Function:
- cold runner system
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advantage in that molded parts and sprue spiders are autmatically ejected from two different opening areas (parting planes) of the mold (no separation needed)
- uses tear-off pinpoint gates
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retaining undercuts hold the gate on the fixed mold half,
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gate tears off from the part
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close cavity spacing
greater design freedom by possibility of various sprues
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Latches or pull-tabs determine the path to drive up plates
- actuator:
- mostly driving up movement of the machine
- hydraulic cylinders
- air cylinders