Plastic and nonmetallic article shaping or treating: processes – Direct application of electrical or wave energy to work – Utilizing electrostatic charge – field – force
Patent
1997-05-08
1998-09-01
Chiesa, Richard L.
Plastic and nonmetallic article shaping or treating: processes
Direct application of electrical or wave energy to work
Utilizing electrostatic charge, field, force
55DIG5, 264DIG48, B29C 7104
Patent
active
058007695
ABSTRACT:
There is provided a method for forming a nonwoven electret fiber filter with a nonwoven web of electret fibers needle-punched to an open scrim support. The scrim support material has individual discrete open areas with an average cross-sectional area as viewed from the plane of the filter media of at least 0.25 mm.sup.2, preferably 1.0 mm.sup.2, and a pressure drop across the scrim support, without the filter web, of less than 1.5 mm H.sub.2 O measured at 98.4 meters/min gaseous face velocity. The resulting filter has enhanced lifetimes, a low pressure drop and high filtration efficiencies.
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Bond William J.
Chiesa Richard L.
Griswold Gary L.
Kirn Walter N.
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