Production & Quality
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EEA performance degradation with repeated processing
Fenómeno do problema
EEA after 3-4 times of recycling and reprocessing shows tensile strength decline of 25-30%
Análise das causas
Molecular chains break and degrade under repeated high temperature and shear; antioxidant exhausted in multiple processing; cumulative effect of thermo-mechanical degradation
Solução
1) Recycled material proportion not exceeding 20-30%; 2) Supplement 0.1-0.2wt% antioxidant at each re-extrusion; 3) Reduce processing temperature by 5-10°C; 4) Reduce screw speed to reduce shear
Conclusão principal
Performance degradation from multiple processing is caused by thermo-mechanical degradation; limiting recycled material and supplementing antioxidant are the key
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