12.5.20 Weld Lines
The finished product has lines where two flow fronts meet and have not
fused, creating the possibility of weak areas and stress fractures.
Probable Cause:
1. Molding Machine
• Low injection speed
• Low injection pressure
• Short injection time forward
2. Mold
• Low mold temperature
• Poor venting
•
Back flow valve / check ring malfunctioning
• Gates too far apart
• Redesign part
3. Material
• Cold melt
• Material wrong grade for application
Solution (in sequence):
1. Increase injection pressure
2. Increase injection holding time
3. Increase injection speed
4. Increase cylinder temperature
5. Increase mold temperature
6. Check for venting
7.
Provide an overflow well adjacent to the weld area
8. Modify the gate location
9. Decrease gate land length
12-24
TROUBLESHOOTING
FSG2 User Manual
© 2020 Mold-Masters (2007) Limited. All Rights Reserved.
Содержание Fusion G2
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