Electrostatic fibrous filter web and method of making same

Details Electrostatic fibrous filter web and method of making same Electrostatic fibrous filter web and method of making same

B - Operations, Transporting

01

D

B01D 39/16 (2006.01) B03C 3/28 (2006.01) D04H 1/54 (2006.01)

Patent

CA 2422769

The present invention provides an electret nonwoven filter medium comprising a nonwoven filter web of electrostatically charged fibrillated fibers ultrasonically joined to each other at a plurality of spots distributed across said nonwoven filter web, the total surface occupied by said spots being less than 5% of the surface of said nonwoven filter web and the number of spots per square centimeter being at least 2. The present invention also provides a method of making the electret nonwoven filter medium.

La présente invention concerne un système de filtrage non tissé à électret comprenant une toile de filtrage non tissée constituée de fibres fibrillaires chargées électrostatiquement et reliées par ultrasons au niveau d'une pluralité de points répartis à travers ladite toile de filtrage non tissée, la surface totale occupée par lesdits points étant inférieure à 5 % de la surface de ladite toile de filtrage non tissée et le nombre de points par centimètre carré valant au moins 2. Cette invention concerne également un procédé permettant la réalisation d'un système de filtrage non tissé à électret.

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