Material Drying
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PMMA Drying 70-100℃×8h
Fenómeno do problema
Bubbles and silver streaks appear on PMMA product surfaces, and optical quality of transparent parts fails to meet standards
Análise das causas
PMMA water absorption at room temperature is about 0.3%; after pellets absorb moisture, the moisture vaporizes in the 200-250℃ melt; ordinary barrels must be fully dried, vented barrels can be appropriately relaxed, and damp pellets inevitably produce surface defects
Solução
①For ordinary barrels, pre-dry pellets at 70-100℃ for up to 8 hours; ②for sheet types 80-90℃×3-4 hours; ③vented barrels can skip pre-drying
Conclusão principal
PMMA drying duration is differentiated by equipment type; 70-100℃×8h is the conservative standard for ordinary barrels, vented barrels are the exception; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.
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