Since the introduction of matte (metal-like etching) ink, it has been widely used in high-end cigarette and wine packaging printing. Afterwards, wrinkles, ice flowers, refraction, coral and other inks have appeared, which are favored by the majority of high-end packaging users. Matte, wrinkles. The printing effects of ice flower, refracting light and coral have a good decorative effect in packaging prints. They are collectively called decorative textures, the inks used are collectively called decorative inks, and their printing is collectively called decorative printing.
Decorative texture screen printing method
The inks used in decorative printing are all UV inks, first of all due to the fast curing speed of UV inks and good printing quality. Even the commonly used solvent-based inks are slow to cure even with infrared drying. Water-based inks are of course slower to cure, while UV inks can be cured in only 3 to 5 seconds, or even less than 1 second. Second, frosted and refracted. Decorative textures such as coral must be cured instantaneously after printing. Decorative textures such as screen printing wrinkles and ice flowers must be cured by ultraviolet light to cause uneven surface shrinkage, so they can only be printed with UV inks.
The decorative texture of screen printing has the advantages of simple equipment, less investment and quick launch. When making a plate, most of the parts on the screen that need to be printed with decorative texture are blank (except for the refractive effect), when printing. Decorative ink can be missed on the substrate. Create the desired texture through the inherent characteristics of various screen printing inks.
Matte printing is one of the most common applications in decorative printing and is widely used in cigarettes. Printing of packaging for wine, cosmetics and health products. The formulation of the matte screen printing ink contains, in addition to the semi-polymer, reactive diluent and photoinitiator necessary for general UV inks, some granular materials with a size of 5-50 μm and a content of 5% -40%. When printing, use a scraper to press the ink, so that the ink is transferred to the substrate (usually gold or silver cardboard) through the mesh of the screen. When the ink is printed on gold and silver cardboard, the particles are also transferred to the gold and silver cardboard at the same time. Due to the effect of surface tension, the slurry in the ink will agglomerate to the surface of these particles and form There are many large particles with these particles as the core and the outer surface of the cured resin, which is what we call frosted particles. It can be seen that the generation and distribution of frosted particles are random. There are many factors that affect the size, color tone and distribution of the frosted particles. In addition to the ink formula, the mesh size, the shape of the blade, the angle of the blade, the old and new blades, the distance between the screen and the substrate. Squeegee speed, force, and substrate performance all have an impact on the formation of frosted particles. In addition, the scraping of ink is like filtering the ink. The resin and fine particles in the ink are more likely to pass through the screen, while the coarse particles are more accumulated in the residual ink, so the composition of the ink will occur after each scraper scrapes Changes, the printed matte texture will also change. Due to the influence of the above factors, even in the same batch of prints, almost all of them are different. This determines that the matte effect of screen printing is only decorative function, no anti-counterfeiting function.
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