Analysis of the application prospect of the hottes

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Analysis of the application prospect of rotary offset printing in label printing (I)

label printing in label printing, the reciprocating paper feeding semi rotary and full rotary offset printing equipment is a new type of printing method, which is mostly used in combination printing, and also suitable for separate printing and processing of medium and short (long) versions. At the Labelexpo Asia 2007 held in Shanghai, the TR2 self-adhesive label offset printing machine of Iwasaki company, which was represented by Beijing Baochi Technology Development Co., Ltd., was the only offset printing reciprocating paper feeding rotary offset printing machine at the exhibition, which attracted the strong attention of visitors. Some domestic mechanical equipment manufacturers have also begun to develop self-adhesive label web offset printing machines, such as the zx-320 intermittent PS version trademark printing machine produced by Ruian Donghai Printing Machinery Co., Ltd. has achieved good market effect, while Zhongtian Printing Machinery Co., Ltd. and Shanxi Tianze Taihang Machinery Manufacturing Co., Ltd. also exhibited rotary offset printing equipment at the 2009 South China Printing Exhibition, Beiren Fuji Printing Machinery Co., Ltd. will exhibit the latest rotary offset press at China print 2009

among the printing methods used in label printing at present, various printing methods such as offset printing, gravure printing, flexo printing and silk screen printing are applied. Rotary offset printing is a new force to enter the label printing market. It provides a new printing method for label printing processors and their customers. Different from flexo printing, it can provide higher quality

advantages comparison between offset printing and flexographic printing

offset printing and flexographic printing can also be used in label production, but the specific methods are different. Although flexographic printing is more commonly used in narrow width printers, offset printing has its own advantages and disadvantages

the ink transfer system of offset printing is complex, and a long ink path is composed of multiple ink rollers. Offset printing plate is a positive picture, while flexo printing is a negative picture. Offset printing is a widely used printing technology, which transfers the inked image to the blanket first, and then to the surface of printing materials

the inks used in the two printing methods are also different. Davepancoast, sales manager of labeloneconnect in the United States, explained that the viscosity of ink used in flexo printing is similar to that of milk. The printing plate is made of nylon or plastic, and the ink on the printing plate is directly transferred to the film base or paper substrate. Offset printing inks are mushy, heavy and strong in coloring. The ink is first transferred to the printing plate, and then transferred to the substrate through the blanket. The ink transfer system is relatively complex

Le, general manager of rotatek in Spain, pointed out other differences. He said that the maximum printing accuracy of flexo printing is 170 ~ 180dpi, while rotary offset printing can reach 200 ~ 300dpi, and the printing method is simpler and more economical than flexo printing. Jeschilfling, general manager of etipol company in Denmark, pointed out that offset printing must be adopted and will be favored by more and more businesses. UV drying can be used for flexo printing, and hot air drying can also be used for UV drying

the printing quality of offset printing should be superior to that of flexo printing, which is often mentioned as the advantage of offset printing. Soler explained that offset printing has more dots per inch and more uniform optical density than flexo printing. Paul mattle, marketing manager of Swiss Gerais company, said: the reproduction range of flexo printing points is generally between 3% and 98%, while the reproduction range of offset printing points can reach 0 ~ 100%. Gerbenvan Wijk, manager of the public relations department of Drent Goebel company in Canada, said: one of the biggest advantages of offset printing is that the cost of offset printing is much lower than that of flexo printing and gravure cylinder in terms of the start-up cost of new moving parts. At the same time, the production time of offset printing plate is much shorter than flexo printing, which takes only 10 minutes on average. This means that you can start printing new live parts soon

easy operation is another advantage. Jakob Landberg, marketing manager of nubotai company in Denmark, explained that even a careless printer can print excellent quality on the offset press, but in flexography and UV flexography, we must be careful and try our best. Not only that, offset printing has high stability, which is more suitable for printing live parts with large printing volume and long cycle

Jon guy, chairman of Swiss Gerais, also agreed that offset printing has good consistency in color restoration. He said: the biggest advantage of offset printing is that it is the only printing method with general standards in the world, and the same color effect can be achieved according to the standard formula

challenges faced by offset printing

no printing method is perfect, and rotary offset printing is no exception. As van Wijk said: the current challenge is how to master this printing technology. Offset printing is different from flexo printing. It will be difficult to learn, but after good training, there is no application problem. The stable value of Soler difference within ± 2 says that flexo printing can be applied to non absorbent materials such as film or self-adhesive, which is a challenge for offset printing. At the same time, in the face of wide substrate, offset printing can only flinch

Christoph Schoenenberger, process director of Gerais, said: we found that offset printing has the following shortcomings: high technical requirements for printing workers; Because the structural design of offset press is complex, the investment of equipment is high; More waste; Boot preparation time is longer than flexo printing

Hilfling said: generally, the printing size of rotary offset printing is fixed. Although it can be solved by using a web offset printing machine with variable printing size, the cost is relatively expensive

watery offset vs waterless offset

at present, there are two kinds of offset printing, one is watery offset, the other is waterless offset. In the process of water offset printing, water is transferred from the fountain roller to the printing plate. Due to the existence of water, the ink cannot adhere to the blank part of the printing plate. The anhydrous offset printing does not need the existence of water in the printing process. It uses a special plate. After the plate is made, the blank part does not absorb ink. There is no ink balance problem in waterless offset printing. This project is invested and constructed by Tangshan Zhonghao Chemical Co., Ltd., so it is easier to control hue and dot increase than that of waterless offset printing machine

Hilfling said: when printing a new movable part, water offset printing often needs to waste a lot of materials to solve the problem of water ink balance, while water free offset printing and flexo printing do not need to be so complex. Kyle knight, the operation manager of ccllabel, believes that waterless offset printing is similar to letterpress printing and has strict requirements on the temperature and humidity of the working environment

statement: the result caused a serious problem affecting the construction quality - leakage

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