
20.6.17 Streaks
The finished product has large, dull and laminate appearance areas on the
surface.
Probable Cause:
1. Molding Machine
•
Back flow valve ring damaged
2. Mold
• Hot spots
• Material trapped in certain areas
3. Material
• Contamination of resin or machine
• If pattern is identical, cause may be the machine
• If pattern is erratic, cause may be the material or coloring
• Degraded or unstable material
Solution (in sequence):
1. Check for contamination
2. Check barrel purging
3.
Inspect back flow ring for wear or cracks
4. Inspect feed screw for wear and tear
5. Inspect screw / barrel for tolerances
6. Verify heater operation
7. Verify thermocouple operation
20-21
TROUBLESHOOTING
Hot Runner User Manual
© 2020 Mold-Masters (2007) Limited. All Rights Reserved.
Summary of Contents for Hot Runner
Page 1: ...Hot Runner User Manual Hot Runner User Manual version 31 Original Instructions...
Page 2: ......
Page 95: ......
Page 318: ......