Processing Machinery
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PET regrind ratio 25%
Problem Phenomenon
After the regrind ratio becomes too high, product strength decreases, color drifts, and batches are unstable
Cause Analysis
The regrind's IV has already decreased after experiencing thermal history, and an excessively high ratio dilutes the virgin material performance; batch fluctuations in color and molecular weight are amplified with the regrind ratio; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
①The regrind ratio generally does not exceed 25%; ②use the regrind after thorough drying; ③reduce the regrind ratio or prohibit it for critical performance parts; after adjustment, take consecutive samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
25% is the general upper limit for PET regrind; the three managements of drying, ratio, and application grading stabilize the use value of regrind; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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