Material Drying
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PET vacuum drying application
Problem Phenomenon
rPET bottle flakes dried with ordinary dehumidifying drying suffer large IV loss, and the products turn yellow
Cause Analysis
rPET bottle flakes have a large specific surface area and have already had one thermal history, so high-temperature hot-air drying superimposes oxidation and hydrolysis, and IV is lost quickly; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
rPET uses vacuum drum drying, dehydrating in a 130-150℃ low-oxygen environment; or a vented extruder is selected for direct processing; after adjustment, take consecutive samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
rPET drying requires low temperature and oxygen isolation, and vacuum drying is the preferred choice; 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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