What if the injection molded products are burnt during injection molding?
Scorch marks refer to the phenomenon of blackening at the end of the flow because the gas in the mold cavity cannot be discharged in time.
Causes of coke marks:
1. The cavity air cannot be discharged in time
2. Material degradation
a. Excessive melt temperature
b. Too fast screw speed
c. Improper design of runner system
Improvement method:
1. Mold design
a. Add an exhaust system where poor exhaust is easy to occur
b. Increase the size of sprue, shunt and gate
2. Process conditions
a. Reduce injection pressure
b. Reduce injection speed
c. Reduce the screw speed
d. Reduce barrel temperature
e. Check whether the heater and thermocouple are in normal state.
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