Processing Machinery
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PE Film Splitty and Weak Edges
Problem Phenomenon
PE film tears very easily in the machine direction, the transverse (TD) strength is low, and the serrated film edges after slitting easily extend and break.
Cause Analysis
Too small blow-up ratio and too large draw-down ratio cause excessive machine-direction molecular orientation, weakening the TD strength; improper frost line height also aggravates the orientation imbalance; dull slitting knives and excessive tension cause weak edges.
Solution
①Increase the blow-up ratio and reduce the draw-down ratio to balance the machine and transverse orientation; ②optimize the frost line height; ③select wider molecular weight distribution or higher TD strength grades; ④replace/sharpen the slitting knives and adjust the tension; ⑤verify the machine and transverse tear strength.
Key Takeaway
PE film splitting = 'orientation imbalance', and the core is adjusting the matching of the blow-up ratio and draw-down ratio; weak edges are a knife and tension problem—do not confuse the two and adjust the process randomly.
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