Mold-Masters Hot Runner - Warped Parts

20.6.19 Warped Parts
The nished product has pressure di󰀨erences / stress on its surface, causing
the part to be disgured.
Probable Cause:
1. Molding Machine
• Wrong cooling time
• High injection pressure
2. Mold
• Gate located in wrong area
• Undercuts too big
• Cavity too hot
• Part is wrong design or too heavy
3. Material
• Fillers have wrong orientation
• Incorrect material
Solution (in sequence):
1. Ensure temperature in both mold halves is equal
2. Monitor part ejection from mold for uniformity
3. Monitor part handling following ejection
4. Verify part weight following ejection
5. Increase injection hold time
6. Increase cooling time
7. Adjust injection pressure
8. Adjust mold temperature; set sequential temperatures based on part
geometry
9. Check gate dimensions, quantities and locations
10. Re-design part if necessary
20-23TROUBLESHOOTING
Hot Runner User Manual
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