Method for making helically wound surface-coating tubes, and...

Details Method for making helically wound surface-coating tubes, and... Method for making helically wound surface-coating tubes, and...

B - Operations, Transporting

21

D

402/267, 154/53.

B21D 51/00 (2006.01) B21C 37/12 (2006.01)

Patent

CA 1158535

ABSTRACT OF THE DISCLOSURE A method and apparatus is disclosed for the production of multiple layer tubes wound from metal strips, with an intermediate layer therebetween. The metal strips are pre-shaped to a generally circular-arcuate configuration while in heated state. A continuous synthetic resin layer is formed during the winding step between the inner and the outer strip layer. A further synthetic resin layer is applied to the interior wall of the tube during its formation. The resin layers are subjected to a first curing step during the formation. Then an exterior coating of a synthetic resin layer is applied and, finally, all resin layers are subjected to a final curing step. The invention makes it possible to produce the tubes in a single, continuous operation.

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