For the size of the paper, paper production department according to the national standard production of paper called the full paper, put a piece of paper cut open or folded into a plurality of equal area called Zhang, how much the number of bound, how much is the format. Various sizes of specifications, the national unified standards, so printed books throughout the country, the same specifications are the same size.
Due to the size of various specifications of the paper size is not the same, although all cut into the same number of open, the size of the specifications are not the same, after the book, such as the amount of the book is not exactly defined. At present our country's 787*1092 (mm) as a standard sheet of paper, use it to print 32 open book, called 32 folio. If 850*1168 (mm) paper is printed into 32 open book, because the paper width is larger than the standard printing, it is necessary to crown a "big" word, called "big 32".
The choice of the format is generally determined by the nature of the book, the number of pages, the level of the reader, the use of conditions and other factors, there is no hard and fast rules. Books and periodicals format, most of the geometric series 2 to cut, so that in the binding machine folding. The more common format is 16, 32, 64 format, the most commonly used is the 32 format.
The method of geometric progression of the 2 which is started at the beginning of the length is also the basic open method, that is, the direct opening method. In accordance with the geometric series of 2 open cut, you can also start in the width of the lower knife, which is called the transverse opening method.
Cross with little open method, only some of the cover, inserts and special printing paper, using this open method.
In order to publish the special needs, the geometric series of non geometric series is used, such as 12 open, 18 open, 20 open, 24 open, 28 open, 36 open, etc.. This deformity cannot use machine folding, cutting is trouble, when binding to hand operation, prone to error, so the general books, especially print more books, rarely used. There are three opening methods, five opening methods, seven opening methods and so on.
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