Injection molding apparatus with back-to-back needle valve...

B - Operations – Transporting – 29 – C

Patent

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Details

B29C 45/28 (2006.01) B29C 45/32 (2006.01)

Patent

CA 2664598

The invention relates to an injection moulding device (10) comprising: at least one primary distributor plate (16) that has several flow channels (18); at least two secondary distributor plates (22) that have several flow channels (24) and are located above and below the primary distributor plate (16), the flow channels (24) of the respective secondary distributor plates (22) having a fluidic connection to the channels of the primary distributor plate (16); needle valve nozzles (26), which are arranged back-to-back opposite one another and have a fluidic connection to the flow channels (24) of the secondary distributor plates (22). According to the invention, each needle valve nozzle (26) has a shut-off needle (28) for opening and closing a nozzle outlet and pneumatic or hydraulic piston units (30;71) that drive the shut-off needles (28). Said piston units (30;71) are held in at least one separate receiving plate (32;70), the latter being situated between the secondary distributor plates (22). The device is equipped with means for cooling and/or thermally insulating the receiving plate(s) (32;70).

Dispositif de moulage par injection (10) qui comporte au moins une plaque de répartition principale (16) dans laquelle sont ménagés plusieurs conduits d'écoulement (18), au moins deux plaques de répartition secondaires (22) dans lesquelles sont ménagés plusieurs conduits d'écoulement (24) et qui sont placées au-dessus et au-dessous de la plaque de répartition principale (16), les conduits d'écoulement (24) des plaques de répartition secondaires (22) étant reliés à des fins d'écoulement à ceux de la plaque de répartition principale (16), des buses (26) avec obturateur à aiguille placées les unes en face des autres selon une disposition dos à dos et reliées à des fins d'écoulement aux conduits d'écoulement (24) des plaques de répartition secondaires (22), lesdites buses (26) avec obturateur à aiguille comportant chacune un obturateur à aiguille (28) pour ouvrir et fermer un orifice de sortie de buse, des unités à piston (30; 71) entraînant les obturateurs à aiguille (28) et entraînées de manière pneumatique ou hydraulique, lesdites unités à piston (30; 71) étant logées dans au moins une plaque réceptrice séparée (32; 70) située entre les plaques de répartition secondaires (22), et des moyens destinés à refroidir et / ou à isoler thermiquement la plaque réceptrice (32; 70).

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