Material Drying
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PET moisture absorption storage management
Fenómeno del problema
PET pellets are used several days after the bag is opened, and bubbles appear even though the drying time remains the same
Análisis de la causa
PET continues to absorb moisture after the bag is opened, and the storage environment humidity determines the amount of re-absorbed water; the original drying time is set for fresh material and is no longer sufficient for re-moistened material; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solución
①Store sealed after opening and record the exposure time; ②extend the drying time for re-moistened material; ③manage raw material in grades according to storage conditions; after adjustment, take consecutive samples to verify the effect, and resume mass production only after confirming stability
Conclusión clave
PET raw material management must account for moisture absorption; exposure time recording plus graded drying brings the storage variable into process control; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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