Characteristics and applications of the hottest UV

2022-08-14
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Characteristics and uses of UV metal inks (II)

printing and curing of UV metal inks

printing color sequence

every u v metal ink has an optimal printing color sequence. UV inks of different colors have different light curing speeds. Some cure slowly and some cure quickly. It is not possible to print any color first like self drying solvent ink. When printing UV metallic ink, especially multi-color printing, it generally follows that dark ink is printed first and light ink is printed later

there is an optimal curing sequence for u v metal inks with different colors. The curing sequence of U V metal ink is gold, silver, black, blue, red, yellow, colorless and transparent varnish. Dark ink requires large UV light energy, drying is slow, and UV light is not easy to penetrate the ink layer, and the bottom layer is not easy to cure, so you must first print dark ink; Light colored inks are easy to cure and only need to be illuminated once. If the light color ink is printed first, it will inevitably cause the light color to cure too much, the ink layer is brittle, and the adhesion is poor, while the dark color ink layer is not cured enough, the surface hardness is low, and the wear resistance and solubility are poor. UV ink can be cured immediately after printing. When the introduction of the second color ink is clear, the first color ink has been illuminated twice. If it is a four-color pattern, when the fourth color ink is cured, the underlying ink has been cured four times

selection of mesh number of silk

different types of UV metal inks need to choose different mesh numbers of silk for printing. UV ink curing is instantaneous. The faster the curing speed is, the easier the cured film shrinks; The lower the number of wire mesh, the larger the wire diameter, the thicker the ink layer, and the more obvious the shrinkage of the cured film. When the ink layer and the metal substrate cannot shrink synchronously, the adhesion will inevitably be reduced

general color inks such as uv-mi-20, uv-mi-25 and uv-mi-105 series can use 300 ~ 350 mesh silk, while uv-3000 color sand series inks can only use 180 ~ 220 mesh silk, which is determined by the size of metal particles contained in the ink. The mesh is too high, and the sand particles cannot leak out

when printing UV anti-corrosion ink, the eye should be determined according to the accuracy and depth of metal etching. Fine patterns can be printed with 300 eyes. When the etching is deep, sometimes 120 mesh wire is used

when printing UV special effect ink, there are curing conditions. For general metallic inks such as uv-mi-20 series, when printing 300 mesh silk, two high-pressure mercury light fixers with a speed of 5 ~ 15 m/min can be used for curing. The pencil hardness of the curing film is greater than 4h, and the adhesion is 100%

uv-mi-25 series of advanced light curing metal inks contain a small amount of small molecule additives, which can enhance the ink's adhesion. Therefore, it is expected that the domestic mineral price will continue to stabilize the wetting of mirror metal in a short time and improve the penetration of ink into the metal surface coating. Therefore, before light curing, heating the surface of metal products with infrared lamp or hot air can effectively improve the adhesion fastness of ink. For porous surface, such as anodized aluminum plate, sandblasting or metal products with sanding effect, it can significantly improve the ink adhesion and surface hardness. The photo curing machine in Figure 5 is equipped with infrared heating device and wrinkle device, which is specially designed for the curing of these difficult to adhere metals

uv-mi-105 series elastic metal inks in order to make the cured film have good elasticity and resist the tension during stamping, the crosslinking density of the cured film will not be very high, so the speed of UV curing should be slower

u V special effect inks, the curing speed of u v-880 ice flower ink is the slowest. The curing of this ink is divided into two processes: the generation and curing of ice flower patterns. The pattern of ice flower does not need too strong UV irradiation, but this process usually takes dozens of seconds. After the formation of ice flower, it can be cured by strong light. Many photo fixing equipment manufacturing companies do not understand this principle. The ice flower photo fixing machine produced has a large power, and most of the light energy has become heat energy, which not only consumes electricity, but also makes it difficult to remove heat, and the effect is not good. In Figure 6, the lamp spacing of U V ice flower light fixture can be adjusted high and low

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