Quickly determine the scheme of imposition
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In the printing process, we often use the same material, the same size of the printing format, printing a number of different types of small-sized printed products with different layouts or specifications, which is how to carry out the pre-press imposition process. Scientific and rational process design issues are also related to whether it can improve the production efficiency of enterprises and save raw materials. According to the experience of production process management, it is of great significance to improve the pre-press process scheduling technology, improve the utilization rate of production equipment, fully utilize and save valuable printing materials, and reduce printing production costs.
When printing trademarks, labels, tickets or other products of different quantities and different types of layouts, the combination printing on the same printing surface can save the printing materials on the one hand, and can effectively reduce the loading on the other hand. The edition, the school working hours, and the consumption of paper and printing plates greatly improve economic efficiency. For example, if the four-color offset printing machine is to print a four-color label product with the same paper and the same finished product specifications, their varieties (different layouts) and the number of finished products are different. Among them, 10 kinds of A products are printed, and B products are 8300 sheets were printed, and 6,500 sheets of C products were printed, a total of 3 varieties. This series of products is printed on a paper with a split size and can be combined for 60 small prints (in accordance with the specifications of the finished product) for combined printing. Then, like this kind of products with different finished layouts and different sizes, the three kinds of products can be printed on the same plane. Only one set of four-color version can be used to complete the printing. Then, how to determine the number of impositions of A, B, and C products? First, the actual number of printed sheets of the open specification sheet must be calculated. The calculation formula should be: the number of printed sheets of the open paper (excluding the loss rate) = the total number of finished products of the three varieties (24,900 sheets), the total number of impositions on the opposite layout. Number (60 small versions) = 415 sheets (number of printed sheets of folio). The number of impositions of each of the three products = the number of copies of each small version of the number of copies of the paper (415). That is: A=10100÷415=24.3 small editions; B=8300÷415=20 small editions; C=6500÷415=15.7 small editions. It can be seen from the calculation results that 24 small editions of A products can be printed on the opposite layout, and 9960 finished products can be printed; the layout of B products should be spelled 20 small editions, which can just print 8300 finished products; The layout of the products is 16 small versions, which can print 6640 finished products and 140 finished products. Among them, 140 kinds of finished products are less, then 140÷24=5.8, so it is enough to increase the number of printed sheets of large sheets by 6 sheets. That is to say, the actual number of printed sheets should be 421 sheets ( Does not contain additional loss rate). Then, 421 × 60 = 25,260 finished products, 24,900 more than the total of 3 kinds of finished products, 360 more (120 open paper), equivalent to 3 full-open paper. It can be seen that printing with a set of plates is the most economical. The printing of three kinds of products can be completed by using a pair of facing versions, which saves time and labor and saves raw materials.
Referring to the above formula, it is also possible to quickly calculate the number of finished impositions of various printings, different varieties, and the same paper, and the number of printing of large sheets of paper. If there are 8 varieties of trademarks (four colors of positive and negative prints, the positive and negative images are different), the number of finished products is: 2100 kinds of finished products, 4000 kinds of finished products, 13,000 pieces of finished products, D There are 5,200 finished products, 26,000 finished products, 33,500 finished products, 44,000 finished products, and 11,000 finished products. The characteristics of this series of trademark products are that they have many varieties and large print sizes. The finished product specification is 64 small versions, which is exactly the big paper. In order to save the printing plate material and the plate-making time, it is only necessary to make a set of facing editions. In this way, although the finished products of individual varieties can be printed more, it is more cost-effective than making a set of facing editions. Calculation, the number of printed papers on the folio = the total number of finished products of 8 varieties (138,800) 总 The total number of impositions on the opposite layout (64) = 2,169 sheets (the number of printed sheets of large sheets). The number of impositions of each of the 8 products = the number of finished copies of each small version of the paper (2,169 sheets). Thus, A=2100÷2169=0.97 small version, B=4000÷2169=1.8 small version, C=13000÷2169=6 small versions, D=5200÷2169=2.4 small version, E=26000÷ 2169=12 small editions, F=33500÷2169=15.4 small editions, G=44000÷2169=20.3 small editions, H=11000÷2169=5.1 small editions. It can be seen from the calculation results that a small version of the A product on the opposite page can be printed with 2,169 sheets and 69 more finished products; the layout of the B products can be printed in 2 small versions, and 4,338 sheets can be printed. Finished products, 338 more finished products; C products have 6 small versions of the layout, can print 13014 finished products, and 14 more finished products; D products can be printed in 3 small versions, can print 6507 finished products, more 1307 finished products; the layout of E products is 12 small editions, which can print 26,028 finished products and 28 more finished products; the F products can be printed in 15 small editions, which can print 32,535 finished products and 965 finished products. Then, 965÷15=64.3, the number of prints of large sheets of paper needs to be increased by 65; the layout of G kinds of products is 20 small editions, which can print 43380 finished products, 620 finished products, and the number of printed sheets of large sheets needs to be increased. 31 sheets; the layout of H products is 5 small editions, which can print 10,845 finished products, 155 finished products, and 31 large prints. It can be seen from the calculation results of the cited formula that the F type of finished product is the most, and it is necessary to increase the number of printing of 65 sheets of large sheets of paper. Thus, the actual number of printed sheets of the paper should be 2169+65=2234 sheets, so that the total number of printed products is The number is 142,976, which is 4176 more than the actual combined count of 8 finished products, equivalent to 33 sheets of full-open paper. In this way, the eight varieties are combined to print a pair of open editions, and only 33 full-open papers can be used, which is more cost-effective than the number of sets of printing plates. From the results of the above two cases, it can be seen that the closer the number of finished products is to the multiple of the open sheets, the more accurate the total amount of paper is. Therefore, if the number of certain finished products differs greatly from the multiple of the large number of printed sheets, and the number of impositions is smaller, the number of large sheets of paper needs to be increased. If the paper material is more expensive and the amount of the paper is too large, which exceeds the value of the printing plate and other costs, consider increasing the number of sets of printing plates so that the number of printing does not exceed the actual number of finished products. Another example: the number of finished products printed in five kinds of products is: 500 for A, 15,000 for B, 50,000 for C, 80,000 for D, and 120,000 for E. The series of products (2-color version) have the same printed materials and are printed on four-paper format. The layout can be used to match 16 small versions of finished products. If the number of finished products differs greatly, and the number of impositions is small, if a set of four open editions is printed, then the total count of the five finished products is 265,500 ÷ 16 = 16,594 (four open paper prints). A type of spelling a version, it is much printed out 16094 pieces of finished products, equivalent to 251 pieces of full-open paper; if the combination of the open version of the printing, then 265500 ÷ 32 = 8297 sheets, A kind of spell 1 version, much more printing Out of 7,797 finished products, equivalent to 122 pieces of full-open paper; B kinds of 2 pieces, more printed 18,188 finished products, equivalent to 284 full-open paper; C kinds of 6 pieces, can print 49,782, less 218 For the finished product, 37 sheets of folio paper should be added; for D type, 9 editions can be printed, 74,637 sheets can be printed, and 5,327 finished products are lost. The number of papers to be printed must be increased by 592; for E type, 14 editions can be printed, 116,158 sheets can be printed. Finished products, 3,842 finished products are missing, and 275 sheets of folio are added.
Then, 8297+592=8889, the actual number of products printed is 284,448, more than 265,500 printed 18,948, equivalent to 296 full-open paper, if it is high-grade, expensive materials, the amount of paper used in the above two imposition printing The value may exceed the value of increasing the production of plates. If you print two sets of plates for printing, you can combine A and B into a four-open version; C, D and F are combined to print a pair of open versions. According to this imposition, the first set of A, B = 15500 ÷ 16 = 969 (four open prints), A type of a small version of the finished product is 969, B type of 15 small version of the finished product is 14,535 There are 465 fewer sheets, and the number of printed sheets of large sheets needs to be increased by 31. Thus, the actual number of printed sheets of four sheets of paper should be 1000 sheets, and the number of sheets of multi-purpose paper is equivalent to 8 sheets of full-open sheets. The second set of C, D, E = 250000 ÷ 32 = 7813 sheets, C kinds of spells 7 small editions can print 54691 sheets, more than 4,691 finished products, D kinds of spells 10 small editions can print 78,130 sheets, less than 1870 finished products Zhang, then, the number of large sheets of paper needs to be increased by 187; E spells 15 small prints can be printed 117,195, and finished products are less than 2,805, then, 2,805, 15 = 187, and 187 sheets of paper need to be added. Therefore, the actual number of printed papers should be: 7813+187=8000 sheets. 8000×32=256000 sheets (total number of finished products), the total number of finished products is 6,000 sheets, then, 6000÷64=93 sheets, which are divided into two sets of printing plates for printing, and 101 sheets of all-open paper are used, which is less than 195 sheets for making a set of facing editions. According to the above calculation results, paper can comprehensively analyze and consider the material value, equipment utilization and printing number, and choose a relatively cost-effective printing imposition scheme to make the production efficiency and raw material utilization better. Take care of both.
In summary, using the formula method to accurately and quickly determine the printing imposition scheme can make the pre-press process layout relatively relatively scientific and reasonable results. It can be said that correct imposition can not only effectively reduce material waste, but also reduce the time of plate loading and proofing, and better improve the utilization rate of the machine. This is an objective actual situation proved by the printing process practice.