| 摘要 |
<p>A method for applying an integral socket to a pipe (50) made from biaxially oriented thermoplastic material, which pipe has a pipe body and is provided, at one or both ends, with an integral socket, in which method a pre-fabricated pipe (50) from biaxially oriented thermoplastic material is subjected to a socket-forming operation using a socket-forming device (51, 53, 54), by means of which an end part, which has been heated to a suitably elevated temperature, of the pipe which has previously been produced, is formed into a socket, after which the end part which has been deformed into a socket is cooled, characterized by 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 if appropriate begin as early as during the heating of the end part.</p> |
