ min －１ 5. A smoking article wrapper (1) according to any one of claims 1 to 4, characterized in that it provides a breathability in the range of a mean volumetric flow rate of air of 0.1 to 0.5 wt.

6. 6. A smoking article wrapper (1) according to any one of claims 1 to 5, characterized in that the base paper comprises a filler, the filler content being 30-60% (w / w).

7. 7. A smoking article wrapper (1) according to any one of claims 1 to 6, characterized in that the percentage of the embossed surface area (11) is less than 50% of the total surface area of ​​the smoking article wrapper.

8. A smoking article comprising a smoking article wrapper (1) according to any one of claims 1 to 7.

9. 9. A smoking article according to claim 8, comprising a mouthpiece and an aerosol-generating substrate, the aerosol-generating substrate being enveloped in a smoking article wrapper (1) according to any one of claims 1 to 7.

10. 10. A smoking article according to claim 8 or 9, characterized in that its CO / tar value is between 1 and 1.

43.

11. Smoking article according to any one of claims 8 to 10, characterized in that its tar level according to DIN ISO 4387: 2018-09 is between 1 mg and 10 mg.

12. The air permeability is such that the applied pressure difference of 1 kPa is 1 cm ２ ≧40 cm ３ min －１ 1. A method for producing a smoking article wrapper (1) that provides an average volumetric flow rate of air of With an applied pressure difference of 1 kPa, the thickness of this base paper is 1 cm ２ 40-80cm passing through the sample ３ min －１ providing a non-perforated breathable base paper having a naturally high porosity for air; - creating an embossment having a depth of ≥ 16 μm by application of pressure to a portion of the surface area (11) of said base paper; The method according to claim 1, further comprising:

13. With an applied pressure difference of 1 kPa, 1 cm ２ 42-75cm passing through the sample ３ min －１ and / or provide a breathability in the range of an average volumetric flow rate of air of 25 to 60 g / m ２ 13. The method of claim 12, wherein the sheet has a basis weight of

14. 14. The method according to claim 12 or 13, characterized in that less than 50% of the total surface area of ​​the base paper is embossed.

15. 15. The method according to any one of claims 12 to 14, wherein the base paper is embossed with a pressure of at least 4 MPa.

16. A method for producing a smoking article comprising a smoking article wrapper (1) according to any one of claims 1 to 7, comprising the steps of:

16. A method comprising the steps of: producing a smoking article wrapper (1) by the method of any one of claims 12 to 15; providing a mouthpiece and an aerosol-generating substrate; and encapsulating the aerosol-generating substrate in the smoking article wrapper (1).

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