B - Operations – Transporting – 29 – D
Patent
B - Operations, Transporting
29
D
B29D 23/18 (2006.01) B29C 47/00 (2006.01) B29C 47/12 (2006.01) B29C 49/00 (2006.01)
Patent
CA 2072663
A double wall plastic pipe is produced from an extruder with a nozzle having a first orifice and a second orifice downstream of the first orifice feeding into a moving mold tunnel having a first region with a corrugated mold surface and a second region with a belled mold surface. The second region also has openings through the mold wall. A first parison of molten thermoplastic material is extruded from the first orifice into the mold tunnel with the first parison being forced against the corrugated mold surface to shape alternating crests and troughs and against the belled mold surface to shape a bell in the first parison in forming respectively corrugated and cuffed pipe parts. The first parison is ruptured through the mold wall openings to produce an air escape in the bell of the first portion. A second parison of molten thermoplastic material is extruded from the second orifice into the mold tunnel and the second parison is forced to lie against and form a solid laminate with the troughs and the bell in the first parison. Air between the second parison and the bell of the first parison is expelled out of the pipe through the air escape passage in the first parison of the mold tunnel through the mold wall openings in the belled mold surface.
Dennison Associates
Lupke Manfred A. A.
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