Method and apparatus for producing double-walled...

Details Method and apparatus for producing double-walled... Method and apparatus for producing double-walled...

B - Operations, Transporting

29

C

18/751

B29C 53/30 (2006.01) B29C 47/02 (2006.01) B29C 47/28 (2006.01)

Patent

CA 1108816

METHOD AND APPARATUS FOR PRODUCING DOUBLE-WALLED THERMOPLASTIC PIPE ABSTRACT OF THE DISCLOSURE A double-walled pipe of thermoplastic material is produced, constituted of an inner pipe and an outer pipe concentric therewith, in which the outer pipe is formed into the shape of a helical thread. The pipes are extruded, the outer over the inner, and prior to the setting of the outer pipe it is subjected to forming into a helical thread by a rotating mold. The mold includes vacuum forming rollers spaced along a helical path about the outer pipe, the circumferential edges of the rollers being spaced at different distances from the longitudinal axis of the pipes.

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