It is also the curing of UV ultraviolet rays and EB electron rays of electromagnetic waves, which is different from the IR infrared heating curing method. Although the electromagnetic wavelengths of UV (Ultra Violet) and EB (Electronic Beam) are different, they can be used for the mordant in the ink. The chemical recombination, that is, the cross-linking of the polymer forms an instant curing. IR infrared heats the ink, resulting in diversity including evaporation and drying of a small number of solvents or water, ink heating and softening, penetration and absorption drying with increased fluidity, and surface oxidation and drying of the ink layer surface due to heating and air. Adding part of the resin and polymer oil and fat to superimpose chemical curing under heating is a multi-component and dispersed partial drying and comprehensive curing effect caused by heating, and there is no single and complete curing effect. For example, the solvent-based printing ink is different in that the solvent is evaporated and solidified by the disturbance of the wind.
UV curing is different from EB. UV curing has a very limited penetration rate of UV rays. For example, the thickness of the ink coating of 4 ~ 5μ should be cured with slow speed and high energy UV light. It cannot be 12,000, 15,000 per hour like flat printing. Zhang is cured under high-speed operation, otherwise the penetration will be insufficient to cause the surface layer to solidify, but the inner layer is still in a liquid state like an unfried poached egg, and may eventually melt the surface layer to cause sticking failure. Moreover, the penetration of UV on various colors of ink changes greatly, and it can easily penetrate the magenta magenta and blue Cyan ink layers, but it will be absorbed by the yellow ink layer and yellow black, or reflected by the white ink surface layer. Therefore, the printing order of the colored ink layers will cause a considerable change in UV curing. If black ink or yellow ink that absorbs UV light is cured on the surface layer, the red and blue inks underneath will easily cause insufficient curing. On the contrary, the red and blue inks are on the top, and the yellow and black inks are on the bottom, it is more likely to be completely cured, otherwise each color must be cured separately when printing in each color sequence. The EB electron beam curing not only has no difference in color curing, but also has strong penetrating power, including paper media, plastics, etc., can also penetrate, and can also be used for two-sided printing and two-sided penetrating curing.
In addition, when the white primer ink is cured by UV light, it is very difficult to reflect UV light, but EB rays do not need to consider its penetration at all. This is where EB curing is superior to UV. However, there is an important condition for EB curing, that is, the action surface must be in an "oxygen-free" state in order to have sufficient efficiency. If irradiating and curing like UV in the air, EB must increase the power by more than ten times, and The electromagnetic wave radiation is a very dangerous operation, and it must have very strict safety protection. If it is increased by ten times, it cannot be operated reasonably, so the solution can only be filled with nitrogen in the curing chamber to expel oxygen and reduce oxygen interference. EB ray cross-linking, to achieve the purpose of high-efficiency curing. In fact, when the coating layer of the semiconductor industry is forcibly applied, the imaging exposure of UV light is often used in an oxygen-free nitrogen chamber. Therefore, EB ray is only suitable for the curing coating and printing ink layer of thin paper and plastic rolls. It is not suitable for the printing ink curing work of the leaf-leaf machine driven by the paper bite chain claw. The operation of UV and UV under oxygen conditions It is relatively large, but at present, few people use oxygen-free curing to do ink or glaze coating.
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