Screening comes from two kinds of sound in web pri

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Plus: two voices from the web printing field

plus web printing

for rotary printing, with the use of non-traditional addition technology, ink piling often occurs. Mr. John Lind, director of pia/gatf's research office, reminded us that the successful use of new processing technology depends on the appropriate ink, paper, rubber lining, and the arrangement and setting of printing rollers. Ink piling often occurs in high light areas where a lot of fountain solution is adhered. If you don't shut down frequently for cleaning, the blanket will be damaged

a seminar sponsored by M-real paper was held in Stuttgart, Germany. Nine rotary printing manufacturers came together to discuss various problems in random printing. The meeting reached an astonishing conclusion: all members refused to use the random addition technique

the most common complaints of these printing companies are point enlargement, compensation curve and various complex adjustments in the printing process. They believe that the use of FM plus will make the ink film thinner, resulting in more serious soiling on the blanket, which means frequent downtime to clean the blanket

in order to get a full reproduction effect in the dark areas, it often causes serious ink accumulation on the blanket. The printing operator usually does not pay attention to this problem because it is not obvious on the printing sheet. Therefore, the ink will form an ink skin on the blanket, which has left tiny cracks when cleaning the blanket. Soon the cracks in the blanket will get bigger until the blanket is replaced

these problems are sometimes reported to ink manufacturers. Don sierzega, the production manager of Sun Chemical Company, has received many complaints from customers. He believes that the ink stacking problem is caused by too small points on the one hand, and the random addition process itself uses very thin ink film and less fountain solution on the other hand. As a result, the printer has no more room or choice to adjust on the printer

sierzega suggests that in case of such problems, either replace the ink or reduce the concentration of the fountain solution, so that the operator can use more fountain solution to reduce the occurrence of ink stacking problems

Andrew Matthews, technical director of thermosetting ink production of flint ink company, has also received similar technical consultation. He said: we do not specialize in producing ink for random printing, but we know what kind of ink is suitable for what kind of ink is not suitable. Hard ink is not suitable for random printing, because the ink on the random printing plate is so thin that water will wash the ink, resulting in ink imbalance. The ink with good applicability has strong water repellency

when changing from am plus technology to FM plus technology, some companies need to create different point increase compensation curves. Vestolit manufactures PVC paste resin for floor, wallpaper and automobile chassis protection, and also uses inks with different viscosity values

Gary Samuels, a shareholder of pictorial offset offset offset, told us that our printers prefer to use FM in sheet fed printing rather than web printing. The preparation time of sheet fed printing is short and the color change is small. The registration accuracy is easy to ensure and it is difficult to see the visible dot pattern. For sheet fed printing, especially for the printing of people's faces, we can print the skin color effect of fine tone, high light and dark tone and smooth transition. This is not an easy thing for web printing. Our staff don't like FM. Because there will be ink stacking failure on the web press

the use of FM plus will reduce the service life of the printing plate. Samuels explained that when we use Cleo's staccato technology on the rotary press, the printing plate durability decreases, thus increasing our plate consumption. We found that the frequency modulation plus technology is not suitable for the printing of high-speed rotary printing lines in terms of the current technical level. If the number of lines is higher than 200 LPI, I think there will be problems

but in Grandville printing, the situation is different. The company has used the staccato plus technology of Cleo for one year. Estes told us that it is very smooth to use this technology. He said: we have some old rotary printing equipment. These equipment also produce fine details and bright pictures for us. We print some furniture leaflets. For our customers, it is very important that the printing materials are bright in color and the pictures are clean and tidy. There will be no problem about moire fringes here, and the registration effect can be guaranteed, which is very important for wide web printing. Chinese people have always expected to develop a conductor that can utilize aluminum resources

suffoletto, a researcher at RIT school, believes that the best reason for people to accept new technologies is that they are easy to use. Printing companies want plug and play so convenient that they don't want to do any expensive and time-consuming improvement, research and testing. They really do not want to change the existing raw materials or supply channels. Therefore, when the manufacturers say that they must replace the fountain solution, blanket or ink, they want to block their ears

the classic color company located in Broadview, IL region adopts Fuji's co res addition technology with more scientific linear temperature rise and fall speed (average speed per 5 min). Mr. Jeff Hernandez, vice president of the company, summed up a secret to keep it simple. He said: I think random addition has its value, but what I need is that I can keep 95% of the time without stopping It can compete with random addition and has the advantage of not having to make too much change. If you want to use random addition technology, you will mess up your prepress and printing departments

Pritchard of Kodak/Cleo believes that using FM plus technology does not require additional process control. He said: if printing enterprises use the conventional process control method and the printing machine is in normal working state, they can use the random plus technology. Many of our customers have directly applied the new processing technology without any change. If you look through the yellow pages, you will see that 80% of the factories in North America are printed with random processing, as are most of the posters and leaflets of Wal Mart and home depot. When printing this kind of printing, the printing machine needs very little control of the printing process. If any sheet fed printing plant wants to complete a good job, it will pay more in process control than companies using FM plus technology. I don't think it is difficult to use FM plus technology

gary Samuels of pictorial said; The printer cannot change the color during the printing process, and you may have% chance to change the color compared with the traditional printer. Using the random addition technology on the printing press, we can increase the ink density to 20% without any change

Troy mone, prepress manager of merit printing company, also said: we have conducted some printing tests and found that it is difficult to grasp the point when using the linear random addition technology. On the contrary, the hybrid addition technology combining am and FM addition and the spekta addition technology of screen company can show remarkable results


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