Extrusion & Post
14 visualizações
TPU extrusion melt fracture
Fenómeno do problema
Sharkskin-like lines appear on the surface of the extrudate.
Análise das causas
Melt fracture occurs when the shear rate of the melt through the die is too high; low temperature and small gaps aggravate it; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solução
①increase die temperature; ②widen the die gap; ③reduce extrusion speed; ④evaluate processing aids; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Conclusão principal
Melt fracture is a manifestation of shear instability; temperature and gap adjustment can alleviate it; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for similar problems later
Isto foi útil?
0 pessoas acharam isto útil
Obrigado pelo seu comentário!