Pleated filter with monolayer monocomponent meltspun media

Details Pleated filter with monolayer monocomponent meltspun media Pleated filter with monolayer monocomponent meltspun media

B - Operations, Transporting

01

D

B01D 39/00 (2006.01)

Patent

CA 2659341

A pleated filter is made from a monocomponent monolayer nonwoven web of continuous monocomponent meltspun partially crystalline and partially amorphous oriented fibers of the same polymeric composition that are bonded to form a coherent and handleable web having a Gurley Stiffness of at least 100 mg and which further may be softened while retaining orientation and fiber structure. Rows of pleats are formed in the nonwoven web, and the web is cut to a desired size and shape to provide a pleated filter element containing a self-supporting porous monocomponent monolayer matrix of fibers bonded to one another at at least some points of fiber intersection and having an average initial submicron efficiency of at least 15 % at a 1.52 meters/sec face velocity. The filter element is deformation resistant without requiring stiffening layers, bicomponent fibers, adhesive or other reinforcement in the filter media layer.

L'invention concerne un filtre accordéon constitué d'une bande non tissée monocouche monocomposante de fibres orientées partiellement cristallines et partiellement amorphes monocomposantes continues filées par fusion de même composition polymère qui sont liées afin de former une bande cohérente et manipulable présentant une rigidité Gurley d'au moins 100 mg, et qui peuvent ensuite être amollies tout en conservant l'orientation et la structure de fibre. Des rangées de plis sont formées dans la bande non tissée, ladite bande étant coupée et mise en forme afin de fournir un élément de filtre accordéon contenant une matrice de fibres autoportante, poreuse, monocomposante et monocouche liées les unes aux autres au niveau d'au moins un point d'intersection de fibres et présentant une efficacité moyenne initiale submicronique d'au moins 15 % à une vitesse frontale de 1,52 mètre/sec. L'élément filtrant est résistant à la déformation sans avoir recours à des couches de raidissement, des fibres bicomposantes, des adhésifs ou d'autres renforcements dans la couche de support de filtre.

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