Multilayered membrane and the method of producing the membrane

Details Multilayered membrane and the method of producing the membrane Multilayered membrane and the method of producing the membrane

B - Operations, Transporting

01

D

B01D 69/02 (2006.01) B01D 39/10 (2006.01) B01D 39/20 (2006.01) B01D 61/18 (2006.01) B01D 63/06 (2006.01) B01D 67/00 (2006.01) B01D 69/04 (2006.01) B01D 69/12 (2006.01) B01D 71/02 (2006.01)

Patent

CA 2669338

The present invention relates to the production of filter membranes (10) and in particular to multilayered filters. The invention related to a method of producing a filter membrane (10) wherein at least two layers (12, 14) are sequentially built upon a forming member (18) such that, when the forming member (18) is removed, the resultant membrane (10) includes a plurality of apertures extending therethrough, and at least some of said apertures increase in cross-sectional area from a first surface of the membrane to a second surface of the membrane. The method of production reduces the risk of permanent plugging from particulates being trapped within the membrane itself and has strong bonds between the layers which reduce the risk of separation of the layers. The present method produces an even coverage of the forming member (18) which in turn results in a layer of uniform thickness. The layer can be controlled by changing the viscosity of the mixture into which the former (18) is dipped.

L'invention concerne la production de membranes (10) filtrantes et en particulier des filtres multicouches. L'invention concerne également un procédé pour produire une membrane (10) filtrante, au moins deux couches (12, 14) étant formées de manière séquentielle sur un élément de formation (18), de sorte que lorsque l'élément de formation (18) est retiré, la membrane (10) qui en résulte comprend une pluralité d'orifices traversants, et lesdits orifices augmentent de taille, en vue transversale, d'une première surface de la membrane vers une seconde surface de la membrane. Le procédé de production réduit le risque de bouchage permanent par des particules piégées à l'intérieur de la membrane et présentent des liaisons solides entre les couches, ce qui réduit le risque de séparation des couches. Le procédé de l'invention produit une couverture égale de l'élément de formation (18), ce qui permet la formation d'une couche d'épaisseur uniforme. La couche peut être contrôlée grâce à la modification de la viscosité du mélange, dans lequel la forme (18) est trempé.

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