Screen media and a screening passage therefor

D - Textiles – Paper – 21 – D

Patent

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Details

D21D 5/16 (2006.01)

Patent

CA 2333570

A screen media (200) for use in screening pulp slurry has a first side (204) and a second side (206). The pulp slurry is fed from the first side of the screen media to the second side of said screen media through a plurality of screening passages (205). Each said screening passage includes a contour cut (210) formed in the first side, a back groove (208) formed in the second side, and a residual thickness (234) between the contour cut and the back groove. An elongate slot (235) is formed in the residual material, and the residual thickness has a substantially uniform thickness about the elongate slot. Where the slot extends completely through the residual material it defines a through- slit (236) through which slurry flows and is filtered.

L'invention porte sur un support (200) de filtration destiné à être utilisé dans la filtration de la pâte et qui est pourvu d'un premier côté (204) et d'un second côté (206). La pâte est amenée du premier côté vers le second côté du support de filtration par l'intermédiaire d'une pluralité de passages (205). Chaque passage comporte une découpe (210) de contour formée dans le premier côté, une rainure (208) arrière formée dans le second côté, une épaisseur (234) restante entre la découpe de contour et la rainure arrière. Une fente (235) allongée est formée dans le matériau résiduel, cette épaisseur restante étant uniforme sur le pourtour de la fente allongée. Lorsque la fente s'étend totalement dans le matériau résiduel, elle forme une fente traversante (236) dans laquelle la boue s'écoule et est filtrée.

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