Processing Machinery
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Screw seizure of PCTG extruder
Problem Phenomenon
Screw cannot rotate when restarting after shutdown.
Cause Analysis
PCTG not purged at shutdown; cooling crystallization locks the screw.
Solution
Purge PCTG with PP before shutdown; fully heat before restarting.
Key Takeaway
PCTG screw seizure is caused by improper shutdown operation.
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