Extrusion & Post
7 visualizações
POE extrusion film thick edges and thin middle
Fenómeno do problema
POE extruded film edges 20-30% thicker than the middle, thickness in U-shaped distribution
Análise das causas
Improper die flow channel design, edge resistance low and flow large; POE melt elasticity causes greater swell at the edges; air ring cooling has different edge effects
Solução
1) Adopt coat-hanger design for the die to balance middle and edge resistance; 2) Die gap fine adjustment, middle slightly larger and edges slightly smaller for compensation; 3) Slightly reduce air ring edge air volume; 4) Add restrictor bar to adjust edge flow
Conclusão principal
U-shaped thickness is caused by die flow channel and swell difference; coat-hanger die and gap fine adjustment are key
Isto foi útil?
0 pessoas acharam isto útil
Obrigado pelo seu comentário!