Processing Machinery
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PMMA Stress Whitening
Problem Phenomenon
PMMA products whiten at bent or impacted locations
Cause Analysis
Crazing in stress concentration areas scatters light and causes whitening; PMMA's high brittleness makes it more visible; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
Round structural corners; anneal to reduce stress; choose impact-modified grades for impacted areas; after adjustment, take samples continuously to verify the effect, and resume mass production only after confirming stability; change only one variable at a time and record parameter changes to facilitate locating effective measures
Key Takeaway
Stress whitening is a brittleness signal; reduce stress or modify; 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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