Similarities and differences between UV and EB ink curing
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UV and EB electron beam curing of electromagnetic wave rays are different from IR infrared heat curing. Although UV (Ultra Violet) and EB (Electronic Beam) have different electromagnetic wavelengths, they can be used for the mordant in the ink. The chemical recombination, that is, the cross-linking of the polymer forms an instant cure. The IR infrared ray is used to heat the ink to produce a variety of solvents including evaporation or drying of a small amount of solvent or water, softening and softening of the ink, increased fluidity, osmotic absorption and drying, and surface oxidative drying of the surface of the ink layer by heating and air. In addition, some of the resin and polymer oils are superimposed and chemically cured under heating. It is a part of dry and comprehensive curing which is heated to produce multi-component and dispersed, and has no single complete curing effect. For example, a solvent-based ink is 100% different by the disturbance of the wind to cause the solvent to evaporate and solidify.
UV curing is different from EB. UV curing has a very limited penetration rate due to UV rays. For example, the thickness of ink coating of 4~5μ is cured by slow, high-energy UV light, which is not as good as 12,000, 15,000 per hour. Zhang is solidified under high speed operation, otherwise the penetration is insufficient to cause the surface layer to solidify, while the inner layer is still in the liquid state like the unexpanded poached egg. Finally, the surface layer may be remelted to cause sticking failure. Moreover, UV has a great change in the penetrating power of each color ink, and can easily penetrate the magenta Magenta and blue Cyan ink layers, but it is absorbed by the yellow ink layer Yellow and black Black, or is greatly reflected by the white ink surface layer. Therefore, the printing color ink layer is superimposed in order, which causes a considerable change in UV curing. If the black ink or yellow ink which absorbs large UV light is cured on the surface layer, the red and blue inks underneath are likely to be insufficiently cured. On the contrary, the red and blue inks are on the top, and the yellow and black inks are on the lower side. It is more likely to be completely cured. Otherwise, the colors must be separately cured 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 medium, plastic, etc., and can also be used for double-sided two-side penetration curing. In addition, when the white primer is forced to cure by UV light, it is very difficult to reflect the UV light, but the EB radiation does not need to consider its penetration, which is better than UV.
However, an important condition for EB curing is that the action surface must be in an "anaerobic" state in order to have sufficient efficiency. If UV is cured in air, EB must be increased by more than ten times. Its electromagnetic wave radiation is already a very dangerous operation, and it must have very strict safety protection. If it is ten times stronger, it cannot be operated reasonably. Therefore, the solution is to fill the curing chamber with nitrogen to drive off oxygen and reduce oxygen interference. EB-ray cross-linking for high-efficiency curing purposes. In fact, when the coating layer of the semiconductor industry is forced, the imaging exposure of UV light in an oxygen-free nitrogen chamber is often used. Therefore, EB ray is only suitable for the curing coating and printing ink layer of thin paper and plastic rolls, and is not suitable for the ink curing work of the leaflet machine driven by the bite paper chain claws, and the operation of UV ultraviolet rays under oxygen conditions. Sexually large, but few people currently use anaerobic curing to do the printing of ink or glazing.