Thermoforming
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PMMA Cooling and Setting
Problem Phenomenon
PMMA thermoformed parts spring back and deform after demolding
Cause Analysis
Demolding occurs before sufficient cooling and setting, and residual stress causes shape springback; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience; this mechanism has been repeatedly verified by industry literature and should be confirmed first during troubleshooting
Solution
Extend in-mold cooling time; control the temperature of the setting mold; use fixtures to assist setting after demolding; 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
Sufficient cooling and setting of thermoformed parts prevents springback; 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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