Brief introduction of the application principle and advantages of UV ink
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In recent years, UV inks have become more and more widely used as the fastest growing environmentally friendly inks, and the global UV market is growing at a rate of 10% per year.
In order to survive in the fierce market competition, printing companies must improve product quality, so they must choose the right equipment and consumables. Since UV inks give special value to prints, their use is increasing.
In the field of printing, UV offset printing has become an important method for book covers, advertising posters, and decoration. Because of the good decorative effect of UV ink, it does not contain volatile harmful substances and fast fixation, and is favored by people. The application of UV technology in offset printing has shown great vitality.
First, the application principle of UV ink
The main components of the UV ink include an organic pigment, a photopolymerizable prepolymer, a photosensitive monomer, a photopolymerization initiator, and the like. The effects of each component are shown in Table 1.
UV inks solve the drying problem in printing with their unique drying method. Its drying principle is to achieve photochemical reaction of the ink by ultraviolet radiation to the ink, thereby achieving the purpose of curing the ink. UV inks have the following two main chemical reactions during the drying process.
Photochemical reaction
The photopolymerization initiator contained in the ink undergoes a photochemical reaction under ultraviolet radiation to generate a radical.
Chain reaction
The photochemical reaction generates a radical having a chain reaction ability, and the unsaturated polyfunctional prepolymer, the polyfunctional prepolymer, the polyfunctional crosslinking agent, and the reactive diluent in the ink are chain-reacted and cross-linked to each other. A photocured product having a three-dimensional structure - a dry ink film.
Therefore, the drying of the UV ink mainly depends on the drying characteristics of the photocuring, so that the ink has different drying properties under the conditions of receiving light and being unaffected by light, that is, the ink does not receive light during printing, and maintains stable rheological properties, and has good properties. Printing state; after printing, it is irradiated by ultraviolet light and dried quickly, which can meet the post-press operation, greatly improve the production efficiency, and greatly improve the adaptability of ink drying.
Second, the advantages of UV ink
1. Volatile organics
Most UV products contain little or no organic solvents, and there is no solvent attack to damage the printed matter and pollute the human body and the environment.
2. Suitable for non-paper substrates
It can be printed on common substrates or on non-absorbent materials such as film, synthetic paper, metal or plastic.
3. Suitable for instant post-press processing
It can be cured quickly after exposure to ultraviolet light.
4. Use less ink
Since the UV ink does not contain a solvent, it is only required to use the amount of ink of 1/3 to 1/2 of the amount of the conventional ink to obtain the desired effect.
5. Strong color matching ability
By adjusting the viscosity, hue and lightness of the ink, you can add rich colors. You can get a variety of desired colors by mixing two or more basic colors.
6. Opacity is easy to control
The pigment or pigment can be added to the extended base to achieve the desired brightness according to the standard ratio.
7. UV ink can be processed under special printing conditions such as ice, refraction, frosting and wrinkles.