The printing process has to go through pre-press, printing and other technological processes. Among them, the three processes of printing film, printing and printing will have a great impact on the deformation of the dots of the printed matter. This article focuses on the analysis of the reasons for the deformation of the dots so that control measures can be taken in time in production.
1. Film development: The process of film development includes RIP film development, photo-exposure film exposure, processing and inspection. Poor linearization of the hair film will lead to changes in line drawing, too dark printing effects, picture color deviation, poor layer reproduction, dirty layout, on-the-spot false, high and low-key dot level loss and other phenomena.
2. Exposure: The data in the computer outputs the film through the film machine. After the exposure, the dots will be lost, and the dots will become smaller and appear rough around the dots. In the actual production, the photo printing plate is prone to the halo and untrue of the PS version of the dots, the printing color is unstable, the highlights are seriously lost, the printed images are not moist, and the flat screen is not equal. The ability of the printing plate to express the tone is generally between 3% and 97% (when the number of screen lines is 1751Pi), due to the light scattering during exposure, the loss of the highlight tone and the dark tone is severe, and it is inevitable that the mid-tone dots are small. phenomenon.
3. Printing: The printing link has the most obvious influence on the dots. Due to the complicated printing process, it is more difficult to control the conditions. You can understand the impact on the dot changes through the following factors. One is that ink affects the transfer of dots. The ink is squeezed between the printing plate and the blanket, and then squeezed between the blanket and the paper. The ink layer formed is usually very thin. If the ink layer is thick, dots will occur. The problem of expansion; the second is that the reduction of the dots needs the effect of the ink roller pressure, which directly affects the transfer of ink. Therefore, it is very important to adjust the working pressure of the ink roller correctly.
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