According to the needs of product glazing, apply the local glaze coating to the prominent parts of trademarks and packaging prints. The glazing patterns are brighter, brighter and more stereoscopic than the surrounding patterns, and can produce unique artistic effects. So it is very popular with Chinese and foreign merchants. Partial UV glazing is a kind of surface finishing technology for printed products. It is named because it uses UV varnish with high brightness, transparency and wear resistance to selectively varnish printed graphics. While highlighting the theme of the layout, it also improves the surface decoration effect of the printed matter. Local UV is mainly used in the finishing of book covers and packaging products to achieve the purpose of adding icing on the cake. UV effect Common local UV effects are currently: local bright light, local extinction, local scrub, local colorful local refraction, local wrinkles and local ice flowers. Partial UV can be implemented after coating, or directly glazed on the printed matter, but in order to highlight the effect of local glazing. Generally, it is carried out after the printed matter is covered with film, and it is mostly covered with matte film, accounting for about 80% of local UV glazing products. The biggest difference between partial glazing and full version glazing is that, first, the printing plate needs to be made and second, there are certain registration requirements for the glazing equipment. There are three main elements of local UV glazing, namely glazing plate, equipment registration and curing equipment. In order to ensure that the local UV glazing parts are consistent with the size of the printed graphics, the photosensitive imaging method should be used when making the glazing plate. classification 1. Partial polishing of screen printing Screen printing has the characteristics of high ink transfer, thick ink layer and strong three-dimensional sense. The screen for glazing should generally use a 200-300 mesh screen (for a local matte, local colorful and other glazing effect, the mesh number is lower), and the tension of the stretched mesh is 20-25N / cm. Because the equipment investment is not large. Many books and periodicals and packaging factories prefer to use screen printing when increasing their local polishing business. Some professional printing and glazing companies improve the glazing precision and production efficiency. Already using fully automatic cylinder screen printing machine. The production speed can reach 3000 sheets / hour. But the partial glazing of screen printing basically adopts offline production mode. There are few applications for online rotary screen printing units. 2. Partial glazing The characteristic of flexographic printing is that it can form a thicker coating with a simpler process. Therefore, it is quite popular in UV coating. Partial coating of flexographic printing is divided into ordinary flexographic printing glazing and special flexographic printing glazing, and some simple graphics and texts still use engraved rubber relief. The flexographic printing partial glazing is suitable for offline glazing and online glazing. Adopt flexographic printing glazing method, with anilox roller and cavity scraper, can accurately control the amount of varnish, and the glazing quality is stable. 3. Partial glazing Gravure printing also has advantages in partial uV glazing due to the thick printing ink layer and high gravure cylinder durability, especially the advent of sheet-fed gravure presses has contributed to the development of gravure partial glazing. However, due to its high plate-making costs, it is mainly used for long-term polishing services. 4. Other local polishing methods No one will use offset printing to glaze until there is no UV varnish because its printing ink layer is too thin. The UV varnish has a thick film layer, high gloss, and the advantage of high overprinting accuracy. There are also some applications in local UV glazing, but it is mainly used for online glazing. From the production method, the local UV glazing machine can also be divided into offline glazing and online glazing. Offline glazing refers to printing, where glazing is performed on dedicated equipment and requires a dedicated glazing machine or calender. When glazing off-line, the prints can be sufficiently dried, so you can get a higher gloss than on-line glazing. In addition, offline glazing production flexibility is great. Equipment investment is small. Online glazing refers to printing and glazing completed on a production line, that is, adding glazing and UV curing devices to the printing machine. After the printing is finished, the coating is directly glazed. Partial UV new technology 1. Mixed ink technology Because UV printing or UV coating is not suitable for the surface of the substrate with strong absorption, and the adhesion of the printing ink surface is not good, most of them require online UV coating. If all of the UV printing is used, the cost will inevitably increase : If printing with ordinary inks, laminating or comprehensive glazing before glazing will undoubtedly hinder the application of offset glazing. The mixed ink technology effectively solves this bottleneck problem. It combines the advantages of UV ink and traditional ink in terms of performance, that is, the advantages of photocuring and oxidative polymerization drying, improves the synergistic effect of the ink surface and UV varnish, and paves the way for online glazing of offset printing. 2. Backward light Pro-Cure is relative to traditional local glazing. The traditional glazing method (flexo printing screen printing or gravure printing) is used for local glazing. Finally, local glazing must be used to achieve high contrast of local graphics and text. Therefore, the overprint accuracy of glazing and printing becomes glazing. The key to the process. The retro-glazing process breaks through the above-mentioned laws, so that the registration problem is solved. 3. Online UV coating Online glazing is no longer a new technology for flexographic printing and gravure printing. For offset printing with a wide range of applications and high printing accuracy and speed, it is launched under the call of differentiated and value-added services. Glazing technology with innovative ideas. There are four main forms of online UV glazing that have been applied: ordinary ink + double glazing (aqueous glazing + UV glazing); mixed ink + UV glazing; UV ink + UV glazing; UV ink + OP oil + UV glazing (reverse glazing). Barber Scissors Set,Pet Scissors Set,Small Pet Scissors,Fishbone Teeth Pet Scissors Zhangjiagang Mister Tools Co., Ltd , https://www.mingshiscissors.com
Partial UV coating process of post-printing process