Method of fabricating a metal pipe with an integrally formed lin

Details Method of fabricating a metal pipe with an integrally formed lin Method of fabricating a metal pipe with an integrally formed lin

1991-07-26

1994-05-31

Ball, Michael W.

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

156210, 15624411, 1563099, B29C 4702, B32B 3130

Patent

active

053166060

ABSTRACT:
A metal pipe and method of forming the same with an integrally formed liner for use in corrosive and abrasive environments is disclosed. The liner is comprised of a relatively thick high density polyethylene which is thermally bonded to the metal pipe. An intermediate co-extruded polymer layer of ethylene acrylic acid and a polyethylene/ethylene acrylic acid blend is applied to the metal pipe facilitate thermal bonding. The intermediate layer is applied to the sheet metal in a pre-treatment process prior to roll forming ribs into the sheet metal. The polyethylene liner is applied after the ribs are formed To provide a smooth, hydraulically efficient surface which is resistent to the corrosive action of sulfuric acid and the like encountered in sanitary applications, as well as abrasion caused by the flow of water-born debris such as dirt and gravel as is encountered in culvert applications. Various means for further securing the polyethylene layer to the metal pipe surface are disclosed.

REFERENCES:
patent: 3402086 (1968-09-01), Smith et al.
patent: 3721597 (1973-03-01), Colburn
patent: 3868433 (1975-02-01), Bartz et al.
patent: 4472475 (1984-09-01), Decroix
patent: 4838317 (1989-06-01), Andre et al.
"Adhesives Age", vol. 28, No. 2, Feb. 1985, Adhesive Polymers, pp. 6 and 8.
"Modern Plastics Encyclopedia", vol. 67, No. 11, Oct. 1990, pp. 70 and 823.

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