Processing Machinery
3 조회수
Missing Shutdown Purging Procedure for PEEK
문제 현상
[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
원인 분석
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
해결 방법
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
핵심 요약
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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