Method of forming a multi-layer plastic pipe for conducting flui

Details Method of forming a multi-layer plastic pipe for conducting flui Method of forming a multi-layer plastic pipe for conducting flui

1993-12-23

1998-06-02

Thurlow, Jeffery R.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

15624413, 264508, 264514, 26417126, 26417128, 2642093, 264300, 26417318, 425396, 425462, B29C 4706

Patent

active

057594619

ABSTRACT:
A method of forming a two-layer plastic pipe (4;8) to be laid in the ground for conducting material therethrough forms a core pipe (2) consisting essentially of a first plastic material and forms a detachable outer hose (3;7) of a second plastic material around said core pipe (2) by a suitable coating method, including in said second plastic material an amount of additives effective to protect said core pipe with said outer hose from stresses and loads of laying said core pipe and outer hose and usage thereof in ground.

REFERENCES:
patent: 3649730 (1972-03-01), Benteler
patent: 3740958 (1973-06-01), Cadwell
patent: 3998579 (1976-12-01), Nordstrom
patent: 4144111 (1979-03-01), Schaerer
patent: 4261777 (1981-04-01), Vetter et al.
patent: 4299256 (1981-11-01), Bacehowski
patent: 4728478 (1988-03-01), Sacks et al.
patent: 4790975 (1988-12-01), Jarvenkyla et al.
patent: 4836968 (1989-06-01), Cakmakei
patent: 4906313 (1990-03-01), Hill
patent: 4927184 (1990-05-01), Bourjot et al.
patent: 4932746 (1990-06-01), Calzolari
Abstract JP 3-24392 of Feb. 1, 1991.
English Transaction of JP 3-24392 of Feb. 1, 1991.

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