Apparatus and method for dewatering cellulose pulp with...

D - Textiles – Paper – 21 – C

Patent

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Details

D21C 9/18 (2006.01) B30B 9/20 (2006.01) D21C 9/06 (2006.01)

Patent

CA 2737310

The invention relates to an apparatus (1) for dewatering cellulose pulp, which apparatus includes two press rolls (2), arranged next to each other, each press roll (2) being provided inside guide surfaces (3), such that a pulp passage (4) is formed between each press roll (2) and the corresponding guide surface (3), wherein an inlet (5) for transferring pulp or the like to said pulp passage (4) is arranged at a first point at each press roll, and wherein the press rolls (2) are arranged to rotate in opposite directions (D1, resp. D2) so as to convey the pulp in a first operational direction (F1) towards a nip (6) that is formed between them at a second point, close to where the guide surfaces (3) intersect, each press roll (2) having a perforated outer surface (7) for withdrawing filtrate from said pulp or the like. At their point of intersection, the guide surfaces (3) include an outlet (8') for withdrawing filtrate that is rejected from the nip (6), said outlet (8') being arranged substantially opposite of the nip (6) and directed such that the filtrate removed through said outlet (8') is conveyed from the pulp passage through a clearance (9') that is formed in a space between the guide surfaces (3). The invention also relates to a corresponding method.

L'invention concerne un appareil (1) d'essorage de pâte cellulosique, ledit appareil comportant deux rouleaux presseurs (2) juxtaposés, chaque rouleau presseur (2) étant disposé à l'intérieur de surfaces de guidage (3), de telle sorte qu'un passage pour pâte (4) est formé entre chaque rouleau presseur (2) et la surface de guidage correspondante (3), une entrée (5) destinée à transférer la pâte ou analogue dans ledit passage pour pâte (4) étant disposée en un premier point au niveau de chaque rouleau presseur, et les rouleaux presseurs (2) étant conçus pour tourner dans des directions opposées (D1 et D2, respectivement) de manière à transporter la pâte dans une première direction opérationnnelle (F1) en direction d'une ligne de contact (6) formée entre lesdits rouleaux au niveau d'un second point, proche de l'intersection des surfaces de guidage (3), chaque rouleau presseur (2) présentant une surface extérieure perforée (7) pour extraire le filtrat de ladite pâte ou analogue. À leur point d'intersection, les surfaces de guidage (3) comportent une sortie (8') pour extraire le filtrat rejeté depuis la ligne de contact (6), ladite sortie (8') étant disposée sensiblement à l'opposé de la ligne de contact (6) et dirigée de telle sorte que le filtrat extrait à travers ladite sortie (8') soit transporté du passage pour pâte à travers un espace intermédiaire (9') formé dans l'intervalle entre les surfaces de guidage (3). L'invention concerne également un procédé correspondant.

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