Depth filter media

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B - Operations, Transporting

01

D

B01D 39/04 (2006.01) B01D 29/07 (2006.01) B01D 29/11 (2006.01) B01D 39/16 (2006.01) B01D 39/20 (2006.01) B01D 46/52 (2006.01)

Patent

CA 2051056

A porous filter medium is formed by a pleated cylinder of a depth filter medium. An absolute rated inner filtration layer is arranged between upstream and downstream drainage layers. The depth filter medium is formed from a continuous sleeve. Additionally or alternatively at least the downstream drainage layer may be formed integrally with at least a part of an inner filtration layer. The material of the medium may be a fibrous mass of non-woven synthetic polymeric micro-fibres which are free of fibre-to-fibre bonding and are secured to each other by mechanical entanglement or intertwining, with the diameter of the fibrous structure varying across the medium.

Filtre poreux constitué d'un cylindre de matériau filtrant plissé entourant une couche interne (amont) de matériau filtrant à haute efficacité. Le matériau filtrant plissé est formé à partir d'un tube continu. De plus, ou dans une variante, au moins la couche aval du filtre est formée de façon à faire au moins partiellement partie intégrante avec la couche interne. Le matériau filtrant peut être une masse de microfibres de polymère synthétique non collées entre elles et non tissées, maintenues ensemble par enchevêtrement, le diamètre de la structure fibreuse variant d'une partie à l'autre du filtre.

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