Process for extruding an open-cell foamed polyolefin filter

Details Process for extruding an open-cell foamed polyolefin filter Process for extruding an open-cell foamed polyolefin filter

1980-02-11

1981-07-21

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By gas forming or expanding

264 455, 264 461, 264176R, 264DIG13, B29D 2700

Patent

active

042798485

ABSTRACT:
A polyolefin filter for tobacco products and the like was prepared. The extruded element is an open-cell foamed polyethylene or polypropylene having a TPM filtration efficiency greater than 20%. The filter rod can be made by extruding polyethylene containing less than 0.2 moles of a volatile blowing agent per 100 grams of resin at a melt temperature between 130.degree. C. and 150.degree. C., the temperature of the die being between 120.degree. C. and 136.degree. C. Higher melt temperature and die temperature are required for polypropylenes.

REFERENCES:
patent: 3785919 (1974-01-01), Hickman
patent: 3871897 (1975-03-01), Ealding
patent: 3939237 (1976-02-01), Naito et al.

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