◆ Common Causes
- •Insufficient draft or undercuts
- •Excessive hold pressure (part grips the cavity)
- •Rough or damaged mold surface
- •Insufficient ejection or release agent
- •Improper mold temperature
◆ Solutions
- ✓Add draft; remove undercuts
- ✓Reduce hold pressure
- ✓Polish mold surface (in the draw direction)
- ✓Apply release agent; check ejectors
- ✓Adjust mold temperature
◆ Resin-Specific Notes
PC
Tacky; tends to stick to the core. Draft and polish matter.
TPU
Soft and tacky. Manage release agent and cooling.
PMMA
Surface tack. Manage polish and release conditions.
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This content is a field-reference summary. Final judgment requires on-site engineer verification.