Material Drying
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TPU Silver Streaks from Moisture
Problembeschreibung
Silver filament-like streaks on the surface of TPU products
Ursachenanalyse
The vast majority of TPU silver streaks are caused by moisture, and elastomers are sensitive to hydrolysis; when troubleshooting on site, verify item by item according to this mechanism, avoiding blind machine adjustment based solely on experience; this mechanism has been repeatedly verified by industry materials and should be confirmed first during troubleshooting
Lösung
Measure moisture content below 0.02%; strengthen drying; if silver streaks persist, check shear heat; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability; change only one variable at a time and record parameter changes to facilitate locating effective measures
Wichtigste Erkenntnis
Ninety percent of TPU silver streaks are moisture problems; after confirming effectiveness, fix 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 later
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