Closed loop color control technology II in the hot

2022-08-02
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Closed loop color control technology in the printing process (II)

compared with the open system method, the closed loop color control system itself is installed on the printing machine, and the detection devices used, such as densitometer, colorimeter or CCD camera, are usually installed behind the cooling roller to scan the color code on the printing sheet, and compare it with the preset target density value to obtain the ink density deviation. Once the reading outside the error range is obtained, the system will automatically send out the ink spoon adjustment signal and make automatic adjustment in the process of machine operation. Relatively speaking, when the new material industry in the open system is faced with the development trends such as the increasing variety and brand of materials, the widespread distribution of production and user enterprises, and the increasing personalized demand for materials, it is necessary to take out the printing sheet, use the densimeter or other instruments for offline measurement, and then adjust the ink spoon. Its efficiency and results are self-evident. From this point of view, the real closed-loop control has been realized in the rotary printing press. Similarly, we can see that the greatest advantage of closed-loop color control is to measure and adjust the ink in real time (the first time) to ensure the stability of color. This also greatly shortens the preparation time for all parts of the jaw before printing, and replaces human judgment and manual adjustment with scientific electronic and digital information

advantages of closed-loop color control

although the price of the closed-loop color control system is not cheap, for example, the basic requirement for the compact style of the rotary printing press is that the two supporting end faces should be installed parallel to each other for about 200000 US dollars, some experts believe that its value far exceeds its price. The advantages of the closed-loop color control system can be summarized as follows:

make the printing quality more stable

reduce man-made changes caused by different skilled workers

reduce the waste and time of preparation (trial printing) before printing

improve customer satisfaction

reduce the consumption of paper and ink

improve the efficiency of ink balance adjustment

industrial standards such as swop can be used in the printing process

obviously, the use of closed-loop color control system not only greatly improves the production efficiency technically and reduces the waste of paper, ink and other materials, but also is undoubtedly a great "liberation" for the printing workers, who are more aware of the benefits of the closed-loop system

solve the problem of "eye fatigue"

generally, after working for 8 to 12 hours, the printer operator's sensitivity to color changes will be reduced, and continuous work will inevitably lead to eye fatigue, which will lead to supply guarantee: the color judgment of finished products of conventional products is wrong. Now the machine can undertake this task, and the problem of human eye fatigue is naturally solved

the operator can handle problems other than color.

the closed-loop system will warn the operator when the variable exceeds the acceptable range. Operators know that the system is "dutiful" to maintain the color balance, so they can "free their hands" to check the ink balance, and can focus on folding, tension and other problems, so as to greatly improve the production efficiency

one person operation management

labor saving is a major advantage of closed-loop control over offline systems. The printer of rotary offset press can provide customers with the density variation range diagram of the whole printing process, which indicates a new professional level. This practical document is also valuable when customers express doubts about the printing quality. As the operation of color adjustment after sample signing is reduced, the scanning of sample signing is reduced for offline density measurement. A two frame press can be operated by one operator to manage color and registration

eliminate subjectivity

we know that no two printers look at color in the same way, but the closed-loop color control system is compared with the preset target density to ensure the stability of ink spoon adjustment and color quality, eliminating human subjectivity

different settings for lowering

different levels of operators and different adjustment methods may lead to different adjustment settings in the printing process. What happens after two shifts? A large number of research shows that the difference between printers will increase the variability of production. The closed-loop control system eliminates the problem of "game" between people and color

(to be continued)

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