Electret filter element and method for the manufacture thereof
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United States of America Patent
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Oct 28, 2014
Grant Date -
Jul 14, 2011
app pub date -
Aug 27, 2009
filing date -
Sep 16, 2008
priority date (Note) -
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Abstract
A method for manufacturing an electret filter element includes preparing fibers and producing, by a spray device, a spray mist of fluid droplets which include an electrical charge formed by an electric field between detaching fluid droplets and a counter-electrode. The fibers are passed through the spray mist so as to wet the fibers with the fluid droplets. The fibers are laid down to form a fibrous layer.
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