Editor's Note: In the printing process, no matter what kind of printing, whether it is multi-color or monochrome printing, the primary problem encountered before printing is the deployment of ink color, so the ink color selection and deployment are often required. The deployment of ink color is the most important part of printing. The true reproduction of colors directly affects the product quality and market share. In some large-scale enterprises, there are not only specialized dispensers, but also the best. Make customers happy.
Based on the above, we can still summarize the important position of ink in printing. Based on the previous issue (ink viscosity), this issue will talk about the deployment of ink in printing.
Understand ink deployment Ink is a homogeneous mixture of colored bodies (pigments), binders, additives, etc., capable of printing and drying on the substrate, with a certain flow of slurry adhesive. Pigments are used to form colors; linking materials are used to provide viscosity; additional materials can increase the fluidity of the ink, make the ink thinner and reduce the viscosity of the ink, and accelerate the drying reaction of the oxidant, providing wear resistance, gloss, and the like.
Any color is represented by the three characteristics of hue, lightness, and saturation, and thus the above three factors must be considered in the color matching process. When selecting the ink, the gloss, hue, tinting strength and hiding power of the ink itself must be considered. In the ink color matching process, the ink used must be determined according to the actual printing process, the ink layer thickness, and the printing substrate.
Ink formulation refers to the process of blending one or more inks together and adding certain auxiliary materials to suit the printing needs. The preparation of ink mainly includes two aspects: on the one hand, it refers to the adjustment of the printability of the ink, including the viscosity, adhesion, fluidity, and drying of the ink; on the other hand, it refers to the color deployment of the ink:
There are two main aspects of blending inks:
The first is to adjust the printability of the ink. The solvent is mainly used to prepare the ink, diluent and other solvents, so that the ink viscosity, flowability and drying speed performance to meet the printing requirements;
The second is that the color matching of the ink ink is mainly based on the principles of subtractive colorants for ink preparation. Ink deployment is usually a small test sample, and then enlarge the deployment.
Ink deployment knowledge and principle Each color is represented by the three characteristics of hue, lightness, and saturation, and thus the above three factors must be considered in the color matching process. Although black is theoretically the complete absorption of light, black ink still has a gloss. The ink is a mixture of pigment (toner) and resin binder. The pigment particles are surrounded by a layer of nearly transparent resin oil, which has a refractive and reflective effect on the light, so we can feel that the black ink still has a certain gloss on the substrate. The pigment usually accounts for 8-35% of the ink composition. Its amount determines the concentration of the ink, and has a great influence on the ink, such as the relative density, transparency, heat resistance, light resistance and chemical resistance of the ink. Wait. In the process of ink color matching, the ink used should be determined according to the actual printing process, the ink layer thickness, the printing substrate, and other conditions. When selecting the ink, the ink itself should be considered for its luster, hue, coloring power, and hiding power.
1 Printability of ink
The so-called ink printability means that the ink is transferred to the surface of the printing object under a certain printing pressure at a certain printing speed with a certain printing speed. After the printing film is dried, it is fixed on the surface of the printing object to express the desired printing effect. performance.
The printability of the ink includes both the suitability of the print job and the suitability of the print quality. The suitability of the print job of the ink involves the ink being adapted to the corresponding type, machine speed, press pressure and printing object to ensure that the ink can be taken from the packaging container. - ink fountain - ink roller - printing plate - the smooth transfer of printing objects; ink printing quality adaptability refers to the fixation of the ink film transferred to the surface of the printing object, drying speed, color and gloss after filming, Fastness, resistance, and other properties that ensure print quality. The ink color is often referred to as ink. The ink printing suitability is mainly to solve the optimal matching between ink and ink and printing effect.
2 Precautions for color matching
1) Carefully observe the color samples, paying particular attention to the printed substrate, and select the ink from the rough and smooth reflectance of the substrate. For example, inks are printed on aluminum plates or cans that are very glossy and reflective, and the choice of highly transparent inks will help to greatly enhance the metallic luster of inks.
2) When selecting the ink needed for color matching, avoid mixing too much ink as much as possible. Use ink that is close to the standard color and made of a single pigment as much as possible. The color ink used for color matching is too much, the farther from the standard color, the lighter the brightness is. The higher the degree of matteness of the mixed colors, the impossible to use the color to modulate the primary colors. Therefore, it can be said that when two colors are used in color matching, three kinds are not used, and as few as possible.
3) Pay special attention to the tinting strength of the ink. If the selected ink concentration is not high enough, the standard color concentration cannot be achieved regardless of how the ink is dispensed.
4) When you need to add white or black ink, you should pay special attention to the accuracy of the added weight and weight. In all inks, the hiding power of white ink is very strong. If you add too much, it will not only dilute the color, but also stop the bottom. Material reflective degree. However, for the printing uneven substrate such as nylon cloth, cardboard, in order to ensure the appearance of printed products is best to print a white as the background color. Because the coloring power of the black ink is extremely strong and slightly careless, adding too much of it requires the addition of a considerable amount of other color inks to adjust the color, resulting in waste, and therefore requires special attention.
5) When making light color inks, determine how much white ink or varnish (dilution agent) should be added in order to adjust the degree of light transmittance of the ink film. It is absolutely not allowed to use solvents (dilution water) to dilute the color. Too much solvent will not only affect the printing performance, but also will destroy the ink structure, cause the separation of the pigment from the resin oil, precipitate, or greatly reduce the gloss and brightness of the ink. .
Normal > Basic knowledge of packaging printing color deployment
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Normal > On ink color selection and deployment specification Â
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