20.6.18 Stringing
The nished product has thin plastic strings attached to the sprue.
Probable Cause:
1. Molding Machine
• High back pressure
• High nozzle temperature
2. Mold
• Incorrect sprue
3. Material
• Melt strength inadequate
Solution (in sequence):
1. Reduce back pressure
2. Modify nozzle temperature
3. Modify temperature prole
4. Eliminate sprue breaks
5. Increase cooling time
6. Decrease mold temperature at the gate
20-22
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Hot Runner User Manual
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