Material Drying
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Bubbles from Insufficient PMMA Drying
Fenómeno del problema
Fine bubbles appear inside transparent PMMA parts, and optical parts are directly scrapped.
Análisis de la causa
PMMA easily absorbs moisture, and moisture-laden pellets vaporize into bubbles at the barrel temperature; transparent parts have zero tolerance for bubbles, and a small amount of moisture can make them visible.
Solución
①Dry at 80~90℃ for 2~4 hours, reducing the moisture content below 0.05% (stricter for optical parts); ②Dehumidifying drying and verification; ③Seal after drying to prevent rehumidification; ④Section-check the first article for bubbles at startup.
Conclusión clave
PMMA bubbles = drying one-vote veto item.
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