A product, especially a newly launched product, is first shown to customers by its packaging appearance. Whether the packaging of the product is good or not, and whether the color matching is harmonious, directly stimulates the first sense of the customer, determines whether it is purchased, and also determines the survival destiny of the product. It can be seen that packaging and printing has increasingly become the most direct factor influencing the fate of products.
In packaging and printing, special attention should be paid to the color's performance. In order to meet the color requirements in design, spot colors are usually used. When printing spot colors, a special ink supply device is required. In the case of limited ink supply devices of printing presses, the need to provide spot colors can only be achieved by cleaning a certain ink supply device and changing the ink, which not only causes The waste of raw materials such as unused ink is also a waste of time due to the need to clean the ink fountain and ink roller. To avoid this problem, some companies conduct relevant research and attempts. After years of development, multi-color separation technology has emerged, and the company can use this technology to replace spot color printing. The multi-color separation technology uses multiple "primary colors" to achieve the effect of printing spot colors when fewer or no spot colors are used. This can reduce costs, reduce the process of cleaning ink supply devices for printing workers, and improve work efficiency. . Next, let us discuss this technology together.
1. Manufacturers using multi-color separation technology and their characteristics
In the field of packaging and printing, companies such as Opaltone and Pantone have developed multi-color separation technology for printing. Here, take flexo as an example to make a brief introduction.
The six inks used in Opaltone's six-color separation technology are: CMY + RGB six colors, with K color removed. The color space represented by Opaltone's CMY tricolor is shown above. After six-color separation technology is used in flexo printing, it will not produce large dot expansion and can obtain the required high density value. And when using sleeve printing plates, registration is not difficult to achieve. Opaltone believes that in color printing, no black version can save a lot of costs, reduce the preparation time of the work, and can also achieve the effect required by the design, that is, the standardization requirements, accurately reproduce the maximum saturated color, and do not lose the color gamut. However, Opaltone has also established a standardized flexo seven-color separation technology. Among the seven-color technology, a black ink is added to the six-color technology.
2. Pantone Corporation
The inks used by Pantone for high-fidelity printing are: C, M, Y, K, and two or four color inks. The seven-color inks used in the HIFI system are: C, M, Y, K and R, G, B. The popular Hexachrome system uses six-color separation technology, and the inks used are C, M, Y, K and green and orange. The Hexachrome system is an independent system, which has its own support base, as well as its own printing characteristics file and Pantone color guide.
The HIFI color system is designed for customers' special requirements and design requirements without increasing costs. By comparing with the larger color space displayed on the screen, more and more saturated colors are printed. The Hexachrome system can print spot colors in Pantone up to 90%, and can print 1000 spot colors at the same time, reducing the cost of decorative inks and eliminating the cost of cleaning the inking device, and printing in small volumes Medium, can better show its advantages. The Hexachrome system can also be converted into traditional four-color printing with a little change as needed. The additional two colors in the Hexachrome system can print out more saturated and brighter colors than the four-color printing, thereby improving the picture quality, providing high-quality printing quality, and making it difficult to print green and orange no longer exist. The skin color expressed by CMYK can be expressed more vividly with the Hexachrome system.
Pantone also produces HexWare software.
HexWare software has two parts: HexImage and HexVector, Hexlmage is a plug-in for PhotoShop, the function is to convert RGB or Lab color space images into six color images of Hexachrome. HexVector is a plug-in for Adobe Illustrator, which mainly handles the Hexachrome color of the graphics part. [next]
Second, the reason for using multi-color separation printing technology
We know that in color separation platemaking, the commonly used method is to divide the original into four color plates: cyan, magenta, yellow, and black (CMYK). From the knowledge of color science: the color space formed by CMYK is the smallest, it is difficult to accurately reproduce the colors displayed on the screen. In packaging and printing, in order to overcome this shortcoming and achieve a certain design effect, it is necessary to use a lot of spot colors. As a result, many companies have considered adding a variety of inks for printing. As in the proofing process, they are not limited to only four inks, so they have produced multi-color separation printing technology for printing production. What are the advantages of using multi-color separation printing technology?
1. Increase the color gamut
Using six-color or seven-color plates, the color space that can be described by printing is larger than the color space of traditional four-color printing, which can significantly improve the printing effect of the image. This is not possible with only four plates , From the picture, we can clearly feel: after using four colors, six colors, and seven colors, the range of color gamut changes, the color of the details that can be expressed increases, and certain design effects in packaging and printing can be achieved .
2. Reduce costs
Using multi-color separation technology, on the basis of true color reproduction, picture clarity and quality comparable to offset printing, it is also possible to achieve a significant reduction in packaging and printing costs and reduce costs.
In packaging and printing, according to the design requirements, it must be printed in special colors. After using multi-color separation technology, adding two or three "primary colors" can meet the printing of most spot colors (generally can reach 90% of the requirements), showing a larger color gamut range, and With spot color inks, it is possible to require three or more ink supply devices. In the commonly used eight-color (flexo) printing press, only up to eight ink supply devices can be provided. If more "primary colors" are added to these ink supply devices, the printing machine does not need to frequently change the printing plate and ink of the ink supply device because of the need to add spot colors, which reduces the production of multiple printing plates and cleaning The cost of the ink supply device also reduces the preparation time before printing. [next]
Third, the limitations of multi-color separation printing technology
However, the multi-color separation technology also has its limitations.
1. Registration and color reproduction issues
In color printing, there is a registration problem. The more color separation plates used, the greater the difficulty of registration, which will affect the printing effect of the final image. The multi-color separation technique is used, and a certain spot color will be overprinted with two to four colors, which will undoubtedly increase the registration difficulty factor than printing only spot colors. Therefore, when using multi-color separation technology, it is necessary to have an accurate registration technology and registration device. At the same time, after solving the problem of overprinting of spot colors, it is also necessary to accurately reflect the tone value of the spot colors. Due to the inevitable errors of the printing press and the printing plate, it is not easy to consider all the factors affecting the quality. Therefore, it is not easy to print the spot colors in the pictures with color separation technology, and it is impossible to easily realize color management.
2. Anilox roller
The printing machine used for flexo printing generally uses a short ink path system. The ink supply system, the main component of which is an anilox roller, transfers ink through the anilox roller.
The control of the amount of ink transfer is achieved by changing the shape, size and depth of the anilox roller. Therefore, in flexo printing, the requirements for the anilox roller are relatively high. Since each set of ink supply device corresponds to an anilox roller, a large number of anilox rollers need to be used. If in four-color flexo printing, only 4 anilox rollers are needed, and in multi-color separation technology, 6 or 7 anilox rollers need to be used simultaneously. The increase in the number of anilox rollers used undoubtedly increases its wear and tear. In the process of use and storage, it is necessary to strengthen the maintenance and maintenance of the anilox rollers.
3. Other aspects
In addition, using multi-color separation technology, there are still some questions:
â‘ What is the specific amount of pure orange or pure green added under the emphasized part of the picture?
â‘¡Is it most of the pictures, the emphasized parts really need to use the new multi-color separation technology to get it?
â‘¢ Can it be achieved: Even if the traditional CMYK four-color printing is used, can the printing effect be improved very well?
â‘£With this method, will you lose the small dots in the bright tones of the picture?
4. Summary
In short, the advantages and limitations of using multi-color separation technology coexist. However, we should see that the multi-color separation technology is developed in accordance with the design requirements, so its positive factors are also significant, especially in joint printing, an additional ink supply device is added for different design requirements It is unrealistic and unscientific. Using multi-color plate-making printing will bring a lot of convenience in actual production. At the same time, the technology can be used for label printing on narrow-format printers. It is undeniable that the use of multi-color separation technology will show its charm more and more!
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