On the sleeve technology of rotary offset printing

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On the sleeve technology of rotary offset printing

rotary offset printing machine is increasingly favored by people because of its high production efficiency, but it is limited to the field of publishing and printing because of its own weaknesses. For packaging and printing, due to the uncertainty of the size of the packaging box, it is difficult for the rotary offset press to exert its advantages of high production efficiency in the field of packaging and printing

in order to solve this problem, many printing machine manufacturers have adopted plug-in technology. The so-called plug-in technology is to make the plate cylinder, blanket cylinder and embossing cylinder on the printing machine into an independent part, which can be disassembled as needed. In this way, you can pull out the locating pin and then adjust zero; When taking off the extension, according to the needs of the print size, several plug-ins with different drum sizes are made, but this technology is still unsatisfactory. First of all, the cost of making plug-ins is relatively high. If the print size is too large, the cost of plug-ins will be higher. Secondly, the plug-in is relatively heavy, which is laborious and time-consuming to replace. Although it has been improved repeatedly, it is still very cumbersome. In addition, since the rotation of the drum needs to be driven by gears, the economic "single machine working state" caused by foreign technical trade measures cannot be arbitrarily minimized. The residual deformation loss of the steel bar joint can be measured directly, and the diameter of the drum can be designed

the emergence of sleeve technology has made printing of different sizes more flexible, but when replacing the sleeve, the transmission gear must also be replaced, and the change of size cannot be stepless

The emergence and application of shaftless drive technology have greatly changed this situation. After adopting shaftless drive technology in rotary offset press, all shafts are driven by servo motor. In other words, the plate cylinder, blanket cylinder and impression cylinder of the printing machine are driven by independent servo motors respectively. Due to the elimination of the transmission shaft and transmission gear, the shaftless drive offset press can realize the stepless transformation of the size of the printing plate and print different thickness of substrate materials

it can be said that the perfect combination of sleeve technology and shaftless drive technology has changed the situation that the length of rotary offset printing machine is limited in repeated printing, and set off a new revolution in the offset printing market. Delant Gerber company is the first manufacturer to apply the shaftless servo motor technology to the rotary offset press. Its VSOP (offset printing technology with variable sleeve size) concept enables the printing plate and blanket to be installed on the sleeve customized according to the length of the print, with the characteristics of light weight, simple operation, fast replacement, high flexibility, wide range of substrate, etc

at present, in the packaging and label market, the competition of various printing technologies is very fierce. In short version printing, rotary offset printing is superior to gravure printing and flexographic printing. First of all, offset plate making can achieve standing, but it is mostly desirable that the humidification system does not work, and it has excellent performance in addition, gradient, minimum dot size, small lines and text. Secondly, for different types of substrate materials, such as cardboard, labels and films, if gravure or flexographic printing is used, the requirements for plate making are different. However, if offset printing is used, the reproduction curve and printing quality are the same for different printing materials. In addition, when printing on different substrate materials, offset printing also has great advantages in color consistency. Therefore, in the case of less and less printing volume and lower and lower price of today's printing pieces, there will be more markets and opportunities for rotary offset printing. Moreover, with the successful development of new materials such as direct plate making and seamless blanket, rotary offset printing will usher in a broader development space

reprinted from: Printing Technology

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