Production & Quality
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POE repeated processing performance decay
Fenómeno del problema
POE after 3-4 times of recycling and reprocessing, tensile strength drops 25-30%
Análisis de la causa
Molecular chains break and degrade under repeated high-temperature shear; antioxidant exhausted in multiple processing; thermo-mechanical degradation cumulative effect
Solución
1) Recycled material ratio no more than 20-30%; 2) Supplement 0.1-0.2wt% antioxidant at each re-extrusion; 3) Lower processing temperature 5-10°C; 4) Lower screw speed to reduce shear
Conclusión clave
Performance decay from multiple processing is caused by thermo-mechanical degradation; limiting regrind and supplementing antioxidant are key
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