Methods and devices for the production of a pipe from biaxialy oriented thermoplastic material having an integrated socket
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United States of America Patent
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Jul 4, 2006
Grant Date -
Jan 29, 2004
app pub date -
Jul 30, 2001
filing date -
Aug 2, 2000
priority date (Note) -
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Abstract
A method for forming an integral socket to a pipe made from biaxially oriented thermoplastic material is described. The pipe has a pipe body and is provided, at one or both ends, with an integral socket. The biaxially oriented thermoplastic pipe is subjected to a socket-forming operation comprising the steps of fixing both axial ends of the unheated end part of the pipe, heating the fixed end part to a suitable socket-forming temperature in one or more steps, and expanding the axially fixed end part with the aid of a fluid pressure in the interior of the end part and/or a vacuum on the outer side of the end part, which expansion may begin as early as during the heating of the end part.
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