Problem:

Burn marks. Air and gasses in front of the flow front cannot escape due to insufficient venting and are compressed via the incoming melt to the point of ignition.

Solution:

1. Reduced injection speed.
2. Reduce injection pressure.
3. Improve venting in the area of the burn mark.
4. Decrease melt temperatures in case of degradation..
5. Calibrate thermocouples and check band heaters.

 ImtechDesign.com 

Moldflow Consulting