12.5 Troubleshooting Typical Problems
12.5.1 Dark Specks
The finished product contains dark specks. Usually occurs when transparent
resins are used.
Probable Causes:
1. Molding Machine
•
Off-line for extended period
•
Barrel off-line for extended period
• Barrel improperly purged
• Contamination in plasticizer
• Wrong nozzle
• Use of wrong screw
2. Mold
• Gate and / or runner has dead spots
3. Material
• Physical contamination of raw material
• Chemical contamination of raw material
• Particulate contamination from machine barrel
Solution (in sequence):
1. Purge system with appropriate material
2. Trace source of contamination and repair, remove or discard
3. Adjust melt temperature if necessary
4.
Inspect for dead spots: gates, runners, nozzle, back flow valve
5. Inspect feed screw for degradation
12-5
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TROUBLESHOOTING
FSG2 User Manual
Содержание Fusion G2
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