Injection mould and method for injection moulding an article

Details Injection mould and method for injection moulding an article Injection mould and method for injection moulding an article

B - Operations, Transporting

29

C

B29C 45/38 (2006.01) B29C 45/40 (2006.01)

Patent

CA 2155358

Injection mould comprising at least two mould sections (2, 3) between which a mould cavity is delimited. One (3) of the mould sections is provided with ejector means (42) for removing the product after injection moulding. The other mould section (2) is provided with a gate (5). To enable the solidified sprue to be separated from the moulded article, a bush (8) is also present in which the gate (6) likewise extends. Said bush (8) is constructed to be movable to a limited extend relative to the mould section (2) in which the other part (5) of the gate is made. As a result the sprue can be pulled away from the article in a guaranteed manner. The movement of the bush (8) is controlled by jack means (16, 17). Consequently, controlled breaking of the sprue is possible and the advantage arises that, by releasing the pressure on the jack means (16, 17), no force has to be overcome when the mould is closed.

Moule à injection comprenant au moins deux sections de moule (2, 3) définissant entre elles une cavité de moulage. Une (3) des sections de moulage est équipée d'un dispositif d'éjection (42) permettant d'enlever le produit après le moulage par injection. L'autre section de moulage (2) est pourvue d'un piston (5). Pour permettre à la carotte solidifiée d'être séparée de l'article moulé, le moule comprend également une bague (8) à partir de laquelle s'étend le piston (6). Le manchon est conçu de façon à pouvoir bouger jusqu'à un certain point par rapport à la section de moulage (2) dans laquelle l'autre partie (5) du piston se trouve. Ainsi, la carotte peut être retirée de l'article. Le mouvement de la bague (8) est contrôlé par un dispositif de poussée (16, 17). Par conséquent, il est possible de contrôler la rupture de la carotte d'ou l'avantage, en relachant la pression exercée sur le dispositif de poussée (16, 17), de n'avoir à contrer aucune force au moment de fermer le moule.

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