Tobacco Sheet

Abstract

This tobacco sheet includes: a tobacco material; and a cellulose derivative having a degree of substitution of 0.65 or higher.

Description

[Technical field]

[0001] The present invention relates to a tobacco sheet. [Background technology]

[0002] Many techniques have been proposed relating to non-combustion smoking articles in which flavor components produced by heating a tobacco sheet are inhaled (for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 5292410 Summary of the Invention [Problem to be solved by the invention]

[0004] Conventional tobacco sheets generate fine powder, known as "spilled tobacco powder," during or after use, which causes problems in handling, such as adhesion to clothing, etc. In view of the above circumstances, an object of the present invention is to provide a tobacco sheet with reduced spilled tobacco powder. [Means for solving the problem]

[0005] The inventors have found that the above problems can be solved by using a specific binder. That is, the above problems are solved by the present invention described below. (1) a tobacco material; A cellulose derivative having a degree of substitution of 0.65 or more. Tobacco sheets. (2) The sheet according to (1), wherein the degree of substitution is 0.7 or more. (3) The sheet according to (2), wherein the degree of substitution is 0.8 or more. (4) The sheet according to any one of (1) to (3), wherein the cellulose derivative is a carboxyalkylated cellulose. (5) The sheet according to any one of (1) to (4), having an arithmetic mean surface roughness Sa of 0.03 mm or less. (6) The sheet according to any one of (1) to (5), which is a pressure-molded sheet. (7) Step 1 of preparing a mixture containing at least a tobacco material, the cellulose derivative, and a medium; Step 2 of spreading the mixture on a substrate to prepare a wet wipe; and Step 3: drying the wet wipes; The method for producing a sheet according to any one of (1) to (6), comprising: (8) The manufacturing method according to (7), wherein the step 1 includes kneading a tobacco material, the cellulose derivative, and a medium in a single-screw or multi-screw kneader. (9) The method according to (7) or (8), wherein step 2 includes compressing the mixture using a roller or extruding the mixture through a die. (10) The manufacturing method according to (9), wherein the step 2 includes preparing a laminate sheet in which a wet sheet is present between two base films. (11) A non-combustion heating smoking article comprising the tobacco sheet or a material derived therefrom according to any one of (1) to (6) above. Effect of the Invention

[0006] According to the present invention, a tobacco sheet with reduced chipping can be provided. [Brief description of the drawings]

[0007] [Figure 1] Schematic diagram showing an example of a tobacco segment using a tobacco sheet [Diagram 2] A schematic cross-sectional view showing an example of a non-combustion heating type smoking system. [Diagram 3] Schematic cross-sectional view showing an example of a non-combustion heating type flavor inhalation article. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] The present invention will be described in detail below. In the present invention, "X to Y" includes the extreme values ​​X and Y. 1. Tobacco sheets A tobacco sheet is a sheet used in smoking articles, and contains tobacco material and a cellulose derivative having a degree of substitution of 0.65 or more as a binder.

[0009] (1) Binder A binder is an adhesive for binding tobacco materials together or between tobacco materials and other components. In the present invention, a cellulose derivative with a degree of substitution of 0.65 or more is used as the binder. A cellulose derivative is cellulose in which the -OH groups of the gluconopyranose residues have been modified. Those in which the -OH groups have been modified to -OR groups (R is an organic group) are also called cellulose ethers, those in which the -OH groups have been modified to -OX groups (X is a group derived from an acid) are also called cellulose esters, and those in which at least one of the -OH groups of the gluconopyranose residues is an -OR group and at least one is an -OX group are also called cellulose ether esters. Any of these can be used in the present invention.

[0010] The degree of substitution is the number of substituents per gluconopyranose residue, i.e., the number of modified OH groups. The degree of substitution used in the present invention is preferably 0.65 or more, more preferably 0.7 or more, and even more preferably 0.8 or more. The upper limit of the degree of substitution is preferably 3.0 or less, more preferably 2.0 or less, even more preferably 1.6 or less, and particularly preferably 1.0 or less.

[0011] The degree of substitution is measured by a known method. For example, the degree of substitution is measured by the nitric acid methanol method. The method is as follows: 1) Approximately 2.0 g of the sample is weighed out and placed in a 300 ml stoppered Erlenmeyer flask. 100 ml of nitric acid methanol (a solution of 1 g of anhydrous methanol and 100 ml of special-grade concentrated nitric acid) is added, and the mixture is shaken for about 2 hours to convert the terminal acid group from a salt type to a hydrogen type (for example, from COONa to COOH). 2) The sample is filtered through a glass filter 1G3, washed with 200 ml of 80% methanol, and then dried at 105°C for 2 hours. 3) Approximately 1 to 1.5 g of the bone-dried sample is weighed out and placed in a 300 ml stoppered Erlenmeyer flask, moistened with 150 ml of 80% methanol, 50 ml of 0.1 N NaOH is added, and the mixture is shaken at room temperature for 2 hours. Phenolphthalein is used as an indicator, and excess NaOH is back-titrated with 0.1 N sulfuric acid. 4) The degree of substitution is calculated from the following formula. Substitution degree=0.162A / (1-0.058A) A = 50 x F' - amount of sulfuric acid (ml) x F / weight of bone dry sample (g) x 0.1 F: factor of the sulfuric acid F': The factor of NaOH

[0012] In cellulose ethers, there are a maximum of three Rs, and each R may be the same or different. Examples of R include linear or branched alkyl groups having C1 to C3, such as methyl, ethyl, and propyl groups; linear or branched hydroxyalkyl groups having C1 to C3, such as hydroxymethyl, hydroxyethyl, and hydroxypropyl groups; arylalkyl groups having carbon numbers of C7 to C20, such as benzyl and trityl groups; cyanoalkyl groups, such as cyanoethyl groups; carboxyalkyl groups, such as carboxymethyl and carboxyethyl groups; and aminoalkyl groups, such as aminoethyl groups. Among these, carboxyalkyl groups are preferred as R, and carboxymethyl groups are more preferred. The degree of substitution in cellulose ethers is also called the degree of etherification.

[0013] In cellulose esters, there are a maximum of three X's, and each X may be the same or different. Examples of X's include groups derived from C0-C4 carboxylic acids such as formic acid, acetic acid, propionic acid, and butyric acid; groups derived from C6-C10 aromatic carboxylic acids such as benzoic acid and phthalic acid; groups derived from sulfonic acids such as p-toluenesulfonic acid; groups derived from inorganic acids such as nitric acid, sulfuric acid, and phosphoric acid; and groups derived from xantogenic acid. The degree of substitution in cellulose esters is also called the degree of esterification.

[0014] The cellulose derivatives are highly hydrophilic, and therefore have improved affinity with tobacco materials when used as a binder, resulting in improved strength of the tobacco sheet and reduced peeling during use.

[0015] Furthermore, the cellulose derivative is soluble in organic solvents, particularly ethanol. Therefore, as described below, when a mixture using ethanol as a medium is used in the production of tobacco sheets, the viscosity of the mixture can be reduced, which is more advantageous in the transportation and coating steps during production than a mixture using water as a medium. Furthermore, since ethanol is more volatile than water, it is possible to shorten the production time and reduce the energy cost during drying in the production method.

[0016] The amount of the cellulose derivative in the tobacco sheet is not particularly limited, but is preferably 0.1 to 10% by weight, more preferably 1 to 5% by weight, and even more preferably 2 to 4% by weight, based on the dry weight of the tobacco sheet (weight excluding water contained therein, the same applies below). If the amount of the binder exceeds the upper limit or is below the lower limit, the above-mentioned effect may not be fully exerted.

[0017] Specific examples of the cellulose derivatives are given below. Cellulose ethers: methyl cellulose, ethyl cellulose, hydroxyethyl cellulose, hydroxymethylethyl cellulose, hydroxypropyl cellulose, hydroxypropylmethyl cellulose, benzyl cellulose, trityl cellulose, cyanoethyl cellulose, carboxymethyl cellulose, carboxyethyl cellulose, aminoethyl cellulose Cellulose esters: organic acid esters such as cellulose acetate, cellulose formate, cellulose propionate, cellulose butyrate, cellulose benzoate, cellulose phthalate, tosyl cellulose, and cellulose nitrate; inorganic acid esters such as cellulose sulfate, cellulose phosphate, and cellulose xanthogenate.

[0018] (2) Tobacco materials The tobacco material is a material derived from tobacco, and specifically includes dried tobacco leaves that have been chopped, or leaf tobacco pulverized material. Leaf tobacco pulverized material is particles obtained by pulverizing leaf tobacco. The leaf tobacco pulverized material can have a particle size D90 of, for example, 20 to 1000 μm, preferably 50 to 500 μm. The pulverization can be performed using a known pulverizer, and may be either dry pulverization or wet pulverization. Therefore, leaf tobacco pulverized material is also called leaf tobacco particles. In the present invention, the average particle size is determined by a laser diffraction / scattering method, and specifically, is measured using a laser diffraction type particle size distribution measuring device (for example, HORIBA LA-950). In addition, the type of tobacco is not limited, and flue-cured, Burley, Orient, native, and other Nicotiana tabacum and Nicotiana rustica varieties can be used. The amount of tobacco material in the tobacco sheet is not particularly limited, but is preferably 50 to 95% by weight, more preferably 60 to 90% by weight, in terms of dry weight.

[0019] (3) Aerosol-generating substrate The tobacco sheet may contain an aerosol-generating substrate. The aerosol-generating substrate is a material that vaporizes when heated and cools to generate an aerosol, or generates an aerosol by atomization. Any known aerosol-generating substrate may be used, and examples thereof include polyhydric alcohols such as glycerin and propylene glycol (PG), triethyl citrate (TEC), triacetin, and the like, each of which has a boiling point of more than 100°C. The amount of the aerosol-generating substrate in the tobacco sheet is preferably 1 to 40% by weight, more preferably 10 to 20% by weight, in terms of dry weight (weight excluding water contained therein, the same applies below). If the amount of the aerosol-generating substrate exceeds the upper limit, it may be difficult to manufacture the tobacco sheet, and if it is less than the lower limit, the smoke sensation may be reduced.

[0020] (4) Emulsifier The tobacco sheet may contain an emulsifier. The emulsifier enhances the affinity between the lipophilic aerosol-generating substrate and the hydrophilic tobacco material. Thus, the addition of an emulsifier is effective, particularly when a lipophilic aerosol-generating substrate is used. Any known emulsifier can be used, and examples of such emulsifiers include emulsifiers having an HLB value of 8 to 18. The amount of emulsifier is not particularly limited, but is preferably 0.1 to 3 parts by weight, more preferably 1 to 2 parts by weight, on a dry weight basis, relative to 100 parts by weight of the tobacco sheet.

[0021] (5) Cellulose other than tobacco The tobacco sheet may contain cellulose other than tobacco. Examples of cellulose other than tobacco include cellulose fiber and cellulose powder, and do not include cellulose derivatives as binders. A tobacco sheet containing cellulose fiber has high strength. Examples of such fibers include pulp fiber. Pulp fiber is an aggregate of cellulose fibers extracted from plants such as wood, and is usually used as a raw material for paper. Examples of pulp fiber include waste paper pulp, chemical pulp, and mechanical pulp.

[0022] From the viewpoint of mechanical strength, etc., the amount of the fibers in the tobacco sheet is preferably 1 to 20% by weight, more preferably 5 to 10% by weight, in terms of dry weight. However, since unpleasant flavors can be reduced if the tobacco sheet does not contain the fibers, in one embodiment, the tobacco sheet does not contain the fibers. In this case, the strength can be increased by adjusting the amount of binder.

[0023] (6)Fragrance The tobacco sheet may contain a flavoring. A flavoring is a substance that provides an aroma or flavor. The flavoring may be a natural flavoring or a synthetic flavoring. A single type of flavoring may be used as the flavoring, or a mixture of multiple types of flavorings may be used. Any flavoring that is generally used in smoking articles may be used as the flavoring, and specific examples will be described later. The flavoring may be contained in the sheet for smoking articles in an amount that allows the smoking article to provide a preferred aroma or flavor, and for example, the amount is preferably 1 to 30% by weight, more preferably 2 to 20% by weight, in the tobacco sheet.

[0024] The type of the fragrance is not particularly limited, and from the viewpoint of imparting a good fragrance sensation, the following may be used: acetanisole, acetophenone, acetylpyrazine, 2-acetylthiazole, alfalfa extract, amyl alcohol, amyl butyrate, trans-anethole, star anise oil, apple juice, balsam of Peru oil, beeswax absolute, benzaldehyde, benzoin resinoid, benzyl alcohol, benzyl benzoate, benzyl phenylacetate, benzyl propionate, 2,3-butanedione, 2-butanol, butyl butyrate, butyric acid, caramel, cardamom oil, carob absolute, β-carotene, carrot juice, L-carvone, β-caryophyllene, cassia bark oil, cedarwood oil, celery seed oil, chamomile oil, cinnamaldehyde, cinnamic acid, cinnamyl alcohol, cinnamyl cinnamate, citronella oil, DL-citronella, citronella oleracea ... lonerol, clary sage extract, cocoa, coffee, konjac oil, coriander oil, cumin aldehyde, davana oil, delta-decalactone, gamma-decalactone, decanoic acid, dill herb oil, 3,4-dimethyl-1,2-cyclopentanedione, 4,5-dimethyl-3-hydroxy-2,5-dihydrofuran-2-one, 3,7-dimethyl-6-octenoic acid, 2,3-dimethylpyrazine, 2,5-dimethylpyrazine, 2,6-dimethylpyrazine, ethyl 2-methylbutyrate, ethyl acetate, ethyl butyrate, ethyl hexanoate, ethyl isovalerate, ethyl lactate, ethyl laurate, ethyl levulinate, ethyl maltol, ethyl octanoate, ethyl oleate, ethyl palmitate, ethyl phenylacetate, ethyl propionate, ethyl stearate, ethyl valerate, ethyl vanillin, ethyl vanillin glucoside, 2-ethyl-3,(5 or 6)-Dimethylpyrazine, 5-ethyl-3-hydroxy-4-methyl-2(5H)-furanone, 2-ethyl-3-methylpyrazine, eucalyptol, fenugreek absolute, gene absolute, gentian root infusion, geraniol, geranyl acetate, grape juice, guaiacol, guava extract, gamma-heptalactone, gamma-hexalactone, hexanoic acid, cis-3-hexen-1-ol, hexyl acetate, hexyl alcohol, phenylhexyl acetate, honey, 4-hydroxy-3-pentenoic acid, la , 4-Hydroxy-4-(3-hydroxy-1-butenyl)-3,5,5-trimethyl-2-cyclohexen-1-one, 4-(para-hydroxyphenyl)-2-butanone, Sodium 4-Hydroxyundecanoate, Immortelle Absolute, β-Ionone, Isoamyl Acetate, Isoamyl Butyrate, Isoamyl Phenylacetate, Isobutyl Acetate, Isobutyl Phenylacetate, Jasmine Absolute, Cola Nut Tincture, Labdanum Oil, Lemon Terpeneless Oil, Licorice Extract, Linalool, Linalyl Acetate, Robe Dioscorea officinalis root oil, maltol, maple syrup, menthol, menthone, L-menthyl acetate, paramethoxybenzaldehyde, methyl 2-pyrrolyl ketone, methyl anthranilate, methyl phenylacetate, methyl salicylate, 4'-methylacetophenone, methylcyclopentenolone, 3-methylvaleric acid, mimosa absolute, tsammi fruit, myristic acid, nerol, nerolidol, gamma-nonalactone, nutmeg oil, delta-octalactone, octanal, octanoic acid, orange flower oil, orange oil, orris root oil, palmitic acid, omega-pentadecane Calactone, Peppermint Oil, Petitgrain Paraguay Oil, Phenethyl Alcohol, Phenethyl Phenylacetate, Phenylacetic Acid, Piperonal, Plum Extract, Propylguaethol, Propyl Acetate, 3-Propylidenephthalide, Prune Juice, Pyruvic Acid, Raisin Extract, Rose Oil, Rum, Sage Oil, Sandalwood Oil, Spearmint Oil, Styrax Absolute, Marigold Oil, Tea Distillate, Alpha-Terpineol, Terpinyl Acetate, 5,6,7,8-Tetrahydroquinoxaline, 1,5,5,9-Tetramethyl-13-oxacyclo(8.3.0.0(4.9))tridecane, 2,3,5,6-tetramethylpyrazine, thyme oil, tomato extract, 2-tridecanone, triethyl citrate, 4-(2,6,6-trimethyl-1-cyclohexenyl)2-buten-4-one, 2,6,6-trimethyl-2-cyclohexene-1,4-dione, 4-(2,6,6-trimethyl-1,3-cyclohexadienyl)2-buten-4-one, 2,3,5-trimethylpyrazine, gamma-undecalactone, gamma-valerolactone, vanilla extract, vanillin, veratraldehyde, violet leaf absolute, N-ethyl-p -menthane-3-carboxamide (WS-3), ethyl-2-(p-menthane-3-carboxamide) acetate (WS-5), sugar (sucrose, fructose, etc.), cocoa powder, carob powder, coriander powder, licorice powder, orange peel powder, rose pip powder, chamomile flower powder, lemon verbena powder, peppermint powder, leaf powder, spearmint powder, black tea powder, natural plant flavors (e.g., jasmine oil, lemon oil, vetiver oil, lovage oil), esters (e.g., menthyl acetate, isoamyl propionate, etc.), alcohols (e.g., phenylethyl alcohol, cis-6-nonen-1-ol, etc.). These flavors may be used alone or in combination of two or more.

[0025] (7) Characteristics and form of tobacco sheets 1) Thickness The thickness of the tobacco sheet is not limited, but in one aspect it is preferably 20 to 2000 μm, more preferably 100 to 1500 μm, and even more preferably 100 to 1000 μm.

[0026] 2) Strength The tobacco sheet preferably has a tensile stress of 1.7 N / mm or more, more preferably 2 N / mm or more, and even more preferably 3 N / mm or more.

[0027] 3) Arithmetic mean surface roughness Sa The tobacco sheet preferably has an arithmetic mean surface roughness Sa of 0.03 mm or less. Sa is an index of surface roughness, and when the tobacco sheet of the present invention has Sa in the above range, chipping from the surface is reduced. From this viewpoint, the upper limit of Sa is more preferably 0.02 mm or less. Sa is measured by a known method, but is preferably measured using a microscope (e.g., VK-X100 manufactured by KEYENCE) according to the following procedure. 1) Set the focal position at the lowest part of the sheet 2) Set the focal position on the highest part of the sheet 3) Divide the sections obtained in 1) and 2) above, and take images while shifting the focus little by little. 4) Measure the height from the difference between the focal position of each part and the focal position of the lowest part. 5) Calculate the roughness from the height data at each position (automatically calculate using the measuring instrument software if necessary) and calculate the arithmetic surface roughness Sa.

[0028] (8) Tobacco segment From the tobacco sheet, a tobacco segment for use in a smoking article can be manufactured. In one embodiment, the tobacco segment comprises a cylindrical wrapper, and a tobacco sheet is spirally packed in the wrapper (see FIG. 1(A)). In the figure, 20A is the tobacco segment, 1 is the tobacco sheet, and 22 is the wrapper, which is usually paper. The tobacco segment is preferably rod-shaped, and its length can be about 15 to 80 mm, and its diameter can be about 5 to 10 mm. Furthermore, the tobacco segment 20A shown in FIG. 1(A) can be cut to have an aspect ratio (length / diameter) of about 0.5 to 1.2 (see FIG. 1(B)).

[0029] In another embodiment, the tobacco segment 20A comprises a cylindrical wrapper 22, and a tobacco sheet 1 that is folded and packed inside the wrapper. The ridges generated by the folding are approximately parallel to the longitudinal direction of the segment (see FIG. 1(C)). The tobacco segment 20A is preferably rod-shaped, and may have a length of about 15 to 80 mm and a diameter of about 5 to 10 mm. In this embodiment, it is preferable that the tobacco sheet 1 has been previously subjected to a surface wrinkling process such as pleating or crimping.

[0030] In another embodiment, the tobacco segment 20A includes a cylindrical wrapper 22, and a cut piece 1c of a tobacco sheet is filled in the wrapper (see FIG. 1(D)). The tobacco segment 20A is preferably rod-shaped, and may have a length of about 15 to 80 mm and a diameter of about 5 to 10 mm. The size of the cut piece is not limited, but may have a longest side of about 2 to 20 mm and a width of about 0.5 to 1.5 mm, for example.

[0031] In another embodiment, the tobacco segment 20A includes a cylindrical wrapper 22 and strand-type shreds filled in the wrapper (see FIG. 1(E)). The strand-type shreds are filled so that their longitudinal direction is approximately parallel to the longitudinal direction of the wrapper 22. The width of the strand-type shreds may be about 0.5 to 1.5 mm.

[0032] In another embodiment, the tobacco segment 20A includes a tubular wrapper 22 and a tobacco shred filler randomly packed within the wrapper. The tobacco shred is cut and is different from strand-type shred.

[0033] 2. Manufacturing method The tobacco sheet may be produced by any method, but is preferably produced by a method comprising the following steps: Step 1 of preparing a mixture containing at least a tobacco material, the cellulose derivative, and a medium; Step 2 of spreading the mixture on a substrate to prepare a wet wipe; and Step 3: drying the wet wipes.

[0034] (1) Process 1 In this step, the tobacco material, the cellulose derivative as a binder, and the medium are mixed. If necessary, an aerosol generating base material, an emulsifier, or a flavoring may be added. The amount of each component is adjusted so as to achieve the aforementioned amount. The medium is preferably composed mainly of a water-soluble organic solvent having a boiling point of less than 100°C, such as water or ethanol, and more preferably water or ethanol. There is no limitation on the mixing method, and known equipment such as a mixer or kneader can be used. There is no limitation on the solid content concentration of the mixture obtained by mixing, and it is appropriately adjusted to be suitable for step 2. For example, the upper limit of the solid content concentration is preferably 98% by weight or less, 90% by weight or less, or 80% by weight or less, and the lower limit is preferably 10% by weight or more, 20% by weight or more, 30% by weight or more, 40% by weight or more, or 50% by weight or more.

[0035] (2) Process 2 In this step, the mixture is spread on a substrate to prepare a wet sheet. The substrate is not limited, and includes inorganic substrates such as glass plates, metal substrates such as aluminum plates, organic substrates such as PET films and fluoropolymer films, and fiber substrates such as nonwoven fabrics. The method of spreading the mixture on the substrate is not limited, and includes rolling method in which the mixture is pressed and spread using a roller, extrusion method in which the mixture is extruded from a die, and casting method in which the mixture is cast, as described below.

[0036] (3) Drying process In this step, the wet sheet is dried. Drying can be carried out according to a known method. For example, the wet sheet can be air-dried at room temperature, or dried by heating. The heating temperature is not limited, and can be, for example, 60 to 150°C. The dried sheet is separated from the substrate to obtain a tobacco sheet.

[0037] A preferred embodiment of the method for producing a tobacco sheet of the present invention will be described below. [Rolling method] 1) Process 1 1-1) Crushing The raw material (e.g., single leaves) is roughly crushed. Then, fine grinding is performed using a grinder (e.g., ACM-5, manufactured by Hosokawa Micron). The particle size (D90) after fine grinding is preferably 50 to 800 μm. The particle size is measured using a laser diffraction type particle sizer such as Mastersizer (manufactured by Malvern).

[0038] 1-2) Preparation of wet powder A binder and, if necessary, additives such as flavorings and lipids are added to the ground tobacco raw material (e.g., tobacco particles) and mixed. This mixing is preferably a dry blend, and therefore a mixer is preferably used as a mixer. Next, a medium such as water and, if necessary, an aerosol-generating base material such as glycerin are added to the dry blend and mixed in a mixer to prepare a wet powder (powder in a wet state). The amount of the medium in the wet powder can be 20 to 80% by weight, preferably 20 to 40% by weight, but may be 20 to 50% by weight since compression is performed in step 2. The solid content of the wet powder is preferably 50 to 90% by weight.

[0039] 1-3) Mixing The wet powder is kneaded using a single- or multi-screw kneader, such as a kneader (DG-1 manufactured by Dalton, etc.). Kneading is preferably carried out until the medium is distributed throughout the mixture, for example, until the color of the mixture is visually uniform.

[0040] 2) Process 2 (pressing) The kneaded mixture is sandwiched between two base films and passed through a pair of rollers using a calendaring device (e.g., manufactured by Yuri Roll Machine Co., Ltd.) until a predetermined thickness (more than 100 μm) is reached, and then pressed to obtain a laminate in which a wet sheet is present between two base films. Pressing with the rollers can be carried out multiple times. The base film is preferably a non-adhesive film such as a fluorine-based polymer film, and specifically, a Teflon (registered trademark) film can be mentioned.

[0041] 3) Process 3 One of the substrate films in the laminate is peeled off. The laminate is dried using a forced-air dryer. The drying temperature is preferably 50 to 100°C, and the drying time can be 1 to 2 minutes. Next, the remaining substrate film is peeled off, and the tobacco sheet is obtained by further drying under the above conditions. By drying in this manner, it is possible to prevent the tobacco sheet from adhering to other substrates.

[0042] The tobacco sheet obtained by this method is also called a "laminated sheet." Laminated sheets have a smooth surface, which is preferable because it prevents the occurrence of chipping when they come into contact with other materials. This method is also suitable for producing sheets with a thickness of 300 μm or less.

[0043] [Extrusion method] 1) Process 1 Step 1 in this method is as explained in the rolling method. A wet powder (powder in a wet state) is prepared. When extrusion is performed in step 2, the amount of the medium in the wet powder can be selected in the range of 20 to 80% by weight, and is preferably 20 to 40% by weight. 2) Process 2 In this process, the wet powder is extruded through a die having a predetermined gap to form a wet sheet on the substrate. A known extruder can be used for the extrusion. 3) Process 3 In this process, the wet sheet is dried to obtain a tobacco sheet. The drying conditions are the same as those described for the rolling method. The tobacco sheet obtained by this method is also called an "extruded sheet." Extruded sheets are preferable because they have a smooth surface and can prevent chipping when they come into contact with other parts. This method is suitable for producing sheets with a thickness of 200 μm or more.

[0044] Moreover, a sheet formed by applying pressure in this manner is called a "pressure-formed sheet", which includes a "laminated sheet" and an "extruded sheet". A laminated sheet is a sheet obtained by pressing a mixture with a roller at least once to a target thickness, and then drying to a target moisture content. An extruded sheet is a sheet obtained by extruding a mixture from a T-die or the like to a target thickness, and then drying to a target moisture content. In a pressure-formed sheet, pressing and extrusion may be combined. For example, the mixture may be extruded and then further pressed to form a sheet.

[0045] [Cast method] 1) Process 1 Step 1 in this method can be carried out by any method. For example, a mixture can be prepared by mixing a tobacco raw material having a desired particle size, a cellulose derivative, a medium, and, if necessary, additives in a mixer or the like. The solid content concentration of the mixture obtained in this step is preferably about 3 to 15% by weight, and therefore the mixture is also called a slurry.

[0046] 2) Process 2 In this step, the slurry is cast onto a substrate to form a wet sheet. Casting can be carried out in a known manner.

[0047] 3) Process 3 In this process, the wet sheet is dried to obtain a tobacco sheet. The drying conditions are the same as those described for the rolling method. The tobacco sheet obtained by this method is also called a "cast sheet."

[0048] 3. Smoking articles

[0049] Examples of smoking articles include flavor inhalation articles that allow users to inhale and enjoy flavors, and smokeless tobacco (smokeless smoking articles) that allow users to directly inhale the product into the nasal cavity or oral cavity and enjoy flavors. Flavor inhalation articles can be broadly divided into combustion-type smoking articles, typified by conventional cigarettes, and non-combustion-type smoking articles. The tobacco sheet of the present invention is suitable for flavor inhalation articles.

[0050] Examples of the combustion type flavor inhalation article include cigarettes, pipes, kiseru, cigars, and cigarillos.

[0051] The non-combustion heating type flavor inhalation article may be heated by a heating device separate from the article, or may be heated by a heating device integrated with the article. In the former flavor inhalation article (separate type), the non-combustion heating type flavor inhalation article and the heating device are collectively referred to as a "non-combustion heating type smoking system." An example of a non-combustion heating type smoking system will be described below with reference to Figs. 2 and 3.

[0052] Fig. 2 is a cross-sectional schematic diagram showing an example of a non-combustion heating-type smoking system, and shows a state before a heater 12 is inserted into a tobacco segment 20A of a non-combustion heating-type flavor inhalation article 20. During use, the heater 12 is inserted into the tobacco segment 20A. Fig. 3 is a cross-sectional view of the non-combustion heating-type flavor inhalation article 20.

[0053] 2, the non-combustion heating smoking system includes a non-combustion heating flavor inhalation article 20 and a heating device 10 that heats the tobacco segment 20A from the inside. However, the non-combustion heating smoking system is not limited to the configuration shown in FIG.

[0054] The heating device 10 shown in Fig. 2 includes a body 11 and a heater 12. Although not shown, the body 11 may include a battery unit and a control unit. The heater 12 may be an electric resistance heater, and is inserted into the tobacco segment 20A to heat the tobacco segment 20A.

[0055] The tobacco sheet of the present invention is highly effective when the tobacco segments 20A are heated from the inside, as shown in Fig. 2. In such a heating method, the tobacco sheet and the heater are in direct contact with each other, which has traditionally tended to cause chipping. However, in the tobacco sheet of the present invention, chipping is unlikely to occur even in such a case, so the tobacco sheet of the present invention is more effective in an internal heating method. However, the embodiment of the non-combustion heating type flavor inhalation article 20 is not limited to this, and in another embodiment, the tobacco segments 20A are heated from the outside.

[0056] The heating temperature by the heating device 10 is not particularly limited, but is preferably 400° C. or less, more preferably 50 to 400° C., and even more preferably 150 to 350° C. The heating temperature refers to the temperature of the heater 12 of the heating device 10.

[0057] As shown in Fig. 3, the non-combustion heating type flavor inhalation article 20 (hereinafter simply referred to as "flavor inhalation article 20") has a cylindrical shape. The circumferential length of the flavor inhalation article 20 is preferably 16 mm to 27 mm, more preferably 20 mm to 26 mm, and even more preferably 21 mm to 25 mm. The overall length (horizontal length) of the flavor inhalation article 20 is not particularly limited, but is preferably 40 mm to 90 mm, more preferably 50 mm to 75 mm, and even more preferably 50 mm to 60 mm.

[0058] The flavor inhalation article 20 is composed of a tobacco segment 20A, a filter portion 20C forming a mouthpiece, and a connecting portion 20B connecting these together.

[0059] The tobacco segment 20A is cylindrical, and its total length (length in the axial direction) is, for example, preferably 5 to 100 mm, more preferably 10 to 50 mm, and even more preferably 10 to 25 mm. The cross-sectional shape of the tobacco segment 20A is not particularly limited, and may be, for example, circular, elliptical, polygonal, etc.

[0060] The tobacco segment 20A comprises a tobacco sheet or material derived therefrom 21 and a wrapper 22 wrapped around it. The wrapper 22 may also be the tobacco sheet 1 of the present invention.

[0061] The filter section 20C has a cylindrical shape. The filter section 20C has a rod-shaped first segment 25 filled with cellulose acetate fiber and a rod-shaped second segment 26 similarly filled with cellulose acetate fiber. The first segment 25 is located on the tobacco segment 20A side. The first segment 25 may have a hollow portion. The second segment 26 is located on the mouthpiece side. The second segment 26 is solid. The first segment 25 is composed of a first filling layer (cellulose acetate fiber) 25a and an inner plug wrapper 25b wound around the first filling layer 25a. The second segment 26 is composed of a second filling layer (cellulose acetate fiber) 26a and an inner plug wrapper 26b wound around the second filling layer 26a. The first segment 25 and the second segment 26 are connected by an outer plug wrapper 27. The outer plug wrapper 27 is adhered to the first segment 25 and the second segment 26 by a vinyl acetate emulsion adhesive or the like.

[0062] The length of the filter portion 20C can be, for example, 10 to 30 mm, the length of the connecting portion 20B can be, for example, 10 to 30 mm, the length of the first segment 25 can be, for example, 5 to 15 mm, and the length of the second segment 26 can be, for example, 5 to 15 mm. These lengths of the individual segments are merely examples and can be changed as appropriate depending on the manufacturing suitability, the required quality, the length of the tobacco segment 20A, etc.

[0063] For example, the first segment 25 (center hole segment) is composed of a first packed layer 25a having one or more hollow portions, and an inner plug wrapper 25b that covers the first packed layer 25a. The first segment 25 has a function of increasing the strength of the second segment 26. The first packed layer 25a of the first segment 25 is packed with, for example, cellulose acetate fibers at a high density. A plasticizer containing triacetin is added to the cellulose acetate fibers in an amount of, for example, 6 to 20 mass % relative to the mass of the cellulose acetate, and the fibers are hardened. The hollow portion of the first segment 25 has an inner diameter of, for example, φ1.0 to φ5.0 mm.

[0064] The first packed layer 25a of the first segment 25 may be configured with, for example, a relatively high fiber packing density, or may be equivalent to the fiber packing density of the second packed layer 26a of the second segment 26 described later. Therefore, during inhalation, air and aerosol flow only through the hollow portion, and almost no air or aerosol flows through the first packed layer 25a. For example, when it is desired to reduce the loss of aerosol components due to filtration in the second segment 26, the length of the second segment 26 can be shortened and the first segment 25 can be lengthened accordingly.

[0065] Replacing the shortened second segment 26 with the first segment 25 is effective for increasing the delivery amount of the aerosol components. Since the first packed layer 25a of the first segment 25 is a fiber packed layer, the feel from the outside during use does not cause discomfort to the user.

[0066] The second segment 26 is composed of a second packed layer 26a and an inner plug wrapper 26b that covers the second packed layer 26a. The second segment 26 (filter segment) is packed with cellulose acetate fibers at a general density and has general filtering performance for filtering aerosol components.

[0067] The filtering performance for filtering the aerosol (mainstream smoke) emitted from the tobacco segment 20A may be different between the first segment 25 and the second segment 26. At least one of the first segment 25 and the second segment 26 may contain a flavoring. The filter portion 20C may have any structure, and may have a structure having a plurality of segments as described above, or may be composed of a single segment. The filter portion 20C may also be composed of one segment. In this case, the filter portion 20C may be composed of either the first segment or the second segment.

[0068] The connecting part 20B has a cylindrical shape. The connecting part 20B has a cardboard tube 23 formed into a cylindrical shape using, for example, cardboard. The connecting part 20B may be filled with a cooling material for cooling the aerosol. An example of the cooling material is a sheet of a polymer such as polylactic acid, which can be folded and filled. Furthermore, a support part for suppressing the position of the tobacco segment 20A from fluctuating may be provided between the tobacco segment 20A and the connecting part 20B. The support part may be made of a known material such as a center hole filter like the first segment 25.

[0069] The wrapper 28 is wrapped around the tobacco segment 20A, the connecting portion 20B, and the filter portion 20C in a cylindrical shape to integrally connect them. A vinyl acetate emulsion adhesive is applied to the entire or nearly entire surface of one surface (inner surface) of the wrapper 28, except for the vicinity of the ventilation hole portion 24. The ventilation hole portion 24 is formed by laser processing from the outside after the tobacco segment 20A, the connecting portion 20B, and the filter portion 20C are integrated by the wrapper 28.

[0070] The ventilation hole section 24 has two or more through holes penetrating the connecting section 20B in the thickness direction. The two or more through holes are formed so as to be radially arranged when viewed from an extension line of the central axis of the flavor inhalation article 20. In this embodiment, the ventilation hole section 24 is provided in the connecting section 20B, but may be provided in the filter section 20C. In addition, in this embodiment, the two or more through holes of the ventilation hole section 24 are arranged in one row at a certain interval on one ring, but may be arranged in two rows at a certain interval on two rings, or one or two rows of the ventilation hole section 24 may be arranged discontinuously or irregularly. When a user holds the mouthpiece in his / her mouth and inhales, outside air is taken into the mainstream smoke through the ventilation hole section 24. However, the ventilation hole section 24 may not be provided. EXAMPLES

[0071] [Example 1] Tobacco leaves were pulverized using a grinder (ACM-5, manufactured by Hosokawa Micron) to obtain leaf tobacco particles with a D90 of 50 to 800 μm. D90 was measured using a Mastersizer (manufactured by Malvern). Leaf tobacco particles and carboxymethylcellulose (Sunrose F F30MC, manufactured by Nippon Paper Industries Co., Ltd.) as a binder were dry-blended using a mixer. Next, glycerin as an aerosol-generating base material and water as a medium were added to the dry blend, and the mixture was mixed in a mixer to prepare a wet powder. The composition of each component is as follows:

[0072] [Table 1]

[0073] In the weight of wet powder in Table 1, the tobacco leaf grinding material, glycerin, and binder indicate the dry weight, while the water indicates the total weight of the feed weight and the weight of water contained in the tobacco leaf grinding material, glycerin, and binder.

[0074] The wet powder was kneaded six times at room temperature using a kneader (DG-1, manufactured by Dalton Co., Ltd.) to obtain a mixture. The die shape was T-shaped (T die), and the screw rotation speed was 38.5 rpm.

[0075] The wet powder was sandwiched between two Teflon (registered trademark) films (NITOFLON (R) No. 900UL, manufactured by Nitto Denko Corporation) and rolled in four stages using a calendaring device (manufactured by Yuri Roll Machinery Co., Ltd.) until the desired thickness (over 100 μm) was reached, to prepare a 105 μm-thick laminate having a layered structure of film / wet sheet / film. The roll gaps for the first to fourth stages were 650 μm, 330 μm, 180 μm, and 5 μm, respectively. The roll gap for the fourth stage was set to a value smaller than the thickness of the final sheet obtained. thin However, this is because the sheet, upon release from the pressure between the rollers, expands to near its final thickness.

[0076] One Teflon (registered trademark) film was peeled off from the laminate, and the sheet was dried at 80° C. for 1 to 2 minutes using a forced air dryer. The other film was then peeled off, and the wet sheet was dried under the same conditions to produce the tobacco sheet of the present invention.

[0077] [Examples 2 to 5] Tobacco sheets were produced and evaluated in the same manner as in Example 1, except that the carboxymethyl celluloses shown in Table 2 (all manufactured by Nippon Paper Industries Co., Ltd.) were used as binders.

[0078] [Comparative Example 1] Tobacco sheets were produced and evaluated in the same manner as in Example 1, except that carboxymethyl cellulose (manufactured by Nippon Paper Industries Co., Ltd.) shown in Table 2 was used as the binder. The results are shown in Table 3. In the table, the finished sheet properties indicate the properties of the sheet produced through drying as described above, but not dried to an absolutely dry state.

[0079] [Table 2]

[0080] [Table 3]

[0081] The evaluation method is explained below. [Volume of overflow] A non-combustion internal heating smoking system as shown in FIG. 2 was prepared. The tobacco sheets prepared in each example were cut to prepare shreds. The shreds were filled into a wrapper 22 having a length of 12 mm and a diameter of 7 mm at 70% by volume to prepare a tobacco segment 20A. The system was subjected to a smoking test using a smoking machine (14 puffs, CIR conditions, constant heating at 350°C). After the smoking test, the shreds were gently removed from the tobacco segment 20A. Then, the wrapper 22 was filled again with new shreds at 70% by volume to perform a second smoking test. In this way, a total of 20 smoking tests were performed, and the volume of the total shreds remaining in the wrapper 22 was measured.

[0082] [Surface roughness] Measurements were performed using a microscope (Keyence VK-X100) according to the following procedure. 1) Set the focal position at the lowest part of the sheet 2) Set the focal position on the highest part of the sheet 3) Divide the sections obtained in 1) and 2) above, and take images while shifting the focus little by little. 4) Measure the height from the difference between the focal position of each part and the focal position of the lowest part. 5) Calculate the roughness from the height data at each position (automatically calculated by the measuring instrument software) and calculate the arithmetic surface roughness Sa.

[0083] [Coagulability after heating] A non-combustion internal heating smoking system was prepared under the conditions described in the volume of chopped off, and a smoking test was performed once under the same conditions. After the test, a tobacco segment 20A was removed from the system, and a jig was placed on it at a position 6 mm from the tip in the longitudinal direction, and it was compressed in the radial direction at a constant speed. The load (N) was measured when the jig reached a position of 3.5 mm, and the solidification property after heating was evaluated. The higher the load value, the easier the chopped off will be to solidify after heating, and the less likely chopped off will occur.

[0084] [Tensile strength] The obtained sheet was cut to a width of 15 mm and a length of 180 mm, and measured using a tensile strength tester (Strograph ES, Toyo Seiki Seisakusho Co., Ltd.) under conditions of ROAD RANGE: 25 and SPEED RANGE: 50, and the tensile strength was evaluated in terms of tensile stress.

[0085] [Substitution degree] It was determined by the above-mentioned measurement method. [Explanation of symbols]

[0086] 1 Tobacco Sheet 1c Cut pieces of tobacco sheets 10 Heating device 11. Body 12 Heater 20 Non-combustion heating type flavor inhalation products 20A Tobacco Segment 20B Connecting part 20C Filter section 21 Tobacco sheets or materials derived therefrom 22 Rapper 23 Paper tube 24 Ventilation hole section 25 First Segment 25a 1st packed bed 25b Inner plug wrapper 26 Second Segment 26a 2nd packed bed 26b Inner plug wrapper 27 Outer plug wrapper 28 Rapper

Claims

1. A tobacco material; A cellulose derivative having a degree of substitution of 0.7 or more; an aerosol-generating substrate; Does not contain chitosan A tobacco sheet comprising: The tobacco sheet contains 1 to 5% by weight of the cellulose derivative and 1 to 40% by weight of the aerosol-forming substrate.

2. The sheet according to claim 1 , wherein the degree of substitution is 0.8 or more.

3. 3. The sheet according to claim 1 or 2, wherein the cellulose derivative is a carboxyalkylated cellulose.

4. The sheet according to any one of claims 1 to 3, having an arithmetic mean surface roughness Sa of 0.03 mm or less.

5. The sheet according to any one of claims 1 to 4, which is a pressure-molded sheet.

6. Step 1 of preparing a mixture containing at least a tobacco material, the cellulose derivative, the aerosol-forming substrate, and a medium; Step 2 of spreading the mixture on a substrate to prepare a wet wipe; and Step 3: drying the wet wipes; The method for producing the sheet according to any one of claims 1 to 5, comprising:

7. The method according to claim 6, wherein step 1 comprises kneading a tobacco material, the cellulose derivative, the aerosol-forming substrate, and a medium in a single-screw or multi-screw kneader.

8. The method according to claim 6 or 7, wherein step 2 comprises rolling the mixture with a roller or extruding the mixture through a die.

9. The method according to claim 8 , wherein step 2 includes preparing a laminate sheet in which the wet sheet is present between two substrate films.

10. A non-combustion heating type smoking article comprising the tobacco sheet according to any one of claims 1 to 5 or a material derived therefrom.

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