At present, most of the printing machines used by carton printing enterprises are multi-color water-based printing and slotting machines, which often encounter the problem of low overprint rate. The post-printing color cannot completely cover the previous color, and pitting occurs, which seriously affects the printing effect and causes waste of cardboard. This phenomenon is particularly noticeable when printing large areas on the ground. How to improve the overprint rate of water-based ink? Below is a brief discussion.
Speed ​​up the drying speed of the first color ink on the substrate
1) When printing with a four-color printing and slotting machine, set the two inks that need to be superimposed on the first color group and the last color group, so that the drying time of the first color ink layer can be appropriately increased, which is beneficial to the overprint rate Improvement.
2) Use quick-drying ink as much as possible in the printing of the first color, which can speed up the penetration and fixation of the first color ink. Of course, it cannot be dried too fast, otherwise the ink has already dried on the anilox roller, affecting the transfer of ink.
3) Pay attention to the arrangement of printing color sequence, print the color with the smaller graphic area as much as possible, and then print the color with the larger graphic area. The advantage of this is that the area of ​​the first-color printed graphics and text is small, and it dries relatively quickly, which is conducive to the overprinting of ink; at the same time, because of the small area of ​​graphics and text, it can also reduce the number of color groups on the ink layer during the transfer of the cardboard. The chance of rubbing.
4) Under the premise that the color saturation satisfies the requirements, the thickness of the ink layer of the first color is reduced as much as possible, which is conducive to the drying of the first color and can also increase the ink overprint rate.
Adjust the relationship between the fluidity and viscosity of the two inks
Although water-based ink is soluble in water, in order to reduce the saturation of the ink or increase its fluidity during printing, water can be used for dilution, but water dilution is not the best method. For carton printing that requires bright colors, it is best to use stabilizers to lighten the color of the ink, which is conducive to the drying of the ink, and the auxiliary agent can improve the gloss of the ink layer. After dilution with water, when the ink adheres to the paperboard, it cannot be dried instantly. It must be allowed to dry for a while, which will reduce the edge pressure strength and compressive strength of the paperboard.
In addition, adjust the relationship between the viscosity of the first color and the post-printing color. For multi-color printing, the viscosity of the water-based ink of the first color should be appropriately reduced, so as to increase the viscosity of the ink of the second color to increase the overprint rate.
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