Valve-gate bushing for gas-assisted injection molding

B - Operations – Transporting – 29 – C

Patent

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Details

B29C 45/17 (2006.01) B29C 44/42 (2006.01)

Patent

CA 2258897

Mold bushings (250) or nozzles for gas-assisted injection molding processes are disclosed. The devices include movable shut-off mechanisms (258) which selectively facilitate or prevent the passage of molten plastic material into mold cavities. One or more apertures (226), such as holes, openings, channels, slits, slots, and the like, are provided at or adjacent the end of the pin members or at the end of the devices. The apertures (226) are thin or small and have dimensions which will allow the passsage of gas and at the same time prevent the plastic material from plugging or clogging them.

L'invention concerne des douilles (250) ou des buses de moule utilisées dans des procédés de moulage par injection assistée par gaz. Les dispositifs présentés comprennent des mécanismes d'obturation (258) mobiles qui facilitent ou empêchent, de façon sélective, l'entrée d'une matière plastique fondue dans des cavités de moule. Une ou plusieurs ouvertures (226) telles que des trous, des canaux, des fentes, des rainures et analogues sont ménagées à l'extrémité des aiguilles ou à l'extrémité des dispositifs, ou bien à proximité des aiguilles ou à proximité de l'extrémité des dispositifs. Ces ouvertures (226) sont minces ou petites et présentent des dimensions qui permettent le passage du gaz tout en empêchant la matière plastique de les boucher ou de les encrasser.

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