20.6.9 Jetting
The nished product exhibits serpentine ow patterns on the surface as a
result of the melt cooling prior to complete lling of the mold.
Probable Cause:
1. Molding Machine
• High injection speed
2. Mold
• Cold mold
• Small gate
• Wrong gate land length
• Wrong gate location
3. Material
• Cold melt
Solution (in sequence):
1. Decrease injection speed
2. Verify nozzle temperature
3. Increase mold temperature
4. Increase melt temperature
5. Increase gate size
6. Modify gate location
20-13TROUBLESHOOTING
Hot Runner User Manual
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