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Color printing ink allocation from printing experience I. color printing ink allocation the hue, lightness and printability of color printing ink are directly related to the quality of color printing products, so we must correctly grasp the allocation method of ink

today, from the perspective of plate printing process, Anmei mall talks about the superficial understanding of color printing ink allocation

it is important to master the principle of using the same type of ink and auxiliary materials. If the ink is type 05, the auxiliary materials should also match it to improve the printability of the ink. In addition, the number of primary color inks should be minimized. In other words, if two primary color inks can be used, the third one should not be used, so as not to reduce the brightness of the ink and affect the brightness of the color. There are two kinds of color ink blending. One is dark ink blending, that is, the ink that does not match the primary color or intermediate color between the measured hardness value and the indicated value of the standard hardness block, and the ink that is blended without any diluent; The other is light ink, that is, the ink prepared by adding diluent into the original ink

(-) mixing method and color principle of dark ink

first, the ink color to be used should be preliminarily judged according to the hue of the original, and then an appropriate amount of each color of ink should be taken and put on the ink mixing table for a small amount of mixing. When mixing, you should master a principle, that is, gradually add dark ink to light ink. Do not take the dark ink first and then add the light ink, because the tinting power of the light ink is poor. If you use the method of adding the light ink to the dark ink to mix, it is not easy to adjust the hue, often making the ink volume more and more, which is not desirable. When the ink color phase is adjusted to be similar to that of the original, the ink color sample can be scraped with the printing paper, and then compared with the original. If the color deviation is still found, add color to correct it until it meets the printing sample. After the ink hue is difficult to adjust, their respective portions can be calculated, so as to carry out batch allocation in proportion. If three primary color inks are used to mix dark inks, their change rules should be mastered to improve the ink mixing effect. For example, the three primary color inks are mixed in the same amount, and the resulting color is similar to black; The two primary colors in the three primary color ink are compressed by equal or unequal temperature adjustment to obtain various intermediate colors, and their hues tend to the color with large content ratio; Three primary color inks are mixed in various proportions to obtain a variety of multicolor; When black ink is added to any color ink, its brightness will inevitably decrease, resulting in dark color transition. If white ink is added, its brightness will be improved. Intermediate and multicolor inks can be prepared with three primary inks. However, in consideration of convenient allocation and minimizing the number of inks, intermediate primary inks can be used

when mixing multicolor inks, we should grasp the color principle, and we must not use this kind of color to add dots, and that kind of color to add dots to try. For example, the blue phase in the light lake green ink should be sky blue or peacock blue, and should not be adjusted with dark blue, because the dark blue ink has a red taste, which will inevitably make the color dark but not bright. In the same way, you can't add dark yellow ink that tends to be red. You should use light yellow ink that tends to be green. For another example, when matching orange ink, you can't choose rose ink because it has a blue flavor. The green composed of blue and yellow is the complementary color of red, which will make the ink lack of a bright sense

the color of some inks has its unique hue. Just as the hue of golden red is red with yellow light, it will increase the brightness of black when used to mix orange. For printing orange color, if orange ink printing cannot achieve bright effect, and the printing is not realistic, the printing color will be much better if golden red and lemon yellow are mixed. For another example, to print the green scenery picture in early spring, light yellow ink should be used to mix, which can print the tender green and lovely leaves. If the dark yellow ink is used, because the dark yellow ink contains a red taste, and red is the complementary color of green, the printed leaves must be scorched, turbid, and can not reflect the breath of early spring

when blending multi-color ink, if the complementary color law is used to correct the color deviation, the color matching effect will be better. For example, if the purple flavor in a multicolor ink is too heavy, yellow ink can be added to correct it; If the red flavor is too strong, it can be corrected by adding green ink (such as malachite blue or sky blue ink), which can play a role in reducing the amount, further improving the graphene technology innovation system and adjusting the hue of industrial clusters. In addition, if the black ink is yellow and the blackness is not enough, a small amount of light emitting blue can be added as the color enhancer, because light emitting blue is a blue ink with red light, which is also the result of complementary color

(II) blending of light ink

light ink is the ink blended with diluent in the original ink, or the ink blended with white ink and other color inks. The blending method is based on the principle of diluent or white ink, supplemented by other color inks. First weigh the diluent or white ink at an appropriate ratio, and then add the color ink in several times. In this way, while stirring the ink evenly, observe the color change. When the dilution degree is appropriate, use the printing paper to scrape the ink color sample and compare it with the original, and adjust it until it is appropriate

diluted color ink can be divided into primary color, intermediate color and multicolor according to hue. For those diluted with three primary color inks, just add the primary color inks in several times. However, if it is interchromatic, multicolor, and lacks ink blending experience, it is best to mix the relevant original ink into the dark ink of the printed color phase, and then add diluent. It is an important technical link to deploy light ink and master the dilution degree of ink. If the dilution ratio is not enough, it will cause insufficient ink on the surface of the ink roller, the ink color of the print layout is easy to be scratched, the ink layer is dry and not solid, and the color is not bright; If the ink is diluted too much, only by increasing the thickness of the ink layer can the required hue be achieved. In this way, the ink adjustment is easy to cause the low-key area of the layout to appear paste, and the depth and depth can not be distinguished. At the same time, it is easy to cause over bottom imprinting

appropriate inks and diluents shall be selected according to product quality requirements and paper characteristics. If the offset paper is used for printing general products with type 10 ink, 915 diluent (Weili oil) or 554 transparent oil can be selected. If fine products are printed with 05 type ink on coated paper, 0590 gloss paste or 8011 and 8015 diluents shall be selected. The deployment of light color ink should also be noted that the original ink that is not resistant to light, oxidation and easy to change color should not be used to deploy light color ink to avoid color instability. In addition, due to the large white ink ratio, in addition to covering requirements and color matching requirements, a small amount of white ink shall be added for calling, and white ink shall not be diluted as far as possible. In order to prevent quality problems such as poor color overlap and color fading. When mixing inks, attention should also be paid to the specific gravity of different inks. For example, green ink mixed with lead chrome yellow ink and Malachite blue with a large proportion will float after a long time, otherwise it will sink, resulting in floating color. If yellow ink made of organic yellow pigment is used to mix, the above phenomenon will not occur

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