Extrusion & Post
13 visualizações
Rough surface of PVA extrusion
Fenómeno do problema
PVA extruded product surface roughness Ra>5μm exceeds the requirement
Análise das causas
Extrusion temperature on the low side <140°C, melt flow unstable; die inner wall rough or damaged; PVA melt elasticity causes uneven extrusion swelling
Solução
1) Raise extrusion temperature to 140-200°C; 2) Polish die inner wall to Ra<0.4μm; 3) Reduce extrusion rate by 10-15%; 4) Add 0.3-0.5wt% external lubricant
Conclusão principal
Rough surface is caused by low-temperature extrusion and die defects; raising temperature and polishing the die are the core countermeasures
Isto foi útil?
0 pessoas acharam isto útil
Obrigado pelo seu comentário!