Molding Process
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LDPE Film Weak Edge (Slitting Edge Burst)
Fenómeno del problema
After slitting, the film edge is serrated and tears easily and extends.
Análisis de la causa
Blunted cutters and excessive slitting tension; when the film itself has high MD strength and weak TD (splitty), edge cracking is easier.
Solución
①Replace/sharpen cutters; ②adjust slitting tension; ③evaluate longitudinal-transverse stretch balance; ④adjust blow-up ratio and draw ratio.
Conclusión clave
Edge burst = cutter + tension + orientation balance.
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