Classifications

• • A—HUMAN NECESSITIES
  • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
  • A24B—MANUFACTURE OR PREPARATION OF TOBACCO FOR SMOKING OR CHEWING; TOBACCO; SNUFF
  • A24B15/00—Chemical features or treatment of tobacco; Tobacco substitutes, e.g. in liquid form
  • A24B15/10—Chemical features of tobacco products or tobacco substitutes
  • A24B15/12—Chemical features of tobacco products or tobacco substitutes of reconstituted tobacco

Definitions

• the invention relates to a reconstituted-tobacco material.
• the smoking material contains a proportion of bibulous fibres, preferably in the range of 5 to 25 percent by weight of the smoking material and which are the substantially water insoluble, wet cross-linked derivatives of carboxymethyl cellulose.
• the reconsti tuted tobacco may be of the kind composed of tobacco which has been extracted, pulped, cast and dried and of concentrated tobacco extract added thereto.
• the said tobacco comprises stem and lamina tobacco in a proportion of stem to lamina of substantially 25 to 30 percent and 75 to 70 percent lamina by weight.
• This invention relates to the production of smoking materials comprising reconstituted tobacco.
• the fibrous web formed on the paper-making wire is transferred, while wet, to felts which convey the web to the drying section of the paper-making machine. Drying may be achieved by various means, but a Yankee cylinder followed by smaller heated rolls is generally used. Proper transfer of the web from the wire to the felts is dependent on the wet strength of the web. This depends on the fibrous content of the pulp used and consequently on the stem (midrib) content of the pulp in relation to the lamina (stripped leaf without midrib) content.
• Tobacco leaf as grown generally has 25-30 percent by weight midrib and 75-70 percent lamina, so that the natural proportion of stem to lamina is about 1:3.
• stem to lamina ratio of at least 1:1 and preferably at least 2: 1.
• the higher proportion of stem has a two-fold effect. Not only does it reduce web breakages during sheet formation and drying, but it also enables the wire speed, and thus the output, to be increased (In paper making, this is known as improving the runnability of the pulp). For this reason, it is necessary to increase the fibrous content of the pulp above that which occurs naturally in tobacco leaf. This can be achieved either by the inclusion of additional stem in the pulp or by the incorporation of cellulose fibres, for example of pinus sylvestris.
• a reconstituted-tobacco smoking material includes a proportion of bibulous fibres.
• the smoking material is produced from reconstituted tobacco in pulp, slurry or like form and has blends therewith the bibulous fibers, the composite blend being sheeted in final form a dry sheet from the blended material.
• bibulous fibres are to be understood to be fibres of substantially water-insoluble, wet-cross-linked derivatives of carboxymethylcellulose.
• Such fibres and their production are described in British Patent Specification No. 1,236,313 (Buckeye Cellulose Corporation). They are produced by wet-cross-linking fibres of a water soluble carboxymethyl cellulose salt which has a degree of substitution of 0.8 1.0 carboxymethyl groups per unhydroglucose unit.
• the product is substantially water insoluble fibres which retain the fibrous form of the original cellulose raw material.
• the bibulous fibres may comprise 2-50 percent by weight and preferably 5-25 percent by weight of the final smoking material.
• bibulous fibres are carboxymethyl cellulose derivatives, they do not have a deleterious effect on the subjective character of the smoke from the reconstituted tobacco.
• the total smoke delivery is similar to that obtained when cellulose fibres are incorporated.
• bibulous fibres rather than cellulose fibres are not limited to the reconstitution of tobacco by a paper-making process.
• bibulous fibres may be added instead of the cellulose fibres with a resultant improvement in the subjective smoke character and total smoke delivery of the product, while mechanical properties similar to those obtained by using cellulose fibres are still achieved.
• U.S. flue-cured stems (leaf mid-ribs) threshed into 1-2 inches lengths were extracted three times with water at l00C.
• the stem:water ratio was maintained at 1:10 by weight and the extract was drained off after each extraction and retained for subsequent concentration.
• the fibrous residue was pumped, at 16 percent consistency, through a disk mill with a clearance of 0.035 inches between the plates, this being followed by beating in a Valley beater at 2 percent consistency for ten minutes.
• Bleached woodpulp (97 percent a-cellulose) was beaten at 1 percent consistency in a Valley beater for ten minutes.
• Bibulous fibres obtained commercially as a dried pulp in sheet form were dispersed in water at 1 percent consistency without beating.
• the fibres were of dimensions similar to those of cellulose fibres used in normal paper making.
• the extracts obtained from the stem and lamina were combined in the proportions of 100 parts of stem extract and 300 parts of lamina extract and the combined extracts were concentrated in a climbing-film evaporator to a solids content of percent.
• This concentrated extract was used, after any necessary adjustment of concentration, to impregnate the base sheets, by means of flooded-nip rollers, to a final level of 50 percent (on a dry-weight basis) of extracted soluble substances in the respective base sheets.
• the reconstituted-tobacco sheets thus produced were made into cigarettes 70 mm long by 25 mm circumference. These were used for evaluation by standard machine smoking at one puff per minute of 35 ml volume and two seconds duration to a butt length of 23 mm and for subjective evaluation by a panel of cigarette smokers.
• composition weight mg/cigarette 10% a-cellulose 860 I8 .20% a-cellulose 870 I6 10% bibulous fibre 860 I9 20% bibulous fibre 870 18
• TPM deliveries observed, by collection of smoke on a Cambridge filter pad are of no practical significance.
• the panel of smokers were unanimous in their preference for the cigarettes containing bibulous fibres. In particular, they noted that the cigarettes containing rot-cellulose fibre were irritating to the nose and eyes.
• Samples of the base-sheets were also impregnated by dipping in the tobacco extract concentrated to the solids content of 25 percent. Free liquor was drained off and the impregnated sheets were dried at 100C for 16 hours. The level of impregnation was then determined by Soxhlet extraction with water for 6 hours followed by drying of the extracted residue at 100C for 16 hours.
• a smoking composition in sheet form comprising essentially reconstituted tobacco and from 2 percent to about 50 percent by weight of bibulous fibers constituted of the wet cross-linked substantially water insoluble derivatives of carboxymethyl cellulose.
• a smoking material according to claim 1, wherein the reconstituted tobacco comprises stem and lamina tobacco in a proportion of stem to lamina of substantially 25 to 30 percent stern and 75 to percent lam- 0 ina by weight.

Landscapes

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

Applications Claiming Priority (1)

Publications (1)

Family

ID=10434465

Family Applications (1)

Country Status (8)

Cited By (13)

Families Citing this family (6)

Citations (8)

• 1971
  • 1971-09-24 GB GB4472171A patent/GB1341069A/en not_active Expired
• 1972
  • 1972-08-21 ZA ZA725740A patent/ZA725740B/xx unknown
  • 1972-08-24 CA CA150,300A patent/CA955488A/en not_active Expired
  • 1972-08-25 AU AU45991/72A patent/AU459441B2/en not_active Expired
  • 1972-08-30 US US00285056A patent/US3840024A/en not_active Expired - Lifetime
  • 1972-09-14 BR BR006369/72A patent/BR7206369D0/pt unknown
  • 1972-09-15 FR FR7232739A patent/FR2154037A5/fr not_active Expired
  • 1972-09-23 DE DE2246787A patent/DE2246787C3/de not_active Expired

Patent Citations (8)

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