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 the structure, function and price of printing equipment from different manufacturers will inevitably bring about The application field and the market are different. Therefore, in the face of a wide variety of commercial rotary printing equipment produced by different manufacturers, how to make a targeted choice from the perspective of equipment function and technology, reasonable investment, and maximize the effectiveness of investment projects, printers must face Right question. To this end, we do a technical analysis of the investment in commercial rotary presses from the technical perspective of equipment composition, performance and configuration for printers' reference.
Basic characteristics of commercial rotary machines
At present, the most widely used is the commercial rotary offset press. The difference between the commercial rotary offset press and the sheet-fed offset press is that it must meet the requirements for completing a large amount of printing in the shortest time. At the same time, it must have online folding. Post-press processing means. Therefore, the commercial rotary offset printing machine has the outstanding characteristics of fast printing speed and high production efficiency compared with the sheet-fed offset printing machine, and is more suitable for the fast printing needs of large-volume printed matters. On the other hand, commercial web offset presses differ from news web offset presses in that they require higher print quality, which makes commercial web offset presses require more precise tape tension control, more accurate automatic paper pick-up and Higher precision automatic registration adjustment and other features. At the same time, due to the type of paper and ink used and the characteristics of high-speed, multi-color printing, commercial rotary offset presses generally require a drying and cooling system.
It can be seen that in order to better meet the needs of commercial printed matter printing, modern commercial rotary offset presses already have fast printing speeds (generally printing speeds of not less than 40,000 copies / hour) and a wide range of paper applications (paper weight range up to 36g / m2 ï½ž 130g / m2), good printing quality (printing up to 300 lines), high production efficiency (use of various automatic control systems), good economic benefits (integration of printing, folding, and cutting), etc. Salient features. In recent years, great changes have taken place in commercial web offset presses.
In recent years, the trend of commercial rotary equipment market trends has changed, the changes in the structure and arrangement of printing cylinders, the transfer of ink and water systems to the folding device, the change in tension control mode, the setting and control of auxiliary devices Changes, as well as the application of more and more automated setting, inspection and operation control systems, each change makes commercial rotary offset presses have higher printing quality, faster printing speed and efficiency, and more convenient use and operation , Gaining a wider application market.
Commercial web 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 lithographic web printing machine. At the same time, in order to meet the special type of printed matter printing market, commercial rotary offset presses have their own unique features and functions.
Basic composition and performance
Similar to other types of web offset printing presses, the basic components of commercial rotary offset presses include paper feeders, printing devices and post-press folding devices. Considering the characteristics of commercial printing, commercial rotary offset presses are generally equipped with drying and cooling system.
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 holder that satisfies the requirements for installation and adjustment of the paper roll, an automatic paper receiving device that satisfies the requirement of the non-stop paper change of the printing press, and a paper roll braking device that satisfies the control of the paper tape tension with the paper tape tension generating device. The tape control system includes a guide system that guides the direction of the tape, reverses the tape, and translates the tape, a tape tension control system that generates and controls the tension of the tape, an automatic registration adjustment device that meets the requirements of printing accuracy, and ensures that auxiliary time is reduced. 1. Automatic paper-feeding system to reduce the labor intensity of workers.
The basic composition of the printing device is set in accordance with the basic principles of lithography, including printing cylinder components, ink delivery components and water delivery components. The arrangement of the printing cylinders basically adopts the horizontal-feeding unit-type BB counter-roll arrangement. In order to meet the fast and simple clutch pressure requirements, pneumatic clutch pressure devices are usually used. Compared with news web printing presses, the inking device of commercial rotary offset presses uses more ink leveling rollers in order to quickly distribute the ink, and has the ability to react quickly when adjusting the amount of ink. Its water delivery device widely uses a direct wetting system to ensure the uniformity of the water film on the printing plate.
A post-press folding device is an indispensable standard configuration for commercial web offset presses. The finished paper tape is subjected to (longitudinal cutting), vertical folding, horizontal cutting, horizontal folding, (longitudinal folding) and other folding processes to complete the post-press folding work of commercial prints. 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 product; the vertical folding triangle is an important device to ensure the accuracy and position of the longitudinal folding of the paper tape; the cross-cut saw blade will be continuous The printed paper tape is cut into a single sheet of paper of a certain size; the folding knife and folding plate on the folding cylinder complete the horizontal folding requirements of the printed matter. If you need to complete the 16-sheet commercial printing folding requirements, you can also use the vertical folding device with folding knife and folding roller.
Drying and cooling devices are an important part of commercial rotary offset presses. Faced with the thermosetting inks used in commercial printed matter printing, high-speed multi-color printing equipment must be equipped with a drying system to solve the problem of ink drying on printed matter. The hot air drying method that is often used is to take away the volatile solvent from the surface of the printed matter at the fastest speed through the high-temperature hot air flow, so that the printed matter printed at high speed can be dried in the shortest time. The cooling system works with the drying system. The printed matter after heating 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 advancement of technology related to printing equipment and the increasing demand for the rapidly developing commercial printed matter market, new types of commercial web offset presses and brands are also born, and various commercial web offset presses are undergoing dramatic changes. . The use of new devices and changes in control methods have improved the printing function and quality control of printing equipment, becoming the highlight of commercial web offset presses.
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