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
  • 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
  • A24B15/10—Chemical features of tobacco products or tobacco substitutes
  • A24B15/12—Chemical features of tobacco products or tobacco substitutes of reconstituted 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
  • 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
  • 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
  • A24B15/16—Chemical features of tobacco products or tobacco substitutes of tobacco substitutes
• • 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
  • A24B15/28—Treatment of tobacco products or tobacco substitutes by chemical substances
• • 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
  • A24B15/28—Treatment of tobacco products or tobacco substitutes by chemical substances
  • A24B15/30—Treatment of tobacco products or tobacco substitutes by chemical substances by organic substances

Definitions

• the present invention relates to a tobacco sheet, a method for producing a tobacco sheet, tobacco filler, and a smoking article.
• Synthetic tobacco a tobacco material that has been artificially shaped into paper form using leaf tobacco as a raw material, is also called a tobacco sheet.
• known methods for producing tobacco sheets include methods in which they are produced via a sheet-forming (paper making) process, methods in which they are produced via a slurry (casting) process, methods in which they are produced via a rolling (roll) process, and methods in which they are produced via an extrusion molding process.
• the particle size of the raw material tobacco should be within a predetermined range.
• PTL 1 discloses that, the smaller the tobacco particle size, the greater the surface area of the tobacco particles that are bonded together, which allows the strength of the tobacco sheet to be increased, and in particular discloses that ensuring a mesh of 60 to 400 (56 ⁇ m to 375 ⁇ m) will allow a homogeneous sheet to be created.
• tobacco powder having a particle size of 30 to 120 ⁇ m should be used because tobacco web strength is impaired when homogenized to a tobacco particle size of 150 ⁇ m or more.
• TTL 4 and 5 there are also techniques in which tobacco having a nano-scaled particle size is used as raw material for sheets.
• NPL 1 Flexible cellulose nanopaper with high wet tensile strength, high toughness and tunable ultraviolet blocking ability fabricated from tobacco stalk via a sustainable method
• Tobacco sheets having desired physical properties are produced by using tobacco particles having a small particle size, obtained as described above, which are bonded together with some kind of binder.
• the tobacco sheet produced in this manner is furthermore cut into a desired cut tobacco and then molded into, for example, a tobacco rod shape.
• water is added to the tobacco sheet to a predetermined moisture content before the tobacco is cut, for the sake of the strength and moisture stability of the molded tobacco rod.
• an object of the present invention is to provide a tobacco sheet having improved water resistance. Another object of the present invention is to provide a tobacco sheet that has a better sour-tasting flavor in addition to improved water resistance.
• the tobacco sheet of the present invention allows water resistance to be improved.
• the tobacco sheet of the present invention in some cases, has a better sour-tasting flavor in addition to improved water resistance.
• the tobacco sheet, method for producing a tobacco sheet, tobacco filler, and smoking article of the present invention are described below.
• the tobacco sheet of the present invention comprises a carboxyalkyl cellulose onium salt.
• the alkyl of the carboxyalkyl cellulose onium salt is not particularly limited, but is preferably a C1-3 alkyl, more preferably methyl, ethyl, or combination thereof, and ideally methyl.
• the onium salt of the carboxymethyl cellulose onium salt is not particularly limited, but an ammonium salt, phosphonium salt, oxonium salt, sulfonium salt, fluoronium salt, chloronium salt, bromonium salt, iodonium salt, or combinations of two or more thereof can be used. Of these, ammonium salts are preferred, and quaternary ammonium salts are more preferred.
• the carboxymethyl cellulose onium salt may comprise or consist of, but is not particularly limited to, a carboxymethyl cellulose ammonium salt, a carboxymethyl cellulose calcium salt, or a combination of two or more of these. Of these, carboxymethyl cellulose ammonium salts are preferred. The use of carboxymethyl cellulose ammonium salt will provide a sour-tasting flavor.
• the content of the carboxyalkyl cellulose onium salt in the tobacco sheet is not particularly limited, but is preferably 1% by weight or more, more preferably 1 to 15% by weight, and ideally 2 to 8% by weight. Ensuring that the content of the carboxyalkyl cellulose onium salt is within the above numerical range will allow a stronger sheet shape to be obtained.
• the tobacco sheet can further comprise an aerosol-generating agent.
• the type of aerosol-generating agent is not particularly limited, extracts from various types of natural products and/or components thereof may be selected depending on the purpose of use.
• the aerosol-generating agent can comprise or consist of: a polyhydric alcohol such as glycerol, propylene glycol, sorbitol, xylitol, and erythritol; triacetin; 1,3-butanediol; or mixtures of two or more thereof. Of these, glycerol is preferred. The use of glycerol can ensure consistent smoke volume.
• the content of the aerosol-generating agent in the tobacco sheet is not particularly limited, but is preferably 5 to 35% by weight, more preferably 7 to 25% by weight, and ideally 10 to 15% by weight. Ensuring that the aerosol-generating agent is within the above numerical range will allow more consistent smoke volume to be produced.
• the tobacco sheet can further comprise non-pulp fibers.
• Non-pulp fibers are fibers other than pulp fibers. Pulp fibers are aggregates of cellulose fibers taken from plants such as timber, and is usually used as raw material for paper. Examples of pulp fibers include recycled waste-paper pulp, chemical pulp, and mechanical pulp. In the present application, non-pulp fibers are preferably plant-derived. Plant-derived fibers are biodegradable and are thus less of an environmental burden.
• Tobacco materials such as conventional tobacco sheets are based on pulp fibers such as wood pulp, i.e., plant fiber bundles (see, for example, specification of US 5322076 ).
• Wood pulp is generally configured in the form of bundles of a plurality of single fibers having a fiber diameter of 20 ⁇ m, where the wood pulp has a diameter of about 100 to 200 ⁇ m and a length of about 1000 to 2000 ⁇ m.
• tobacco sheets having a tensile strength suitable for practical use are produced using wood pulp, the sheets end up being 100 to 300 ⁇ m thick, resulting in a loss of thermal conductivity.
• the use of non-pulp fibers in the present application allows thin sheets having better mechanical strength to be formed and better thermal conductivity to be achieved.
• the average fiber diameter of non-pulp fibers is preferably 25 ⁇ m or less, more preferably 20 ⁇ m or less, and even more preferably 15 ⁇ m or less.
• the lower limit of the average fiber diameter is not limited, but is 2 nm or more, 10 nm or more, 100 nm or more, 1 ⁇ m or more, or 5 ⁇ m or more.
• the average fiber diameter of non-pulp fibers can be determined by obtaining images of the fibers, determining the width (short axis) of a plurality of fibers, and averaging the values.
• the fiber width is defined as the width of the main surface, which is the longer of the main surface width and side surface width. At least 100 measurements are preferably taken.
• the non-pulp fibers are preferably single-fiber cellulose.
• Single-fiber cellulose means fine fibers that have been obtained via treatment of pulp fibers by a process such as fibrillation.
• the single-fiber cellulose may undergo chemical modification such as oxidation.
• the average fiber diameter of the monofiberized cellulose is as described above.
• the average fiber length of the single-fiber cellulose is not limited, but the upper limit is preferably 2000 ⁇ m or less, and more preferably 1500 ⁇ m or less.
• the lower limit is preferably 100 ⁇ m ore more, and more preferably 500 ⁇ m or more.
• the non-pulp fibers are also preferably dietary fiber.
• Dietary fiber is a food ingredient that that cannot be digested by human digestive enzymes and, in the present application, is more preferably water-insoluble dietary.
• Dietary fiber may be porous, i.e., sponge-like. Porous fiber can expand the surface area of sheets for smoking articles and can enhance the thermal conductivity of the sheets.
• the fiber is preferably citrus fiber.
• Citrus fiber is primarily composed of the mesocarp of citrus fruits. The average fiber diameter of the citrus fiber is as described above.
• Dietary fiber may also be short fiber or columnar particle that have a small aspect ratio.
• single-fiber cellulose and dietary fiber are used in combination. Using both will enhance tobacco sheet strength, water-dispersibility, and smoke intensity.
• the upper limit of the single-fiber cellulose weight is preferably 1.5 parts by weight or less, and more preferably 1.2 weight parts or less, whereas the lower limit is preferably 0.1 part by weight or more, and more preferably 0.3 part by weight or more, per 1 part by weight of dietary fiber.
• the content of the non-pulp fiber in the tobacco sheet is not particularly limited, but is preferably 30 to 50% by weight, more preferably 35 to 45% by weight, and ideally 37.5 to 40% by weight. Ensuring that the non-pulp fiber content is within the above numerical range will result in a suitable non-pulp fiber content and thus make it easier to preserve the shape of the sheet.
• the tobacco sheet can furthermore include, in addition to the components noted above, an antioxidant, inulin, reducing sugar, or a combination of two or more thereof. Of these, antioxidants are preferred. With the use of antioxidants, increases in TSNA (a component of concern) will be less likely to occur.
• a tobacco sheet can be obtained by molding a composition comprising aged tobacco leaf into the form of a sheet.
• aged tobacco leaf used in the tobacco sheet, but aged tobacco leaf which has been destemmed and separated into lamina and midrib may be cited, for example.
• sheet means a shape having a pair of substantially parallel main faces and side faces.
• tobacco sheets can be used in tobacco sheets. Examples include flue-cured, Burley, orient, or native varieties, as well as Nicotiana tabacum and Nicotiana rustica varieties. These varieties can also be used alone, but in order to obtain a desired flavor, any varieties over the course from the harvest of tobacco leaves to the processing of the various types in which aged tobacco leaf is used in heat-not-burn tobacco products (specifically, processed tobacco leaves) can also be blended for use.
• the tobacco sheet can be a cast sheet, a sheet made by a sheet-making process, or a rolled sheet.
• the tobacco sheet disintegrability is not particularly limited, but the disintegrability, as determined by a disintegrability test, is preferably 50 seconds or more, more preferably 55 to 600 seconds, and ideally 55 to 300 seconds.
• the tobacco sheet disintegrability, as determined by a disintegrability test can also be 600 seconds or less, or 600 seconds or more.
• the disintegrability, as determined by a disintegrability test indicates the water resistance of the tobacco sheet; the greater the disintegrability, the higher the water resistance of the tobacco sheet.
• the method disclosed in Japanese Patent Publication No. 60, 45914 is used as the method for determining disintegrability, as determined by a disintegrability test.
• the above disintegrability as determined by a disintegrability test, can be determined based on the procedure and method described in "1. Water Resistance" of the (Assessment Methods) in the [Examples] below.
• the disintegrability time is the total time of the operations for shaking the samples for 5 seconds and allowing the samples to stand for the 55 seconds.
• the disintegrability rating can be determined to be 600 seconds or more than 600 seconds, respectively.
• the moisture content of the tobacco sheet is not particularly limited, but is preferably 9 to 15% by weight, more preferably 10 to 14.5% by weight, and ideally 10 to 14% by weight. Ensuring that the moisture content of the tobacco sheet is within the above numerical range will result in little moisture variation despite any changes in environmental humidity.
• the moisture content of the tobacco sheet can be determined using an IR moisture analyzer.
• the method for producing a tobacco sheet in the present invention is the method for producing a tobacco sheet described in "1. Tobacco Sheet” note above, comprising a step in which the tobacco sheet is obtained by molding a tobacco leaf-containing composition.
• the method for molding the tobacco sheet is not particularly limited, but fine tobacco powder, nicotine, a flavor development aid, and a binder, for example, as well as an aerosol-generating agent and flavoring as needed, can be mixed, water can be added to the mixture to knead the materials, and the resulting kneaded product can be molded by a known method such as a sheet-forming method, casting method, or rolling method. Details on various types of tobacco sheets molded by such methods are disclosed in " Dictionary of Tobacco, Tobacco Academic Studies Center, March 31, 2009 ".
• the method for producing a tobacco sheet can include a step for heating the tobacco leaf-containing composition (drying step).
• the heating temperature in the step for heating the tobacco leaf-containing composition is not particularly limited, but is preferably 80°C or above, more preferably 100°C or above, and ideally 100 to 140°C.
• the heating time in the step for heating the tobacco leaf-containing composition is not particularly limited, but is preferably 10 minutes or more, more preferably 30 minutes or more, and ideally 30 to 60 minutes.
• the combination of 10 minutes or more at a temperature of 130°C or above, 60 minutes or more at a temperature of 80°C or above, 60 minutes or more at a temperature of 100°C or above, or 30 minutes or more at a temperature of 120°C or above can be used as the combination of heating temperature and time in the step for heating the tobacco leaf-containing composition. Ensuring that the heating temperature and time are within the numerical ranges above can be expected to result in sufficient moisture evaporation and will enhance the water resistance of the resulting tobacco sheet.
• the method for producing a tobacco sheet can further comprise a multi-stage drying step in which the drying in the drying step described above is divided into a plurality of stages.
• the temperature during the drying in multiple stages in the multi-stage drying step can be the same as the heating temperature in the above drying step.
• the total time during the drying in multiple stages in the multi-stage drying step can be the same as the heating time in the above drying step.
• the tobacco filler in the present invention comprises the tobacco sheet described in "1. Tobacco Sheet" above.
• the tobacco filler can consist of the tobacco sheet described in "1. Tobacco Sheet" above.
• Tobacco filler refers to processed tobacco leaves that are used in a predetermined form to fill an object that is being filled.
• the "object to be filled” is a part of a tobacco project that is filled with the processed tobacco leaf.
• objects to be filled include, but are not limited to, cylindrically rolled wrapping paper, and containers having an air inlet and outlet.
• Examples of embodiments in which objects to be filled are filled with processed tobacco include, but are not particularly limited to: embodiments in which filling is accomplished by wrapping the processed tobacco leaf inside wrapping paper (also referred to below as “tobacco rod”) or embodiments in which the air inlet and outlet of a container are filled with the processed tobacco leaf (also referred to below as “tobacco cartridge”).
• tobacco filler composed of a tobacco sheet used to fill an object to be filled can be used as the tobacco filler.
• the smoking article of the present invention comprises the tobacco filler described in "3. Tobacco Filler" above.
• the smoking article can be a heat-not-burn smoking article.
• smoking articles examples include flavor inhalation articles with which users taste flavors via inhalation, and smokeless cigarettes (smokeless smoking articles) with which users taste flavors, with the product held directly in the oral or nasal cavities.
• smoke inhalation articles can be broadly divided into combusted smoking articles, such as conventional cigarettes, and heat-not-burn smoking articles.
• Examples of combusted smoking articles include cigarettes, pipes, kiserus (Japanese smoking pipes), cigars, and cigarillos.
• Heat-not-burn smoking articles may be heated by a heating device that is separate from the article, or by a heating device that is integrated with the article.
• a heating device that is separate from the article
• the heat-not-burn smoking article and the heating device are collectively referred to as a "heat-not-burn smoking system.”
• An example of a heat-not-burn smoking system is described below with reference to Figs. 1 and 2 .
• Fig. 1 is a cross-sectional view of a heat-not-burn smoking article 20.
• the heat-not-burn smoking article 20 (referred to below simply as “smoking article 20") has a cylindrical shape.
• the 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.
• the smoking article 20 consists of a smoking segment 20A and a filter portion 20C constituting the mouthpiece, which are connected by a connecting portion 20B.
• the smoking segment 20A is cylindrical, the total length (axial length) of which is, for example, preferably 5 to 100 mm, more preferably 10 to 50 mm, and even more preferably 10 to 25 mm.
• the shape of the cross-section of the smoking segment 20A is not particularly limited, but can be circular, elliptical, or polygonal, for example.
• the smoking segment 20A has a smoking composition sheet 21 (or material derived therefrom), around which is wrapped a wrapper 22.
• the smoking composition sheet 21 (or material derived therefrom) may contain flavoring.
• the filter portion 20C is cylindrical.
• the filter portion 20C has a rod-shaped first segment 25 that is made by being filled with cellulose acetate fibers, and a rod-shaped second segment 26 that is similarly made by being 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 filling layer (cellulose acetate fibers) 25a and an inner plug wrapper 25b that is wrapped around the first filling layer 25a.
• the second segment 26 consists of a second filling layer (cellulose acetate fibers) 26a and an inner plug wrapper 26b that is wrapped around the second filling layer 26a.
• the first and second segments 25 and 26 are connected by an outer plug wrapper 27.
• the outer plug wrapper 27 is adhered to the first segment 25 and second segment 26 by a vinyl acetate
• the length of the filter portion 20C can be 10 to 30 mm, for example, the length of the connecting portion 20B can be 10 to 30 mm, for example, the length of the first segment 25 can be 5 to 15 mm, for example, and the length of the second segment 26 can be 5 to 15 mm, for example.
• the lengths of these individual segments are examples, and can be modified, as appropriate, depending on, for example, the manufacturability, the required quality, and the length of the smoking segment 20A.
• the first segment 25 (centre hole segment) is composed of the first filling layer 25a having one or more hollow portions, and the inner plug wrapper 25b that covers the first filling layer 25a.
• the first segment 25 has the function of increasing the strength of the second segment 26.
• the first filling layer 25a of the first segment 25 is, for example, densely filled with cellulose acetate fibers. To the cellulose acetate fibers are added and cured a triacetin-containing plasticizer, in an amount of 6 to 20% by mass, for example, relative to the mass of the cellulose acetate.
• the hollow portion of the first segment 25 may, for example, have an inner diameter of ⁇ 1.0 to ⁇ 5.0 mm.
• the first filling layer 25a of the first segment 25 may, for example, be configured with a relatively high fiber filling density, or may be the same as the fiber filling density of the second filling layer 26a of the second segment 26 described below.
• the first filling layer 25a of the first segment 25 may, for example, be configured with a relatively high fiber filling density, or may be the same as the fiber filling density of the second filling layer 26a of the second segment 26 described below.
• the length of the second segment 26 can be shortened, for example, to allow the first segment 25 to be lengthened accordingly.
• the first filling layer 25a of the first segment 25 is a fiber filled layer, and the user therefore will not feel any discomfort when touching the outside during use.
• the second segment 26 is composed of the second filling layer 26a and an inner plug wrapper 26b that covers the second filling layer 26a.
• the second segment 26 (filter segment) is filled with cellulose acetate fibers in a commonly used density, and has a commonly used aerosol filtration capacity.
• the filtration capacity for filtering the aerosol (mainstream smoke) released from the smoking segment 20A may differ between the first segment 25 and the second segment 26. At least one of the first segment 25 or the second segment 26 may comprise flavouring.
• the filter portion 20C may have any structure, and may be a structure having a plurality of segments as described above, or may be composed of a single segment. The filter portion 20C may be composed of one segment. In such cases, the filter portion 20C may be composed of either the first segment or the second segment.
• the connecting portion 20B is cylindrical.
• the connecting portion 20B has a paper tube 23 that is cylindrically formed using cardboard, for example.
• the connecting portion 20B may be filled with a cooling member for cooling the aerosol.
• cooling members includes a sheet of a polymer such as polylactic acid, which can be folded and filled.
• a support that prevents the position of the smoking segment 20A from moving around may furthermore be provided between the smoking segment 20A and the connecting portion 20B.
• the support can be composed of known materials such as a centre hole filter of the kind in the first segment 25.
• a wrapper 28 is cylindrically wrapped around the outside of the smoking segment 20A, connecting portion 20B, and filter portion 20C to integrally join these parts.
• One surface (the inner surface) of the wrapper 28 is coated with a vinyl acetate-emulsion-based adhesive, over the entire surface or substantially the entire surface, except near the ventilation holes 24.
• a plurality of ventilation holes 24 are externally formed by a laser process after the smoking segment 20A, connecting portion 20B, and filter portion 20C have been integrated by the wrapper 28.
• the ventilation holes 24 comprise two or more through-holes that pass through the connecting portion 20B in the thicknesswise direction.
• the two or more through-holes are formed so as to be radially arranged, as viewed along a line extending through the central axis of the smoking article 20.
• the ventilation holes 24 are provided in the connecting portion 20B, but may be provided in the filter portion 20C.
• the two or more through-holes of the ventilation holes 24 are provided in a single row at a constant interval in a circular pattern, but may be provided in two rows at a constant interval in a circular pattern, where the one or two rows of the ventilation holes 24 may be provided discontinuously or irregularly.
• FIG. 2 An example of a heat-not-burn smoking system is shown in Fig. 2 .
• the heat-not-burn smoking system comprises a heat-not-burn smoking article 20 and a heating device 10 which heats the smoking segment 20A from the outside.
• the heating device 10 comprises: a body 11, a heater 12, a metal tube 13, a battery unit 14, and a control unit 15.
• the body 11 has a tubular recess 16, where the heater 12 and metal tube 13 are disposed at positions facing the smoking segment 20A inserted therein.
• the heater 12 can be a heater employing electrical resistance, where heating by the heater 12 is effected by the supply of electrical power from the battery unit 14 per commands from the control unit 15, which controls the temperature. Heat emitted from the heater 12 is transferred through the highly thermoconductive metal tube 13 to the smoking segment 20A.
• the figure depicts an embodiment in which the heating device 10 heats the smoking segment 20A from the outside, but the segment may also be heated from the inside.
• the heating temperature of the heating device 10 is not particularly limited, but is preferably 400°C or below, more preferably 150 to 400°C, and even more preferably 200 to 350°C.
• the heating temperature refers to the temperature of the heater of the heating device 10.
• each tobacco sheet in its entirety consisted of 76% by weight tobacco raw material, 6% by weight binder, 12% by weight glycerol, and 6% by weight of pulp.
• Measurement samples were also produced using a 1 g sample of each of the resulting tobacco sheets, and the moisture content (% by weight) of each sheet was determined using an IR moisture analyzer (heat-drying moisture analyzer MX-50, by A&D Company, Ltd.).
• the moisture content (% by weight) of the various binders used to prepare the tobacco sheets, as well as the moisture of the tobacco sheets are shown in Table 1.
• Example 1 Carboxymethyl cellulose ammonium salt (DN-800H, by DAICEL MIRAIZU LTD.) 13.0 Comparative Example 1 Carboxyalkyl cellulose (SOLMIX CM-I; molecular weight: 400,000; by LBG Sicilia Ingredients) 13.3 Comparative Example 2 Hydroxypropyl (HP) potato starch (DELICA KH-D, by NIPPON STARCH CHEMICAL CO., LTD.) 12.7 Comparative Example 3 Pregelatinized waxy corn starch (Waxy Alpha Y, by Sanwa Starch Co., Ltd.) 12.5
• Example 1 and Comparative Examples 1 through 3 that had been prepared with one of the binders shown in Table 1 above was cut into the shape of a disk 30 mm in diameter to obtain samples.
• Three samples each were fully immersed in 30°C warm water in petri dishes, and the petri dishes containing the samples were shaken back and forth at a rate of 6 times per 5 seconds, and were then allowed to stand for 55 seconds.
• the operation of shaking the samples for 5 seconds and allowing the samples to stand for 55 seconds was repeated 10 times, and the water resistance was assessed based on the resulting differences in the disintegrability of each of the three samples.
• the tobacco sheets can be considered to be free of any problems in terms of quality, in which case the tobacco sheet disintegrability can be determined to be 600 seconds or more than 600 seconds, respectively.
• Smoking segments were produced by filling wrappers with the tobacco sheets of Examples 1 and Comparative Examples 1 through 3 above, and the heat-not-burn smoking article shown in Fig. 1 was prepared. Each of the resulting heat-not-burn smoking articles was then installed in the heat-not-burn smoking system shown in Fig. 2 .
• smoking articles thus prepared were assessed for sour-tasting flavor by ten well-trained panelists.
• "sour-tasting flavor” means a mildly acidic, piquant taste, with less off-flavor.
• the sour-tasting flavor of the test smoking articles was assessed by calculating the average of the ratings of the 10 panelists that were based on the 5 criteria in Table 3 below. In the criteria of Table 3 below, 3 means the rating was the same as in the Comparative Examples. Average values to the second decimal place were rounded off to the first decimal place to calculate the scores. The results of assessment are shown in Table 4.
• Example 4 The results in Table 4 showed that the tobacco sheet of Example 1, which included a carboxymethyl cellulose ammonium salt (a carboxyalkyl cellulose onium salt), had exceptional water resistance. The results also showed that the tobacco sheet of Example 1 also had an exceptional sour-tasting flavor in addition to exceptional water resistance.
• a carboxymethyl cellulose ammonium salt a carboxyalkyl cellulose onium salt

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• 2022
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