Material Drying
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PET startup pre-drying
Fenómeno del problema
Starting the machine after two days of shutdown, the first batch of preforms are all scrapped for white haze
Análisis de la causa
During the shutdown, the chips and equipment absorb moisture, and the machine is started without re-drying, so wet material is directly molded; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solución
Before startup, re-dry the material for more than 4 hours and test the moisture content; first empty the residual material in the barrel; mass production begins only after the first article passes inspection; after adjustment, take consecutive samples to verify the effect, and resume mass production only after confirming stability
Conclusión clave
Restarting after a shutdown must re-establish the drying state; 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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