Material Drying
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PMMA Sheet Hot Bending Bubbles
Problem Phenomenon
Bubbles appear in the bending area when PMMA sheets are hot-bent
Cause Analysis
The sheet contains residual monomer and moisture, which precipitate into bubbles during heating and bending; 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
Preheat and dry sheets before hot bending; uniform heating temperature; bending area temperature not exceeding the upper limit; 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
Drying and preheating before hot bending are the prerequisites for bubble prevention; 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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