JOINING OF MULTILAYER THERMOPLASTIC PIPES

Title:

JOINING OF MULTILAYER THERMOPLASTIC PIPES

Document Type and Number:

WIPO Patent Application WO2004106038

Kind Code:

A3

Abstract:

First and second pipes (92, 94) having at least two concentric layers of thermoplastic material are joined to form a pipe assembly. A non-planar mating surface (93, 95) is prepared on the end of each pipe. The pipes are brought into abutment at the mating surfaces (93, 95) to form a joining zone. Each of the mating surfaces (93, 95) is heated and then cooled under compression to solidify the joining zone, thereby forming a weld. Preferably separate heating processes are used to melt and join the separate layers, thereby substantially eliminating the intermingling of the layers, which may be chemically incompatible. A strong, durable joint is effected in a simple and reliable manner. Optionally, a melt flow insert is disposed between the pipes (92, 94) being joined to provide physical separation between the volumes of the different layers that are melted during the formation of the joint.

Inventors:

KAGAN VAL A (US)
KELLEHER JAMES M (US)
VIOLA WALTER J (US)

Application Number:

PCT/EP2004/005248

Publication Date:

March 03, 2005

Filing Date:

May 15, 2004

Export Citation:

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Assignee:

BASF AG (DE)
KAGAN VAL A (US)
KELLEHER JAMES M (US)
VIOLA WALTER J (US)

International Classes:

B29C65/00; B29C65/02; F16L9/133; F16L11/04; F16L13/02; B29C35/08; B29C65/14; B29C65/16; B29C65/34; (IPC1-7): B29C65/02; F16L9/133; F16L11/04

Domestic Patent References:

WO2000020157A1

2000-04-13

Foreign References:

DE20213974U1	2002-11-07
DE3708705A1	1988-10-06
EP0288884A1	1988-11-02
JPH06147386A	1994-05-27
GB1329364A	1973-09-05
EP1130303A1	2001-09-05
US5918643A	1999-07-06
US4630846A	1986-12-23

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