Processing Machinery
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PEEK Black Speck Contamination Troubleshooting
Problembeschreibung
【Problem Phenomenon】Black speck impurities are scattered on white PEEK products, still appearing intermittently after cleaning
Ursachenanalyse
Raw material contamination, carbonized material residue in equipment, or foreign matter mixed into regrind are the three major sources; PEEK's high temperature carbonizes trace contaminants making them visible, so troubleshooting must cover the whole chain
Lösung
Check the cleanliness of raw material and regrind; thoroughly clean the barrel, screw, and hot runner to find carbonization dead corners; troubleshoot cross-contamination of auxiliary equipment (dryer, conveying); after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Wichtigste Erkenntnis
PEEK black specks are a whole-chain test; check raw material, equipment, and auxiliary machines in three lines in parallel; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for similar problems in the future
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