Improved resin impregnated filter media

Details Improved resin impregnated filter media Improved resin impregnated filter media

B - Operations, Transporting

01

D

B01D 39/16 (2006.01)

Patent

CA 2439617

A filter medium is made by coating and impregnating a woven or non-woven substrate with a thermosetting resin so that the yarns or fibres of the substrate are encapsulated and bonded at their points of contact. The resin is diluted to below 15 % e.g. 10 % solids and a rheology modifier such as hydroxy- ethyl cellulose is added before application. The resin is cured by heating to above its curing temperature. The resin may be pre-heated to drive of solvent after application but before curing.

L'invention concerne un élément filtrant qui se fabrique en recouvrant ou en imprégnant un substrat tissé ou non tissé avec une résine thermodurcissable, de façon que les fils ou les fibres de l'élément soient encapsulés et liés à leurs point de contact. La résine est diluée à une valeur inférieure à 15%, p. ex. 10%, de solides, et un modificateur de rhéologie, tel que la cellulose hydroxy-éthyle, est ajoutée avant application. La résine est durcie par un réchauffement à une température supérieure à celle du durcissement. Elle peut être préchauffée pour éliminer le solvant après l'application mais avant le durcissement.

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