A - Human Necessities – 24 – D
Patent
A - Human Necessities
24
D
131/21
A24D 3/00 (2006.01) A24D 3/08 (2006.01)
Patent
CA 1137379
ABSTRACT A smoke-filter rod comprises a body of rod form consisting or having as at least major constituent a thermo- plastics cellulose acetate or polypropylene smoke-filtration material, preferably of a fibrous or filamentary nature, and wrapped in a plugwrap comprising at least 50%, suitably at least 90%, by weight of fibres or filaments of, respect- ively, cellulose acetate or polypropylene material of substantially the same chemical identity as said major constituent of the filtration material, said plugwrap being bonded to said body and having a permeability for air of not less than l0,000 Coresta units. The bonding is by an agent which is a bonding agent for the material of said plugwrap and said filtration material, suitably triacetin in the case of cellulose acetate. Portions of such filter rod can be subjected to a hot-shaping process. For making such filter rod, a continuous tow or web of the smoke-filtration material may be impregnated with a bonding agent and gathered into a rod-form body and wrapped in continuous fibrous or filamentary plugwrap, whereby said plugwrap is bonded to said rod-form body. The rod formation and wrapping may be carried out by feeding the filtration material and plugwrap together to a garniture.
358642
British-American Tobacco Company Limited
Ridout & Maybee Llp
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