Injection Molding
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PMMA High Injection Pressure Requirement
Fenómeno del problema
Thin-walled parts are underfilled with short shots, and weld lines are clearly visible, affecting appearance
Análisis de la causa
PMMA has poor flowability and high viscosity, usually requiring high injection pressure; thin-walled and long-flow-path parts require even more pressure, and slow injection may be needed to ensure flow quality
Solución
①Set higher injection pressure according to the poor flowability characteristic; ②slow injection for optical parts to reduce visible weld lines; ③holding pressure for 2-3 minutes for thick-walled parts; after adjustment, take samples continuously to verify the effect, and resume mass production only after confirming stability
Conclusión clave
PMMA's high viscosity determines the high-pressure slow-speed tone; weld line control of optical parts relies on low-speed filling coordinated with gate design; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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