Material Drying
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PET recycled bottle flake drying
Problem Phenomenon
Recycled bottle flakes are dried under virgin-material conditions, and the product IV and strength still fail to meet the standard
Cause Analysis
The bottle flakes have already had one thermal history and have high moisture content, so conventional drying both makes it difficult to dehydrate in place and aggravates IV loss; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
Appropriately extend the bottle flake drying time and combine it with vacuum; determine the regrind ratio according to the final product IV requirements; apply solid-state polycondensation when necessary; after adjustment, take consecutive samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Recycled '2079851475616104451 must take into account both dehydration and IV retention, and solid-state polycondensation is a remedial means; 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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