D - Textiles – Paper – 21 – D
Patent
D - Textiles, Paper
21
D
D21D 5/02 (2006.01)
Patent
CA 2544825
A screening apparatus for screening pulp suspensions comprises a screen basket (8), a rotor (26) for providing pressure and suction pulses in the suspension to be screened along the screen basket, and a dilution liquid header (28) for supplying dilution liquid to counteract thickening of the suspension during operation. The header forms a tubular channel (46), which divides the screen basket into at least two parts and extends around the basket, and is provided with a plurality of dilution ejection nozzles. Each ejection nozzle forms a channel (58) including at least two channel sections, an entrance channel section (60) that opens into the channel of the header and an exit channel section (62) downstream of the entrance channel section, wherein the entrance channel section is substantially wider than the exit channel section.
L'invention porte sur un appareil de filtrage de suspension de pâtes à papier comportant un panier filtrant (8), un rotor (26) appliquant à la suspension à filtrer le long du panier filtrant (8) des impulsions de pression et de dépression tandis qu'un pulvérisateur injecte pendant l'opération un liquide de dilution qui s'oppose à l'épaississement de la suspension. Le pulvérisateur consiste en un canal circulaire (46) muni de plusieurs buses d'éjection du liquide de dilution, entourant le panier filtrant et placé à mi distance de ses extrémités. Chaque buse est percée d'un canal (58) en au moins deux parties, l'une d'introduction (60) communiquant avec le canal du pulvérisateur et l'autre d'éjection (62), en aval de la partie d'introduction (60), et de section sensiblement moindre.
Fetherstonhaugh & Co.
Metso Paper Inc
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