Plastic and nonmetallic article shaping or treating: processes – Direct application of fluid pressure differential to... – Production of continuous or running length
Patent
1993-03-19
1996-12-31
Vargot, Mathieu D.
Plastic and nonmetallic article shaping or treating: processes
Direct application of fluid pressure differential to...
Production of continuous or running length
264 36, 264516, 26417717, 2642093, 2642094, 2642102, 264230, 264269, 4253261, B29C 4790, B29C 6334
Patent
active
055891314
ABSTRACT:
A thermoplastic pipe for installation in an existing conduit is manufactured in folded form and spooled for storage. The pipe is then reheated to make it pliable for installation and pulled into the conduit for lateral periods. Steam under pressure is used to round the installed pipe. The leading end of the replacement pipe may be restricted by an end clamp which enables hot fluid to pass completely through the pipe and heat the full length, or by an inflatable plug which is displaced to the leading end of the replacement pipe after installation. Methods and apparatus for the manufacturing of the pipe include extruding heated thermoplastic pipe material through a die to form a tubular shape, shaping the resulting hot tubular plastic material in the molten state to the folded form and cooling to provide a pipe with a memory for the folded form.
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Nu-Pipe, Inc.
Vargot Mathieu D.
Wolfson Michael I.
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