Production & Quality
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DSTDP repeated processing performance decay
Problem Phenomenon
After 3-4 times of recycling and reprocessing, DSTDP tensile strength decreases 25-30%
Cause Analysis
Molecular chains break and degrade under repeated high temperature and shear; antioxidants 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 each re-extrusion; 3) lower processing temperature 5-10°C; 4) lower screw speed to reduce shear
Key Takeaway
Multiple processing performance decay is caused by thermo-mechanical degradation; limiting regrind and supplementing antioxidant are key
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