Material Drying
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PMMA Bubble Causes Three Routes
Problem Phenomenon
Bubbles inside or on the surface of products; effects vary after adjusting drying, holding pressure, and hot bending processes
Cause Analysis
Water bubbles formed by moisture vaporization, vacuum bubbles caused by insufficient shrinkage compensation at thick wall centers, and thermal bubbles produced by excessive hot bending temperature—the three bubble types have completely different causes and countermeasures
Solution
①Sufficient pre-drying at 80-90℃×3-4h to reduce water bubbles; ②optimize holding pressure shrinkage compensation for thick-walled parts; ③lower heating temperature and control time for hot bending; after adjustment, take samples continuously to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Classify PMMA bubbles first and then take measures; drying, holding pressure, and hot bending temperature correspond to three rectification routes respectively; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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