Nonwoven, melt blown fluid filtration media with integral...

B - Operations – Transporting – 01 – D

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Details

B01D 39/16 (2006.01) B01D 29/00 (2006.01) B01D 29/11 (2006.01) D01D 7/00 (2006.01)

Patent

CA 2219666

Filtration medium is formed of a mass of non-woven melt blown support and filtration fibers which are integrally co-located with one another. The support fibers (32) have, on average, relatively larger diameters as compared to the filtration fibers (30) 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 elongated central hollow passageway (12) 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 zones (Z1, Z2, Z3) (which additional filtration zones may or may not respectively be provided with integrally co-located support fibers) in annular relationship to another. As result of the melt blown, non-woven fiber structure in accordance to the 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.

Milieu de filtration formé d'une masse de fibres de support et de filtration en non-tissé de fusion-soufflage intégralement co-implantées les unes avec les autres. Les fibres de support (32) ont, en moyenne, des diamètres relativement supérieurs à ceux des fibres de filtration (30) avec lesquelles elles sont intégralement co-implantées. De préférence, le milieu de filtration est disposé à l'intérieur d'au moins une zone annulaire d'un élément de filtration, par exemple d'une cartouche filtrante cylindrique jetable pourvue d'un passage (12) central creux allongé axialement entouré des milieux de filtration. Il est ainsi possible de former, selon la présente invention, une cartouche filtrante en profondeur à une ou plusieurs zones additionnelles (Z1, Z2, Z3) (lesdites zones de filtration additionnelles pouvant être ou non respectivement pourvues de fibres de support intégralement co-implantées) formant un anneau les unes par rapport aux autres. Il est possible d'obtenir, comme résultat de la structure de fibres en non-tissé de fusion-soufflage selon l'invention, dans laquelle au moins une zone de filtration est constituée de fibres de support au diamètre relativement supérieur intégralement co-implantées avec des fibres de filtration au diamètre relativement inférieur, une cartouche filtrante possédant une large gamme de propriétés physiques "construites" (par exemple en termes de filtration, de tolérance aux chutes de pression et autres).

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