Patent ID: 6106669
Filing Date: 2000-08-22
Classification: B01D,B30B,D21C,D21F

Abstract:
A process for thickening a fibrous pulp suspension by guiding the suspension between a rigid first face that moves relative to a flexible second face to form a converging draining gap, at least one of the first face and the second face being water permeable, the process comprising: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 having a solid content of at least about 4% into said draining gap;applying a pressure differential in the draining gap via the second face to thicken the fibrous pulp layer;the pressure differential 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; andtransporting the thickened fibrous pulp from the draining gap.