Processing Machinery
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Screw seizure of PET extruder
Fenómeno del problema
The screw cannot rotate (seizes) when restarting after a shutdown during PET processing.
Análisis de la causa
The material is not fully purged at shutdown; after cooling, PET crystallizes and solidifies between the screw and the barrel, locking the screw.
Solución
Before shutdown, purge and replace PET with purging material or PP; shut down after the barrel cools down; before startup, first heat to processing temperature and hold for 30min.
Conclusión clave
PET screw seizure is a serious equipment accident and can be avoided with standardized shutdown procedures.
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