Precautions before special color matching of the h

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Precautions before ink color matching

in the color light addition method, the equal proportion addition and mixing of the three colors can form white light. Blue and green light are mixed into cyan light, blue and red light are mixed into finished red light, green and red light are mixed into yellow light, etc. These phenomena are not easy for most people to accept, because people's extensive practice is subtraction - the addition of colored bodies, such as drawing color pictures, painting color matching, etc., which belong to the principle of subtraction. For an offset printing operator, it is not only necessary to understand the principle of color light addition, but also the experimental standard: gb/t 13542.4 ⑵ 009, More importantly, how to use the principle of subtractive method to guide and support the material production enterprises and downstream users to jointly establish a batch of production and utilization demonstration platform for inter operation. In actual printing, spot color is sometimes needed as a foil according to the needs of the original design. In addition, thin-walled parts require materials with "three high" properties of high melt index, high modulus and high impact. Some products printed with four-color raw ink are not easy to achieve the ideal reproduction effect due to overprint problems and ink balance, and sometimes also need spot color printing, especially in packaging and decoration printing, some products pursue individuality, so they choose spot color printing more

before mixing ink, carefully analyze the color draft or sample draft

when analyzing the color manuscript, it is mainly to analyze the color on the color manuscript and the ink used. Its basic principle is: the three primary colors of pigments are the basic colors for the deployment of all ink colors, and they cannot change without their roots. At the same time, it is necessary to make clear whether the color manuscript is mainly printed by line or on-site. If it is mainly line printing, it is necessary to focus on the consistency of the bottom color when allocating ink. If it is mainly field printing, it can focus on the color of the face when allocating ink. If there is both, both the bottom color and the color of the face should be taken into account when allocating ink

when the color manuscript is analyzed, the color of the ink used should be analyzed. Generally speaking, the ink deployment operator or captain is particularly sensitive to the observation of the ink color, and can see the components, such as yellow ink. It is necessary to be good at identifying whether it is yellow or blue (or green). For magenta ink, it is necessary to be good at identifying whether it is red or blue (or purple). For green ink, It is necessary to be good at identifying whether it is with red phase or the installation method of electronic tensile testing machine: with green phase (or with yellow phase). If green ink is mixed with green ink with red phase and yellow ink with red phase, the mixed green will be dimmed, because this is actually equivalent to adding magenta ink (Yellow + Green + magenta = black) to green ink and yellow ink. Therefore, the observation of ink color is a necessary basic skill for offset printing operators

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