Material Drying
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PET white haze six-step troubleshooting
Fenómeno del problema
PET preform white haze still appears intermittently after drying treatment
Análisis de la causa
Besides moisture, white haze has six causes: crystallization, degradation, too low mold temperature, material grade, and contamination; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solución
Troubleshoot in six steps: moisture, crystallization, temperature, degradation, contamination, and grade: measure moisture content, check melt temperature, check mold temperature, empty retained material, clean the machine, and verify with a batch change; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Conclusión clave
The six-step systematic troubleshooting method for white haze avoids single-path misjudgment; after confirming effectiveness, fix 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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