B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
B01D 27/00 (2006.01) B01D 29/21 (2006.01) B01D 29/56 (2006.01) B01D 63/06 (2006.01) B01D 69/10 (2006.01) B01D 71/36 (2006.01)
Patent
CA 2415837
Filter cartridges (10) include a pleated multi-layer filter media (16) having a filtration membrane layer (16a), and a structural support layer (16b) for the membrane layer (16a) which is in the form of an expanded polymeric film mesh. Most preferably, the membrane layer (16a) and the expanded polymeric film support layer (16b) are each formed of a fluoropolymer, most preferably PTFE. The preferred expanded polymeric film support layer (16b) is in the form of a relatively open mesh structure having generally diamond-shaped apertures (20). Improved flow rate characteristics through pleated filter media (16) ensue when diamond-shaped apertures (20) of the mesh (16b) are oriented such that the long dimensions (LD) thereof are substantially transverse to the elongate pleat axis of the pleated filter medium (16) in which the mesh (16b) is employed.
Des cartouches filtrantes (10) comprennent des éléments filtrants multicouches plissés (16) pourvus d'une couche membraneuse de filtration (16a) et d'une couche de support structurelle (16b) de la couche membraneuse (16a) qui présente la forme d'un treillis en film polymère expansé. De préférence, la couche membraneuse (16a) et ladite couche de support du film polymère (16b) sont constituées d'un polymère fluoré, notamment du polytétrafluoroéthylène (PTFE). La couche de support de film polymère expansée préférée (16b) présente une structure de treillis relativement ouverte munie d'ouvertures en forme de diamant (20). On obtient des caractéristiques de débit amélioré à travers les éléments filtrants plissés (16), lorsque les ouvertures (20) du treillis (16b) sont orientées, de manière que les dimensions longitudinales correspondantes sont pratiquement transversales à l'axe de pli allongé de l'élément filtrant plissé (16) dans lequel le treillis (16b) est utilisé.
Borden Ladner Gervais Llp
Pall Corporation
LandOfFree
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