In the gravure printing process, the color of the luminous ink (Glow in the dark ink) often has a deviation problem, which affects the appearance of the finished product. 

So, today let us summarize five reasons for your reference.

1. The amount of ink is inconsistent.

That is to say, the amount of luminous ink in the ink tank of the printing machine is different, which also causes the viscosity of the ink to be different in different periods. Note that the viscosity change of luminous ink is often affected by the temperature change of the printing environment.

2. The color of luminous ink is different

To solve the problem of color difference of gravure luminous ink on plastic film, it is necessary to select gravure luminous ink with stable quality and small color shift or deviation. For printed matter, it is best to use luminous ink produced by a certain manufacturer, and for a batch of printed matter, it is best to use the same batch of luminous ink produced by the same manufacturer.

3. If the luminous ink circulation is not smooth, there will also be a problem of chromatic aberration.

Take care to keep the luminous ink circulating smoothly. It is best to use the ink circulation system to ensure the convenience of adding thinner and adding new ink to keep the good quality and flow of the luminous ink.

4. The printing speed is inconsistent with the drying speed of the luminous ink.

The printing speed and the drying speed of the luminous ink also directly affect the ink absorption rate of the printed matter. Therefore, changes in the printing speed and the drying speed of the luminous ink will cause the color of the luminous ink on the printed matter to change.

Image from internet

5. Improper use of scraper.

The position of the squeegee, the angle of the squeegee, the pressure of the squeegee and the pressure of the impression cylinder have a great influence on the color of the luminous ink, especially the color of the luminous ink in the shallow part.

Image from internet

If you are producing luminous ink, welcome to learn more about luminous powder (Glow in the dark powder), and related ink ingredients: pigment yellow 12, pigment red 57:1 and other pigments, or related ink resin: polyamide resin, chlorinated polypropylene and other luminous ink resin.