Injection Molding
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PPO Holding Pressure Ratio
Fenómeno del problema
【Problem Phenomenon】PPO holding pressure is set improperly, and sink mark and internal stress problems alternate
Análisis de la causa
PPO holding pressure is generally 40%-60% of injection pressure; too low means insufficient feeding and sink marks, too high means internal stress and demolding difficulty; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based solely on experience
Solución
Set holding pressure at 40-60% of injection pressure; sink mark parts take the upper limit, stress-sensitive parts take the lower limit; holding pressure time is determined by gate freezing; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Conclusión clave
PPO holding pressure is 40-60% of injection pressure; take the value by weighing sink marks versus stress; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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