In the printing pricing work of the printing company, the cost of paper accounts for a considerable proportion in the cost of printed matter, and the calculation of the amount of paper used and the amount of paper are particularly important. The single page includes ordinary single pages (promotional pages, property market advertisements, commodity price lists, postal advertisements, etc.) and special single pages (books, magazine covers and inserts, etc.). Based on many years of printing pricing teaching practice, combined with the printing company's pricing practice, let's talk about the calculation of the amount of paper used for printing a single page of a sheet-fed offset printing machine and the amount of paper.
1 Paper consumption calculation
In the actual work of printing a single page by a sheet-fed offset press, the paper consumption includes the paper consumption (theoretical paper consumption) calculated from the actual number of printed products, and the adjustment of registration, ink-water balance, color, A small portion of paper wasted such as printing pressure, and a portion of paper wasted in debugging equipment after printing. Therefore, the amount of paper used = theoretical paper amount + plus volume.
1) Theoretical paper consumption (unit: order)
The theoretical paper consumption is the paper consumption calculated based on the actual number of printed products, not the paper consumption in the actual printing process.
Theoretical paper volume = single page quantity / (single page opening number × 500)
2) In the actual printing production process, a small part of the paper is wasted due to the adjustment of registration, water and ink balance, color, printing pressure, etc., and a part of the single pages (inserts, covers, etc.) are wasted in the post-press processing of debugging equipment ). Therefore, the total addition amount = printing addition amount + binding addition amount.
①Printing and printing volume Printing and printing volume = (number of prints per edition × printing and loading rate × number of printing plates) / (number of paper sheets on machine × 500)
Printing plus release rate:
? Each printing plate is less than 3000 prints, and about 30 to 50 sheets of paper are added to each version (the same as the paper size used on the machine);
? Each printing plate exceeds 3000 prints, and the release rate of each plate is about 5 ‰ ~ 10 ‰, the amount is greatly reduced, but not less than 3000 prints.
②Stapling plus volume Stapling plus volume = (number of copies × stapling plus release rate × number of single pages per volume) / (open number of single pages × 500)
Binding and loading rate:
? The single-page binding plus release rate is generally 5 ‰ ~ 15 ‰, the amount is greatly reduced;
? The number of installed 2000 volumes, less than 2000 volumes are counted as 2000 volumes.
Regarding the specific values ​​of printing increase rate and binding increase rate, different regions and different printing companies will set according to the actual situation of the region and the unit. Ordinary single pages (promotional pages, property market advertisements, commodity price lists, postal advertisements, etc.) only consider paper wasted in the printing process; special single pages (books, magazine covers and inserts, etc.) should consider the waste paper in the printing process In addition, we must consider the single page wasted in the binding process.
2 Paper calculation
1) The formula unit price of each full-open paper = full-open paper area × (quantity / 100) × (ton price / 10000)
Area unit: square meters of paper = unit price of each full-open paper × order number × 500
2) Common paper area 787mm × 1092mm: 0.86m2 (positive paper)
850mm × 1168mm: 1.0m2
880mm × 1230mm: 1.08m2
889mm × 1194mm: 1.06m2
841mm × 1189mm: 1.0m2
1000mm × 1414mm: 1.4m2
In the actual printing pricing practice, the calculation of the amount of paper used for printing a single sheet of offset paper and the amount of paper also need to consider the relationship between the size of the finished product and the paper used on the machine, the cutting edge size, the relationship between the direction of the paper thread and the printing machine, etc. . The calculation of paper consumption and paper payment is more complicated. Only the basic principles of paper consumption and paper calculation are discussed here.
3 Bylaws
16-fold manual, 128-sided text draft (with 70 grams of double-sided adhesive paper), 4-sided color insert (double-sided color 4 + 4), 24,000 copies; use 4-fold 4-color sheet-fed offset printing machine for printing, Others are not considered for now ; Assumption: the amount of printing plus release is less than 3000 prints per plate, and about 40 copies are added per plate, and each print plate exceeds 3000 prints, and the release rate of each version is about 5 ‰; the rate of binding plus release is 10 ‰; color insert With 80 grams of double copper, 8000 yuan / ton. How much is the paper money required for color inserts?
According to the meaning of the question:
1 Paper volume 1) Theoretical paper volume Theoretical paper volume = number of single pages / (open number of single pages × 500) = 24000 × 2 / (16 × 500) = 6 (order)
2) Add volume ①Print plus volume 1/16 × 4 = 1/4, then 48000/4 = 12000 sheets (four-sheet paper), 4 printing plates are needed for flexographic printing, and 12,000 sheets are printed on the front of each folio 12,000 sheets 12,000 stamps on the reverse side, 24,000 stamps on the reverse side, and over 3,000 stamps per edition, with a release rate of 5 ‰.
Printing plus release volume = (number of prints per edition × print plus release rate × number of printing plates) / (number of paper on the machine × 500) = (24000 × 5 ‰ × 4) / (4 × 500) = 0.24 (order)
②Stapling and adding volume Stapling and adding volume = (number of copies × binding plus unloading rate × number of single pages per volume) / (open number of single pages × 500) = (24000 × 10 ‰ × 2) / (16 × 500) = 0.06 ( make)
â‘¢Total release volume Total release volume = Printing volume plus volume + Binding volume plus volume = 0.24 + 0.06 = 0.3 (order)
3) Total paper consumption Total paper consumption = theoretical paper consumption + additional discharge = 6 + 0.3 = 6.3 (order)
2 The paper size is 16 open, indicating the use of positive paper, the full open area is 0.86m2, so 1) the unit price of each positive paper unit price per sheet = paper area × (quantity / 100) × (ton price / 10000) = 0.86 × (80/100) × (8000/10000) = 0.86 × 0.8 × 0.8 = 0.55 (yuan)
2) Paper moneyPaper money = unit price per paper × order number × 500 = 0.55 × 6.3 × 500 = 17325 (yuan)
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