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The method for adjusting the paper loading rate of the Beijing area book printing and printing factory, which was formulated by the State Press and Publication Administration (which can be found in the printing price book in Beijing in 1996), is the basis for the settlement of paper between the publishing houses and the printing houses. The third and fourth tables of the method are the offset printing platform (book version) and the color printing plus rate. The first item of the two tables is that the printing and loading are less than 60 per color, and 60 sheets are counted.
The 60 sheets specified in this annotation are an absolute number. The number of positive papers is calculated by the number of copies of the number of papers used by the printed personnel, and then multiplied by the rate of addition. The formula is the number of books. ×Printing ×addition rate = increase the number of papers. According to this, it is known that only the known conditions on the left side of the equal sign can not immediately and intuitively determine whether the number of papers on the right side of the equal sign is less than 60. If you want to determine, you must perform a trial operation, which increases the workload. It is more troublesome. If it is multi-line printing, it is more troublesome, and it is not easy to reach a consensus between the publisher and the printing house.
In order to solve this problem intuitively, we propose the following simplified method for reference only.
(1) Define the customer order number of a product as the number of books.
(2) The quantity printed by the product on the printing press is defined as the number of impressions. For single-printed products, the number of books and the number of prints are the same, and the number of copies in multiple-printing is a multiple of the number of prints.
(3) Assuming that the printing machine prints a single product, under what conditions is the number of papers to be placed 60?
According to the calculation formula of the number of papers to be fed, the yield (printing number × 1 printed sheet) × the rate of addition and release can be obtained. According to the provisions of Table 3 and Table 4, the rate of addition and release is 0.9%, then there are printing numbers × 0.9% = 60 sheets, the number of prints =60/0.9%=6667.
Therefore, 6667 is the number of prints when the number of additions is exactly 60, and the following conclusions can be drawn accordingly.
When the number of prints is less than or equal to 6667, each color is added and placed at 60 sheets.
When the number of prints is greater than 6667, the print rate can be multiplied directly by the print rate.
(4) In the case of single printing, the number of copies is the number of prints. According to the two conclusions in (3), the method of calculating the number of added and released can be determined. If it is multi-printing, it is also very simple. Simply divide the number of books by the number of joints, compare the number with 6667, and then follow the conclusion in (3) to determine the calculation method.
(5) In the actual calculation, the unit of measurement of "Zhang" of 60 sheets does not necessarily mean an original unsized paper, but the paper size actually used when the printing press is printed, such as six open and four. Open, three open, split, fully open, etc., the corresponding actual number of sheets should be (for a pair of open).
Six open: 60/(6/2)=20 square
Four open: 60/(4/2)=30 square
Three open: 60/(3/2)=40 square
Off: 60/(2/2)=60
Fully open: 60/(1/2)=120 square
(6) The calculation of zero-printing requires two concepts to be clarified.
The first is to publish a printed sheet, which is the number of printed sheets we see on the copyright page of the book, such as 1.125, 1.25, 1.375, 1.5, 10.75, 8.75, etc. Any sheet of less than 1 is collectively referred to as a zero sheet.
The second is to install (upper) version of the printed sheet, which means that the printing machine is installed several times. The number of printed sheets can only be greater than the number of printed zero sheets. For example, 0.5, 0.25, 0.125 and other zero sheets are one sheet, and 0.375 and 0.625 respectively. 0.75 needs to be divided into 0.1250.25, 0.1250.5, 0.250.5, twice installed, so they are two loaded plates, 0.875 is divided into 0.1250.250.5 three loaded plates, so it is 3 loaded plates. .
The difference between these two concepts is also directly related to the calculation of the number of prints in the printing price and the number of printing times.
Example
The following example calculates the amount of offset paper loaded and discharged.
(1) Cover, eight open, four colors, print 50,000, four prints on the boot. Then 50,000 / 4 = 125,000, greater than 6667, according to normal loading and unloading, 12500 × 4 (color) × 0.9% = 450 square.
(2) Advertising, 12 open, 4 colors, 15,000 printed, 4 boot triple print. Then 15,000 / 3 = 0.5 million, less than 6667, calculated by 60 sheets, 60 / (4 / 2) × 4 colors = 120 square.
(3) The zero-print of a book is 0.875, the number of prints is 16,000, and the double-sided printing. The 0.875 is divided into 0.5, 0.25, and 0.125 sheets, and the calculated sheets are calculated to be 16000×0.5=8000, which is greater than 6667, and 8000×0.9%×2 faces=144 squares, 16000×0.25 and 16000×0.125, and the number is less than 6667. According to 60 sheets, 60 × 2 (face) × 2 (secondary version) = 240 squares.