Material Drying
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PET rainy season drying
Problem Phenomenon
In the plum rain season, the PET white haze defect rate rises several-fold
Cause Analysis
High environmental humidity raises the initial moisture content of the chips and increases the load on the dryer, leaving insufficient margin under conventional conditions; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
In the plum rain season, extend drying by 1-2 hours and increase the frequency of moisture content testing; dehumidify the workshop and material warehouse; increase the frequency of dew point monitoring; after adjustment, take consecutive samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
In high-humidity seasons, both the drying standard and the monitoring frequency are upgraded; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for subsequent similar problems
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