Method of manufacturing an electret filter
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United States of America Patent
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Jun 3, 1986
Grant Date -
N/A
app pub date -
Feb 6, 1985
filing date -
Feb 10, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The disclosed method provides an electret filter having a permanent electrostatic charge and formed of polymer fibers having an intrinsic viscosity of 1.5 or less. Fibers of the requisite viscosity are formed into a non-woven fabric and fed, at room temperature, through a gap between a discharge electrode and a ground electrode while being tightly pressed against the ground electrode. The ground electrode preferrably presents a polished metal surface for contact with the web.
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