Material Drying
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PMMA Drying 70-100℃×8h
Problembeschreibung
Bubbles and silver streaks appear on PMMA product surfaces, and optical quality of transparent parts fails to meet standards
Ursachenanalyse
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
Lösung
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
Wichtigste Erkenntnis
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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