Extrusion & Post
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Poor printability of polyolefin plastomer films
Problem Phenomenon
The printing ink adhesion on the film surface is poor, and the printed pattern falls off or blurs.
Poor printability affects the product appearance and affects product quality in printed packaging films.
Cause Analysis
（1）The polyolefin plastomer has low surface energy (<32dyn/cm) and poor ink wettability
（2）The film surface treatment is insufficient (corona treatment is not enough)
（3）There are precipitates on the film surface (migration of slip agents and anti-blocking agents)
（4）The ink does not match the film
（5）The printing environment humidity is 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 to ensure uniform treatment
（3）Control the amount of additives to avoid excessive precipitation
（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, and it is necessary to increase the surface tension through corona treatment to improve ink adhesion.
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