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Abstract:The author presents several latest technologies which are representative and tendency in current newspaper printing and sts out relevant firms and products being leading status.
After China's accession to the WTO, China’s economy has begun to integrate into the development of world economic integration. All aspects must be in line with international standards. The newspaper printing industry, like other industries, is also facing unprecedented opportunities and challenges. Therefore, it is imperative to develop new technologies for printing newspapers and enhance the competitiveness of newspaper printing to meet the needs of readers. Under this situation, we have ushered in the largest report exhibition in Asia - the 2nd International Exhibition of Newspapers and Related Technology Equipment Exhibition. The first China Press Fair in the new century. At the exhibition site, it can be pleased to see that newspaper printing equipment manufacturers have introduced solutions for digital plate making, digital printing, and complete digital workflow that meet the needs of the newspaper industry, fully reflecting the new technologies, new equipment, and new materials of the world’s newspaper industry. With the rapid changes, the extremely exciting contents displayed by many large newspaper groups in China reflect the tremendous changes that have taken place in China's newspaper industry in recent years. This article will briefly introduce several major new technologies of the newspaper industry such as waterless offset printing, spindleless transmission, seamless technology, and CTP technology.
First, waterless offset The traditional offset printing technology is the use of ink repulsion, oil and water to maintain the principle of balance, so as to achieve network transfer. It can be seen that the most difficult thing in offset printing is to control the ink-water balance, which is the key to the quality of offset printing. If there is too much water, the paper will wrinkle and the ink will be emulsified too much; too little water will transfer the ink to the non-graphic area. The ink ratio also affects the ink viscosity. There are many factors that affect the balance of water and ink, such as temperature, humidity, printing speed, paper type, printing machine performance, etc., but waterless offset printing technology does not require the use of aqueous solution version, the blank part of the printing plate is an ink-resistant silicone rubber layer, printing The ink used is a special waterless offset ink. Since waterless offset does not have ink-ink balance problems, there are many advantages. Japan's TORAY introduced the first practical waterless offset printing technology solution at the DRUPA77 International Exhibition. Two years later, its waterless offset printing plate began to be supplied to users. Its price is 2 to 4 times more expensive than traditional plate materials. , And it is easy to be corroded and easily damaged. Since then, many companies have devoted themselves to the research of waterless offset printing technology, waterless offset printing plates have been gradually improved, and the press resistance of plates on rotary presses can reach 300,000 impressions. At the DRUPA2000 International Exhibition, Japan's TORAY Corporation introduced a thermal CTP waterless offset printing plate, KPG also introduced a thermal CTP waterless offset printing plate with a resistance force of up to 200,000 printing, while PRESSTEK, ADAST and XEROX cooperated. Thermal PAX waterless plate was introduced.
The biggest advantage of waterless offset printing is that it eliminates the hassle of controlling the ink-water balance. Waterless offset control of ink temperature through the operation window improves ink performance, dot reproducibility is good, and overlay accuracy is high. Therefore, the image color of the printed product is clear and the quality is good. At the same time, the auxiliary time is shortened, waste of paper is reduced, and the amount of paper is reduced. Environmental pollution. Waterless offset printing has been widely used on many types of sheetfed digital presses. For the first time, the KBA CORTINA newspaper press launched at the DROP 2000 exhibition by the German KBA has applied waterless printing to newspaper printing. Due to the use of waterless plate and inkless technology, this machine saves the color printing process with the ink color adjustment process, resulting in a significant reduction in the waste reporting rate, and the overall height of the equipment is greatly reduced (only 3.4m, the second layer is added). After the printing tower is also only 7m), easy for workers to operate. KBA CORTINA newspaper printers use a semi-automatic plate changer with a maximum print speed of 80,000 copies/hour. This series of high-tech environment-friendly printers, including a combination of non-spindle transmissions, will be officially launched this autumn.
Waterless offset printing has just started in China, because the anhydrous plate and ink are imported. The high price has severely restricted the development of waterless offset printing in China. However, the merits of this technology make us urgently need to speed up research so as to make it shine in our country's commercial printing and newspaper printing.
Second, no main transmission shaft technology without main shaft technology referred to as the shaftless transmission technology. The rapid development of electrical and electronic technology has made the use of shaftless transmission technology on offset presses a major trend. Major printer manufacturers in the world, such as Heidelberg, Manroland, KBA, Goss, and others, have introduced presses that use shaftless transmission (including commercial printers and newspaper printers).
Compared with the shaft drive, the advantage of the shaftless transmission is self-evident. The electronic shaft replaces the mechanical shaft, which makes the transmission more accurate, reduces the mechanical wear, noise and mechanical vibration, and helps to improve the printing quality and increase production. The flexibility saves installation time.
Man Roland VNISENT machine is an advanced double-diameter single-page 8-page web offset press with a printing speed of 70,000 copies/hour. Since the folding and duplex printing units have separate shaftless transmissions, they are greatly improved. The diversity of production can be prepared separately on several different units at the same time, and several operators can change the plates at the same time, which greatly shortens the production support time and is particularly suitable for short live printing.
KBA COMET 70 machine printing unit is H-type structure, printing speed is 70,000 copies/hour, each printing color group, deflection group is driven by a main motor, no main transmission shaft, no axis control system is connected by optical cable The SERCOS data network transmits and controls data through a host computer to achieve synchronous control functions. The center console is controlled by the BASKO tension control system and driven by a separate AC servo motor to ensure precise control of the paper tension during printing.
Heidelberg Mainstream Machine MAINSTREAM 80 is a double-format single-path newspaper printer, which combines a series of advanced technology from Heidelberg: linear drum arrangement, seamless blanket cylinder, advanced ink supply line design, etc., due to the use of independent communication Drive technology makes it very easy to switch the operating status of a single printing unit, so the advantages in editing version changes are very prominent, and editing version replacement is necessary when the newspaper layout changes or when the latest information needs to be added. Compared with the DC drive, the synchronously controlled AC drive speed is better adjusted. This motor can achieve more precise digital control of printing speed and roll paper force, effectively reducing the possibility of web breaks, and reducing the adverse effects of vibration on print quality, thereby improving print quality and productivity.
In recent years, China has also made a welcome step in shaftless technology. The URB-H-002 web offset press recently developed by Shanghai Goss has adopted shaftless technology, PLC program control and ink color remote control technology. The Beiren Group’s YP4787G-W web offset lithographic printing press is adapted to the needs of press expansion and printing of multi-color and red newspapers. It adopts a modular design, flexible and diverse machine configuration, high speed and high automation. The machine's folding units and printing units are all equipped with German shaftless transmission control system, which has achieved diversification of production varieties. In addition, the auxiliary time for adjusting machines can be greatly reduced. The YP 4787 II web lithography press, which was introduced last year, represents the highest level of Beiren Group's printing press. It adopts advanced shaftless transmission technology, hollow roller bearing gapless support structure and advanced ink color remote control device. , And quoted imported high-speed tying machine, printing speed up to 60,000 copies /
Third, the seamless technology Traditional printing machine blanket interface meets, will produce the vibration and cause the ink stick, Heidelberg company invented the seamless cylindrical blanket in 1993, because it has no seam, has eliminated the vibration, namely has Dynamic stability, so even at high speeds of 80,000 parts per hour, excellent quality prints can be obtained. Compared with the traditional blanket with the same perimeter, the use of a cylindrical blanket can make the effective printing area larger and the cutting size reduced. It can be seen that the seamless blanket can significantly reduce paper waste. Its other distinguishing feature is that it is extremely easy to replace and can usually be replaced within one minute without disconnecting the web. This new technology, Heidelberg, has been applied to the SUNDAY (Sunday) presses to provide a wider drum format, faster speeds, and higher print quality. In short, seamless technology has enabled the speed of newspaper presses to be further improved, enabling future newspaper presses to increase their competitiveness in terms of printing capabilities, production efficiency, and economic benefits.
Fourth, CTP technology The meaning of CTP is offline computer-to-plate, computer-to-press, computer to paper/print, and computer to proof. CTP technology originated in the 1980s, but it took five to six years to actually put it into use in offset printing. At the DRUPA 95 international exhibition, Agfa, DuPont, Kodak and other companies exhibited CTP plates and equipment, and computer direct plate making The latest technology became the theme of the exhibition. In the following years, CTP technology developed extremely rapidly. The world-famous prepress equipment companies competed for this market. At the DRUPA 2000 international exhibition, CTP technology once again shakes the entire exhibition and becomes the biggest highlight of the exhibition. By the 2001 PRINT 01 exhibition in Chicago, CTP technology has made remarkable progress, such as the introduction of a more flexible IMAGY MAKE direct plate-making machine for commercial printing, which is used in newspaper printing and magazine printing. The efficient CTP DMX solution was introduced. The DMX system has high resolution, high speed and good stability. Heidelberg, Agfa, Baldwin, and other companies introduced violet laser CTP technology after DRUPA 2000, and Fujifilm introduced Brillia LH-NI thermal plate in 2001. It is a “map†and “preheatâ€. Plate material, resistant to print force up to 50 to 800,000 printing, if baked version up to 1 million printing. In recent years, various printing magazines have introduced articles on CTP technology. It is indeed an unprecedented CTP fever in the global printing industry. This is due to the fact that the platemaking process of the direct platemaking technology has a short plate making cycle and takes up less time for loading the plates, thus shortening the production cycle of the printed matter and improving the printing quality. It is said that CTP technology has been ranked first in the printing high-tech industry for four years in a row. At present, at least over 6,200 sets of direct plate-making systems have been sold worldwide. The complete CTP system includes CTP plate, CTP equipment, digital workflow and digital proofing. CTP plate is divided into two major categories: photosensitive plate and thermal plate. The rapid development of thermal technology and steady improvement of its quality make the thermal CTP plate forest mature gradually and gradually become the mainstream of the market, due to the use of thermal CTP technology. Room operation, high resolution and high resistance to printing, and no pollution, so more and more famous prepress companies are rushing to introduce their thermal plates and thermal platesetters. At present, high efficiency and high stability are the most important in the newspaper industry. The requirements of the India Force can be slightly lower. Therefore, the optical release type plate is the first choice for many newspaper printers. The exposure system of the CTP equipment is divided into three types: drum type, outer drum type, and platform type. The platform type direct plate making machine is commonly used by newspaper printing plants due to the characteristics required for newspaper printing.
CTP technology simplifies the plate-making process. Graphical information can be output directly to digital proofing equipment. It can also be directly recorded on a thermal plate. No data is lost, and the sharp points of the network do not expand. The biggest advantages are fast speed and high quality. It is very suitable for the high timeliness required by newspaper printing. This is the reason why CTP technology develops rapidly in the newspaper printing industry. The CTP system requires a huge amount of investment. In the newspaper industry, especially the big newspaper group companies are generally well-funded and have strong technical strength. They are very sensitive to new and high technologies and are actively accepting and adopting new technologies. This is also part of the CTP system in China. Another important reason for the rapid introduction of industry group companies.
For the middle newspaper printing company, although it is recognized that the CTP technology is a trend in the newspaper industry, due to the one-time investment of the system (about several million yuan), and consumption supplies such as: plates, syrups, etc. must rely on imports (its version
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