B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/775, 18/787
B29C 47/02 (2006.01) B29C 47/00 (2006.01) B29C 47/54 (2006.01) B29C 47/92 (2006.01) B29C 55/00 (2006.01) H01B 3/44 (2006.01) H01B 13/14 (2006.01)
Patent
CA 1277474
ABSTRACT OF THE DISCLOSURE A method for extruding, stretching and sintering poly- tetrafluoroethylene in a single pass operation to form tubular articles of low density, low matrix tensile strength, sintered polytetrafluoroethylene and articles such as electric cable having low density, low matrix tensile strength sintered polytetra- fluoroethylene insulation applied about a conductor by such method. A high reduction ratio rating polytetrafluoroethylene powder with a lubricant is extruded by an extruder having a low reduction ratio, and the extrudate is heated to remove the lubricant and is stretched prior to sintering of the polytetrafluoroethylene tube which is not stretched, but is held in its previously stretched state, during sintering.
504657
Carlisle Corporation
Osler Hoskin & Harcourt Llp
LandOfFree
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