Production & Quality
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Performance Decay of CMC After Repeated Processing
Problem Phenomenon
After 3-4 recycling and reprocessing cycles, the tensile strength of CMC decreases by 25-30%
Cause Analysis
Molecular chains break and degrade under repeated high-temperature shearing; antioxidants are exhausted in multiple processing; cumulative effect of thermo-mechanical degradation
Solution
1)Recycled material ratio not more than 20-30%; 2)Supplement 0.1-0.2wt% antioxidant in each re-extrusion; 3)Reduce processing temperature by 5-10°C; 4)Reduce screw speed to reduce shear
Key Takeaway
Performance decay after multiple processing is caused by thermo-mechanical degradation; limiting regrind and supplementing antioxidant are the key
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