Producing double-walled helically wound thermoplastic pipe

Details Producing double-walled helically wound thermoplastic pipe Producing double-walled helically wound thermoplastic pipe

B - Operations, Transporting

29

D

18/751

B29D 23/18 (2006.01) B29C 53/78 (2006.01) B29D 23/00 (2006.01)

Patent

CA 1194662

ABSTRACT PRODUCING DOUBLE-WALLED HELICALLY WOUND THERMOPLASTIC PIPE A system is disclosed for the production of double-walled helically wound thermplastic pipe. The apparatus includes an endless former (10) of the axially advancing and rotating type for forming a band of thermoplastic material (24) into a corrugated outer wall (26). An internal extruding device (28) extends along the core of the former and extrudes a second band (34) of thermoplastic material onto the interior of the outer wall. A cold shoe (36) presses the inner wall against the outer wall to form a smooth inner wall (42) of the double-walled pipe. It is also possible to provide for the insertion of a reinforcing profile in the corrugations of the outer wall.

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