Material Drying
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PCABS Moisture Silver Streak Characteristics
Fenómeno del problema
[Problem Phenomenon] PC/ABS has silver-white hairline streaks randomly distributed over the entire surface, accompanied by water splash
Análisis de la causa
Characteristics of moisture-type silver streaks: randomly distributed over the entire surface, hairline-shaped, and splash-shaped in severe cases; PC hydrolysis also causes molecular weight decline and a sharp drop in impact strength; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solución
Immediately verify moisture content; if exceeding the standard, re-dry at 100-120°C for 3-4h; check hopper moisture regain and dryer dew point; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Conclusión clave
Moisture silver streaks are randomly distributed hairlines over the entire surface; drying re-testing is the first action; 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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