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Technical analysis of investment in commercial rotary offset printing press

commercial printing is one of the topics that people have talked about more in recent years. Unlike newspapers, books and periodicals and some printed materials that meet special needs, the commercial printing market is mainly aimed at color printing products that have high requirements for printing quality, increasingly use light-weight and diversified paper, and have flexible binding methods, such as a large number of periodicals and magazines, newspaper inserts, luxury newspapers Magazines, newspapers and more and more commercial publicity materials (such as direct mail manuals, shopping guides, supermarket publicity materials), etc. In order to meet the needs of this rapidly growing printing market, printing equipment manufacturers have developed various types and specifications of commercial rotary printing equipment, but the differences in structure, function and price of printing equipment from different manufacturers will inevitably lead to differences in application fields and markets. Therefore, in the face of a wide range of commercial rotary printing equipment produced by different manufacturers, how to choose from the perspective of equipment function and technology, make reasonable investment, and make the investment project give full play to the maximum efficiency is a problem that printers must face. Therefore, we make a technical analysis on the investment of commercial rotary printing machine from the perspective of equipment composition, performance and configuration, for the reference of printers. At present, the basic characteristics of the commercial rotary offset press are that the column "five years of hard work and major technological and equipment achievements" is set up on the Ministry's dual micro platform. The difference between the commercial rotary offset press and the sheet fed offset press is that it must meet the requirements of completing large print volume printing in the shortest time, and have the necessary post press processing means such as online folding. Therefore, compared with the sheet fed offset press, the commercial rotary offset press has the characteristics of fast printing speed and high production efficiency. The experimental method of sudden smoke and fire damper GB 15931 ⑴ 995 is more suitable for the rapid printing of large print volume. On the other hand, the commercial rotary offset press is different from the web offset press in that it has higher requirements for the printing quality of printed matter, which makes the commercial rotary offset press have the characteristics of more accurate tape tension control, more accurate automatic paper receiving and higher precision automatic registration adjustment. At the same time, due to the type of paper and ink used and the characteristics of high-speed and multi-color printing, commercial rotary offset presses generally require drying and cooling systems. It can be seen that in order to better meet the printing needs of commercial printing, modern commercial rotary offset printing machines have the advantages of high printing speed (generally the printing speed is not less than 40000 copies/hour), wide application range of paper (the weight range of paper can reach 36g/m2 ~ 130g/m2), good printing quality (up to 300 lines of printing can be printed), high production efficiency (the use of various automatic control systems) Good economic benefits (printing, folding, cutting integration) and other outstanding features. In recent years, great changes have also taken place in commercial rotary offset printing machines. In recent years, the market trend of commercial rotary equipment has changed, including changes in the heating mode, changes in the structure and arrangement of printing rollers, changes in the ink and water transmission system to the folding device, changes in the tension control mode, changes in the setting and control mode of auxiliary devices, as well as the application of more and more automatic setting, detection and operation control systems, Each change has made the commercial rotary offset press have higher printing quality, faster printing speed and efficiency, more convenient use and operation, and obtained a wider application market. Commercial rotary offset printing machine is a type of web printing equipment. It uses the principle of lithography to print, so it has the basic characteristics and composition of lithography web printing machine. At the same time, in order to meet the special type of print printing market, commercial rotary offset press has some unique characteristics and functions. The basic composition and performance are similar to other types of web offset printing machines. The basic composition of commercial rotary offset printing machines includes paper feeding device, printing device and post press folding device. Considering the characteristics of commercial printing, commercial rotary offset printing machines are generally equipped with drying and cooling systems, which can instantly print out complete experimental reports and curves. The paper feeding device is mainly divided into two parts, namely, the paper roll control system and the paper tape control system. The paper roll control system includes a paper rack that meets the requirements of paper roll installation and adjustment, an automatic paper receiving device that meets the requirements of paper changing without stopping the printer, and a paper roll braking device that meets the requirements of jointly controlling the paper tape tension with the paper tape tension generation device. The paper tape control system includes the guidance system for guiding the paper tape direction, turning and translation, the paper tape tension control system for generating and controlling the paper tape tension, the automatic registration adjustment device that meets the requirements of printing accuracy, and the automatic paper threading system that ensures to reduce the auxiliary time and reduce the labor intensity of workers. Compared with traditional materials, this composition follows the basic principle of lithography, including printing cylinder parts, ink conveying parts and water conveying parts. The arrangement of printing rollers basically adopts the unit type B-B roller arrangement with horizontal paper feeding. In order to meet the requirements of fast and simple clutch pressure, pneumatic clutch pressure device is usually used. Compared with the web like printing machine, the ink feeding device of the commercial rotary offset press adopts more ink leveling rollers to quickly mix the ink, and has the ability of rapid response when adjusting the ink volume. The direct wetting system is widely used in the water conveyance device to ensure the uniformity of the water film on the printing plate. Post press folding device is an essential standard configuration for commercial rotary offset press. The printed paper tape passes through various folding processes such as (longitudinal cutting), longitudinal folding, transverse cutting, transverse folding, (longitudinal folding) and completes the post press folding of commercial printed matter. The use of the disc knife in the slitting device depends on the relationship between the width of the paper tape and the size of the final printed matter; The longitudinal folding triangle is an important device to ensure the accuracy and position of the longitudinal folding of paper tape; The cross cutting sawtooth cutter cuts the continuously printed paper tape into a certain size sheet of paper; The folding knife and folding plate on the folding drum complete the horizontal folding requirements of the printed matter. If you need to complete the folding requirements of 16 folio commercial printed matter, you can also use the longitudinal folding device with a folding knife and a folding roller. Drying and cooling device is an important part of commercial rotary offset press. Facing the thermosetting ink used in commercial printing, the drying system must be equipped on the high-speed multi-color printing equipment to solve the problem of ink drying on printing. The frequently used hot air drying method is to take away the volatile solvent on the surface of the printed matter at the fastest speed through the high-temperature hot air flow, so that the printed matter of high-speed printing can be dried in the shortest time. The cooling system works in conjunction with the drying system. The heated printed matter is easy to shrink and deform, and the paper becomes brittle, which affects the post press processing. The cooling system can restore the characteristics of the printed matter, and ensure the gloss, dimensional stability and post-processing characteristics of the printed matter. New configurations and functions with the progress of technology related to printing equipment and the increasing demand of the rapidly developing commercial printing market, new types and brands of commercial rotary offset presses are also emerging, and various commercial rotary offset presses are undergoing remarkable changes. The use of the new device and the change of the control mode have improved the printing function and quality control of the printing equipment, and become the highlight of the commercial rotary offset press

reprinted from: keyin media

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