Injection molding system having spring biased nozzles

Details Injection molding system having spring biased nozzles Injection molding system having spring biased nozzles

B - Operations, Transporting

29

C

18/702

B29C 45/23 (2006.01) B29C 45/20 (2006.01) B29C 45/28 (2006.01) B29C 45/74 (2006.01)

Patent

CA 2010855

A multi-cavity injection molding system or apparatus having a spring and sealing housing mounted between each nozzle and the manifold. Each nozzle reciprocates between a retracted open position and a forward closed position in which the tapered forward end is seated in a gate. The nozzle has a central sleeve portion with a bore which projects rearwardly into a matching bore in the housing. Disc springs received in a channel in the housing which extend around the sleeve portion of the nozzle biases the nozzle to the closed position. Thus, during each cycle injection pressure drives each nozzle to the retracted open position, and then the spring bias drives it to the forward closed position when the injection pressure is released. The spring and sealing housing avoids leakage and misalignment as the nozzle reciprocates.

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