For traditional business printing , the imposition method directly determines the way the paper is opened and the way it is printed. The optimized high-quality imposition method can often directly improve the quality and efficiency of printing and reduce costs.
First analyze the normal off-printing. If you print 6 kinds of horizontal 420mm × 285mm double-sided color DM single pages with the same content on the back side, denoted by T, the front side is represented by A, B, C, D, E and F respectively. The most common imposition method is as follows. As shown in Figure 1, this seems to fit the imposition requirements, but it is obviously not the best imposition method. The best imposition method should be Figure 2, which can greatly improve printing efficiency without adding any cost.
In another example, the printing 420 mm × 285 mm double-sided color DM single page is still taken as an example, and F and T are used to indicate the front and back sides, respectively. Common imposition methods are shown in Figure 3 (a) or (b), but there are certain drawbacks. At this time, the best imposition method is as shown in Fig. 3(c), which fully considers that each ink key controls one longitudinal narrow strip area, which effectively reduces the printing difficulty. In particular, if a job is important (red or too large, too large content blue) in the right half of the F (T or left half), the advantages of the embodiment will be more apparent imposed, because for offset printing machines It is said that the color reproduction ability of the lateral middle portion of the drum is the best, and the printing difficulty is relatively low. If the important content is in the left half of F, we can rotate the graphic 180 degrees before the imposition, and then imprint in the above way.
For the special-shaped version or single page, it can better reflect the decisive role of the imposition method in the printing process, especially for the paper opening. For example, printing a 40p internal text book of 220mm × 300mm, according to the normal idea, it is classified into 8 printed plates, which is 5 printed sheets and 40 CTP plates. However, the imposition does not give full play to the printing performance of the offset color offset printing machine. Generally, the short side of the boot printing web is more than 640 mm (the short side of the individual model exceeds 700 mm). To this end, we can use the Figure 4 imposition method, the 787mm × 1092mm paper is changed to 780mm × 628mm and 780mm × 458mm two parts, without wasting paper, successfully changed the 8 open album to 10 open printing. This also increases plate utilization, paper utilization, and printing efficiency by 20%, greatly improving the performance ratio.
In another example, a 210mm × 145mm double-sided color single page is printed, and the optimal imposition is four rows and four columns (4 single pages compared to three rows and four columns of opposite sides), and the effective printing format is 852 mm × 604 mm, and 889 mm at the same time. ×1194mm paper is changed to 885mm×616mm and 885mm×574mm. When printing, the larger part will be printed first. After printing, only the image part beyond the plate mouth will be repaired. In the small part only You need to print three rows and four columns. This solution improves the efficiency of paper use by 15%. If you print a 53-page (ie 106p) weekly desk calendar of the same size, the original imposition is 4.5 printed sheets (four rows and four columns of impositions are 24 open, 106p/24 open 4.5 prints), after the above-mentioned imposition and corresponding unloading For 4 sheets printing (106p/28 opening 4 sheets, of course, there are other accessory products that can be used to fight 6p), which directly improves the effective utilization of the plate and paper and improves the performance ratio.
Another special case is the printing of the A4 answer sheet. The 120g/m2 double-adhesive paper usually used is only 889mm × 1194mm paper (if it is 880mm × 1230mm paper, it can be printed directly, but the paper utilization rate is low, ie High cost), can also be printed according to the standard large 16 open. If the latter is used, it is necessary to rotate the A4 graphic by 90 degrees and horizontally by four rows and two columns of four-open imposition, corresponding to four-open printing, which can be completely solved.
In summary, the optimized imposition method has greatly improved from the utilization rate of the plate and paper to the printing efficiency, and directly improves the efficiency, productivity and profit rate for the printing enterprise.
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