Multi-layered metallic pipe and method of coating the metallic p

Details Multi-layered metallic pipe and method of coating the metallic p Multi-layered metallic pipe and method of coating the metallic p

1998-04-22

2000-03-28

Hook, James

Pipes and tubular conduits

Flexible

Distinct layers

138121, 138143, 138146, F16L 1111

Patent

active

060418273

ABSTRACT:
A multi-layered metallic pipe having resistances to the chipping of pebbles and splashing of muddy water while driving a vehicle and excellent corrosion resistances. The multi-layered metallic pipe is piped without scraping and does not need an insulator. The multi-layered metallic pipe includes a metallic pipe having a relatively small plated diameter with a film made of zinc, aluminum or a zinc/aluminum based alloy on the outer circumference of the metallic pipe. A first layer of a polyamide resin, a polyviny fluoride, or a polyvinylidene fluoride having a film thickness of 20 to 50 microns is applied to the plated film. A second layer made of an extrudible resin having a film thickness of 100 microns to 1.0 millimeter and a chipping resistance is coated over the first layer along an entire length of the first layer. The second layer is formed to have stepped portions of different thickness. A method of coating the multi-layered metallic pipe includes forming the first layer on the outer circumference of the plated metallic pipe and the subsequent step of forming the second layer with stepped portions of different thicknesses by extruding the resin at an intermittently different feed rate.

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