Classifications

• • A—HUMAN NECESSITIES
  • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
  • A24B—MANUFACTURE OR PREPARATION OF TOBACCO FOR SMOKING OR CHEWING; TOBACCO; SNUFF
  • A24B15/00—Chemical features or treatment of tobacco; Tobacco substitutes, e.g. in liquid form
  • A24B15/10—Chemical features of tobacco products or tobacco substitutes
  • A24B15/12—Chemical features of tobacco products or tobacco substitutes of reconstituted tobacco
  • A24B15/14—Chemical features of tobacco products or tobacco substitutes of reconstituted tobacco made of tobacco and a binding agent not derived from tobacco
• • A—HUMAN NECESSITIES
  • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
  • A24B—MANUFACTURE OR PREPARATION OF TOBACCO FOR SMOKING OR CHEWING; TOBACCO; SNUFF
  • A24B3/00—Preparing tobacco in the factory
  • A24B3/14—Forming reconstituted tobacco products, e.g. wrapper materials, sheets, imitation leaves, rods, cakes; Forms of such products
• • A—HUMAN NECESSITIES
  • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
  • A24B—MANUFACTURE OR PREPARATION OF TOBACCO FOR SMOKING OR CHEWING; TOBACCO; SNUFF
  • A24B15/00—Chemical features or treatment of tobacco; Tobacco substitutes, e.g. in liquid form
  • A24B15/18—Treatment of tobacco products or tobacco substitutes
  • A24B15/24—Treatment of tobacco products or tobacco substitutes by extraction; Tobacco extracts

Definitions

• the present invention relates to an aerosol generating sheet.
• the aerosol-generating sheet serves as a flavor source for smoking articles.
• Patent documents 1 and 2 disclose aerosol-generating sheets that use tobacco extract as a tobacco-derived material.
• an objective of the present invention is to provide an efficient method for producing an aerosol-generating sheet.
• a manufacturing method comprising:
• Aspect 4 A method according to any one of Aspects 1 to 3, wherein the aerosol-generating sheet contains 15 to 50% by weight of the tobacco extract, on a dry matter basis.
• Aspect 5 said other component B comprising an aerosol source;
• Aspect 6 The method according to any one of claims 1 to 5, wherein the other components include non-wood fibers, wood fibers, or a binder.
• Aspect 7 The method according to claim 6, wherein the non-wood fiber is a dietary fiber.
• Aspect 8 The method of claim 7, wherein the non-wood fiber is a citrus fiber.
• Aspect 9 A method according to any one of claims 6 to 8, wherein the binder is a carboxyalkyl cellulose or a guar gum.
• Aspect 10 A method according to any one of claims 6 to 9, wherein the content of wood fibers is less than the content of non-wood fibers.
• the present invention provides an efficient method for manufacturing aerosol generating sheets.
• X-Y includes the extreme values X and Y.
• Dry weight is the weight excluding the weight of water.
• a method for manufacturing an aerosol-generating sheet containing tobacco extract E and other component B comprises the steps of (1) preparing a mixture containing the tobacco extract E and other component B and having a specific liquid-solid ratio, and (2) obtaining a sheet from the mixture.
• Step (1) Mixture Preparation Step
• a mixture containing tobacco extract E and other component B and satisfying the following relationship is prepared.
• Liquid-solid ratio weight of water in the mixture / weight of components other than water in the mixture ⁇ 3 If the liquid-solid ratio is less than 3, it becomes difficult to prepare the sheet. On the other hand, if the upper limit is too high, the amount of active ingredients in the obtained sheet decreases. From this viewpoint, the upper limit of the liquid-solid ratio is preferably 8 or less, more preferably 5 or less. A mixture having a liquid-solid ratio in this range can be subjected to the sheet manufacturing process without being concentrated. This makes it possible to suppress the reduction of flavor ingredients.
• the "components other than water in the mixture” include substances that are liquid at room temperature, in this disclosure, for convenience, the liquid-solid ratio is defined as above.
• the type of sheet obtained varies depending on the amount of components contained in the mixture.
• the liquid-solid ratio is preferably 3 to 5.
• the ratio of the dry weight of the tobacco extract E to the dry weight of the mixture is preferably 15 to 50% by weight.
• the liquid-solid ratio is preferably 3 to 5.
• the ratio of the dry weight of the aerosol source to the dry weight of the mixture is preferably 40 to 60% by weight.
• Tobacco Extract E is a substance or mixture that exhibits a flavor extracted from tobacco.
• the tobacco extract can be prepared by a known method.
• the medium used for extraction can be water or a hydrophilic organic solvent such as alcohol.
• the medium is water (this embodiment is also called “water extraction"), and in another embodiment, the medium is a mixed solvent of water and alcohol (this embodiment is also called “solvent extraction”).
• the alcohol can be a polyhydric alcohol such as propylene glycol or glycerin, or a monoalcohol such as ethanol.
• the alcohol is preferably an aerosol source, which will be described later.
• Extraction methods include, for example, 1) a method in which tobacco raw materials are subjected to extraction using a medium to obtain a tobacco extract, 2) a method in which a medium is added to the tobacco raw materials, heating the materials, and collecting the vapor generated, and 3) a method in which the medium, which has been vaporized by heating, is passed through the tobacco raw materials and the vapor after passing is collected.
• method 1) water extraction is preferable from the viewpoint of workability, etc.
• solvent extraction is preferable from the viewpoint of work efficiency.
• An acid or alkali can also be used for extraction as necessary.
• the liquid obtained by extraction which contains tobacco extract E and the medium, is called tobacco extract liquid L.
• Tobacco raw materials can be, for example, Nicotiana tabacum or Nicotiana rustica.
• Nicotiana tabacum can be, for example, Burley or flue-cured varieties.
• Orient or native Burley varieties of the Nicotiana genus can also be used.
• the tobacco raw material may be shredded or powdered tobacco raw material (hereinafter also referred to as "raw material pieces").
• the particle size of the raw material pieces is preferably 0.5 to 1.18 mm.
• Such raw material pieces are obtained, for example, by sieving in accordance with JIS Z 8815 using a stainless steel sieve conforming to JIS Z 8801. For example, 1) using a stainless steel sieve with 1.18 mm openings, the raw material pieces are sieved for 20 minutes by a dry mechanical shaking method to obtain raw material pieces that pass through the stainless steel sieve with 1.18 mm openings.
• raw material pieces are sieved for 20 minutes by a dry mechanical shaking method to remove the raw material pieces that pass through the stainless steel sieve with 0.50 mm openings.
• the tobacco raw material is treated with an alkali. Flavor components are generated through this treatment, and are collected to prepare a tobacco extract liquid L containing tobacco extract E and water. In this case, it is preferable to extract the flavor components as a gas from the alkali-treated tobacco raw material, and introduce the gas into water to transfer the flavor components into a liquid.
• the alkaline substance is preferably an alkaline liquid such as an aqueous solution of potassium carbonate.
• the alkaline substance is supplied until the pH of the tobacco raw material falls within a specific range.
• the pH is preferably 8.0 or higher, more preferably 8.9 to 9.7.
• the pH of the tobacco raw material is the pH of the water when the tobacco raw material is mixed with 10 times the amount of water.
• the moisture content in the tobacco raw material is not limited, but from the viewpoint of efficient extraction of flavor components, it is preferable that the moisture content is about 5 to 30% by weight.
• the moisture content in the tobacco raw material is measured by a known method, for example, a 1 g sample is taken, heated at 105°C, and the weight loss amount when heated until the weight change rate is 1 mg/min or less is taken as the moisture content.
• a halogen heating moisture meter (Ohaus MB45, etc.) can be used for this measurement.
• the lower limit of the ratio of tobacco extract E dry matter weight/mixture dry matter weight is preferably 10% by weight or more, 15% by weight or more, or 20% by weight or more.
• the upper limit is preferably 60% by weight or less, 50% by weight or less, or 40% by weight or less.
• the ratio is preferably 20 to 50% by weight.
• the ratio is preferably 10 to 40% by weight.
• the amount of each component in the mixture on a dry basis is equal to the amount of each component in the sheet on a dry basis (dry matter weight of each component/dry matter weight of the sheet).
• Aerosol source examples include polyhydric alcohols such as glycerin or propylene glycol.
• the amount of moisture in the aerosol source is measured by a known method, for example, the same method as that for the amount of moisture in the tobacco raw material. If the amount of the aerosol source is too small, the amount of smoke during smoking is insufficient. If the amount is too large, the sheet becomes difficult to handle. From this perspective, the lower limit of the ratio of the aerosol source dry matter weight/mixture dry matter weight is preferably 5% by weight or more, 10% by weight or more, 20% by weight or more, or 40% by weight or more. The upper limit is preferably 70% by weight or less, 60% by weight or less, 50% by weight or less, or 40% by weight or less. In particular, in the case of an aerosol-rich type, the ratio is preferably 40 to 60% by weight. In addition, in the case of a tobacco-rich type, the ratio is preferably 10 to 40% by weight, more preferably 20 to 40% by weight.
• Non-wood fiber is a fiber not derived from wood, and is preferably a fiber other than tobacco fiber. Tobacco fiber is difficult to impart strength to the sheet, and may impart an unpleasant flavor.
• dietary fiber is preferable. Dietary fiber is a food component that is not digested by human digestive enzymes, and is more preferably insoluble dietary fiber that does not dissolve in water.
• the dietary fiber may be porous, i.e., spongy. Porous fiber can increase the surface area of the sheet for smoking articles and improve the thermal conductivity of the sheet. From the viewpoint of availability, the fiber is preferably citrus fiber. Citrus fiber is a fiber whose main raw material is the albedo of citrus fruits.
• the dietary fiber may be short fiber or columnar particles with a small aspect ratio.
• citrus fiber is preferable because it can impart strength to the sheet with a small amount of use.
• the moisture content in the non-wood fiber is measured by a known method, for example, it is measured by the same method as the moisture content in the tobacco raw material.
• the ratio of non-wood fiber dry matter weight/mixture dry matter weight is 10-40% by weight or 10-30% by weight.
• Wood fiber Wood fiber can be used as another component.
• wood fiber include coniferous pulp, Vitacel FL400, and Vitacel L600/30 (all manufactured by J. Rettenmaier & Sohne GmbH).
• the moisture content in the wood fiber is measured, and the blending amount of wood fiber is determined so as to satisfy the above-mentioned relationship.
• the moisture content in the wood fiber is measured by a known method, for example, by the same method as that for the moisture content in the tobacco raw material.
• the ratio of wood fiber dry weight/mixture dry weight is 1 to 10% by weight.
• the content of wood fiber is preferably less than the content of non-wood fiber.
• Binder A binder can be used as another component.
• binders include carboxyalkyl cellulose and guar gum.
• the moisture content in the binder is measured, and the amount of binder to be added is determined so as to satisfy the above relationship.
• the moisture content in the binder is measured by a known method, and can be measured, for example, by the same method as the moisture content of the tobacco raw material.
• the ratio of the binder dry weight/mixture dry weight is 1 to 10% by weight.
• Flavoring agent examples include menthol, but are not limited thereto and may be any of those described below.
• the amount of flavoring agent may be a known amount. These flavoring agents may be used alone or in combination of two or more.
• fragrances 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, ⁇ -carotene, carrot juice, L-carvone, ⁇ -carotene Lyophyllene, cassia bark oil, cedarwood oil, celery seed oil, chamomile oil, cinnamaldehyde, cinnamic acid, cinnamyl alcohol,
• the step (1) preferably includes the following steps (1-1) to (1-4).
• ⁇ Step (1-1)> the tobacco raw material is subjected to a preliminary extraction with water, and an extraction rate a defined by the following formula (1) is determined.
• Extraction rate a Ed (tobacco extract E dry weight) / Td (tobacco raw material dry weight) (1)
• the dry weight is the weight excluding water. Therefore, Ed (dry weight of tobacco extract E) is the dry weight of the tobacco extract liquid L obtained by extraction, that is, the weight of the tobacco extract liquid L excluding the weight of water.
• the extraction can be carried out by a known method.
• the extraction temperature is preferably 60 to 100°C, and more preferably 70 to 90°C from the viewpoint of smoking taste.
• the extraction time is preferably 20 to 40 minutes.
• a factor X relating to the weight of water to be used in a new extraction is determined based on formula (I).
• the liquid-solid ratio is determined so as to satisfy the above range.
• Liquid-solid ratio (X/a) x t + (Bw/Bd) x (1-t) (I)
• X is defined as Ew (weight of water in the tobacco extract L) / Td (weight of the dry matter of the tobacco raw material). In other words, X is the weight ratio of the water used for extraction to the weight of the dry matter of the tobacco raw material.
• Bw is the total weight of water in all components B in the mixture obtained in steps 1-4. All components B are all components other than the tobacco extract, including, for example, the aerosol source and fibers. Bd is the total dry weight of all components B in the mixture obtained in steps 1-4. Bw and Bd are determined by analyzing each component using a known method.
• t is the tobacco extract usage ratio, defined as Ed/(Ed+Bd). In other words, t is the "dry weight of tobacco extract E/dry weight of the mixture" in the mixture obtained in step 1-4.
• Step (1-3)> the tobacco raw material is extracted with water in an amount that satisfies the above-mentioned X to obtain a tobacco extract.
• the extraction conditions are the same as those of the pre-extraction.
• Step (1-4)> the tobacco extract obtained in step (1-3) is mixed with other components to prepare a mixture that satisfies formula (I), i.e., has a desired liquid-solid ratio R.
• the step (1) preferably includes the following steps (1-1') to (1-4').
• ⁇ Step (1-1′)> the tobacco raw material is subjected to pre-extraction with the mixed solvent, and an extraction rate a' defined by the following formula (1') is determined.
• Extraction rate a' Ed (tobacco extract E dry weight)/Td (tobacco raw material dry weight) (1')
• Ed dry weight of tobacco extract E is the weight of tobacco extract L' obtained by extraction minus the weights of water and alcohol. Extraction can be carried out as described for water extraction.
• a factor X relating to the weight of water in a mixed solvent to be used in a new extraction using the mixed solvent is determined based on formula (I').
• Liquid-solid ratio (X/a') x t + (Bw/Bd) x (1-t) (I')
• X is defined as Ew (weight of water in the tobacco extract L') / Td (weight of the dry matter of the tobacco raw material). In other words, X is the weight ratio of water used in the solvent extraction to the weight of the dry matter of the tobacco raw material.
• Bw is the total weight of water in all components B in the mixture obtained in step 1-4'.
• Bd is the total dry weight of all components B in the mixture obtained in step 1-4'.
• Bd includes the dry weight of the alcohol used in the solvent extraction.
• t is the ratio of tobacco extract used in the solvent extraction and is defined as Ed/(Ed+Bd).
• the formula (I') can be derived as follows, similarly to the above formula (I).
• the composition and amount of the mixed solvent to be used for the new extraction are determined from X. For example, if the weight ratio of water:alcohol in the mixed solvent used in the preliminary extraction is 1:z, the mixed solvent is prepared by mixing X water and X ⁇ z alcohol. Then, extraction is performed using the mixed solvent to obtain a tobacco extract.
• the extraction conditions are the same as those of the preliminary extraction.
• Step (1-4')> This step can be carried out in the same manner as in step (1-4).
• Step (2) Sheet Preparation Step
• a sheet is obtained from the mixture prepared in step (1).
• the sheet is produced by a known method, but the above effect is more pronounced in the casting method.
• the casting method in order to increase the solid content concentration in the mixture, it is necessary to concentrate the tobacco extract in the mixture.
• a mixture having an appropriate liquid-solid ratio is prepared, so that casting can be performed without concentration. Concentration usually involves heating or decompression. At this time, problems such as the removal of part of the flavor components in the extract or the deterioration of the flavor components occur. Depending on the flavor components, the device may be contaminated, and the deterioration of the flavor components may cause a decrease in the smoking taste. In addition, it is possible to recover the removed flavor components, but this would be a cumbersome operation. In this embodiment, these problems can be avoided.
• the mixture When obtaining a sheet without concentration, for example, the mixture is cast onto a substrate without going through a concentration step to form a wet sheet. The wet sheet is then dried to obtain a tobacco sheet.
• the drying temperature is preferably 50 to 100°C.
• a tobacco sheet obtained by the casting method is also called a "cast sheet".
• the mixture used in the casting method can be prepared by a known method, but it is preferable to prepare it by a method including the following steps.
• Step 1 Mixing tobacco extract with an aerosol source such as glycerin (if water is to be added, the water is also mixed at this time).
• Step 2 A step of mixing the binder into the mixture and continuing to mix until the binder is uniformly mixed.
• Step 3 A step of mixing other solids into the mixture obtained in step 2. If solids containing a binder are mixed together first, the binder will become "lumpy" and this state is difficult to resolve. In this method, the binder and the aerosol source are mixed first, so the binder is less likely to become "lumpy.”
• "Lumpy" refers to a state in which the component is not dispersed or dissolved and exists as a lump.
• Aerosol-generating sheet The aerosol-generating sheet obtained by the above-mentioned manufacturing method is useful as a filler for smoking articles.
• smoking articles include combustion-type smoking articles and non-combustion heating-type smoking articles.
• the aerosol-generating sheet obtained by the above-mentioned method can be made into a tobacco-rich type and an aerosol source-rich type as described above, so that it can meet various needs of consumers.
• a manufacturing method comprising:
• Aspect 4 A method according to any one of Aspects 1 to 3, wherein the aerosol-generating sheet contains 15 to 50% by weight of the tobacco extract, on a dry matter basis.
• Aspect 5 said other component B comprising an aerosol source;
• Aspect 6 The method according to any one of claims 1 to 5, wherein the other components include non-wood fibers, wood fibers, or a binder.
• Aspect 7 The method according to claim 6, wherein the non-wood fiber is a dietary fiber.
• Aspect 8 The method of claim 7, wherein the non-wood fiber is a citrus fiber.
• Aspect 9 A method according to any one of claims 6 to 8, wherein the binder is a carboxyalkyl cellulose or a guar gum.
• Aspect 10 A method according to any one of claims 6 to 9, wherein the content of wood fibers is less than the content of non-wood fibers.
• Example 1 Tobacco Extract Liquid Brazilian flue-cured tobacco was prepared as a tobacco raw material. 250 g of the tobacco raw material and 1,085 g of water were placed in a flask and stirred at 80° C. for about 60 minutes to perform extraction. (2) Mixture Other components used were wood pulp (softwood pulp), non-wood pulp (Helvacel AQ Plus CF-D/100, manufactured by DSP Gokyo Food & Chemical Co., Ltd.), aerosol source (glycerin), and binder (cellulose derivatives: CMCF30MC, CMC350HC, manufactured by Nippon Paper Industries Co., Ltd., and guar gum: GRINDSTED 175, manufactured by Dupont Danisco).
• wood pulp softwood pulp
• non-wood pulp Helvacel AQ Plus CF-D/100
• aerosol source glycerin
• binder cellulose derivatives: CMCF30MC, CMC350HC, manufactured by Nippon Paper Industries Co., Ltd.
• guar gum GRIND
• Sheets could be formed in all examples.
• the mixture (slurry) in Example 2 which had a liquid-solid ratio of 8, had a low viscosity, and although it was within an acceptable range, the workability was poor. Therefore, by using a binder that gave a slurry with a higher viscosity, the workability improved (Example 3).
• a sheet could be produced with excellent workability even at a liquid-solid ratio of 7 (Example 4).

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• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• General Chemical & Material Sciences (AREA)
• Manufacture Of Tobacco Products (AREA)

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Citations (4)

• 2023
  • 2023-03-06 EP EP23926206.6A patent/EP4678016A1/en active Pending
  • 2023-03-06 KR KR1020257032523A patent/KR20250152107A/ko active Pending
  • 2023-03-06 JP JP2025504926A patent/JPWO2024184992A1/ja active Pending
  • 2023-03-06 CN CN202380094972.9A patent/CN120693075A/zh active Pending
  • 2023-03-06 WO PCT/JP2023/008265 patent/WO2024184992A1/ja not_active Ceased

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