Material Drying
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TPU Regrind Use
Problem Phenomenon
After blending regrind, the toughness of TPU products decreases and color drifts between batches
Cause Analysis
The heat history of TPU regrind reduces molecular weight; performance cumulatively deteriorates after multiple cycles; an excessively high regrind ratio dilutes the performance of virgin material; hydrolysis sensitivity makes regrind need drying even more
Solution
①Control the regrind ratio within 20%; ②use regrind after full drying; ③reduce the ratio or prohibit use for load-bearing parts; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
TPU regrind management gives equal weight to ratio and drying; the 20% upper limit plus full drying ensures stable performance; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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