Lu Lizhe: Discovering 30 Factors Affecting Printing Color
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The first person to discover that gray balance is the determining factor in print quality was Mr. Bruner, who founded the System Brunner to become the most efficient system for automatic ink control on rotary presses. Today, even single-sheet presses can use Bruner's technology, and the efficiency of ink control is leaps and bounds.
Humans have found that you can copy a small gray scale on different resolution materials, and you can copy the whole picture. If you arrange the gray color of the yellow and black colors in the same small point, you can even copy the whole color. image. Printing from manual to automatic, from offset to digital, does not deviate from this principle; the process of continuous improvement and roughness to the exquisite is indeed the result of many dedicated efforts.
Some people have improved the efficiency and quality of printed equipment from the front, while others have turned from the quality management side to improve the quality of printing.
In 1968, Brunner in Winterthur, Canton of Zurich, Switzerland, invented the world's first print quality control strip. A long strip of film was lined up with a solid color block across each ink zone. Let the printing house stick to the large version of the film when printing, and print it together with the printed content. Color blocks and printed content are printed using the same environment, so quality management is based on the color blocks on the control strip, which is simpler and more effective than using the photos of the scenery or characters on the printed matter as the target. This is the earliest measuring strip for offset printing. In 1969, Bruner improved the control strips with toned patches to detect dot gain; later defined the specifications for the different paper properties. For decades, Bruner's test strips have been mentioned in the textbooks of the School of Printing.
Second generation Bruner control strip
In 1975, Mr. Bruner prepared thousands of different prints and provided scores to thousands of printing professionals in Switzerland. He hoped to find out the basic factors of print quality from the eyes of printing experts. Most of them were considered "good." Among the hundreds of prints, Mr. Bruner found that these prints have a common factor, that is, the "grey balance" is very balanced.
This is the first time in the printing industry to discover the impact of gray balance on print quality. Today, the printing industry is paying more and more attention to gray balance, mainly because GRACOL, which was established in 1996, has repeatedly stated that its mission is to help print through communication and education. The industry applies new technologies to improve printing quality, and one of the technologies is the control of “grey balance”.
In 1991, Bruner launched the Instrument Flight online ink control system to read the color information of the printed block from the printing process, using gray balance as the main factor of ink control, timely feedback to the ink control system, and correcting the amount of ink deviation. This is the earliest technology in the printing industry to supervise print quality. In 1998, he started working with the professional QuadTech, a precision mechanical control company, to open a new era of the on-machine ink control system of the printing press. While printing, the color information of the printing block was read in real time on the paper. After the analysis, the ink key correction information was obtained. , passed back to the ink station. Later, QuadTech installed an ink control system for many rotary machines. In order to correct the ink volume in a shorter time, some of the rotary machines read the color information of QuadTech, and the most effective analytical technology capability of Instrument Flight was 6 to 7 seconds. In a short period of time, the amount of ink can be corrected, and the high-speed rotary machine controls the stable quality. The user of Instrument Flight's Gaussian rotary machine thinks that Bruner's analysis can make the printing color of a rotary machine from start to finish. Drop it.
How can Bruner complete the analysis of the color of each ink zone in such a short period of time, and obtain a reasonable correction scale of the ink key?
In fact, there are many variables (factors) that affect the quality of the offset color, not just the concentration of the field, the different tone and the overlay, and the Lab value. In the midtones, grayscales, skin tones, and dot images, the three-tone tones will be felt by the eyes as soon as there is a slight change in the print. Think of any color of the four colors, as long as you add a little more ink, there will be a color shift, which is the change that every printing master will face every day. Only measuring the difference in concentration calculated by the full version of the color block adjustment is still unable to meet the requirements of color stability. More importantly, it is necessary to measure the Lab value of the different tone of the yellow and blue black.
The general infinite loop ink control is only the concentration of the solid color block. If it is too thick, it will drop by one scale. If it is too light, it will rise to a scale. This is not enough to reflect the efficiency of the offset ink volume change, let alone nearly 20,000 impressions per hour. Rotary machine?
Instrument Flight uses solid color blocks (grey balance) to track the full color gamut - paper white to full version contrast, using different tone patches (color balance) to track color shifts, then use Bruner control strips to find There are 30 factors that affect print quality, and cross-analysis quickly finds the value of the ink key correction.
The latest ink control technology, Instrument Flight, has been used successfully in rotary machines because QuadTech helps transfer ink key data to the computer of the control station. If the sheetfed press wants to quickly return the ink control technology, InkZone's technology can help transfer the ink data of Instrument Flight into the various sheetfed presses of various brands.
The CTP installed in the printing house can enjoy the benefits of prepress digitalization. If the benefits of pre-inking are not enough to cope with the competition of printing, Bruna InstrumentFlight, which has the ability to analyze 30 conditions that affect the quality of printing, should be the best. chosen.
Since 2013, Bruner and InkZone have collaborated. Today, sheetfed presses can also be equipped with Instrument Flight to quickly analyze ink control systems.