The scorch marks are the phenomenon of blackening which occurs at the end of the flow due to the inability of the gas in the cavity to be discharged in time.
First, the cause of the formation of scorch marks
1. Cavity air cannot be removed in time.
2. Material degradation
a. too high melt temperature;
b. too fast screw speed;
c. The flow channel system is not properly designed.
Second, the improvement method
Mold design
a. Add an exhaust system where it is prone to poor exhaust gas;
b. Increase the size of the main runners, runners, and gates.
2. Process conditions
a. reduce the injection pressure;
b. reduce the injection speed;
c. reduce the screw speed;
d. lower the barrel temperature;
e. Check if the heater and thermocouple are in a normal state.
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