Producing double-walled helically wound thermoplastic pipe with

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

1986-10-08

1987-08-25

Hoag, Willard E.

Adhesive bonding and miscellaneous chemical manufacture

Surface bonding means and/or assembly means therefor

With bending, folding, winding, or wrapping means

156143, 156144, 156195, 156205, 156210, 15624413, 156294, 156471, 264173, 264286, 425370, 425380, 425403, 425DIG16, 425396, B31F 120, B31F 128

Patent

active

046891749

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.

REFERENCES:
patent: 4292113 (1981-09-01), Hirata
patent: 4368088 (1983-01-01), Asakura et al.
patent: 4510013 (1985-04-01), Lupke et al.
patent: 4521270 (1985-06-01), Lupke
patent: 4575400 (1986-03-01), Ueda

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