Extrusion & Post
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Longitudinal stripes on EVA extruded film
Fenómeno del problema
Continuous stripes 1-3mm wide along extrusion direction on EVA extruded film surface
Análisis de la causa
Local damage or uneven gap at die lip; unstable flow in melt stagnation zone inside die; pressure fluctuation at screw front end
Solución
1) Check die lip flatness and gap uniformity within ±0.01mm; 2) Clean die interior to remove carbonized material in stagnation zones; 3) Install gear pump on extruder to stabilize melt pressure; 4) Polish die lip to Ra<0.1μm
Conclusión clave
Longitudinal stripes are caused by die defects and pressure fluctuation; die maintenance and pressure stabilization are key
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