A - Human Necessities – 24 – B
Patent
A - Human Necessities
24
B
131/9, 31/1.1
A24B 15/16 (2006.01) A24F 47/00 (2006.01)
Patent
CA 1284025
ABSTRACT OF THE DISCLOSURE The present invention is directed to methods for producing carbon containing fuel elements especially suited for use in cigarette - like smoking articles. The carbon containing fuel of the present invention is generally a pressed or extruded mixture of a pyrolyzed cellulosic material and a binder, which may include burn additives and/or other ingredients for modifying the characteristics of the fuel. One method of the present invention makes use of two separate pyrolysis steps to ensure that the carbon used to form the fuel elements for smoking articles is substantially free of materials which could adversely affect the aerosol delivered by such articles. This method includes the steps of: (a) pyrolyzing a carbon containing, preferably cellulosic, starting material at a temperature range of from about 400°C to 1250°C, preferably at about 700°C to 800°C, in a non-oxidizing atmosphere; (b) cooling the pyrolyzed material in a non-oxidizing atmosphere; (c) reducing the size of the cooled pyrolyzed material to put such material into particulate or powder form; and (d) heating the size reduced material in a non-oxidizing atmosphere at a temperature of at least 650°C for a period sufficient to remove volatiles therefrom. This twice pyrolyzed carbon material may then be used to fabricate carbon fuel elements useful in smoking articles. Another method of forming carbon products useful for the formation of fuel elements for smoking articles involves two size reduction steps in combination with the intermediate formation of a coherent mass (e.g., by extrusion or by casting) from an admixture of the size reduced carbon and a binder. This assures even distribution of the binder within the carbon particles, and provides a free flowing extrusion or pressing mixture during formation of the fuel element. This method involves the steps of: (a) reducing the size of the pyrolyzed carbon containing material (e.g., from step (a) of the process described above) to an average particle size of about 10 microns or less; (b) admixing the particulate carbon material with sufficient binder and water to make a paste; (c) forming the paste into a coherent mass, e.g., by casting it into a sheet, or by extruding it into a rod-like mass: (d) drying the coherent mass: (e) reducing the size of the dried coherent mass into coarse particles (-10 mesh); and (f) admixing the coarse particles with sufficient water to make a paste which is suitable for forming into fuel elements, e.g., by extrusion or pressure molding.
531976
Farrier Ernest G.
White Jackie L.
Bereskin & Parr
Farrier Ernest G.
Reynolds (r.j.) Tobacco Company
White Jackie L.
LandOfFree
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