Material Drying
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ABS over-drying oxidation yellowing
Fenómeno del problema
[Problem phenomenon] To pursue thorough drying, the drying time is extended, and ABS pellets turn yellow and discolored instead
Análisis de la causa
ABS drying exceeding 6 hours causes thermal oxidation at high temperature; butadiene phase oxidation leads to yellowing and performance decline; drying temperature and time must be balanced, not the longer the better
Solución
Drying time controlled at 3-4h not exceeding 6h; temperature 80°C is appropriate, do not exceed 85°C; yellowed material is downgraded for use or scrapped; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Conclusión clave
ABS drying is not the longer the better; exceeding 6 hours causes oxidative yellowing; 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 subsequent similar problems
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