Method for producing a wrapping paper for smoking articles having a haptic effect

Abstract

The invention relates to a method for producing a wrapping paper for a smoking article, comprising the following steps A-G: A - providing an aqueous suspension comprising pulp fibers, wherein at least 70% of the mass of the solids in the suspension is formed by pulp fibers, B - dewatering the suspension on a circulating screen, in order to form a paper web, C - pressing the paper web between at least one pair of rotating rollers against a circulating felt, such that the water content of the paper web is at least 40% and at most 80%, D - pushing the paper web together by means of a creping doctor, E - pressing the paper web between at least one pair of rotating rollers against a circulating felt, F - drying the paper web in order to obtain a wrapping paper for smoking articles, G - rolling up the wrapping paper for smoking articles, wherein the water content of the paper web at the beginning of step D is at least 40%, and wherein, after step G, the wrapping paper for smoking articles has, on at least one side, a Bekk smoothness of at most 20.0 s.

Description

[0001] delfortgroup AG

[0002] D31951WO

[0003] METHOD FOR PRODUCING A WRAPPING PAPER FOR SMOKING PRODUCTS WITH A HAPTIC EFFECT

[0004] AREA OF INVENTION

[0005] The invention relates to a method for producing wrapping paper for a smoking product, which is given an exceptionally low smoothness by this method. This low smoothness creates a special tactile effect on the wrapping paper and the smoking product made from it, especially if the wrapping paper is additionally embossed.

[0006] BACKGROUND AND STATE OF THE ART

[0007] Smoking articles are typically rod-shaped articles consisting of at least two rod-shaped segments arranged one after the other. One segment contains a material capable of forming an aerosol when heated, and at least one other segment contains a material that serves to influence the properties of the aerosol.

[0008] The smoking product can be a filter cigarette, in which a first segment contains the aerosol-forming material, especially tobacco, and a second segment, designed as a filter, serves to filter the aerosol. The aerosol is produced by burning the aerosol-forming material, and the filter primarily serves to filter the aerosol and to give the filter cigarette a defined draw resistance. Smoking products can also be cigarettes without filters.

[0009] The smoking product in question can also be a tobacco heater (also known as a "heated tobacco product" according to ISO 6080:2024), in which the aerosol-forming material is heated but not burned. This heating is achieved by a separate heat source, which may be an integral part of the tobacco heater or provided by a separate heating device, forming a tobacco heating system together with the tobacco heater. This reduces the number and quantity of harmful substances in the aerosol. Such a smoking product also consists of at least two, but more often of several, particularly three, four, or five segments. One segment contains the aerosol-forming material, which typically comprises tobacco, reconstituted tobacco, tobacco processed by other methods, or nicotine and glycerol or propylene glycol.Other, partially optional segments in the tobacco heater serve to direct the aerosol, cool the aerosol, or filter the aerosol.

[0010] The segments of a smoking product are usually encased in a wrapping material. Paper is very often used as this wrapping material. In particular, the outermost wrapping of a smoking product is often made of paper.

[0011] Since the consumer comes into contact with the outer wrapping of the smoking product with their fingers or lips, haptic properties play a significant role alongside visual ones. Haptic properties can be influenced, for example, by embossing, calendering, or coating the wrapping paper. However, these processes usually require additional production steps and cannot cover the entire spectrum of tactile impressions that would be desirable for smoking products.

[0012] Therefore, there is an interest in the industry to further expand the range of haptic impressions offered by wrapping paper for smoking products.

[0013] SUMMARY OF THE INVENTION

[0014] The invention is based on the objective of providing a method for producing wrapping paper for smoking products that gives the wrapping paper a special tactile effect. A further objective of the invention is to provide such wrapping paper, as well as a smoking product with this wrapping paper.

[0015] This problem is solved by a method for producing a wrapping paper according to claim 1, a wrapping paper according to claim 27, and a smoking article according to claim 47. Advantageous embodiments are specified in the dependent claims.

[0016] The inventors have discovered that a particularly low smoothness gives the wrapping paper a special tactile effect. However, such a low smoothness cannot be easily achieved on wrapping papers for smoking products. According to the prior art, the wrapping paper passes through several roller systems during production on the paper machine, for example, in the press section or the dryer section. During this process, the paper is smoothed automatically, a process referred to in the field as "machine smooth," so that, at least for wrapping papers for smoking products, a Bekk smoothness of at least 30.0 s, measured according to ISO 5Ö27:1995 / Cor 1:2002, is achieved. The inventors have now discovered that, using a crepe scraper in the press section of the paper machine, a wrapping paper can be produced with a significantly lower Bekk smoothness, at most 20.0 s.This position of the crepe scraper in the paper machine is highly unusual for experts, as they assume that the paper must be at least slightly dry before it can be subjected to the stresses of a crepe scraper. Crepe scrapers are therefore usually only used in the drying section of the paper machine.

[0017] The process according to the invention does not involve creping the paper, and the wrapping paper produced by this process has entirely different properties than creped papers. In creping, the paper structure is already partially solidified by drying, and then the paper web is compressed. These creped papers have a very high elongation at break and therefore a very low modulus of elasticity. They are unsuitable as wrapping paper because the paper is under tension during processing, and a creped paper would yield to this tension with excessive deformation. Apart from the problems that would arise during the manufacture of the smoking product, the creped structure would at least partially disappear during production, and the paper on the smoking product would lack both the desired smoothness and tactile effect.

[0018] In contrast, according to the inventive method, the paper web is first compressed using the crepe scraper and only then solidified by drying. The resulting elongation at break is much lower than that of known creped papers and lies within the usual range of non-creped papers, and the structure of the wrapping paper is so stable that there are no problems when processing the wrapping paper into a smoking product, and the low smoothness and the special tactile effect are retained.

[0019] The inventive method for producing a wrapping paper for a smoking product therefore comprises the following steps AG.

[0020] A - Providing an aqueous suspension comprising cellulose fibers, wherein at least 70% of the mass of the solids in the suspension are formed by cellulose fibers, B - Dewatering the suspension on a circulating screen to form a paper web, C - Pressing the paper web between at least one pair of rotating rollers against a circulating felt, such that the water content of the paper web is at least 40% and at most 80%,

[0021] D - Pushing the paper web together using a crepe scraper,

[0022] E - Pressing the paper web between at least one pair of rotating rollers against a circulating felt, F - Drying the paper web to obtain wrapping paper for smoking products, G - Rolling up the wrapping paper for smoking products,

[0023] wherein the water content of the paper web at the beginning of step D is at least 40%, and wherein the wrapping paper for smoking articles has a smoothness according to Bekk of at most 20.0 s on at least one side after step G.

[0024] The inventors have found that the desired low smoothness can be achieved by collapsing the paper web using a crepe scraper in the press section of a paper machine. However, the paper web must be prepared appropriately to allow for efficient collapsing at typical production speeds. This is accomplished by adjusting the water content of the paper web to the inventive interval through dewatering in step A and pressing in step B. If the water content is too high, tears are to be expected during collapsing in step D due to the low strength of the paper web. Conversely, if the water content is too low, the paper web is no longer sufficiently formable to achieve the desired low smoothness and other relevant properties, such as elongation at break and stable paper structure, during collapsing in step D.

[0025] In preferred embodiments, the paper web is not artificially dried between step C and step D. "Artificially dried" means that heat is artificially or deliberately applied to the paper web, for example, by convection (such as the supply of hot air) or by radiation. This term distinguishes it from natural drying, which occurs, for example, simply from the paper web being exposed to the ambient air at the production site. According to the inventors, drying by artificially applying heat through convection, conduction, or radiation is unsuitable for preparing the paper web for collating in step D because it strengthens the paper web's structure too much.

[0026] The aqueous suspension in step A comprises cellulose fibers. The cellulose fibers serve to impart strength to the paper web, making it well-suited as wrapping paper for smoking products. According to the invention, at least 70%, preferably at least 80%, particularly preferably at least 90%, and especially at least 95% of the mass of the solids in the suspension are formed by cellulose fibers. In a particularly specific embodiment, apart from the usual additives and processing aids, the solids in the suspension are formed exclusively by cellulose fibers.

[0027] Pulp fibers can come from various sources. Preferred pulp fibers are derived from coniferous trees such as spruce, pine, or fir; deciduous trees such as birch, beech, or eucalyptus; or other plants such as hemp, flax, jute, ramie, kenaf, kapok, coconut, abaca, sisal, bamboo, cotton, or esparto grass; or they are a mixture of pulp fibers obtained from two or more of these trees or plants.

[0028] The aqueous suspension in step A may contain filler. Filler can increase the whiteness or opacity and thus improve the optical appearance of the wrapping paper. However, according to the inventive method, a good optical appearance can also be achieved with a low filler content or even without any filler at all, such that preferably the filler constitutes at most 30%, more preferably at most 20%, and most preferably at most 10% of the mass of solids in the suspension. In a particular embodiment of the method, the filler constitutes at least 1% and at most 10% of the mass of solids in the aqueous suspension in step A.

[0029] Preferably the filler is selected from the group consisting of calcium carbonate, magnesium carbonate, titanium dioxide, magnesium oxide, magnesium hydroxide, aluminum hydroxide, magnesium silicate, aluminum silicate, kaolin, talc, and bentonite, or is formed by a mixture of two or more of these filler types.

[0030] The dewatering of the suspension in step B can be carried out according to the methods commonly used in papermaking; in particular, the dewatering can be assisted by a vacuum generated by suction boxes or suitably shaped vanes.

[0031] In step C, the paper web is pressed against a rotating felt such that the web passes through at least one pair of rotating rollers and is pressed against a felt between the rollers. Particularly preferably, the paper web is pressed by exactly two pairs of rotating rollers in step C.

[0032] According to the invention, the pressing of the paper web in step C is carried out such that the water content of the paper web after pressing in step C is at least 40% and at most 80%, preferably at least 45% and at most 75%, and particularly preferably at least 50% and at most 70%. According to the inventors' findings, this water content has proven to be particularly advantageous for the collating in step D.

[0033] Preferably, the water content of the paper web at the beginning of step D is at least 40% and at most 80%, particularly preferably at least 45% and at most 75%, and most preferably at least 50% and at most 70%. The crepe scraper in step D can be a crepe scraper of the type otherwise used for creping papers known from the prior art.

[0034] The pressing of the paper web in step E can be carried out according to the methods commonly used in papermaking.

[0035] Drying the paper web in step F can be carried out using methods commonly used in papermaking. Preferably, drying in step F is contactless or by contact with at least one heated drying cylinder. Particularly preferred is contactless drying in step F to avoid increasing the smoothness of the paper web. Most preferably, drying in step F is carried out at least partially by hot air, infrared radiation, or microwave radiation. In a particularly preferred embodiment, drying is carried out exclusively by hot air, infrared radiation, or microwave radiation. The drying process strengthens the paper web, resulting in a wrapping paper for smoking products.

[0036] The low smoothness of the wrapping paper allows for a very special effect when the wrapping paper is additionally embossed. The embossing is significantly more noticeable both visually and to the touch than with wrapping papers of typical smoothness. Therefore, the process preferably includes an additional embossing step of the paper web from step E between steps E and F.

[0037] The pattern embossed into the paper web in this additional embossing step can be arbitrary. Preferably, the pattern includes lines, logos, and / or lettering. Particularly preferably, the pattern includes a multitude of parallel lines, for example, verge lines, in any direction on the paper web.

[0038] The rolling up of the wrapping paper in step G can be carried out according to the methods commonly used in papermaking.

[0039] According to the invention, the smoothness of the wrapping paper after step G, as measured by Bekk, is at most 20.0 s on at least one side, preferably at most 15.0 s, particularly preferably at most 10.0 s and most preferably at most 7.0 s.

[0040] The Bekk smoothness is determined according to ISO 5627:1995 / Cor 1:2002. This measurement method is recommended for a smoothness of at least 4.0 s. However, since the only objective of this invention is to achieve the lowest possible smoothness, this limitation is irrelevant. Therefore, methods are also in accordance with the invention in which the Bekk smoothness of the wrapping paper after step G is less than 4.0 s and the Bekk smoothness was measured according to ISO 5627:1995 / 00 R 1:2002.

[0041] For a special haptic effect, however, it is not necessary to reduce the smoothness arbitrarily; preferably, the smoothness according to Bekk of the wrapping paper after step G on at least one side is therefore at least 4.0 s and at most 20.0 s, particularly preferably at least 4.0 s and at most 15.0 s, most particularly preferably at least 4.0 s and at most 10.0 s and in particular at least 4.0 s and at most 7.0 s.

[0042] A particular advantage of the method according to the invention is that the smoothness on both sides of the wrapping paper can be low. Preferably, the smoothness according to Bekk on both sides of the wrapping paper is therefore at most 20.0 s, particularly preferably at most 15.0 s, most preferably at most 10.0 s, and particularly preferably at most 7.0 s. Even in this case, it is not necessary to reduce the smoothness arbitrarily; preferably, the smoothness according to Bekk on both sides of the wrapping paper after step G is therefore at least 4.0 s and at most 20.0 s, particularly preferably at least 4.0 s and at most 15.0 s, most preferably at least 4.0 s and at most 10.0 s, and particularly preferably at least 4.0 s and at most 7.0 s.

[0043] Another special effect of the process according to the invention is that the smoothness of both sides of the wrapping paper is approximately the same. This is generally not achievable in conventional papermaking, which is why those skilled in the art usually distinguish between a smooth top side and a less smooth screen side. For the process according to the invention, the wrapping paper after step G preferably has the property that the Bekk smoothness of one side of the wrapping paper differs from the Bekk smoothness of the other side of the wrapping paper by no more than 4.0 s, particularly preferably by no more than 3.0 s, most preferably by no more than 2.0 s, and particularly preferably by no more than 1.0 s.

[0044] Another special effect of the method according to the invention is that the smoothness is particularly homogeneous with respect to the surface of the wrapping paper. Therefore, the standard deviation of the smoothness according to Bekk for at least one side of the wrapping paper after step G is preferably at most 4.0 s, more preferably at most 3.0 s, and most preferably at most 2.5 s. In this case, too, the special effect can occur for both sides of the wrapping paper, so that the standard deviation of the smoothness according to Bekk for both sides of the wrapping paper after step G is preferably at most 4.0 s, more preferably at most 3.0 s, and most preferably at most 2.5 s. The standard deviation of the smoothness according to Bekk for the two sides of the wrapping paper can be the same or different.

[0045] The standard deviation of the Bekk smoothness of one side of the wrapping paper is determined by 10 measurements of the Bekk smoothness on non-overlapping test areas of that side of the wrapping paper.

[0046] The wrapping paper according to step G preferably has a basis weight according to ISO 536:2019 of at least 20 g / m². 2 and at most 100 g / m² 2 , particularly preferably of at least 25 g / m² 2 and at most 80 g / m² 2 and especially preferably of at least 30 g / m² 2 and at most 70 g / m² 2 These basis weights have proven particularly advantageous for wrapping paper for smoking products. They offer a favorable compromise between material consumption, influence on taste, stiffness, and strength of the wrapping paper.

[0047] The wrapping paper according to step G preferably has a thickness according to ISO 534:2011 of at least 40 pm and at most 200 pm, particularly preferably at least 60 pm and at most 150 pm, and most preferably at least 80 pm and at most 120 pm. The thickness influences the hardness of the smoking product made from the wrapping paper and also the processability of the wrapping paper. The preferred ranges allow for a particularly favorable compromise with material costs.

[0048] The wrapping paper according to step G preferably has an air permeability according to ISO 2965:2019 measured at a pressure difference of 1 kPa over a minimum of 10 cm. 3 / (min-cm 2 ) and at most 150 cm 3 / (min-cm 2 ), particularly preferably of at least 20 cm 3 / (min-cm 2 ) and at most 100 cm 3 / (min-cm 2 ) and especially preferably at least 40 cm 3 / (min-cm 2) and at most 90 cm 3 / (min-cm 2 In a particularly preferred embodiment, the air permeability according to ISO 2965:2019, measured at a pressure difference of 1 kPa, is at least 50 cm². 3 / (min-cm 2 ) and at most 80 cm 3 / (min-cm 2 ). It is an exceptional feature of the process that the air permeability is relatively high despite the paper web being compressed in step D, making it very suitable for smoking products.

[0049] The wrapping paper according to step G preferably has a tensile strength according to ISO 1924-2:2008 of at least 10 N / mm and at most 80 N / 15 mm, particularly preferably at least 15 N / 15 mm and at most 70 N / 15 mm, and most preferably at least 20 N / 15 mm and at most 50 N / 15 mm. For processing the wrapping paper into a smoking product, it is advantageous if the tensile strength exceeds a certain value. However, a high tensile strength means higher material consumption or higher energy consumption during the refining of the cellulose fibers, so it is not preferred to increase the tensile strength beyond a certain limit.

[0050] The wrapping paper produced according to step G can exhibit a characteristically low elongation at break compared to creped papers when processed according to the invention. The elongation at break is measured according to ISO 1924-2:2008. The elongation at break depends on the direction in which the sample was removed from the wrapping paper, and it can be characteristic of the wrapping paper produced according to step G that the elongation at break is low in every direction compared to creped papers. A distinction is made between the machine direction, which is the direction in which the paper web runs through the paper machine during production, and the transverse direction, which is the direction orthogonal to the machine direction and lying in the plane of the paper web. Furthermore, the elongation at break in the direction of the angular perpendicular between the machine direction and the transverse direction (the "45° direction") is also significant.

[0051] The elongation at break of the wrapping paper after step G is preferably at least 2.0% and at most 8.0% in the machine direction, in the transverse direction and in a 45° direction thereto, more preferably at least 3.0% and at most 7.0% and most preferably at least 4.0% and at most 6.0%.

[0052] The optical properties of the wrapping paper on a smoking product are of great importance to the consumer, in addition to its tactile properties. Generally, high whiteness and high opacity are desirable because they signal high quality and prevent the aerosol-forming material and other components of the smoking product from being visible through the wrapping paper. Particularly when the smoking product is a tobacco heater, the wrapping paper should remain essentially white and free of stains even after use. A special effect of the inventive method is that high opacity and whiteness can be achieved even without filler in the wrapping paper. This is partly due to the surface structure.The wrapping paper according to step G therefore preferably has a whiteness (ISO brightness) according to ISO 2470-1:2016 of at least 80% and at most 105% on at least one side, particularly preferably at least 82% and at most 100%, and most preferably at least 83% and at most 90%. The wrapping paper according to step G preferably has an opacity according to ISO 2471:2008 of at least 50% and at most 90%, particularly preferably at least 55% and at most 85%, and most preferably at least 58% and at most 75%.

[0053] Another aspect of the invention relates to a wrapping paper for smoking products with a particularly low smoothness. Such a wrapping paper is particularly obtainable by production according to a method based on one of the embodiments described above, which allows the wrapping paper to be endowed with a particularly low smoothness. Regardless of the method, the wrapping paper according to this aspect of the invention is characterized by the properties mentioned below, in particular the low smoothness, and not by the method of its production.

[0054] The wrapping paper according to the invention comprises cellulose fibers, wherein at least 70% of the mass of the wrapping paper is formed by cellulose fibers, and wherein the smoothness according to Bekk on at least one side of the wrapping paper is at most 20.0 s, and wherein the elongation at break of the wrapping paper in the machine direction, in the transverse direction and in a 45° direction thereto is at least 2.0% and at most 8.0%.

[0055] Preferably, at least 80%, particularly preferably at least 90%, and most preferably at least 95% of the mass of the wrapping paper is formed by cellulose fibers. In a very particular embodiment, apart from the usual additives, the wrapping paper is formed exclusively by cellulose fibers.

[0056] The cellulose fibers can originate from one or more sources, which are named in relation to the cellulose fibers in the suspension.

[0057] The wrapping paper may contain filler. Preferably, filler comprises at most 30%, more preferably at most 20%, and most preferably at most 10% of the mass of the wrapping paper. In a particular embodiment of the wrapping paper, the filler constitutes at least 1% and at most 10% of the mass of the wrapping paper.

[0058] The filler can come from one or more sources, which are mentioned in relation to the suspension.

[0059] According to the invention, the Bekk smoothness of the wrapping paper on at least one side is at most 20.0 s, preferably at most 15.0 s, particularly preferably at most 10.0 s and most preferably at most 7.0 s. Preferably, the Bekk smoothness of the wrapping paper on at least one side is at least 4.0 s and at most 20.0 s, particularly preferably at least 4.0 s and at most 15.0 s, most preferably at least 4.0 s and at most 10.0 s and particularly at least 4.0 s and at most 7.0 s.

[0060] Preferably, the smoothness according to Bekk of both sides of the wrapping paper is at most 20.0 s, particularly preferably at most 15.0 s, very preferably at most 10.0 s, and particularly preferably at most 7.0 s. Preferably, the smoothness according to Bekk of both sides of the wrapping paper after step G is at least 4.0 s and at most 20.0 s, particularly preferably at least 4.0 s and at most 15.0 s, very preferably at least 4.0 s and at most 10 s, and particularly preferably at least 4.0 s and at most 7.0 s.

[0061] Preferably, the wrapping paper has the property that the smoothness according to Bekk of one side of the wrapping paper differs from the smoothness according to Bekk of the other side of the wrapping paper by no more than 4.0 s, particularly preferably by no more than 3.0 s, most preferably by no more than 2.0 s and particularly by no more than 1.0 s.

[0062] Preferably, the standard deviation of the Bekk smoothness on at least one side of the wrapping paper is at most 4.0 s, particularly preferably at most 3.0 s, and most preferably at most 2.5 s. Preferably, the standard deviation of the Bekk smoothness on both sides of the wrapping paper is at most 4.0 s, particularly preferably at most 3.0 s, and most preferably at most 2.5 s.

[0063] The elongation at break of the wrapping paper is preferably at least 3.0% and at most 7.0%, particularly preferably at least 4.0% and at most 6.0%, in the machine direction, in the transverse direction and in a 45° direction thereto.

[0064] The wrapping paper preferably has a basis weight according to ISO 536:2019 of at least 20 g / m². 2 and at most 100 g / m² 2 , particularly preferably of at least 25 g / m² 2 and at most 80 g / m² 2 and especially preferably of at least 30 g / m² 2 and at most 70 g / m²2 on.

[0065] The wrapping paper preferably has a thickness according to ISO 534:2011 of at least 40 pm and at most 200 pm, particularly preferably at least 60 pm and at most 150 pm and most preferably at least 80 pm and at most 120 pm.

[0066] The wrapping paper preferably has an air permeability according to ISO 2965:2019, measured at a pressure difference of 1 kPa over a distance of at least 10 cm. 3 / (min-cm 2 ) and at most 150cm 3 / (min-cm 2 ), especially preferably at least 20 cm 3 / (min-cm 2 ) and at most 100 cm 3 / (min-cm 2 ) and especially preferably at least 40 cm 3 / (min-cm 2 ) and at most 90 cm 3 / (min-cm 2 In a particularly preferred embodiment, the air permeability according to ISO 2965:2019, measured at a pressure difference of 1 kPa, is at least 50 cm². 3 / (min-cm2 ) and at most 80 cm 3 / (min-cm 2 ).

[0067] The wrapping paper preferably has a tensile strength according to ISO 1924-2:2008 of at least 10 N / 15 mm and at most 80 N / 15 mm, particularly preferably at least 15 N / 15 mm and at most 70 N / 15 mm and most preferably at least 20 N / 15 mm and at most 50 N / 15 mm.

[0068] Preferably, the wrapping paper has a whiteness (ISO brightness) on at least one side of at least 80% and at most 105% according to ISO 2470-1:2016, particularly preferably at least 82% and at most 100%, and most preferably at least 83% and at most 90%. The wrapping paper preferably has an opacity according to ISO 2471:2008 of at least 50% and at most 90%, particularly preferably at least 55% and at most 85%, and most preferably at least 58% and at most 75%.

[0069] The wrapping paper according to the invention can be used on smoking articles. A further aspect of the invention therefore relates to a smoking article comprising the wrapping material according to the invention. The smoking article according to the invention comprises an aerosol-generating material and a wrapping paper, wherein the wrapping paper at least partially encloses the smoking article and at least partially forms the outermost layer on the smoking article, and wherein at least 70% of the mass of the wrapping paper is formed by cellulose fibers, and wherein the smoothness according to Bekk of the side of the wrapping paper facing outwards on the smoking article is at most 20.0 s, and wherein the elongation at break of the wrapping paper in the machine direction, in the transverse direction and in a 45° direction thereto is at least 2.0% and at most 8.0%.

[0070] Preferably, the smoothness according to Bekk of the outer side of the wrapping paper on the smoking article is at most 15.0 s, particularly preferably at most 10.0 s and most particularly preferably at most 7.0 s.

[0071] Preferably, the Bekk smoothness of the outer side of the wrapping paper on the smoking article is at least 4.0 s and at most 20.0 s, particularly preferably at least 4.0 s and at most 15.0 s, very preferably at least 4.0 s and at most 10.0 s, and especially at least 4.0 s and at most 7.0 s. Preferably, the standard deviation of the Bekk smoothness of the outer side of the wrapping paper on the smoking article is at most 4.0 s, particularly preferably at most 3.0 s, and very preferably at most 2.5 s.

[0072] The other properties relating to the wrapping paper on the smoking product apply in the same way as they are disclosed for the wrapping paper. This relates in particular to the type and quantity of cellulose fibers, the type and quantity of filler, the smoothness, the basis weight, the thickness, the air permeability, the tensile strength, the elongation at break, the whiteness, and the opacity.

[0073] In a preferred embodiment of the smoking article, a pattern is embossed in the wrapping paper; this pattern is particularly preferably a plurality of parallel lines, and the parallel lines are most preferably arranged in the longitudinal direction of the smoking article or in the circumferential direction of the smoking article.

[0074] In a preferred embodiment of the smoking article, the smoking article is a cigarette and the wrapping paper comprises one or more combustion salts, wherein the proportion of combustion salts is at least 0.3% and at most 3%, particularly preferably at least 0.5% and at most 2.5% of the mass of the wrapping paper, and the one or more combustion salts are selected from the group consisting of citrates, malates, tartrates, acetates, nitrates, succinates, fumarates, gluconates, glycolates, lactates, oxylates, salicylates, o-hydroxycaprylates, phosphates, polyphosphates, chlorides and hydrogen carbonates, and mixtures thereof, and most preferably from the group consisting of trisodium citrate, tripotassium citrate and mixtures thereof.

[0075] In a preferred embodiment of the smoking product, the smoking product is a tobacco heater. In this case, the wrapping paper preferably does not contain any flammable salts.

[0076] For heated tobacco products, the strength of the wrapping paper is more important than for cigarettes because some heated tobacco products are inserted into and removed from a heating device, which places additional mechanical stress on the wrapping paper. Therefore, wrapping papers with a higher basis weight are advantageous for such smoking products.

[0077] In a preferred embodiment of the smoking article, the smoking article is a tobacco heater and the wrapping paper has a basis weight according to ISO 536:2019 of at least 40 g / m². 2 and at most 100 g / m² 2 and especially preferably of at least 50 g / m² 2 and at most 100 g / m² 2 With a tobacco heater, the hardness of the tobacco product is also of greater importance because using a tobacco heater requires more manipulation by the consumer. For this reason, a greater thickness of the wrapping paper is advantageous.

[0078] In a preferred embodiment of the smoking article, the smoking article is a tobacco heater and the wrapping paper preferably has a thickness according to ISO 534:2011 of at least 80 pm and at most 200 pm, particularly preferably of at least 100 pm and at most 200 pm.

[0079] With a tobacco heater, the visual appearance of the wrapping paper plays a more significant role because the wrapping paper does not burn and therefore remains visible after use. For this reason, higher opacity and whiteness are advantageous, which can be achieved by using a higher filler content in the wrapping paper.

[0080] In a preferred embodiment of the smoking article, the smoking article is a tobacco heater and at least 5% and at most 35%, particularly preferably at least 10% and at most 30% of the mass of the wrapping paper are formed by filler.

[0081] For tobacco heaters, the wrapping paper can fulfill further functions, such as providing visual effects, preventing staining, indicating use, or providing optimized heat conduction. In a preferred embodiment of the smoking product, the product is a tobacco heater, and the wrapping paper has one or more of the following features: at least one coating; at least one imprint; means of indicating that the tobacco heater has been used; a multilayer structure, in particular a laminate with aluminum foil; or a metallized layer on at least one side of the wrapping paper.

[0082] DESCRIPTION OF THE PREFERRED EXECUTION FORMS AND SOME COMPARATIVE EXAMPLES

[0083] In the following, an exemplary embodiment of the method according to the invention and some preferred embodiments of the wrapping paper are described and compared with examples not according to the invention.

[0084] An example of a device for carrying out the method according to the invention is shown in Fig.

[0085] Figure 1 shows the process. In the headbox 101 of a paper machine 100, a suspension 102 containing cellulose fibers is provided. The suspension 102 flows onto a rotating wire 103 and is dewatered there, forming a paper web 104, the general direction of movement of which is indicated by the arrow 105 and corresponds to the machine direction of the paper web 104. The paper web 104 is removed from the rotating wire 103 and passes through a first pair of rotating rollers 106a, 106b, where the paper web 104 is pressed against a rotating felt 107a to further dewater it. The paper web 104 then passes through a second pair of rotating rollers 108a and 108b, where it is again pressed against a rotating felt 107b.Due to the low tension on the paper web 104 after it leaves the rotating roller 108b, the paper web 104 adheres to the smooth surface of the rotating roller 108a and encounters a crepe scraper 109, which pushes the paper web 104 together. From there, the compressed paper web 104 passes through another pair of rotating rollers 110a, 110b, which can emboss the paper web 104, then through a drying device 111, where it is at least partially dried without contact, and finally to a winding device 112, where the wrapping paper is wound up.

[0086] Several wrapping papers according to the invention were produced using this method. Wrapping papers not according to the invention were produced using the same method, with the difference that, by increasing the tension generated by the rotating rollers 110a, 110b, the paper web 104 did not adhere to the surface of the roller 108a, but ran directly into the gap formed by the rollers 110a, 110b. The process of compressing the paper web was therefore eliminated. As a further example of comparison not according to the invention, a creped paper with the same composition and as similar properties as possible was produced.

[0087] Table 1 lists the data for the wrapping papers according to the invention and those not according to the invention. In Table 1, “ID” means the designation of the wrapping paper, “FIB” the proportion of cellulose fibers (pulp from spruce and pine) based on the mass of the wrapping paper, “FIL” the proportion of filler (precipitated calcium carbonate) based on the mass of the wrapping paper, “BW” the basis weight according to ISO 536:2019, and “TH” the thickness according to ISO 534:2011. The smoothness “SM” according to Bekk according to ISO 5627:1995 / 0311:2002 is specified separately for the side “WS”, i.e., the side of the paper web 104 that was in contact with the rotating screen 103, and for the side “FS”, i.e., the opposite side of the paper web 104, where “AVG” denotes the mean value of 10 measurements on non-overlapping partial areas and “STD” denotes the standard deviation calculated from these 10 values.Wrapping papers A, B, C, and D are wrapping papers according to the invention, while wrapping papers X and Y are not according to the invention, i.e., they were produced without the use of the crepe scraper 109. Paper Z, which is not according to the invention, is a creped paper with otherwise comparable properties. This paper Z is not suitable as wrapping paper for smoking products.

[0088] Table i - Data on wrapping papers according to and not according to the invention

[0089]

[0090] Further data on the wrapping papers A, B, C and D according to the invention are given in Table 2. In this table, “ID” is the designation of the wrapping paper, which corresponds to the designation in Table 1, “TS” is the tensile strength in the machine direction according to ISO 1924-2:2008, “EL-MD” is the elongation at break in the machine direction, “EL-45” 0“The elongation at break in a 45° direction, “EL-CD” the elongation at break in the transverse direction, “AP” the air permeability according to ISO 2965:2019, “BR” the whiteness (ISO Brightness) according to ISO 2470-1:2016 and “OP” the opacity according to ISO 2471:2008. The elongation at break was measured in each of the specified directions according to ISO 1924-2:2008.

[0091] Table 2 - Further data on the wrapping papers according to the invention

[0092]

[0093] It can be seen from the wrapping papers A, B, C, and D according to the invention that a Bekk smoothness of less than 20.0 s can be achieved using the inventive method. With the non-inventive wrapping papers X and Y, care was taken to apply only minimal pressure to the paper web; nevertheless, the Bekk smoothness of these wrapping papers is significantly higher. By adjusting the pressure in the press section or the dryer section, it is also possible to increase the smoothness of the wrapping papers according to the invention, so that a Bekk smoothness of 20.0 s or higher can be achieved. A Bekk smoothness of at most 20.0 s can therefore be readily achieved with the inventive method, whereas this is not possible with a conventional paper machine manufacturing process.

[0094] The smoothness according to Bekk of both sides of the wrapping papers according to the invention is very similar and differs by less than 2.0 s, which represents a further advantage of the method. A comparison of wrapping papers A and B with C and D suggests that filler tends to lead to a smoother surface.

[0095] The wrapping papers A, B, C and D according to the invention had a striking haptic quality due to their rough surface, which, according to the inventors' findings, could not previously be produced in this way for wrapping papers for smoking articles.

[0096] The wrapping paper A according to the invention was additionally embossed with parallel lines (verge lines) on the paper machine in the press area, so that the parallel lines lie circumferentially on a smoking article. In addition to the tactile impression of these lines, which is usually not present in conventional wrapping papers, the lines were also visually more clearly visible than in conventional wrapping papers.

[0097] The elongation at break of the non-inventive, creped paper Z was determined in the machine direction and was approximately 22%, as is typical for creped papers. This is significantly higher than the elongation at break of the inventive wrapping papers A, B, C, and D in each of the three directions. This clearly indicates that the collapsible paper structure in the inventive wrapping papers A, B, C, and D is strengthened by the inventive method, such that, unlike the creped paper Z, it cannot be destroyed again by slight tension.

[0098] The data from Table 2 show that the wrapping papers according to the invention have properties that make them well suited for use as wrapping paper on smoking products. In particular, the smoking products discussed above can be easily manufactured using the wrapping paper according to the invention in a manner known from the prior art. This applies to both cigarettes and tobacco heaters for use with or without heating devices, in which the wrapping papers according to the invention can be used.

Claims

1. delfortgroup AG D31951WO Claims 1. Method for manufacturing a wrapping paper for a smoking article, comprising the following steps: A - Providing an aqueous suspension comprising cellulose fibers, wherein at least 70% of the mass of the solids in the suspension are formed by cellulose fibers, B - Dewatering the suspension on a circulating screen to form a paper web, C - Pressing the paper web between at least one pair of rotating rollers against a circulating felt, so that the water content of the paper web is at least 40% and at most 80%, D - Pushing the paper web together using a crepe scraper, E - Pressing the paper web between at least one pair of rotating rollers against a circulating felt, F - Drying the paper web to obtain wrapping paper for smoking products, G - Rolling up the wrapping paper for smoking products, wherein the water content of the paper web at the beginning of step D is at least 40% and wherein the wrapping paper for smoking articles has a smoothness according to Bekk of at most 20.0 s on at least one side after step G.

2. The method of claim 1, wherein the paper web is not artificially dried between step C and step D.

3. The method according to claim 1 or 2, wherein at least 80%, preferably at least 90% and particularly preferably at least 95% of the mass of the solids in the aqueous suspension of step A are formed by cellulose fibers.

4. A method according to any of the preceding claims, wherein the cellulose fibers are obtained from coniferous trees, in particular spruce, pine or fir, from deciduous trees, in particular birch, beech or eucalyptus, or from hemp, flax, jute, ramie, kenaf, kapok, coconut, abaca, sisal, bamboo, cotton or esparto grass, or are a mixture of cellulose fibers obtained from two or more of these trees or plants.

5. A method according to any of the preceding claims, wherein the aqueous suspension in step A comprises filler, wherein the filler constitutes at least 1% and at most 30%, preferably at most 20% and particularly preferably at most 10% of the mass of the solids in the suspension of step A.

6. The method of claim 5, wherein the filler is selected from the group consisting of calcium carbonate, magnesium carbonate, titanium dioxide, magnesium oxide, magnesium hydroxide, aluminum hydroxide, magnesium silicate, aluminum silicate, kaolin, talc, and bentonite, or is formed by a mixture of two or more of these filler types.

7. Method according to one of the preceding claims, wherein the pressing of the paper web against a circulating felt in step C is carried out such that the paper web passes through exactly two pairs of rotating rollers and is pressed against a felt between the rollers.

8. Method according to one of the preceding claims, wherein the pressing of the paper web in step C is carried out such that the water content of the paper web after pressing in step C is at least 45% and at most 75%, preferably at least 50% and at most 70%.

9. Method according to any of the preceding claims, wherein the water content of the paper web at the beginning of step D is at least 40% and at most 80%, preferably at least 45% and at most 75% and particularly preferably at least 50% and at most 70%.

10. Method according to any of the preceding claims, wherein the drying in step F is carried out at least partially, preferably exclusively, by hot air, by infrared radiation and / or by microwave radiation.

11. Method according to one of the preceding claims, wherein the method between steps E and F comprises a further step of embossing the paper web from step E.

12. The method of claim 11, wherein a pattern embossed into the paper web in the said embossing step comprises lines, logos and / or lettering.

13. A method according to any one of the preceding claims, wherein the smoothness according to Bekk of the wrapping paper after step G is at most 15.0 s, preferably at most 10.0 s and particularly preferably at most 7.0 s.

14. A method according to any one of the preceding claims, wherein the smoothness according to Bekk of the wrapping paper after step G is at least 4.0 s on at least one side.

15. Method according to one of the preceding claims, wherein the smoothness according to Bekk of both sides of the wrapping paper is at most 20.0 s, preferably at most 15.0 s, particularly preferably at most 10.0 s and particularly at most 7.0 s.

16. Method according to one of the preceding claims, wherein the smoothness according to Bekk of both sides of the wrapping paper after step G is at least 4.0 s.

17. Method according to one of the preceding claims, wherein in the wrapping paper according to step G the smoothness according to Bekk of one side of the wrapping paper differs from the smoothness according to Bekk of the other side of the wrapping paper by no more than 4.0 s, preferably by no more than 3.0 s, particularly preferably by no more than 2.0 s and in particular by no more than 1.0 s.

18. Method according to one of the preceding claims, wherein the standard deviation of the Bekk smoothness of at least one side of the wrapping paper after step G is at most 4.0 s, preferably at most 3.0 s and particularly preferably at most 2.5 s, wherein the standard deviation of the Bekk smoothness of one side of the wrapping paper is to be determined by 10 measurements of the Bekk smoothness on non-overlapping test areas of that side of the wrapping paper.

19. Method according to one of the preceding claims, wherein the standard deviation of the Bekk smoothness of both sides of the wrapping paper after step G is at most 4.0 s, preferably at most 3.0 s and particularly preferably at most 2.5 s, wherein the standard deviation of the Bekk smoothness of the respective side of the wrapping paper is to be determined by 10 measurements of the Bekk smoothness on non-overlapping test areas of that side of the wrapping paper.

20. Method according to any of the preceding claims, wherein the wrapping paper after step G has a basis weight according to ISO 536:2019 of at least 20 g / m² 2 and at most 100 g / m² 2 , preferably of at least 25 g / m² 2 and at most 80 g / m² 2 and especially preferably of at least 30 g / m² 2 and at most 70 g / m² 2 exhibits.

21. Method according to any of the preceding claims, wherein the wrapping paper after step G has a thickness according to ISO 534:2011 of at least 40 pm and at most 200 mm, preferably of at least 60 pm and at most 150 pm and particularly preferably of at least 80 pm and at most 120 pm.

22. Method according to one of the preceding claims, wherein the wrapping paper after step G has an air permeability according to ISO 2965:2019 measured at a pressure difference of 1 kPa of at least 10 cm. 3 / (min-cm 2 ) and at most 150 cm 3 / (min-cm 2 ), preferably of at least 20 cm 3 / (min-cm 2 ) and at most 100 cm 3 / (min-cm 2 ), particularly preferably of at least 40 cm 3 / (min-cm 2 ) and at most 90 cm 3 / (min-cm 2 ) and especially preferably at least 50 cm 3 / (min-cm 2 ) and at most 80 cm 3 / (min-cm2 ) exhibits.

23. Method according to any of the preceding claims, wherein the wrapping paper after step G has a tensile strength according to ISO 1924-2:2008 of at least 10 N / 15 mm and at most 80 N / 15 mm, preferably of at least 15 N / 15 mm and at most 70 N / 15 mm and particularly preferably of at least 20 N / 15 mm and at most 50 N / 15 mm.

24. Method according to one of the preceding claims, wherein the elongation at break of the wrapping paper after step G in the machine direction, in the transverse direction and in a 45° direction thereto is at least 2.0% and at most 8.0%, preferably at least 3.0% and at most 7.0% and particularly preferably at least 4.0% and at most 6.0%.

25. Method according to any of the preceding claims, wherein the wrapping paper after step G has on at least one side a whiteness according to ISO 2470-1:2016 of at least 80% and at most 105%, preferably of at least 82% and at most 100% and particularly preferably of at least 83% and at most 90%.

26. Method according to any of the preceding claims, wherein the wrapping paper after step G has an opacity according to ISO 2471:2008 of at least 50% and at most 90%, preferably of at least 55% and at most 85% and particularly preferably of at least 58% and at most 75%.

27. Wrapping paper for smoking articles, wherein at least 70% of the mass of the wrapping paper is formed by cellulose fibers, wherein the smoothness according to Bekk on at least one side of the wrapping paper is at most 20.0 s and wherein the elongation at break of the wrapping paper in the machine direction, in the transverse direction and in a 45° direction thereto is at least 2.0% and at most 8.0%.

28. Wrapping paper according to claim 27, wherein at least 80%, preferably at least 90% and particularly preferably at least 95% of the mass of the wrapping paper is formed by cellulose fibers.

29. Wrapping paper according to claim 27 or 28, wherein the cellulose fibers are obtained from coniferous trees, in particular spruce, pine or fir, from deciduous trees, in particular birch, beech or eucalyptus, or from hemp, flax, jute, ramie, kenaf, kapok, coconut, abaca, sisal, bamboo, cotton or esparto grass, or are a mixture of cellulose fibers obtained from two or more of these trees or plants.

30. Wrapping paper according to any one of claims 27 to 29, wherein the wrapping paper comprises filler, wherein the filler constitutes at least 1% and at most 30%, preferably at most 20% and particularly preferably at most 10% of the mass of the wrapping paper.

31. Wrapping paper according to claim 30, wherein the filler is selected from the group consisting of calcium carbonate, magnesium carbonate, titanium dioxide, magnesium oxide, magnesium hydroxide, aluminum hydroxide, magnesium silicate, aluminum silicate, kaolin, talc, and bentonite, or is formed by a mixture of two or more of these filler types.

32. Wrapping paper according to one of claims 27 to 31, wherein the smoothness according to Bekk of the wrapping paper on at least one side is at most 15.0 s, preferably at most 10.0 s and particularly preferably at most 7.0 s.

33. Wrapping paper according to one of claims 27 to 32, wherein the smoothness according to Bekk of the wrapping paper is at least 4.0 s on at least one side.

34. Wrapping paper according to one of claims 27 to 33, wherein the smoothness according to Bekk of both sides of the wrapping paper is at most 20.0 s, preferably at most 15.0 s, particularly preferably at most 10.0 s and particularly at most 7.0 s.

35. Wrapping paper according to any one of claims 27 to 34, wherein the Bekk smoothness of both sides of the wrapping paper is at least 4.0 s.

36. Wrapping paper according to any one of claims 27 to 35, wherein the Bekk smoothness of one side of the wrapping paper differs from the Bekk smoothness of the other side of the wrapping paper by no more than 4.0 s, preferably by no more than 3.0 s, particularly preferably by no more than 2.0 s and particularly by no more than 1.0 s.

37. Wrapping paper according to one of claims 27 to 36, wherein the standard deviation of the Bekk smoothness of at least one side of the wrapping paper is at most 4.0 s, preferably at most 3.0 s and particularly preferably at most 2.5 s, wherein the standard deviation of the Bekk smoothness of one side of the wrapping paper is to be determined by 10 measurements of the Bekk smoothness on non-overlapping test areas of that side of the wrapping paper.

38. Wrapping paper according to one of claims 27 to 37, wherein the standard deviation of the Bekk smoothness from both sides of the wrapping paper is at most 4.0 s, preferably at most 3.0 s and particularly preferably at most 2.5 s, wherein the standard deviation of the Bekk smoothness of the respective side of the wrapping paper is to be determined by 10 measurements of the Bekk smoothness on non-overlapping test areas of that side of the wrapping paper.

39. Wrapping paper according to one of claims 27 to 38, the elongation at break of which in the machine direction, in the transverse direction and in a 45° direction thereto is at least 3.0% and at most 7.0%, preferably at least 4.0% and at most 6.0%.

40. Wrapping paper according to any one of claims 27 to 39, wherein the wrapping paper has a basis weight according to ISO 536:2019 of at least 20 g / m² 2 and at most 100 g / m² 2 , preferably of at least 25 g / m² 2 and at most 80 g / m² 2 and especially preferably of at least 30 g / m² 2 and at most 70 g / m² 2 exhibits.

41. Wrapping paper according to any one of claims 27 to 40, wherein the wrapping paper has a thickness according to ISO 534:2011 of at least 40 pm and at most 200 pm, preferably at least 60 pm and at most 150 pm and particularly preferably at least 80 pm and at most 120 pm.

42. Wrapping paper according to any one of claims 27 to 41, wherein the wrapping paper has an air permeability according to ISO 2965:2019 measured at a pressure difference of 1 kPa of at least 10 cm. 3 / (min-cm 2 ) and at most 150 cm 3 / (min-cm 2 ), preferably of at least 20 cm 3 / (min-cm 2 ) and at most 100 cm 3 / (min-cm 2 ), especially preferred at least 40 cm 3 / (min-cm 2 ) and at most 90 cm 3 / (min-cm 2 ) and especially preferably at least 50 cm 3 / (min-cm 2 ) and at most 80 cm 3 / (min-cm 2 ) exhibits.

43. Wrapping paper according to any one of claims 27 to 42, wherein the wrapping paper has a tensile strength according to ISO 1924-2:2008 of at least 10 N / 15 mm and at most 80 N / 15 mm, preferably of at least 15 N / 15 mm and at most 70 N / 15 mm and particularly preferably of at least 20 N / 15 mm and at most 50 N / 15 mm.

44. Wrapping paper according to any one of claims 27 to 43, wherein the wrapping paper has on at least one side a whiteness according to ISO 2470-1:2016 of at least 80% and at most 105%, preferably at least 82% and at most 100% and particularly preferably at least 83% and at most 90%.

45. Wrapping paper according to any one of claims 27 to 44, wherein the wrapping paper has an opacity according to ISO 2471:2008 of at least 50% and at most 90%, preferably at least 55% and at most 85% and particularly preferably at least 58% and at most 75%.

46. ​​Wrapping paper according to any one of claims 27 to 45, obtainable by production in a process according to any one of claims 1 to 26.

47. Smoking article comprising an aerosol-generating material and a wrapping paper, wherein the wrapping paper at least partially encloses the smoking article and at least partially forms the outermost layer on the smoking article, wherein at least 70% of the mass of the wrapping paper is formed by cellulose fibers, wherein the smoothness according to Bekk of the side of the wrapping paper facing outwards on the smoking article is at most 20.0 s and wherein the elongation at break of the wrapping paper in the machine direction, in the transverse direction and in a 45° direction thereto is at least 2.0% and at most 8.0%.

48. Smoking article according to claim 47, wherein the smoothness according to Bekk of the outer side of the wrapping paper on the smoking article is at most 15.0 s, preferably at most 10.0 s and particularly preferably at most 7.0 s.

49. Smoking article according to claim 48, wherein the smoothness according to Bekk of the outer side of the wrapping paper on the smoking article is at least 4.0 s and at most 20.0 s, preferably at least 4.0 s and at most 15.0 s, particularly preferably at least 4.0 s and at most 10.0 s and particularly at least 4.0 s and at most 7.0 s.

50. Smoking article according to one of claims 47 to 49, wherein the standard deviation of the Bekk smoothness of the outer side of the wrapping paper on the smoking article is at most 4.0 s, preferably at most 3.0 s and particularly preferably at most 2.5 s, wherein the standard deviation of the Bekk smoothness of this side of the wrapping paper is to be determined by 10 measurements of the Bekk smoothness on non-overlapping test areas of this side of the wrapping paper.

51. Smoking article according to any one of claims 47 to 50, wherein the wrapping paper is a wrapping paper according to any one of claims 27 to 46.

52. Smoking article according to one of claims 47 to 51, wherein a pattern is embossed in the wrapping paper, wherein this pattern is preferably formed by a plurality of parallel lines, which are preferably arranged in the longitudinal direction of the smoking article or in the circumferential direction of the smoking article.

53. Smoking article according to any one of claims 47 to 52, wherein the smoking article is a cigarette and the wrapping paper comprises one or more combustion salts, wherein the proportion of combustion salts is at least 0.3% and at most 3%, preferably at least 0.5% and at most 2.5% of the mass of the wrapping paper, and the one or more combustion salts are selected from the group consisting of citrates, malates, tartrates, acetates, nitrates, succinates, fumarates, gluconates, glycolates, lactates, oxylates, salicylates, α-hydroxycaprylates, phosphates, polyphosphates, chlorides and hydrogen carbonates, and mixtures thereof, and most preferably from the group consisting of trisodium citrate, tripotassium citrate and mixtures thereof.

54. Smoking article according to any one of claims 47 to 52, wherein the smoking article is a tobacco heater, wherein the aerosol-forming material is heated but not burned during intended use.

55. Smoking article according to claim 54, wherein the wrapping paper has a basis weight according to ISO 536:2019 of at least 40 g / m² 2 and at most 100 g / m² 2 , preferably of at least 50 g / m² 2 and at most 100 g / m² 2 exhibits.

56. Smoking article according to claim 54 or 55, wherein the wrapping paper has a thickness according to ISO 534:2011 of at least 80 pm and at most 200 pm, preferably of at least 100 pm and at most 200 pm.

57. Smoking article according to one of claims 54 to 56, wherein at least 5% and at most 35%, preferably at least 10% and at most 30% of the mass of the wrapping paper is formed by filler.

58. Smoking article according to any one of claims 54 to 57, wherein the wrapping paper has one or more of the following features: at least one coating; at least one imprint; means of indicating that the tobacco heater has been used; a multilayer structure, in particular a laminate with aluminium foil; or a metallized layer on at least one side of the wrapping paper.

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