초록 ▼

The sidestream smoke associated with a cigarette or cigarette-like smoking article is reduced by wrapping the tobacco in a double layer of paper. Each layer includes calcium carbonate (i.e., about 30-40% by weight in the outer paper and about 2-15% by weight in the inner paper, the calcium carbonate

The sidestream smoke associated with a cigarette or cigarette-like smoking article is reduced by wrapping the tobacco in a double layer of paper. Each layer includes calcium carbonate (i.e., about 30-40% by weight in the outer paper and about 2-15% by weight in the inner paper, the calcium carbonate in the outer paper having a surface area of about 20-80 square meters per gram by the BET method) and a burn control chemical. The outer layer also preferably includes monoammonium phosphate and sodium carboxy methyl cellulose. The calcium carbonate employed has a relatively high surface area per unit weight. The porosity of the outer layer is about 50-100 cubic centimeters per minute by the Coresta method, and may be adjusted by electrostatic perforation.

대표청구항 ▼

A cigarette comprising a tobacco rod surrounded by inner and outer layers of paper formulated to reduce the amount of sidestream smoke produced by the cigarette, said outer layer of paper having a basis weight of about 30-70 grams per square meter, an initial porosity of about 2-10 cubic centimeters

A cigarette comprising a tobacco rod surrounded by inner and outer layers of paper formulated to reduce the amount of sidestream smoke produced by the cigarette, said outer layer of paper having a basis weight of about 30-70 grams per square meter, an initial porosity of about 2-10 cubic centimeters per minute by the Coresta method, a calcium carbonate filler loading of about 30-40% by weight employing calcium carbonate having a surface area of about 20-80 square meters per gram by the BET method, about 2-10% by weight of a burn chemical, about 0-1% by weight of monoammonium phosphate, and about 0-1% by weight of sodium carboxy methyl cellulose, said outer paper being perforated to increase its porosity to about 50-100 cubic centimeters per minute by the Coresta method, said inner layer of paper having a basis weight of about 15-25 grams per square meter, a porosity of about 20-40 cubic centimeters per minute by the Coresta method, a calcium carbonate filler loading of about 2- 15% by weight, and about 0-2%, by weight of a burn chemical.