Injection Molding
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PA6 '2079851475616104452 Weld Line Whitening
Fenómeno del problema
Confluence lines turned white, obvious on dark parts.
Análisis de la causa
Cold front + gas and impurity enrichment; the reflection characteristics at the confluence differ from the matrix; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience; during troubleshooting, confirm item by item around key factors such as weld lines and whitening to avoid misjudgment.
Solución
①Raise temperature;②open or clean vent grooves at corresponding positions to ensure smooth gas discharge;③set an overflow well at the confluence to lead the cold front out of the cavity;④adjust gate position/quantity to change the material flow direction and confluence position;⑤increase injection speed to maintain melt front temperature and improve filling.
Conclusión clave
PA6 white weld lines = 'cold front': raising temperature, venting, and overflow wells are the three axes; for appearance parts, weld lines must be hidden or eliminated; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence.
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