Molds & Tooling
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ABS nozzle drool
Problem Phenomenon
The nozzle drips during mold opening or waiting, and cold slug marks or stringing appear at the product gate.
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; low-viscosity grades of ABS are more prone to drooling.
Solution
①Reduce the nozzle temperature by 5~10℃; ②set suck-back to relieve pressure; ③replace the worn nozzle; ④use a needle valve nozzle when necessary.
Key Takeaway
For drooling, first lower the nozzle temperature and add suck-back; if ineffective, replace the nozzle.
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