B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
B01D 33/21 (2006.01) B01D 33/23 (2006.01) D21C 5/02 (2006.01) D21C 9/18 (2006.01) D21D 5/02 (2006.01) D21F 1/66 (2006.01)
Patent
CA 2069876
A disc filter for filtering mat forming suspensions, such as fibre pulp suspensions, is provided with a hollow shaft for receiving a flow of fine fraction created by hydrostatic pressure difference between the suspension to be filtered and the fine fraction in the hollow shaft. According to the invention, each disc (7) is provided with a number of fine fraction chambers (11) communicating with the interior of the hollow shaft via respective holes (12) in the circumferential wall (5) of the shaft. Each chamber (11) is arranged, such that it functions as a dropleg during movement upwards, with the result that the coarse particle (fibre) concentration of the created coarse fraction is increased.
Le filtre à disques décrit, qui sert à filtrer les suspensions formant le matelas, telles que des suspensions à base de pâte de fibres, est pourvu d'un arbre creux destiné à recevoir un flux de fraction fine créé par la différence de pression hydrostatique entre la suspension à filtrer et la fraction fine contenue dans l'arbre creux. Selon la présente invention, chaque disque (7) comporte un certain nombre de chambres (11) pour fraction fine, qui communiquent avec l'intérieur de l'arbre creux par l'intermédiaire de trous correspondants (12) ménagés dans la paroi circonférentielle (5) de l'arbre. Chaque chambre (11) est conçue de façon à fonctionner comme colonne barométrique pendant les mouvements vers le haut, ce qui a pour résultat d'augmenter la concentration en particules (fibres) grossières de la fraction grossière créée.
Gl&v/celleco Ab
Gowling Lafleur Henderson Llp
LandOfFree
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