Extrusion & Post
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Poor Printability of High-Density Polyethylene Film
Problembeschreibung
The adhesion of printing ink on the film surface is poor, and the printed pattern falls off or is blurred.
Poor printability affects the product appearance and affects product quality in printed packaging films.
Ursachenanalyse
（1）The surface energy of high-density polyethylene is low (<32dyn/cm), and the ink wettability is poor
（2）The film surface treatment is insufficient (the 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
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 additive dosage to avoid excessive precipitation
（4）Select an ink type that matches the film
（5）Control the printing environment humidity at 50-60%
Wichtigste Erkenntnis
Poor printability is caused by low surface energy, and the ink adhesion needs to be improved by increasing the surface tension through corona treatment.
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