Stitching application example for saddle stitching

Horseback riding is mostly used for magazines, pictures, primary and secondary school books and so on. Most of these books and magazines have 1 to 4 printed pages, 60 to 80 g/m2 offset paper for paper, and 105 to 157 g/m2 coated paper for high-end publications. A careful observation of the semi-finished products folded together will reveal that an accumulated width appears between the posts and the placards. Each 1mm increase in the book thickness increases the lateral width of the spine by 0.5mm, and increases with the number of posts. Incremental. In the case of two sheets below, the width of the book spine at the mouth of the book is about 2 mm. After the saddle stitches, the overlapping pages of the book spine will be tightened by wire nails. When the finished product is cut into finished products, the innermost book page will be cut off by about 2mm. This has no obvious effect on the quality of the page. When the number of posts is increased to 4 posts, the accumulated width at the spine of the book will generally increase. To 3 ~ 5mm, the most Retiei is invisiblely extruded, forming a trapezoidal edge at the cut. Since the 4 posts can't be tight, sometimes the stacking width of the spine is more than 5mm, and the width difference cannot be solved. When trimming, the finished edge of the inner page is cut off by 5mm, and the finished book is opened. The inner part of the finished product was cut off, and some of the framed images were not centered. The most serious is that some pages have been cut off, and some have moved to the edge of the cut. The page position of the entire book is seriously deviated, which directly damages the overall printing of the page.

So, how can we solve this problem? First of all, we must understand the characteristics of the product, the type of paper selected and the number of posts. For general magazines with only 1 to 2 posts, use 60g/m2 offset paper, which can be placed in the center of the board according to the normal imposition method; if it is a 4-post book, no matter which type of paper is used, 3 pages of all pages of the heart should move about 3mm to the mouth, the fourth post on this basis should be increased to about 5mm, do not worry about the version of the heart will move unexpected quality problems; if it is high-end print, you can use the computer Imposition system, to 1~4 placards, page number 1~32, 33~64 to the mouth of the mouth to do a gradual movement, from the inside of the page 32p and 33p, move up to about 5mm, and in order to gradually gradient to 1p and 64p The central position stops. In addition, it is also possible to fold a complete sample book with the requested paper before the imposition, and measure the width of the superposed spine so as to obtain accurate data and then perform production, which can reduce unnecessary waste.

In fact, whether it is a 16-page format or a 32-page format, all considerations must be given based on the design of the page, the thickness of the books, and the types of papers and specifications used. Generally, the thickness of the book is about 20mm, and the printing center can move 3mm toward the cutting direction; when the thickness of the book is about 40mm, the printing center moves less than 5mm toward the cutting direction. The printing plate produced by the above methods is not only conducive to printing, but also has been fully guaranteed to improve the quality of the binding process. What is more important is that readers can open the book at a glance and can also extend the useful life of the book.

Hardcover books are generally mostly dictionaries and literature, and editions are mainly written with the sixth character. Due to the large version of the book, the size of the mouthpieces and cuts is limited. In this way, when the book thickness is about 20mm, the book can be fully opened, the book can be opened, and the text at the mouth can be seen without inconvenience. When the book thickness increases to more than 40mm, because the book back is hard, often can not be fully developed, near the set of words to read the text is also more laborious, only forced to open to see the whole, a long time, the spine is easy to disconnect. In view of this type of situation, the book's finished product size, layout center size, layout design features, and binding process requirements should be considered in a comprehensive manner, and appropriate adjustments should be made so as not to affect customer requirements and the quality of the finished product. Move 3 ~ 5mm (Figure 1), so that although the surface of the page version of the heart moves a lot, visual errors, but when bound into a book, when reading will not be difficult to read the text at the mouth of the book, the life of the book The extension is also very favorable.

Today, books binding industry dominates glue books, and 3-50mm thick books are common. However, some manufacturers do not care about the amount of paper, but only fast folding, labor hours, often do not comply with the requirements of the press and publication industry standards (ie, 30% off and more than 30% of the signatures should be excluded from the air excluded), resulting in significant changes after the opening The character's wrinkles, dead folds, and also violate the "60 ~ 80g/m2 paper up to three fold" provisions, often folded in four cases, such consequences in addition to creases with folds, dead fold, skew outside It will also make it impossible to tie between the posts and the posts when collating, and the depth of the glued backs can not reach 2~3mm. At the same time, the situation of page dropping also appears from time to time. These problems are not strictly controlled except for the production process management. There is also a certain relationship. For example, when the imposition is centered, when the bookbinding and milling back is larger than 2mm, the book will feel like the center of the book will be biased toward the mouth, and the text in the middle seam will be difficult to read; if the back is less than 2mm, the Ribble cannot be milled, and the heat is melted. It is difficult for the glue to penetrate into the inner pages, and it is impossible for them to stick together. The quality problems of page dropping and oblique pages often occur.

There are also some manufacturers to add two mm to the fold crease at the time of the imposition, and the center of mind is still centered. This can virtually increase the size of the folded finished product by 2mm. Generally, it is milled 2~3mm, and the adhesive thickness is 1~2mm. Since the center of the plate is centered, about 2mm is cut off at the mouth, and the thickness is about 2mm. When cutting, we must use the spine as a rule. Then, the finished product will be cut off by 2mm. When we look at the finished product, it will make people feel that the version will be biased toward the cut, directly affecting the beauty of the page. In addition, the majority of books and magazines are based on 1168mm x 850mm. If it is a quadruple quote, plus an additional 4mm, the print size becomes very tense. In particular, some bleeding pages do not have enough gargles, causing difficulties in printing. Only 1194mm x 889mm paper can be used for printing, which will increase costs.

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