Molds & Tooling
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PMMA Multi-Cavity Transparency Inconsistency
Fenómeno del problema
Products from each cavity of a multi-cavity mold have inconsistent transparency and stress levels.
Análisis de la causa
Imbalanced runners and cooling among cavities cause different filling shear and cooling rates; hot runner temperature differences also change the melt state of each cavity.; During on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based on experience alone.
Solución
①Balance runners and cooling; ②calibrate hot runner temperatures at each point; ③test optical indicators cavity by cavity; ④optimize process by cavity position.; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability.
Conclusión clave
The balance requirement of optical multi-cavity molds is higher than for ordinary parts; cavity-by-cavity optical testing is a direct means to verify balance.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.
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