Method of making fibrous electrets

Details Method of making fibrous electrets Method of making fibrous electrets

1981-03-12

1983-03-08

Hall, Carl E.

Metal working

Method of mechanical manufacture

Electrical device making

55131, 55155, 55DIG5, 55DIG39, 361233, 264 22, B29J 100, H01T 1900

Patent

active

043757189

ABSTRACT:
A process of manufacturing an electrostatically charged filtration medium is disclosed. A web made of nonconductive thermoplastic fibers is contacted on each side with a more conductive web to form a combined web. The combined web is charged with electrically charged particles from corona charging elements on opposite sides of the web. The charging elements are operated at a voltage of from 5 to 25 kV but with opposite polarity.

REFERENCES:
patent: 3192385 (1965-06-01), Antokal
patent: 3449094 (1969-06-01), Baxt et al.
patent: 3658620 (1972-04-01), Hall
patent: 3985914 (1976-10-01), Sasaki et al.
patent: 3998916 (1976-12-01), van Turnhout
patent: 4069026 (1978-01-01), Simm et al.

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