D - Textiles – Paper – 21 – C
Patent
D - Textiles, Paper
21
C
D21C 9/06 (2006.01) D21C 9/18 (2006.01)
Patent
CA 2667242
The invention relates to a washing arrangement (100) comprising two co-operating cylindrical press rolls (102), at least one having a perforated outer surface (104). There is a guide surface (106) at a distance from the perforated outer surface partially enclosing the press roll in the circumferential direction, and a pulp passage (108) is provided between the perforated outer surface and the guide surface. During operation, pulp fed into the pulp passage is guided in direction of rotation and pressed between the press rolls. Filtrate passes through the perforated surface and into the press roll. It is proposed to provide the washing arrangement with means for separate collection of a filtrate flow (128) from a first portion of the pulp passage. Such filtrate contains comparatively high amounts of fiber and can by means of the invention be handled separately from the main filtrate flow (130), reducing the negative effects associated with fibers in the filtrate.
L'invention concerne un dispositif de lavage (100) comportant deux rouleaux de presse cylindriques coopérants (102), dont au moins un présente une surface externe perforée (104). Séparés de la surface externe perforée se trouvent une surface de guidage (106) enfermant partiellement le rouleau de pressage dans la direction périphérique, et un passage de pulpe (108) disposé entre la surface externe perforée et la surface de guidage. Pendant le fonctionnement du dispositif, la pulpe introduite dans le passage est guidée dans la direction de rotation et pressée entre les rouleaux de presse. Le filtrat passe à travers la surface perforée et dans le rouleau de presse. L'invention propose également des moyens de collection séparée d'un écoulement de filtrat (128) à partir d'une première partie du passage de pulpe. Un tel filtrat contient des quantités relativement élevées de fibres et peut, grâce à l'invention, être manipulé séparément de l'écoulement de filtrat principal (130), ce qui réduit les effets contraires de la présence de fibres dans le filtrat.
Fetherstonhaugh & Co.
Metso Paper Inc.
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