Multiple filter dynamic washer

D - Textiles – Paper – 21 – C

Patent

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Details

D21C 9/06 (2006.01)

Patent

CA 2173488

A pressurized dynamic pulp washer including an annular hollow housing (10, 30) in which the stock is driven axially along a plurality of stationary, annular, coaxial wash filters (19, 25, 34, 36, 44) in axially reversible directions, with an annular rotatable shell (21, 37) between the wash filters to urge liquid through openings in the filters, to generate axial, radial and circumferential velocities in the slurry to create localized pulses in the slurry to urge liquid through the filters with wash liquid being introduced to replace liquid filtered from the fibers in the slurry.

Un dispositif dynamique pressurisé pour le lavage de la pâte à papier comprend un boîtier annulaire creux (10, 30) dans lequel la matière est entraînée dans le sens axial le long d'une pluralité de filtres de lavage annulaires coaxiaux et stationnaires (19, 25, 34, 36, 44) dans des directions axialement reversibles. Une enveloppe annulaire rotative (21, 37) disposée entre les filtres de lavage permet de pousser du liquide à travers des ouvertures des filtres pour créer des vitesses axiales, radiales et circonférentielles dans la pâte en vue de la génération d'impulsions localisées dans celle-ci, de telle sorte que le liquide soit poussé à travers les filtres pendant que du liquide de lavage est introduit pour remplacer le liquide extrait des fibres de la pâte par le filtrage.

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