Method for continuously manufacturing compound corrugated pipe h

Details Method for continuously manufacturing compound corrugated pipe h Method for continuously manufacturing compound corrugated pipe h

1993-11-19

1995-12-05

Fiorilla, Christopher A.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Corrugating

264515, B29C 4704

Patent

active

054726590

ABSTRACT:
For the continuous manufacture of a compound pipe with a spigot which is substantially smooth on its outside, the compound pipe including a smooth internal tube and an external tube provided with transverse grooves and welded together with the internal tube, an external tube and an internal tube are extruded, the latter into the external tube. While the spigot which is substantially smooth on the outside is manufactured, its external wall is pressure-relieved by compensation chambers.

REFERENCES:
patent: 4865797 (1989-09-01), Jarvenkyla
European Search Report EP 93 11 7224, Jan. 6, 1994.

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