Material Drying
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PET online moisture monitoring
Problem Phenomenon
Drying abnormalities can only be found after white haze appears on the products, by which time the loss has already been caused
Cause Analysis
Offline sampling inspection lags behind, and during dryer failures large amounts of wet material flow into molding; 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 materials and should be confirmed first during troubleshooting
Solution
Install an online moisture meter at the drying outlet linked to an alarm; automatically cut off the material supply when abnormal; after adjustment, take consecutive samples to verify the effect, and resume mass production only after confirming stability; change only one variable at a time and record the parameter changes, so as to locate effective measures
Key Takeaway
Online monitoring turns white haze defects from after-the-fact into before-the-fact 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 troubleshooting reference for subsequent similar problems
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