As early as the last century, UV varnish has become the first choice for varnish due to its high gloss, instant drying and good friction resistance. However, due to the large difference in chemical composition and chemical properties of UV varnish and ordinary ink , The incompatibility of the two results in poor adhesion between ordinary ink and varnish. In addition, the initial high gloss of the printed glazing product is not long after printing, and the gloss loss phenomenon occurs, resulting in uneven gloss of the printed product. The dark area with a large ink coverage area has the greatest gloss loss, and the coverage The areas with small areas or no printing ink are still very bright. If the ordinary ink is completely dried before glazing, then the UV glazing effect is very good. Ordinary inks need to be dusted in order to prevent the back side from rubbing during the drying stage, and dusting will make the surface of the printed sheet that should be bright and smooth appear sand-like, which affects the appearance of the printed product after glazing. Later, the water-based glazing oil is used for glazing online and the dusting is reduced as much as possible, the effect is better. However, if the printed sheet needs to be fed twice in the printing press, the cost will increase and the efficiency will decrease. In order to overcome this shortcoming, printing machinery manufacturers have developed printing machines with double glazing units. When the paper is fed in the printing machine once, two glazing units print two layers of varnish on the common ink. First print a layer of water-based varnish to cover the common ink layer, and then print UV varnish to make it have high gloss. Since water-based varnishes are difficult to fully dry, the true drying of water-based varnishes requires coalescence of the acrylic emulsion in the varnishes. To speed up its drying on the printing press will inevitably cause other problems.
Although some prints use this kind of glazing effect very well, it is still difficult to face a wide variety of prints. In recent years, some ink manufacturers have developed a mix of ordinary ink materials and cured materials. Put a UV lamp in front of the UV coating unit to dry and fix the mixed ink. After UV coating, a high gloss is formed on the surface of the printed product. A mixed ink. It is a kind of mixed ink combining common materials and UV curing materials. When using it, put a UV lamp at the end of the printing unit and in front of the UV glazing unit to completely cure the mixed ink. The specific varnishing effect depends on the type of UV varnish, printing material and varnishing device used, but when the mixed ink is combined with the UV varnish and cures well, you will get a uniform and bright print. Compared with ordinary ink, the characteristics of mixed ink have many advantages: mixed ink printing combines the characteristics of UV light curing and traditional offset materials, so that the ink can maximize the characteristics of UV ink after UV light curing. The key to this process is the UV light curing technology. The high-energy UV lamp instantly cures the mixed ink between the printing press and the glazing device. This instant curing greatly reduces energy consumption, reduces production, storage and processing costs, and improves production efficiency. The mixed ink does not require the use of UV, the ink uses special ink roller, blanket and fountain solution. In this way, the printing factory uses mixed ink when it needs online glazing, and prints with ordinary ink when it does not need glazing. Mixed inks are printed in the same way as normal inks. Different rollers and blankets may have different effects when used with mixed inks. Printed with mixed ink, the gloss will not fade after UV coating, it is especially suitable for printing with high ink hiding power.
The printing performance of the mixed ink on the printing press is also like ordinary ink. The ink-water balance of UV inks is generally difficult to control, but mixed inks are similar to ordinary inks, and it is not difficult to control the water-ink balance. The printing characteristics of UV inks, such as dot gain, overprinting and printing contrast, are not as good as ordinary inks, and mixed inks are similar to ordinary inks. In addition, because the UV curing material in the mixed ink is not dried before the UV lamp is irradiated, the mixed ink is always flowing on the printing press, so it will not cause skin failure on the ink roller like ordinary ink and cause printing failure. Printing with mixed inks achieves instant drying, so it can be UV-lined on the press without the use of water-based glazing oil. The printing quality is no less than that of ordinary offset inks. The mixed ink has a wide application range and low investment. For printing plants that already have UV technology, they only need to buy mixed inks; for printing plants that have not yet used UV technology, in addition to buying mixed inks, they only need to invest in UV curing equipment and UV lamps. In addition to being mainly used for paper printing, mixed ink can also be used for non-absorbent printing materials such as plastic, aluminum foil, and metal paper. It has good adhesion to plastics. Using UV curing technology, the ink drying problem of non-absorbent printing materials is solved. The mixed ink prints out clear dots, which improves the quality of offset printing. The mixed ink can be used not only for sheet-fed printing presses but also for narrow-web printing presses. Mixed inks are now more and more used to print products that require good gloss, such as photo albums, posters, cards, folding cartons, pharmaceutical and cosmetic packaging boxes, etc.
Attention should be paid when printing with mixed ink: at least one UV lamp should be installed after the last printing unit and before the UV coating unit. According to the speed of the printing press and the hiding power of the ink, a UV lamp can be added to prevent the ink from drying completely. A glazing device is also required, and a certain number of UV lamps are installed on the rear of the printing press At printing speed, UV varnish can fully cure. There are many possibilities for the configuration of the printing press. The most typical one is to install a UV lamp before and after the glazing unit. Although lamps are generally not required between printing units, some manufacturers find that installing UV lamps between printing units has certain advantages. Mixed inks can also be glazed with water-based glazing oils.
Some printing houses have found that this process has improved the gloss of the printed surface. Although the glazing effect is not as good as UV varnish, it is better than using water-based varnish on ordinary inks. At present, the biggest disadvantage of mixed ink is that it is more expensive than ordinary offset ink. However, printing with mixed inks can dry instantly, saving labor, reducing waste, and speeding up print preparation time, so the overall cost has not increased. At the same time, it can be transported and shipped out immediately after printing, which improves productivity and reduces powder spraying and related maintenance costs. Another area that needs to be improved for mixed inks is that when printing high-gloss products with multi-color mixed inks, the technology has not yet reached the perfect level. The future of mixed ink will be a new development direction of ink technology. The future hybrid ink will mainly develop in several directions: the development of efficient UV curing technology for mixed ink printing; the inexpensive and high-brightness color hybrid ink that does not reduce gloss is also an important development direction.
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