An apparatus for washing and dewatering pulp

Details An apparatus for washing and dewatering pulp An apparatus for washing and dewatering pulp

D - Textiles, Paper

21

C

D21C 9/06 (2006.01) B30B 9/20 (2006.01) D21C 9/18 (2006.01) D21D 1/40 (2006.01)

Patent

CA 2708244

An apparatus for washing and dewatering pulp comprising a first and a second rotatable press roll (102, 104) having a permeable outer surface (108, 108), and a casing provided with a vat (114, 116, 118) in which the press rolls (102, 104} are installed, the vat (114, 116, 118) partly enclosing the outer surface (108, 108) of each press mil (102, 104) and a gap (124) is formed between the vat (114, 116, 118) and the outer surface (108, 108) of the press rolls (102, 104), the press rolls (102, 104) defining a press nip (112) between them, in which press nip (112) the pulp is pressed, and the apparatus is arranged to feed the pulp in the gap (124) in the direction of rotation of the press rolls (102, 104) and through the press nip (112), and the vat (114, 118, 118) comprises at least one vat segment (114, 118, 118). At least one compartment (119) is provided between the at least one vat segment (114, 116, 118) and the casing, said compartment (119) extends along the longitudinal extension of at least one of the press rolls (102, 104), and the apparatus comprises means for attaining a pressure in the compartment (119) which corresponds to the pressure in the gap (124).

La présente invention concerne un appareil de lavage et d'épaississement d'une pâte à papier comprenant des premier et second rouleaux presseurs rotatifs (102, 104) présentant une surface extérieure perméable (108, 108), et un boîtier pourvu d'une cuve (114, 116, 118) dans laquelle sont installés les rouleaux presseurs (102, 104), la cuve (114, 116, 118) enveloppant partiellement la surface extérieure (108, 108) de chaque moulin presseur (102, 104) et un espace (124) étant formé entre la cuve (114, 116, 118) et la surface extérieure (108, 108) des rouleaux presseurs (102, 104), les rouleaux presseurs (102, 104) définissant entre eux une ligne de pression (112) dans laquelle la pâte à papier est pressée, l'appareil étant conçu pour amener la pâte à papier dans l'espace (124) dans la direction de rotation des rouleaux presseurs (102, 104) et à travers la ligne de pression (112), et la cuve (114, 118, 118) comprenant au moins un segment de cuve (114, 118, 118). Au moins un compartiment (119) est disposé entre l'un des segments de cuve (114, 116, 118) et le boîtier, ledit compartiment (119) s'étendant le long de l'extension longitudinale d'au moins un des rouleaux presseurs (102, 104), et l'appareil comprend des moyens permettant l'obtention d'une pression dans le compartiment (119) qui correspond à la pression dans l'espace (124).

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