Molding Process
3 visualizações
DSTDP extruded film thick edges and thin middle
Fenómeno do problema
DSTDP extruded film edges 20-30% thicker than the middle, thickness showing a U-shaped distribution
Análise das causas
Improper die flow channel design, edge resistance low and flow large; DSTDP melt elasticity swells more at the edges; air ring cooling has different edge effects
Solução
1) Adopt coat-hanger die design to balance middle and edge resistance; 2) fine-adjust die gap, slightly larger in the middle and slightly smaller at the edges to compensate; 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 differences; coat-hanger die and gap fine adjustment are key
Isto foi útil?
0 pessoas acharam isto útil
Obrigado pelo seu comentário!