Sink Marks

Suggested Corrective Actions

Machine

  • Change pressure set point.
  • Increase cure time.
  • Increase cushion.
  • Increase injection hold pressure.
  • Increase injection hold time.
  • Increase injection pressure.
  • Reduce material melt temperature.
  • Replace or repair worn or broken check ring.

Material

  • Change to material with better or easier flow.

Mold

  • Increase gate size.
  • Increase runner or sprue or nozzle diameter.
  • Reduce mold temperature.
  • Relocate gates to thicker sections of part.