Material Drying
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TPU Regrind Use
Fenómeno del problema
After blending regrind, the toughness of TPU products decreases and color drifts between batches
Análisis de la causa
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
Solución
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
Conclusión clave
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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