Injection Molding Burning Streaks/Silver Streaks

Injection Molding Burning Streaks/Silver Streaks Appearance Silvery or dark surface streaks and in exceptional cases black discolorations. Cause 1. Damage to the plastic melt due to excessively high temperatures or overlong residence times resulting from gaseous decomposition products. 2. High shear heating due to small gate cross sections or by sharp changes of direction in…