Patent ID: 6071378
Filing Date: 2000-06-06
Classification: B01D,D21C,D21D,D21F

Abstract:
Method for treating a pulp suspension, in which the suspension is rotated in a rotationally symmetrical, rapidly rotating and liquid-permeable screen basket so that the suspension is subjected to a centrifugal force and dewatered at the same time as the suspension is conveyed by a rotating screw along the inner wall of the screen basket, characterized in that the suspension is caused to rotate by impeller means arranged at the entrance to the screen basket, said impeller imparting an initial increase of speed of rotation to the suspension, which suspension is thrown out towards the inner wall of the screen basket, and in that the outer edges of the said screw bear against the screen basket and rotate at a higher speed than the screen basket so that the screw scrapes the inner wall of the screen basket.