Fluid filter and methods for making same

B - Operations – Transporting – 01 – D

Patent

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18/76, 182/76

B01D 29/15 (2006.01) A61M 1/36 (2006.01) B01D 19/00 (2006.01) B01D 29/11 (2006.01) B29C 45/26 (2006.01)

Patent

CA 2310732

A filter having a substantially cylindrical or slightly tapered body design which has a plurality of elongated apertures formed therethrough. Each aperture is defined side to side by a pair of elongated, wedge-like rib members disposed one on each side of each aperture, and top to bottom by a pair of cross members which present a substantially square top side and an angularly declining bottom side. The end effect is a substantially rectangular entry aperture for fluid flow with the exception of the declining bottom side which promotes smooth, low resistance entry flow. The present invention is also directed to a method of manufacture of filters having the above-described characteristics. In particular, the preferred method involves an injection molding process in which a molten plastic (such as high-density polyethylene, HDPE) is injected into a two-part mold. The mold generally comprises a smooth, substantially cylindrical cavity and a notched and grooved core which is inserted into the cavity in a partial surface to surface contact relationship to complete the filter mold. Due to the extremely close tolerances required by such a core and cavity surface to surface relationship, unique mold alignment modifications were also developed.

L'invention concerne un filtre composé d'un corps sensiblement cylindrique ou légèrement conique présentant un certain nombre d'ouvertures allongées sur toute sa périphérie. Chaque ouverture est définie horizontalement par l'espace s'inscrivant entre deux baguettes cunéiformes et verticalement par deux éléments transversaux présentant une partie supérieure sensiblement carrée et une partie inférieure évasée. Il en résulte une ouverture sensiblement rectangulaire destinée à l'écoulement du fluide et un côté inférieur évasé opposant une légère résistance à l'écoulement. L'invention porte également sur un procédé de fabrication de filtres présentant les caractéristiques susmentionnées. Selon le procédé préféré, on emploie une technique de moulage par injection qui consiste à injecter un plastique fondu (tel qu'un polyéthylène haute densité, (HDPE) dans un moule composé de deux parties. Celui-ci comprend généralement une cavité lisse et sensiblement cylindrique et un noyau dentelé et canulé inséré dans la cavité, les surfaces de ces deux éléments entrant partiellement en contact pour former le moule du filtre. Etant donné que le contact entre les deux surfaces doit se conformer à des tolérances extrêmement étroites, des modifications relatives à l'alignement du moule ont également été apportées.

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