A - Human Necessities – 24 – B
Patent
A - Human Necessities
24
B
131/80
A24B 3/00 (2006.01) A24D 3/02 (2006.01) A24D 3/04 (2006.01)
Patent
CA 1210658
ABSTRACT For the manufacture of filter rod, filtration mat- erial and plugwrap being a thermally mouldable paperlike material, are fed,continuously to a rod maker, said plug- wrap and rod being brought into contact with a heated moulding means to produce an impression in the peripheral surface of said plugwrap whilst preserving the continuity of the said wrap. The plugwrap includes not less than 25%, suitably 45 to 95%,by weight of synthetic thermoplastic material. At least a substantial proportion of the said thermoplastic material may be in the form of fibrillated fibre. The thermoplastic material may comprise polyeth- ylene and/or cellulose acetate. The thickness of the plugwrap advantageously does not exceed 140 microns and its permeability prior to contact with said heated moulding means does not exceed 100 Coresta Units. By the said impression, the plugwrap is transformed from a paperlike material to a filmlike material of reduced permeability. The rod may be cut into discrete lengths thereof before it is brought into contact with said heated moulding means.
445699
British-American Tobacco Company Limited
Ridout & Maybee Llp
LandOfFree
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