Material Analysis
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Performance decline after the use of PLA recycled material
Fenómeno del problema
After adding recycled material, the impact strength and transparency of PLA products drop significantly.
Análisis de la causa
PLA is sensitive to heat history, and the molecular weight decreases after multiple processing; the lactic acid produced by degradation lowers the pH value and catalyzes further degradation.
Solución
Control the recycled material ratio ≤20%; fully dry the recycled material; add a chain extender to restore the molecular weight.
Conclusión clave
PLA is sensitive to heat history, and recycling management is particularly important.
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