Material Drying
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PMMA Bubbles Three Routes
Problem Phenomenon
Bubbles in PMMA products appear repeatedly and remain after drying
Cause Analysis
Bubbles have three routes of causes: moisture, degraded monomer, and entrapped air; treating only one route cannot cure the root; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
Identify by air shots: for water bubbles check drying, for degradation bubbles check temperature and residence, for entrapped air bubbles check back pressure and venting; after adjustment, take samples continuously to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Bubbles are systematically troubleshot by the three routes of causes; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a reference for troubleshooting similar problems in the future
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