Material Drying
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PPO Transparent Grade Optical Defects
Fenómeno del problema
[Problem Phenomenon] PPO transparent parts are turbid with flow lines, optical quality not up to standard
Análisis de la causa
Transparent PPO/PS grades (Noryl TN300 type) are sensitive to drying and melt cleanliness; moisture and degradation directly affect light transmission; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solución
Dry transparent grades strictly and measure actual moisture content; control melt temperature to prevent degradation; high mold polishing with venting; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Conclusión clave
For PPO transparent parts, cleanliness is transparency; both drying and temperature are strict; 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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