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Poor Printability of Polypropylene Film
Fenómeno del problema
The adhesion of printing ink on the film surface is poor, and the printed pattern falls off or is blurred.
Poor printability affects product appearance and affects product quality in printed packaging films.
Análisis de la causa
(1) The surface energy of polypropylene is low (<32dyn/cm), and the ink wettability is poor
(2) The surface treatment of the film 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
Solución
(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%
Conclusión clave
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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