Rolled sheet, tobacco filler, smoking product, and method for manufacturing rolled sheet

Abstract

The present invention addresses the problem of providing a rolled sheet which can be manufactured at a low cost and has good thermal conductivity.　This rolled sheet contains calcium carbonate.

Description

Rolled sheet, tobacco filler, smoking article, and method for manufacturing rolled sheet

[0001] The present invention relates to a rolled sheet, a tobacco filler, a smoking article, and a method for manufacturing the rolled sheet.

[0002] Imitation tobacco is a tobacco material artificially formed into a paper-like form using tobacco leaves as a raw material, and is also called tobacco sheet. Known methods for producing such tobacco sheets include a papermaking process, a slurry (cast) process, a rolling (lamination) process, and an extrusion molding process.

[0003] In the papermaking and casting methods described above, the moisture content of the raw material composition is high before drying and forming it into a sheet (for example, the moisture content of the raw material composition in the casting method is about 80% W.B. (wet basis)). Therefore, when reducing the moisture content of the raw material composition to a predetermined range through a drying process and forming the sheet, a large amount of heat must be supplied, resulting in high production costs. On the other hand, the rolling method is a method in which a kneaded material with a low moisture content of about 50% W.B. or less is compressed and formed, and the moisture content of the kneaded material before drying and forming it into a sheet can be reduced. As a result, when forming the sheet, the moisture content of the kneaded material can be reduced to a predetermined range with a small amount of heat, thereby keeping production costs low.

[0004] Furthermore, in order to further enhance the functionality of combustion smoking articles or non-combustion heat smoking articles, it is conceivable to mix a substance with tobacco material that has better thermal conductivity than tobacco raw materials. In the case of combustion smoking articles, controlling thermal conductivity allows for control of spontaneous combustion and inhaled smoke combustion. This contributes to controlling the generation of smoke components and the number of puffs in combustion smoking articles. Furthermore, in the case of non-combustion heat smoking articles, it is possible to control the temperature distribution within the tobacco stick during heating, contributing to the generation of aerosol components. The inventors focused on calcium carbonate, which is used in cigarette paper for combustion smoking articles, as a substance with such properties. Calcium carbonate is inexpensive, which can lead to further cost reductions.

[0005] To date, there have been no cases in which a rolling method has been used to manufacture a tobacco sheet and calcium carbonate has been mixed in. In light of this situation, the inventors of the present application have conducted extensive research and discovered that a tobacco sheet can be formed even when a rolling method is used to manufacture a tobacco sheet and calcium carbonate is mixed in as a raw material. An object of the present invention is to provide a rolled sheet that can keep manufacturing costs low and has good thermal conductivity.

[0006] As a result of intensive research aimed at solving the above-mentioned problems, the inventors discovered that the above-mentioned problems could be solved by using a rolling method and mixing calcium carbonate as a raw material, leading to the completion of the present invention. Specific aspects of the present invention are as follows: [1] A rolled sheet containing calcium carbonate. [2] The rolled sheet according to [1], wherein the particle size (D50) of the calcium carbonate is 0.07 to 80 μm. [3] The rolled sheet according to [1] or [2], wherein the content of the calcium carbonate in the rolled sheet is 1 to 80 wt %. [4] The rolled sheet according to any one of [1] to [3], further comprising a tobacco raw material. [5] The rolled sheet according to any one of [1] to [4], further comprising a reinforcing material. [6] The rolled sheet according to any one of [1] to [5], further comprising a thickener. [7] The rolled sheet according to any one of [1] to [6], further comprising a humectant. [8] The rolled sheet according to any one of [1] to [7], further comprising an aerosol generating source. [9] The rolled sheet according to any one of [1] to [8], further comprising a flavorant, a colorant, a humectant, a preservative, or a combination thereof.

[10] A tobacco filler comprising the rolled sheet according to any one of [1] to [9].

[11] A smoking article comprising the tobacco filler according to

[10] .

[12] The smoking article according to

[11] , which is a combustion smoking article.

[13] The smoking article according to

[11] , which is a non-combustion heat smoking article.

[14] A method for producing the rolled sheet according to any one of [1] to [9], comprising the steps of: preparing a composition comprising calcium carbonate; and rolling and drying the composition.

[0007] The present invention can provide a rolled sheet with good thermal conductivity while keeping production costs low.

[0008] Fig. 1 is a cross-sectional view showing an example of a non-combustion heat smoking system. Fig. 2 is a cross-sectional view showing an example of a non-combustion heat smoking article.

[0009] The present invention will be described in detail below. In the present invention, "X to Y" includes the extreme values ​​X and Y.

[0010] 1. Rolled Sheet The rolled sheet (laminated sheet) of the present invention contains calcium carbonate. In the present invention, by using a rolling method and mixing calcium carbonate as a raw material, a rolled sheet with good thermal conductivity can be obtained while keeping production costs low. Details of the rolled sheet are disclosed in "Encyclopedia of Tobacco," Tobacco Research Center, March 31, 2009.

[0011] (Calcium Carbonate) The particle size (D50) of calcium carbonate is not particularly limited, but is preferably 0.07 to 80 μm, more preferably 0.08 to 70 μm, and most preferably 0.1 to 50 μm. When the particle size (D50) of calcium carbonate is within the above numerical range, good thermal conductivity is exhibited. The particle size (D50) of calcium carbonate can be measured based on a dry laser diffraction method using a Mastersizer (manufactured by Malvern Panalytical Division, Spectris Inc.).

[0012] The content of calcium carbonate in the rolled sheet is not particularly limited, but is preferably 1 to 80% by weight, more preferably 1.5 to 70% by weight, and most preferably 2 to 60% by weight. The content of calcium carbonate in the rolled sheet can be expressed as a value based on % D.B. (dry basis) (weight % converted to solids). When the raw material composition (tobacco preparation) of the rolled sheet contains a medium such as water, the rolled sheet can be formed by removing the medium from the tobacco preparation. In this case, the content of calcium carbonate in the rolled sheet can be calculated based on the content of calcium carbonate in the tobacco preparation, taking into account the weight of the removed medium. Depending on the production method, calcium carbonate can be heavy calcium carbonate obtained by pulverizing and classifying natural calcium carbonate, or light calcium carbonate produced by chemical synthesis, and either can be used.

[0013] (Tobacco Raw Material) The rolled sheet can further contain a plant material, such as tobacco, in particular a tobacco raw material. Tobacco raw materials are materials derived from Nicotiana plants, and examples include tobacco raw materials such as tobacco leaves, aged tobacco leaves, tobacco shreds, tobacco powder, parts other than leaves such as midribs and stem residues, and processed products or waste products obtained by subjecting tobacco raw materials to processing. Tobacco leaves are a general term for harvested tobacco leaves before they undergo aging. One form of aging includes curing. Tobacco shreds are aged tobacco leaves or the like that have been shredded to a specified size. Tobacco powder is pulverized tobacco leaves or the like. Plant materials other than tobacco species, such as tea leaves and vegetables, can also be mixed with the tobacco raw material or used alone.

[0014] Various tobacco varieties can be used as the tobacco raw material. Examples of tobacco varieties include flue-cured, burley, oriental, native, other Nicotiana tabacum, and Nicotiana rustica varieties. These varieties can be used alone, or blended to obtain the desired flavor, from the harvesting of tobacco leaves to the processing of cured tobacco leaves into various forms (i.e., processed tobacco leaves) used in non-combustible heat-not-burn tobacco products. Details of the tobacco varieties are disclosed in "Encyclopedia of Tobacco," Tobacco Research Center, March 31, 2009.

[0015] The tobacco raw material is not particularly limited, but may contain or consist of tobacco powder (ground whole tobacco leaves), backbone powder (ground backbone only), or a mixture thereof. By using these components as tobacco raw materials, a sufficient tobacco aroma can be generated during use.

[0016] Regarding the size of the tobacco raw material, the cumulative 90% particle diameter (D90) in the volume-based particle size distribution measured by dry laser diffraction is preferably 200 μm or more, more preferably 300 μm or more, and even more preferably 500 μm or more. The upper limit of the D90 range is not particularly limited, but can be, for example, 2000 μm or less. Furthermore, regarding the size of the tobacco raw material, from the viewpoint of further improving the swelling bulk of the tobacco sheet, the cumulative 50% particle diameter (D50) in the volume-based particle size distribution measured by dry laser diffraction is preferably 40 μm or more, more preferably 100 μm or more, and even more preferably 200 μm or more. The upper limit of the D50 range is not particularly limited, but can be, for example, 1000 μm or less. Note that in this embodiment, measurement of D90 and D50 by dry laser diffraction can be performed using, for example, a Mastersizer (trade name, manufactured by Spectris Co., Ltd., Malvern Panalytical Division).

[0017] The content of the tobacco raw material in the rolled sheet is not particularly limited, but is preferably 0.1 to 80% by weight, more preferably 1.0 to 75% by weight, and most preferably 1.5 to 70% by weight. By having the content of the tobacco raw material within the above numerical range, a tobacco aroma can be imparted during use. The content of the tobacco raw material in the rolled sheet can be a value based on % D.B. (dry basis).

[0018] (Reinforcing Material) The rolled sheet may further contain a reinforcing material. The reinforcing material is not particularly limited, but may contain or consist of pulp, fibrous materials such as insoluble fibers and fibrous synthetic cellulose, liquid materials with a surface coating function that forms a film when dried, such as pectin suspension, or a mixture of two or more of these. Among these, pulp is preferred. The use of pulp can improve the physical properties of the rolled sheet.

[0019] The pulp is not particularly limited, but may contain or consist of fibrous pulp, cotton-like pulp, powdered pulp, or a mixture of two or more of these. Among these, fibrous pulp is preferred. Use of fibrous pulp can improve the physical properties of the rolled sheet.

[0020] The content of the reinforcing material in the rolled sheet is not particularly limited, but is preferably 1 to 60% by weight, more preferably 1.5 to 55% by weight, and most preferably 2 to 50% by weight. By keeping the content of the reinforcing material within the above numerical range, the physical properties of the rolled sheet can be improved. The content of the reinforcing material in the rolled sheet can be a value based on % D.B. (dry basis).

[0021] (Thickener) The rolled sheet may further contain a thickener. The thickener is not particularly limited, but examples thereof include polysaccharides, proteins, synthetic polymers, etc. These may be used alone or in combination of two or more. Examples of polysaccharides include cellulose derivatives and naturally occurring polysaccharides.

[0022] Examples of cellulose derivatives include cellulose ethers such as methyl cellulose, ethyl cellulose, hydroxyethyl cellulose, hydroxymethylethyl cellulose, hydroxypropyl cellulose, hydroxypropylmethyl cellulose, benzyl cellulose, trityl cellulose, cyanoethyl cellulose, carboxymethyl cellulose, carboxyethyl cellulose, and aminoethyl cellulose; organic acid esters such as cellulose acetate, cellulose formate, cellulose propionate, cellulose butyrate, cellulose benzoate, cellulose phthalate, and tosyl cellulose; and inorganic acid esters such as cellulose nitrate, cellulose sulfate, cellulose phosphate, and cellulose xanthate. These may be used alone or in combination of two or more.

[0023] Examples of naturally occurring polysaccharides include plant-derived polysaccharides such as guar gum, tara gum, roasted bean gum, tamarind seed gum, pectin, gum arabic, tragacanth gum, karaya gum, ghatti gum, arabinogalactan, amazon seed gum, cassia gum, psyllium seed gum, and desert artemisia seed gum; algae-derived polysaccharides such as carrageenan, agar, alginic acid, propylene glycol alginate, furcellaran, and flavonoid extract; microbial polysaccharides such as xanthan gum, gellan gum, curdlan, pullulan, Agrobacterium succinoglycan, welan gum, macrophomopsis gum, and rhamsan gum; crustacean-derived polysaccharides such as chitin, chitosan, and glucosamine; starches such as starch, sodium starch glycolate, pregelatinized starch, corn starch, and dextrin; and polydextrin. These may be used alone or in combination of two or more.

[0024] Examples of proteins include grain proteins such as wheat gluten and rye gluten. Examples of synthetic polymers include polyphosphoric acid, sodium polyacrylate, polyvinylpyrrolidone, etc. These may be used alone or in combination of two or more.

[0025] The content of the thickener in the rolled sheet is not particularly limited, but is preferably 0.1 to 15 wt%, more preferably 0.2 to 13 wt%, and most preferably 0.5 to 12 wt%. By keeping the content of the thickener within the above range, the shape of the rolled sheet can be easily maintained. The content of the thickener in the rolled sheet can be a value based on % D.B. (dry basis).

[0026] (Humectant) The rolled sheet may further contain a humectant. The humectant is not particularly limited, but may contain or consist of sorbitol, erythritol, xylitol, maltitol, lactitol, mannitol, reduced maltose syrup, etc., or a mixture of two or more of these.

[0027] The content of the humectant in the rolled sheet is not particularly limited, but is preferably 0.1 to 15 wt%, more preferably 0.2 to 12 wt%, and most preferably 0.5 to 10 wt%. By keeping the content of the humectant within the above range, the quality of the rolled sheet can be easily maintained. The content of the humectant in the rolled sheet can be a value based on % D.B. (dry basis).

[0028] (Aerosol Source) The rolled sheet may further include an aerosol source. The aerosol source is not particularly limited, but may include glycerin, 1,2-propanediol, 1,3-propanediol, or a mixture of two or more of these. Among these, glycerin is preferred. By using glycerin, high-quality aerosol can be generated.

[0029] The content of the aerosol generating source in the rolled sheet is not particularly limited, but from the viewpoint of generating a sufficient amount of aerosol and obtaining a good flavor, it is usually 3% by weight or more, preferably 5% by weight or more, more preferably 7% by weight or more, and usually 50% by weight or less, preferably 40% by weight or less, more preferably 25% by weight or less, relative to the weight of the rolled sheet. The content of the aerosol generating source in the rolled sheet can be a value based on % D.B. (dry basis).

[0030] (Other Components) The rolled sheet may further contain other components such as flavorings, coloring agents, humectants, preservatives, or a combination of two or more thereof. The other components may be in any form, such as liquid or solid.

[0031] The type of flavoring is not particularly limited, and examples thereof include flavors and seasonings from the viewpoint of imparting a good smoking taste. Suitable flavors of the flavoring include those selected from tobacco extracts and tobacco components, sugar and sugar-based flavors, licorice, cocoa, chocolate, fruit juice and fruits, spices, liquor, herbs, vanilla, and flower-based flavors, either alone or in combination. Food powders or plant raw powders such as cocoa, licorice, tea, and vanilla beans may also be added as the flavor, either alone or in combination. A wide variety of flavoring ingredients can be used as the flavoring, for example, as described in "Collection of Well-Known and Commonly Used Techniques (Fragrances)" (published by the Japan Patent Office on March 14, 2007), "Latest Encyclopedia of Flavors (Popular Edition)" (edited by Soichi Arai, Akio Kobayashi, Izumi Yajima, and Michiaki Kawasaki, Asakura Publishing, on February 25, 2012), and "Tobacco Flavoring for Smoking Products" (published in June 1972 by RJ Reynolds Tobacco Company).

[0032] The fragrance may be, for example, a fragrance selected from isothiocyanates, indole and its derivatives, ethers, esters, ketones, fatty acids, higher aliphatic alcohols, higher aliphatic aldehydes, higher aliphatic hydrocarbons, thioethers, thiols, terpene hydrocarbons, phenol ethers, phenols, furfural and its derivatives, aromatic alcohols, aromatic aldehydes, lactones, etc., either alone or in combination. The fragrance may also be a material that imparts a cooling / warming sensation.

[0033] Examples of the flavoring agent include materials that exhibit sweetness, sourness, saltiness, umami, bitterness, astringency, and richness. Examples of materials that exhibit sweetness include sugars, sugar alcohols, and sweeteners. Examples of sugars include monosaccharides, disaccharides, oligosaccharides, and polysaccharides. Examples of sweeteners include natural sweeteners and synthetic sweeteners. Examples of materials that exhibit sourness include organic acids (and their sodium salts). Examples of organic acids include acetic acid, adipic acid, citric acid, lactic acid, malic acid, succinic acid, and tartaric acid. Examples of materials that exhibit bitterness include caffeine (extract), naringin, and wormwood extract. Examples of materials that exhibit saltiness include sodium chloride, potassium chloride, sodium citrate, potassium citrate, sodium acetate, and potassium acetate. Examples of materials that provide umami include sodium glutamate, sodium inosinate, sodium guanylate, etc. Examples of materials that provide astringency include tannin, shibuol, etc.

[0034] The total content of these flavorings is not particularly limited, but from the viewpoint of imparting a good smoking taste, it is, for example, usually 10 ppm or more, preferably 10,000 ppm or more, more preferably 50,000 ppm or more, and usually 250,000 ppm or less, preferably 200,000 ppm or less, more preferably 150,000 ppm or less, and even more preferably 100,000 ppm or less.

[0035] Examples of the coloring agent include natural dyes and synthetic dyes. Examples of natural dyes include caramel, turmeric, monascus, gardenia, safflower, carotene, marigold, and annatto. Examples of synthetic dyes include tar dyes and titanium oxide. Examples of the humectant include lipids (wax, glycerin, medium-chain fatty acid triglycerides, fatty acids (short-chain, medium-chain, and long-chain fatty acids)), polyols (glycerol, polyethylene glycol), and the like. Examples of the preservative include acetic acid, benzoic acid, propionic acid, citric acid, lactic acid, malic acid, sorbic acid, tartaric acid (and salts thereof), and nisin.

[0036] (Equilibrium Moisture Content) The equilibrium moisture content of the rolled sheet is preferably 9% or less, more preferably 7% or less, and most preferably 5% or less. The lower limit of the equilibrium moisture content can be greater than 0%, 1% or more, or 2% or more. The above numerical ranges for the equilibrium moisture content can be combined arbitrarily. A low equilibrium moisture content, particularly when used in a tobacco filler for a non-combustion heat-smoking article, can reduce the amount of heat consumed by water evaporation during heating, resulting in efficient aerosol generation. The equilibrium moisture content of the rolled sheet can be measured according to the procedures and methods described in (Evaluation of Rolled Sheet) (Equilibrium Moisture Content) in [Examples] below.

[0037] 2. Method for Producing Rolled Sheet The method for producing a rolled sheet of the present invention is the method for producing a rolled sheet described in 1 above, which includes the steps of: preparing a composition containing calcium carbonate; and rolling and drying the composition.

[0038] The step of preparing the composition may further include a step of mixing calcium carbonate with ingredients including a plant material such as tobacco material, a reinforcing material, a thickener, a humectant, an aerosol source, a flavoring agent, a colorant, a humectant, a preservative, or a combination of two or more of these. The calcium carbonate and each of the above ingredients may be those described in "1. Rolled Sheet" above.

[0039] The step of preparing the composition may further include a step of adding a medium. Such a medium may include, but is not limited to, water, alcohol, an emulsifier, etc., or may comprise or consist of a mixture of two or more of these. Among these, water is preferred. The use of water allows the mixture to be dispersed homogeneously.

[0040] The step of preparing the composition may further include a step of grinding the raw materials described above. The step of preparing the composition may further include a step of mixing a liquid raw material among the raw materials described above.

[0041] As a method for producing the rolled sheet of the present invention, a rolling method can be adopted.

[0042] <Method for Forming Rolled Sheet (Rolling Method)> Examples of methods for forming a rolled sheet by rolling include methods including the following steps. Each of the following steps can be used alone or in combination of two or more: (1) A step of mixing water, calcium carbonate, and the pulverized raw materials described above to obtain a mixture (homogenization step); (2) A step of feeding the mixture into a plurality of rolling rollers and rolling it; (3) A step of peeling the rolled product from the rolling rollers with a doctor knife, transferring it to a net conveyor, and drying it in a dryer, or a step of transferring the rolled product directly from one or more pairs of rolling rollers to a net conveyor and drying it in a dryer. When forming a rolled sheet by this method, the surface of each rolling roller may be heated or cooled, and the rotation speed of each rolling roller may be adjusted, depending on the purpose. Furthermore, a rolled sheet of a desired basis weight can be obtained by adjusting the spacing between each rolling roller.

[0043] The shape of the rolled sheet can be adjusted as needed, but in one embodiment, the thickness is 50 to 500 μm. The rolled sheet can be chopped to produce shreds or strands. The rolled sheet can also be wound up into a bobbin shape. The rolled sheet can also be pulverized to produce powder.

[0044] 3. Tobacco filler and smoking article The tobacco filler of the present invention comprises the above-described rolled sheet. The smoking article of the present invention comprises the above-described tobacco filler. The smoking article of the present invention can be a combustion smoking article or a non-combustion heat smoking article. The rolled sheet of the present invention can freely control the calcium carbonate content from low to high while maintaining a uniform mixed state. In a combustion smoking article, the calcium carbonate content can be made high enough that an aerosol generation source is not required, allowing the characteristics of the rolled sheet of the present invention to be more effectively utilized.

[0045] In this application, the term "smoking article" refers to an inhalation article that allows a user to enjoy a flavor by inhaling. Smoking articles can be broadly divided into combustion-type smoking articles, typified by conventional cigarettes, and non-combustion heat-type smoking articles.

[0046] Examples of combustion-type smoking articles include cigarettes, pipes, pipes, cigars, and cigarillos.

[0047] A non-combustion heat smoking article (heat smoking article) may be heated by a heating device separate from the article, or by a heating device integrated with the article. In the former smoking article (separate type), the non-combustion heat smoking article and the heating device are collectively referred to as a "non-combustion heat smoking system." An example of a non-combustion heat smoking system will be described below with reference to Figures 1 and 2.

[0048] Fig. 1 is a cross-sectional schematic diagram showing an example of a non-combustion heat smoking system, showing a state before a heater 12 is inserted into a smoking segment 20A of a non-combustion heat smoking article 20. During use, the heater 12 is inserted into the smoking segment 20A. Fig. 2 is a cross-sectional view of the non-combustion heat smoking article 20.

[0049] 1, the non-combustion heat smoking system includes a non-combustion heat smoking article 20 and a heating device 10 that heats the smoking segment 20A from the inside. However, the non-combustion heat smoking system is not limited to the configuration shown in FIG.

[0050] 1 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 smoking segment 20A to heat the smoking segment 20A.

[0051] In FIG. 1, the smoking segment 20A is heated from the inside, but the embodiment of the non-combustion heating smoking article 20 is not limited to this, and in another embodiment, the smoking segment 20A is heated from the outside.

[0052] 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. The heating method by the heating device is not particularly limited, and in addition to heating by the heater described above, induction heating, microwave heating, etc. can also be used.

[0053] As shown in Figure 2, the non-combustion heat smoking article 20 (hereinafter simply referred to as "smoking article 20") has a cylindrical shape. The circumferential length of the smoking 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 total length (horizontal length) of the smoking 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.

[0054] The smoking article 20 is composed of a smoking segment 20A, a filter portion 20C that forms the mouthpiece, and a connecting portion 20B that connects these together.

[0055] The smoking segment 20A is cylindrical, and its total length (axial length) 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 smoking segment 20A is not particularly limited, but may be, for example, circular, elliptical, polygonal, etc.

[0056] The smoking segment 20A comprises a smoking composition sheet or material derived therefrom 21 and a wrapper 22 wrapped therearound.

[0057] The filter section 20C has a cylindrical shape. The filter section 20C includes a rod-shaped first segment 25 filled with cellulose acetate fibers and a rod-shaped second segment 26 also filled with cellulose acetate fibers. The first segment 25 is located on the smoking 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 packing layer (cellulose acetate fibers) 25a and an inner plug wrapper 25b wrapped around the first packing layer 25a. The second segment 26 is composed of a second packing layer (cellulose acetate fibers) 26a and an inner plug wrapper 26b wrapped around the second packing 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 with a vinyl acetate emulsion adhesive or the like.

[0058] 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 manufacturability, required quality, the length of the smoking segment 20A, etc.

[0059] 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 functions to increase the strength of the second segment 26. The first packed layer 25a of the first segment 25 is densely packed with, for example, cellulose acetate fibers. This cellulose acetate fiber is hardened by adding a plasticizer containing triacetin in an amount of, for example, 6 to 20% by mass relative to the mass of the cellulose acetate. The hollow portion of the first segment 25 has an inner diameter of, for example, 1.0 to 5.0 mm.

[0060] The first packed layer 25a of the first segment 25 may be configured, for example, with a relatively high fiber packing density, or may have a fiber packing density equivalent to that of the second packed layer 26a of the second segment 26, which will be described later. Therefore, during inhalation, air or aerosol flows only through the hollow portion, and almost no air or aerosol flows through the first packed layer 25a. For example, if 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 lengthened accordingly.

[0061] Replacing the shortened second segment 26 with the first segment 25 is effective in increasing the amount of aerosol component delivered. Because 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.

[0062] The second segment 26 is composed of a second packed layer 26 a and an inner plug wrapper 26 b that covers the second packed layer 26 a. The second segment 26 (filter segment) is packed with cellulose acetate fibers at a typical density and has the ability to filter typical aerosol components.

[0063] The first segment 25 and the second segment 26 may have different filtering capabilities for filtering the aerosol (mainstream smoke) emitted from the smoking segment 20A. 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, including multiple segments as described above, or may be composed of a single segment. The filter portion 20C may also be composed of a single segment. In this case, the filter portion 20C may be composed of either the first segment or the second segment.

[0064] The connecting portion 20B is cylindrical. The connecting portion 20B has a cardboard tube 23 formed into a cylindrical shape using, for example, cardboard. The connecting portion 20B may be filled with a cooling material for cooling the aerosol. Examples of the cooling material include a sheet of polymer such as polylactic acid, which can be folded and filled. Furthermore, a support portion may be provided between the smoking segment 20A and the connecting portion 20B to prevent the position of the smoking segment 20A from shifting. The support portion may be made of a known material, such as a center hole filter like the first segment 25.

[0065] The wrapper 28 is wrapped around the outside of the smoking segment 20A, connecting portion 20B, and filter portion 20C in a cylindrical shape, connecting them together. One surface (inner surface) of the wrapper 28 is coated entirely or almost entirely with a vinyl acetate emulsion adhesive, except for the area around the ventilation holes 24. The ventilation holes 24 are formed by laser processing from the outside after the smoking segment 20A, connecting portion 20B, and filter portion 20C have been integrated by the wrapper 28.

[0066] The air vent section 24 has two or more through holes penetrating the connecting section 20B in the thickness direction. The two or more through holes are arranged radially when viewed from an extension of the central axis of the smoking article 20. In this embodiment, the air vent section 24 is provided in the connecting section 20B, but may also be provided in the filter section 20C. In addition, in this embodiment, the two or more through holes of the air vent section 24 are arranged in a single row at a fixed interval on one ring, but may also be arranged in two rows at a fixed interval on two rings, or one or two rows of the air vent sections 24 may be arranged discontinuously or irregularly. When a user holds the mouthpiece to their mouth and inhales, outside air is taken into the mainstream smoke through the air vent section 24. However, the air vent section 24 does not have to be provided.

[0067] The present invention will be experimentally explained by the following examples, but the following explanation is not intended to limit the scope of the present invention to the following examples.

[0068] (Raw Materials) The raw materials used in this example are as follows. Calcium carbonate: PCX-700 (Shiraishi Kogyo Co., Ltd., particle size (D50) 3.5 μm) Tobacco powder: flake, particle size (D50) 300 μm Bone powder: flake, particle size (D50) 300 μm Aerosol source: glycerin Reinforcing material: fibrous pulp (CANFORPULP, dry defibrated product, Canfor) Thickener: cornstarch (corn alpha Y), Sanwa Starch Industry Co., Ltd.), guar gum (Grindsted Guar 175, DUPONT DANISCO)

[0069] (Preparation of Rolled Sheet) [Example 1] Each raw material was charged into a mixer (SUPER MIXER, SMV-20A, manufactured by Kawata Corporation) so that the content of each raw material (% DB (dry basis), weight % converted to solid content) shown in Table 1 was achieved, and the mixture was stirred for 2 minutes to obtain a mixture. The obtained mixture was passed through two pairs of metal rolls (roll pressure: 6.35 MPa, roll gap: 0.1 mm, calendar rolls (manufactured by Yuri Roll Co., Ltd.)) and kneaded while applying shear force, to obtain a kneaded product.

[0070] The kneaded product obtained as described above was again passed through the two pairs of metal rolls and formed into a sheet, which was then dried in a hot air circulating oven at 90°C for 5 minutes to produce a rolled sheet of Example 1 (thickness: 0.2 mm, width: 250 mm).

[0071] [Examples 2 to 5 and Comparative Example] Each rolled sheet (thickness: 0.2 mm, width: 250 mm) of Examples 2 to 5 and Comparative Example was produced in the same manner as in Example 1 above, except that the content of each raw material was changed as shown in Table 1.

[0072]

[0073] (Evaluation of Rolled Sheets) The rolled sheets of Examples 2 and 5 and Comparative Example obtained as described above were evaluated as follows.

[0074] (Equilibrium Moisture Percentage) The equilibrium moisture percentage was calculated for each rolled sheet. Specifically, each rolled sheet was cut into 0.8 mm widths to obtain chopped carrots. The obtained chopped carrots were stored for 48 hours in a conditioned room at 22°C and a relative humidity of 60% to condition the carrots, and the weight of the carrots after conditioning (before drying) was measured. The conditioned carrots were placed in a rotary dryer at 100°C and dried for 1 hour, and the weight of the carrots after drying was measured. The equilibrium moisture percentage (% WB) was then calculated based on the following formula. The results are shown in Table 2. Equilibrium moisture percentage = (Wa - Wb) / Wa × 100 Wa: Weight of the carrots after conditioning (before drying) Wb: Weight of the carrots after drying

[0075]

[0076] Table 2 shows that the rolled sheets of Examples 5 and 6, which contain calcium carbonate, have a lower equilibrium moisture content than the rolled sheet of the Comparative Example, which does not contain calcium carbonate. A low equilibrium moisture content, particularly when used in tobacco fillers for non-combustion heat-smoking articles, can reduce the amount of heat consumed by water evaporation during heating, resulting in more efficient aerosol generation. In this respect, the rolled sheets of Examples 5 and 6 are superior to the rolled sheet of the Comparative Example.

[0077] As described above, in the present invention, by using a rolling method and mixing calcium carbonate as a raw material, it is possible to keep production costs low and produce a rolled sheet with good thermal conductivity.

[0078] REFERENCE SIGNS LIST 10 Heating device 11 Body 12 Heater 20 Non-combustion heated smoking article 20A Smoking segment 20B Connecting portion 20C Filter portion 21 Smoking composition sheet or material derived therefrom 22 Wrapper 23 Paper tube 24 Ventilation hole portion 25 First segment 25a First filling layer 25b Inner plug wrapper 26 Second segment 26a Second filling layer 26b Inner plug wrapper 27 Outer plug wrapper 28 Wrapper

Claims

1. A rolled sheet containing calcium carbonate.

2. The rolled sheet according to claim 1, wherein the particle diameter (D50) of the calcium carbonate is 0.07 to 80 μm.

3. 3. The rolled sheet according to claim 1, wherein the content of said calcium carbonate in said rolled sheet is 1 to 80% by weight.

4. The rolled sheet according to claim 1 or 2, further comprising a tobacco raw material.

5. The rolled sheet according to claim 1 or 2, further comprising a reinforcing material.

6. The rolled sheet according to claim 1 or 2, further comprising a thickener.

7. The rolled sheet according to claim 1 or 2, further comprising a moisturizing agent.

8. The rolled sheet according to claim 1 or 2, further comprising an aerosol generating source.

9. 3. The rolled sheet of claim 1 or 2, further comprising a flavoring agent, a coloring agent, a humectant, a preservative, or a combination thereof.

10. A tobacco filler comprising the rolled sheet according to claim 1 or 2.

11. A smoking article comprising the tobacco filler of claim 10.

12. The smoking article according to claim 11, which is a combustible smoking article.

13. The smoking article of claim 11, which is a non-combustion heat smoking article.

14. preparing a composition comprising calcium carbonate; and rolling and drying the composition The method for producing a rolled sheet according to claim 1 or 2, comprising: