Filter elements

Details Filter elements Filter elements

1974-07-08

1976-02-24

Michell, Robert W.

Tobacco

Tobacco users' appliance

Supports

131 10R, A24B 15027, A24D 104, A24F 102

Patent

active

039398498

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 percent. 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: 3884030 (1975-05-01), Baxter et al.

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