ELECTROSTATIC FIBROUS FILTER WEB

There is provided a nonwoven electret fiber filter formed with a nonwoven we b 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...

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Bibliographische Detailangaben
1. Verfasser: HASKETT, THOMAS E
Format: Patent
Sprache:eng ; fre
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Zusammenfassung:There is provided a nonwoven electret fiber filter formed with a nonwoven we b 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 mm2, preferably 1.0 mm2, and a pressure dr op across the scrim support, without the filter web, of less than 1.5 mm H2O measured at 98.4 meters/min gaseous face velocity. The resulting filter has enhanced lifetimes, a low pressure drop and high filtration efficiencies.