Method and apparatus for washing fibre pulp mixture

D - Textiles – Paper – 21 – C

Patent

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Details

D21C 9/06 (2006.01) D21C 9/18 (2006.01) D21D 1/40 (2006.01) D21F 1/80 (2006.01)

Patent

CA 2380100

The invention relates to a method of washing a fibre pulp mixture, in which method the fibre pulp mixture is fed between two filter wires (1, 2) running in the same direction. There is a convergent dewatering space (3) in the direction of travel of the wires, where water is removed from the pulp. According to the idea of the invention, the thickness of the pulp layer being fed between the wires is adjusted during operation, since the ash and fines content of the washed fibre pulp is essentially dependent on the basis weight of the fibre web being washed. In a preferred embodiment of the invention, the height of the slice (23) at the output end of the dewatering space is adjusted. The essential idea of another preferred embodiment of the invention is that the speed of the wires is adjusted.The invention also relates to an arrangement comprising means for adjusting the thickness of the pulp layer being fed between the wires, i.e. the basis weight of the fibre web being washed.

L'invention concerne un procédé de lavage d'un mélange de pulpe fibreuse, selon lequel ledit mélange est amené entre de deux fils de filtrage (1, 2) qui tournent dans le même sens. Un espace de drainage convergent (3), où l'eau est enlevée de la pulpe, se trouve dans le sens de fonctionnement des fils. Selon l'idée de cette invention, l'épaisseur de la couche de la pulpe acheminée entre les fils est adaptée pendant le fonctionnement, étant donné que le contenu en cendre et particules inclassables de la pulpe fibreuse lavée dépend essentiellement du poids de base de la bande fibreuse à laver. Dans un mode de réalisation préféré, la hauteur de la tranche (23) à l'extrémité de sortie de l'espace de drainage est adaptée. L'idée principale d'un autre mode de réalisation préféré de l'invention repose sur le fait que la vitesse des fils est adaptée. Cette invention concerne aussi un ensemble comprenant un dispositif qui permet d'adapter l'épaisseur de la couche de pulpe à acheminer entre les fils, par exemple, le poids de base de la bande fibreuse à laver.

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