Extrusion & Post
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LDPE Film Blocking
Problem Phenomenon
Two layers of the film roll stick together, bag opening is difficult, and there are white marks when torn apart.
Cause Analysis
Insufficient slip agent in LDPE film or insufficient blooming; large winding tension, high film temperature and high storage temperature aggravate blocking.
Solution
①Increase antiblock agent/slip agent; ②reduce winding tension; ③cool fully before winding; ④control warehouse temperature.
Key Takeaway
Blocking = joint treatment of additive + tension + temperature.
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