Material Drying
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PET drying time management
Problem Phenomenon
To rush output, the PET drying time is compressed from 6 hours to 3 hours, and the white haze defect rate soars
Cause Analysis
PET drying is a process of moisture diffusing from inside the pellet to the surface; 3 hours can only remove the surface moisture, and the moisture in the core still exceeds the standard; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
The drying time must not be less than 4 hours, with 6 hours as the standard; to rush output, the dryer capacity should be increased rather than the time compressed; after adjustment, take consecutive samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Drying time is the physical lower limit of moisture diffusion and cannot be compressed; 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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