Method for the production of a composite pipe and an apparatus f

Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor

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156203, 156218, 15624411, 15624412, 15624413, 15624417, 15624423, 1562722, 1563796, 1563801, 156466, 156500, 427239, B29C 4706

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048160997

ABSTRACT:
A method for the production of a composite pipe with at least the inner surface thereof covered with a plastic layer, comprising: forming a coiled metal sheet into a cylinder, during the conveyance of the metal sheet, by a cylindrical inner mold and at least one of a plurality of outer molds lined up in the direction of conveyance of the metal sheet, said outer mold having a housing composed of two separatable parts and being fitted around said inner mold with a fixed space; joining the side edges in the circumferential direction of said cylinder together; and extruding molten resin into a cylindrical shape over the inner surface of the cylinder from the inner mold, resulting in a composite pipe the inner surface of which is covered with a plastic layer.

REFERENCES:
patent: 2912043 (1959-11-01), Bangholtz et al.
patent: 3376181 (1968-04-01), Larson et al.
patent: 4370186 (1983-01-01), Blandin et al.
patent: 4373982 (1983-02-01), Kreager et al.

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