Processing Machinery
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Missing Shutdown Purging Procedure for PEEK
Problem Phenomenon
[Problem Phenomenon] A barrel containing PEEK is shut down directly, and black speck carbonized material cannot be cleaned out for a long time at restart
Cause Analysis
PEEK residing at high temperature carbonizes and adheres to the barrel and screw, and continuously flakes off and contaminates at restart; Fast Heat explicitly prohibits shutting down with material in the barrel — the barrel must be thoroughly purged with hard HDPE until the droplets are free of PEEK residue
Solution
Fully purge the barrel and hot runner with hard HDPE before shutdown; discharging material by opening the mold is prohibited to prevent melt leakage from injuring people; confirm it is purged clean before shutting down and lowering the temperature
Key Takeaway
Shutting down with material in the barrel is a big taboo for PEEK — purging with HDPE is only complete when the droplets are clean; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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