In the printing process, no matter what kind of printing, whether it is multi-color or monochrome printing, the first problem encountered before printing is the ink color allocation, so often choose and adjust the ink color. The allocation of ink colors is the most important part in printing. The true reproduction of colors directly affects product quality and market space share. In some large-scale enterprises, not only have a special deployment agent, but also should do the best Satisfy customers. The following explains for you how to improve the quality of ink through ink color mixing skills: Color matching principle Any color is represented by the three characteristics of hue, lightness and saturation, so the above three factors must be considered in the color matching process. Although black is theoretically a complete absorption of light, black ink still has gloss. Ink is grinded by pigment (toner) and resin binder. The pigment particles are surrounded by a layer of nearly transparent resin oil. This layer of resin oil has the effect of refracting and reflecting light, so we can feel that the black ink printed on the substrate still has a certain gloss. Pigment usually accounts for 8-35% of the ink composition, and its amount determines the concentration of the ink, which has a great influence on the ink, such as the relative density, transparency, heat resistance, light resistance and resistance to chemicals of the ink Wait. In the ink color matching process, the ink used should be determined according to the actual printing process, ink layer thickness, printing substrate and other conditions. When selecting the ink, the ink's own gloss, hue, coloring power, and hiding power should be considered. 1) Gloss: Gloss can be measured with an instrument or judged with the naked eye. Usually in the color matching process, only with the naked eye. Gloss actually refers to the degree of the ability of the ink printing sample to reflect light in the same direction after being irradiated by light. It directly affects the appearance of the printing and is a very important indicator. At the same time, when choosing the ink, it is necessary to distinguish whether the ink itself is bright, semi-gloss or matte ink. It should also be considered whether it is the same ink, such as the inner printing ink or the surface printing ink. The same ink must be formulated to avoid mixing errors and cause unnecessary losses. 2) Hue is the basic characteristic of color, used for qualitative distinction. When matching colors, we must first consider whether the hue is consistent. The detection method is usually to scrape the color through scraping paper or simulate printing. Observe and compare the standard and the sample with human eyes. 3) The hiding power is the degree to which the ink covers its background color. The better the hiding power, the worse its transparency. The level of transparency affects the efficiency of ink chromatism and the degree of influence of the printing substrate. 4) The coloring power is a method of indicating the ink concentration. Its measurement is to add a certain amount of ink and then add a certain amount of standard white ink to dilute and mix it, and then compare it with the standard sample. The coloring strength reflects the degree of ink mixing Affect the thickness of the printed film. Through color identification (scraping paper scraping test), you can compare the difference between the ink sample and the standard sample in terms of gloss, hue, and hiding power. The specific method is as follows: put the standard ink in the upper left corner of the identification paper, put the color matching ink in the upper right corner, use a spatula to flatten the thin application part at an angle nearly perpendicular to the scraped paper, and quickly expand the thick application part at an inclined angle. After the ink surface is dry, you can observe the hue of the ink in the thin part, identify the hiding power and transparency of the ink in the black belt; judge the difference in gloss between the two in the thick part and observe the appearance of the entire color. Usually black and color inks are used White scraped color paper, while white ink uses black scraped color paper. When observing the color samples, it is best to compare them under an indirect indoor light source during the day, and it should not be exposed to direct sunlight. When viewing samples at night, it is recommended to use fluorescent tubes for color evaluation and color temperature of 5000 ± 200 ~ K. You can also use self-made mixed light sources: three 6500K400W fluorescent tubes, two 20W blue fluorescent tubes, and six 100W tungsten filament lamps to fix them at Just inside the special cover, it is mainly for easy observation of color samples. Matters needing attention 1) Carefully observe the color sample, pay special attention to the substrate to be printed, and select the ink from the roughness and smooth reflection of the substrate. For example, if the ink is printed on an aluminum plate or a can that is extremely smooth and reflective, choosing an ink with high transparency will help greatly enhance the metallic luster of the ink. 2) When choosing the ink required for color matching, avoid mixing too much ink as much as possible. Use inks that are close to the standard color and made of a single pigment as much as possible. Too many color inks are used for color matching. The farther from the standard color, the worse the brightness. The higher the matte color of the mixed color, it is impossible to modulate the primary color by color matching, so it can be used to mix two types of color matching, instead of three, the less the better. 3) Pay special attention to the coloring power of the ink. If the selected ink density is not high enough, no matter how it is blended, the standard color density cannot be achieved. 4) When you need to add white and black ink, you should pay special attention to the added weight and the accuracy of weighing. In all inks, the hiding power of white ink is very strong. Too much addition will not only dilute the color, but also prevent the bottom. The degree of wood reflection. However, for printing uneven substrates such as nylon cloth and cardboard, it is best to print a white layer as the base color in order to ensure the appearance of the printed product. Because the coloring power of the black ink is extremely strong, a little careless, and adding too much, it is necessary to add a lot of other color inks to adjust the color, resulting in waste, so special attention is required. 5) When making light-colored ink, it should be judged from the degree of light transmission of the ink film how much white ink or ink oil (dilution agent) should be added for color mixing. It is absolutely not allowed to use solvents (diluted water) to dilute the color. Too much solvent added will not only affect the printing performance, but also destroy the ink structure, cause the pigment and resin oil to separate, precipitate or greatly reduce the gloss and brightness of the ink . Blending of dark and light inks The deployment of ink can be divided into the deployment of dark ink and light ink. The so-called dark ink blending refers to the blending using only primary color ink without any diluent. According to the amount of ink consumed during printing, the primary color ink and secondary color ink and their proportion determined by color analysis are used to adjust the primary color ink. Color ink and secondary color ink are blended together evenly. The allocation of dark ink can be divided into three types: single color, intermediate color and multi-color. Monochrome refers to the preparation of a primary color ink. Intermediate color refers to the blending of two primary colors of ink. The compound color refers to the blending of three primary colors of ink. Any ink prepared by adding a diluent is called a light-colored ink. Pay attention to three points during deployment: 1) Use white ink without thinner; 2) White ink is mainly used for color mixing, and a little color ink is added to the white ink; 3) Color selection should be accurate, as follows: Pink: mainly white, slightly pink, fluorescent orange ruby: mainly white, slightly yellow, fluorescent orange red beige: mainly white, slightly dry, medium yellow, blackish light blue: to Mainly white, slightly medium blue lake blue: mainly white, slightly hole blue gray: mainly white, slightly hole blue, light yellow silver gray: mainly white, slightly silver paste, black ink snow green: Mainly white, slightly reddish, royal blue flesh: mainly diluent, slightly transparent orange, medium yellow ivory: mainly dilute, slightly yellow, peacock blue, orange red. How to improve the gloss of ink film 1) Add an appropriate amount of ink oil within the allowable range of color density; 2) Coat with varnish or ink on the surface of the printed film; 3) Increase the transparency of the ink, choose high transparency ink or add appropriate amount of adjustment oil, use smooth, strong reflection, the reflection of the substrate increases gloss: 4) Prevent the adsorption of the substrate surface and improve the smoothness of the printed surface of the substrate reasonably; 5) Pay attention to the temperature and humidity of the printing environment. When the humidity is high and the temperature is low, when the plastic gravure printing is performed, the solvent volatilization speed is fast, and the water vapor in the air is rapidly condensed due to the absorption of heat around the ink film, which causes the printing Fog forms on the surface of the ink film, causing the ink layer to tarnish. In the rainy season, special attention should be paid to controlling the temperature and humidity of the printing environment to ensure good printing results. Normally, the room temperature is preferably 21-23%, and the humidity is preferably controlled at 40%, which helps the true reproduction of colors. Special color production 1) Production of gold and silver inks: Add appropriate amount of gold powder and silver powder by mixing ink and mix well. Attention should be paid to the selection of gold powder and silver powder with appropriate fineness, and the ink-adjusting oil suitable for the printing substrate should also be selected. Ink can also be made by mixing silver powder with transparent yellow and ink-adjusting oil. 2) Pearlescent ink: Pearlescent pigment is mixed evenly with an appropriate ratio of high-transparency ink or ink-regulating oil. The hiding power of the ink is strong, and the pearlescent effect may be lost. 3) Luminous ink: The ink has the effect of radiating light after absorbing light energy for a certain period of time, so it can often emit light at night. It is called luminous ink or phosphorescent ink. Generally, the luminous pigment is dispersed in the ink with high transparency, and it can be stirred evenly. None of the above inks can grind gold ink and silver ink. Grinding will damage the grinding equipment. Pearlescent, luminous, and ink grinding will destroy the surface or crystal structure and lose the desired effect. Toning of plastic printing 1) Printing ink color mixing should use the same type of setting ink produced by the ink factory as much as possible. The color of the setting ink is higher than the color of the two color inks; 2) If you want to use 12 kinds of inks for color matching, you should try to use the setting inks with similar colors as the main color; 3) When matching colors, the variety of inks should be reduced as much as possible. Because the more color types of color matching, the higher the achromatic ratio will reduce the brightness and chroma of the ink color. ; 4) The plastic film is a non-absorbent material, thinner can not be used to dilute the color ink, white ink should be added to dilute it; 5) Different manufacturers and different types of inks are not mixed. This will affect the gloss, purity and drying speed of the white ink. To sum up, when distributing ink colors, we must carefully grasp each pass to be able to formulate good colors. PVC Coated Hexagonal Wire Mesh
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