Filter plug

Details Filter plug Filter plug

1982-04-29

1984-12-18

Millin, V.

Tobacco

Smoke separator or treater

By adding constituent to smoke stream

131340, 131341, 131344, A24D 304

Patent

active

044885636

ABSTRACT:
A filter plug having a dual structure comprising filter element A made from a crimped long filter tow in a form of a plug, filter element B, joined to said A, prepared by wrapping a core material consisting of a long fiber tow in a sheet-formed product having grooves which is formed from a material having an air permeability of 8 liters/minute or less and an air permeable wrapping paper and/or a wrapping paper with perforated openings on its periphery which is wrapping therein said filter elements A and B so that the outer grooves parts of the sheet-formed product pass through in the longer direction of the filter plug.

REFERENCES:
patent: 4007745 (1977-02-01), Randall et al.
patent: 4316475 (1982-02-01), Suzuki et al.
patent: 4354889 (1982-10-01), Berger
patent: 4364403 (1982-12-01), Horsewell et al.
patent: 4390031 (1983-06-01), Berger

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