Material Drying
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PMMA Plum Rain Season Management
Problem Phenomenon
The PMMA bubble defect rate doubles during the plum rain season
Cause Analysis
The high-humidity environment raises the moisture content of the raw material, leaving insufficient margin in conventional drying conditions; 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 drying by 2 hours during the plum rain season; increase the frequency of moisture content testing; dehumidify the material warehouse; 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
In high-humidity seasons, strengthen both drying and testing; 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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