Production & Quality
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MP performance degradation after repeated processing
Problem Phenomenon
MP tensile strength decreases 25-30% after 3-4 recycling/reprocessing cycles
Cause Analysis
molecular chains break and degrade under repeated high-temperature shear; antioxidants exhausted in multiple processing; cumulative effect of thermo-mechanical degradation
Solution
1) recycled material ratio not exceeding 20-30%; 2) replenish 0.1-0.2wt% antioxidant at each re-extrusion; 3) lower processing temperature 5-10°C; 4) reduce screw speed to reduce shear
Key Takeaway
performance degradation from multiple processing is caused by thermo-mechanical degradation; limiting regrind and replenishing antioxidants are key
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