The hue of the ink is one of the key indicators that affect the quality of the printed matter. Therefore, the ink preparation becomes an essential process before printing. The basic principle of color matching is based on the theory of color synthesis and color mixing, and the effect of different colors of the same color is obtained by the method of color material reconciliation. With the development of computer technology, computers can store large amounts of data, have high-speed computing capabilities, and can use the theory of colorimetry to process a large amount of basic ink data and color values, and match colors through human-machine dialogues. High, it will be introduced into the printing field, which will make the color management and quality inspection more modern.
First, ink color matching method
1. Experience color matching
The empirical color matching method is based on the experience and sensation of a colorist only in the absence of a colorimetric instrument, and is based on the experience accumulated by a colorist in practice. The color matching in the middle and later stages is based on 10 basic color patterns. Or print chromatography as a reference for visual color measurement. The empirical color matching method is often affected by the physiological, psychological and other objective conditions of the color matcher, and the quality of the product is difficult to maintain stable. In addition, relying on experience and feelings of color, can only be qualitative, can not be quantitative, technology communication and exchange more difficult.
2. Mechanical color matching
The mechanical color matching method is a more advanced color matching method that has gradually become popular in modern times. In the various aspects of color matching, certain mechanical and instrumental instruments are used as configuration and measurement tools. By drawing a curve chart as a reference for color matching, the color matching work is relatively accurate. In the range. This method has changed some of the blindness of past experience color matching, so that the color matching speed and quality have improved, but the color matching accuracy is low and the error is large.
3. Computer color matching
Computer color matching has been in foreign countries for about 30 years, and it has been applied in many color applications at home and abroad. People use the connection between the color database stored in the computer and the related color matching software to analyze and process the color data on the sample draft. Through calculation, correction, and color correction, the color formula suitable for the sample draft requirements is selected and the ink is automatically completed. Color matching. Computer color matching requirements The standard color samples and the color of the dispensed ink samples are all represented by numbers, which ensures the accuracy and uniformity of each color matching, and greatly saves the color matching time. Convenient, fast, rapid and accurate are the advantages of computer color matching. . However, the color matching software developed by different companies and companies is based on actual production and application conditions. There is no uniform standard. This is one of the reasons why computer color matching cannot be popularized.
Second, the development and characteristics of computer color matching
1. The development of computer color matching
In industrialized countries, color-related industries such as textile printing and dyeing, dyes, pigments, paint manufacturing, plastics coloring, and ink industries generally use computer color matching systems as a powerful tool for product development, production, quality control, and sales. The rate is high. For example, Infineon Macbeth ink formulation software InkFormulation 4.0 has been developed by foreign optical instruments companies in recent years. This software can be used to formulate precise formulations for the offset, flexo, screen, and rotogravure industries with automatic recipe generation. Features such as fast multi-channel calculations enable rapid formulating of low-cost recipes. The software window has a user-friendly interface to ensure accurate formulation and success rate of one-time preparation.
In the past 10 years, various types of color matching systems have been introduced in China, but few significant benefits have been achieved. The software developed abroad is based on the characteristics of European and American processing industries. The quality of pigments is relatively stable. Although the domestic processing industry has its own characteristics, the stability of the quality of pigments is relatively poor, and the variety of pigments is constantly updated. A large number of new types of substrates have emerged, and the existing color matching systems at home and abroad lack flexible adjustment capabilities. Therefore, practical applications of color matching systems have encountered difficulties.
Shenyang Chemical Research Institute began to study the color matching system from 1984. Among them, the thinking color matching Chinese software is the earliest Chinese color matching software. With this software system, the total price for the domestic machine is 1/3 of the total system. If it is matched with the imported machine, the total price is 1/2 of the import. The system is now used by more than 70 manufacturers and covers a wide range of coloring-related industries such as dyes, printing and dyeing, wool spinning, knitting, paints, inks, rubber, and wallpapers. In addition, Xi'an University of Technology has developed a density computer color matching system that uses color densitometers and computers, which has the convenience and popularity of popularization and application. From the current development trend, computer color matching has become an important part of the future ink color.
2. The characteristics of computer color matching
(1) It can reduce the color matching time, reduce the cost and improve the color matching efficiency.
(2) The correction formula can be calculated in a shorter time.
(3) Store all the ink colors that have been used in the past into the database and use them immediately when needed.
(4) Easy to operate.
(5) The color correction formula and the color difference calculation are all digitally displayed or printed out by the computer. The final color matching results are also stored in the memory in digital form.
(6) Other functional systems can be connected. For example, the weighing system can be connected to minimize the weighing error, and the reproducibility is improved. If the process flow is continuous, a print quality monitoring system can be set on the print product. When any abnormal situation occurs, it will immediately Shut down and reduce unnecessary waste.
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