How to master the "water-ink balance" is a difficult point in the offset printing process.
If the moisture is too small, the blank part will become dirty, and the water volume is too large, it will affect the printing quality.
The hazards of large water are as follows:
(1) Impede the normal transmission of ink, forming a hollow and false impression;
(2) The ink color of the product is uneven, especially before and after printing interruption;
(3) Increasing the deformation of the paper makes the image and text overprint inaccurate;
(4) Excessive paper absorption causes curling and uneven paper collection;
(5) Wet the roller pad paper or rust the roller shell;
(6) Due to the fading of ink color, the image is dry, the outline is unclear, and the color is old;
(7) The coloring power of the ink is reduced, and sometimes the amount of ink has to be increased, so that the dots become pasted and the layers are unclear, resulting in large water and ink;
(8) The color of the blot changes greatly, which causes color errors when compared with the signing;
(9) The printing gloss decreases, and the drying speed becomes slow;
(10) Accelerate the deinking of the ink roller, and the ink becomes larger, it will cause the plate to be dirty, and it will also make the back of the printed sheet sticky.
Therefore, under normal circumstances, the water-ink balance should maintain a minimum amount of water, but it cannot be mechanically specified. The amount of water consumption also depends on the speed of the machine, the graphic area of ​​the layout, the nature of the paper and the thickness of the printed ink layer.
The control of the water consumption of the layout should be based on the premise that the layout is not dirty. Whether the water storage of the layout can be correctly identified is a necessary condition for controlling the water consumption. Now, the identification of the amount of water is usually estimated empirically, and it needs to be explored repeatedly.
Here are some signs of excess water:
(1) Rolling "dots" of the lower ink roller and the water transfer roller accumulate water droplets;
(2) The blotting ink is light, it is not easy to deepen the ink color in time after adding ink;
(3) There is a lot of ink on the surface of the ink roller, but the ink color is not dark;
(4) Before and after the printing is interrupted, the ink color has a large gap;
(5) Compared with the original paper, the printed sheet is soft and weak;
(6) The edge of the paper is curled downwards, and the paper collection is uneven;
(7) Wavy void phenomenon occurs on the edge of the printed sheet and the large blank area;
(8) The rubber roller and plate cylinder pads are wetted by moisture;
(9) Various other phenomena of "big water and big ink".
Through daily observation and analysis, various phenomena of excessive water consumption can be found and controlled in time to ensure the quality of the printed products.
Author: Taixing City, Jiangsu Province friendship with Feng Yuan printing plant
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