UV printing is a printing process of drying and curing inks by ultraviolet light. It is necessary to match inks containing photosensitizers with UV curing lamps. UV inks have covered the fields of offset printing, silk screen, inkjet, pad printing, etc.
UV curing ink
Ultraviolet curing ink is an ink that can undergo a cross-linking reaction under the irradiation of ultraviolet (UltraViolet) light waves and can instantly change from liquid to solid, so it is also called "UV" ink. Its main components include photopolymerizable prepolymers, optically sensitive monomers, organic pigments, photopolymerization initiators, and additives. Among them, photopolymerization initiator is the most important component in UV ink, and it is the beginning of photopolymerization. Commonly used photopolymerization initiators include aromatic ketones and the like. UV UV curing ink curing / drying principle The main reason for UV ink curing is due to the action of UV rays. Under UV irradiation, the photopolymerization initiator in UV ink absorbs photons of a certain wavelength and turns into free molecules, which become free radicals. Then, through the transfer of energy between molecules, the polymerizable prepolymer and the optically active monomer are changed into an excited state, and a charge transfer complex is generated, and the complex is continuously cross-linked and polymerized, and cured to form a film.
The curing process of UV ink is a process of photochemical reaction, that is, under the action of ultraviolet energy, the prepolymer is cured into a film in a very short time. In addition to causing the surface of the ink to cure, ultraviolet light can penetrate into the liquid ultraviolet curing In the ink, and stimulate the further curing of the deep ink film. In traditional inks, oil-based inks are solidified by oxidation, while solvent or water-based inks are mainly solidified by the evaporation of water or solvents, and some inks can penetrate into the paper. Therefore, compared with traditional inks, the polymerization and drying of UV-curable inks is more thorough, without any evaporation or solvent-based contaminants, and the ink film is 100% cured.
Main characteristics of UV curing oil volume
1. Excellent drying performance. Because the UV ink will only dry under the irradiation of ultraviolet light, even if the ink is stored in the ink fountain for a long time, its performance can be kept stable, and there will be no skinning phenomenon on the ink roller. Moreover, once irradiated with ultraviolet light, the ink can be dried instantly and completely. Its curing time is very short, generally only 1 / 10S can be completely dried and fixed on the surface of the substrate. For traditional thermosetting inks and sheet paper For offset printing inks, the drying time may take a few minutes, or even a few days to completely dry, so the use of UV curing ink to print live parts, short delivery time, can be comparable to flexo and gravure printing, and greatly improve the production efficiency of printing .
2. Facilitates the post-processing process. After UV ink printing, UV glazing and continuous machining are carried out to obtain a printed product with high gloss and smooth and uniform surface. After the machine is glazed, the packaging processing technologies such as die cutting, creasing, gluing and bronzing can be completed immediately, which is very conducive to the needs of high-speed printing development.
3. Good durability. In addition to providing bright and bright colors, UV curing inks also have strong abrasion resistance. The chemical substances in the UV ink form a polymer three-dimensional network polymer through the cross-linking reaction, so the use of UV ink can make the printed ink layer strong, quick-drying and cross-linking. Such an ink layer has high abrasion resistance And chemical resistance. Many prints printed on coated paper by uv ink for direct mail can withstand multiple foldings and can withstand strong radiation during laser printing again, so UV ink can be used for outer packaging printing that requires wear resistance.
4. Good environmental performance. Another important feature of UV-curable inks is its environmental performance. Because the solid content of UV inks is close to 100% after curing, it is almost free of VOC (organic volatiles), that is, no or little volatile is emitted during the curing process. Organic compounds, will not cause more harmful environmental pollution, and waste less, and save energy, do not have to worry about handling harmful flammable and explosive materials, it is an environmentally friendly ink.
5. Printing adaptability is strong, can meet the needs of a variety of substrates. Of course, UV-curable inks also have some shortcomings: some require NBR rubber rollers or EPDM rubber rollers, and sometimes special blankets may be needed, and the blankets may also need special cleaning agents to prevent the blankets from shrinking, expanding, or reducing quality . Secondly, its cost is higher than traditional ink. However, the high cost is worthwhile compared to the performance of the printed product finally obtained.
UV printing and varnishing can perform various value-added printing technologies on various materials including metal foils and plastics. Increasing demand for UV The continuous development of the UV market has continued for many years. The annual growth rate in the world is nearly three times higher than the average growth rate of the printed products industry. The growth in single-sheet printing and many flexographic applications is even more Is strong.
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