Material Drying
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PPO Silver Streaks and Moisture
Problembeschreibung
[Problem Phenomenon] Silvery-white filamentary streaks on the surface of PPO products, uneven gloss, appearing in batches
Ursachenanalyse
Although PPO's water absorption is low, trace moisture forms silver streaks and a non-smooth phenomenon on the surface; insufficient drying, hopper moisture regain or wet regrind are the three major sources; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Lösung
Fully dry to 0.02% moisture content and verify; check hopper sealing and regrind drying; redry the silver-streaked material and verify in a small batch; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Wichtigste Erkenntnis
Ninety percent of PPO silver streaks are moisture; drying verification plus hopper management work with two prongs; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a reference for troubleshooting similar problems in the future
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