B - Operations – Transporting – 21 – K
Patent
B - Operations, Transporting
21
K
26/155
B21K 21/00 (2006.01) B29C 53/82 (2006.01) F16L 55/00 (2006.01)
Patent
CA 1187680
APPARATUS FOR FORMING SPIRALLY WOUND PIPE ABSTRACT An apparatus for producing spirally wound thermoplastic pipe. The apparatus has a helical track and a series of independent moldblocks that run in the track to provide a mandrel surface that rotates and advances axially. A band of thermoplastic material is extruded onto the mandrel surface and wound on the surface in an overlapping helix. The apparatus is equipped with a moldblock return mechanism that receives blocks from the downstream end of the track and returns them to the upstream end, so that unlimited lengths of pipe can be produced.
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