Method for producing a resin pipe for use as the inner lining of

Details Method for producing a resin pipe for use as the inner lining of Method for producing a resin pipe for use as the inner lining of

1991-09-11

1992-11-03

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Production of continuous or running length

264 36, 2642094, 264269, 4253261, B29C 4790

Patent

active

051604760

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.

REFERENCES:
patent: 3313870 (1967-04-01), Yazawa
patent: 3541189 (1970-11-01), Yoshikawa et al.
patent: 3752630 (1973-08-01), Takagi et al.
patent: 4867669 (1989-09-01), DaSilva et al.

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