Material Drying
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PSU Melt Residence and Preheating Stability
Fenómeno del problema
[Problem Phenomenon] PSU continues molding after production interruption; product stability fluctuates
Análisis de la causa
Long-time high-temperature residence affects PSU melt decomposition stability; appropriate pretreatment (maintaining dryness, avoiding long-time high-temperature retention, brief preheating before injection) can maintain stability
Solución
Manage production interruptions by residence time; empty when exceeding the limit; briefly preheat the melt before restart; establish standard operations for shutdown and restart; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Conclusión clave
PSU residence time must be managed; interruption and restart follow standard operations to ensure stability; After confirming effectiveness, solidify the parameters and practices into the work instructions to prevent recurrence; Include this case in the defect archive as a reference for troubleshooting similar problems in the future
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