Screen assembly for a pulp digester

D - Textiles – Paper – 21 – C

Patent

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Details

D21C 7/00 (2006.01) B07B 1/00 (2006.01) D21D 5/02 (2006.01)

Patent

CA 2571408

A pulp digester includes a vessel having an inlet, an outlet and a wall extending between the inlet and the outlet, the wall of the vessel having a curved interior surface. The digester includes a screen assembly positioned inside the vessel adjacent to the curved interior surface of the wall for removing liquid from pulp material. The screen assembly is movable relative to the curved interior surface of the vessel wall. The digester includes at least one support element permanently attached to the vessel wall for limiting movement of the screen assembly relative to the curved interior surface of the vessel wall. In certain embodiments, the at least one support, such as a ledge permanently attached to the vessel wall, supports a portion of the screen assembly. The screen assembly may have an inner face that is concave in a horizontal direction and convex in a vertical direction.

L'invention concerne un lessiveur de pulpe comprenant un récipient présentant une admission, une évacuation et une paroi s'étendant entre celles-ci, la paroi du récipient présentant une surface intérieure incurvée. Le lessiveur comprend un ensemble de tamis positionné à l'intérieur du récipient, de manière adjacente à la surface intérieure incurvée de la paroi, aux fins de retrait de liquide du matériau de pulpe. L'ensemble de tamis est mobile par rapport à la surface intérieure incurvée de la paroi du récipient. Le lessiveur comprend au moins un élément support fixé en permanence sur la paroi du récipient, aux fins de limitation du déplacement de l'ensemble de tamis par rapport à la surface intérieure incurvée de la paroi du récipient. Dans certains modes de réalisation, le support, tel qu'un rebord fixé en permanence sur la paroi du récipient, supporte une partie de l'ensemble de tamis. Celui-ci peut comprendre une surface interne concave dans le sens horizontal et convexe dans le sens vertical.

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