Patent ID: 6306326
Filing Date: 2001-10-23
Classification: B29C,B29K,B29L,B32B,F16L

Abstract:
An extruded product produced by a process comprising:(a) providing an extruder comprising rotor means and stator means for defining an annular feed gap for receiving the extrudable material and for extrusion of the material from the extruder, said rotor means comprising at least one rotor, said stator means comprising at least one stator, at least one of said rotor or stator means comprising means for conveying the extrudable material received in the feed gap from a first part of the extruder to a second part of the extruder with the rotor means rotating at a circumferential speed and for subjecting the conveyed material alternately to an increase and decrease in pressure;(b) providing extrudable material that is oriented by an increase and decrease in pressure;(c) supplying the extrudable material to the extruder with the rotor means rotating at the circumferential speed so as to cause the extrudable material in the form of a polymer melt to be subjected to the increase and decrease in pressure such that it becomes oriented in a helical direction and to be extruded from the extruder; and(d) recovering the extruded product.