It is very important to blend inks to master the principle of using the same type of ink and the same type of auxiliary materials as much as possible. If the ink is "05 type", auxiliary materials should also be matched to improve the printing suitability of the ink. In addition, the number of primary color inks should be used as little as possible, that is to say, if the two primary color inks can be used, the third type should not be used, so as not to reduce the brightness of the ink and affect the vividness of the color. There are two types of color ink preparation, one is dark ink preparation, that is, the original ink with three primary colors or intermediate colors, and the ink color prepared without adding any diluent; the other is light color ink, that is, adding dilute to the original ink The ink prepared by the agent.
2. The preparation method and color principle of dark ink should first determine the ink color to be used according to the original hue, and then take the appropriate amount of each color ink and place it on the ink table for a small amount of adjustment. When blending, you should master the principle that dark ink is gradually added to light ink. Do not take the dark ink first and then add the light color ink, because the color strength of the light color ink is poor, if you use the method of adding the light color ink to the dark ink to adjust, it is not easy to adjust the hue, often the amount of ink is adjusted more Is undesirable. When the hue of the ink is adjusted to be similar to that of the original, you can use the printing paper to scrape the color sample, and then compare it with the original. If there is a color deviation, add color to correct it until it matches the printed sample. After the hue of the ink is difficult to adjust, their respective weights can be calculated so that the batch can be adjusted in proportion. If three primary colors are used to mix dark inks, they should be mastered in order to improve the effect of ink adjustment. For example: the equal mixing of the three primary colors ink, the resulting color is close to black; the two primary colors in the three primary colors are equal or unequal temperature adjustment, can obtain a variety of inter-color, the hue is biased to the color fruit with large content ratio; The three primary color inks are mixed in various proportions to obtain a variety of multiple colors; if any color ink is added with black ink, its brightness will inevitably decrease so that the hue becomes darker. If white ink is added, its brightness will increase. Inter-color and multi-color can be formulated with three primary colors of ink, but from the perspective of convenient deployment and minimizing the number of inks used, inter-color primary inks can be used. When blending multi-color inks, the principle of color should be well grasped, and â€œthis color should be added, and that color should be addedâ€ for trial adjustment. For example, the blue in the green ink of the light lake should be sky blue or peacock blue, and never use dark blue to adjust, because the dark blue ink has a red flavor, and after adding it will inevitably make the color dark and not bright. For the same reason, reddish dark yellow ink cannot be added, and lighter yellow ink should be used. As another example, when mixing orange-red ink, you cannot use rose-red ink, because it has a blue flavor, and the green composed of blue and yellow is the complementary color of red, which will make the ink color lack of vividness. The color of some inks has its unique hue, just as the hue of gold and red is that red glows yellow, and it is used to adjust orange to make black more vivid. Printing orange color, if printing with orange ink can not achieve the bright effect, and the printing is not realistic, with gold red and lemon yellow mixed, the printing color is much better. In another example, when printing the green landscape of early spring, it is advisable to use yellowish ink to prepare it, which can print the tender green and lovely leaves. If dark yellow ink is used, because the dark yellow ink contains red flavor and red is the complementary color of green, the printed leaves must be black, turbid, and cannot reflect the breath of early spring. When blending multi-color inks, if you use the complementary color law to correct the color cast, the toning effect will be better. For example, when the purple smell is heavy in a certain color ink, yellow ink can be used to correct it; if the red smell is heavy, green ink (such as peacock blue or sky blue ink) can be added to correct it, which can play a small amount and adjust the hue. . Another example is that the black ink is yellowish and the blackness is not enough. A small amount of blue light can be added as a coloring material, because the blue light is a blue ink with red light, which is also the result of the complementary color.
2. The preparation of light-colored ink Light-colored ink is an ink prepared by adding a diluent to the original ink, or an ink prepared by mixing white ink with other colors. Its mixing method is based on the principle of diluting agent or white ink, supplemented by other color inks, first weigh the appropriate ratio of diluting agent or white ink, and then add the color ink in batches, so that the ink is stirred evenly while observing the change in hue When the degree of diluting is appropriate, use the printing paper to scrape the color sample and compare it with the original, and adjust it until it is suitable. The diluted color ink is distinguished from the hue, and there are also primary color, intermediate color and multiple color. If the primary color ink is used to mix and dilute, just add the primary color ink in batches. However, if it is an inter-color or multi-color, and lacks the experience of adjusting ink, it is best to mix the original ink into the dark ink of the printed hue, and then add the diluent. It is an important technical link to prepare light-colored ink and master the degree of ink dilution.
If the dilute ratio is not enough, it will cause insufficient ink on the surface of the ink roller, the ink color of the printing plate is easy to bloom, the ink layer is shrivelled, and the color is not bright; if the ink diluting is too strong, only the thickness of the ink layer can be increased to achieve the desired hue for printing In this way, it is easy to adjust the ink to make the low-key areas of the layout appear pasted, and the depth can not be distinguished. At the same time, it is also easy to cause the phenomenon of overprinting. According to the product quality requirements and paper characteristics, the matching ink and diluent should be used for the preparation of light-colored ink. It should also be noted that when mixing light-colored inks, for the original inks that are not resistant to light, oxidation, and discoloration, try to avoid using light-colored inks to avoid color instability. In addition, due to the large proportion of white ink, in addition to covering requirements and color matching needs, add a small amount for calling, try not to dilute white ink. In order to prevent the occurrence of quality problems such as poor color stacking and discoloration. When mixing inks, you should also pay attention to the proportion of different inks. For example, if you use lead chromium yellow ink and peacock blue to mix green ink, after a long time, the color ink with a small specific gravity will float up, otherwise it will sink, so it appears "Floating color", if the yellow ink made of organic yellow pigment is used for blending, the above phenomenon will not occur.
In summary, only by learning to master color knowledge and the related conditions and use characteristics of inks and auxiliary materials can we scientifically formulate various color inks to meet the requirements of improving printing quality and production efficiency.
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