Talking about the Preparation of Indian Iron Spot Color Inks

The deployment of Indian iron spot color ink is a relatively high-tech job in Indian iron companies. Quasi-provisioning of spot-color inks is of great significance for Indian iron companies to increase their efficiency and reduce the scrap rate. At present, over 90% of the printed iron products that we have seen are printed with spot color inks. That is to say, in Indian iron companies, the deployment frequency of spot color inks is high, which requires the ink dispensers to accurately dispense The color required by the customer produces a printed product that meets the customer's requirements.

The printing ink company's ink dispensers not only need to understand the principle of color light addition method, but what is more important is how to use color subtractive color principle to guide the actual work.

The theoretical basis for the deployment of spot color inks

The basis for the deployment of spot color inks is subtractive coloration. Theoretically speaking, the three primary colors of pigments - cyan, magenta, yellow, and black - are the basic colors for deploying all ink colors, and can be used to deploy all colors in the world. However, in reality, this cannot be done because the three primary colors of ink The color gamut of the spot color ink that can be dispensed is too narrow, and it is far from satisfying the requirement for spot color in the printing iron. Therefore, in practice with spot color inks, often with some color ink with three primary colors ink to adjust the matching, so that the deployment of the spot color ink color gamut will greatly increase, you can show more and more rich colors.

Carefully analyze the sample draft before deploying spot ink

Prior to the deployment of spot color inks, the first step should be to analyze the samples, which is very important for the deployment of spot color inks, because there are many important color information on the sample. When analyzing the sample drafts, it is mainly to analyze the hue of the spot color inks used in the sample drafts, the color cast and whiteness of the white cocoa pigments, and the inks and white cresols used in the customer's sample drafts may be related to the inks and cresols used in our actual production. There is a difference. This requires that the fitter must make appropriate compensation in the deployment process. For example, the sample provided in the room has a spot color that is bright red, and the brightness of the white Coding used in the sample is less than the brightness of the white cretin in the room sample. Therefore, when red is allocated, it needs to be brighter than the red of the sample. When printing, we can ensure that the print and customer samples are close in color. For another example, there is a yellow-green color in the samples provided by the guestroom. We should note in the analysis that the yellow-green color is a relatively bright green color, and the reddish ink cannot be used in the deployment, otherwise the green color will be dark.

In general, ink conditioners should be particularly sensitive to the observation of ink color, can see the ingredients, for example, for yellow ink, to be good at identifying it is reddish phase, blue or green; for magenta ink, be good at identifying it It is yellowish phase, blue phase or purple phase; for blue ink, it must be good at identifying it as reddish phase, yellow phase or green phase. If the green ink is blended with the red ink of the reddish phase and the yellow ink of the reddish phase, the resulting green color will become dark, because this is actually equivalent to adding magenta ink to the blue and yellow inks, Color observation is an essential basic skill for ink conditioners.

Basic principles for dispensing spot inks

Whether it is a dark or light spot color ink, the basic principles should be followed when deploying. This basic principle is based on the principles of printing chromatics and printing technology. The main contents include the following points.

(1) Try to use the same type of ink and the same type of auxiliary materials. In addition, do not use three primary colors of inks that can be formulated with two primary color inks. Similarly, if you need to use a certain color to match, you also need to use the intermediate color ink, so as not to reduce the brightness of the ink. When deploying dark ink, the main color ink should be placed in the ink tray according to the proportion of the ink, and then auxiliary colors and necessary auxiliary materials should be gradually added.

(2) Where inks are mainly made of diluting agents or white ink, inks of primary or dark inks are collectively referred to as light inks. The preparation method of light ink is slightly different from that of dark ink. Dark ink should be gradually added to light ink. Dark ink must not be taken before dark ink is added because light tinting power of light ink is poor. The method of adding and disposing light ink in dark ink makes it difficult to align the hue, and tends to make the ink higher and higher.

(3) Before deployment of spot color inks, a small color sample must be prepared. This means that the color of the ink to be used is determined based on the initial color of the sample draft, and then a small amount of ink is taken from each color ink and accurately weighed using a balance and placed on the ink adjustment table. After the deployment is even, use a scratch paper or color-developing instrument to make a sample, compare it with the sample draft, and make relevant records and keep it properly.

(4) When color mixing spot color inks are used, the complementary color theory is used to correct the color shift. For example, when the color of a certain multi-colored ink is heavy, the yellow ink may be corrected; if the red color is heavy, the blue ink, the peacock blue ink or the sky blue ink may be added to correct; if the black ink is yellow, the blackness is not enough, A slight amount of light-emitting blue ink is used as a color-reducing material, because the blue-light-emitting ink is a blue ink with red light, which is helpful to increase the blackness of black.

(5) Grasp the hue characteristics of commonly used inks. In the actual operation, we must master the hue characteristics of commonly used inks. For example, in the deployment of light green ink, the use of blue-green ink deployment should be adopted, if you do not need reddish blue ink, will inevitably use the deployment of pale green ink color is dark, not bright; the same reason, you can not use reddish Yellow ink, the use of partial yellowish ink is better. For another example, gold orange red ink should be used as far as possible when red ink is used because the red hue of gold red ink is red yellow, which can increase the vividness of the ink.

(6) Pay attention to the proportion of different inks. In general, the proportion of ink is different, inks with similar proportions are easy to mix, and inks with large differences in specific gravity can cause printing defects. For example, the green ink formulated with a heavy lead-chrome yellow ink and peacock blue ink is put for a long time. The ink with a small specific gravity will float, and the heavy ink will sink, and the "floating color" ill will appear. If you use organic yellow ink to mix, eliminate the ills. In addition, due to the large white ink ratio, in addition to cover requirements and color needs to be added in a small amount, try not to dilute with white ink, to prevent the occurrence of poor color, fade and other quality problems.

(7) When using spot color inks for small color samples, use white cocoa to keep consistent with the white chocolate used during printing, and avoid the color differences caused by the different colors of white cocoa pigments.

(8) The deployment of spot-color inks should follow the principle of “dark-printing”, which means that the color of the customer’s sample drafts should be achieved with as little ink as possible.

(9) When deploying dark ink, it is not necessary to use other inks when black ink is formulated to achieve a deep effect, because the price of black ink is relatively low, which can reduce the amount of color ink and reduce the cost.

(10) Take into account the characteristics of post-press processing. When selecting the ink, consider the post-press processing conditions. If the printed product requires a weld, the ink near the edge of the weld should be selected as a non-fading ink. If the printed product needs to be cooked at high temperature, the heat-resistant cooking ink should be selected.

In a word, in the preparation of the printing iron, it is very important that the spot color ink be accurately matched with the production. However, the printing ink is a kind of special ink, there are many factors that affect the hue of the ink, and the deployment of the spot ink is very complicated. Therefore, it is very important to correctly grasp the method and basic principle of printing ink spot color ink.