Method and apparatus for orienting plastic of a pipe

Details Method and apparatus for orienting plastic of a pipe Method and apparatus for orienting plastic of a pipe

1993-03-09

1995-09-12

Timm, Catherine

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Corrugating

2642095, 425325, 4253261, 425380, 425393, B29C 4720

Patent

active

054494877

ABSTRACT:
A method and an apparatus for the orientation of a plastic pipe, wherein a pipe blank (2) is produced with an extruder and fed into a pipe forming apparatus provided with movable moulds (3), such as a corrugator, the pipe being conveyed forward in the corrugator with said moulds over a mandrel (4), along which the pipe is further conveyed out from the corrugator. In accordance with the invention, the plastic pipe (7) is oriented radially immediately after the corrugator by means of a conically widening mandrel (5) forming an extension of said corrugator. The invention also relates to an oriented ribbed plastic pipe produced by the method.

REFERENCES:
patent: 2708772 (1955-05-01), Moncrieff
patent: 3320637 (1967-05-01), Van Dijk
patent: 4093412 (1976-06-01), Davis et al.
patent: 4663107 (1987-05-01), Takada et al.
patent: 4721594 (1988-01-01), Jarvenkyla 264508

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