In the process of preparing inks, it is necessary to master the changing rules of the three primary colors, apply good color knowledge, practice carefully and analyze and summarize, in order to quickly and accurately dispense color inks with excellent phase accuracy, bright colors, bright colors and good printability Improving product quality lays a solid foundation.
Factors to consider when formulating ink
When formulating gravure printing ink, the resin pigment must be determined first, and then the solvent is selected, which is an important principle for formulating ink. The following factors are mainly considered in the preparation:
1. The speed of the printing machine;
2. Types of substrates;
3. The circulation path of ink;
4. Climatic conditions, generally normal drying requires a temperature of 25 ~ 30 ℃ and a relative humidity of 65 ~ 75%.
Requirements for the prepared ink
The gravure ink prepared according to the above principles must meet the following requirements:
1. It has bright hue, high saturation, good transparency or opacity;
2. It has good printability, that is, good leveling, transferability, adhesion and appropriate viscosity;
3. It has a suitable drying speed to adapt to overprinting and rewinding;
4. It has good flexibility, friction resistance, heat resistance, solvent resistance and processing resistance.
Operation method of blending ink color
When blending inks, it is necessary to determine which kinds of inks should be used for blending according to the hue analyzed by the original. For example, if you want to adjust the lake blue ink, it can be adjusted based on visual observation and practical experience. Among them, white ink is the main color, and peacock blue is the auxiliary color, and it should be slightly added. If you want to adjust the olive yellow-green ink, you can be sure that it is mainly white ink, plus light yellow and peacock blue and slightly pink. As long as the main color is determined, the other colors are auxiliary colors, which should be gradually added in small amounts and stirred evenly. Then, use one of the two pieces of paper to apply one point of adjusted ink, and use another piece of paper to scrape it to the thickness of the printed ink layer, that is, compare it with the original to see if it is suitable. When comparing samples, it is necessary to scrape the ink layer on the paper surface where the ink layer is relatively thin and light to see it accurately. When adjusting the ink, you must also master a principle, that is, use inks of different colors as little as possible, that is, if you can use two inks, do not use three inks to adjust, so as not to reduce the gloss of the ink. On the other hand, the scratch tone of the ink is slightly darker than the original color, so that the printed color sample can be more accurate. After the color tone of the sample is accurate, you can adjust the ink in batches according to their respective proportions of ink, to ensure the quality of ink adjustment and improve work efficiency.
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