Injection moulding machine

B - Operations – Transporting – 29 – C

Patent

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Details

B29C 45/56 (2006.01) B29C 45/04 (2006.01) B29C 45/16 (2006.01) B29C 45/26 (2006.01) B29C 45/32 (2006.01)

Patent

CA 2576378

The invention relates to an injection moulding machine, especially for the injection-compression moulding of large-surface plastic moulded parts, said machine comprising at least one first injection mould (13) consisting of two half-moulds (15, 16) and forming a first cavity (17) with a first projected surface, and a second injection mould (14) consisting of two half-moulds (18, 19) and forming a second cavity (20) with a second projected surface. Respectively one half-mould (15, 18) of the two injection moulds (13, 14) is fixed to a common carrier unit (21), and supporting devices (22A to 25A; 22B to 25B) acting in the opening direction are provided for the two injection moulds (13, 14). In order to limit the force applied to the respective cavity, the supporting devices (22A to 25A, 22B to 25B) partially absorb a locking force according to the respective projected surface of the respective cavity (17, 20) such that a secondary compressive force acting on the material injected into the respective cavity (17, 20) is adjusted.

L'invention concerne une presse d'injection, notamment pour le moulage par injection-compression de pièces en matière plastique, comprenant un premier moule d'injection (13) présentant deux demi-moules (15, 16) et formant une première cavité (17) qui comporte une première surface projetée, et un deuxième moule d'injection (14) présentant deux demi-moules (18, 19) et formant une deuxième cavité (20) qui comporte une deuxième surface projetée. Un demi-moule (15,18) respectif des deux moules d'injection (13) est fixé sur une unité de support commune (21). Des dispositifs d'appui (22A à 25A; 22B à 25B) agissant dans le sens d'ouverture sont prévus pour les deux moules d'injection (13, 14). Afin de limiter la force agissant sur la cavité respective, les dispositifs d'appui (22A à 25A; 22B à 25B) absorbent une force de verrouillage en fonction de la surface projetée respective de la cavité respective (17,20) de façon à ajuster une force de maintien en pression agissant sur le matériau injecté dans la cavité respective (17,20).

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