B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
B01D 35/06 (2006.01) B01D 39/08 (2006.01) B01D 46/16 (2006.01) B03C 3/28 (2006.01) B32B 5/06 (2006.01) B32B 5/26 (2006.01) B32B 7/08 (2006.01) D04H 13/00 (2006.01)
Patent
CA 2245861
There is provided a nonwoven electret fiber filter formed 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 mm2, preferably 1.0 mm2, and a pressure drop 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.
Ce filtre en non-tissé de fibres électrètes, est constitué d'une nappe en non-tissé de fibres électrètes aiguilletées sur un support de fond ouvert. Le matériau du support de fond présente des surfaces ouvertes discrètes et séparées dont la superficie moyenne de section transversale dans le plan du milieu filtrant est de 0,25 mm<2> au minimum mais de préférence de 1,0 mm<2> pour une chute de pression en traversée du support de fond (hors tissu de filtrage) ne dépassant pas 1,5 mm H2O, mesurée à la vitesse face du gaz de 98,4 mètres/min. On obtient un filtre ayant une durée de vie plus élevée, une chute de pression moins grande et un pouvoir filtrant renforcé.
Minnesota Mining And Manufacturing Company
Smart & Biggar
LandOfFree
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