Printing process for realizing matte effect through lithography and flexography

Abstract

The invention relates to a printing process for realizing a matte effect through lithography and flexography and belongs to the field of packaging and printing processes. The traditional offset printing press is generally provided with an online glazing unit with a flexography method; an initially dried or completely dried ink undercoat layer with lower surface tension is printed on a printing stock by using an offset printing process; and then an ink layer, of which the surface tension is 0.004-0.01 N / m larger than that of the undercoat layer, is printed on the undercoat layer by using the flexography method; when flexography ink is printed to the surface of the ink on the undercoat layer, the flexography ink layer is retracted because the surface tension of the flexography ink layer is larger than that of the undercoat layer, so that an obvious matte texture can be obtained after the flexography ink is cured. By controlling the surface tension difference between the undercoat layer and the wet flexography ink, the shrinkage degree of the flexography ink is controlled; and through the adjustments such as inking quantity adjustment and color adjustment, the thickness, color and matte sense of the whole matte effect can be rapidly adjusted.

Description

[0001] technical field [0002] The invention relates to a combined printing method of lithographic printing combined with flexographic printing, which realizes the frosting effect that only screen printing can achieve, and belongs to the field of packaging printing technology. Background technique [0003] Lithographic printing is a printing method that uses printing plates such as PS plate, plano gravure plate, multi-layer metal plate, albumen plate, and stone plate. The graphic part and the blank part are almost on the same plane, and the printing method is carried out by using the principle of incompatibility of oil and water. When printing, first apply a water film to the printing plate with a water roller, and the water forms a layer of water film on the blank part of the printing plate, while there is almost no water film on the graphic part. Then use the ink roller to apply ink to the printing plate. At this time, the blank part with the water film does not adhere t...

AI Technical Summary

Problems solved by technology

[0007] Products printed by lithographic printing and flexo printing have a thin ink layer, and the printed graphics and texts do not have a strong sense of three-dimensionality. Some graphics and texts that require strong texture and three-dimensional sense cannot be represented, especially some special matte effects cannot be realized.

Due to the deformation of the printing plate, the positioning accuracy of screen printing is not high, the lines are not fine enough, and due to the thick ink layer, the ink consumption is large, the ink is not easy to dry completely, and the volatile solvent residue in the ink layer is large, which will pollute the packaging to a certain extent. risk

In addition, the screen printing speed is slow, and the overall printing efficiency is not high

Images