Molds & Tooling
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ABS cold slug mark
Problem Phenomenon
Foggy, pox-like small spots appear near the gate on the product surface, inconsistent with the gloss of the matrix.
Cause Analysis
The cold material at the front end of the nozzle or runner is carried into the cavity and does not fuse with the new melt; too small a cold slug well or too low nozzle temperature is the main cause.
Solution
①Enlarge/add a cold slug well; ②increase the nozzle temperature; ③shorten the contact time between the nozzle and the mold; ④check whether the nozzle heater band is normal.
Key Takeaway
The antidote for cold slug marks is the cold slug well + nozzle temperature.
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