Composite filtration media

B - Operations – Transporting – 01 – D

Patent

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Details

B01D 39/16 (2006.01) B01D 39/20 (2006.01)

Patent

CA 2585633

The filtration medium is of a composite construction and includes a liquid permeable nonwoven fabric substrate and a liquid permeable film layer of polyolefin resin adhered to one surface of the nonwoven fabric substrate and forming one of the exposed surfaces of the filtration medium. An antimicrobial agent is incorporated in the film layer. Preferably, the liquid permeable film layer is a polyolefin film having a plurality of liquid permeable apertures extending therethrough. The antimicrobial agent is blended with the polyolefin resin prior to extrusion of the film so that it is present throughout the film layer. The antimicrobial agent may be present in the film layer at a concentration of from 0.01 % to 5% by weight, based on the weight of the film layer.

L'invention concerne un milieu filtrant constitué d'une construction composite et comprenant un tissu non tissé perméable aux liquides et une couche film de résine polyoléfinique également perméable aux liquides adhérant à une surface du tissu non tissé et formant l'une des surfaces exposées du milieu filtrant. Un agent antimicrobien est incorporé dans la couche film. La couche film perméable aux liquides est, de préférence, un film polyoléfinique doté d'une pluralité d'ouvertures laissant passer les liquides. L'agent antimicrobien est mélangé avec la résine polyoléfinique avant l'extrusion du film de sorte qu'il est présent d'un bout à l'autre de la couche film. L'agent antimicrobien peut être dans la couche film à une concentration comprise entre 0,01 % et 5 % en poids basé sur le poids de la couche film.

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