In general, it is impossible to change the color of the proof sheet to the same hue as the ink. It can only be said that the color of the blended ink is as close as possible to the color of the proof sheet.
First, the law of color change
The basic knowledge of color science that must be mastered in blending inks.
1. The formulation of the ink is carried out by using the principle that the three primary colors Y, M, and C of the color material can be mixed in a certain ratio.
2. The three primary color inks Y, M, and C can be mixed in black in equal proportions, and different proportions of the thinner can obtain different degrees of neutral ash.
3. The three primary color inks Y, M, and C can be mixed in different proportions to obtain inter-color or multi-color of different hue. The inter-colors of the three primary colors of Y, M, and C are R, G, B, Y, M, and C are complex colors. Note that the hue of the blended color is biased towards the hue of the ink with a large ratio.
4. The two primary colors of ink are mixed in equal amounts to obtain a standard color.
Second, the color matching method
1. Chromatographic color scale comparison method. For example, the full-page spot color on the color draft has a ratio of the amount of ink with the color from the chromatogram and the color mark. From the chromatogram, you can find the number of dots in the Y, M, and C versions of the halftone dot color.
2, the comparison method of color three attributes
Compare the brightness, hue, and saturation of the ink color of the color sample.
1 If there is a gap in the brightness, it can be corrected by adding a thinner; 2 If there is a gap in the hue, a certain color can be corrected by the complementary color rule, but this will increase the neutral ash and reduce the blackness.
Third, the specific requirements of the deployment of ink
1. The hue of the ink must conform to the color scheme of the decoration design, try to narrow the gap and strive for the same color tone.
2, the ink is too thin and too thick to be properly formulated, the ink should have a certain viscosity and fluidity.
3, full version of the field of tobacco, wine packaging and decoration, trademarks must be added a certain amount of red, white dry oil, can not exceed 5% of the amount of ink, dry oil added more will appear crystallization phenomenon, affecting the color of the dull, dry If the oil is added less, the back side will be dirty. Therefore, the amount of dry oil should be appropriate and must not be too much or too little.
4. Select inks with excellent texture. The properties and hue of inks of different manufacturers are different. It is best to choose a manufacturer's ink products.
5, when adjusting the ink should consider the nature of the printed paper, the paper is rough, the ink absorption is strong, the amount of ink consumed during printing is large, and the difference in temperature is controlled to increase or decrease the input of dry oil.
6, the required ink is required to be used at one time, a little surplus, to avoid the amount of ink is not enough to use the redeployment, the printed hue is different, the amount of ink is more wasteful of the original ink.
7. For the color draft of the package design, carry out detailed analysis, strictly calculate and master the ratio of the original ink and the added thinner.
8. After the ink is transferred out, the color samples printed on the machine should be carefully compared with the color draft. The hue error should be corrected in time. When the ink is changed, the ink fountain and the ink roller should be cleaned. In general, it needs to be cleaned many times. Avoid ink washing and color change is not clean to make the ink color cast problem.
9. Record the proportion of the blending ink and the amount of ink to be detailed, so that the stub is archived, and the next time the printing is repeated, it is used as a reference.
Fourth, the method of blending light-colored ink
Any inks formulated with a thinner, white ink, or virgin oil are collectively referred to as light-colored inks. The preparation process is as follows:
1. According to the analysis of the color draft and the ink color sample, the operator can first determine the required ratio according to the percentage ratio of the coloring agent and the primary color ink on the color standard, so as to know the number.
2. Add the primary color ink gradually in the thinner, and judge whether the ink color is qualified by comparing the ink color.
3. It should be noted that the light color ink should be blended in the thinner, and the thinner should not be added to the primary color ink, because the primary color ink has a strong color-developing ability in the thinner, and the original ink concentration is not well mastered, thereby wasting ink. At the same time, it is not easy to adjust the ink.
4. When the light ink is blended, the first test is to carry out a small amount of trial adjustment. After the hue reaches the color of the color draft, a large amount of ink is adjusted according to a small amount of test ratio data parameters.
5, under normal circumstances, the printing of brightly colored packaging and decoration in the field, in order to achieve a glossy, product color is even and thick, you can use white ink and Wei Li oil as a thinner.
6, the need to color the field, the light agent inside the brightener to blend, so as not to affect the color effect of the former color.
Fifth, the method of blending dark ink
Formulated with dark-colored inks, only dark inks, and inks that are rarely used with a thinner are called dark inks. The deployment process is:
1. According to the color of the color original, the ratio of the primary color to the secondary color can be determined according to the percentage on the color standard.
2, the number of printing to determine the weight of the blended ink, the proportion of the primary and secondary color ink of the ink adjustment, varnish, dry oil, ink model, quantity, manufacturers detailed registration.
3. According to the theory of subtractive color method, the type of primary color ink should be used as little as possible during the ink adjustment. The color that can be adjusted by the two original inks is preferably not adjusted by three primary color inks, avoiding the use of the original color inks and reducing the ink. The transparency affects the vivid color of the product.
4, when adjusting the dark ink, one should refer to the ratio on the color standard, and the second is to first use a small amount of primary color ink for debugging, the ink color of the prepared ink reaches the requirements of the color draft, and then the ink is adjusted in large quantities.
5, blending deep color inks, sometimes need to add a small amount of black ink for blending, in order to achieve the desired color effect.
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