20.6.14 Short Parts
The nished product is not completely formed.
Probable Cause:
1. Molding Machine
• Bad feed
• Low injection pressure
• Low injection speed
• Short injection time
• Back ow valve / check ring faulty
• Improper venting
2. Mold
• Insucient venting
• Cold mold
3. Material
• Low melt temperature
• Viscous material
Solution (in sequence):
1. Increase feed
2. Increase injection pressure
3. Increase feed temperature by increasing cylinder temperature
4. Increase injection time
5. Increase mold temperature
6. Increase nozzle diameter
7. Inspect for restrictions
8. Increase gate size of sprue and runner system
20-18
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