In the offset printing process, the water-ink balance is a dynamic balance, which changes all the time. How can we maintain the ideal water-ink balance? Be aware that there are many reasons that affect the balance of water and ink. During the printing process, even if the water conveying device is adjusted and operated correctly, due to the impact of the shutdown, the temperature and humidity of the printing workshop, the speed of the machine, the type of ink and paper Restrictions on the blank area of ​​the layout as the number of prints decreases and the hydrophilic property weakens, etc., will also directly affect the water-ink balance.
If you want to maintain the balance of ink and wash, you must achieve "two stability", "two quasi", "one moderate"
Erwen:
â‘ The temperature and humidity of the workshop should be stable, because the change of temperature will cause the change of the viscosity and fluidity of the ink. The increase in temperature will evaporate the water, which will make the water and ink lose balance.
â‘¡The printing speed should be stable. In production, the machine must maintain normal speed, and the machine will be slow and fast, which will easily make the water and ink balance out of control. The printing speed can directly lead to the quality of the printing quality, and our printing machine operators are very clear.
The second standard:
â‘ Accurately understand the characteristics of different types of paper, ink and other raw materials. The performance of ink and paper used in printing differs greatly, and the use of different papers and inks has different requirements for water-ink balance. If you buy offset ink, even if it is the same brand as the "Bauhinia" brand, the viscosity and fluidity of the ink are different for different series. Under the same conditions of printing plate, temperature, humidity, etc., we must accurately grasp the changes of their properties.
â‘¡ The pressure adjustment should be accurate. The printing press must have precise cylinder pressure, ink roller pressure and water roller pressure. These three pressures directly determine the water-ink balance. On the premise of ensuring that the printing plate is not dirty, the water supply volume is controlled to the smallest possible range, and the water supply volume and the ink volume are in a relatively stable state, so as to ensure the printed matter The ink color is consistent before and after and the printing operation is stable. Choose the ink size according to the type of printing material. The amount of water on smooth paper can be slightly smaller, the rough paper can be slightly larger, the machine runs faster, the amount of water can be smaller, and it can be larger at low speeds.
A modest:
The amount of drying oil should be moderate. Adding drying oil to the ink will accelerate the drying of the ink, but the drying oil will promote the viscosity of the ink. Therefore, the inappropriate amount of drying oil is an important factor that makes the water-ink balance out of control and the dirty version.
The above points are not only the requirements of the operating environment of the printing press, but also the requirements of the operator's sense of responsibility and carefulness and patience, but also the technical requirements of the operator.
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