Analysis of manuscripts and application of color theory to prepare spot color inks
When printing spot colors in cartons or other color products, the spot colors in the manuscript should be carefully observed and carefully analyzed. Based on experience and sensory preliminary judgment and measurement, which primary color inks and various colors should be included in the spot colors to be prepared? The approximate proportion of ink. The analysis of color manuscript is to master the most basic principle, namely, the three primary colors are the basic colors of any color. Applying the changing rules of the three primary colors, in addition to the gold and silver colors that the golden light flashes, any color in the spectral colors can be formulated with the three primary colors. However, the process practice shows that there are still certain limitations to relying on the three primary inks to formulate widely different ink colors. This is because, due to manufacturing reasons, the pigments of some inks are not very standard, and even each batch of produced inks inevitably has a certain degree of difference in color. Therefore, in the actual work of ink adjustment, inks of other colors should be appropriately added, such as dark blue, light blue, medium yellow, dark yellow, golden red, black, etc., in order to more accurately allocate ink hue similar to the original. Although there are many types of inks, no matter how, in addition to the three primary colors, other colors are used to supplement the deficiencies of the three primary colors, as long as you master this principle, the deployment of ink is not difficult. After the original color determines the approximate ratio of primary color and secondary color ink, it can be adjusted. If the hue of the prepared ink has deviations, the complementary color theory can be used to correct the hue deviation. If the green phase of a spot color is too heavy, a small amount of red ink can be added to correct its color deviation; if it is too biased to the red phase, a little blue ink can be added to correct it; if the purple phase is too large, a yellow ink can be added to make up; The ink is not black enough, you can add dot blue to increase the blackness.
Method for preparing dark ink
Carton and color box products often need to print dark spot inks, and dark inks often need to add some light-colored inks for proper dilution. When blending, a basic principle should be mastered. Dark ink should be added to light ink first. Do not take deep ink first and then add light ink, because light ink has less pigment content and poor coloring power, only the amount of addition Only in order to change the hue effect of the ink. Therefore, if the method of adding light-colored ink to dark-colored ink is used to prepare, it is not easy to adjust the hue of the ink, and it is often easy to make the amount of ink more and more. The process practice shows that this method is not desirable. When the dark ink is gradually added to the light color ink to make the hue close to the original, you can use the printing paper to smear the ink color sample, and then compare it with the original. If there is still a color deviation, you can add some color ink It is correct until the color of the prepared ink matches the color of the printed sample. After the small samples of ink hue are adjusted, batch ink can be adjusted according to their respective proportions. Use the three primary colors to mix dark inks, you should master their changing rules, such as the equal mixing of the three primary colors ink, you can get a color close to black; the two primary colors in the three primary colors are equal or unequal mixing, you can get a variety of Intermediate colors, the hue of which is biased towards inks with large content ratios; the three primary colors are mixed and mixed in various proportions to obtain a variety of multiple colors; after adding black or other dark inks to any color ink, its brightness decreases accordingly. The hue becomes darker. On the contrary, if white ink or diluent is added, the brightness will increase accordingly.
Preparation method of light-colored ink
Light color inks are also commonly used spot colors in color printing processes. Generally, light colors are prepared by adding a diluent or white ink to the original ink and mixing. When mixing, the diluent or white ink is usually the main color, and then other primary color inks are gradually added. If the primary color ink is used for blending and diluting, just add the primary color ink gradually. If it is an inter-color and multi-color ink and lacks the experience of adjusting ink, you can first adjust the required original ink to the darker ink of the printed hue, that is to say, first adjust the general hue, and then gradually add Dilution agent. When adjusting the ink, pay attention to observe the change of hue while mixing the ink. When the degree of ink dilution is almost the same, use the printing paper to smear the ink color and compare it with the original, until the hue is adjusted before batch batching. It is an important technical control link to prepare light color inks and master the degree of ink dilution. If the dilute ratio is not enough, the ink color of the printed product will easily be printed during printing, and the ink layer will be dry and not solid, and the color of the printed page lacks a vivid sense; It is easy to adjust the ink to make the low-key dots or small text appear on the layout, which makes the printed layout lack layering and clarity, and it is easy to produce quality problems.
Ink preparation and use should pay attention to several technical links
Pay attention to the color with a suitable light source
Whether the color matching (color discrimination) light source of the ink is suitable will directly affect the accuracy of the ink preparation. The color of the light source of the incandescent lamp is red with a yellowish color, and it is difficult to accurately identify the color. The most ideal light source for color discrimination should be uniform natural sunlight. Although fluorescent lamps and daylights are somewhat similar, the differences between the two should also be considered when identifying high-quality color samples. The influence of light on the identification of ink color is not only due to the characteristics of the light source, but also has a great relationship with the intensity of the light and the angle of illumination. Under the same light source, the intensity of the light reflected on the illuminated sample is mainly determined by the distance between the sample and the light source, and the closer is strong and the far is weak. The correct irradiation angle should be that the incident angle is equal to the reflection angle. The light irradiated on the sample sheet will inevitably have some refraction, but it does not have much impact on the ink color. When identifying the ink color, whether it is day or night, the light source should be The irradiation angle is the same.
According to the characteristics of the product, select the corresponding ink to prepare
During the production, use, and transportation of carton and carton products, friction, sun exposure, and contact with other substances (including alcohol-based glazing paints) are inevitable. Heat-resistant, acid-resistant, alkali-resistant and alcohol-resistant inks to ensure the stability of ink color quality.
Consider the effect of product overprinting ink color
The proportion of white ink is large, the hiding power of titanium dioxide is strong, the light resistance is not good, and the pigment is easy to cause stacking and stacking blanket failures, and it is also prone to powder defects when printed on the product. Therefore, white ink is only suitable for printing monochromatic spot color products. Overprinted ink should not be used or used as little as possible. It is best to mix it with a diluent with good transparency to prevent quality problems such as poor color stacking and discoloration.
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Consider the proportion of ink
When mixing inks, pay attention to the specific gravity of different inks. After mixing and mixing, inks with a large specific gravity are prone to precipitation, which affects the stability of printing colors. For example, if the lead-chromium yellow ink with specific gravity is used to mix the green ink with the peacock blue, after a long time, the ink with small specific gravity will rise, while the specific gravity will precipitate. Therefore, yellow ink made of organic yellow pigments should be used for blending, and the above problems will not occur.
Use as few ink types as possible
When blending spot color inks, the more the ink types are used, the worse the vividness of the printed colors. Therefore, if you can use two kinds of ink to dispense, don't use the third kind of ink to dispense.
Make good use of ink color characteristics
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 the orange color to increase the vividness of the ink color. Printing orange color, if printed with orange ink, it will not achieve the bright effect, and the printing is not realistic, and when mixed with gold red and lemon yellow, the printing color is much better. As another example, when printing the green picture of the fruit box, it is advisable to use light yellow ink to prepare it, which can print the leaves with strong green feeling. If it is mixed with dark yellow ink, the dark yellow ink contains red flavor and red is the complementary color of green. The printed leaves will be dull and dull, and the freshness of the fruit will not be well expressed. The packaging effect of the product will be somewhat inferior.
Pay attention to the characteristics of cardboard
In the actual production process, due to the limitations of the supply of raw materials, the samples provided by customers often differ slightly from the cardboard used for printing in terms of gloss and hue. Therefore, when preparing ink, you must fully consider These factors are adjusted appropriately. For example, if the gloss of the printed paper is worse than that of the sample, the ink hue should be lightened appropriately so that the ink will not be darker after being coated enough to cover the concave paper surface.
Pay attention to the ink production record
Make sure to record every batch of ink adjustment. The recording content should include: printing machine type, printing paper type, printing quantity, printing specifications, the amount of various inks and additives, etc. At the same time, print samples should be kept. Recording can provide a basis for the analysis of production data, and can also accumulate ink production experience. In this way, on the one hand, the amount of ink preparation can be controlled relatively accurately, to avoid storage trouble and waste caused by excessive ink remaining; on the other hand It can improve the accuracy of color discrimination. No matter how complex the manuscript is in the future, you can immediately determine exactly what ink needs to be used without chromatographic adjustment.
Note that the same type of ink is used for blending
Due to the difference in characteristics of different types of inks, such as the disparity of ink drying and mixing effects, it may induce some ills and affect normal printing and product quality. Therefore, the same type of ink and the same type of auxiliary materials should be used for blending to improve the printability of the ink.
Pay attention to prevent precipitation of water-based ink
Flexographic water-based inks are liquid and have strong fluidity and are more prone to precipitation. Therefore, in the process of preparing water-based ink, we must pay attention to the ink is fully stirred and sampled to ensure the accuracy of the sampling color.
In summary, ink is an important material that has a greater impact on printing production efficiency and product printing quality. The production process practice also clearly shows that only the correct formulation of ink can better reduce or avoid the occurrence of various quality problems in the printing process. Therefore, as long as we use the changing laws of the three primary colors, apply good theoretical knowledge of color, and at the same time, continuously sum up and accumulate experience in production practice, we can quickly and accurately allocate a variety of hue accurate, bright colors, consistent with the printed sample The spot color ink ensures reliable printing ink color quality of packaging products such as cartons and cartons.
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