The order of the signatures in the folding is called the folding sequence. The folding of the signatures is to seek as few folding sequences as possible, which saves time and labor and is beneficial to printing.

There are generally three rules to follow for folding and folding order of signatures:

1. Fold odd to even: For a post composed of odd rows (or columns) *, the first fold should be folded into an overlapping even row (or column), and then "overlap and fold" one or more times respectively Into a signature. Among them, there are 8 types of odd-numbered rows and columns, including 3 pages in straight and horizontal styles, 5 pages in straight and horizontal styles, 6 pages in square, 6 pages in length, 9 pages in length, and 10 pages in length.

2. Overlap and Fold: For a signature consisting of an even number of rows (or columns), the first fold is "overlap and fold", which can be completed only after one or more corners and overlap and fold. Among them, there are 8 kinds of even-numbered rows and columns of signatures, such as straight and horizontal 2 pages, straight and horizontal 4 pages, square 4 pages, square 8 pages, length 8 pages, square 16 pages.

3. The fixed point of the folding position: folding requirements: first, the page number and the page code word overlap and align, and the whole book line-to-line and code pair code are overlapped and added, and the second is the straight edge of the book end and the horizontal book The inner edge of Theraqi is the same as the standard position of the signature. This is the rule of "fixed position" when folding.

Hand-folded signatures can't be folded into reversed signatures, but machine-folded signatures are done by mechanical action, so it is allowed to reverse the folded signatures.

In order to facilitate the binding process, in addition to the horizontal signature, the two inner spaces (stitching) of the outermost layer of the signature are connected, and the other pages are sandwiched and overlapped, so that the rope can be fastened and bound into a book, such as the first See A in the figure on page 56.

In this article, we will conduct an in-depth discussion and a more comprehensive introduction to sixteen typical signatures of universal significance. The attributes of various signatures are described in Chapter 11 and are produced and developed on the basis of hand-folded signatures. Machine folding book signature.

* We agree on the post: horizontal is called rows, and vertical is called columns.

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