Flexo printing has its own characteristics and advantages. Flexographic printing uses water-based inks or alcohol-based inks that are environmentally friendly, not harmful to the human body, and is particularly suitable for foods. Pharmaceutical product packaging, liquid milk packaging, most of the use of flexographic printing. Secondly, the narrow-width flexographic printing press can increase screen printing units and complete on-line processes such as die-cutting, embossing and hot stamping, which improves production efficiency and reduces production costs. Once again, customers nowadays have very strict requirements on the consistency of the packaging color (especially the color of the field). The flexographic printing can be almost the same as the first printing, ensuring the stability of the packaging.
Therefore, flexographic printing is gradually being accepted by customers. In the past few years, several hundred flexographic printing production lines have been introduced domestically; at the same time, the application of flexographic printing has also led to the development of the flexographic platemaking industry. However, there are many reasons for the late start of domestic flexo plate making. The difficulty in flexographic prepress processing is one of the main reasons. If flexographic prepress processing is performed by offset or gravure plate printing, the printed proofs will have many problems, such as darkening of color, loss of gradation, loss of highlights, or hard edges.
In prepress processing, originals can be divided into line drawings and mesh rephrasing according to the situation. Line drafts are also called outline drafts and contain text, lines, and field information. Modifications are relatively easy, but pay attention to the smallest text in the test prints. And the finest line size, do not exceed this size when handling. In addition, due to the effect of pressure during printing, the lines may become thicker, and a certain amount of compensation must be given during production. Individual thin lines will bend when the pressure is too large to ensure that their width is not less than 0.1mm. The mesh remastering is an image or a pattern containing a hierarchy, and many factors need to be taken into consideration during production. The process of rephrasing is the core part of prepress processing, and the issue of increasing the number of printing outlets must be fully taken into account when making the plate.
With the traditional plate making method, 1% of the dots are not stable in the production process and are easily lost. Therefore, the minimum dot formed on the plate is 2%, and 2% dots will increase to 10% after printing. The smallest dot on the proof sheet is 10%, and the dots below 10% cannot be printed. At this time, the following methods can be used to skillfully avoid and solve.
(1) Ignore some levels without affecting the printing effect, even if the network is less than 2%.
(2) Change all highlights below 2% to 2% outlets. Because the human eye feels relative to the color, in some cases it will create an illusion that 2% of the dots will be treated as highlights.
(3) Replace a certain color with other colors, such as black substitute for blue in food packaging, black substitute for red in leaf printing, or dark color with light color in the same hue.
The above method is actually a network where 10% or less is lost in printing. With the advancement of technology, the new network technology combining FM network and AM network developed by Esko Graphics has alleviated the problem. The adoption of FM outlets in the high-light areas of the image (1% to 3% of outlets) just solved the problem that 1% outlets on the flexo could not be saved. In addition, many companies have introduced new types of computer-to-plate machines, which can produce 1% of outlets through different exposure methods and can print out 10% or less of outlets, but the printing plate is not resistant to printing force, and the number of times the printer has to replace printing plates More. In short, due to too many and varied interference factors in the printing environment, the pre-press processing staff should comprehensively consider various factors, so that the flexographic version can meet the printing requirements to the maximum extent, and ultimately obtain the ideal print.
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