Tobacco smoke filter and method and apparatus for making same

Details Tobacco smoke filter and method and apparatus for making same Tobacco smoke filter and method and apparatus for making same

1986-09-12

1988-11-15

Millin, V.

Manufacturing container or tube from paper; or other manufacturi

Cigarette filter making

With shaping or compacting of filter material

493 42, 493 44, 493 49, A24D 302

Patent

active

047846321

ABSTRACT:
A method and means for making an improved tobacco smoke filter is characterized by the production of longitudinally continuous grooves running from end-to-end in the peripheral surface of a smoke-impervious filter plug wrap with the grooves having a transverse cross-sectional area that varies as a function of longitudinal displacement. 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 the preferred embodiment, the grooves are restricted toward the mouth end of the filter and the degree of restriction determines the direction of air and smoke flow in the grooves. The grooves are each preferably formed as two longitudinal sections of different cross-section.

REFERENCES:
patent: 3324862 (1967-06-01), De Simone
patent: 4149546 (1979-04-01), Luke et al.
patent: 4365641 (1982-12-01), Johnson

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