Production & Quality
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Performance decay of EVA with repeated processing
Problem Phenomenon
After 3-4 recycling and reprocessing cycles, EVA tensile strength declines 25-30%
Cause Analysis
Molecular chains break and degrade under repeated high temperature shear; antioxidant exhausted in multiple processing; cumulative effect of thermo-mechanical degradation
Solution
1) Recycled material ratio not exceeding 20-30%; 2) Supplement 0.1-0.2wt% antioxidant at each re-extrusion; 3) Lower processing temperature by 5-10°C; 4) Lower screw speed to reduce shear
Key Takeaway
Performance decay from multiple processing is caused by thermo-mechanical degradation; limiting recycled material and supplementing antioxidant are key
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