Process for producing electret and production apparatus
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United States of America Patent
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Issued Date -
Apr 14, 2005
app pub date -
Jul 9, 2004
filing date -
Jan 11, 2002
priority date (Note) -
Abandoned
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Abstract
A process for manufacturing an electret article, comprising passing melt-extruded thermoplastic resin fibers through a mist space substantially formed from droplets of a polar liquid, and then collecting the fibers, wherein the thermoplastic resin fibers contain electrical-chargeability enhancing agents, and the average diameter of the droplets is less than 20 .mu.m, is disclosed. Further, an apparatus for manufacturing an electric article, comprising (1) a means for melt-extruding a thermoplastic resin containing electrical-chargeability enhancing agents to form thermoplastic resin fibers; (2) a means for spraying droplets consisting essentially of a polar liquid to a space downstream of a direction of said thermoplastic resin extruded from said means for melt-extruding a thermoplastic resin, to thereby form a mist space, the average diameter of said droplets being less than 20 .mu.m; and (3) a means for collecting said thermoplastic resin fibers which have been passed through said mist space, is also disclosed.
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