Molds & Tooling
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ASA holding pressure and sink mark prevention
Fenómeno del problema
[Problem phenomenon] ASA thick wall rib sink marks, holding pressure setting improper
Análisis de la causa
ASA amorphous shrinkage 0.4-0.7% though small, thick wall areas still need holding pressure compensation; insufficient holding pressure sink marks, too high internal stress and demolding difficulty; during on-site investigation, verify item by item according to this mechanism, avoid blindly adjusting the machine based on experience alone
Solución
Holding pressure set at 50-70% of injection pressure; thick wall areas extend time; gate size ensures compensation channel; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Conclusión clave
ASA holding pressure 50-70% compensates sink marks, thick wall extended time without overpressure; 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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