The application of UV ink can be divided into two categories, namely: UV printing ink and UV printed circuit board ink. At present, UV printing inks used in the printing industry are used in various printing fields such as offset printing, relief printing (including flexographic printing), gravure printing, screen printing, and inkjet printing, while UV printed circuit board inks are mainly used in circuit boards in the electronics industry. (Referred to as PCB) printing.
1. Offset UV ink
The offset printing adopts UV ink, which can eliminate powder spraying, which is conducive to the cleaning of the printing environment, and avoids the troubles caused by powder spraying to post-press processing, such as the effect on glazing and laminating effects, and can be connected machining.
UV ink can also prevent the ink from peeling, which solves the worries when the offset press is stopped, and at the same time can increase the drying speed. Especially in packaging and printing, it is often necessary to print a large area on the ground and require a higher density, so it has to increase the amount of ink, then the problem of ink drying becomes very important, often because the ink is not easy to dry and affect printing Productivity. With UV inks, this problem is solved.
UV inks are brightly colored and have excellent abrasion resistance, making them ideal for packaging and book cover printing.
UV ink has no penetration during curing, and can be printed on non-absorbent printing materials, such as card printing, etc. This is an area that ordinary offset inks cannot enter.
In addition, offset UV inks are also widely used in bill printing such as direct mail and business forms. In foreign countries, the biggest market for UV inks is offset UV inks.
2. Letterpress UV ink
Topographic printing UV ink is mainly used for label printing, but also for packaging printing, such as tube printing.
In flexographic printing, especially narrow-width flexographic printing, people pay more attention to less downtime and downtime, stronger abrasion resistance, and better printing quality. Products printed with UV ink have high dot definition, small dot increase, and bright ink color, which is a grade higher than printing with water-based ink. UV ink has broad development prospects.
At present, most flexographic printing machines are equipped with UV curing devices, and there are many types. [next]
3. Gravure printing UV ink
In the field of gravure printing, UV inks have been used selectively, but the technology and cost have also been increased accordingly. With the increasing call for environmental protection and the stricter requirements for the safety of packaging and printing products, especially food packaging, UV ink will become a development trend of gravure printing inks.
4. Screen printing UV ink
The advantage of UV ink in screen printing is very obvious. Because it can only be cured under UV light, it will not cause a headache to block the screen on the screen, and the curing speed is fast, which solves the troubled silk Contradiction between the long-time blocking in the screen printing industry and the drying speed of ink.
The ink layer of screen printing is thick, and it is difficult to dry. Without a drying device, it is difficult to accumulate and collect printed materials, and it is very difficult to achieve high-speed printing. With UV ink, all this is solved. For example, in the printing of optical discs, all UV inks are used, which improves the production efficiency.
The use of some decorative UV ink printing in screen printing can produce some special effects and realize the decoration of the printed surface. These special effects are difficult or impossible to achieve by other printing methods, and can only be achieved by screen printing + UV ink. At present, the commonly used UV inks are the following types: screen printing UV imitation metal etching ink, screen printing UV wrinkle ink, screen printing UV coral ink, screen printing UV ice flower ink, screen printing UV refractive ink, screen printing UV crystal grain ink Wait.
In addition, the combination of screen printing and gravure printing, flexographic printing, offset printing units, etc. is currently a trend in the development of printing presses, and screen printing units must use UV inks. [next]
5.UV inkjet ink
In addition to the UV ink mentioned above, a new type of ink-UV inkjet ink is also very worthy of attention. A new type of flat-panel inkjet printer using piezoelectric nozzle technology is strongly promoting the application of UV curing technology in inkjet inks. In addition, piezoelectric nozzle technology is also used today in hybrid printers and stand-alone machines. These new areas using inkjet inks provide a development opportunity for UV inks and are expected to reach the existing scale of screen printing.
The advantage of UV inkjet ink is that it not only has the economic and technical advantages of traditional UV technology, but also has its outstanding advantages in use and operation, mainly reflected in the following points.
(1) No volatile organic compounds;
(2) Low energy requirements;
(3) Fast curing;
(4) Suitable for various soft and hard substrates;
(5) The UV lamp will not cure before irradiation;
(6) No clogging of the nozzle, no need to clean the nozzle;
(7) The ink composition is stable;
(8) Good print quality and resistance, such as friction resistance, water resistance, light resistance;
(9) No waste of ink.
Therefore, UV inkjet inks are currently developing very fast, and there is a tendency to replace traditional inkjet inks.
6.UV printed circuit board ink
In the production process of circuit boards, there is a part called printed circuit board. The UV inks used for printed circuit boards are mainly: UV inks for corrosion resistance (including plating resistance), UV inks for solder masks and UV inks for character marking, which are all printed by screen printing.
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