Process for making a plastic-lined metallic pipe for...

Details Process for making a plastic-lined metallic pipe for... Process for making a plastic-lined metallic pipe for...

2009-02-07

2010-06-15

Hong, John C (Department: 3726)

Metal working

Method of mechanical manufacture

Assembling or joining

Reexamination Certificate

active

07735207

ABSTRACT:
A process for making plastic-lined metallic pipes for conveying liquid or gas includes the steps of heating a metallic pipe evenly to a first temperature; cooling a plastic pipe evenly to a second temperature; inserting the plastic pipe into the metallic pipe to constitute an inner sleeve; drawing the metallic pipe from its two ends; and cooling the sleeved pipe to a storage temperature. The pipe includes a continuous inner plastic sleeve and an outer seamless metallic pipe. The outer diameter of the plastic sleeve is circumferentially melt-bonded to the inner diameter of the outer pipe. The plastic sleeve constitutes an uninterrupted lining for the metallic pipe.

REFERENCES:
patent: 3071162 (1963-01-01), Mick
patent: 6546963 (2003-04-01), Nuss

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