B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
113/47, 154/53,
B29C 47/02 (2006.01) B21D 5/10 (2006.01)
Patent
CA 1307980
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.
530505
G. Ronald Bell & Associates
Sekisui Kagaku Kogyo Kabushiki Kaisha
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