Basic skills and application of the most popular s

Basic skills and application of color matching of silk screen printing ink

adjustment of printing suitability of ink. Generally, the viscosity of the silk screen printing ink delivered from the factory is slightly higher. Users should comprehensively adjust the viscosity, surface tension, fluidity and drying speed of the ink with appropriate solvents, diluents, surfactants and viscosity reducers according to the characteristics of the printed image, the number of silk meshes, printing speed, workshop temperature, the surface tension and ink absorption performance of the substrate

three points should be paid attention to when tinting silk screen printing inks:

these values can include: uncertainty of measurement results, detection limit, selectivity of methods, linearity, repeatability limit, reproducibility limit, robustness against external influences and interaction sensitivity against matrix interference from samples. A. when mixing inks, try to add as few inks of different colors as possible. The less the types of inks, the better the mixing effect

b. adopt the principle of "from light to deep". No matter preparing light color or bright color ink, be careful when the hue is close to the template. It is better not to mix and transfer the inks produced by different manufacturers, and try to use the inks of different colors from the same manufacturer for color matching, otherwise there will be uneven hue, and in serious cases, there will be condensation and the ink will be scrapped

c. China announced a major change in the quality control of imported materials. Some silk screen printing inks are dried by drying. Light colors are shallower than those not dried, and dark colors are darker after drying. In addition, it is easy to ignore whether the hue of ink is different before and after drying during printing. Generally speaking, through natural drying (solvent volatile ink), the substrate is plastic, metal, paper, glass, etc., and the color will not change; However, if the pigments used in ceramics are colored after burning and oxidation, they can only be colored by experience. For silk screen printing inks that are dried by thermosetting and photosetting, the color changes in depth, as mentioned above. When the amount of ink is large, you can use the ink mixer, which can complete the color matching in a short time

crude oil inks are mixed in different proportions to produce many colors of inks

the allocation of light color ink is generally based on white ink, with appropriate color ink. Such as light blue, mainly white ink, slightly blue (cyan); Light red, mainly white ink, slightly bright red; Gray, mainly white ink, slightly black; Silver gray, mainly white ink, slightly added with silver powder, plus a small amount of black ink. When preparing light color silk screen printing inks (printing materials), try to add less white ink, because white ink has great activity and is easy to make other colors change color

in order to adjust the ink well, screen printing workers must do:

a. understand various specifications and performance of ink; Make the matched ink suitable for production needs

b. master the basic knowledge of chromatics and use it freely in inking

c. analyze the printing color and process technology, and find out the color sequence of multiple colors, so as to avoid the wrong color sequence, the two colors are miscible, and the color changes

d. pay attention to the brightness of the ink color when adjusting the ink. It is required that the ink with high brightness should be mixed with the primary color as far as possible, otherwise it is easy to make the ink gray and reduce the original color brightness

adjustment of ink printability

generally, the viscosity of the silk screen printing ink delivered from the factory is slightly higher. Users should comprehensively adjust the viscosity, surface tension, fluidity and drying speed of the ink with appropriate solvents, diluents, surfactants and viscosifiers according to the characteristics of the printed image, the number of silk meshes, printing speed, workshop temperature, the surface tension and ink absorption performance of the substrate. Such as silk screen fine line and dot 5. The lead screw and transmission part of the electro-hydraulic servo universal experimental machine should be coated with lubricating oil regularly, so that the ink fluidity should be slightly small, and the drying speed can be slightly slow; During rough printing, the viscosity should be slightly higher, and the drying speed can be slightly faster; In high-speed printing, the fluidity is slightly larger, and the drying speed can be slightly faster; When the workshop temperature is high, the drying should be slightly slow and the viscosity should be slightly high; When the surface tension of the substrate is small, the surface tension of the ink should also be smaller; When the ink absorption of the printing surface is strong, the fluidity and surface tension of the ink can be larger, and the drying speed can be slower. Adaptive adjustment technology also depends on practical experience