3 Plate mold


  • cold runner system
  • 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
  • retaining undercuts hold the gate on the fixed mold half,

  • gate tears off from the part

  •  close cavity spacing

    greater design freedom by possibility of various sprues

  • Latches or pull-tabs determine the path to drive up plates

  • actuator:


  • mostly driving up movement of the machine
  • hydraulic cylinders
  • air cylinders