In recent years, with the increasing awareness of environmental protection, this method of flexographic printing is known and familiar to more and more people. At the same time, the flexible digital laser direct imaging technology has gradually become a hot topic. Regarding the current popular use of CDI (Cyrel Digital lmager), which is the direct plate-making technology, the quality control of each process in its entire production process is worthy of our joint discussion.
Compared with traditional flexo plate making, from the perspective of pre-press processing technology, the pre-press processing personnel who use the CDI plate-making process should have a very different focus. The advantage of the digital version (CDI printing plate) over the traditional printing plate is that on the same thickness of the printing plate, for the same thickness line and the same percentage of dots, the slope angle of the CDI printing plate support base is higher than that of the traditional About a dozen degrees. This result is shown on the printed matter, which makes the CDI printed matter have a smaller expansion rate than the traditional printed matter, the lines are clearer, and the thickness change is easier to control.
In the traditional version, if the thick and thin lines are thinner and the thin and thick lines are thicker during pre-press processing, the image level should be reduced by about 15%. The CDI plate making method is adopted, in principle, the thinnest male line is not less than 0.03mm, and the thinnest female line is not less than 0.08mm. In order to improve the printing durability and printability of the printing plate, the minimum dots on the printing plate should be 2% or more, and the minimum independent dot diameter should not be less than 0.15mm. Long single-color gradient, when encountering multi-color superposition and one or two color gradients to zero, it is best to mention the minimum dots at 2%, if it must be screened out, it should be as much as 2% ~ 0% This section is arranged in a uniform step and the range should not be too long. If you encounter a large area of ​​field gradation to a net, in most cases, this field is made into two versions to prevent the ink layer from being thick. During the specific processing process, you need to start gradation of the original color version on the original large color version It is retracted in a gradual manner on the basis of, and the retracted background color is hidden as far as possible from 60% to 70% of the original color, so as to avoid the phenomenon of sudden hard holes in the screen of the background color version. , And the original large color version tries to increase the minimum dot to 2%.
In addition, in the processing of pre-press trapping, some improvements can be made when using the CDI plate-making method. The trapping is mainly designed to compensate for the registration error of the printing press-but it also brings another undesirable result, that is, the original design scheme will be changed at a small place. For example: if there is a 0.15mm buckle at the junction of the magenta block and the blue block, a purple line with a width of approximately 0.15mm will be generated adjacent to the two color blocks. This is for some products with higher requirements. Will not accept. In the CDI process, we can use the advantages of the CDI printing plate to support the slope of the base and the edges of the printed lines to be clear, to adjust the thickness of the registration line of the entire set of color plates, that is, the registration line of the CPI version is used from the traditional 0.1 is deleted and improved to 0.05 ～ 0.07mm, at the same time, the buckle in the living piece can be adjusted to about 0.07 ～ 0.1mm.
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