Previous knowledge: How do Gift Paper Boxes printing experts mix ink?

Previous knowledge: How do Gift Paper Boxes printing experts mix ink?

Ink blending is also called ink blending or ink blending, that is, adjusting the printability of the ink during the printing process, or using the color material subtractive method to use the three primary colors of ink to blend the ink of the required hue. It is an indispensable and important part of the printing process. Link. Whether the ink is properly blended directly affects the quality of the printed matter. In this article, the author will share with you the basic principles and several practices of Gift Paper Boxes ink blending.

　　Basic principles of ink blending

　　 1. Intensity and light printing

　　Intensity and light printing means that the required ink is adjusted to be slightly darker than the color of the color sample, and the amount of ink is intentionally reduced during printing to meet the requirements of the color sample. This is because the hue of the ink is greatly affected by the thickness of the ink layer. When printing with the same ink layer, when the thickness of the ink layer changes, the hue presented will also change. Especially when the offset printing process is used for printing, it is limited by the offset printing process. The ink layer should be thin, not thick.

　　2. Use as few colors as possible

　　According to the pigment subtractive method, when blending inks, the more types of pigments used, the darker the color of the blended ink. Therefore, it is necessary to use the smallest variety of colorants to maintain the brightness of the ink color. In addition, make good use of black ink and white ink. In any ink, adding black ink will darken the ink color, and adding white ink will reduce the saturation of the ink color.

　　3. Grasp the change of hue before and after ink drying

　　 The hue of the same ink before and after drying is very different, especially for screen printing inks. For example, when a light gray ink is formulated, the color of the color sample scraped out when it is just adjusted is in line with the requirements of the original color sample, but after the ink dries, its color becomes significantly darker. A similar situation occurs with other colors of ink.

In order to avoid this situation, first scrape the color sample when preparing the ink, and compare it with the original color sample after the color sample ink is dried to prevent the color from meeting the color sample requirements before the ink is dried and the color aliasing after drying. Loss caused by color mismatch.

　　4. Focus on more

　　 When deploying any kind of ink, you must first determine the main color based on the original color sample, and use this as the main color, and add auxiliary colors until the color meets the requirements of the original color sample. If the light gray ink is deployed, white ink should be used as the main ingredient, and a small amount of black ink should be added to form light gray ink. If dark gray ink is deployed, black ink should be used as the main ingredient, and a small amount of white ink should be added to form dark gray ink. In actual work, it is necessary to carefully analyze the composition of the ink color of the primary color sample according to the specific situation, determine the main and auxiliary relationship of the ink, and carry out the deployment according to the principle of "mainly more".

Several methods of ink blending

　　 1. Adjustment of ink printability

　　 Fluidity and drying speed are the two main properties of ink, and special attention should be paid to ink blending.

　　(1) Fluidity of ink

　　 Different substrates have different requirements for ink fluidity. For example, a primary color ink, when printed on double-coated paper, its fluidity meets the printing requirements, and when printed on double offset paper, the fluidity of the ink needs to be increased to adapt to the printability of the double offset paper. Under normal circumstances, a substrate with a smooth surface and poor permeability requires low fluidity of the printing ink, while a substrate with a rough surface and strong permeability requires greater fluidity of the printing ink.

　　(2) Drying speed of ink

　　 Ordinary ink drying is mainly achieved in three forms: volatilization, penetration, and surface oxidation and conjunctivation. These three methods are all affected by the temperature and humidity of the printing environment. Therefore, when adjusting the drying speed of the ink, it is necessary to fully consider the changes in the temperature and humidity of the printing environment.

　　 2. Blending of gold ink and spot color ink

　　Gold ink and spot color ink are two special inks. The blending method is different from ordinary ink, so special attention is needed.

　　(1) The blending of gold and ink

　　①The blending of offset printing gold ink

　　 Offset gold ink is divided into cyan gold and red gold. Under normal circumstances, the offset gold ink does not need to be blended, and the original ink can be used for printing directly. If you need to change the color of the offset gold ink, you can add a small amount of other colors of ink to change the hue of the offset gold ink, but it will not affect the printability of the offset gold ink. For example, the color of the cyan gold is not bright enough after printing, and the printed matter looks dull and dull. If a small amount of yellow ink is added to the cyan gold, the brightness of the cyan gold can be increased. It is worth noting that the added amount of other color inks must be small, otherwise it is easy to be adjusted to fake gold ink and lose the color that gold ink should have.

　　②The blending of screen printing gold ink

　　 There are many varieties of screen printing gold ink, and it is more optional. Under normal circumstances, you can directly select the primary color screen printing gold ink. When the hue of screen printing gold ink needs to be fine-tuned, just add a small amount of ink of the required hue to the primary color screen printing gold ink, but the color selection must be appropriate. If the ink color is lighter gold, silver ink can be added to the primary color screen printing gold ink, or white ink can be added, but the gold ink blended with white ink will give people a "fake gold" feeling, so It is best not to use white ink. In addition to the above methods, gold inks of different hues can also be prepared by using gold-adjusting oil and silver glitter powder.

　　(2) Blending of spot color ink

　　When performing spot color proofing or spot color printing, the ink blending personnel need to adjust the spot color ink based on many years of experience. If the blending technique of the ink blender is not good enough, the brightness of the blended ink will be incorrect or the ink will be re-allocated only after the ink is printed on the machine. In addition, because spot color inks have great dry fade changes on offset paper, and the change values of spot color inks of different color systems are very different, we need to constantly adjust on the original basis to explore the rules of dry fade changes, so we It is necessary to have a full understanding of the mixing technology of spot color inks to prevent unnecessary troubles such as quality accidents, ink waste, duplication of labor, and delays in construction due to pure experience.

　　3. Make good use of computer color matching system

　　 After understanding the basic principles of ink blending, in order to complete the printing of products with extremely high color requirements, it is necessary to use an advanced computer color matching system for color matching to meet customer acceptance standards. Nowadays, customers no longer rely on the naked eye to judge whether the printed matter is qualified, but based on the Lab standard value of a given color block or color bar, and the color difference value range is not more than ±1.5. Obviously, the customer's acceptance requirements cannot be met by the experience of the master, but must borrow professional instruments to measure the color blocks or color bars of the printed matter, so the data of the ink formula and the automation of ink color matching must be achieved.

　　 Printing companies need to choose a computer color matching system that meets product requirements based on their own business characteristics. This article takes X-Rite color matching software as an example to introduce the actual usage of computer color matching system. Usually, companies will refine commonly used inks, including ink colors mainly yellow, magenta, cyan, black, green, orange, dark blue, magenta, etc. According to the experimental data, the ink with small dry fade and good stability is selected as the composition of the color matching ink. After receiving the customer's request for the color of the color sample, first use the X-Rite spectrophotometer to input the measured paper color into the color matching system, and then enter the standard value into the color matching system, and the system will automatically analyze and get several sets of color matching schemes. According to the color scheme given by the system, the color sample is presented on the substrate with the aid of a color display, and then the Lab value is measured and adjusted within the standard color difference range. After the result is qualified, the ink is mixed according to the obtained formula and used for batch proofing in actual production.

Since there is a certain gap between the printed color displayed by the color development instrument and the printed color obtained in actual production, the ink adjuster will measure the Lab value of the color block or color bar actually produced by the equipment, and find the law of change, and then use it. The computer color matching system performs complementary color correction, and then produces it on the machine. After qualified, the color matching data is stored for future mass production.

　　 In short, when blending ink, the operator not only needs to gradually explore the method and experience of blending ink in practice, but also make good use of advanced equipment. This will not only improve production efficiency, but also bring economic benefits to the enterprise.

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