| 摘要 |
An apparatus for forming a socket on a tube of a thermoplastic material, in which an upsetting movement is effected so that the socketed end is given a wall thickness which is at least equal to the wall thickness of the initial pipe. The apparatus comprises a mandrel, a two-part mold and a thrust member. An annular molding chamber is produced which has a radial dimension which is at least equal to the wall thickness of the pipe to be treated.
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