Method for producing a resin pipe for use as the inner lining of existing pipes
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United States of America Patent
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-
Nov 3, 1992
Grant Date -
N/A
app pub date -
Sep 11, 1991
filing date -
Sep 18, 1990
priority date (Note) -
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status (Latency Note)
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Abstract
A polyvinyl chloride resin pipe is produced for use as an inner lining for repairing or reinforcing sewerage pipes or other existing pipes. An airtight packing is disposed in the resin pipe and between a traction device and a reheating device, with the traction device pulling forwards the resin pipe which has been extruded from an extruder. An internal pressure is imparted to the resin pipe by introducing compressed air from a forward end thereof so that the resin pipe is depressed flat while being reeled up on a drum in such a state that an internal space is maintained without failure within the resin pipe. In use, a heating medium is fed into the resin pipe from its end so that it rapidly becomes soft uniform as a whole, whereby a defect-free inner lining is formed in the existing pipes.
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