Patent ID: 6588925
Filing Date: 2003-07-08
Classification: B01F,B29B,B29C

Abstract:
A single screw extruder, for extrusion of material such as polymer, comprising a drivable screw having a longitudinal axis and a diameter, at least one flight provided on said screw, a static, parallel barrel rotatably housing said screw so as to define an annular, material flow gap between an exterior of said screw and an interior of said barrel, a mixer to receive material delivered by said screw and through which mixer said material is forced, said mixer comprising a rotor driven by said screw and a stator, said rotor and said stator each carrying rings of teeth adapted to overlap, wherein said material, upon entering said mixer is firstly urged radially outwardly along a first tortuous mixing path, and then returned inwardly along a second tortuous mixing path, said teeth extending axially, or generally so, with respect to said longitudinal axis of said screw, wherein:(i) said mixer has a diameter substantially exceeding that of a delivery end of said screw, such that said teeth of both said rotor and said stator of said mixer are outside said diameter of said screw, and (ii) the material is forced through said mixer principally by the pressure generated within said barrel by said screw.