Ventilated thermoplastic polymer foam filter rods

Details Ventilated thermoplastic polymer foam filter rods Ventilated thermoplastic polymer foam filter rods

1981-09-11

1983-10-25

Millin, V.

Tobacco

Smoke separator or treater

Having a polymer

131336, 264DIG14, 264DIG48, A24D 304

Patent

active

044112807

ABSTRACT:
Ventilated thermoplastic polymer foam filter rods and the processes for their preparation. The ventilated thermoplastic polymer foam filter rods are characterized by the presence of at least some cells which are bridged by fibrils, the rod being surrounded by a high density skin structure having a discontinuity such as to produce a ventilation of at least 50%. Discontinuity in the skin structure may be produced by skin solvent etching, skin abraiding, skin perforating and skin cutting.

REFERENCES:
patent: 2988088 (1961-06-01), Schur
patent: 3574134 (1970-12-01), Dock
patent: 3678941 (1972-07-01), Dixon
patent: 4232574 (1980-11-01), Hall
patent: 4282890 (1981-08-01), Howell et al.

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