Welded pfa-to-ptfe structures and method of fabrication

Details Welded pfa-to-ptfe structures and method of fabrication Welded pfa-to-ptfe structures and method of fabrication

B - Operations, Transporting

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B29C 70/76 (2006.01) B29C 35/04 (2006.01) B29C 43/18 (2006.01) B29C 63/34 (2006.01) B29C 65/00 (2006.01) B29C 70/68 (2006.01)

Patent

CA 1053865

Abstract of the Disclosure Perfluoroalkoxy (PFA) fluorocarbon resin is fusion bonded to polytetrafluoroethylene (PTFE) resin to provide united sections thereof and to provide a bonded or welded inter- connection between separate sections of PTFE resin. An example of the latter is a PFA resin welded section joining the ends of the PTFE resin liner and jacket encasing a reinforcing core in a dip pipe. The welds are obtained under minimal pressure, generally below about 40 psi, at a temperature above the gel point of the PTFE resin, generally between 635° F. and 710° F., with subsequent slow cooling under pressures somewhat higher and generally ranging between about 55 psi and 150 psi.

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