First of all, in terms of prepress processing, many customer orders are mainly offset or gravure printing. If this manuscript is completed by flexographic printing, the proofs often have many quality problems, such as the color is not in place. The layers are not obvious, and hard edges appear. Therefore, in order to solve such problems, it is necessary to communicate with customers in a timely manner.
Secondly, the choice of flexographic plate materials must also be compared. Printing companies need to fully discuss issues such as the use of plate materials, the production of screen plates, the transition of levels, the increase of dots, and the expansion and contraction of printing plates by cooperating with many well-known platemaking companies, and summarize these data Formulate standards to provide reference for daily production. Such data management is not only conducive to production, but also can control the quality parameters, avoid human interference, and reduce the occurrence of production failures.
Again, due to the particularity of label printing, narrow-width flexographic printing equipment has outstanding features compared to relief printing and other types of flexographic printing equipment. Narrow-width flexographic printing equipment is not only simple to operate, but also has high printing quality and efficiency High, and strong combination, which means that you can make more kinds of products, more competitive.
Good equipment also needs correct operation and reasonable maintenance in order to make it play its best role. In the use of narrow-width equipment, the biggest obstacle encountered is not a technical problem, but a technical problem.
1. Ink is not dry and easy to fall off
For the problem of poor ink drying, the solution is to use a 9kW UV drying device, which is easier and faster to dry than a 2kW lamp. In case of the problem that the ink is easy to fall off, it should be analyzed together with the ink supplier and the raw material supplier. If the adhesion of the ink is not good, additives can be added. If the adsorption performance of the printing material surface is not good, corona treatment is required.
2. Static electricity
Static electricity is a problem often encountered in production. Especially when printing labels, it is necessary to install a full set of static elimination devices on the equipment, and strictly control the temperature and humidity of the workshop. Especially when printing in-mold labels and film label products, the printing effect of removing static electricity and dust is better.
3. Scraping effect is not good
During the flexographic printing process, the squeegee and the anilox roller are synchronously driven, which is prone to the occurrence of knife wire, that is, there are traces of ink pulled out on the printed label. On the ground, there are places where the color is lighter than the surrounding color. It is necessary to adjust the scraper to the best angle. In the choice of squeegee, most of the blades of imported squeegee have been treated by carbon burning, and the effect of squeegee is better. The reason for the appearance of ink marks may be that the ink itself is prone to bubbles, and the marks are formed on the anilox roller. At this time, it is necessary to add some additives.
4. Ink bar
There are ink sticks on the label, which are often the gears and teeth on the plate cylinder and the impression cylinder are not round, or there are impressions on the printing plate. At this time, the plate cylinder gear needs to be replaced.
5. Number of screens
From the perspective of printing screen lines, the maximum number of offset and gravure lines is higher than that of flexographic printing. The ideal screen lines for flexographic printing are about 150 lines / inch. If it exceeds 175 lines / inch, the flexographic version will increase The difficulty of plate making and printing, especially when the field and the screen are on the same plate, the amount of ink on the field is large, which is easy to cause the anilox roller to block ink and other failures, and also shorten the life of the printing plate. In addition, in screen processing, flexographic printing is completely different from offset printing and gravure printing. The dots of offset printing and gravure printing can be gradually reduced to zero, while flexographic printing can only achieve a minimum of 2%.
The development of the label market provides a stage for the development of flexographic printing technology. The improvement of flexographic printing quality, the reduction of costs, and the increase of process flexibility have promoted the development of the flexographic printing market. With the development of UV technology, increased awareness of environmental protection, shortened equipment maintenance time, users' acceptance of UV flexographic printing technology has gradually increased. At the same time, users also pay more and more attention to the combination of various printing processes to meet the diversified needs of the label market, which leads to and promotes the emergence and development of narrow-web rotary printing processes.
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