Molds & Tooling
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ABS nozzle drool and cold slug marks
Problem Phenomenon
The nozzle drips during mold opening or waiting, and cold slug marks, stringing, or foggy small spots appear at the gate of the next shot.
Cause Analysis
The nozzle temperature is too high, the back pressure is too large, or the nozzle orifice is worn and enlarged, so the melt flows out by itself after plasticizing, forming drool; the flowed-out cold material is carried into the cavity in the next shot, forming cold slug marks; too small a cold slug well also makes them appear repeatedly.
Solution
①Reduce the nozzle temperature by 5~10℃; ②set suck-back to relieve pressure; ③replace the worn nozzle; ④enlarge/add a cold slug well; ⑤check whether the nozzle heater band is normal.
Key Takeaway
ABS drool and cold slug marks often have the 'same source': for drool, first lower the nozzle temperature and add suck-back; cold slug marks rely on the cold slug well to catch the front cold material; both point to nozzle temperature and cold material management.
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