Patent ID: 6203740
Filing Date: 2001-03-20
Classification: B29C,B29K,B29L,B32B,F16L

Abstract:
An extruder comprising rotor means and stator means for defining at least two annular conical feed gaps for receiving extrudable material and for extrusion of the material from the extruder, said rotor means comprising at least one rotatable rotor, said stator means comprising at least one stator, said at least one rotor or said at least one stator being disposed between the at least two annular feed gaps, at least one of the rotor or stator means comprising means for conveying at least part of the extrudable material received in the at least two feed gaps from a first part of the extruder to a second part of the extruder with the at least one rotor rotating at a circumferential speed and for subjecting the conveyed material alternately to an increase and decrease in pressure so as to promote a balancing of the at least one rotor or the at least one stator between the feed gaps, said means for conveying and subjecting comprising a plurality of grooves through which at least part of the conveyed material passes from a first of said plurality of grooves to a second of said plurality of grooves.