Cigarettes
AssigneeBritish-American Tobacco Company Limited
InventorsHenry G. Horsewell, Robin A. Crellin
Life of this patent
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Abstract
The invention is concerned with a wrapped cigarette and a method of producing the wrapper. A very highly porous wrapping paper, with an air porosity within the range from 2,450 to 20,000cm.sup.3 min.sup.-1 10cm.sup.-2 10cmWG.sup.-1 is produced by perforation from a base paper having a tensile breaking strength of not less than 85 g per mm width of paper. The means number of perforations is suitably within the range from 10 to 150 per cm.sup.2 of the paper and the mean diameter within the range from 30 to 200 microns. A cigarette wrapped in the highly porous paper may advantageously be provided with a tobacco-smoke filter having a filtration efficiency for nicotine within the range of 15 to 30%.
Claims4
A cigarette comprising;
- a rod of tobacco wrapped in a material consisting of a very highly porous paper, with an air porosity within the range from 2,450 to 20,000cm.sup.3 min.sup.-1 10cm.sup.-2 10cmWG.sup.-1 produced from a base paper having a tensile breaking strength of not less than 85 g per mm width of paper by perforation of the paper wherein upon combustion the effect of said material is to produce a low ratio of carbon monoxide to nicotine content in the smoke stream.
Dependencies are inferred from the claim text.