Material Drying
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PMMA Raw Material Storage
Problem Phenomenon
After PMMA pellets are stored open for one month, bubbles increase
Cause Analysis
PMMA stored open for a long time accumulates moisture absorption, causing the moisture content to exceed the standard; 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
Store raw materials sealed; use immediately after opening; verify drying of overdue material before use; 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
Sealed storage of PMMA raw materials is a basic requirement; 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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