Molding Process
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LLDPE film shrink film uneven shrinkage
Problem Phenomenon
The shrink film shrinks unevenly and wrinkles after heating.
Cause Analysis
Uneven orientation in the film (frost line/air ring asymmetry); improper shrink temperature.
Solution
①Uniform cooling and setting; ②adjust the shrink temperature curve; ③control blow-up ratio consistency.
Key Takeaway
Uneven shrinkage = uneven orientation.
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