Possible cause:
1. The temperature of the mold runner is too low;
2. The seal of the mold cavity inlet is damaged;
3. The copper nozzle of the shunt skin and the heat insulation cap are deformed
Solution
1. Appropriately increase the temperature of the runner;
2. Check and replace the cavity;
3. Replace the beryllium copper nozzle and heat insulation cap.
Dark spot
Possible cause
1. The raw material has impurities;
2. The injection temperature is too high;
3. The temperature of the hot runner is over-temperature;
4. There are debris in the hopper and the blanking port.
Solution
1. Replace qualified raw materials for production;
2. Lower the temperature of the sol cylinder;
3. Check the controllability of the mold temperature controller;
4. Check whether there are debris in the hopper and the
