Section method of signature
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There are two kinds of printing methods for the printing of signatures. One is that when printing sheets are printed on the front and back sides, there is no need to replace the printing plates. The method of directly printing the positive and negative sides is called pirated printing, such as the 16-page printing sheet. Pay (replica) the sample map on the 4th page 2 to print. The second is that the printed sheet needs to be replaced after printing one side, and then the other side can be printed, which is called the set printing, such as the 25-page signature (set) example of each side of the printed sheet.
According to the type of signature, from the printing page in the order of the number of pages, the front or back of the signature printing is decomposed, and a working process of each printing plate is called a division. The division is an important process before the signature version (or imposition, or imposition).
The division can be divided into three categories:
One is the division of even-numbered signatures: such as 2, 4, 6, 8, 16 pages and other signatures;
The second is the division of odd-numbered signatures: such as 1, 3, 5 pages and other signatures;
The third is the division of mixed signatures: 6 pages long, 9 pages long, 10 pages long and so on.
The principle of the number of axes is used to express the regularity of the version. The principle column of the even number of signatures in the schematic diagram is the point on the number axis. After decomposition, it is transferred to the front (+) page of the signature, and On the reverse (-) page of the signature, if the front and back page numbers are formed, the points obtained are the solutions, that is, the page numbers of the signatures. The "division principle" in the table indicates the commonality of each signature division, and the "code sequence decomposition" column specifically indicates the personality of a signature division, which shows which page numbers are printed on the front side of the signature, the book What are the page numbers of the reverse side of the post?
The concept of taking points on the number axis and the classification features of various types of signatures will be discussed one by one in the following.
This article stipulates that the face of the first and last codes in the signature (or printed) is called the front side, and the other side opposite is called the reverse side, which is marked with the symbols "+" and "-" respectively.