Method of making fibrous electrets

Details Method of making fibrous electrets Method of making fibrous electrets

H - Electricity

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H01G 7/02 (2006.01) B01D 39/08 (2006.01) B03C 3/28 (2006.01) B29C 71/00 (2006.01) D04H 1/42 (2006.01) B01D 39/16 (2006.01) B29C 59/10 (2006.01)

Patent

CA 1194448

METHOD OF MAKING FIBROUS ELECTRETS Abstract of the Disclosure A process of manufacturing an electrostatically charged filtration medium is disclosed. A web made of noncon- ductive 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.

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