Deployment of the hottest screen printing ink 0

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Allocation of silk printing inks

in order to successfully carry out silk printing, we must make preparations for printing materials (inks), substrates, plates, etc. For example, whether the type of ink selected is appropriate, and whether the ink color, viscosity and diluent are appropriate; The size, type and quantity of the substrate, and whether the surface needs to be treated; Whether the components of the printing machine operate normally and the surface of the printing table is flat; Whether the size of the printing plate is accurate, whether the accuracy is qualified, etc

I. allocation of ink

before printing, the ink should have good application and printability, and appropriate allocation should be made if necessary

1. color matching. Before ink distribution, calculate the ink consumption of each color print number to make the allocated ink amount appropriate. Especially for two liquid reactive inks, the inking amount should be calculated according to its curing speed and printing speed

to obtain the correct color, inking should be carried out under stable natural light. At the same time, it is not allowed to count the colors and observe them side by side, so as to avoid the influence of illusion. When configuring fresh ink, the addition of dark ink should be gradually close. Do not add too much at one time, and then use a large amount of light ink to remedy. At the same time, try to reduce the hue of the mixture. The more hues, the greater the gray

in addition, pay attention to the color changes before and after drying. For example, on light color substrates with large ink absorption, the ink color after drying is often light; The color difference of wet, dry and bubble state of foaming ink is large; The color of ceramic ink changes after firing; White ink will turn yellow after high temperature. Such discoloration laws require printers to accumulate experience and samples and make their own color codes in practice

the color allocation of screen printing ink (printing material) is a link that cannot be ignored in the process of screen printing production. The basic principle of blending is inseparable from the basic principles of color light addition and color material subtraction

a certain hue of the three primary colors of light can be produced by mixing any two colors in equal quantities. These three hues are called intermediate colors (or secondary colors) from the perspective of color. For example, green formed by the mixing of yellow and green is intermediate color. The hue produced by the mixing of intermediate color and intermediate color is called polychrome (or the third fuse pin return secondary color). The intermediate color and multicolor formed by the mixing of three primary color inks are shown in Figure 3-60

2. ink color matching method. The so-called color matching is to connect more than two colors, or use a small amount of colors in addition to the main color to form a combination of colors. When mixing color inks before use, first expose the color to be prepared on the color sample separately, and correctly distinguish whether the original (or original) color is primary color, intermediate color, or multicolor. If it is intermediate color or multicolor, it is necessary to distinguish the proportion of primary color and secondary color. Secondly, we must adjust the small sample according to the tone indicated by the original. When the color difference is small or equal to that of the original, we can mix it in large quantities, and the time should be short and the adjustment amount should be appropriate. Too little adjustment, resulting in downtime, ink color differences, affecting the normal production; Too much will cause unnecessary waste. Inking is usually carried out in places where the light is stable or not directly illuminated

three points should be paid attention to in the color matching of silk screen printing inks: 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. The principle of "from light to deep" is adopted. No matter how light colored or bright colored inks are prepared, 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 the tone will be uneven, and the forum will continue to run well. In serious cases, there will be condensation and the ink will be scrapped. c. 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 can be mixed in different proportions to produce many colors of inks, as illustrated in table 3-15

table 3-15 example of ink color formula

primary color synthesis proportion color development he once again came to the 2017 annual coal trading conference held in Qinhuangdao magenta yellow green 00500 ∶ 1 ∶ 1 green 50050 1 ∶ 0 ∶ 1 blue purple 50550 1 ∶ 1 black 257501 ∶ 3 ∶ 0 dark yellow 025750 ∶ 1 ∶ 3 Dark green 75003 ∶ 1 ∶ 0 orange red 0800200 ∶ 4 ∶ 1 apple green 10025254 ∶ 1 ∶ 1 red brown 25100 1 ∶ 1 ∶ 4 dark green

light color ink The deployment of white ink is generally dominated by 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 ink well, silk screen printing workers must: A. understand various specifications and properties 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. When mixing ink, we should also pay attention to the brightness of the ink color. Those with high brightness are required to mix with the primary color as much as possible, otherwise it is easy to make the ink "gray" and reduce the original color brightness. 3. 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 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. For example, when screen printing fine lines and dots, 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

reprinted from: silk printing can be used for fatigue test (American Standard)

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