Method and apparatus for making tobacco smoke filter

Details Method and apparatus for making tobacco smoke filter Method and apparatus for making tobacco smoke filter

1976-12-02

1977-09-06

Coan, James F.

93 77FT, A24C 550

Patent

active

040460630

ABSTRACT:
Tobacco smoke filters and methods and means for making same wherein the products have an elongated hollow inner member overwrapped with a conventional plug wrap, with an intermediate member interposed therebetween. The intermediate member is comprised preferably of a filtering material different from that which forms the inner member so as to provide selective filtration through the two layers of filtering material, the intermediate member functioning to remove larger particles of undersirable material so that the interstitial spaces of the inner member are not clogged thereby. Moreover, the presence of the intermediate member provides a smooth outer surface for attaching a conventional plug wrap without the need for an internal glue line. The inner member is formed continuously as a crimped rod and is used in place of the mandrel for forming the hollow intermediate member thereover.

REFERENCES:
patent: 3637447 (1972-07-01), Berger et al.
patent: 3805682 (1974-04-01), Lyon et al.
patent: 3805801 (1974-04-01), Berger et al.
patent: 3994306 (1976-11-01), Berger

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