Producing double-walled helically wound thermoplastic pipe with a corrugated cutter wall and a smooth inner wall
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United States of America Patent
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-
Aug 25, 1987
Issued Date -
N/A
app pub date -
Oct 8, 1986
filing date -
Jul 12, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A system is disclosed for the production of double-walled helically wound thermoplastic 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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