Among the four printing methods of flat concave and soft hole, only one method is obviously different from the other three printing methods on the principle of ink transfer. This is lithography, which is what we usually call offset printing.
The most basic printing principle in offset printing is to use the two rules of incompatibility of oil and water, and selective adsorption of the printing plate to keep the ink and water balanced on the printing plate to achieve the transfer of the dots, and to achieve clear images and full colors Effect. This is where the term ink balance is derived.
V. Analysis of the phenomenon of imbalance of ink and ink How to achieve ink and ink balance, the operator must not only understand and study the organic relationship between ink and ink, the constraints between each other and the rules of subtle changes between them, but also analyze and discuss the imbalance of ink Adverse consequences caused by time.
1 Analysis of the phenomenon that there is little water and little ink: In the printing process, there is a certain water film in the blank part of the printing plate. When the water film and the oil can contend, it will not be stained by the ink on the ink roller. If the amount of the water layer is too small to resist the adsorption of the ink on the blank part, the blank part will adhere to the ink, resulting in hanging dirt, and the amount of ink supply will make the printed matter dull, light gray, and the imprint is not true. The blots are covered with snowflake-like white dots. In this state, although the "water-ink balance" is also reached, this "water-ink balance" is not the "water-ink balance" we want.
2 Analysis of the phenomenon of less water and more ink: At this time, the ink color of the printed product is most likely to be uneven, hanging dirty, a certain part or a large layout is caused by water shortage, resulting in paste and paste. At the same time, the printed ink is darker. Makes the printed matter dark, the dots are not clear, especially for the reproduction of fine dots, the image is not clear.
3 Analysis of the phenomenon of less water and ink: If the water content of the plate is too large, it will gradually spread to all the ink roller surfaces to form a water layer of a certain thickness, which hinders the normal transfer of ink. The emulsification speed of the ink is accelerated, and the color of the printed ink is gradually unsaturated. The picture becomes lighter, the handwriting is dull, gray, hairy, hairy, and dull. There is a halo around the imprint, the image is not clear, and there are no layers.
4 Analysis of the phenomenon of large amount of water and ink: When the water content of the plate is excessive, the ink color will become lighter, and it will often blindly think that the amount of ink supply is small, so the amount of ink is continuously increased, and the long-term circulation back and forth, the ink emulsification loses stability, causing The vicious cycle of water-ink imbalance leads to serious emulsification of the ink, which accumulates on the surface of the ink roller, making printing impossible.
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