CNC technology is widely used in machine tools and robot products. Servo technology and the corresponding drive system and operating system have achieved two companies in Japan, such as Fanark and Siemens in Germany, and high-end CNC equipment with more than five degrees of freedom in China. Depends on imports. After years of hard work in China, enterprises such as Huazhong CNC in Hubei, KND CNC in Beijing, and aerospace CNC have appeared. Simple CNC systems have been localized, but these CNC systems mainly serve machine tools and other products. The independent drive system still depends on foreign companies. With the improvement of technological level, the independent drive system of sheet-fed multi-color offset press will continue to develop, and it is hoped that CNC system manufacturers will enter the field of printing equipment manufacturing as soon as possible.
1. Independent drive technology
In the domestic sheetfed offset press, only the ink and ink system uses independent drive technology. Among them, the functions of the ink discharge roller, water discharge roller, ink color remote control, and paper prefabrication are digitized. Continued expansion is the direction of technological innovation. There are already supporting enterprises in China that have begun to manufacture independently driven paper feeders, and a few companies are also manufacturing sheet-fed offset presses that are separate from the paper feeders. In recent domestic exhibitions, there are several companies that can manufacture on-line UV glazing and drying equipment.
The next step of digital transformation of sheet-fed offset printing presses is to first digitize the equipment settings, such as paper feeder, ink feed, water discharge, etc., to separate from the main motion, and to further solve the servo control of paper prefabrication, ink remote control, automatic registration, etc. Only in this way can the information of pre-press platemaking enter the printing machine through the digital interface, and complete the automatic adjustment of the information. The independent drive of the non-profile technology, printing cylinder and paper transfer process is a major innovation for foreign companies. We still have some difficulties in entering, but we should believe that this technology is the direction of development, and qualified companies should be bold and autonomous Innovation.
2. Digital interface
Most of the domestic sheet-fed multi-color offset presses have not set up a digital interface. The pre-press plate-making information also needs to be manually adjusted and set, which not only takes up a lot of auxiliary time, but repeated adjustments and settings will also bring adjustment and ink color restoration. error. At present, the functions that the machine urgently needs to solve are automatic paper adjustment functions, including the paper feeder, take-up machine, gripper row, paper prefabrication of the front side gauge, automatic adjustment function of ink color restoration, etc., only with these functions digital interface Significant. Therefore, setting up a digital interface should be a top priority. Of course, while completing the hardware design, we also need to complete the software design, using RIP software to make pre-press and printing compatible with each other, so that the pre-press plate-making information can be quickly entered into the press, and repeated adjustment time and adjustment errors can be omitted.
At the Dongguan exhibition in Guangdong, the single-sheet multi-color offset printing machine has made new progress in the setting of digital functions. The 1020mm four-color single-sheet offset printing machine manufactured by Jiangsu Chang? N has already set up a digital interface and paper pre-production system. It can transmit the pre-press plate-making information to the printing equipment, reducing the adjustment of the printing press, and becoming the first enterprise to digitally transform traditional equipment.
3. Implementation of international standards
The digital integrated solution launched by Weifang Huaguang Precision Equipment Co., Ltd. has already achieved data sharing and centralized control of the desktop system-output equipment-CTP direct plate-making equipment-ink color remote control, which greatly shortened the printing cycle and improved printing efficiency. He quality is also on the newly designed machine, to achieve automatic loading, automatic washing blanket, diagonal adjustment of printing plates and other functions, to further improve the automation level of the equipment. Other companies began to install paper presetting systems and digital interfaces, and began to use CIP3, CIP4, JDF and other digital integrated file formats, but the digital connection after printing has not yet been realized, and the automation of the printing process and digital work are still very Big gap.
Compared with the digitalization level of foreign offset presses, there is a big gap in the application of domestic digital technology. The direction of digital development has been shown earlier. However, this comparison still stays in the stage of relying on imitation development, of course, this is not enough. Independent innovation in the digitalization of offset presses will become our key effort, otherwise we will never catch up with the advanced foreign level, and independent innovation can be surpassed in the following aspects.
1. Continue to expand the scope of application of web offset presses
The digital transformation of the web offset press is relatively successful. The transmission of the equipment has been fully driven independently, and industrialization should become the focus of development in the future. The setting, operation, parameter display, running status and fault display of printing equipment have been digitized, and improving stability and reliability is the goal of development. Automatic loading, paper roll conveying, automatic paper receiving, residual paper roll output, centralized ink supply, centralized lubrication, online advertising inserts and packaging and bundling all have successful precedents and should be expanded according to user needs. For the mass printing market, web offset presses are the most promising printing equipment. In addition to newspapers and books, adapting to the development of commercial printing is the key direction of digital transformation. However, China's commercial web offset press is still in the stage of small batch production and sales. So far, it has only overcome the traditional DC speed regulation method, replaced by frequency conversion speed regulation, and has not yet achieved the independent drive mode of the main drive. Of web offset presses have achieved independent drive technology and digital transformation. In addition, newspapers, magazines and books are double-sided printing, packaging printing is mainly single-sided printing, to adapt to the post-printing of packaging products, which requires commercial web offset presses to achieve single-sided color printing requirements, but also requires equipment It has the function of cutting sheet paper or rewinding paper, so as to expand the scope of adaptation. If you can enter the packaging and printing industry, the market of commercial web offset presses will be greatly expanded, which is also the direction of independent innovation of web offset presses in China. .
2. Thinking about product innovation of sheet-fed offset printing machine
The independent innovation of sheet-fed offset printing machine can be drawn from three aspects. One is to transform the application of foreign equipment in independent drive technology to achieve the separation of the movement of the paper conveyor and the host, the independent drive of the printing cylinder, and the elimination of the two side pull regulations , Realize the detection and positioning and servo adjustment, and realize the prefabrication of paper, ink and water. Second, the independent innovation of large-format flexographic printing has been successfully trial-produced by two companies. This equipment adopts satellite cylinder arrangement structure and adopts independent drive to realize multi-color printing. Not only the printing paper path is shortened and the overprint is accurate, but also the floor space is greatly reduced. However, the satellite cylinder is very large in size and difficult to machine. KBA's 520mm satellite multi-color printing press uses a satellite-type impression cylinder and a new anilox roller for quantitative ink supply. This equipment has been fully driven independently and can also be an option for sheet-fed printing presses. The third is that the sheet-fed offset printing press that fully realizes the independent drive technology will be successfully developed. It is hoped that Chinese enterprises will work hard to create their own development path and take another big step to achieve the success of independent innovation.
3. Join and learn from foreign digital workflow
In 1995, 26 prepress, printing and postpress enterprises in the world jointly established an international cooperation organization (CIP3) for computer control of prepress, printing and postpress process flow. The main goal of the organization is to study and formulate a standard format to improve the quality of printing, reduce the production cost and increase the production efficiency with the digital process. In the printing process, CIP3 achieves paper format, ink volume, registration, and color quality control on the printing press. After printing, the cutting and binding parameters and information are transmitted to realize the cutting and binding control of the printed matter.
In early 1999, Heidelberg, Manroland, Agfa and Adobe, organized by CIP3, established the JDF alliance and reached an agreement with the original CIP3 alliance. CIP3 was changed to CIP4. The emergence of JDF format will automate the entire process of printing data. It not only promotes the transition from CIP3 to CIP4, but also more clearly extends the scope of "integration" to pre-press, printing and post-press fields.
Digital process flow is the development direction of the printing industry automation. From printed plate making to printing to post-press processing, the entire process of equipment adjustment has common information. This information flow represents the level of digitization. Foreign countries have passed CIP3, CIP4, JDF Such file format standards link the equipment in the printing process. The printing information is automatically adjusted through the digital interface to greatly improve the printing efficiency. China should join this alliance as soon as possible to accelerate the process of comprehensive digitization.
The competition between offset presses and emerging digital printing equipment without plates is mainly reflected in the field of short-run printing. With the deepening of the market economy, short-run printing will show a rapid growth trend, and its competitive advantage will gradually be widely recognized. Through the digital innovation, offset printing presses continue to maintain the advantages of the mass printing market, and the equipment suitable for short-run printing should also develop rapidly. The mechanism version of digital printing presses continue to innovate in reducing equipment prices, improving printing efficiency and reducing printing costs. There will also be a certain market, and Chinese enterprises should also enter this field and make their own efforts for the development of this equipment.
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