Molding Process
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LDPE Film Longitudinal Splitting (Splitty)
Problem Phenomenon
The film tears very easily along the longitudinal direction, and TD strength is low.
Cause Analysis
Too small blow-up ratio and too large draw ratio cause excessive longitudinal molecular orientation; improper frost line height also aggravates it.
Solution
①Increase the blow-up ratio; ②reduce the draw ratio; ③optimize frost line height; ④select grades with wider molecular weight distribution.
Key Takeaway
Longitudinal splitting = orientation imbalance; adjust the blow-up ratio.
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