Material Drying
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PET crystallization-drying integration
Fenómeno del problema
Amorphous PET chips are fed directly into the drying tower, agglomerate, block the material, and stop production
Análisis de la causa
Amorphous chips soften and stick in the high-temperature drying tower, and must be crystallized first to raise the softening point before drying; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solución
Use a crystallization-drying integrated machine or pre-crystallize first through a crystallizer; raise the temperature for drying only after the crystallinity reaches the standard; after adjustment, take consecutive samples to verify the effect, and resume mass production only after confirming stability
Conclusión clave
Crystallizing amorphous PET before drying is an iron rule; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for subsequent similar problems
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