Tobacco smoke filter

Details Tobacco smoke filter Tobacco smoke filter

1975-10-31

1977-05-10

Pitrelli, John F.

Tobacco

Cigar or cigarette making

Including cooperating surfaces to induce rolling

131261B, A24D 104

Patent

active

040222217

ABSTRACT:
Tobacco smoke filters wherein the products have both internal and external cavities, with the external cavities being of a limited nature so as to provide a substantially smooth outer surface for attaching conventional plug wrap without the need for an internal glue line. The external cavities comprise from about 5 to no more than 50 percent of the total outer surface of the inner filter member, preferably between about 20 to 30 percent. This enables the inner filter member to provide substantially uniform support to the overwrap. The outer cavities may be in the form of elongated, discrete, grooves, a knurled-like pattern or a continuous helical groove. The resultant filter has high filtration and correspondingly low pressure drop characteristics, with the technique of manufacture being such as to permit higher production speeds than with the prior art, resulting in lower manufacturing costs.

REFERENCES:
patent: 3336928 (1967-08-01), Morehouse
patent: 3533416 (1970-10-01), Berger et al.
patent: 3752165 (1973-08-01), Harllee et al.
patent: 3768489 (1973-10-01), Kiefer et al.
patent: 3805801 (1974-04-01), Berger et al.
patent: 3888160 (1975-06-01), Westcott et al.

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