Inking amount is inconsistent
In other words, the viscosity of the ink in the ink tank of the printing press is different at different times, and the amount of the ink is different. In the whole process of gravure printing, the relative stability and consistency of ink viscosity should be maintained. Note that the viscosity of the ink changes, often affected by the temperature change of the printing environment.
The selected ink colors are different
To solve the problem of difference in color of gravure ink on plastic film, it is necessary to select gravure ink with stable quality, color deviation or small deviation. For a variety of printing, it is best to use inks from a certain manufacturer, and a batch of printed products, it is best to use the same batch of inks from the same manufacturer.
Ink circulation is not smooth
Pay attention to keep the ink circulation smooth, it is best to use an ink circulation system to ensure the convenience of adding diluent and adding new ink, to maintain ink with good quality and fluidity.
Printing speed and ink drying speed are inconsistent
The speed of printing and the speed of ink drying directly affect the inking rate of the printed matter. Therefore, changes in the printing speed and the drying speed of the ink will cause the change of the color of the ink on the printed matter.
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 greater influence on the color of the ink, especially the color of the ink in the shallow layer.
Different composite processes
Different composite processing techniques, heat sealing of the bag's wide-edge welding, compounding with different colors of composite inner film, or direct vacuum aluminum plating after printing, also have a certain effect on the color of the printed matter.
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