Filter cartridges having nonwoven melt blown filtration media wi

Details Filter cartridges having nonwoven melt blown filtration media wi Filter cartridges having nonwoven melt blown filtration media wi

1995-05-02

1997-01-07

Fortuna, Ana

Liquid purification or separation

Plural distinct separators

Filters

210503, 210505, 2104971, 210488, 210489, B01D 2400

Patent

active

055913350

ABSTRACT:
Filtration medium is formed of a mass of nonwoven melt blown support and filtration fibers which are integrally co-located with one another. The support fibers have, on average, relatively larger diameters as compared to the filtration fibers which are integrally co-located therewith. Preferably, the filtration medium is disposed within at least one annular zone of a filtration element, for example, a disposable cylindrical filter cartridge having an axially elongate central hollow passageway which is surrounded by the filtration media. A depth filter cartridge in accordance with the present invention may thus be formed having one or more additional filtration zones (which additional filtration zones may or may not respectively be provided with integrally co-located support fibers) in annular relationship to one another. As a result of the melt blown, nonwoven fiber structure in accordance with the present invention whereby at least one filtration zone is comprised of relatively larger diameter support fibers integrally co-located with relatively smaller diameter filtration fibers, a filter cartridge having a wide range of "engineered" physical properties (e.g., in terms of filtration, pressure drop tolerance and the like) can be provided.

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Memtec America Corporation, Technical Bulletin, No. 1903-T, "Procedures for the Laboratory Determination of Filtration Efficiency", 1991.
"Absolute Efficiency Depth Filter Catridge Advances", Reprinted from Filtration & Separation Jan./Feb. 1993.

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