Process for thickening a fibrous pulp suspension

Details Process for thickening a fibrous pulp suspension Process for thickening a fibrous pulp suspension

D - Textiles, Paper

21

C

D21C 9/02 (2006.01) B01D 33/073 (2006.01) B01D 33/21 (2006.01) D21C 9/18 (2006.01) D21F 1/74 (2006.01) D21F 1/76 (2006.01) D21F 1/78 (2006.01) D21F 1/80 (2006.01)

Patent

CA 2231314

A process for thickening a fibrous pulp suspension by guiding the suspension between a rigid first face and a flexible second face that move in relation to each other and form a converging draining gap, where the first face and/or the second face is/are water permeable, and where the process includes providing the suspension to be drained, forming from the suspension a fibrous pulp layer with a solid matter content of at least about 4% on at least one of the first face and the second face, guiding the fibrous pulp layer into the draining gap, applying a pressure differential in the draining gap via the second face to thicken the fibrous pulp layer, the pressure differential being formed by stretching the second face and pressing the first face and the second face toward each other to drain water from the fibrous pulp layer, and transporting the thickened fibrous pulp from the draining gap.

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