Process for producing corrugated multi-layer tubing having layer

Details Process for producing corrugated multi-layer tubing having layer Process for producing corrugated multi-layer tubing having layer

1994-02-07

1995-10-24

Vargot, Mathieu D.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Corrugating

264514, 264566, 264571, 264572, 264151, 264166, 264167, 2642095, 2642102, 26417127, 4251331, 4253261, 425396, B29C 3342, B29C 4706, B29C 5330

Patent

active

054607710

ABSTRACT:
A method for producing polymeric tubing which is resistant to permeation by organic material contained therein which has at least one region defined by a plurality of outwardly extending annular ridges. In this method, tubular polymeric material having a first outer diameter and composed of at least three overlying polymeric layers is introduced into a mold device upon exit of the tubular polymeric material from a suitable extrusion device, the surface of the mold device having at least one region defined by an annular depression in an essentially cylindrical surface. Once the tubular material is introduced, it is expanded to a second outer diameter such that the tubular material deformably contacts the mold surface. The corrugated tubular material then exits from the die device after completion of the expansion step.

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