Problem:
Weld lines are fromed when separate melt fronts travelling in different directions meet. Weld lines can be visible and or reduce part strength.

Solution:

1. Increase the injection speed.
2. Increase the hold pressure.
3. Increase the melt temperature.
4. Optimise hold pressure switch over point.
5. Ensure adequate venting in the region of the weld line.
6. Increase the mold temperature.
7. Investigate moving the gate point.
8. Change masterbatch check compatability.
   

 ImtechDesign.com 

Moldflow Consulting