Tobacco smoke filter and method and apparatus for making the...

Details Tobacco smoke filter and method and apparatus for making the... Tobacco smoke filter and method and apparatus for making the...

A - Human Necessities

24

D

131/17, 131/80

A24D 3/00 (2006.01) A24D 3/04 (2006.01)

Patent

CA 1190113

ABSTRACT An improved tobacco smoke filter is characterized by longitudinally continuous grooves running from end-to- end in the peripheral surface of a smoke-impervious filter plug wrap. Smoke-impervious tipping surrounds the plug wrap to seal the grooves except for small ventilation holes in the tipping which permit communication between the grooves and the ambient air. In a preferred embodiment, the grooves are restricted toward the mouth end of the filter and the degree of restriction determines the direc- tion of air and smoke flow in the grooves. The grooves are each preferably formed as two longitudinal sections of different cross-section. Apparatus and method for manu- facturing the filter are disclosed.

388949

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