Importance

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Abstract

Various steps in the operation of an insulated runner injection molding system are automated by computer generated responses to various sensing steps or other steps to thereby reduce the performance requirements of the system operator. In automatic response to a manual operation incident to closure of a machine gate after an end-of sequence signal, a computer causes mold-cavity-encasing mold parts to be engaged. In automatic response to sensing such engagement of the mold-cavity-encasing mold parts, the computer causes the molding system to be adjusted to enable disengagement of insulated-runner-channel-encasing mold parts. In automatic response to sensing such adjustment of the molding system, the computer causes channel-encasing mold parts to be disengaged, whereupon a sprue is automatically removed therefrom in response to relative movement of the channel-encasing mold parts. In automatic response to sensing such disengagement of the channel-encasing mold parts, the computer causes the machine gate to be opened to enable inspection of the disengaged channel-encasing mold parts. In automatic response to a manual operation incident to closure of the machine gate after the sprue has been removed, the computer causes the molding system to be readjusted to enable injection of molten plastic into the channel and the mold-cavities. In automatic response to sensing such readjustment of the molding system, the computer causes such injection to be initiated. Drool of injected molten plastic into the mold cavities is reduced by varying the product cooling periods.

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First Claim