The green characteristics of the hottest UV ink ma

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The green characteristics of UV ink make the market development space broader.

uv ink is a kind of ink without solvent, with fast drying speed, good gloss, bright color, good water resistance, solvent resistance and wear resistance. At present, UV ink has become a mature ink technology, and its pollutant emission is almost zero. UV (ultraviolet curing) ink refers to the ink that uses ultraviolet light of different wavelengths and energies to polymerize the monomers in the ink binder into polymers under the irradiation of ultraviolet light, so as to form a film and dry the ink. UV inks also belong to inks. As inks, they must have bright colors (except for special cases), good printability, and appropriate curing and drying rate

in addition, UV ink has the following characteristics: ink curing of non absorbent substrate; Ink emulsification may hinder the adhesion of ink and substrate; The speed of rotary printing machine is fast, which requires that the curing speed of ink should match the printing speed, especially for self-adhesive printing and Securities printing with special ink. The printing effect of UV ink is better than that of resin offset printing ink. Considering the above performance, printing enterprises generally use UV ink in offset printing

however, the printing industry should also pay attention to the following points when using UV offset printing

(1) different inks should be selected for substrates with different properties, and the light transmittance, curing rate, covering property of the ink and the gloss of the print surface should be comprehensively considered

(2) in color printing, the ability of various pigments to absorb UV photons is different, and the transmittance from high to low is m, y, C, Bk. therefore, the curing degree of various color inks is also different. The transmittance directly affects the excitation energy of photons to photoinitiators. Therefore, the printing color sequence should be arranged as BK, C, y and m, so that the ink with poor light transmittance can absorb photons as much as possible and enhance its curing effect

(3) the use of alcohol fountain system can reduce the surface tension of the ink and promote the curing effect. In the printing process, the fountain solution can be used to strengthen the oil drainage area (blank part) of the printing plate to ensure that the oil friendly area is fully ink friendly and the water friendly area is not inked

improving the ink formula and adding corresponding additives can increase the hydrophobicity of the ink. While outputting energy, strong electromagnetic radiation interference will be generated on the output line. However, too strong hydrophobicity will lead to ink shrinkage at the image edge, loss of fine layers, unclear point boundaries, etc., which will affect the print quality

(4) UV printing requires high surface strength of paper, and it is easy to cause galling failure if the surface strength is not enough. When printing with gold and silver card paper, because the surface of this kind of paper is smooth and the affinity for ink is small, the ink of the first color is easy to be pulled out during the second color overprint. Therefore, in UV printing, the paper with large surface tension should be selected, the color sequence should be reasonably arranged, and the relevant process parameters in the printing process should be adjusted to avoid and reduce the occurrence of the above phenomena

according to the survey, UV curing technology was applied to industrial production in the early 1960s, but it was not used in limited scope by the printing industry until the 1970s. With the development of modern technology in our country, there are many companies that consume experimental machines. UV ink and its curing and drying technology are becoming more and more perfect. UV technology has been widely used in offset printing in the late 1990s. In recent years, UV offset printing has developed very rapidly, with an annual growth rate of more than 10%. In the field of packaging and printing in Europe and America, UV ink accounts for about 65% of the total sales of offset printing ink

uv inks are usually composed of pigments, prepolymers (oligomers), active diluents, photoinitiators and additives. They do not contain solvents. After curing, the solid content of the ink is close to 100% and almost does not contain VOC (organic volatiles). During the curing process, there will be no harmful environmental pollution. There is no need to invest in environmental treatment facilities and security protection equipment, making the UV ink the most suitable environmental protection material. As UV ink or varnish does not need a smoothing agent to migrate from the film to the surface, it needs to use organic solvents, which can effectively save oil resources, continuously improve the product grade, reduce the damage to the living environment, save the cost caused by air purification, and improve the working environment and health. Therefore, UV offset printing technology has many obvious low-carbon printing characteristics compared with traditional offset printing technology

uv offset printing has the green characteristics of no VOC emission, low energy consumption and low production cost, which will make it occupy a very important position in the low-carbon and green road of offset printing. Because, with the development of social economy and the improvement of people's awareness of environmental protection, low-carbon and green printing is the only way for the printing industry. It can be seen that the offset printing market is vast, and the offset printing market will drive the development of UV ink market

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