Production & Quality
12 görüntüleme
EVOH Performance Degradation After Repeated Processing
Sorun Belirtisi
After 3-4 recycling and reprocessing cycles, EVOH tensile strength decreases by 25-30%
Neden Analizi
Molecular chains break and degrade under repeated high-temperature shearing; antioxidants are completely consumed during multiple processing cycles; cumulative effect of thermo-mechanical degradation
Çözüm
1) Recycled material ratio 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 decrease shear
Temel Çıkarım
Performance degradation from multiple processing is caused by thermo-mechanical degradation; limiting regrind and supplementing antioxidant is key
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