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The calculation method of offset paper addition

the adjustment method of the paper addition rate of Beijing book and periodical printing plants (which can be found in the 1996 Beijing printing price book) made by the General Administration of publishing, which makes the price of recycled particles rise accordingly, is the basis for the settlement of paper between publishing houses and printing plants. The third and fourth tables of the method are offset printing platform (Book Edition) and color printing amplification rate. The first content of the notes of these two tables is that if the printing amplification rate is less than 60 sheets per color, it is calculated as 60 sheets

the 60 sheets specified in this note is an absolute number, which is calculated by the printing personnel according to the known data such as the number of copies and the number of openings, and then multiplied by the addition rate. The formula is the number of copies x the addition rate of the printed sheet two plus the number of papers. It can be seen from this that only knowing the known conditions on the left side of the equal sign can not immediately and intuitively judge whether the number of papers added on the right side of the equal sign is less than 60. If you want to determine, you must carry out trial operation, which increases the workload and is more troublesome. If it is multi copy printing, it is even more troublesome, and it is not easy to reach a consensus between the publishing house and the printing factory

in order to solve this problem intuitively, we propose the following simple calculation method for reference only

(1) define the customer order number of a product as the number of copies

(2) define the quantity of the product printed by the printing machine as the number of prints. For all products printed in a single copy, the number of copies and the number of prints are the same. When printing in multiple copies, the number of copies is a multiple of the number of prints

(3) assuming that the printing machine prints single copy products, under what conditions is the number of additional sheets of paper 60

according to the calculation formula of the number of papers added and put, the (number of prints x sheets) adding and putting rate can be obtained. According to table 3 and table 4, the adding and putting rate is 0.day%, then there are 0, 9% =60 sheets of prints, and the number of prints =60/0.9% =6667

therefore, 6667 is the number of prints when the number of prints is 60. Based on this, the following conclusions can be drawn:

① when the number of prints is less than or equal to 6667, 5. Experimental force measurement accuracy: 1% of each color is 60

② when the number of prints is greater than 6667, the number of prints can be directly multiplied by the amplification rate

(4) when printing a single copy, the number of copies is the number of copies. According to the two conclusions in article (3), the method of calculating the number of additions can be determined. If it is multi copy printing, it is also very simple. Just divide the number of copies by the number of copies, compare the number with 6667, and then determine the calculation method according to the conclusion in article (3)

(5) in actual calculation, the unit of measurement of 60 sheets does not necessarily refer to a piece of uncut original size paper, but refers to the actual paper size used in printing by the printing machine, such as six opening, four opening, three opening, half opening, full opening, etc., and the corresponding actual number of sheets should be (square is a pair of sheets)

six opening: 60/(6/2) =20 square

four opening: 60/(4/2) =30 square

three opening: 60/(3/2) =40 square

opposite opening: 60/(2/2) =60 square

full opening: 60/(1/2) two 120 square

(6) two concepts need to be clear about the calculation of zero print

first, the number of printed sheets published, that 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 and other printing sheets, all printing sheets less than 1 are called zero printing sheets

the second is to install (top) the printing sheet, which means that the printing machine has installed several times, and the number of zero printing sheets installed can only be greater than the number of zero printing sheets published, such as 0.5, 0.25, 0.125, etc. zero printing sheets are one printing sheet respectively, while 0.375, 0.625, 0.7 experimental range automatic impact free conversion 5 needs to be divided into 0.125+0.25, 0.125+0.5, 0.25+0.5 respectively. Two printing sheets are installed, so 0.875 needs to be divided into 0.125+0.25+0.5 three printing sheets, Therefore, there are three plate printing sheets. The difference between these two concepts is also directly related to the calculation of the number of prints and the number of printing times (sets) in the king price of printing

the following example is used to calculate the dosage of offset paper

(1) cover, octave, 4 colors, 50000 prints, quadruplicate printing for startup. Then 50000/4; 12500, greater than 6667, and adjusted according to the accurate selection of normal and convenient detection points; The test space is greatly enlarged, 12500 4 (color) 0.9%=450 square meters

(2) advertising, 12 Kai, 4 colors, 15000 prints, 4 power on triplicate printing. Then 15000/3 = 5000, less than 6667, calculated as 60 sheets, 60/(4/2) 4 colors =120 square meters

(3) the zero print sheet of a book is 0.875, the number of prints is 16000, and it is printed on both sides. Divide 0.875 into 0.5, 0.25 and 0.125. Calculate 16000 0.5=8000, greater than 6667, using 8000 0.9% 2 sides =144 square meters, 16000 0.25 and 16000.125, and the numbers are all less than 6667. Calculated by 60 sheets, 602 (sides) 2 (secondary version) =240 square meters

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