When developing the Jprint double-sided machine, Akiyama conducted a survey on the business characteristics of the international printing industry. The survey showed that 70% of the printing business is double-sided printing, and more than 80% of the double-sided printing business is thin paper printing. Jprint series double-sided printing offset printing machine is an offset printing machine developed for thin paper double-sided printing, which has excellent thin paper printing ability.
Cambridge University Press spent three years looking for an offset press suitable for 28 grams of paper and contacted all major suppliers in the offset press manufacturing field. However, after several different types of offset printing presses were tested, only one manufacturer's products could meet the standard, that is Qiushan International's Jprint series double-sided printing offset printing presses. At the beginning of 2003, JP4P444 offset printing machine was installed and put into use in Cambridge University Press, which was highly praised by Cambridge University Press. Alan Dunger, director of the publishing house, said: "Akiyama double-sided machines have provided Cambridge University Press with multiple benefits, providing users with the ability to print lighter materials than originally envisioned. Printing with 25 grams of paper is no longer uncommon. And created a record of 22 grams of thin paper printing. " Alan Dunger further stated: "The factory believes that this is the only offset press in the world that can print high-quality books and periodicals on such light materials, and it is very outstanding when printing difficult materials."
1. Jprint series double-sided printing offset printing machine porcelain lining technology
Imprint cylinder porcelain liner technology is the key technology of Jprint double-sided printing offset printing machine, which not only solves the problem of protecting the printing surface patterns when printing on both sides at the same time, but also provides enough printing pressure to achieve the simultaneous printing of multiple colors on both sides. Exquisite patterns.
The bottom is a stainless steel sheet, the middle is a ceramic spray coating, and the top is covered with a special coating of non-stick ink. The surface of the porcelain lining has uniform and irregular roughness. Porcelain lining technology is a cooperation between Akiyama Corporation and Nippon Steel Corporation of Japan. After a lot of trials and failures, the trial production was successful. The impression cylinder uses a porcelain lining, which can effectively prevent ink sticking and ink accumulation during the printing process.
2. Jprint series double-sided printing offset press paper transfer without impact system-conjugate cam technology (Qiushan patent)
Akiyama Jprint series offset presses adopt the conjugate cam technology in the paper handover, completely eliminating the impact of paper handover, realizing the simultaneous opening and closing of each bite on the same shaft, fundamentally improving the stability and stability of paper handover reliability.
In the past, the opening and closing of the teeth of the sheet-fed offset printing machine used traditional cam control, that is, the teeth were opened (or closed) by the cam, and then the teeth were closed (or opened) by the spring restoring force. At this time, the roller follower There must be an impact on the cam. At the same time, due to the elastic deformation of the bite shaft, there is a certain time difference in the opening and closing time of each bite on the same bite shaft. As the printing speed continues to increase, the impact of the roller follower and the difference between the opening and closing time of the teeth will have a non-negligible effect on the overprinting accuracy of the multicolor offset press.
For this problem, some mainstream offset press suppliers in the world have adjusted the cam profile and increased the diameter of the bite shaft to reduce the impact of the impact of the roller follower and the difference between the opening and closing time of the teeth. But the effect is not obvious. Akiyama International has adopted a paper transfer impact-free system with conjugate cam technology as the core, effectively solving this critical problem.
The conjugate cam is composed of a pair of matched cams, which respectively control a roller follower on the teething shaft. Among them, one cam controls the opening of the teeth, and the other cam controls the closing of the teeth, which directly eliminates the impact of the roller follower on the cam. At the same time, when the conjugate cam is assembled, a reasonable pre-deformation is applied to the bite shaft, which can counteract the negative effect of the elastic deformation of the bite shaft and ensure the synchronization of the opening (or closing) of each bite on the same bite shaft.
This patented technology of Qiushan International has revolutionized the paper transfer method of offset printing presses, and its technological level ranks in the international leading position.
3. Among all kinds of double-sided printing methods, Jprint double-sided offset printing machine is the most reasonable alternate front and back printing. The printing conditions on the surface of each cylinder are the same, ensuring that there is no difference in the quality of front and back printing.
The use of a single-diameter impression cylinder not only makes the height of the Jprint double-sided offset press more reasonable, but also reduces the cost of replacing the porcelain lining. Other 4/4 models mostly use double-diameter impression cylinders. When replacing the porcelain lining, two porcelain linings of the same impression cylinder must be replaced together, because porcelain linings are expensive, which will cause replacement costs Increase. Otherwise, because the thickness of each batch of porcelain lining is inconsistent, it is impossible to guarantee that the printing lengths of the A and B sides on the same impression cylinder are completely consistent, which will cause the difference in the printing quality of the A and B sides. This is one of the reasons for using a single-diameter impression cylinder.
It occupies a small area, which is half of the floor area of ​​a double-sided printing machine. Because it is printed on both sides at the same time, the color matching operation on the front and back sides is very easy.
Jprint double-sided offset printing machine has the same phase cylinder arrangement, which makes the semi-automatic plate changing more efficient and effectively reduces the printing preparation time.
Qiushan's original cylinder arrangement is in the same phase mode (in-phase: the plate cylinders of each color group are in the same position and direction), and the four plates of the upper (lower) color group can be replaced at the same time, relative to the non-synchronized cylinder arrangement In terms of, its version change efficiency is higher. The printing plate is precisely punched by a special printing plate punching machine, and the positioning reference when punching is the cross overprint mark on the printing plate. After changing the plate, make a little adjustment to enter normal printing.
The introduction of the above Jprint double-sided printing offset press shows that compared with other international mainstream suppliers' double-sided printing offset presses, Qiushan International's Jprint double-sided printing press represents the most advanced level of similar international products and is currently a domestic printing company. The best double-sided printing offset press available.
Nowadays, the Chinese printing market is developing rapidly in the direction of multiple varieties, small batches, and short delivery times. With traditional machinery and traditional methods, it has been unable to gain an advantage in the fierce competition, and it is also difficult to ensure that it can maintain the current long-term future. Some profit status. Qiushan International's Jprint series sheet-fed double-sided multi-color offset presses provide users with an optimal solution, which will surely bring higher benefits and higher enterprise competitiveness to users.
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