B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/29, 18/726
B29C 47/20 (2006.01) A61F 2/06 (2006.01) B29C 47/00 (2006.01) B29C 55/00 (2006.01)
Patent
CA 1311590
ABSTRACT OF THE INVENTION Apparatus, a method for extruding and expanding tubular products of polytetrafluoroethylene (PTFE) and the products produced thereby are provided. In the apparatus, at least one helical groove is placed in the wall of the extruded tip or die. Preferably, at least one groove is machined in the tip having a pitch angle of 135 degrees and at least one groove is machined in the die having a pitch opposite that (45 degrees) of the tip groove. In the expanded products produced according to the invention, at at least one radial position within the wall of a tube substantially all of the longitudinal axes of the nodes are oriented at an angle between about 85 degrees and about 15 degrees with respect to the longitudinal axis of the tube. In a preferred embodiment, substantially all of the longitudinal axes of the nodes located adjacent the inside wall of the tube are oriented at an angle between about 85 degrees and about 15 degrees with respect to the longitudinal axis of the tube, and substantially all of the longitudinal axes of the nodes which are located adjacent the outside wall of the tube are oriented at an angle between about 15 degrees and about 165 degrees with respect to the longitudinal axis of the tube. For the preferred product, its hoop strength is increased over an otherwise identical tube extruded using smooth surfaced, nongrooved extrusion tip and die.
547153
Biggerstaff Charles Edward
Campbell Michael Lee
Riffle Rob Gordon
Williams Benjamin Griffith
Gowling Lafleur Henderson Llp
W. L. Gore & Associates Inc.
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