Features of CTP From the point of view of the direct plate-making equipment currently used, there are complete sets of equipment suitable for newspaper printing plants and large-scale printing plants, as well as small plate-making equipment suitable for small and medium-sized enterprises. Because the specific service targets of the direct plate-making equipment are different, the requirements for the precision of the direct plate-making plate are also different. Therefore, the characteristics of different types of direct plate-making are also different. The main features of CTP are as follows: ①Completely cancel the film technology and corresponding materials, greatly simplify the process and significantly shorten the plate-making time; CTP improves printing quality Computer direct plate-making recording dots have high quality, small dot changes, and can record FM dots well; highlights and dark dots have good reproducibility and large gradation range; there is no problem of printing plates with dust and film edges; plate printing is accurate Sex is very good. In all cases, it is superior to the traditional CTF process. Moreover, computer-to-plate making has almost no possibility of misoperation of printing plate exposure. CTP improves production efficiency and economic benefits The CTP system canceled the film and related process equipment, which greatly shortened the printing plate-making time and improved the timeliness. It saves the time of manual trimming of the dirty spots of the printing plate and the edges of the film. Digital imposition has replaced the time-consuming film imposition in traditional printing. Compared with traditional plate making, CTP plate making speed can be increased by more than 3 times. In CTP, exposure and imaging time are the core factors that affect productivity, and imaging time increases as resolution increases. At a resolution of 1200dpi, the minimum imaging time for a 70cm x 100cm printing plate is about 2min. Some CTP systems have a high degree of automation. If there is sufficient data and printing plate supply, they can be run directly without any operator. In commercial printing, book printing and newspaper printing, the requirements for plate-making productivity are different. In commercial printing, the printing plate is completed during the daily working hours, usually 10 sheets / hour, and some CTP systems can reach 20-30 sheets / hour. In newspaper printing, a large number of printing plates must be completed in a short period of time (a few hours). Its quality is lower than that of commercial printing, and the imaging resolution of newspaper printing is also low, usually between 800 × 1400dpi. Relatively shorten the imaging time. Some newspaper CTP systems can achieve a productivity of over 100 sheets / hour. Computer direct plate making has cost advantages. Because the cost of film and development processing is eliminated, the amount of waste paper, ink and fountain solution used for trial printing is reduced, the utilization rate of the printing machine and post-press processing equipment is increased, and the pre-press and printing preparation time is saved. Reduce costs. Especially with the printing machine that applies digital ink preset technology, it can shorten the production, accurate registration and preset ink time according to the situation of the printing plate, save the adjustment time, and the record repeatability is good. short. The CTP system has realized data exchange and format unification from pre-press to the printing control system. Several issues to be noted when using CTP process 1) According to product demand, choose CTP process In the current production, products are divided into two types: commercial plates with priority to quality and newspaper plates with priority to speed. In the commercial plate making with priority to quality, the main body of the product is high-quality prints, exquisite samples, fashion magazines and other high-quality prints, which have high requirements on the color, level and clarity of the product, especially the reproduction of high-light and dark-tone dots Better than CTF. Sometimes need to use a variety of screening technology of network outlets, such as FM screening and AM screening composed of mixed outlets, so the slow CTP process should be used. As for the speed-first newspaper platemaking, the main products are newspapers that focus on timeliness and color books and magazines with lower quality requirements. The time requirements are higher than the quality requirements, and most of them are printed on semi-commercial or newspaper rotary machines. The gradation of the image is short, and the color reproduction requirements are relatively low. Amplitude screening with a low number of screen lines is mainly used. Therefore, a fast CTP process can be selected. 2) Quality control is very necessary for the production of printing plates It is necessary to detect exposure errors resulting from occasional defects in software and hardware: some images or text are sometimes missed, photos are not corrected, etc. These errors often appear in explanations or issues. Therefore, it is very important to use digital proofing to check the printing plate. These errors can be detected before printing. The calibration of the production line must also be monitored, especially the plate output machine, which can use imaging control strips. The digital printing plate control strip has many different functions of the control section, which can be visually inspected by the naked eye or densitometer / magnifying glass. The control strip is embedded in the document to be output, and is sent into the output system together with the page and paper parameters. It can be used to find the cause of quality defects in the output due to parameter changes. The density measurement of the printing plate can provide relative measurement value, this method is suitable for daily production control. The tolerance range of temperature and chemical composition in the developing tank of the printing plate must be very small. Only in this way can a stable developing effect be obtained. If it deviates from the ideal value, satisfactory plate quality will not be obtained, such as unclear dots or expanded dots. For polyester-based printing plates will be subject to some limitations of overprint accuracy. 3) Precautions when using CTP output in DTP process ①Pay attention to the interface technology with the front-end system. For large-capacity files, the speed of data exchange and data transmission are crucial. ② A new set of electronic document management system should be established to improve data storage and retrieval technology. ③Color management technology and RIP technology are also very important. Large-capacity files require RIP to have strong processing capabilities before they can achieve efficient work efficiency. ④ Have experience in using PostScript electronic prepress system. This experience can ensure that pre-press technicians are familiar with basic file processing and fault checking, and can quickly find and solve font problems, missing images and poorly constructed documents in time. ⑤ Sufficient plate consumption is required. 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â‘¡It can output various printing plates to meet the requirements of printing presses;
â‘¢The printing plate can be accurately positioned during plate making to ensure the registration requirements of the printing plate;
④High resolution, with output precision of 3000 ～ 5000dpi;
⑤ can form 175 ~ 300lpi, 256 tone points;
â‘¥ The plate making speed is fast, and a printing plate can be made in a few minutes;
⑦The precision of the four-color printing plate is good, which meets the printing requirements, and can prevent the phenomenon of moire caused by the shape and angle of the dot;
⑧ Has good operability, can be automatically conveyed, automatically exposed, automatically developed, to ensure that the production of printing plates is carried out accurately;
⑨Can produce good economic benefits.
