Processing Machinery
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PMMA Solvent Cracking
Problem Phenomenon
PMMA products develop fine cracks after contact with alcohol
Cause Analysis
Solvents such as alcohol penetrate stress concentration areas, inducing environmental stress cracking (ESC); during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
Products avoid contact with alcohol solvents; reduce internal stress in molding and anneal; use special reagents for cleaning; after adjustment, take samples continuously to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PMMA ESC prevention requires avoiding solvents plus reducing stress; 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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