Material Drying
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PET yellowing segmented location
Problem Phenomenon
PET products yellow; the drying and molding links blame each other
Cause Analysis
Both drying over-temperature and melt retention cause yellowing; the responsible link needs to be located in segments; 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 data and should be confirmed first during troubleshooting
Solution
Take dried chips and air-shot melt separately to compare hue: yellow chips indicate a drying problem, yellow melt indicates a molding problem; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Segmented sampling comparison of yellowing locates the responsible link in one go; after confirming effectiveness, fix 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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