Patent ID: 6116770
Filing Date: 2000-09-12
Classification: B29B,B29C

Abstract:
A mixing element for a screw extruder defining an extrusion axis having an axially extending screw shaft comprising:a plurality of contiguous members secured to one another;each member including:a central portion defining a root diameter with a shaft receiving bore for rotating the member; andfirst and second end lobes extending radially from the central portion;each member including said end lobes and central portion having opposing first and second broad surfaces and opposing lateral sides, said first and second broad surfaces lying in parallel planes along said axis, each end lobe having a distal end surface, each of said lateral sides having a surface extending across each side of the central portion and between the end lobes, said first broad surface tapering toward the second broad surface defining a tapered surface lying between said parallel planes at the end surface of the first end lobe;said member having a plane of symmetry; andsaid shaft receiving bores of said members being coaxial for receiving said shaft.