Method of forming cigarette filter material
AssigneeCelanese Corporation
InventorsCharles H. Keith, Richard O. Tucker
Life of this patent
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Abstract
A non-woven cellulose ester fibrous filter sheet material comprising cellulose ester staple fibers and cellulose ester fibrets which exhibits improved filtration properties and the method of its preparation.
Claims3
A method of producing a cigarette filter rod comprising preparing a coherent self-supporting filter sheet material of cellulose ester staple fibers having from about 5% to about 35% of cellulose ester fibrets incorporated therein, said filter sheet material having a surface area in excess of 1 square meter per gram, folding said filter sheet material into a rod-like form and then securing the folded sheet in rod-like form by means of a wrapping strip.
Dependencies are inferred from the claim text.