Molds & Tooling
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PPO Internal Stress and Low Melt Temperature
Fenómeno del problema
[Problem Phenomenon] PPO products have large internal stress, deforming and cracking after storage
Análisis de la causa
Processing pure PPO with barrel temperature below 280°C easily produces high in-mold stress; the high-viscosity melt freezes quickly, sealing in orientation stress; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solución
Barrel temperature for pure PPO not lower than 280°C; hot mold at 110-150°C to reduce stress; post-process after molding according to procedures to relieve stress; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Conclusión clave
PPO internal stress is linked to melt temperature, and below 280°C is a stress-prone zone; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a reference for troubleshooting similar problems in the future
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