How to arrange non-full-printed signatures
Perhaps we pay attention to the page number of a book, its format, folding method, and its book-forming process, but we rarely think about how many full sheets of paper it is composed of, and how its page numbers are arranged. When you think about it, determining the page number of the book is related to printing, and it is the premise of the entire process. With it, we know how to print, print, bind, and complete a book.
We know that a single sheet is printed once on one side of a full sheet of paper or once on each side of folio. A book consists of multiple printed sheets, and a printed sheet can print multiple page numbers according to different formats. If a printed sheet is printed with 8 page numbers, and if the book content has a word count, the length of the page happens to be arranged to 64 (multiple of 8) pages, exactly 8 full printed sheets are needed, which is the perfect condition. There are tens of thousands of books in real life, and the page numbers are not all so coincident, that is to say, there are non-complete prints that cannot be filled. In the above example, if the content of the book is only 60 pages, how to arrange it? Do you discard the last 4 page numbers and leave them blank? Under normal conditions, we rarely find double-sided blank pages in books! Therefore, we are faced with an urgent problem: how to arrange and set page numbers for blank page signatures.
If the book has double-sided white pages, how to arrange it?
The following is an example of a folio offset printing machine, 32 format, vertical cross-folding, and book binding.
(1) If the page number of the book is exactly a multiple of 32, such as 128 pages, 256 pages ... then it is easy to handle, and typeset directly according to the page number above.
(2) If the book has 33 pages of content, except for 32 pages of the entire printed sheet, the remaining film on page 33 is processed independently, pasted on a large film and then exposed. The actual process generally only spells 8 open (ie 0.25 printed sheets) , And did not fill up 16 copies like the whole printed sheet. Then cover up the entire folio with 4 exposures. If there are 34 pages of word content, it is the same as 33 pages, but there are words on the back, which means that the situation of the parity page is the same.
(3) If the book has 42 pages of word content. Excluding 32 pages of the entire printed sheet, 10 codes remain.
10 ÷ 32 = 0.3125
If it is spelled like 33 pages, then there are 3 white pages (6 page numbers) left, which is undesirable. At this time, the white page needs to be added into 12 codes 12 ÷ 32 = 0.375
At this time, 0.25 printed sheets, that is, 8 page numbers 0.25 × 32 = 8
0.375-0.25 = 0.125
0.125 printed sheets remaining 0.125 × 32 = 4
Print the last 4 page numbers (including a double-sided white page)
In other words, pages 1 to 32 are on one page, pages 33 to 40 are on the other page, pages 41 to 42 and a white page are on the third page. Finally print separately, and then stick pages, sets or inserts.
(4) If the book has 50 pages of text content, the same reason as above, except for the 32 pages of the entire printed sheet, there are 18 pages, of which 16 pages are printed with 0.5 printed sheets. The PS version can print two copies of the book signature. For the remaining 2 pages, see the analysis on page 33 in (2).
Therefore, the layout of non-full-printed book signatures is essentially a step-by-step idea. Of course, if you want to force violations, such as using 16 identical films to fill the entire printed sheet for all single codes, it will take a lot of time.
Another point to note is that in actual production, in order to ensure that the pages will not be peeled off or dropped, usually the non-printed sheets and single sheets are bound in the entire printed sheet, that is to say, a complete printed sheet is not a continuous page number ( 1 ～ 32), but the page numbers separated by an area are reserved for single-code insertion.
Of course, some people will say that these special page numbers can be avoided by using other special folding methods, such as parallel folding and mixed folding. Take one of the parallel folds, the Baoxin fold, as an example. It is based on the order of the page numbers, and the first folded paper edge is sandwiched between them. It is often used for 6 to 10 pages. Mixed fold is a folding method that has both parallel folds and vertical cross folds, both turning and rolling folds, and is often used in 6-page, 9-page, double-folding. Admittedly, the idea is correct, but for an enterprise, its folding process and equipment are fixed for a period of time, and no one wants the appearance of books with special page number requirements. Once it occurs, the equipment is inherently unchanged People, ideas, and craftsmanship are flexible, so we have to adjust the craftsmanship according to the machine. It is necessary to adopt the arrangement of the blank page signature page numbers introduced above!
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