Process and device for shaping socket ends on plastic pipes

B - Operations – Transporting – 29 – C

Patent

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Details

B29C 57/04 (2006.01) B29C 57/06 (2006.01)

Patent

CA 2259639

A process is disclosed for shaping socket ends (2) on plastic pipes (1) from hot-deformable plastics, in particular polyolefines or PVC. An area at the end of the pipe (1) having more or less the length of the socket is heated in a heating station up to or above its shaping temperature, is shaped in this state into a socket (2) by means of a socket-shaping tool (5) introduced into the pipe end (3) and is cooled down to a temperature lower than its hot- shaping temperature before and/or after the socket-shaping tool (5) is removed. Clamping devices (13, 14) which engage the pipe wall from inside and outside while enabling the socket-shaping tool to be introduced into the pipe retain the pipe (1) by the outer end of the socket area (2) to allow the socket-shaping tool (5) to be introduced into the pipe, and so the socket area is drawn and not pushed over the socket-shaping tool (5). A device for carrying out this process is also disclosed.

Ce procédé sert à fabriquer des manchons (2) au bout de tubes en plastique (1) à partir de matières plastiques façonnables à chaud, notamment des polyoléfines ou du PVC. Une zone terminale du tube (1) de longueur pratiquement équivalente à celle du manchon est chauffée dans une station de chauffage jusqu'à ou au-delà de sa température de façonnage, est transformée en un manchon (2) au moyen d'un outil de manchonnage (5) introduit depuis l'extrémité (3) du tube, puis est refroidie jusqu'à une température inférieure à sa température de façonnage à chaud, avant et/ou après le retrait de l'outil de manchonnage (5). Des dispositifs de serrage (13, 14) qui s'enclenchent dans les côtés intérieur et extérieur de la paroi du tube sans gêner l'introduction de l'outil de manchonnage dans le tube retiennent le tube (1) par l'extrémité extérieure de la zone de manchonnage (2) avant que l'outil de manchonnage (5) ne soit introduit, de sorte que la zone de manchonnage soit tirée et non poussée sur l'outil de manchonnage (5). L'invention concerne également un dispositif de mise en oeuvre de ce procédé.

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