Molds & Tooling
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ASA nozzle cold slug prevention
Problem Phenomenon
[Problem phenomenon] ASA nozzle cold slug enters cavity forming cold slug spots
Cause Analysis
When nozzle temperature is lower than the melt front section, condensation at the outlet forms cold slug; when the mold has no cold slug well or insufficient cold slug well, cold material enters the cavity; during on-site investigation, verify item by item according to this mechanism, avoid blindly adjusting the machine based on experience alone
Solution
Nozzle temperature matched with or slightly higher than front section; mold set with sufficient cold slug wells; when mold opening interval is long, nozzle retracts to prevent drooling; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Key Takeaway
ASA cold slug spots check nozzle temperature and cold slug well capacity; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for subsequent similar problems
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