Means for washing cellulose pulp

Details Means for washing cellulose pulp Means for washing cellulose pulp

D - Textiles, Paper

21

C

92/60

D21C 9/06 (2006.01)

Patent

CA 1127898

ABSTRACT OF THE DISCLOSURE Apparatus for washing cellulose pulp including a drum with a filtering member on its outer shell and stationary hous- ings encircling the drum. A pressurized washing liquid is applied against the cellulose pulp which is in the form of a fiber web upon the filtering member and compartments affixed within the drum receive a suspension liquid displaced from the washing liquid. Pure washing liquid introduced against the ro- tation of the drum is applied against the fiber web forcing suspension liquid to pass through the filter and into compart- ments under the housing. A valve combines the suspension liquid flow from the compartments and conducts the flow to a supply connector at the next-to-last housing taken in the direction of rotation of the drum. This displaced suspension liquid dis- places liquid from the pulp web with flow resistances encounter- ed by the washing liquid between different housings causing pressure differential between washing liquids in different housings. Leakage of washing liquid caused directly from one housing to the next or leakage of suspension liquid displaced from within the fiber web is inhibited by radial lamellae cooperating with the drum and unperforated zones adjacent the housings. Spacing of the lamellae on the drum circumference is less than the length of the unperforated zone so that during drum rotation there is at least one lamella in sealing contact with each unperforated zone located between the housing walls.

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