Production & Quality
14 visualizações
PU repeated processing performance degradation
Fenómeno do problema
After 3-4 times of recycling and reprocessing, the tensile strength of PU decreases by 25-30%
Análise das causas
Molecular chains break and degrade under repeated high-temperature shearing; antioxidants are consumed up in multiple processing; cumulative effect of thermo-mechanical degradation
Solução
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 reduce shearing
Conclusão principal
Multiple processing performance degradation is caused by thermo-mechanical degradation; limiting regrind and supplementing antioxidants are key
Isto foi útil?
0 pessoas acharam isto útil
Obrigado pelo seu comentário!