Injection molding form and process for producing hollow parts

Details Injection molding form and process for producing hollow parts Injection molding form and process for producing hollow parts

B - Operations, Transporting

29

C

B29C 45/36 (2006.01) B29C 45/00 (2006.01) B29C 45/26 (2006.01) B29D 23/00 (2006.01)

Patent

CA 2262757

This invention concerns a process for producing closed or open hollow parts out of plastics. To this effect, a core (12) or mold body which extends into the mold cavity and is attached to a form element and supported on other form elements is situated between two mold half-shells. The core is supported by one or more movable stops (13-18) which can be retracted from the mold cavity. Plastic is injected into the mold via a first injection channel (22) with the core in retained position. Subsequently the retaining stops (13-18) are retracted and the mold cavity is completely filled via a second injection channel (23, 24, 25).

L'invention concerne un procédé de production de corps creux en matière plastique fermés ou ouverts. A cet effet, un noyau (12) ou corps moulé faisant saillie dans la cavité du moule, fixé sur une partie du moule et en appui contre d'autres parties du moule, est placé entre deux demi-moules. Le noyau est maintenu en appui au moyen d'une ou plusieurs butées mobiles (13-18) pouvant être extraites de la cavité du moule. La matière plastique est injectée dans le moule par l'intermédiaire d'un premier canal d'injection (22), le noyau (12) étant en appui. Ensuite, les butées (13-18) sont retirées et la cavité du moule est entièrement remplie par l'intermédiaire d'un deuxième canal d'injection (23, 24, 25).

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