Filters and method of producing such filters

Details Filters and method of producing such filters Filters and method of producing such filters

A - Human Necessities

24

D

131/17, 131/80

A24D 3/00 (2006.01) A24B 3/00 (2006.01) A24D 3/02 (2006.01) A24D 3/04 (2006.01)

Patent

CA 1160533

ABSTRACT The filter comprises a tobacco smoke filtration tube 1 ensheathed in a layer 3 of smoke pervious thermoplastic material. The layer 3 is encased in a plugwrap 4. The layer 3 has a transverse cross-section rendered impervious to tobacco smoke by means of an annular sealing groove 5 formed by heatable formers 54. The tube 1 is closed at a location spaced longitudinally from the groove 5 by a V-shaped annular groove 7. The grooves 5, 7 may be sealed by means of an applied barrier material 63', 63" respectively.

379174

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