Processing Machinery
3 Aufrufe
Screw seizure of PET extruder
Problembeschreibung
The screw cannot rotate (seizes) when restarting after a shutdown during PET processing.
Ursachenanalyse
The material is not fully purged at shutdown; after cooling, PET crystallizes and solidifies between the screw and the barrel, locking the screw.
Lösung
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.
Wichtigste Erkenntnis
PET screw seizure is a serious equipment accident and can be avoided with standardized shutdown procedures.
War das hilfreich?
0 Personen fanden dies hilfreich
Vielen Dank für Ihr Feedback!