Development of offset printing institutions viewed

2022-07-29
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Looking at the development of offset printing institutions from the three major offset printing machine brands in Japan

at present, the printing machines of the six major brands have their own characteristics, but in general, the printing quality of German equipment is relatively high, which is generally reflected in high printing pressure, good stability and low maintenance rate. Japanese equipment is far from German equipment, but if the level of operators is high, the printing quality can reach a very high level. Similarly, if the level of operators is low, German machines can not print good products. For the vast majority of prints, there is no significant difference between the two machines

with the popularization and use of JDF process, the printing equipment of major manufacturers have corresponding interfaces. As long as relevant data is transmitted to the printing equipment through the network, all process parameters on the whole printing equipment can be adjusted in place according to the specified requirements, eliminating a lot of manual assistance

Komori

Komori machine is characterized by the use of electric clutch mechanism, while other machines use pneumatic clutch mechanism. The electric clutch mechanism is characterized by simple structure and low failure rate. The disadvantage of the pneumatic clutch pressure mechanism is that the cylinder force is relatively large and easy to leak. This revolutionary technological progress of Komori is also another major progress in clutch technology. The double paper receiving mechanism is another main feature of Komori machine. It can not only solve the problem of replacing the paper receiving table at high speed, but also use this part for waste discharge. This feature is also an important sign that Komori machine is different from other printing machines. It can be seen from these aspects that Komori has invested a lot in R & D. for example, the eccentric upward swing paper transfer mechanism is used to cut into the new field of EPS buffer materials, semiconductor packaging materials and thin honeycomb paper packaging materials, and the speed can reach more than 15000 rpm, while this mechanism is generally considered to be only about 10000 rpm

Akiyama

the greatest feature of Akiyama machine is that the roller opening and closing tooth mechanism adopts conjugate cam mechanism, which is its unique patent. This structure fundamentally eliminates the inertia problem of the open and close tooth spring belt, which is welcomed by new and old users. This structure is simple and reliable. Another feature of Akiyama machine is that the roller adopts 343 structure. The advantage of this structure is that the handover times are greatly reduced, but its disadvantage is that it is difficult to process, it is not easy to ensure the accuracy, and it is troublesome to maintain. Because it reduces the bending and reaction of the paper, it is conducive to thick paper printing. Another feature of Akiyama machine is that the four units can change the version at the same time, which improves the version change speed. In addition, the receiving board can be automatically inserted for convenient operation. Qiushan's double-sided printing equipment is more distinctive. It adopts a combination mechanism in the form of up-down structure, that is, one group of ink on the top, another group of ink on the bottom, and so on. The printing of each group is completed by the direct impression cylinder, that is, the printing quality is the same as that of the single-sided printing equipment. The feature of this structure is that the paper turnover mechanism is removed and the floor space is small, but the height of this machine is higher than that of Mitsubishi double-sided printing machine. Due to these remarkable characteristics of this model, it is likely to replace a small part of the commercial rotation market (mainly because its price is much lower than the commercial rotation)

Mitsubishi

at present, the sales volume of Mitsubishi printing machines in China has risen sharply, which is characterized by convenient operation. The paper delivery mechanism of Mitsubishi machine adopts high point tooth closing mechanism, so its speed can reach more than 17000 rpm. Its mechanism design is unique and one of its patents. The roller adopts taper bearing to facilitate installation and commissioning. To maintain high precision, the key depends on the quality of the bearing and the technical level during installation and commissioning. The presser foot structure also does not have air blowing. In addition, the Feida part adopts four paper separation suction nozzles and four paper feeding suction nozzles, which has good adaptability to paper. The double-sided printing equipment developed by Mitsubishi machine has a unique structure, with the front four groups of ink on the top and the back four groups of ink on the bottom, so the paper does not need to be turned over in the printing process. In addition, drying and other devices can be installed in the middle of the utility model. The biggest advantage of this structure is that it eliminates the turnover mechanism. The biggest disadvantage is that the machine occupies too much land and is not as convenient to use as the equipment of other manufacturers (the equipment of other manufacturers can be used for five colors or 4+1). It has strong adaptability and is free of adjustment (no adjustment below 250g/m2). A damping mechanism is installed inside the drum. Printing fine movable parts has high requirements for operators who have built relevant public R & D platforms and scientific and technological support platforms. Maintenance is quite troublesome

at present, the development trend of the printing press is mainly focused on the following aspects: first, the increase of speed. It is expected that the speed of the printing press will gradually increase to about 20000 rpm, and the highest speed may reach 25000rpm, which is becoming more and more important in the field of energy-saving materials. Second, multi-function is increasingly reflected, especially the integration of post press and printing equipment is a development trend, which is particularly prominent from the drupa exhibition last year. The third is the automatic tracking detection system, which mainly detects the ink volume, water volume, print quality and other related technical indicators, so as to lay the foundation for the full-automatic control of the printing machine

information source: keyin

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