Process Optimization & Defects - MFG-Atlas Forum https://mfgatlas.io/community/process-optimization-defects/ MFG-Atlas Discussion Board en-US Tue, 22 Sep 2026 07:46:59 +0000 wpForo 60 Defect quick-reference: likely causes by defect type https://mfgatlas.io/community/process-optimization-defects/defect-quick-reference-likely-causes-by-defect-type/ Tue, 22 Sep 2026 04:05:19 +0000 A starting point for the most common injection molding defects — always confirm with a DOE, but this narrows the field:

  • Sink marks — insufficient packing time/pressure, thick sections, high melt temperature.
  • Flash — clamp force too low, injection speed/pressure too high, worn parting line.
  • Short shots — venting, material shortage, injection speed too slow, melt temp too low.
  • Silver streaks / splay — moisture in resin, degraded material, excessive shear.
  • Warpage — differential shrinkage, non-uniform cooling, residual stress, unbalanced packing.
  • Burn marks / dieseling — trapped air, poor venting, too-fast fill.
  • Weld lines weak or visible — melt/fill temperature too low, merge angle, venting at junction.

Post your specific case with machine data and we will dig in.

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