Mold-Masters Hot Runner - Parts Sticking to Cavity

20.6.12 Parts Sticking to Cavity
The nished product does not properly release from the mold (female side).
Probable Cause:
1. Molding Machine
• High injection pressure
• High injection speed
• Long holding time
• High material feed
2. Mold
• Hot cavity
• Cold mold
• Defective mold surface
3. Material
• Melt too hot
Solution (in sequence):
1. Conrm cycle time for cooling
2. Reduce injection pressure
3. Reduce injection hold time
4. Reduce injection speed
5. Reduce injection time
6. Adjust feed
7. Inspect mold nish
8. Increase mold opening cycle
9. Lower mold temperature
10. Adjust di󰀨erential temperatures
11. Inspect for appropriate mold release
20-16
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