Smoke filtration

Details Smoke filtration Smoke filtration

A - Human Necessities

24

D

131/22

A24D 3/08 (2006.01) A24D 3/04 (2006.01)

Patent

CA 1142051

A B S T R A C T A rod-form body of smoke filtration material, preferably fibrous or filamentary, is wrapped in a fibrous or filamentary plugwrap comprising at least 50% by weight of fibres of filaments of thermoplastics material. The plugwrap may have permeability for air of not less than 10,000 Coresta units. The majority, suitably at least 80% by weight, of the material of the rod-form body is a material other than the said thermoplastics material of the plugwrap. Thus the smoke-filtration material may comprise crimped polypropylene tow and the plugwrap be composed substantially wholly of fibrous cellulose acetate or conversely. Portions of such filter rod may be subjected to a hot-shaping process to provi grooved filter elements.

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