The basic unit of measurement for sheetfed sheets is sheets, orders, pieces, tons, which are commonly used in calculating paper usage. Quantify the same 500 sheets of full sheet of paper for 1 order. Since paper is usually quoted in weight (ie, yuan/ton), it is necessary to convert 1 ton of paper into corresponding orders, which can be calculated by quantification and weight. The basis weight is the weight per square meter of paper. The weight is the actual weight of the paper. The weight of each paper and the number of papers per ton can be calculated by the following formula.
Weight (kg) = quantitative (g / m2) × length of paper (m) × width of paper (m) × 500 ÷ 1000 tons of paper orders = 1000 ÷ weight (kg) Currently, the most used single in the printing industry The sheet size includes 787 mm × 1092 mm, 850 mm × 1168 mm, 880 mm × 1230 mm, and 889 mm × 1194 mm. Taking a sheet of paper having a basis weight of 75 g/m 2 and a size of 787 mm × 1092 mm as an example, the weight is: 75 × 0.787 × 1.092 × 500 ÷ 1000 ≈ 32.23 kg; the number of tons of paper is: 1000 ÷ 32.23 ≈ 31.03.
After understanding the above basic measurement method, we calculate the amount of paper for the bill printing . Ticket printing is generally for joint printing. There are usually two, three, four or even more. Each time only one of the printing papers needs to be calculated, and then multiplied by the number of papers to obtain the total paper amount. Calculation process and method.
(1) Determine the specification and opening number of the bill paper. According to the standard specifications, the opening number can be determined directly according to the size (check table method); if the ticket printed by the customer committee is a non-standard size, the length and width of the applied full-open paper divided by the length and width of the printed matter will be respectively The result is rounded up (after the decimal point is omitted) and multiplied, the maximum number of products obtained is the open number, in which case the effective utilization of printed paper is highest. For example, the customer's finished product size is 230mm × 200mm, taking the large (1194mm × 889mm) and positive (1092mm × 787mm) full sheet as an example, the opening count is as follows:
Large sheet of paper:
1194÷230≈5.19889÷200≈4.45
5×4=20——20 open
889÷230≈3.871194÷200≈5.97
3×5=15——15 open
Positive full sheet:
1092÷230≈4.75787÷200≈3.94
4×3=12——12 open
787÷230≈3.421092÷200≈5.46
3×5=15——15 open
Comparing the above calculation results, it is known that the large-size full-sheet paper of 889 mm×1194 mm size can be used for 20-open printing, and the positive full-sheet paper of 787 mm×1092 mm size can be used for 15-open printing, and the paper utilization ratio of the two specifications can be further calculated and compared:
(230×200×20)÷(889×1194)≈86.67%
(230×200×15)÷(787×1092)≈80.29%
It can be seen that the utilization rate of the 889mm×1194mm large-size full-sheet paper is higher, so this example should be printed on a large sheet of paper.
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