Injection compression mould with venting means

Details Injection compression mould with venting means Injection compression mould with venting means

B - Operations, Transporting

29

C

B29C 45/56 (2006.01) B29C 45/26 (2006.01) B29C 45/34 (2006.01)

Patent

CA 2552893

A mould for injection compression moulding of an article, comprises a female mould part (10) and a core (16) for mounting in use on the platens of an injection moulding machine for movement towards and away from one another between an open and a closed position. A sealing ring (20) surrounds the core 16 for effecting a seal between the female mould part (10) and the core (16). The core (16), the female mould part (10) and the sealing ring (20) together define a closed mould cavity as the core approaches the closed position. In the invention, the sealing ring (20) has a tapering surface (22) that seals against a tapering surface (26) on the core (16) only after the core has reached the closed position, leaving a venting clearance between the tapering surfaces (24, 26) of the sealing ring (20) and the core (16) as the core (16) approaches the closed position.

L'invention porte sur un moule pour le moulage par injection par compression d'un article, ce moule comprenant une partie femelle (10) et une partie centrale (16) et est destiné à être monté, en utilisation, sur les plateaux porte-moule d'une machine de moulage par injection se déplaçant par va-et-vient entre une position ouverte et une position fermée. Une bague d'étanchéité (20) entoure la partie centrale (16) de façon à former un joint entre la partie femelle (10) et la partie centrale (16). La partie centrale (16), la partie femelle (10) et la bague d'étanchéité (20) forment une cavité fermée lorsque la partie centrale approche de la position fermée. Selon l'invention, la bague d'étanchéité (20) présente une surface conique (22) qui joint hermétiquement une surface conique (26) de la partie centrale (16) uniquement lorsque cette dernière a atteint la position fermée, laissant un vide d'aération entre les surfaces coniques (24, 26) de la bague d'étanchéité (20) et la partie centrale (16) lorsque cette dernière (16) approche de la position fermée.

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