Molds & Tooling
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ASA nozzle cold slug prevention
Fenómeno del problema
[Problem phenomenon] ASA nozzle cold slug enters cavity forming cold slug spots
Análisis de la causa
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
Solución
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
Conclusión clave
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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