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In the printing of trademarks, labels, tickets or other products of different numbers and types of pages, the use of the combined printing on the same printing surface can save the printing plate material on the one hand, and on the other hand, it can effectively reduce the loading. The consumption of editions, school hours, and the consumption of paper and printing plates greatly increase economic efficiency. If a four-color offset printing press is to be printed on a four-color label product with the same paper and the same finished product specifications, their types (text layout and text are different) and the number of finished products are different, among which, A product is printed with 10,100 sheets, and B type products 8300 prints, 6,500 prints of C products, a total of 3 varieties. This series of products adopts off-size paper printing, which can be combined with 60 small prints (according to the requirements of the finished product). Then, for products like this type of finished product with different sizes and sizes, the three product combinations will be printed on the same facing surface, and only a four-color version will be required to complete the printing materials market. Then, how to determine the number of impositions of the three products A, B, and C?
First, the actual number of printed sheets must be calculated. The calculation formula should be: the number of printed sheets (excluding the loss rate) = the total number of finished products of 3 types (24,900 sheets) 拼 the total number of impositions on the release sheet The number (60 small editions) = 415 sheets (the number of prints of the folio). The number of impositions of each of the 3 types of products = the number of finished products of each smaller version respectively (415). Namely: A=10100÷415=24.3 small editions; B=8300÷415=20 small editions; C=6500÷415=15.7 minor editions. From the calculation results, it can be seen that the layout of A product on the split board surface 24 small version, you can print 9960 finished products; B product layout should fight 20 small version, just can print 8300 finished products; C The layout of the product is combined with 16 small editions, which can print 6,640 finished products and 140 finished products. Among them, there are 140 finished products of type A, so 140÷24=5.8. This way, it is enough to increase the number of large sheets of paper by six, that is, the actual number of printed sheets of folio paper should be 421 sheets ( No additional loss rate should be added). Then, 421 × 60 = 25,260 sheets of finished products, totaling 24,900 sheets of finished products of 3 kinds, 360 sheets (120 sheets of paper), and 3 sheets of full-open sheets. It can be seen that the use of paper for printing is the most provincial. With a set of release editions, the printing of three kinds of products can be completed, which saves time and labor and saves raw material and equipment consumables. With reference to the above formula, it is also possible to quickly calculate the number of finished impositions and the number of large sheets of paper with different print numbers, different varieties, and the same paper.
If there are 8 varieties of trademarks (front and back four-color printing, positive and negative graphics are different), the number of finished products are: 2,100 finished A products, 4000 finished B products, and 13,000 finished C products. There are 5,200 finished products, 26,000 finished E products, 33,500 F finished products, 44,000 finished G products, and 11,000 finished H products. The characteristics of this series of trademark products are that they have many varieties and a large number of print sizes. Finished product specifications fight 64 small editions, just happens to be generous folio equipment supplies. In order to save plate material and plate man-hours, it is only necessary to make a set of open editions. In this way, although it is possible to print more finished products of individual varieties, it is more cost-effective to make a set of split editions according to the above formula. Calculate the number of prints of folio = total number of finished products of 8 varieties (138800), and the total number of impositions on the half-cut surface (64) = 2169 sheets (print number of large sheets of paper). The number of impositions of each of the 8 products = the number of finished products of each small version. The number of prints of folios (2169 sheets) of equipment consumables.
In this way, A=2100÷2169=0.97 small editions, B=4000÷2169=1.8 small editions, C=13000÷2169=6 small editions, D=5200÷2169=2.4 small editions, E=26000÷ 2169=12 small editions, F=33500÷2169=15.4 small editions, G=44000÷2169=20.3 minor editions, H=11000÷2169=5.1 small editions.
From the calculation results, it can be seen that the layout of the A product on the split board surface can be printed in one small version, 2169 sheets can be printed, and 69 pieces of finished products can be produced; the layout of the B products can be combined in 2 smaller versions, and 4338 sheets can be printed. Finished products, 338 more finished products; C product layout fight 6 small version, can print 13014 finished products, 14 more finished products; D product layout fight 3 small version, can print 6507 finished products, more 1307 finished products; 12 kinds of small editions of the E-type products can be printed, 26,280 finished products can be printed, and 28 more finished products; F version of the products can be printed in 15 small editions, 32,535 finished products can be printed, and 965 finished products can be eliminated. Then, 965÷15=64.3, the number of imprints of large sheets needs to be increased by 65; the layout of G-type products is combined with 20 small-scale versions, 43380 sheets of finished products can be printed, 620 sheets of finished products are missing, and the number of imprints of large sheets of paper needs to increase. 31 sheets; 5 kinds of layouts for H-type products are combined to print 10,845 finished products, 155 finished products are missing, and the number of large sheets of paper needs to be increased by 31. From the calculation results of the cited formula, it can be seen that the number of F finished products is the largest, and the number of large sheets of paper 65 sheets needs to be increased. Thus, the actual number of printed sheets of printed sheets should be 2169+65=2234 sheets. Thus, the printed products are printed. The total number is 142976, which is 4176 more than the actual total number of 8 kinds of finished products, equivalent to 33 sheets of full-open paper. In this way, it is necessary to use 33 full-opening papers to print 8 sets of split prints, which is even more cost-effective than the number of sets used to make printing plates.
From the results of the above two cases, it can be seen that the closer a certain number of finished products are to multiples of open sheets, the more accurate the total number of sheets. Therefore, if there is a big difference between a certain number of finished products and a multiple of the number of large sheets of paper, and the number of impositions is smaller, the number of large sheets of paper needs to be increased. If the paper materials are more expensive and the quantity added is excessive, if it exceeds the value of the printing plate and other costs, it may be appropriate to increase the number of sets of printing plates so that the number of prints does not exceed the quantity of the actual finished goods. Another example: there are five types of finished product printing quantities: 500 for A, 1 for B, 50,000 for C, 80,000 for D, and 120,000 for E. This series of products (2-color version) has the same printing material, and is printed in four-fold paper format. The layout can be used for 16 small-size products.
If there is a large difference in the number of finished products like this, and the number of impositions is small, if a set of four-up editions is printed together, then the total number of 5 kinds of finished products is 265500÷16=16594 sheets (four sheets of paper stamps). , A kind of fight a version, print out more 16094 finished products, equivalent to 251 full-opening paper; if the split print, 265500 ÷ 32 = 8297, A kind of fight a version, much more printing Out of 7,797 finished products, equivalent to 122 full-opening papers; B species to fight 2 editions, much more to print 18,188 finished products, equivalent to 284 full-opening paper; C species to fight 6 editions, 49782 can be printed, 218 less Finished products, need to add 37 pieces of folio paper; D species fight 9 versions, 74574 printable, 5327 less finished products, 592 folios need to be added; 14 species E-splash, 116158 printable Finished products, 3842 fewer finished products, need to add 275 folio. Then, 8297+592=8889, the actual number of products printed was 284,448, 18948 more than 265,500, equivalent to 296 sheets of full-open paper. If it is a high-grade, expensive material, the amount of paper used for the above two kinds of imposition printing The value may exceed the value of the equipment consumables used to increase the production of plates. If it is divided into two sets of prints for printing, A and B can be combined together to create a set of four open-edition; C, D and F three kinds of spelling a pair of open printing.
In accordance with this, the first edition A, B = 15500 ÷ 16 = 969 (four open prints), A species of a small version of the finished product quantity is 969, B species of 15 small pieces of the finished product is 14,535 , 465 less, the number of large sheets of paper need to increase the number of 31, so that the actual number of four printing paper should be 1,000, the number of multi-purpose paper equivalent to 8 full open paper.
The second edition C, D, E = 250000 ÷ 32 = 7813, C species fight 7 small editions can print 54691, more finished products 4691, D species fight 10 small editions can print 78130, finished products less 1870 Zhang, then, the number of imprints of large sheets of paper needs to be increased by 187 sheets; E-fifteen small sheets can print 117,195 sheets, and the number of finished products is 2,805. Then, 2805÷15=187 sheets, it also needs to add 187 sheets of folio paper. Therefore, the actual number of folio prints should be: 7813 +187 = 8000 material prices. 8000 × 32 = 256,000 sheets (total number of finished products), the total number of finished products more than 6000, then, 6000 ÷ 64 = 93 sheets, divided into two sets of printing plates for printing, more than 101 full-open paper, less than the production of a set of half-split version with 195 full-open Based on the above calculation results, paper can be comprehensively analyzed and considered in terms of material value, equipment utilization, and number of prints, and a relatively cost-effective print imposition plan can be selected so that the production efficiency and the use of raw materials are better. Take into consideration.
In summary, using the formula method to accurately and quickly determine the print imposition plan can make the arrangement of the prepress technology reach relatively scientific and reasonable results. It can be said that the correct imposition can not only effectively reduce material waste, but also reduce the time for loading and printing, and improve the utilization of the machine. This is an objective reality that has been proved for printing process practice.
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