It was Mr. Bruner who first discovered gray balance as the determinant of printing quality. He founded System Brunner, which became the most efficient system for automatic ink control on rotary presses. Today even sheet-fed printing presses can use Bruner's technology, and the efficiency of ink control is advancing by leaps and bounds.
Humans have found that it is possible to copy a gray scale of a small point on materials of different resolutions, and then it is possible to copy the entire picture; if the gray scales of yellow magenta, blue and black are arranged in the same small point, even the whole color can be copied image. Printing does not deviate from this principle from manual to automatic, from offset printing to digital; the continuous improvement of the process from rough to beautiful is indeed the result of the efforts of many interested people.
Some people improve the efficiency and quality of printing equipment from the front, while others turn back from the quality management side to improve the quality of printing.
In 1968, Brunner in the Swiss city of Zurich, Switzerland, invented the world's first printing quality measurement and control strip. A long film lined with solid color blocks across each ink area So that the printing factory can stick it on the large-scale film when printing, and print it together with the printed content. Color blocks and printed content are printed in the same environment, so quality management is based on the color blocks on the measurement and control strip, which is simpler and more effective than using the pictures of landscapes or people on the printed matter as the target. This is the earliest measurement and control strip for offset printing. In 1969, Bruner improved the measurement and control strip and added color patches to detect dot expansion; later, the specifications of color patches were defined for different paper characteristics. For decades, Bruner's measurement and control strips have been mentioned in the textbooks of the College of Printing.
The 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 printing quality from the perspective of printing experts. Among the hundreds of prints, Mr. Bruner found that these prints have a common factor, that is, the "gray balance" is very balanced.
This is the first time the printing industry discovered the impact of gray balance on printing 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 task is to help printing through communication and education. Industrial application of new technologies to improve printing quality, one of which is the control of "grey balance".
In 1991, Bruner launched the Instrument Flight online ink control system. It reads the color information of the color blocks on the printed sheet from the printing process, and uses gray balance as the main factor of ink control. It feeds back to the ink control system in time to correct the deviation of the ink amount. This is the earliest technology for printing quality monitoring in the printing industry. In 1998, he began to cooperate with QuadTech, a professional in precision machinery control, to start a new era of "on-board ink control system" for printing machines. While printing, the color information of the color blocks on the printed sheet was read in real time on the paper path, and the ink key was corrected after analysis , Pass back to the control ink table. Later, QuadTech installed an ink control system for many rotary machines. In order to correct the ink volume in a shorter period of time, some rotary machines used the most effective analysis technology capabilities of Instrument Flight to analyze the color information read by QuadTech in 6 to 7 seconds. In a short period of time, the amount of ink can be corrected to control the stable quality of the high-speed rotary machine. Gauss rotary machine users who use Instrument Flight believe that Bruner ’s analysis can allow a rotary machine to print colors from start to finish without running. Off.
How can Bruner complete the analysis of the color of each ink area in such a short time, and find a reasonable correction scale for the ink key?
In fact, there are many variables (factors) that affect the quality of offset printing target color, not just the density and Lab value of field, different tone and overprint. As long as there is a slight change in the printing of the three-color tones in the midtone, grayscale, skin tone and halftone images, it will be immediately felt by the eyes. Think about any of the four colors, as long as you add a little more ink, there will be a color shift, which is a change that every printing master will face every day. Only measuring the density difference calculated by the adjustment of the full color patch still cannot meet the requirements of color stability. More importantly, it is necessary to measure the Lab value of yellow magenta cyan black in different tones that are printed separately or overlaid.
The general dead-cycle ink control is only to compare the density of the color patch on the ground. If it is too thick, it will decrease by one scale, and if it is too light, it will increase by one scale. The carousel?
Instrument Flight uses solid color patches (gray balance) to track the full color gamut-from paper white to full version, uses different color patches (color balance) to track color shifts, and then uses the Bruner measurement and control strip to find There are 30 kinds of factors that affect the printing quality, and the cross analysis quickly finds the value of the ink key correction.
Instrument Flight, the latest ink control technology, has been successfully applied to the rotary machine, because QuadTech helps to transfer the ink key data to the computer of the ink control station. If the sheet-fed printing press wants fast-feedback ink control technology, InkZone's technology can help transfer Instrument Flight's ink-control data to sheet-fed printing presses of various brands.
If CTP is installed in the printing house, you can enjoy the benefits of pre-press digitization. If the benefit of pre-discharging is not enough to meet the competition of printing, Bruner InstrumentFlight with the ability to analyze the 30 conditions that affect the quality of printing should be the best chosen.
Since 2013, Bruner has cooperated with InkZone. Today, sheetfed presses can also be equipped with Instrument Flight quick analysis ink control systems.
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