UV coating method
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There are many UV glazing methods, and there are many classification methods. There are mainly the following classification methods:
1. According to the relationship between the machine and printing press classification can be divided into: offline coating and online coating two ways. (1) Off-line glazing: Off-line glazing uses a special glazing machine to polish the printed matter, that is, printing and glazing are performed on the respective dedicated devices. This kind of glazing method is more flexible and convenient, and the glazing equipment investment is small, which is more suitable for professional post-press processing manufacturers. However, this glazing method increases the transportation and transfer between the printing and glazing processes, and the production efficiency is low.
(2) On-line coating: On-line coating directly connects the coating unit to the printing unit, that is, printing and glazing are performed on the same machine, which has high speed, high production efficiency, low processing cost, and reduces the handling of printed materials. Overcoming all kinds of quality problems caused by dusting is the future direction of development. However, the on-line coating has high requirements for coating technology, coating oil, drying equipment, and coating equipment.
2. According to the glazing method, the classification can be divided into two types: roller coating and printing glazing.
(1) Roller coating
Roller coating is the most common method of glazing. The coating roll is used to spread the coating on the surface of the printed product.
(2) Printing glazing
Printing glazing coats lacquer on the prints through a glazing plate so that it can be applied locally. Currently used are gravure coating, flexo coating, offset printing, and screen polishing.
3. According to the classification of glazing product types, it can be divided into: full-width surface, partial glazing, extinction glazing, and artistic glazing.
(1) Full-width light
The main role of full-frame light is to protect prints and improve the surface gloss of prints. Full-frame light is generally applied by roller coating.
(2) Partially glazing
Partial glossing is generally used to polish parts of graphics that need to be emphasized in printed matter. The use of a high-gloss picture of the glossed part is compared with a low-gloss picture that has no glossiness, resulting in wonderful artistic effects. The partial coating is performed by the method of printing glazing, in which the film obtained by screen printing is thicker, the effect is more obvious than other methods, and the cost is low. Currently, it is used more domestically, but its production efficiency is general. Lower.
(3) Extinction coating
Extinction coating uses UV matte oil, which has the opposite effect of ordinary coating. It reduces the glossiness of the print surface and produces a special effect. Because the gloss is too high to stimulate the human eye to a certain extent, extinction coating is currently a popular glazing method.
(4) Art glazing
The role of artistic glazing is to obtain special artistic effects on the surface of glazing products. If using UV pearlescent coating on the surface of the print, it will produce a pearl effect on the printed surface, making the printed material look grand, elegant and elegant.