Processing Machinery
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PMMA Solvent Cracking
Fenómeno do problema
PMMA products develop fine cracks after contact with alcohol
Análise das causas
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
Solução
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
Conclusão principal
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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