Horseback riding is mostly used for magazines, pictures, primary and secondary school books and so on. Most of these books and periodicals contain 1 to 4 sheets of paper, 60-80 g/m2 offset paper for paper, and 105-157 g/m2 copperplate paper for high-grade publications. After carefully observing the semi-finished products folded together, it will be found that there will be a cumulative width after the overlap between the posts and the signatures. When the book thickness increases by 1 mm, the lateral overlapping width of the spine will increase by 0.5 mm, and the number of posts increases. And increase. 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 cutting into finished products, the innermost pages will be cut to about 2mm, which is not too obvious for the quality of the page. When the number of posts is increased to 4 posts, the width of the book's spine will generally be accumulated. Increased to 3-5mm, Relief was invisiblely extruded, trapezoidal edge formed at the incision. 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 page numbers have been cut off, and some have obviously moved to the cut edge. The entire page position of the book is seriously deviated, which directly damages the overall design of the page.
How can we solve this problem? First of all, we must understand the characteristics of the product, the type of paper used and the number of posts. For general magazines with only 1-2 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, the time of imposition is 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 version, 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, up to move about 5mm, and in turn 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.
Source: Chenyi Printing Network
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