Process for coating metal tubes and use of the coated tubes

Details Process for coating metal tubes and use of the coated tubes Process for coating metal tubes and use of the coated tubes

1980-10-03

1982-03-16

Beck, Shrive P.

Pipes and tubular conduits

Flexible

Spirally wound material

138139, 138143, 138145, 138146, 156187, 156195, 15624413, 156322, 427195, 427203, 427409, 138DIG1, F16L 1114

Patent

active

043196101

ABSTRACT:
A process for the coating of metal tubes by the application of polyethylene to the preheated tubes, a polyethylene with a melt index of over 1 g/10 minutes being applied first to the pre-heated metal tube and a polyethylene with a low melt index being applied thereupon, the process comprising a first step of applying a polyethylene with a melt index of 1.2 to 70 g/10 minutes (190.degree. C./2.16 kg) to the metal tube which has been pre-heated to a temperature of at least 200.degree. C., a second step in which the coating is cooled to a temperature of about 110.degree. to 170.degree. C. and a third step of applying a self-supporting film of polyethylene with a melt index of 0.1 to 7 g/10 minutes at this temperature so that the total coating has a minimum layer thickness of 1.5 to 4 mm and a coated article coated according to said process.

REFERENCES:
patent: 3348995 (1967-10-01), Baker et al.
patent: 4211595 (1980-07-01), Samour
patent: 4213486 (1980-07-01), Samour et al.

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