Pleated filter with bimodal monolayer monocomponent media

Details Pleated filter with bimodal monolayer monocomponent media Pleated filter with bimodal monolayer monocomponent media

B - Operations, Transporting

01

D

B01D 39/00 (2006.01)

Patent

CA 2659356

A pleated filter is made from a monocomponent monolayer nonwoven web containing a bimodal mass fraction/fiber size mixture of intermingled larger size and smaller size continuous monocomponent polymeric fibers of the same polymeric composition. Rows of pleats are formed in the nonwoven web, and the pleated web is cut to a desired size and shape to provide a 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 or other reinforcing measures in the filter media layer.

L'invention concerne un filtre accordéon constitué d'une bande non tissée monocomposante monocouche contenant un mélange de fibres/fractions à masse bimodale de fibres polymères monocomposante continues enchevêtrées de taille plus petite ou plus grande. Des rangées de plis sont formées dans la bande non tissée, la bande plissée étant coupée selon une dimension et une forme désirées afin de fournir un élément filtrant contenant une matrice monocomposante monocouche poreuse autoportante de fibres liées les unes aux autres au niveau d'au moins certains points d'intersection de fibre et présentant une efficacité moyenne initiale submicronique d'au moins15 % à une vitesse frontale de 1,52 mètre/sec. L'élément filtrant résiste à la déformation sans avoir recours à des couches de raidissement, des fibres bicomposantes ou autre solutions de renforcement dans la couche de support du filtre.

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