Whether it is offset printing, gravure printing, flexo printing process carton face paper, or the use of offset printing (printing fine corrugated cardboard), flexo printing process to corrugated cardboard directly printing production process, in order to make the product color plate printing hue and If the originals are consistent, the ink must be accurately adjusted. It can be said that the quality of the ink preparation work not only affects the production efficiency of the machine, but also directly affects the printing quality of the product. Therefore, it is a very important technical control link in production to accurately allocate color printing inks and correctly master color knowledge and ink adjustment process skills. Use the principle of three primary colors to prepare ink The colors yellow, blue, and red are the most basic colors in the color spectrum, which is what we usually call "three primary colors." The three primary colors are the basic colors of any color, that is, no matter what color, they are always within the range of the three primary colors. Therefore, the use of different proportions of the three primary colors can be deployed in countless colors. The change of the hue of the ink is the use of the change of the three primary colors. For example, the equal mixing of the three primary inks can obtain a color close to black; the two primary colors in the three primary inks can be mixed in equal or unequal amounts to obtain various intermediate colors. , Its hue is biased to the ink color with large content ratio; if the two primary colors are mixed and mixed in equal amounts, it can become the standard inter-color. The three primary color inks are mixed and mixed in various proportions respectively, and a variety of multiple colors can be obtained. The above-mentioned primary color inks are formulated into various colors based on the theory of subtractive color method of the three primary colors. Therefore, using the principle of three primary colors to mix inks, it is easier to mix various spot color printing inks. Three primary colors of ink are mixed and mixed in equal amounts and white inks of different proportions are added to make various color light inks; when any color ink is added with black or other dark inks, its brightness decreases accordingly, and the hue becomes darker dark. On the contrary, if white ink or diluent is added, the brightness will increase accordingly. The blending of any hue is based on the three primary colors, and the diluent just adjusts the shade of the hue. The 10 basic dark color maps refer to the most simple and clear and intuitive combination of saturated three-primary color inks, so that they are mixed in equal amounts into a representative dark ink, which is also the most common color in spot color ink formulation. These basic dark colors can be divided into three types according to the number of mixed primary inks, a total of 10 types, including the three primary colors of yellow, magenta, and cyan (usually expressed by Y, M, C) plus three intermediate colors of red, green, and blue (R, G, B) plus four compound colors of magenta, bronze, olive green and black (BK). The 10 basic dark color maps are composed of three equilateral triangles of different sizes, in which the inner triangle is the primary color layer, and the three vertices are the three primary colors. The middle triangle is the intermediate color layer, and the three vertices are the intermediate colors mixed by two adjacent primary colors, such as Y + M = R. The big triangle is a compound color layer, and the three vertices are compound colors obtained by equal mixing of two adjacent colors, and are also the result of mixing three primary colors in different proportions, such as R + G = (Y + M) + (Y + C ) = 2Y + M + C = Bronze. The black in the center of the triangle can be obtained by mixing the three vertices of any layer in equal amounts. Although there are countless colors of color inks, but the ever-changing colors, each color can almost be similar to one of the 10 basic dark colors. As long as we understand and master the relationship between these 10 basic dark colors, we can lay a solid foundation for the accurate and rapid deployment of spot color inks. According to printing chromatogram It is a more intuitive method to find colors according to the color of the printed color spectrum. However, if the color and gloss of the printed paper and cardboard are different from the color of the color spectrum, color comparison will produce a certain error. Therefore, the color ratio of the chromatogram can generally be used as a reference. As long as the general hue is found, you can refer to the ink color and its ratio provided by the chromatogram, and master the ink adjustment scheme as appropriate. Each color block in the color spectrum has an area percentage indicating the primary color dots. You can refer to these values ​​to determine the proportion of each color ink in the original color sample. Through calculation, the amount of ink used can be obtained, that is, the percentage of the area of ​​the white paper left after removing the content of the three primary colors per unit area is the content of white ink. If the standard color sample is similar to the light blue spot color composed of 30% blue dots, the calculation method is: C: W = 30%: (100% —30%) = 30%: 70% = 3: 7. Then, When blending, 3 parts of primary color blue and 7 parts of white ink are mixed to make light blue. [NextPage] Whether it is a printing production staff or a professional ink adjuster, mastering the basic knowledge of color is the basis for good ink adjustment work. Master the three attributes of color Brightness, purity and hue are the three attributes of ink color, and are also the basic elements that affect the quality of printing ink color. The lightness of the color refers to the degree of lightness and darkness that the human eye can see, corresponding to the reflectivity of the light, the brightest is white, and the darkest is black. The gray between the black and white colors is combined into a sequence of brightness levels The 10 levels of lightness are represented by numbers from 0-10. In the seven colors of the spectrum, the order of lightness from high to low is: yellow, orange, green, cyan, red, blue, and purple. High brightness can give people a bright and open feeling, and low brightness can give people a simple, low feeling. For color cartons and other packaging products with different uses, the spot color layout is often based on the characteristics of the product and the user's requirements for color brightness to determine the color brightness. If the brightness is higher, add a little diluent or white ink; otherwise, add a little dark ink. Purity refers to the vividness of ink colors, also known as color saturation or saturation. The size of the ink color depends on the ratio of the pigment composition to the binder or solvent, so when the high purity ink is added with additives, water (water-based ink) or white ink, its purity is reduced. The purity of the same ink color is different due to the different surface gloss of the substrate. For example, the same ink is printed on cardboard with high smoothness compared with cardboard with rough surface. The printed colors are much brighter than the latter. Therefore, in order to improve the vividness of the carton product printing, the vividness of the printed matter can be improved by processes such as laminating and glazing. Ink color hue refers to the appearance characteristics of color, which is determined by the dominant wavelength of colored light. Usually the main hue of colors are: white, yellow, green, blue, scarlet, golden red, purple, black, etc. Except for black ink, which does not have a hue bias outward, other colors will have a hue bias problem, such as yellow with a reddish phase, and a bluish equal. The same ink hue, due to the color difference on the surface of the cardboard, the color will also be different after printing, especially white cardboard and white cardboard, in fact, they are not pure white, often with yellow or blue in white; Red with red or green with white is equal. The author has been deeply touched by this in many years of production process practice. Therefore, when using the same spot color ink, due to the difference in the hue of the surface of different batches of cardboard, the hue of the ink must often be readjusted to make the printed hue meet the requirements of the sample. The production process practice shows that the brightness, purity and hue of the ink color are complementary to each other, as long as one of the attributes changes, the other two attributes will also change accordingly, so pay attention to the correct grasp when adjusting the ink. Understanding of inter-color, multi-color and complementary color inks Intercolor ink is a color prepared from two primary colors ink, also known as secondary color, such as yellow and blue can be mixed into green; yellow and red can be mixed into orange; red and blue are mixed It can be changed to purple, so that the three colors of orange, green and purple are intermediate colors. The inks prepared by the three primary colors in different proportions, and the colors prepared by the inter-color and inter-color inks are called multi-color or tertiary color. There are many kinds of ink complex colors, and the colors can be ever-changing. Many colors in nature are complex colors. Complementary color refers to the complementary colors of one primary color and the other two primary colors. For example, red and green, orange and blue, yellow and purple are complementary colors. The characteristic of complementary colors is to put them together, which can better bring out the bright colors of the other party and the strong contrast of the colors. If they are mixed, they will appear "dirty", that is, the colors are not very vivid. Therefore, in the design of the color carton printing layout, we should pay attention to this feature, and we should carry out color matching and layout design according to the characteristics of the product. Blending of intermediate and multi-color inks Mixing and blending with different proportions of the two primary colors inks can produce many kinds of intermediate colors. If the primary color pink and primary color yellow ink are mixed and mixed in 1: 1, a big red phase can be obtained; if they are mixed and mixed in 1: 3, they can get a deep yellow; if they are mixed and mixed in 3: 1, they can get a golden red phase; Equal amount of blue can be mixed and mixed to get green; if it is mixed with 3: 1 to get emerald green; if it is mixed with 4: 1 to get apple green; if it is mixed with 1: 3 to get dark green. If the primary color red and the primary color blue are mixed and mixed in a ratio of 1: 3, a dark blue purple can be obtained; if they are mixed in a ratio of 3: 1, an approximate green lotus color can be obtained. By mixing various primary or intermediate color inks, a variety of multi-color inks can be prepared, such as; the primary colors pink, yellow and blue are mixed in equal amounts to obtain approximately black; pink 2 parts and yellow and blue 1 each It can be mixed and mixed to make brown red; 4 parts of pink and 1 part of yellow and blue can be mixed to adjust brown and red; 1 part of pink and yellow and 4 parts of blue can be mixed to adjust dark green hue ,and many more. The proportion of various primary color inks determines the hue bias of the blending color, which primary color ink is used more, and the hue of the printed color is biased to which color.
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Mixing inks based on 10 basic dark color maps
Master the three attributes of color and other knowledge related to color 