Material Drying
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Bubbles from Insufficient PMMA Drying
Problem Phenomenon
Fine bubbles appear inside transparent PMMA parts, and optical parts are directly scrapped.
Cause Analysis
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.
Solution
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.
Key Takeaway
PMMA bubbles = drying one-vote veto item.
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