Injection Molding
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ASA Flow Mark Ripples
Fenómeno del problema
【Problem Phenomenon】Wavy flow marks on ASA product surface, uneven gloss
Análisis de la causa
The melt front cold film breaks to form flow marks; low mold temperature and too slow injection speed causing the front to cool too fast are the main causes; during on-site troubleshooting, verify item by item according to this mechanism, avoid blindly adjusting the machine based only on experience
Solución
Increase mold temperature and melt temperature; increase injection speed; enlarge runner and gate to reduce front cooling; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability; change only one variable at a time and record parameter changes to facilitate locating effective measures
Conclusión clave
ASA flow marks are the front condensation signal, raising temperature and speed improves; after confirming effectiveness, fix 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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