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1, the ink drying is bad. If the ink is dried too fast, it will cause the phenomenon of early conjunctiva formation in the ink layer, and the ink may be unevenly colored and the paste may be damaged during printing. This is mainly due to the excessive use of dry oil in the ink and the excessive drying of air humidity. For the above reasons, the ink is crusted on the ink roller, and an appropriate amount of dry oil can be added to suppress the drying speed.
2. The discoloration of the ink on the printed page causes poor coloration. Due to the poor pigment performance of the ink, inferior organic pigments are used, or heterogeneous pigments are used in combination, so that a chemical reaction causes discoloration, and this ink is not suitable for color printing.
3, printing layout pale ink. If too much ink is added to the ink or the detackifier is added, and the water content of the plate is too large, the sensory quality of the printing plate graphic portion will be reduced, and the ink color of the printing product will be faded. In this regard, the ink should be re-adjusted, that is, adding some of the original ink to the thin ink, so that the concentration of the ink is increased; the moisture of the printing plate is reduced to improve the coloring power of the ink.
4, the back of the printed product is dirty. When the printed version of the printing ink is thick, or when the amount of the auxiliary agent is not properly adjusted, the drying speed of the ink is reduced, and the back surface becomes dirty, and a certain amount of desiccant and release agent can be added to the ink. To eliminate the back of the prints dirty phenomenon.
5, layout ink lacks gloss. Due to the poor texture of the varnish, the insufficient amount of varnish, and the excess water on the plate, the printing ink layer will lack luster. For color printing products, bright ink can be used for printing, or an appropriate amount of brightener can be added to the ink to increase the gloss of the printed ink layer.
Carton preprint quality problems explain seven
Seven, printing quality problems caused by bad ink :