Review on the development trend of printing machin

Review on the development trend of printing machinery in the 1990s back

since the 1990s, marked by the fact that sheet fed experimental machines require great efforts to complete offset presses, the design and manufacturing level of printing machinery in the world has taken a big step forward. Heidelberg company, Roland company, gaobao company in Germany, Komori company and Mitsubishi company in Japan have all launched their new generation of representative models. Compared with the previous generation models entering the market, the new generation models have the following characteristics:

1 The speed has been further improved. The machine speed of the original model is generally 10000 prints, and the new model can reach 15000 prints

2. The preset time before printing is greatly shortened. The preset time for replacing live parts of the original model is generally about 2 hours, while the shortest preset time for the new model under full-automatic control is reduced to 15 minutes

3. Due to the improvement of the running speed of the machine and the shortening of the pre press preset time that limits the production efficiency of the machine, the actual productivity of the machine is greatly improved. The practice of relevant printing plants shows that the production efficiency of the new model is twice that of the old model, which was delivered only five or six years ago

4. The degree of automation has been greatly improved. The automatic control of the old model mainly focuses on the automatic adjustment of ink color and registration system, while the new model realizes the full automation of the whole printing operation and operating system from paper handling to the end of printing. Some people say that the printing press has entered the era of "fool machine". In this regard, people know more about the automatic control system of printing machine is the CPC of Heidelberg company plus CP tronic system and the pecom system of Roland company. The improvement of machine speed, the reduction of prepress preset time of live parts and the corresponding improvement of printing machine production efficiency are inseparable from the improvement of automatic control

5. The high precision of mechanical structure and mechanical system is suitable for high speed and high automation. People often only pay attention to the role of electronic, optical and computer control systems in promoting machine speed and improving machine efficiency. In fact, the improvement of design level and manufacturing accuracy of mechanical structure and mechanical system also plays a decisive role. The new generation of printing machines adopt more mechatronics systems with simple mechanical structure and high precision, and their mechanical systems continue to develop in the direction of simplified structure, high precision, optical, electrical, hydraulic, pneumatic and computer automatic control

6. In order to ensure the good printing quality and high reliability of the printing machine under high-speed operation, the new generation of printing machine has made a great breakthrough in design theory and design concept. This is mainly reflected in the overall layout of the printing press, the design of paper feeding system, ink and water feeding system, transmission system, registration adjustment system and other auxiliary devices. Due to the advent and successful operation of a new generation of models, the equipment produced five or six years ago soon became outdated. At that time, the printing enterprises that had just purchased the older generation of models had felt that these devices could not adapt to the fierce market competition. Facing this reality, printing enterprises that have purchased and are planning to purchase a new generation of equipment are also considering the next step, that is, how long can the current new generation of equipment be popular? They worry that the new generation of equipment will soon be replaced by newer and more superior models? In other words, will more efficient printing machines appear in the market in the next few years? Such concern cannot be said to be unreasonable in today's rapid development of science and technology. The main competitive advantages of the new generation of sheet fed offset press lie in two aspects: the actual running speed and the pre press finishing time. First, let's see if the speed of the single sheet offset press will be further increased to 18000 or 20000 prints per hour. According to the analysis of relevant people, it is possible to further improve the speed, but doing so will greatly increase the cost of the machine, without giving the machine a greater advantage. At this time, the printing factory will consider using web printing machine. As for the pre press pre adjustment preparation time, it has reached a relatively low level of about 20 minutes. Even if it is shortened by 50%, it will only take 10 minutes. For a print that needs to be printed for two hours, or compared with shortening the original two hours of prepress preparation time to 20 minutes, saving another ten minutes is irrelevant. In terms of printing quality, the new generation of printing machines will not be more challenged. Waterless printing has higher printing quality, but it has not yet reached the stage of popularization. Waterless printing has higher printing quality, but it has not yet reached the stage of popularization. Using waterless printing only needs to replace the ink transmission and water transmission system of the printing machine, while the new printing machine has the ability to use waterless printing ink transmission system. Therefore, it can be said that the sheet fed offset paper printing machine has the ability to use the waterless printing inking system. Therefore, it can be said that sheet fed offset printing has entered a relatively stable and consolidated stage. Printing enterprises need not worry that the current popular models will soon become obsolete. However, is there a new printing method that can surpass sheet fed offset printing? This is also a problem that people are considering. People first think of digital printing. The digital printing industry may pose a certain threat to some printing methods. For example, digital electronic transmission has taken the agency to print large quantities of forms, which makes form printing shrink rapidly. However, the short version fast digital printing machine represented by xeikons and indigos has not yet become the competitive object of sheet fed offset printing machine, at best, it is only a supplementary means of sheet fed offset printing machine. Promotion of digital printing machine digital printing can undertake a few copies or even a live piece of a product, but such copies are rare. On the contrary, web offset printing may pose a threat to sheet fed offset printing. However, from the perspective of printing batch and cost, there is no web offset machine model that can occupy the site of sheet fed offset printing in the future. The computer to press technology represented by the Heidelberg company quickmaster Di printing machine is actually the application of digital plate making technology in offset lithography. It is characterized by the use of computers to control laser direct scanning plate making on the printing machine, complete the format correction in the form of waterless offset printing, and short version fast color printing. At present, the printing quality is slightly inferior to the traditional offset printing technology. In terms of printing batch and cost, it can be used as a supplementary model of offset press. As for the electronic and computer control technology of printing equipment, the pecom printing machine control system of Roland company has its own characteristics, which combines printing machine control, production organization and production management. Its electronic equipment control cabinet adopts double-layer side arrangement of the unit. The first layer outside the wall panel of Meihe unit is the electronic control device, and the inner layer is the mechanical device and the corresponding lubrication system. This arrangement is not only more convenient for the maintenance and pre maintenance of the printing machine, but also eliminates the uneven and prominent handle on the outside of the machine. If there is a problem with the circuit board of a certain unit when the experimental machine is doing the experiment, you can take the corresponding circuit board of another unit for maintenance or troubleshooting. Pec7 is equipped with a micro printer and RS232 general data interface. The OM control system operates in a language that is easy for the operator to read. The data display is expressed in different colors according to the nature of the monitored object: blue is an optional item, green, yellow and red respectively indicate the importance or urgency of the item, and it rarely adopts the way of symbol representation. The system adopts the drive software that can always be upgraded, so as to ensure that the new generation of offset press will not fall behind as quickly as before. However, overemphasis on comprehensive electronic and computer control will also have adverse factors. Because every additional control, such as UV drying, powder spraying, automatic version, automatic cleaning, etc., will occupy the system space. If the user does not purchase some auxiliary equipment, its control point will be idle at the roadside, and the user will pay more than the purchase cost for nothing. Therefore, some printing machines choose various design methods to avoid the emergence of huge electronic and computer control devices. In the overall layout of the machine, the new machine has more application of ergonomic design principles. In the past, it focused on the compact structure, the area of the station and the design concept, but shifted to emphasizing human factors and coordinating human-machine relations, and paid more attention to the safe and comfortable working environment, convenient operation and low labor intensity. Roland company abandons its long-standing arrangement of two-color units without rollers on the new Roland 700 machine and adopts the arrangement of three roller monochrome units with high flexibility. The drum diameter of some companies' new folio printing machines has been restored from mm of the original model to 300mm used in the early stage, which is by no means a simple dimensional change and rigid requirements. It reflects the choice of the above new design concepts and is more conducive to improving the stamping quality; In order to make the printing machine more adaptable to paper, the double Beijing duck printing cylinder is a common choice for printing manufacturers; The rolling and "seven o'clock" arrangement of the printing device was first adopted by Heidelberg company. Now the new movement produced by other companies, including Roland company and gaobao company, also adopts a similar arrangement, so as to ensure that the paper handover can be carried out after the stamping is completed. Roland abandoned the roller paper transfer method established by the printing machine of Li zhuantong, And actually developed a new "one word type" "Paper conveyor. The biggest advantage of this paper conveyor is that it uses any adjustable air flow control, so that the paper does not need to contact any parts in the process of re transmission. There is also an unexpected gain from this, which makes it easy to directly install UV drying devices between the units. When the sheet fed offset press is at the speed level of 10000 printing per hour, different models of various companies use paper delivery mechanisms with different design principles, which enter the Heidelberg company's rotating drum delivery Paper teeth, rotary eccentric swing paper teeth of Roland company, friction wheel of Miller Company and pneumatic paper feeding transcendental paper delivery mechanism of hailis company, etc. When the new generation of 15000 printing per hour model is introduced to the market, the centering pendulum paper delivery teeth seem to be the common choice of different manufacturers, which just gives play to the advantages of the pendulum paper delivery mechanism suitable for high-speed, large format and high positioning and transmission accuracy. The trough wheel intermittent paper delivery mechanism of gaobao company has the highest paper delivery speed among the various address mechanisms of the original generation of models, up to 15000 sheets per hour. Now, the company's new (rapida105) also adopts the downward swing paper delivery mechanism. For many years, a research goal in the manufacturing of web offset press is to eliminate the long rotating shaft between the units, that is, the so-called "no coaxial transmission technology". Interestingly, Roland company installed a long drive shaft with universal adjustment function between its new model (ROLAND700) units to balance the load of transmission parts of each unit, improve transmission accuracy and reduce transmission error. Of course, this phenomenon can not be understood as "seeing that mountain high from this mountain"

the development trend of web offset press today is still to improve the degree of automation, speed and simplify the structure. For machine manufacturing companies, the ultimate goal is to meet the actual needs of printing enterprises. Due to the changes in the print market, the demand of printing enterprises for small and giant web printing machines has increased. High end commercial printing enterprises pursue higher printing quality, folding flexibility and shorter printing preparation time. They hope that the web printing machine has the functions of automatic version change, negative rotation and automatic folding format change. publish