Extrusion & Post
13 visualizações
EVOH extrusion surface is rough
Fenómeno do problema
EVOH extruded product surface roughness Ra>5μm, exceeding requirements
Análise das causas
Extrusion temperature too low <190°C with unstable melt flow; die inner wall rough or damaged; EVOH melt elasticity with uneven extrusion swell
Solução
1) Increase extrusion temperature to 190-230°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
Surface roughness is caused by low-temperature extrusion and die defects; increasing temperature and polishing the die are core countermeasures
Isto foi útil?
0 pessoas acharam isto útil
Obrigado pelo seu comentário!