Extrusion & Post
14 visualizaciones
EVOH extruded film thickness uniformity is poor
Fenómeno del problema
EVOH extruded film transverse thickness deviation ±15%, exceeding the ±5% industry standard
Análisis de la causa
Unreasonable die flow channel design causing uneven melt flow in the wide die; EVOH melt elasticity large with uneven extrusion swell; uneven air ring cooling
Solución
1) Adopt coat-hanger die design to ensure uniform transverse flow; 2) Fine-tune die gap ±0.02mm; 3) Optimize air ring air volume and angle for uniform cooling; 4) Add a small amount of low-elasticity resin to reduce swell differences
Conclusión clave
Film thickness uniformity requires coordinated optimization from die design, gap adjustment, and cooling
¿Le ha resultado útil?
0 personas encontraron esto útil
¡Gracias por sus comentarios!