Extrusion & Post
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Poor printability of polyolefin plastomer films (Variant: Enhanced Measures)
Problembeschreibung
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.
In particular, additional attention is needed on the original basis; this problem is more prominent and requires focused attention.
Ursachenanalyse
（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
（6）On the original basis, additional attention is needed: fluctuations in process parameters or changes in equipment status have aggravated this problem
Lösung
（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%
（6）And strengthen process monitoring; on the original basis, additional attention is needed to pay special attention to parameter stability
Wichtigste Erkenntnis
Poor printability is caused by low surface energy, and it is necessary to increase the surface tension through corona treatment to improve ink adhesion.
Targeted preventive measures need to be taken in different production scenarios.
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