Molding Process
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LDPE Film Weak Edge (Slitting Edge Burst)
Problem Phenomenon
After slitting, the film edge is serrated and tears easily and extends.
Cause Analysis
Blunted cutters and excessive slitting tension; when the film itself has high MD strength and weak TD (splitty), edge cracking is easier.
Solution
①Replace/sharpen cutters; ②adjust slitting tension; ③evaluate longitudinal-transverse stretch balance; ④adjust blow-up ratio and draw ratio.
Key Takeaway
Edge burst = cutter + tension + orientation balance.
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