EP4223148A1 - Tobacco sheet - Google Patents
Tobacco sheet Download PDFInfo
- Publication number
- EP4223148A1 EP4223148A1 EP21875857.1A EP21875857A EP4223148A1 EP 4223148 A1 EP4223148 A1 EP 4223148A1 EP 21875857 A EP21875857 A EP 21875857A EP 4223148 A1 EP4223148 A1 EP 4223148A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- sheet
- tobacco
- segment
- weight
- mixture
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 235000002637 Nicotiana tabacum Nutrition 0.000 title claims abstract description 162
- 244000061176 Nicotiana tabacum Species 0.000 title description 14
- 241000208125 Nicotiana Species 0.000 claims abstract description 148
- 239000011230 binding agent Substances 0.000 claims abstract description 31
- 239000000463 material Substances 0.000 claims abstract description 28
- 230000003746 surface roughness Effects 0.000 claims abstract description 13
- 239000000203 mixture Substances 0.000 claims description 36
- 230000000391 smoking effect Effects 0.000 claims description 30
- 238000000034 method Methods 0.000 claims description 27
- 238000001035 drying Methods 0.000 claims description 14
- 239000000758 substrate Substances 0.000 claims description 12
- 238000004898 kneading Methods 0.000 claims description 10
- 238000005096 rolling process Methods 0.000 claims description 9
- 239000000796 flavoring agent Substances 0.000 description 41
- 235000019634 flavors Nutrition 0.000 description 41
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- 239000000843 powder Substances 0.000 description 27
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- 238000011049 filling Methods 0.000 description 18
- 238000010438 heat treatment Methods 0.000 description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 18
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- 239000002245 particle Substances 0.000 description 14
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- 239000000284 extract Substances 0.000 description 10
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- 239000000123 paper Substances 0.000 description 7
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- 241000984084 Helianthemum nummularium subsp. grandiflorum Species 0.000 description 6
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- XHXUANMFYXWVNG-ADEWGFFLSA-N (-)-Menthyl acetate Chemical compound CC(C)[C@@H]1CC[C@@H](C)C[C@H]1OC(C)=O XHXUANMFYXWVNG-ADEWGFFLSA-N 0.000 description 3
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- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 3
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- DOOTYTYQINUNNV-UHFFFAOYSA-N Triethyl citrate Chemical compound CCOC(=O)CC(O)(C(=O)OCC)CC(=O)OCC DOOTYTYQINUNNV-UHFFFAOYSA-N 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 3
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- 239000000047 product Substances 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- 239000001069 triethyl citrate Substances 0.000 description 3
- VMYFZRTXGLUXMZ-UHFFFAOYSA-N triethyl citrate Natural products CCOC(=O)C(O)(C(=O)OCC)C(=O)OCC VMYFZRTXGLUXMZ-UHFFFAOYSA-N 0.000 description 3
- 235000013769 triethyl citrate Nutrition 0.000 description 3
- OOCCDEMITAIZTP-QPJJXVBHSA-N (E)-cinnamyl alcohol Chemical compound OC\C=C\C1=CC=CC=C1 OOCCDEMITAIZTP-QPJJXVBHSA-N 0.000 description 2
- UFLHIIWVXFIJGU-ARJAWSKDSA-N (Z)-hex-3-en-1-ol Chemical compound CC\C=C/CCO UFLHIIWVXFIJGU-ARJAWSKDSA-N 0.000 description 2
- OXQOBQJCDNLAPO-UHFFFAOYSA-N 2,3-Dimethylpyrazine Chemical compound CC1=NC=CN=C1C OXQOBQJCDNLAPO-UHFFFAOYSA-N 0.000 description 2
- LCZUOKDVTBMCMX-UHFFFAOYSA-N 2,5-Dimethylpyrazine Chemical compound CC1=CN=C(C)C=N1 LCZUOKDVTBMCMX-UHFFFAOYSA-N 0.000 description 2
- 239000001934 2,5-dimethylpyrazine Substances 0.000 description 2
- AYJXHIDNNLJQDT-UHFFFAOYSA-N 2,6,6-Trimethyl-2-cyclohexene-1,4-dione Chemical compound CC1=CC(=O)CC(C)(C)C1=O AYJXHIDNNLJQDT-UHFFFAOYSA-N 0.000 description 2
- HJFZAYHYIWGLNL-UHFFFAOYSA-N 2,6-Dimethylpyrazine Chemical compound CC1=CN=CC(C)=N1 HJFZAYHYIWGLNL-UHFFFAOYSA-N 0.000 description 2
- MOMFXATYAINJML-UHFFFAOYSA-N 2-Acetylthiazole Chemical compound CC(=O)C1=NC=CS1 MOMFXATYAINJML-UHFFFAOYSA-N 0.000 description 2
- LNIMMWYNSBZESE-UHFFFAOYSA-N 2-Ethyl-3-methylpyrazine, 9CI Chemical compound CCC1=NC=CN=C1C LNIMMWYNSBZESE-UHFFFAOYSA-N 0.000 description 2
- DBZAKQWXICEWNW-UHFFFAOYSA-N 2-acetylpyrazine Chemical compound CC(=O)C1=CN=CC=N1 DBZAKQWXICEWNW-UHFFFAOYSA-N 0.000 description 2
- IGJQUJNPMOYEJY-UHFFFAOYSA-N 2-acetylpyrrole Chemical compound CC(=O)C1=CC=CN1 IGJQUJNPMOYEJY-UHFFFAOYSA-N 0.000 description 2
- WGAVDEVFJDQIMZ-UHFFFAOYSA-N 3,4-dimethyl-1,2-cyclopentanedione Chemical compound CC1CC(=O)C(=O)C1C WGAVDEVFJDQIMZ-UHFFFAOYSA-N 0.000 description 2
- XPCTZQVDEJYUGT-UHFFFAOYSA-N 3-hydroxy-2-methyl-4-pyrone Chemical compound CC=1OC=CC(=O)C=1O XPCTZQVDEJYUGT-UHFFFAOYSA-N 0.000 description 2
- IGIDLTISMCAULB-UHFFFAOYSA-N 3-methylvaleric acid Chemical compound CCC(C)CC(O)=O IGIDLTISMCAULB-UHFFFAOYSA-N 0.000 description 2
- GNKZMNRKLCTJAY-UHFFFAOYSA-N 4'-Methylacetophenone Chemical compound CC(=O)C1=CC=C(C)C=C1 GNKZMNRKLCTJAY-UHFFFAOYSA-N 0.000 description 2
- XCZPDOCRSYZOBI-UHFFFAOYSA-N 5,6,7,8-Tetrahydroquinoxaline Chemical compound C1=CN=C2CCCCC2=N1 XCZPDOCRSYZOBI-UHFFFAOYSA-N 0.000 description 2
- IUFQZPBIRYFPFD-UHFFFAOYSA-N 5-ethyl-3-hydroxy-4-methyl-2(5H)-furanone Chemical compound CCC1OC(=O)C(O)=C1C IUFQZPBIRYFPFD-UHFFFAOYSA-N 0.000 description 2
- OALYTRUKMRCXNH-UHFFFAOYSA-N 5-pentyloxolan-2-one Chemical compound CCCCCC1CCC(=O)O1 OALYTRUKMRCXNH-UHFFFAOYSA-N 0.000 description 2
- GHBSPIPJMLAMEP-UHFFFAOYSA-N 6-pentyloxan-2-one Chemical compound CCCCCC1CCCC(=O)O1 GHBSPIPJMLAMEP-UHFFFAOYSA-N 0.000 description 2
- KWOLFJPFCHCOCG-UHFFFAOYSA-N Acetophenone Chemical compound CC(=O)C1=CC=CC=C1 KWOLFJPFCHCOCG-UHFFFAOYSA-N 0.000 description 2
- FERIUCNNQQJTOY-UHFFFAOYSA-N Butyric acid Chemical compound CCCC(O)=O FERIUCNNQQJTOY-UHFFFAOYSA-N 0.000 description 2
- 235000013912 Ceratonia siliqua Nutrition 0.000 description 2
- 240000008886 Ceratonia siliqua Species 0.000 description 2
- QSJXEFYPDANLFS-UHFFFAOYSA-N Diacetyl Chemical compound CC(=O)C(C)=O QSJXEFYPDANLFS-UHFFFAOYSA-N 0.000 description 2
- VLSVVMPLPMNWBH-UHFFFAOYSA-N Dihydro-5-propyl-2(3H)-furanone Chemical compound CCCC1CCC(=O)O1 VLSVVMPLPMNWBH-UHFFFAOYSA-N 0.000 description 2
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- VUNOFAIHSALQQH-UHFFFAOYSA-N Ethyl menthane carboxamide Chemical compound CCNC(=O)C1CC(C)CCC1C(C)C VUNOFAIHSALQQH-UHFFFAOYSA-N 0.000 description 2
- 108010068370 Glutens Proteins 0.000 description 2
- 229920002907 Guar gum Polymers 0.000 description 2
- 235000019501 Lemon oil Nutrition 0.000 description 2
- CRZQGDNQQAALAY-UHFFFAOYSA-N Methyl benzeneacetate Chemical compound COC(=O)CC1=CC=CC=C1 CRZQGDNQQAALAY-UHFFFAOYSA-N 0.000 description 2
- 229920000881 Modified starch Polymers 0.000 description 2
- ZOZIRNMDEZKZHM-UHFFFAOYSA-N Phenethyl phenylacetate Chemical compound C=1C=CC=CC=1CCOC(=O)CC1=CC=CC=C1 ZOZIRNMDEZKZHM-UHFFFAOYSA-N 0.000 description 2
- LCTONWCANYUPML-UHFFFAOYSA-N Pyruvic acid Chemical compound CC(=O)C(O)=O LCTONWCANYUPML-UHFFFAOYSA-N 0.000 description 2
- 244000028419 Styrax benzoin Species 0.000 description 2
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- FINHMKGKINIASC-UHFFFAOYSA-N Tetramethylpyrazine Chemical compound CC1=NC(C)=C(C)N=C1C FINHMKGKINIASC-UHFFFAOYSA-N 0.000 description 2
- 244000269722 Thea sinensis Species 0.000 description 2
- 244000299461 Theobroma cacao Species 0.000 description 2
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- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 2
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- HUMNYLRZRPPJDN-UHFFFAOYSA-N benzaldehyde Chemical compound O=CC1=CC=CC=C1 HUMNYLRZRPPJDN-UHFFFAOYSA-N 0.000 description 2
- ISAOCJYIOMOJEB-UHFFFAOYSA-N benzoin Chemical compound C=1C=CC=CC=1C(O)C(=O)C1=CC=CC=C1 ISAOCJYIOMOJEB-UHFFFAOYSA-N 0.000 description 2
- SESFRYSPDFLNCH-UHFFFAOYSA-N benzyl benzoate Chemical compound C=1C=CC=CC=1C(=O)OCC1=CC=CC=C1 SESFRYSPDFLNCH-UHFFFAOYSA-N 0.000 description 2
- 238000009835 boiling Methods 0.000 description 2
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- 239000001605 (5-methyl-2-propan-2-ylcyclohexyl) acetate Substances 0.000 description 1
- KJPRLNWUNMBNBZ-QPJJXVBHSA-N (E)-cinnamaldehyde Chemical compound O=C\C=C\C1=CC=CC=C1 KJPRLNWUNMBNBZ-QPJJXVBHSA-N 0.000 description 1
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- WVDDGKGOMKODPV-ZQBYOMGUSA-N phenyl(114C)methanol Chemical compound O[14CH2]C1=CC=CC=C1 WVDDGKGOMKODPV-ZQBYOMGUSA-N 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
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- NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical compound [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 description 1
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- VQTLGLGPQXZERV-UHFFFAOYSA-M sodium;4-hydroxyundecanoate Chemical compound [Na+].CCCCCCCC(O)CCC([O-])=O VQTLGLGPQXZERV-UHFFFAOYSA-M 0.000 description 1
- UNYNVICDCJHOPO-UHFFFAOYSA-N sotolone Chemical compound CC1OC(=O)C(O)=C1C UNYNVICDCJHOPO-UHFFFAOYSA-N 0.000 description 1
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- 235000010491 tara gum Nutrition 0.000 description 1
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- PINIEAOMWQJGBW-FYZOBXCZSA-N tenofovir hydrate Chemical compound O.N1=CN=C2N(C[C@@H](C)OCP(O)(O)=O)C=NC2=C1N PINIEAOMWQJGBW-FYZOBXCZSA-N 0.000 description 1
- TUNFSRHWOTWDNC-HKGQFRNVSA-N tetradecanoic acid Chemical compound CCCCCCCCCCCCC[14C](O)=O TUNFSRHWOTWDNC-HKGQFRNVSA-N 0.000 description 1
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- 125000002088 tosyl group Chemical group [H]C1=C([H])C(=C([H])C([H])=C1C([H])([H])[H])S(*)(=O)=O 0.000 description 1
- RUVINXPYWBROJD-ONEGZZNKSA-N trans-anethole Chemical compound COC1=CC=C(\C=C\C)C=C1 RUVINXPYWBROJD-ONEGZZNKSA-N 0.000 description 1
- 239000001917 trigonella foenum graecum l. absolute Substances 0.000 description 1
- 125000002221 trityl group Chemical group [H]C1=C([H])C([H])=C([H])C([H])=C1C([*])(C1=C(C(=C(C(=C1[H])[H])[H])[H])[H])C1=C([H])C([H])=C([H])C([H])=C1[H] 0.000 description 1
- NQPDZGIKBAWPEJ-UHFFFAOYSA-N valeric acid Chemical compound CCCCC(O)=O NQPDZGIKBAWPEJ-UHFFFAOYSA-N 0.000 description 1
- MWOOGOJBHIARFG-UHFFFAOYSA-N vanillin Chemical compound COC1=CC(C=O)=CC=C1O MWOOGOJBHIARFG-UHFFFAOYSA-N 0.000 description 1
- FGQOOHJZONJGDT-UHFFFAOYSA-N vanillin Natural products COC1=CC(O)=CC(C=O)=C1 FGQOOHJZONJGDT-UHFFFAOYSA-N 0.000 description 1
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- 235000015112 vegetable and seed oil Nutrition 0.000 description 1
- 239000010679 vetiver oil Substances 0.000 description 1
- 239000001846 viola odorata l. leaf absolute Substances 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- KPQMCAKZRXOZLB-AATRIKPKSA-N vomifoliol Chemical compound CC(O)\C=C\C1(O)C(C)=CC(=O)CC1(C)C KPQMCAKZRXOZLB-AATRIKPKSA-N 0.000 description 1
- 238000001238 wet grinding Methods 0.000 description 1
- 239000012991 xanthate Substances 0.000 description 1
- UHVMMEOXYDMDKI-JKYCWFKZSA-L zinc;1-(5-cyanopyridin-2-yl)-3-[(1s,2s)-2-(6-fluoro-2-hydroxy-3-propanoylphenyl)cyclopropyl]urea;diacetate Chemical compound [Zn+2].CC([O-])=O.CC([O-])=O.CCC(=O)C1=CC=C(F)C([C@H]2[C@H](C2)NC(=O)NC=2N=CC(=CC=2)C#N)=C1O UHVMMEOXYDMDKI-JKYCWFKZSA-L 0.000 description 1
- OENHQHLEOONYIE-JLTXGRSLSA-N β-Carotene Chemical compound CC=1CCCC(C)(C)C=1\C=C\C(\C)=C\C=C\C(\C)=C\C=C\C=C(/C)\C=C\C=C(/C)\C=C\C1=C(C)CCCC1(C)C OENHQHLEOONYIE-JLTXGRSLSA-N 0.000 description 1
Images
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
- 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
- A24D—CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
- A24D1/00—Cigars; Cigarettes
- A24D1/20—Cigarettes specially adapted for simulated smoking devices
Definitions
- the present invention relates to a tobacco sheet.
- Patent Literature PTL 1 1
- a casting process is generally a process of obtaining a tobacco sheet by mixing necessary components to prepare a slurry, placing the slurry on a substrate, forming into a wet sheet (coating film) having a certain thickness by using a blade, and drying the wet sheet.
- a papermaking process is generally a process of producing a tobacco sheet through steps of extracting water-soluble components from tobacco leaves, separating into the resulting extract and residue, forming fibers by beating and defibrating the residue, forming into a sheet in the same manner as for making paper, drying the sheet, and adding the extract back to the dried sheet.
- a sheet produced through a papermaking process is formed from fibrous tobacco leaf residue and thus exhibits excellent strength but an unsatisfactory level of surface smoothness.
- a sheet produced through a casting process has surface air bubbles formed, for example, due to vapor generation during drying since a wet sheet rich in water is dried.
- the ends of a wet sheet become less dense through water evaporation and shrinking of the wet sheet, the sheet exhibits an unsatisfactory level of smoothness.
- fibers are added in these processes to ensure the strength, but such fibers tangle together to form a mass, thereby also impairing smoothness on sheet surfaces.
- tobacco sheets are used for smoking articles after processing, such as forming and cutting.
- the object of the present invention is to provide a tobacco sheet excellent in processability.
- the present inventors have found that a tobacco sheet having a specific surface roughness resolves the above-mentioned problems. In other words, the object is attained by the present invention below.
- a tobacco sheet is a sheet to be used for a smoking article and contains at least a tobacco material and a binder.
- a binder is an adhesive for binding a tobacco material together or for binding a tobacco material and other components.
- common binders may be used.
- binders include polysaccharides, such as guar gum and xanthan gum, and cellulose derivatives, such as CMC (carboxymethyl cellulose), CMC-Na (carboxymethyl cellulose sodium salt), and HPC (hydroxypropyl cellulose).
- the upper limit for the binder content is preferably 6 weight% or less on dry weight basis (weight after removing water contained, the same applies hereinafter) relative to the dry weight of a tobacco sheet.
- the lower limit is preferably 1 weight% or more and more preferably 3 weight% or more.
- Exemplary binders include polysaccharides, proteins, and synthetic polymers. Hereinafter, concrete examples of these binders will be described. In the present invention, these binders may also be used in combination.
- Organic acid esters cellulose acetate, cellulose formate, cellulose propionate, cellulose butyrate, cellulose benzoate, cellulose phthalate, tosyl cellulose
- Inorganic acid esters cellulose nitrate, cellulose sulfate, cellulose phosphate, cellulose xanthate
- Guar gum tara gum, locust bean gum, tamarind seed gum, pectin, gum arabic, gum tragacanth, gum karaya, gum ghatti, arabinogalactan, flaxseed gum, cassia gum, psyllium seed gum, artemisia seed gum
- Carrageenan agar, alginic acid, propylene glycol alginate, furcellaran, Gloiopelfis furcata extract
- Xanthan gum gellan gum, curdlan, pullulan, Agrobacterium succinoglycan, welan gum, Macrophomopsis gum, rhamsan gum
- Starch sodium starch glycolate, pregelatinized starch, dextrin
- Tobacco materials are materials derived from tobacco, and concrete examples include shreds of dry tobacco leaves and pulverized leaf tobacco.
- Pulverized leaf tobacco refers to particles obtained through pulverization of leaf tobacco. Such pulverized leaf tobacco may have the particle size D90 set to 20 to 1000 ⁇ m, for example, and preferably 50 to 500 ⁇ m. Moreover, the average particle size D50 may be set to preferably 20 to 1000 ⁇ m and more preferably 50 to 500 ⁇ m. Pulverization may be performed using a common grinding mill as dry grinding or wet grinding. The resulting pulverized leaf tobacco is thus referred to as leaf tobacco particles as well.
- the particle size is obtained by a laser diffraction/scattering method and is concretely measured using a laser diffraction particle size analyzer (LA-950 from Horiba, Ltd., for example).
- LA-950 laser diffraction particle size analyzer
- the type of tobacco is not limited, and flue-cured, burley, oriental, and domestic may be used, and others such as Nicotiana tabacum varieties or Nicotiana rustica varieties, for example, may be used.
- the amount of tobacco material in a tobacco sheet is not particularly limited but is preferably 50 to 95 weight% and more preferably 60 to 90 weight% on dry weight basis.
- a tobacco sheet may contain an aerosol former.
- An aerosol former is a material that generates an aerosol through vaporization upon heating and subsequent cooling or that generates an aerosol through atomization.
- a common aerosol former may be used, and examples include those having a boiling point above 100°C, such as polyhydric alcohols such as glycerol, propylene glycol (PG); triethyl citrate (TEC); and triacetin.
- the amount of aerosol former in a tobacco sheet is preferably 1 to 40 weight% and more preferably 10 to 20 weight% on dry weight basis (weight after removing water contained, the same applies hereinafter). When the amount of aerosol former exceeds the upper limit, the production of tobacco sheets could become difficult. Meanwhile, when the amount is less than the lower limit, smoky feeling could deteriorate.
- a tobacco sheet may contain an emulsifier.
- An emulsifier enhances affinity between an aerosol former, which is lipophilic, and a tobacco material, which is hydrophilic. For this reason, the addition of an emulsifier is effective particularly when a lipophilic aerosol former is used.
- Any common emulsifier may be used, and examples include emulsifiers having HLB of 8 to 18.
- the amount of emulsifier is not particularly limited but is preferably 0.1 to 3 parts by weight and more preferably 1 to 2 parts by weight on dry weight basis relative to 100 parts by weight of a tobacco sheet.
- a tobacco sheet of the present invention in an embodiment, does not contain fibers derived from tobacco or fibers derived from materials other than tobacco (cellulose, for example). In this embodiment, it is possible to avoid undesirable effects on smoking flavor, such as odd taste, exerted by these fibers. However, since completely excluding such fibers is not practical, the amount of these fibers in a tobacco sheet is preferably 1.0 weight% or less and more preferably 0.5 weight% or less on dry weight basis. Further, a tobacco sheet of the present invention, in another embodiment, contains 0.5 to 2.0 weight% in total of fibers derived from tobacco or fibers derived from materials other than tobacco. In this embodiment, these fibers enhance the strength of the tobacco sheet, resulting in excellent balance between smoking flavor and strength. In the present invention, fibers derived from tobacco indicate pulp formed through beating of a tobacco raw material using a grinder or the like and are thus different from the above-described tobacco materials.
- a tobacco sheet may contain a flavor.
- a flavor is a substance that provides aroma or taste. Such a flavor may be a natural flavor or a synthetic flavor. One flavor or a mixture of a plurality of flavors may be used. Any flavor commonly used for smoking articles may be used, and concrete examples will be described hereinafter.
- a flavor may be incorporated into a sheet for a smoking article in an amount such that the smoking article can provide preferable aroma or taste.
- the amount in a tobacco sheet is preferably 1 to 30 weight% and more preferably 2 to 20 weight%.
- exemplary flavors include, but are not particularly limited to, acetanisole, acetophenone, acetylpyrazine, 2-acetylthiazole, alfalfa extract, amyl alcohol, amyl butyrate, trans-anethole, star anise oil, apple juice, Peru balsam 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, ⁇ -caryophyllene, cassia bark oil, cedarwood oil, celery seed oil, chamomile oil, cinnamaldehyde, cin
- a tobacco sheet has Sa of 5 to 30 ⁇ m on at least one surface.
- Sa is an indicator of surface roughness.
- a tobacco sheet of the present invention when having Sa in this range, exhibits excellent processability and reduces detached shreds from the surface.
- Sa is more preferably 10 to 25 ⁇ m and further preferably 10 to 20 ⁇ m.
- a tobacco sheet of the present invention preferably has Sa in the above-mentioned range on both the surfaces. Sa is measured by a common method and is preferably measured using a microscope (VK-X 100 from Keyence Corporation, for example) through the following procedure of:
- the thickness of a tobacco sheet is not limited but is preferably 20 to 2000 ⁇ m, more preferably 100 to 1500 ⁇ m, and further preferably 100 to 1000 ⁇ m in an embodiment.
- a tobacco sheet has a tensile elongation of preferably 2.0% or more, more preferably 3.0% or more, and further preferably 5.0% or more.
- the upper limit for the tensile elongation is not limited but is typically about 15% or less.
- the tobacco sheet has a tensile stress of preferably 2.0 N/mm or more, more preferably 2.5 N/mm or more, and further preferably 3.0 N/mm or more.
- the smoothness of a tobacco sheet affects handling properties of a product.
- a smoking article using a tobacco sheet poor in smoothness could generate dust or so-called detached shreds during or after use, thereby causing trouble in handling, such as adhesion to clothing.
- a tobacco sheet of the present invention exhibits excellent smoothness and thus can suppress the occurrence of such trouble.
- a tobacco segment used for a smoking article can be produced from a tobacco sheet.
- the tobacco segment includes, in an embodiment, a tubular wrapper and a tobacco sheet spirally rolled and packed within the wrapper (see Fig. 1 (A) ).
- 20A is a tobacco segment
- 1 is a tobacco sheet
- 22 is a wrapper, which is typically paper.
- the tobacco segment preferably has a rod shape, and the length may be set to about 15 to 80 mm and the diameter to about 5 to 10 mm.
- the tobacco segment 20A in Fig. 1 (A) may also be cut to have an aspect ratio (length/diameter) of about 0.5 to 1.2 (see Fig. 1 (B) ).
- the tobacco segment 20A includes, in another embodiment, a tubular wrapper 22 and a tobacco sheet 1 folded and packed within the wrapper.
- the ridges formed through folding extend almost parallel to the longitudinal direction of the segment (see Fig. 1 (C) ).
- the tobacco segment 20A preferably has a rod shape, and the length may be set to about 15 to 80 mm and the diameter to about 5 to 10 mm.
- the tobacco sheet 1 has preferably been processed in advance by surface creasing, such as pleating or crimping.
- the tobacco segment 20A includes, in another embodiment, a tubular wrapper 22 and a cut piece 1c of a tobacco sheet, which is packed within the wrapper (see Fig. 1 (D) ).
- the tobacco segment 20A preferably has a rod shape, and the length may be set to about 15 to 80 mm and the diameter to about 5 to 10 mm.
- the size of a cut piece is not limited, but the length of the longest side may be set to about 2 to 20 mm and the width to about 0.5 to 1.5 mm, for example.
- the tobacco segment 20A includes, in another embodiment, a tubular wrapper 22 and strand-type shreds packed within the wrapper (see Fig. 1 (E) ).
- strand-type shreds are packed with the longitudinal direction almost parallel to the longitudinal direction of the wrapper 22.
- the width of a strand-type shred may be set to about 0.5 to 1.5 mm.
- the tobacco segment 20A includes, in another embodiment, a tubular wrapper 22 and tobacco shred filler randomly packed within the wrapper. Tobacco shreds are shredded products and thus differ from strand-type shreds.
- a tobacco sheet can be produced by any method but is preferably produced by a method including the following steps of:
- a sheet formed as above under applied pressure is referred to as "pressure-formed sheet,” and such "pressure-formed sheets” encompass a “laminate sheet” and an “extruded sheet” as described hereinafter.
- a laminate sheet is a sheet obtained by rolling a mixture once or more using a roller into a target thickness, followed by drying to a target water content.
- An extruded sheet is a sheet obtained by extruding a mixture from a T die or the like at a target thickness, followed by drying to a target water content.
- a pressure-formed sheet may be produced by rolling and extrusion in combination. For example, a mixture may be formed into a sheet through extrusion, further followed by rolling.
- a tobacco material, a binder, and a medium are kneaded.
- An aerosol former, an emulsifier, or a flavor may also be added as necessary.
- the amounts of the respective components to be added are adjusted to attain the above-mentioned amounts.
- the medium preferably primarily contains, for example, water or a water-soluble organic solvent having a boiling point below 100°C, such as ethanol, and is more preferably water or ethanol.
- This step can be performed by kneading the respective components but is preferably performed through 1) pulverization of a raw material (classified leaf tobacco, for example), 2) preparation of wet powder, and 3) kneading.
- a raw material is preferably coarsely crushed, followed by fine grinding using a grinding mill (ACM-5 from Hosokawa Micron Corporation, for example).
- the particle size D90 after fine grinding is preferably 20 to 1000 ⁇ m.
- the particle size is measured using a laser diffraction particle size analyzer, such as Mastersizer (from Malvern Panalytical Ltd.).
- the pulverized tobacco raw material (leaf tobacco particles, for example) is added with a binder and, as necessary, additives, such as a flavor and a lipid, and mixed. Since the mixing is preferably dry blending, a mixer is preferably used as a mixing apparatus. Subsequently, the resulting dry blend is added with water or another medium and, as necessary, glycerol or another aerosol former and mixed using a mixer to prepare wet powder (powder in the wet state).
- the amount of medium in the wet powder may be set to 20 to 80 weight% and preferably 20 to 40 weight% and is appropriately adjusted by step 2. For example, the amount of medium may be set to 20 to 50 weight% in the case of performing rolling in step 2 and to 20 to 80 weight% in the case of performing extrusion.
- the solid concentration of wet powder is preferably 50 to 90 weight%.
- the wet powder is kneaded using a kneader (DG-1 from Dalton Corporation, for example).
- DG-1 kneader
- the kneading is preferably performed until the medium permeates through the entire powder.
- kneading is preferably performed until a mixture becomes uniform in color under visual observation.
- a wet sheet is prepared by rolling the mixture (wet powder) or extruding the mixture from a die.
- the mixture is sandwiched between two substrate films and rolled into a predetermined thickness (over 100 ⁇ m) by passing through a pair of rollers using a calendaring machine (from Yuri Roll Machine Co., Ltd., for example), thereby obtaining a laminate in which a wet sheet exists between two substrate films.
- the substrate films are preferably non-adhesive films, such as fluoropolymer films. Such rolling using rollers may be performed a plurality of times.
- a wet sheet on a substrate by extruding the mixture (wet powder) from a die (preferably T die) provided with a predetermined gap.
- a die preferably T die
- a common material such as a glass sheet, a metal sheet, or a plastic sheet, may be used as the substrate.
- a common extruder can be used for extrusion.
- the wet sheet is dried.
- this step can be performed for a laminate through the following procedure. 1) Either substrate film is released. 2) The resulting laminate is dried using a circulation dryer. The drying temperature may be room temperature but is preferably 50°C to 100°C, and the drying time may be set to 1 to 2 minutes. 3) Subsequently, a tobacco sheet is obtained by releasing the other substrate film and further drying under the above-mentioned conditions. By performing drying like this, it is possible to avoid attachment of the tobacco sheet to other substrates. A tobacco sheet thus obtained is also referred to as "laminate sheet.” Such a laminate sheet is preferable since the sheet exhibits surface smoothness and can suppress generation of detached shreds when comes into contact with other members. Further, this method is suitable for the production of a sheet of 300 ⁇ m or less.
- extrusion the wet sheet on a substrate is dried with air or heating.
- the drying conditions are as mentioned above.
- a tobacco sheet thus obtained is also referred to as "extruded sheet.”
- extruded sheet Such an extruded sheet is preferable since the sheet exhibits surface smoothness and can suppress generation of detached shreds when comes into contact with other members. This method is suitable for the production of a sheet of 200 ⁇ m or more.
- Exemplary smoking articles include flavor inhaler articles, in which a user tastes a flavor through inhalation, and smokeless tobacco (smokeless smoking articles), in which a user places the product directly in the nasal or oral cavity to taste a flavor.
- Flavor inhaler articles are broadly divided into non-combustion smoking articles and combustion-type smoking articles represented by conventional cigarettes.
- a tobacco sheet of the present invention is suitable for flavor inhaler articles.
- Exemplary combustion-type flavor inhaler articles include cigarettes, pipes, kiseru or Japanese smoking pipes, cigars, and cigarillos.
- a heat-not-burn flavor inhaler article may be heated by a heating device separate from the article or may be heated by a heating device integrated with the article.
- a heating device separate from the article or may be heated by a heating device integrated with the article.
- a heat-not-burn flavor inhaler article and a heating device are also collectively referred to as "heat-not-burn smoking system.”
- an exemplary heat-not-burn smoking system will be described with reference to Figs. 2 and 3 .
- Fig. 2 is a schematic cross-sectional view of an exemplary heat-not-burn smoking system and illustrates the state before inserting a heater 12 into a tobacco segment 20A of a heat-not-burn flavor inhaler article 20. During use, the heater 12 is inserted into the tobacco segment 20A.
- Fig. 3 is a cross-sectional view of a heat-not-burn flavor inhaler article 20.
- the heat-not-burn smoking system includes a heat-not-burn flavor inhaler article 20 and a heating device 10 for heating the tobacco segment 20A from the inside.
- the heat-not-bum smoking system is not limited to the structure in Fig. 2 .
- the heating device 10 illustrated in Fig. 2 includes a body 11 and a heater 12.
- the body 11 may include a battery unit and a control unit.
- the heater 12 may be an electric resistance heater and is inserted into the tobacco segment 20A to heat the tobacco segment 20A.
- a tobacco sheet of the present invention is highly effective when the tobacco segment 20A is heated from the inside as illustrated in Fig. 2 .
- Such a heating mode has conventionally tended to generate detached shreds due to direct contact between a tobacco sheet and a heater. Meanwhile, a tobacco sheet of the present invention is less likely to generate detached shreds even in this case. For this reason, a tobacco sheet of the present invention is further effective in an internal heating mode.
- the embodiment of the heat-not-burn flavor inhaler article 20 is not limited to this. In another embodiment, the tobacco segment 20A is heated from the outside.
- the heating temperature by the heating device 10 is not particularly limited but is preferably 400°C or lower, more preferably 50°C to 400°C, and further preferably 150°C to 350°C.
- the heating temperature means the temperature of the heater 12 in the heating device 10.
- the heat-not-burn flavor inhaler article 20 (hereinafter, simply referred to as "flavor inhaler article 20") has a cylindrical shape.
- the flavor inhaler article 20 has a circumferential length of preferably 16 mm to 27 mm, more preferably 20 mm to 26 mm, and further preferably 21 mm to 25 mm.
- the entire length (length in the horizontal direction) of the flavor inhaler article 20 is not particularly limited but is preferably 40 mm to 90 mm, more preferably 50 mm to 75 mm, and further preferably 50 mm to 60 mm.
- the flavor inhaler article 20 comprises a tobacco segment 20A, a filter section 20C that forms a mouthpiece, and a connection section 20B that connects the tobacco segment 20A and the filter section 20C.
- the tobacco segment 20A is cylindrical.
- the entire length (length in the axial direction) is, for example, preferably 5 to 100 mm, more preferably 10 to 50 mm, and further preferably 10 to 25 mm.
- the cross-sectional shape of the tobacco segment 20A is not particularly limited but may be circular, elliptic, or polygonal, for example.
- the tobacco segment 20A includes a tobacco sheet or a material derived therefrom 21 and a wrapper 22 wrapped therearound.
- the wrapper 22 may be a tobacco sheet 1 of the present invention.
- the filter section 20C is cylindrical.
- the filter section 20C includes a rod-shaped first segment 25 filled with cellulose acetate fibers and a rod-shaped second segment 26 similarly filled with cellulose acetate fibers.
- the first segment 25 is positioned on the side of the tobacco segment 20A.
- the first segment 25 may have a hollow portion.
- the second segment 26 is positioned on the mouth side.
- the second segment 26 is solid.
- the first segment 25 comprises a first filling layer (cellulose acetate fibers) 25a and an inner plug wrapper 25b wrapped around the first filling layer 25a.
- the second segment 26 comprises a second filling layer (cellulose acetate fibers) 26a and an inner plug wrapper 26b wrapped around the second filling layer 26a.
- the first segment 25 and the second segment 26 are joined by an outer plug wrapper 27.
- the outer plug wrapper 27 is bonded to the first segment 25 and the second segment 26 using a vinyl acetate emulsion adhesive, for example.
- the length of the filter section 20C may be set to 10 to 30 mm, for example, the length of the connection section 20B to 10 to 30 mm, for example, the length of the first segment 25 to 5 to 15 mm, for example, and the length of the second segment 26 to 5 to 15 mm, for example.
- the lengths of these individual segments are examples and may be changed appropriately depending on production feasibility, required quality, the length of the tobacco segment 20A, and so forth.
- the first segment 25 (center hole segment) comprises a first filling layer 25a having one or more hollow portions and an inner plug wrapper 25b that covers the first filling layer 25a.
- the first segment 25 acts to enhance the strength of the second segment 26.
- the first filling layer 25a of the first segment 25 is, for example, cellulose acetate fibers packed at high density.
- the cellulose acetate fibers are, for example, added with 6 to 20 weight%, based on the weight of cellulose acetate, of a plasticizer including triacetin and hardened.
- the hollow portion of the first segment 25 has an inner diameter of ⁇ 1.0 to ⁇ 5.0 mm, for example.
- the first filling layer 25a of the first segment 25 may be formed, for example, at a relatively high filling density of fibers or at a filling density of fibers comparable to the second filling layer 26a of the second segment 26 described hereinafter. Consequently, air and an aerosol flow only through the hollow portion and hardly flow within the first filling layer 25a during inhalation. For example, when it is desirable to suppress reduction in aerosol components through filtration in the second segment 26, it is also possible to shorten the second segment 26 and extend the first segment 25 by the corresponding length.
- Replacing the shortened second segment 26 by the first segment 25 is effective for increasing the amount of aerosol components to be delivered. Since the first filling layer 25a of the first segment 25 is a fiber filling layer, the touch from the outside during use does not cause any discomfort to a user.
- the second segment 26 comprises a 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 at common density and thus exhibits typical filtration performance of aerosol components.
- the first segment 25 and the second segment 26 may be different in filtration performance of an aerosol (mainstream smoke) released from the tobacco segment 20A. Further, at least either of the first segment 25 and the second segment 26 may contain a flavor.
- the structure of the filter section 20C is optional and may be a structure having a plurality of segments as mentioned above or a structure of a single segment. In the case in which the filter section 20C is formed from one segment, the filter section 20C may comprise either the first segment or the second segment.
- connection section 20B is cylindrical.
- the connection section 20B includes a cylindrically formed paper tube 23 of cardboard, for example.
- the connection section 20B may be filled with a cooling member for cooling an aerosol.
- Exemplary cooling members include a polymer sheet of polylactic acid, for example, and such a sheet may be folded and packed therein. Further, a support may be provided between the tobacco segment 20A and the connection section 20B for suppressing the displacement of the tobacco segment 20A. Such a support may be formed of a common material, such as a center hole filter like the first segment 25.
- a wrapper 28 is cylindrically wrapped around the tobacco segment 20A, the connection section 20B, and the filter section 20C to join these components integrally. On either side (inner side) of the wrapper 28, almost the whole surface or the whole surface excluding near a ventilation hole portion 24 is coated with a vinyl acetate emulsion adhesive. A plurality of ventilation hole portions 24 are formed by laser processing from the outside after the tobacco segment 20A, the connection section 20B, and the filter section 20C are integrated by the wrapper 28.
- the ventilation hole portion 24 includes two or more penetrating holes in the thickness direction of the connection section 20B. Two or more penetrating holes are formed in radial arrangement when viewed from the extension of the central axis of the flavor inhaler article 20.
- the ventilation hole portion 24 is provided on the connection section 20B in this embodiment but may be provided on the filter section 20C.
- two or more penetrating holes of the ventilation hole portion 24 are provided aligning in one row or on one ring at certain intervals in this embodiment but may be provided aligning in two rows or on two rings at certain intervals. Further, the ventilation hole portion 24 in one or two rows may be provided aligning discontinuously or irregularly. When a user inhales with the mouthpiece in the mouth, external air is taken into mainstream smoke through the ventilation hole portion 24. Nevertheless, the ventilation hole portion 24 need not necessarily be provided.
- Tobacco leaves were pulverized to attain D90 of 204 ⁇ m and D50 of 66 ⁇ m using a grinding mill (ACM-5 from Hosokawa Micron Corporation), thereby yielding leaf tobacco particles.
- the D90 and D50 were measured using Mastersizer (from Malvern Panalytical Ltd.).
- the leaf tobacco particles and Sunrose F20HC cellulose ether from Nippon Paper Industries Co., Ltd.
- the resulting dry blend was added with glycerol as an aerosol former and water as a medium and mixed using a mixer to prepare wet powder.
- the composition of the respective components is as shown in Table 1-1.
- the wet powder was kneaded six times at room temperature using a kneader (DG-1 from Dalton Corporation) to yield a mixture.
- DG-1 kneader
- a T die was used as a die, and the screw rotation speed was set to 38.5 rpm.
- the wet powder was sandwiched between two Teflon TM films (Nitoflon ® No. 900UL from Nitto Denko Corporation) and rolled at four stages using a calendaring machine (from Yuri Roll Machine Co., Ltd.) to attain a predetermined thickness (over 100 ⁇ m), thereby preparing a 105 ⁇ m-thick laminate having a layered structure of film/wet sheet/film.
- the roll gaps for the first to the fourth stages were respectively set to 650 ⁇ m, 330 ⁇ m, 180 ⁇ m, and 5 ⁇ m.
- the roll gap for the fourth stage is smaller than the thickness of the finally obtained sheet. This is because the sheet released from the pressure between the rollers expanded near the final thickness.
- the laminate after releasing one Teflon TM film therefrom, was dried at 80°C for 1 to 2 minutes using a circulation dryer. Subsequently, a wet sheet after releasing the other film was dried under the same conditions to produce a tobacco sheet of the present invention, and the tobacco sheet was evaluated.
- Table 1-1 Composition in Example 1 Pulverized tobacco leaves Glycerol Binder Water Feed weight proportion [WB weight%] 65 11 2 22 Water content of each component [weight%] 10 13 5.4 100 Feed weight proportion [DB weight%] (proportion in finished sheet composition) 83 14 3 - Weight in wet powder [g] 180.7 31.54 6.2 61.5 Weight proportion in wet powder [WB weight%] 64.5 11.3 2.2 22.0 DB: dry-based WB: wet-based
- weight in wet powder represents the dry weight for the pulverized tobacco leaves, glycerol, and the binder and represents for water the total amount of the feed weight and the weight of water contained in the pulverized tobacco leaves, glycerol, and the binder.
- Tobacco sheets were produced and evaluated in the same manner as Example 1 except for respectively using, as a binder, Sunrose F30MC and Sunrose F20LC in place of Sunrose F20HC (cellulose ether from Nippon Paper Industries Co., Ltd.).
- a tobacco sheet was produced and evaluated in the same manner as Example 1 except for using, as a binder, Sunrose F30MC in place of Sunrose F20HC (cellulose ether from Nippon Paper Industries Co., Ltd.) and changing the amount of the binder to the amount shown in Table 3 and the amount of glycerol to 15.5 DB weight% as the feed weight proportion.
- Leaf tobacco particles having D90 of 204 ⁇ m and D50 of 66 ⁇ m were obtained in the same manner as Example 1.
- the same components as Example 1 and pulp were mixed using a mixer to yield a mixture.
- a tobacco sheet was produced using the resulting mixture by a common casting process.
- a tobacco sheet was produced by a common papermaking process, specifically, by: extracting, with water, water-soluble components of a tobacco raw material; mixing the resulting extraction residue, pulp, and water; beating the resulting mixture using a grinder; forming into a sheet using a papermaking machine; drying the sheet; and adding the extract and glycerol to the sheet.
- the resulting tobacco sheet was evaluated by the same methods as Example 1.
- the composition of the sheet is shown in Table 2. Further, the evaluation results of the tobacco sheets produced in the examples above are shown in Table 3.
- FIG. 2 An internal-heating non-combustion smoking system illustrated in Fig. 2 was prepared.
- the tobacco sheet produced in each example was cut into shreds.
- the shreds were packed within a wrapper 22 of 12 mm in length and 7 mm in diameter at 70 volume% to prepare a tobacco segment 20A.
- the system was subjected to a smoking test (14 puffs, CIR conditions, constant heating at 350°C) using a smoking machine. After the smoking test, the shreds were removed gently from the tobacco segment 20A. Subsequently, new shreds were packed within the wrapper 22 again at 70 volume%, and the system was subjected to the second smoking test.
- the smoking test was repeated in the same manner 20 times in total, and the total volume of detached shreds remained within the wrapper 22 was measured.
- the surface roughness was measured using a microscope (VK-X 100 from Keyence Corporation) through the following procedure of:
- the obtained sheet was cut into 15 mm in width ⁇ 180 mm in length, and the tensile strength was assessed as tensile stress by measuring using a tensile strength tester (Strograph E-S from Toyo Seiki Seisaku-sho, Ltd.) under conditions of load range: 25 and speed range: 50.
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Abstract
A tobacco sheet containing a tobacco material and a binder and having an arithmetic average surface roughness Sa of 5 to 30 µm on at least one surface.
Description
- The present invention relates to a tobacco sheet.
- There have been proposed numerous techniques concerning non-combustion smoking articles for inhaling a flavor component generated through heating of a tobacco sheet (Patent Literature (PTL) 1, for example). As a method of producing a tobacco sheet, a casting process (also referred to as slurry process) and a papermaking process are known. A casting process is generally a process of obtaining a tobacco sheet by mixing necessary components to prepare a slurry, placing the slurry on a substrate, forming into a wet sheet (coating film) having a certain thickness by using a blade, and drying the wet sheet. Meanwhile, a papermaking process is generally a process of producing a tobacco sheet through steps of extracting water-soluble components from tobacco leaves, separating into the resulting extract and residue, forming fibers by beating and defibrating the residue, forming into a sheet in the same manner as for making paper, drying the sheet, and adding the extract back to the dried sheet.
- PTL 1:
Japanese Patent No. 5292410 - A sheet produced through a papermaking process is formed from fibrous tobacco leaf residue and thus exhibits excellent strength but an unsatisfactory level of surface smoothness. Meanwhile, a sheet produced through a casting process has surface air bubbles formed, for example, due to vapor generation during drying since a wet sheet rich in water is dried. Moreover, also because the ends of a wet sheet become less dense through water evaporation and shrinking of the wet sheet, the sheet exhibits an unsatisfactory level of smoothness. Further, fibers are added in these processes to ensure the strength, but such fibers tangle together to form a mass, thereby also impairing smoothness on sheet surfaces. Typically, tobacco sheets are used for smoking articles after processing, such as forming and cutting. During such processing, a tobacco sheet having unsatisfactory surface smoothness used to cause problems, such as breakage, when the sheet comes into contact with a processing apparatus. In view of the above, the object of the present invention is to provide a tobacco sheet excellent in processability.
- The present inventors have found that a tobacco sheet having a specific surface roughness resolves the above-mentioned problems. In other words, the object is attained by the present invention below.
- (1) A tobacco sheet containing a tobacco material and a binder and having an arithmetic average surface roughness Sa of 5 to 30 µm on at least one surface.
- (2) The sheet according to (1), being a pressure-formed sheet.
- (3) The sheet according to (1) or (2), where the amount of the binder added is 6 weight% or less on dry weight basis relative to the dry weight of the tobacco sheet.
- (4) The tobacco sheet according to (1), having an arithmetic average surface roughness Sa of 5 to 30 µm on both the surfaces.
- (5) The sheet according to any of (1) to (4), having a tensile elongation of 5 to 15%.
- (6) A heat-not-burn smoking article including the tobacco sheet according to any of (1) to (5) or a material derived therefrom.
- (7) A method of producing the sheet according to any of (1) to (5), including:
-
step 1 of preparing a mixture by kneading at least a tobacco material, a binder, and a medium; - step 2 of preparing a wet sheet by rolling the mixture or extruding the mixture from a die; and
- step 3 of drying the wet sheet.
-
- (8) The method according to (7), where the step 2 includes preparing a laminate sheet in which a wet sheet exists between two substrate films.
- (9) The method according to (7) or (8), where the
step 1 includes kneading at least a tobacco material, a binder, and a medium in a single-screw or a multi-screw kneader. - (10) The method according to any of (7) to (9), where the mixture contains 20 to 80 weight% of a medium relative to the total amount of the mixture.
- According to the present invention, it is possible to provide a tobacco sheet excellent in processability.
-
-
Fig. 1 is a schematic view of exemplary tobacco segments using a tobacco sheet. -
Fig. 2 is a schematic cross-sectional view of an exemplary heat-not-burn smoking system. -
Fig. 3 is a schematic cross-sectional view of an exemplary heat-not-burn flavor inhaler article. - Hereinafter, the present invention will be described in detail. In the present invention, the expression of "X to Y" includes the lower and the upper limits of X and Y.
- A tobacco sheet is a sheet to be used for a smoking article and contains at least a tobacco material and a binder.
- A binder is an adhesive for binding a tobacco material together or for binding a tobacco material and other components. In the present invention, common binders may be used. Examples of such binders include polysaccharides, such as guar gum and xanthan gum, and cellulose derivatives, such as CMC (carboxymethyl cellulose), CMC-Na (carboxymethyl cellulose sodium salt), and HPC (hydroxypropyl cellulose). The upper limit for the binder content is preferably 6 weight% or less on dry weight basis (weight after removing water contained, the same applies hereinafter) relative to the dry weight of a tobacco sheet. Meanwhile, the lower limit is preferably 1 weight% or more and more preferably 3 weight% or more. When the amount of binder exceeds the upper limit or is less than the lower limit, the above-mentioned effects could not be exerted satisfactorily.
- Exemplary binders include polysaccharides, proteins, and synthetic polymers. Hereinafter, concrete examples of these binders will be described. In the present invention, these binders may also be used in combination.
- Methyl cellulose, ethyl cellulose, hydroxyethyl cellulose, hydroxymethyl ethyl cellulose, hydroxypropyl cellulose, hydroxypropyl methyl cellulose, benzyl cellulose, trityl cellulose, cyanoethyl cellulose, carboxymethyl cellulose, carboxyethyl cellulose, aminoethyl cellulose
- Organic acid esters: cellulose acetate, cellulose formate, cellulose propionate, cellulose butyrate, cellulose benzoate, cellulose phthalate, tosyl cellulose
- Inorganic acid esters: cellulose nitrate, cellulose sulfate, cellulose phosphate, cellulose xanthate
- Guar gum, tara gum, locust bean gum, tamarind seed gum, pectin, gum arabic, gum tragacanth, gum karaya, gum ghatti, arabinogalactan, flaxseed gum, cassia gum, psyllium seed gum, artemisia seed gum
- Carrageenan, agar, alginic acid, propylene glycol alginate, furcellaran, Gloiopelfis furcata extract
- Xanthan gum, gellan gum, curdlan, pullulan, Agrobacterium succinoglycan, welan gum, Macrophomopsis gum, rhamsan gum
- Chitin, chitosan, glucosamine
- Starch, sodium starch glycolate, pregelatinized starch, dextrin
- Wheat gluten, rye gluten
- Polyphosphoric acid, sodium polyacrylate, polyvinylpyrrolidone
- Tobacco materials are materials derived from tobacco, and concrete examples include shreds of dry tobacco leaves and pulverized leaf tobacco. Pulverized leaf tobacco refers to particles obtained through pulverization of leaf tobacco. Such pulverized leaf tobacco may have the particle size D90 set to 20 to 1000 µm, for example, and preferably 50 to 500 µm. Moreover, the average particle size D50 may be set to preferably 20 to 1000 µm and more preferably 50 to 500 µm. Pulverization may be performed using a common grinding mill as dry grinding or wet grinding. The resulting pulverized leaf tobacco is thus referred to as leaf tobacco particles as well. In the present invention, the particle size is obtained by a laser diffraction/scattering method and is concretely measured using a laser diffraction particle size analyzer (LA-950 from Horiba, Ltd., for example). Further, the type of tobacco is not limited, and flue-cured, burley, oriental, and domestic may be used, and others such as Nicotiana tabacum varieties or Nicotiana rustica varieties, for example, may be used. The amount of tobacco material in a tobacco sheet is not particularly limited but is preferably 50 to 95 weight% and more preferably 60 to 90 weight% on dry weight basis.
- A tobacco sheet may contain an aerosol former. An aerosol former is a material that generates an aerosol through vaporization upon heating and subsequent cooling or that generates an aerosol through atomization. A common aerosol former may be used, and examples include those having a boiling point above 100°C, such as polyhydric alcohols such as glycerol, propylene glycol (PG); triethyl citrate (TEC); and triacetin. The amount of aerosol former in a tobacco sheet is preferably 1 to 40 weight% and more preferably 10 to 20 weight% on dry weight basis (weight after removing water contained, the same applies hereinafter). When the amount of aerosol former exceeds the upper limit, the production of tobacco sheets could become difficult. Meanwhile, when the amount is less than the lower limit, smoky feeling could deteriorate.
- A tobacco sheet may contain an emulsifier. An emulsifier enhances affinity between an aerosol former, which is lipophilic, and a tobacco material, which is hydrophilic. For this reason, the addition of an emulsifier is effective particularly when a lipophilic aerosol former is used. Any common emulsifier may be used, and examples include emulsifiers having HLB of 8 to 18. The amount of emulsifier is not particularly limited but is preferably 0.1 to 3 parts by weight and more preferably 1 to 2 parts by weight on dry weight basis relative to 100 parts by weight of a tobacco sheet.
- A tobacco sheet of the present invention, in an embodiment, does not contain fibers derived from tobacco or fibers derived from materials other than tobacco (cellulose, for example). In this embodiment, it is possible to avoid undesirable effects on smoking flavor, such as odd taste, exerted by these fibers. However, since completely excluding such fibers is not practical, the amount of these fibers in a tobacco sheet is preferably 1.0 weight% or less and more preferably 0.5 weight% or less on dry weight basis. Further, a tobacco sheet of the present invention, in another embodiment, contains 0.5 to 2.0 weight% in total of fibers derived from tobacco or fibers derived from materials other than tobacco. In this embodiment, these fibers enhance the strength of the tobacco sheet, resulting in excellent balance between smoking flavor and strength. In the present invention, fibers derived from tobacco indicate pulp formed through beating of a tobacco raw material using a grinder or the like and are thus different from the above-described tobacco materials.
- A tobacco sheet may contain a flavor. A flavor is a substance that provides aroma or taste. Such a flavor may be a natural flavor or a synthetic flavor. One flavor or a mixture of a plurality of flavors may be used. Any flavor commonly used for smoking articles may be used, and concrete examples will be described hereinafter. A flavor may be incorporated into a sheet for a smoking article in an amount such that the smoking article can provide preferable aroma or taste. For example, the amount in a tobacco sheet is preferably 1 to 30 weight% and more preferably 2 to 20 weight%.
- From a viewpoint of imparting satisfactorily perceived flavor, exemplary flavors include, but are not particularly limited to, acetanisole, acetophenone, acetylpyrazine, 2-acetylthiazole, alfalfa extract, amyl alcohol, amyl butyrate, trans-anethole, star anise oil, apple juice, Peru balsam oil, beeswax absolute, benzaldehyde, benzoin resinoid, benzyl alcohol, benzyl benzoate, benzyl phenylacetate, benzyl propionate, 2,3-butanedione, 2-butanol, butyl butyrate, butyric acid, caramel, cardamom oil, carob absolute, β-carotene, carrot juice, L-carvone, β-caryophyllene, cassia bark oil, cedarwood oil, celery seed oil, chamomile oil, cinnamaldehyde, cinnamic acid, cinnamyl alcohol, cinnamyl cinnamate, citronella oil, DL-citronellol, clary sage extract, cocoa, coffee, cognac oil, coriander oil, cuminaldehyde, davana oil, δ-decalactone, γ-decalactone, decanoic acid, dill oil, 3,4-dimethyl-1,2-cyclopentanedione, 4,5-dimethyl-3-hydroxy-2,5-dihydrofuran-2-one, 3,7-dimethyl-6-octenoic acid, 2,3-dimethylpyrazine, 2,5-dimethylpyrazine, 2,6-dimethylpyrazine, ethyl 2-methylbutyrate, ethyl acetate, ethyl butyrate, ethyl hexanoate, ethyl isovalerate, ethyl lactate, ethyl laurate, ethyl levulinate, ethyl maltol, ethyl octanoate, ethyl oleate, ethyl palmitate, ethyl phenylacetate, ethyl propionate, ethyl stearate, ethyl valerate, ethyl vanillin, ethyl vanillin glucoside, 2-ethyl-3,(5 or 6)-dimethylpyrazine, 5-ethyl-3-hydroxy-4-methyl-2(5H)-furanone, 2-ethyl-3-methylpyrazine, eucalyptol, fenugreek absolute, genet absolute, gentian root infusion, geraniol, geranyl acetate, grape juice, guaiacol, guava extract, γ-heptalactone, γ-hexalactone, hexanoic acid, cis-3-hexen-1-ol, hexyl acetate, hexyl alcohol, hexyl phenylacetate, honey, 4-hydroxy-3-pentenoic acid γ-lactone, 4-hydroxy-4-(3-hydroxy-1-butenyl)-3,5,5-trimethyl-2-cyclohexen-1-one, 4-(p-hydroxyphenyl)-2-butanone, 4-hydroxyundecanoic acid sodium salt, immortelle absolute, β-ionone, isoamyl acetate, isoamyl butyrate, isoamyl phenylacetate, isobutyl acetate, isobutyl phenylacetate, jasmine absolute, kola nut tincture, labdanum oil, terpeneless lemon oil, licorice extract, linalool, linalyl acetate, lovage root oil, maltol, maple syrup, menthol, menthone, L-menthyl acetate, p-methoxybenzaldehyde, methyl 2-pyrrolyl ketone, methyl anthranilate, methyl phenylacetate, methyl salicylate, 4'-methylacetophenone, methyl cyclopentenolone, 3-methylvaleric acid, mimosa absolute, molasses, myristic acid, nerol, nerolidol, γ-nonalactone, nutmeg oil, δ-octalactone, octanal, octanoic acid, orange flower oil, orange oil, oris root oil, palmitic acid, ω-pentadecalactone, peppermint oil, petitgrain Paraguay oil, phenethyl alcohol, phenethyl phenylacetate, phenylacetic acid, piperonal, plum extract, propenylguaethol, propyl acetate, 3-propylidenephthalide, prune juice, pyruvic acid, raisin extract, rose oil, rum, sage oil, sandalwood oil, spearmint oil, styrax absolute, marigold oil, tea distillate, α-terpineol, terpinyl acetate, 5,6,7,8-tetrahydroquinoxaline, 1,5,5,9-tetramethyl-13-oxatricyclo[8.3.0.0.(4.9)]tridecane, 2,3,5,6-tetramethylpyrazine, thyme oil, tomato extract, 2-tridecanone, triethyl citrate, 4-(2,6,6-trimethylcyclohex-1-enyl)but-2-en-4-one, 2,6,6-trimethylcyclohex-2-ene-1,4-dione, 4-(2,6,6-trimethylcyclohexa-1,3-dienyl)but-2-en-4-one, 2,3,5-trimethylpyrazine, γ-undecalactone, γ-valerolactone, vanilla extract, vanillin, veratraldehyde, violet leaf absolute, N-ethyl-p-menthane-3-carboxamide (WS-3), ethyl 2-(p-menthane-3-carboxamido)acetate (WS-5), sugars (sucrose, fructose, and so forth), cocoa powder, carob powder, coriander powder, licorice powder, orange peel powder, rose hip powder, chamomile flower powder, lemon verbena powder, peppermint powder, leaf powder, spearmint powder, black tea powder, natural plant flavors (jasmine oil, lemon oil, vetiver oil, lovage oil, for example), esters (menthyl acetate, isoamyl propionate, for example), and alcohols (phenethyl alcohol, cis-6-nonen-1-ol, for example). These flavors may be used alone or in combination of two or more.
- A tobacco sheet has Sa of 5 to 30 µm on at least one surface. Sa is an indicator of surface roughness. A tobacco sheet of the present invention, when having Sa in this range, exhibits excellent processability and reduces detached shreds from the surface. In view of this, Sa is more preferably 10 to 25 µm and further preferably 10 to 20 µm. A tobacco sheet of the present invention preferably has Sa in the above-mentioned range on both the surfaces. Sa is measured by a common method and is preferably measured using a microscope (VK-X 100 from Keyence Corporation, for example) through the following procedure of:
- 1) setting the focus position of the lowest portion in a sheet;
- 2) setting the focus position of the highest portion in the sheet;
- 3) dividing the section obtained in 1) and 2) and imaging therethrough while gradually shifting the focus;
- 4) measuring a height from the difference between the focus position of each portion and the focus position of the lowest portion; and
- 5) calculating the roughness from the height data at each position (by automatic calculation using measuring apparatus software, as necessary) to calculate the arithmetic average surface roughness Sa.
- The thickness of a tobacco sheet is not limited but is preferably 20 to 2000 µm, more preferably 100 to 1500 µm, and further preferably 100 to 1000 µm in an embodiment.
- A tobacco sheet has a tensile elongation of preferably 2.0% or more, more preferably 3.0% or more, and further preferably 5.0% or more. The upper limit for the tensile elongation is not limited but is typically about 15% or less. Moreover, the tobacco sheet has a tensile stress of preferably 2.0 N/mm or more, more preferably 2.5 N/mm or more, and further preferably 3.0 N/mm or more.
- The smoothness of a tobacco sheet affects handling properties of a product. For example, a smoking article using a tobacco sheet poor in smoothness could generate dust or so-called detached shreds during or after use, thereby causing trouble in handling, such as adhesion to clothing. However, a tobacco sheet of the present invention exhibits excellent smoothness and thus can suppress the occurrence of such trouble.
- A tobacco segment used for a smoking article can be produced from a tobacco sheet. The tobacco segment includes, in an embodiment, a tubular wrapper and a tobacco sheet spirally rolled and packed within the wrapper (see
Fig. 1 (A) ). In the figure, 20A is a tobacco segment, 1 is a tobacco sheet, and 22 is a wrapper, which is typically paper. The tobacco segment preferably has a rod shape, and the length may be set to about 15 to 80 mm and the diameter to about 5 to 10 mm. Further, thetobacco segment 20A inFig. 1 (A) may also be cut to have an aspect ratio (length/diameter) of about 0.5 to 1.2 (seeFig. 1 (B) ). - The
tobacco segment 20A includes, in another embodiment, atubular wrapper 22 and atobacco sheet 1 folded and packed within the wrapper. The ridges formed through folding extend almost parallel to the longitudinal direction of the segment (seeFig. 1 (C) ). Thetobacco segment 20A preferably has a rod shape, and the length may be set to about 15 to 80 mm and the diameter to about 5 to 10 mm. In this embodiment, thetobacco sheet 1 has preferably been processed in advance by surface creasing, such as pleating or crimping. - The
tobacco segment 20A includes, in another embodiment, atubular wrapper 22 and acut piece 1c of a tobacco sheet, which is packed within the wrapper (seeFig. 1 (D) ). Thetobacco segment 20A preferably has a rod shape, and the length may be set to about 15 to 80 mm and the diameter to about 5 to 10 mm. The size of a cut piece is not limited, but the length of the longest side may be set to about 2 to 20 mm and the width to about 0.5 to 1.5 mm, for example. - The
tobacco segment 20A includes, in another embodiment, atubular wrapper 22 and strand-type shreds packed within the wrapper (seeFig. 1 (E) ). Such strand-type shreds are packed with the longitudinal direction almost parallel to the longitudinal direction of thewrapper 22. The width of a strand-type shred may be set to about 0.5 to 1.5 mm. - The
tobacco segment 20A includes, in another embodiment, atubular wrapper 22 and tobacco shred filler randomly packed within the wrapper. Tobacco shreds are shredded products and thus differ from strand-type shreds. - A tobacco sheet can be produced by any method but is preferably produced by a method including the following steps of:
-
step 1 of preparing a mixture by kneading at least a tobacco material, a binder, and a medium; - step 2 of preparing a wet sheet by rolling the mixture or extruding the mixture from a die; and
- step 3 of drying the wet sheet.
- A sheet formed as above under applied pressure is referred to as "pressure-formed sheet," and such "pressure-formed sheets" encompass a "laminate sheet" and an "extruded sheet" as described hereinafter. A laminate sheet is a sheet obtained by rolling a mixture once or more using a roller into a target thickness, followed by drying to a target water content. An extruded sheet is a sheet obtained by extruding a mixture from a T die or the like at a target thickness, followed by drying to a target water content. A pressure-formed sheet may be produced by rolling and extrusion in combination. For example, a mixture may be formed into a sheet through extrusion, further followed by rolling.
- In this step, a tobacco material, a binder, and a medium are kneaded. An aerosol former, an emulsifier, or a flavor may also be added as necessary. The amounts of the respective components to be added are adjusted to attain the above-mentioned amounts. The medium preferably primarily contains, for example, water or a water-soluble organic solvent having a boiling point below 100°C, such as ethanol, and is more preferably water or ethanol.
- This step can be performed by kneading the respective components but is preferably performed through 1) pulverization of a raw material (classified leaf tobacco, for example), 2) preparation of wet powder, and 3) kneading.
- A raw material is preferably coarsely crushed, followed by fine grinding using a grinding mill (ACM-5 from Hosokawa Micron Corporation, for example). The particle size D90 after fine grinding is preferably 20 to 1000 µm. The particle size is measured using a laser diffraction particle size analyzer, such as Mastersizer (from Malvern Panalytical Ltd.).
- The pulverized tobacco raw material (leaf tobacco particles, for example) is added with a binder and, as necessary, additives, such as a flavor and a lipid, and mixed. Since the mixing is preferably dry blending, a mixer is preferably used as a mixing apparatus. Subsequently, the resulting dry blend is added with water or another medium and, as necessary, glycerol or another aerosol former and mixed using a mixer to prepare wet powder (powder in the wet state). The amount of medium in the wet powder may be set to 20 to 80 weight% and preferably 20 to 40 weight% and is appropriately adjusted by step 2. For example, the amount of medium may be set to 20 to 50 weight% in the case of performing rolling in step 2 and to 20 to 80 weight% in the case of performing extrusion. The solid concentration of wet powder is preferably 50 to 90 weight%.
- The wet powder is kneaded using a kneader (DG-1 from Dalton Corporation, for example). The kneading is preferably performed until the medium permeates through the entire powder. For example, kneading is preferably performed until a mixture becomes uniform in color under visual observation.
- In this step, a wet sheet is prepared by rolling the mixture (wet powder) or extruding the mixture from a die. For example, the mixture is sandwiched between two substrate films and rolled into a predetermined thickness (over 100 µm) by passing through a pair of rollers using a calendaring machine (from Yuri Roll Machine Co., Ltd., for example), thereby obtaining a laminate in which a wet sheet exists between two substrate films. The substrate films are preferably non-adhesive films, such as fluoropolymer films. Such rolling using rollers may be performed a plurality of times. Further, it is also possible to form a wet sheet on a substrate by extruding the mixture (wet powder) from a die (preferably T die) provided with a predetermined gap. A common material, such as a glass sheet, a metal sheet, or a plastic sheet, may be used as the substrate. A common extruder can be used for extrusion.
- In this step, the wet sheet is dried. For example, this step can be performed for a laminate through the following procedure. 1) Either substrate film is released. 2) The resulting laminate is dried using a circulation dryer. The drying temperature may be room temperature but is preferably 50°C to 100°C, and the drying time may be set to 1 to 2 minutes. 3) Subsequently, a tobacco sheet is obtained by releasing the other substrate film and further drying under the above-mentioned conditions. By performing drying like this, it is possible to avoid attachment of the tobacco sheet to other substrates. A tobacco sheet thus obtained is also referred to as "laminate sheet." Such a laminate sheet is preferable since the sheet exhibits surface smoothness and can suppress generation of detached shreds when comes into contact with other members. Further, this method is suitable for the production of a sheet of 300 µm or less.
- In the case of extrusion, the wet sheet on a substrate is dried with air or heating. The drying conditions are as mentioned above. A tobacco sheet thus obtained is also referred to as "extruded sheet." Such an extruded sheet is preferable since the sheet exhibits surface smoothness and can suppress generation of detached shreds when comes into contact with other members. This method is suitable for the production of a sheet of 200 µm or more.
- Exemplary smoking articles include flavor inhaler articles, in which a user tastes a flavor through inhalation, and smokeless tobacco (smokeless smoking articles), in which a user places the product directly in the nasal or oral cavity to taste a flavor. Flavor inhaler articles are broadly divided into non-combustion smoking articles and combustion-type smoking articles represented by conventional cigarettes. A tobacco sheet of the present invention is suitable for flavor inhaler articles.
- Exemplary combustion-type flavor inhaler articles include cigarettes, pipes, kiseru or Japanese smoking pipes, cigars, and cigarillos.
- A heat-not-burn flavor inhaler article may be heated by a heating device separate from the article or may be heated by a heating device integrated with the article. In the former flavor inhaler article (separate-type), a heat-not-burn flavor inhaler article and a heating device are also collectively referred to as "heat-not-burn smoking system." Hereinafter, an exemplary heat-not-burn smoking system will be described with reference to
Figs. 2 and 3 . -
Fig. 2 is a schematic cross-sectional view of an exemplary heat-not-burn smoking system and illustrates the state before inserting aheater 12 into atobacco segment 20A of a heat-not-burnflavor inhaler article 20. During use, theheater 12 is inserted into thetobacco segment 20A.Fig. 3 is a cross-sectional view of a heat-not-burnflavor inhaler article 20. - As illustrated in
Fig. 2 , the heat-not-burn smoking system includes a heat-not-burnflavor inhaler article 20 and aheating device 10 for heating thetobacco segment 20A from the inside. However, the heat-not-bum smoking system is not limited to the structure inFig. 2 . - The
heating device 10 illustrated inFig. 2 includes abody 11 and aheater 12. Although not illustrated, thebody 11 may include a battery unit and a control unit. Theheater 12 may be an electric resistance heater and is inserted into thetobacco segment 20A to heat thetobacco segment 20A. - A tobacco sheet of the present invention is highly effective when the
tobacco segment 20A is heated from the inside as illustrated inFig. 2 . Such a heating mode has conventionally tended to generate detached shreds due to direct contact between a tobacco sheet and a heater. Meanwhile, a tobacco sheet of the present invention is less likely to generate detached shreds even in this case. For this reason, a tobacco sheet of the present invention is further effective in an internal heating mode. However, the embodiment of the heat-not-burnflavor inhaler article 20 is not limited to this. In another embodiment, thetobacco segment 20A is heated from the outside. - The heating temperature by the
heating device 10 is not particularly limited but is preferably 400°C or lower, more preferably 50°C to 400°C, and further preferably 150°C to 350°C. Herein, the heating temperature means the temperature of theheater 12 in theheating device 10. - As illustrated in
Fig. 3 , the heat-not-burn flavor inhaler article 20 (hereinafter, simply referred to as "flavor inhaler article 20") has a cylindrical shape. Theflavor inhaler article 20 has a circumferential length of preferably 16 mm to 27 mm, more preferably 20 mm to 26 mm, and further preferably 21 mm to 25 mm. The entire length (length in the horizontal direction) of theflavor inhaler article 20 is not particularly limited but is preferably 40 mm to 90 mm, more preferably 50 mm to 75 mm, and further preferably 50 mm to 60 mm. - The
flavor inhaler article 20 comprises atobacco segment 20A, afilter section 20C that forms a mouthpiece, and aconnection section 20B that connects thetobacco segment 20A and thefilter section 20C. - The
tobacco segment 20A is cylindrical. The entire length (length in the axial direction) is, for example, preferably 5 to 100 mm, more preferably 10 to 50 mm, and further preferably 10 to 25 mm. The cross-sectional shape of thetobacco segment 20A is not particularly limited but may be circular, elliptic, or polygonal, for example. - The
tobacco segment 20A includes a tobacco sheet or a material derived therefrom 21 and awrapper 22 wrapped therearound. Thewrapper 22 may be atobacco sheet 1 of the present invention. - The
filter section 20C is cylindrical. Thefilter section 20C includes a rod-shapedfirst segment 25 filled with cellulose acetate fibers and a rod-shapedsecond segment 26 similarly filled with cellulose acetate fibers. Thefirst segment 25 is positioned on the side of thetobacco segment 20A. Thefirst segment 25 may have a hollow portion. Thesecond segment 26 is positioned on the mouth side. Thesecond segment 26 is solid. Thefirst segment 25 comprises a first filling layer (cellulose acetate fibers) 25a and aninner plug wrapper 25b wrapped around thefirst filling layer 25a. Thesecond segment 26 comprises a second filling layer (cellulose acetate fibers) 26a and aninner plug wrapper 26b wrapped around thesecond filling layer 26a. Thefirst segment 25 and thesecond segment 26 are joined by anouter plug wrapper 27. Theouter plug wrapper 27 is bonded to thefirst segment 25 and thesecond segment 26 using a vinyl acetate emulsion adhesive, for example. - The length of the
filter section 20C may be set to 10 to 30 mm, for example, the length of theconnection section 20B to 10 to 30 mm, for example, the length of thefirst segment 25 to 5 to 15 mm, for example, and the length of thesecond segment 26 to 5 to 15 mm, for example. The lengths of these individual segments are examples and may be changed appropriately depending on production feasibility, required quality, the length of thetobacco segment 20A, and so forth. - For example, the first segment 25 (center hole segment) comprises a
first filling layer 25a having one or more hollow portions and aninner plug wrapper 25b that covers thefirst filling layer 25a. Thefirst segment 25 acts to enhance the strength of thesecond segment 26. Thefirst filling layer 25a of thefirst segment 25 is, for example, cellulose acetate fibers packed at high density. The cellulose acetate fibers are, for example, added with 6 to 20 weight%, based on the weight of cellulose acetate, of a plasticizer including triacetin and hardened. The hollow portion of thefirst segment 25 has an inner diameter of ø1.0 to ø5.0 mm, for example. - The
first filling layer 25a of thefirst segment 25 may be formed, for example, at a relatively high filling density of fibers or at a filling density of fibers comparable to thesecond filling layer 26a of thesecond segment 26 described hereinafter. Consequently, air and an aerosol flow only through the hollow portion and hardly flow within thefirst filling layer 25a during inhalation. For example, when it is desirable to suppress reduction in aerosol components through filtration in thesecond segment 26, it is also possible to shorten thesecond segment 26 and extend thefirst segment 25 by the corresponding length. - Replacing the shortened
second segment 26 by thefirst segment 25 is effective for increasing the amount of aerosol components to be delivered. Since thefirst filling layer 25a of thefirst segment 25 is a fiber filling layer, the touch from the outside during use does not cause any discomfort to a user. - The
second segment 26 comprises asecond filling layer 26a and aninner plug wrapper 26b that covers thesecond filling layer 26a. The second segment 26 (filter segment) is filled with cellulose acetate fibers at common density and thus exhibits typical filtration performance of aerosol components. - The
first segment 25 and thesecond segment 26 may be different in filtration performance of an aerosol (mainstream smoke) released from thetobacco segment 20A. Further, at least either of thefirst segment 25 and thesecond segment 26 may contain a flavor. The structure of thefilter section 20C is optional and may be a structure having a plurality of segments as mentioned above or a structure of a single segment. In the case in which thefilter section 20C is formed from one segment, thefilter section 20C may comprise either the first segment or the second segment. - The
connection section 20B is cylindrical. Theconnection section 20B includes a cylindrically formedpaper tube 23 of cardboard, for example. Theconnection section 20B may be filled with a cooling member for cooling an aerosol. - Exemplary cooling members include a polymer sheet of polylactic acid, for example, and such a sheet may be folded and packed therein. Further, a support may be provided between the
tobacco segment 20A and theconnection section 20B for suppressing the displacement of thetobacco segment 20A. Such a support may be formed of a common material, such as a center hole filter like thefirst segment 25. - A
wrapper 28 is cylindrically wrapped around thetobacco segment 20A, theconnection section 20B, and thefilter section 20C to join these components integrally. On either side (inner side) of thewrapper 28, almost the whole surface or the whole surface excluding near aventilation hole portion 24 is coated with a vinyl acetate emulsion adhesive. A plurality ofventilation hole portions 24 are formed by laser processing from the outside after thetobacco segment 20A, theconnection section 20B, and thefilter section 20C are integrated by thewrapper 28. - The
ventilation hole portion 24 includes two or more penetrating holes in the thickness direction of theconnection section 20B. Two or more penetrating holes are formed in radial arrangement when viewed from the extension of the central axis of theflavor inhaler article 20. Theventilation hole portion 24 is provided on theconnection section 20B in this embodiment but may be provided on thefilter section 20C. Moreover, two or more penetrating holes of theventilation hole portion 24 are provided aligning in one row or on one ring at certain intervals in this embodiment but may be provided aligning in two rows or on two rings at certain intervals. Further, theventilation hole portion 24 in one or two rows may be provided aligning discontinuously or irregularly. When a user inhales with the mouthpiece in the mouth, external air is taken into mainstream smoke through theventilation hole portion 24. Nevertheless, theventilation hole portion 24 need not necessarily be provided. - Tobacco leaves were pulverized to attain D90 of 204 µm and D50 of 66 µm using a grinding mill (ACM-5 from Hosokawa Micron Corporation), thereby yielding leaf tobacco particles. The D90 and D50 were measured using Mastersizer (from Malvern Panalytical Ltd.). The leaf tobacco particles and Sunrose F20HC (cellulose ether from Nippon Paper Industries Co., Ltd.) as a binder were dry-blended using a mixer. Subsequently, the resulting dry blend was added with glycerol as an aerosol former and water as a medium and mixed using a mixer to prepare wet powder. The composition of the respective components is as shown in Table 1-1.
- The wet powder was kneaded six times at room temperature using a kneader (DG-1 from Dalton Corporation) to yield a mixture. A T die was used as a die, and the screw rotation speed was set to 38.5 rpm.
- The wet powder was sandwiched between two Teflon™ films (Nitoflon® No. 900UL from Nitto Denko Corporation) and rolled at four stages using a calendaring machine (from Yuri Roll Machine Co., Ltd.) to attain a predetermined thickness (over 100 µm), thereby preparing a 105 µm-thick laminate having a layered structure of film/wet sheet/film. The roll gaps for the first to the fourth stages were respectively set to 650 µm, 330 µm, 180 µm, and 5 µm. The roll gap for the fourth stage is smaller than the thickness of the finally obtained sheet. This is because the sheet released from the pressure between the rollers expanded near the final thickness.
- The laminate, after releasing one Teflon™ film therefrom, was dried at 80°C for 1 to 2 minutes using a circulation dryer. Subsequently, a wet sheet after releasing the other film was dried under the same conditions to produce a tobacco sheet of the present invention, and the tobacco sheet was evaluated.
-
Table 1-1 Composition in Example 1 Pulverized tobacco leaves Glycerol Binder Water Feed weight proportion [WB weight%] 65 11 2 22 Water content of each component [weight%] 10 13 5.4 100 Feed weight proportion [DB weight%] (proportion in finished sheet composition) 83 14 3 - Weight in wet powder [g] 180.7 31.54 6.2 61.5 Weight proportion in wet powder [WB weight%] 64.5 11.3 2.2 22.0 DB: dry-based
WB: wet-based - In Table 1-1, "weight in wet powder" represents the dry weight for the pulverized tobacco leaves, glycerol, and the binder and represents for water the total amount of the feed weight and the weight of water contained in the pulverized tobacco leaves, glycerol, and the binder.
- Tobacco sheets were produced and evaluated in the same manner as Example 1 except for respectively using, as a binder, Sunrose F30MC and Sunrose F20LC in place of Sunrose F20HC (cellulose ether from Nippon Paper Industries Co., Ltd.).
- A tobacco sheet was produced and evaluated in the same manner as Example 1 except for using, as a binder, Sunrose F30MC in place of Sunrose F20HC (cellulose ether from Nippon Paper Industries Co., Ltd.) and changing the amount of the binder to the amount shown in Table 3 and the amount of glycerol to 15.5 DB weight% as the feed weight proportion.
- Leaf tobacco particles having D90 of 204 µm and D50 of 66 µm were obtained in the same manner as Example 1. The same components as Example 1 and pulp were mixed using a mixer to yield a mixture. A tobacco sheet was produced using the resulting mixture by a common casting process.
-
Table 1-2 Composition in Comparative Example 1 Pulverized tobacco leaves Pulp Glycerol Binder Water Feed weight proportion [WB weight%] 16.5 0.6 4.4 0.6 77.8 Water content of each component [weight%] 9.07 8.66 13.00 6.27 100 Feed weight proportion [DB weight%] (proportion in finished sheet composition) 75.0 3.0 19.0 3.0 - - A tobacco sheet was produced by a common papermaking process, specifically, by: extracting, with water, water-soluble components of a tobacco raw material; mixing the resulting extraction residue, pulp, and water; beating the resulting mixture using a grinder; forming into a sheet using a papermaking machine; drying the sheet; and adding the extract and glycerol to the sheet. The resulting tobacco sheet was evaluated by the same methods as Example 1. The composition of the sheet is shown in Table 2. Further, the evaluation results of the tobacco sheets produced in the examples above are shown in Table 3.
-
Table 2 Composition Tobacco material Glycerol Pulp Proportion in finished sheet composition [DB weight%] 74.3 18.7 7 -
Table 3 Sheet Physical Properties Sheet Raw material particle size Binder Surface roughness Sa Tensile strength Elongation Volume of detached shreds D50 D90 Type Amount [weight%∗] [µm] [N/mm2] [%] [mm3] [µm] Ex. 1 Laminate 66 204 F20HC 3 15.3 3.42 3.6 4.9 Ex. 2 Laminate 66 204 F30MC 3 8.4 1.24 2.1 12.5 Ex. 3 Laminate 66 204 F30MC 1.5 8.0 1.24 2.1 15.4 Ex. 4 Laminate 66 204 F20LC 3 7.4 1.37 2.3 15.1 Comp. Ex. 1 Cast 66 204 F30MC 3 35.1 2.83 2.9 45.5 Comp. Ex. 2 Papermaking - - - - 38.0 0.96 2.03 - *dry weight-based (DB) - Hereinafter, the evaluation methods will be described.
- An internal-heating non-combustion smoking system illustrated in
Fig. 2 was prepared. The tobacco sheet produced in each example was cut into shreds. The shreds were packed within awrapper 22 of 12 mm in length and 7 mm in diameter at 70 volume% to prepare atobacco segment 20A. The system was subjected to a smoking test (14 puffs, CIR conditions, constant heating at 350°C) using a smoking machine. After the smoking test, the shreds were removed gently from thetobacco segment 20A. Subsequently, new shreds were packed within thewrapper 22 again at 70 volume%, and the system was subjected to the second smoking test. The smoking test was repeated in thesame manner 20 times in total, and the total volume of detached shreds remained within thewrapper 22 was measured. - The surface roughness was measured using a microscope (VK-X 100 from Keyence Corporation) through the following procedure of:
- 1) setting the focus position of the lowest portion in a sheet;
- 2) setting the focus position of the highest portion in the sheet;
- 3) dividing the section obtained in 1) and 2) and imaging therethrough while gradually shifting the focus;
- 4) measuring a height from the difference between the focus position of each portion and the focus position of the lowest portion; and
- 5) calculating the roughness from the height data at each position (by automatic calculation using measuring apparatus software) to calculate the arithmetic average surface roughness Sa.
- The obtained sheet was cut into 15 mm in width × 180 mm in length, and the tensile strength was assessed as tensile stress by measuring using a tensile strength tester (Strograph E-S from Toyo Seiki Seisaku-sho, Ltd.) under conditions of load range: 25 and speed range: 50.
-
- 1
- Tobacco sheet
- 1c
- Cut piece of tobacco sheet
- 10
- Heating device
- 11
- Body
- 12
- Heater
- 20
- Heat-not-burn flavor inhaler article
- 20A
- Tobacco segment
- 20B
- Connection section
- 20C
- Filter section
- 21
- Tobacco 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 (10)
- A tobacco sheet comprising a tobacco material and a binder and having an arithmetic average surface roughness Sa of 5 to 30 µm on at least one surface.
- The sheet according to Claim 1, being a pressure-formed sheet.
- The sheet according to Claim 1 or 2, wherein the amount of the binder added is 6 weight% or less on dry weight basis relative to the dry weight of the tobacco sheet.
- The tobacco sheet according to Claim 1, having an arithmetic average surface roughness Sa of 5 to 30 µm on both the surfaces.
- The sheet according to any of Claims 1 to 4, having a tensile elongation of 5 to 15%.
- A heat-not-burn smoking article comprising the tobacco sheet according to any of Claims 1 to 5 or a material derived therefrom.
- A method of producing the sheet according to any of Claims 1 to 5, comprising:step 1 of preparing a mixture by kneading at least a tobacco material, a binder, and a medium;step 2 of preparing a wet sheet by rolling the mixture or extruding the mixture from a die; andstep 3 of drying the wet sheet.
- The method according to Claim 7, wherein the step 2 includes preparing a laminate sheet in which a wet sheet exists between two substrate films.
- The method according to Claim 7 or 8, wherein the step 1 includes kneading at least a tobacco material, a binder, and a medium in a single-screw or a multi-screw kneader.
- The method according to any of Claims 7 to 9, wherein the mixture contains 20 to 80 weight% of a medium relative to the total amount of the mixture.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2020168061 | 2020-10-02 | ||
PCT/JP2021/036386 WO2022071561A1 (en) | 2020-10-02 | 2021-10-01 | Tobacco sheet |
Publications (1)
Publication Number | Publication Date |
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EP4223148A1 true EP4223148A1 (en) | 2023-08-09 |
Family
ID=80951722
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP21875857.1A Pending EP4223148A1 (en) | 2020-10-02 | 2021-10-01 | Tobacco sheet |
Country Status (3)
Country | Link |
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EP (1) | EP4223148A1 (en) |
JP (1) | JPWO2022071561A1 (en) |
WO (1) | WO2022071561A1 (en) |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TW201023769A (en) | 2008-10-23 | 2010-07-01 | Japan Tobacco Inc | Non-burning type flavor inhalation article |
JP6638203B2 (en) * | 2014-03-26 | 2020-01-29 | 大日本印刷株式会社 | Manufacturing method of surface processed film |
JP7155647B2 (en) * | 2018-06-20 | 2022-10-19 | 大日本印刷株式会社 | Release sheets and resin products |
CN112770886B (en) * | 2018-10-04 | 2023-03-31 | 凸版印刷株式会社 | Craft paper for concrete decoration and press molding material for concrete decoration |
WO2020148902A1 (en) * | 2019-01-18 | 2020-07-23 | 日本たばこ産業株式会社 | Method for producing laminated reconstituted tobacco sheet |
WO2020157934A1 (en) * | 2019-01-31 | 2020-08-06 | 日本たばこ産業株式会社 | Flavor generating segment, and flavor generating article and flavor suction system comprising same |
JP2019213895A (en) * | 2019-08-08 | 2019-12-19 | 住友ベークライト株式会社 | Web roll of medical packaging sheet and medical packaging material |
-
2021
- 2021-10-01 JP JP2022554131A patent/JPWO2022071561A1/ja active Pending
- 2021-10-01 WO PCT/JP2021/036386 patent/WO2022071561A1/en unknown
- 2021-10-01 EP EP21875857.1A patent/EP4223148A1/en active Pending
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JPWO2022071561A1 (en) | 2022-04-07 |
WO2022071561A1 (en) | 2022-04-07 |
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