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Gate Types and Guidelines for Injection Molding


Achieving the best result for your plastic parts depends on the injection molding gate design. This requires mold engineers to select the right gate type, dimensions, and location. Otherwise, you risk cosmetic defects, warpage, instability, and weld lines.

With a variety of injection molding gate types to consider, your intuition and experience are invaluable. Use this quick reference sheet to help assess your options at a glance. Compare manually trimmed gates and automatically trimmed gates. Then get a close look at common selections including:

  • Edge
  • Overlap
  • Fan
  • Diaphragm
  • Sprue
  • Spoke/spinder
  • Pin
  • Tunnel
  • Cashew

Download the reference sheet and keep it on hand to guide your injection molding gate type decisions.