To provide as safe and efficient a plastic injection mold as possible,the mold designer should specify the use of limit switches to confirm that moving core is in its forward or retracted position.These position signals can be used by the injection molding machine to ensure that the moving cores are properly positioned so as to not damage the molded parts or the injection mold during mold opening or part ejection.Furthermore,the mold designer should strive to design the moving core such that the injection mold opening or part ejection does not damage the mold if the moving core is improperly positioned.Consider,if the mold is opened and the part ejected with the moving core in itis forward position,it is nearby ejector sleeve and ejector blade.Obviously,this event is undesired and should not occur for a properly set molding process.However,such events do occur and molders greatly appreciate a robust injection mold design that can withstand intermittent abuse without reworking the ejector pins,blades,sleeves,or moving cores.

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