Patent ID: 7329037
Filing Date: 2008-02-12
Classification: B29C

Abstract:
1. A plasticating screw for an extruder or extrusion press having a high polymer melt through-put, wherein the plasticating screw comprises a screw shaft received and rotatably driven in a cylindrical barrel in order to transport the admitted plasticatable polymer to an extruder nozzle located at the other end, the polymer undergoing plastication and being transported and mixed by a screw channel formed by a first flight running helically along the screw shaft, and wherein in at least one region of the longitudinal extent of the plasticating screw at least a second flight running helically along the screw shaft overlaps the first flight, characterized in that the cross-sections of the at least two flights ( 4 , 5 ) in the overlapping region are reduced to such an extent that their overall cross-section corresponds to the cross-section of the first flight ( 4 ) immediately before the overlapping region ( 7 ).