Patent ID: 8181570
Filing Date: 2012-05-22
Classification: B30B,B65G,D21B,D21C

Abstract:
1. A screw pipe having a longitudinal axis, an inner surface, a first portion corresponding to an inlet end and a second portion distal from said first portion towards an outlet end, for at least partly enclosing a screw in a plug screw feeder for cellulosic material, said screw pipe including at least one opening between said inlet end and said outlet end for the removal of filtrate dewatered from said cellulosic material, and a plurality of bars disposed on said inner surface, said plurality of bars being inclined with respect to the longitudinal axis of said screw pipe at an angle of inclination with respect to said longitudinal axis of said screw pipe which decreases in the longitudinal direction from said inlet end to said outlet end, said angle of inclination of said plurality of bars at said first portion of said screw pipe comprising a maximum angle of inclination, and said plurality of bars throughout an entire length of said second portion of said screw pipe being substantially parallel to said longitudinal axis of said screw pipe.