1. Four-color offset printing machine has gradually become the darling of the market
The domestic offset presses exhibited in previous exhibitions were mainly single-color and double-color, and the four-color offset press market has been controlled by foreign manufacturers. Almost all exhibitors of the offset presses at the All-India Exhibition launched four-color offset presses, ranging from eight-to-four-color to four-to-four-color, folio four-color and full-sheet four-color. The proportion of traditional single- and two-color offset printing machines on display has greatly reduced the expectations of users for four-color machines, which are much higher than those for single- and two-color machines. According to the manufacturer's report, the orders for the four-color machines of each manufacturer are almost arranged to three months later, and some have even been arranged to the end of the year. The great popularity of the four-color machine is related to the market cultivation over the years. In the past few decades, China's printing press market has been dominated by single-color and double-color machines. Many printing houses have purchased single-color and double-color machines at the beginning. They have already had a certain amount of capital through years of accumulation, which has just reached the strength of purchasing domestic four-color machines This is also the main reason why the domestic four-color machine market is optimistic.
Second, the performance of the machine has steadily improved
Nowadays, the era of stop-and-go performance for domestic printing presses that can perform live printing performances is over. Accurate overprinting is no longer a major problem at the prescribed speed. The overprint error of the proofs displayed on site can be controlled within 0.05mm, and the speed of the machine can reach more than 10,000 rpm. The quality of field printing and flat screen printing has also been significantly improved. The obvious noise reduction of the machine can basically meet the requirements of the standard. Especially commendable is that the speed of roll paper printing machine introduced by Beiren has reached 75,000 sheets / hour and has reached the advanced level of similar foreign products.
3. The machine structure design is getting closer to the international level
In addition to the original accumulated technology, the equipment design of many domestic manufacturers exhibited in the All-India Exhibition fully absorbed advanced foreign technology and added a lot of independent innovation technologies to significantly improve the level of machine structural design. Down swing type front gauge, paper-passing mechanism double-diameter imprinting and paper transfer cylinder, pneumatic control (clutch pressure, ink and ink interlocking mechanism, etc.) pneumatic conveying paper board, conjugate cam drive mechanism with spring-loaded gripper mechanism alcohol wetting, Automatic or semi-automatic plate-feeding mechanisms have basically become the mainstream structure of modern printing presses.
Fourth, the degree of automation is gradually improving
The degree of automation of domestic printing presses has been greatly improved. Taking the offset press produced by Yingkou Guanhua as an example, its eight-open four-color offset press is equipped with a CPC ink supply device, which can directly control the amount of ink of each color group through the operation console. This is the first time that offset press manufacturers have adopted this mechanism. The latest production of an eight-open four-color offset press is also equipped with a fully enclosed ink volume adjustment device, and the size of each ink fountain gap can be automatically adjusted by scanning the signal bar on the sample sheet through the scanning head. Liquid crystal display touch screen control has been promoted and used in printing equipment. The automatic version of the electric killer L has gradually become the standard configuration of the printing press, and its level has been close to the advanced level of similar foreign products.
Fifth, the design quality has been significantly improved
The appearance quality of all the equipment at the All-India Exhibition has been significantly improved. Silly, big and stupid products have been rarely seen. Some equipment is even difficult to distinguish at home from domestic or foreign production. The appearance, color and ergonomic design are more thoughtful than before.
The manufacturer's equipment level gradually improves the precision of printing machine parts manufacturing. In addition to being related to the level of the operator, the key is to have high-precision equipment. It is understood that almost every manufacturer has more than 1 to 2 machining centers, and some manufacturers have pentahedral machining centers. CNC machining equipment has become the mainstream equipment for parts processing. Some manufacturers have introduced high-precision grinders, and the accuracy of their gears can reach more than 4 levels (the largest gear can be processed with a diameter of more than 1m). This is an order of magnitude higher than the previous equipment. It has reached the advanced level of similar international product processing. The bisector error of the axis of the gripper axis of the cylinder above the double diameter can be controlled below 0.02mm, which can fully guarantee the requirements of the drum paper transfer.
In addition to the design quality, product quality is also closely related to the mechanism and process. If you often find that the same batch of machines are running in good condition, others are in poor condition. Sometimes the method adopted by the factory is to disassemble and reassemble. As a result, the quality after reassembly is different from the original. The reason for this phenomenon is often difficult to clarify, and the result is usually not clear. The next time you encounter the same problem, you still need to use this method to solve it. By exchanging ideas with many peers, it is a process issue. There are many parts on the printing machine. If one component fails, it may lead to the failure of other components in the working state. Eventually, the whole machine will fail. As some manufacturers have said, many of our component standards are not strict enough, and many of the components we consider to be qualified products. Most failed by foreign standards. Therefore, to ensure the consistency of the product, the processing accuracy of key components must be further improved. In addition to the necessary assembly tooling during installation. There must also be special inspection tooling to speak with data. [next]
Sixth, high-speed dynamic performance testing is imperative
At present, the accuracy testing we do is basically dynamic testing performed under static conditions, except for noise, which is judged by visual inspection or feeling. Especially when the machine is working normally at a certain speed, it is difficult to find its internal cause. Most foreign advanced printing equipment manufacturers have cooperated with scientific research institutes to carry out dynamic testing. For example, the printing equipment of a German manufacturer has done the modal analysis of the whole machine, and the modal analysis has been used to further improve the design of the weak links on the machine, reducing or reducing the possibility of causing failures. A Japanese manufacturer used a high-speed dynamic design of the drum to absorb the vibration generated at high speed using a vibration absorber. As the speed of the machine increases, it is imperative for the printing press to adopt dynamic design techniques.
Seven, automatic version
The cable-pull version technology also needs to be actively promoted. Some domestic manufacturers have adopted automatic or semi-automatic versioning. But most manufacturers still rely on manual version. Although equipped with electronic punching device. But production efficiency is not very high. The slant-pull cylinder technology (there is also a slant-pull transfer cylinder technology) is used even less, and only a few manufacturers master this technology. To compete with foreign equipment. The oblique-drawing platen technology must be adopted, which is already the standard configuration of foreign equipment. From our national conditions. It is better to use a semi-automatic version. Full-automatic versioning is of little significance. In this way, it is possible to achieve a fast version. It can also minimize production costs. Speaking from the perspective of the diagonal cylinder. Generally, the slant amount is about 0.2mm. Too large is meaningless (mainly because the accuracy of current electronic punching can be controlled within 002 ~ 0.03mm. In most cases, after the printing plate is installed, it can be aligned with the rules by simple adjustment). The machine will generate a small amount of vibration after pulling the roller diagonally. Excessive amount of diagonal pull will have a serious impact on print quality. So now there is also the use of slanted version technology. That is, the position of the printing plate on the cylinder is automatically adjusted. It is not necessary to use this technology on single and double color machines. The use of this technology on machines with more than four colors will significantly improve production efficiency. Many users report that after adopting this technology, they can basically align the rules within 20 minutes. It takes at least half an hour to find a rule without using this technology. It usually takes more than an hour. The high precision of overprinting sometimes requires more than two hours. Now the printing cost is relatively low. Reducing costs by improving efficiency has become a strong demand of users.
Eight, comprehensive use of mechatronics technology
Mechatronic technology replaces the traditional mechanical transmission chain, and pneumatic technology is generally adopted on the machine. Such as pneumatic clutch pressure, pneumatic ink-water clutch, pneumatic interlock mechanism, etc. However, the degree of adoption of electronic control technology is not high enough. Only very few machines use CPC ink supply system technology. The independent transmission technology of ink fountain roller (driven by a separate motor) is adopted on individual machines. Shaftless Feida control technology and high-speed online detection technology are basically not adopted in domestic equipment.
9. Further research and development of high-speed paper feeder
A key reason restricting the development of printing presses in China is that there is still a gap between paper feeder technology and similar products abroad. At present, the paper feeder market within 10300 rpm has been fully occupied by domestic paper feeder manufacturers.
However, paper feeders with more than 15,000 rpm are mainly dependent on imports. As the speed of the printing press increases. 15000 rpm has become a standard speed recognized by the industry. Therefore, we must go all out to research and develop high-speed paper feeders to meet the needs of market development. The technical backwardness of the high-speed paper feeder is mainly manifested in Feida's stability design, the dynamic stability design of the speed change mechanism, and the design of the vacuum conveying cardboard. Now these technologies have made breakthroughs to varying degrees. But compared with similar foreign products, there is still a distance.
Research on high-speed paper collection technology needs to be further strengthened in addition to the paper feed problem. Another big problem that is presently shown is the uneven delivery of paper at high speeds. In the past, the problem was not sufficiently understood, and the problem of low machine speed was attributed to the paper feeding part. The impact of the paper collection on the machine speed is now more and more prominent. The paper collection technology has progressed the slowest. There are few scientific research projects related to paper collection technology. Many institutions have not changed fundamentally for many years. For example, the structure of the take-up chain, the parameters of the chain-down speed ratio of the take-up chute, the powder spraying mechanism, etc. have not been changed due to their generality. Many single-dual-color machines use paper collection technology directly to multi-color machines. Now it is necessary to improve the working performance of the delivery section. Each technology within it must be carefully studied item by item. Find out its weaknesses to improve and improve.
Ten, multi-functional technology research should mention the schedule
In addition to the completion of the printing function on the printing press, the post-press function needs to be added. This technology was outstanding in the last drupa exhibition. In addition to the traditional glazing and other functions. Also need to consider adding bronzing die cutting, laminating and other functions. This can greatly reduce the loss of printed products. So as to improve efficiency. The purpose of reducing costs.
Safety standards should become an important standard for products and be effectively implemented with the rapid growth of international trade. Safety standards have become one of the biggest "obstacles" for China's equipment to enter the international market. For a long time, our insufficient understanding of safety standards has led to some equipment not allowed to operate at international exhibitions. The safety standard is not just to add a shield. It includes a lot of content. Some are directly related to the machine design, such as the specified safe operating distance. It is hoped that printing equipment manufacturers can contact the Printing Machinery Standardization Committee as soon as possible. Implement safety standards as soon as possible. So that our equipment can enter the international market as soon as possible.
L Shape Height Adjustable Desk
Lifting slide table is a kind of work table that can be raised or lowered by electric or manual means, which can be used for office, study, painting, writing and other activities. According to different classification standards, lifting and sliding tables can be divided into the following types:
1. Functional classification: lifting sliding table can be divided into single motor, double motor and three motor and other different types, with different lifting speed and bearing capacity.
2. Operation mode classification: the lifting sliding table can be divided into pneumatic and electric operation modes, and the moving operation can be realized by pushing buttons.
3. Classification of sliding way: lifting sliding table can be divided into two types with wheels and without wheels. The table with wheels can easily move the position, while the table without wheels is more stable.
4. Desktop material classification: The desktop of the lifting sliding table can be made of different materials, such as wood, metal, glass, plastic, etc., each material has its characteristics and application occasions customized.
5. Size classification: The lifting sliding table can be selected according to the height of the user and the size of the required working space. The common sizes are small, medium and large.
In short, choose suitable for their own lifting sliding table need to consider many aspects of factors, such as function, operation mode, sliding mode, desktop material and size, in order to meet their own work needs and personal preferences.
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Suzhou Herstar Medical Technology Co., Ltd. , https://www.htstandingdesk.com