air trap issue

What is Burn marks troubleshooting

Burning marks, or dieseling defects, This defect will often show up as black, gray, or brown discoloration on the part surface. This is the result of gasses and volatiles getting trapped, compressed, and heated in the mold during injection. This gas will burn the front of the polymer flow front by the high injection pressures and speed. Burning marks normally occur at the end of fill, or the flow ends, such as the end of the ribs or deep ribs area., we call gas traps, venting defects as well.

Burn marks defects

Cause and solutions

The mean reason to cause the Burn marks […]