Extrusion & Post
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Metallocene linear low density polyethylene film poor printability
Problem Phenomenon
The printing ink adhesion on the film surface is poor, and printed patterns fall off or become blurred.
Poor printability affects product appearance and affects product quality in printed packaging films.
Cause Analysis
（1） Metallocene linear low density polyethylene has low surface energy （<32dyn/cm）, poor ink wettability\
（2） Film surface treatment insufficient （corona treatment not enough）\
（3） The film surface has exudates （slip agent, anti-blocking agent migration）\
（4） The ink does not match the film\
（5） Printing environment humidity improper
Solution
（1） Perform corona treatment to increase the film surface tension to 38-42dyn/cm\
（2） Control the corona treatment power and treatment time, ensure uniform treatment\
（3） Control additive dosage to avoid excessive exudation\
（4） Select an ink type that matches the film\
（5） Control the printing environment humidity at 50-60%
Key Takeaway
Poor printability is caused by low surface energy, requiring corona treatment to increase surface tension to improve ink adhesion.
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