In the offset printing process, the so-called "water-drying" means that the blank portion of the printing plate fails to form a sufficient uniform water film, that is, the non-image portion of the printing plate is insufficient in water. Once the water dry plate phenomenon, it will result in a blank part of the dirty plates, thus affecting the quality of printed materials, ink-water balance that is out of control occurs during printing.
The control of ink balance is related to many factors, including the adjustment ratio of ink volume and water volume, the quality of dampening solution itself, the concentration of dampening solution, the amount and temperature of alcohol, the nature of the ink itself, the pressure of the ink roller, the ambient temperature and humidity. Wait.
If the amount of dampening solution and the amount of alcohol used in the printing process are correct, the reason for the plate "drying" may be that the ink supply roller and the water supply system water roller pressure are improperly set, and may also be used with the dampening solution used in the printing process. Quality related.
If the pressure between the inking roller and the printing plate of the ink supply system is set correctly, the phenomenon of "drying" still occurs, which may be caused by improper pressure setting between the water rollers in the water supply system. Insufficient pressure between the water rolls can easily lead to dry plate phenomenon. In addition, if there is oil on the water roller, it will also affect the water supply volume of the water roller, resulting in "water dry" failure of the plate layout.
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