Second mold aspect:
(1) The demoulding structure is unreasonable or improperly positioned. (2) The draft is not sufficient. (3) The mold temperature is too high or the ventilation is poor. (4) The surface of the sprue wall or cavity is rough. (5) The nozzle does not conform to the feed port of the mold or the diameter of the nozzle is larger than the diameter of the feed port.
Three process aspects:
(1) The barrel temperature is too high or the injection volume is too much. (2) The injection pressure is too high or the pressure is maintained and the cooling time is long.
Four raw materials: insufficient lubricant.
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