Method for forming a plastic pipe

Details Method for forming a plastic pipe Method for forming a plastic pipe

1975-11-20

1976-11-09

Kucia, Richard R.

Plastic and nonmetallic article shaping or treating: processes

Including step of generating heat by friction

264310, 264312, B29C 1500

Patent

active

039911500

ABSTRACT:
The invention relates to a method for providing a thermoplastic pipe with an inner groove, by subjecting a heat plasticized pipe to the action of some rotatably supported deforming rollers which are expanded and rotated by means of a mandril. A relative rotating motion between said deforming rollers and the pipe is maintained until the pipe is no longer permanently deformable and the relatieve rotating motion is maintained to strengthen the walls of said groove.

REFERENCES:
patent: 3278665 (1966-10-01), Harrison
patent: 3484900 (1969-12-01), Sands

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