Patent ID: 7575658
Filing Date: 2009-08-18
Classification: B07B,D21C

Abstract:
1. A method of washing pulp for the manufacture of paper, the method comprising: rotating a cylindrical drum having a mesh screen defining an exterior wall in a vat of pulp; applying a vacuum within the cylindrical drum until a pulp mat is deposited on the exterior wall; applying a washing liquid to the pulp mat on the exterior wall, the washing liquid flowing as filtrate through the pulp mat and through the mesh screen into a plurality of outer filtrate channels disposed radially inward from the mesh screen; diverting at least a portion of the filtrate into a plurality of inner filtrate channels disposed radially inward from the outer filtrate channels via a transfer channel connecting the outer filtrate channels and the inner filtrate channels; and directing the filtrate to a drain valve via a plurality of radial drainage chutes disposed adjacent a head end of the outer and inner filtrate channels.