Patent ID: 8048271
Filing Date: 2011-11-01
Classification: B30B,D21C,D21D,D21F

Abstract:
1. Apparatus for washing and dewatering cellulose pulp comprising a first rotatable press roll for use in conjunction with a second rotatable press roll forming a pinch therebetween for dewatering said cellulose pulp, said first rotatable press roll including a first perforated outer surface for dewatering said cellulose pulp, a first inlet disposed adjacent to said first rotatable press roll for supplying said cellulose pulp to said first perforated outer surface, and a first stationary guide member circumferentially enclosing said first rotatable press roll from said first inlet to said pinch and forming a substantially closed vat thereby forming a first pulp passage having a predetermined radial dimension between said first perforated outer surface of said first rotatable press roll and said first stationary guide surface, whereby said cellulose pulp is transported through said first pulp passage as said first rotatable press roll rotates towards said pinch, said predetermined radial dimension increasing over the distance from said first inlet to said pinch whereby said substantially closed vat diverges from said first rotatable press roll, and said first stationary guide surface being substantially free of any perforations for the passage of liquid therethrough in the area of said pinch thereby maintaining the pressure in said area of said pinch.