Method for manufacturing an electret filter medium
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United States of America Patent
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May 13, 1986
Grant Date -
N/A
app pub date -
Feb 2, 1984
filing date -
Feb 4, 1983
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention relates to a continuous method for manufacturing an electret filter medium from dielectric material having an open or porous structure, said method comprising the steps of continuously feeding a web of dielectric material with a substantially closed dielectric foil adjacent to at least one major face thereof into a corona discharge device, reducing the thickness of the web of dielectric material and charging the web of reduced thickness dielectric material by means of a corona discharge and to apparatus for carrying out said method.
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