Screening two sounds from web printing

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Add: two kinds of sounds from the web printing field

for rotary printing, with the use of non-traditional adding technology, the problem of ink piling often occurs. Mr. John Lind, director of pia/gatf's research office, reminded us that "the successful use of the new processing technology depends on the appropriate ink, paper, rubber lining, and the arrangement and setting of the printing rollers. The ink stacking often occurs in the high light areas, where a lot of fountain solution is adhered. If you don't stop frequently for cleaning, the rubber 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 also manually adjusted. Sometimes, the experimental space will be reflected to the ink manufacturer. Don sierzega, the production manager of Sun Chemical Company, received a lot of feedback from customers. He said: "on the one hand, the ink stacking problem is caused by too small points. On the other hand, the ink film used in the random addition process itself is very thin and there is less fountain solution. As a result, the printers have no more room or choice to adjust on the printing machine."

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 don't specialize in producing ink for random printing, but we know what kind of ink is suitable for and what isn't, and 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 to FM, some companies need to create different point increase compensation curves and use inks with different viscosity values

Gary Samuels, a shareholder of pictorial offset offset offset company, told us: "our printers prefer to use frequency modulation in sheet fed printing than web printing. Sheet fed printing has high transmission accuracy, short interval and small color change when preparing for printing. The registration accuracy is easy to guarantee 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: "when using the staccato technology of Cleo on the rotary printing press, the printing plate durability is reduced, thus increasing our plate consumption. We found that the frequency modulation plus technology is not suitable for the printing of high-speed rotary printing 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, which also produce fine details and bright pictures for us. We print some furniture leaflets. It is very important for our customers that the printing materials are bright in color and the pictures are clean and tidy. We won't have any problems about moire stripes here, and the registration effect can be guaranteed, which is very important for wide web printing."

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 plug their ears. "

Fuji 4 With the co res addition technology with adjustable range, Mr. Jeff Hernandez, vice president of the company, summed up a secret - keep it simple, He said: "I think random addition has its value, but what I need is the advantage that I can maintain 95% of the time without downtime, compete with random addition, and do not need to make too much changes. If you want to adopt 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 the printing enterprises use the conventional process control method and the printing machines are in normal working conditions, they can adopt random addition technology. Many of our customers directly apply the new addition technology without making any changes. If you look at the yellow pages, you will see that 80% of the factories in North America are printed by random addition. Wal Mart And most of the posters and leaflets of Home Depot home sales company. 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 adopt 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 additive. Using the random additive technology on the printer, 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 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 extraordinary results."

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