Solutions to common problems in book imposition

In production practice, some book layouts have no problem only from the point of view of platemaking, but due to imperfect consideration of the binding process at the time of imposition, and people's habits of production methods, artificially setting obstacles for the improvement of the quality of books and periodicals. Many common quality problems have emerged. In fact, as long as appropriate adjustments are made during the imposition, the problems can be solved.

Hardcover book imposition

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. Shift 3-5mm, so that although the page version of the heart from the surface to see a lot of movement, visual errors, but when bound into a book, when reading will not be difficult to read the word at the mouth of the book, the book life is also very favorable .

Rubber book imposition
Today, in the bookbinding industry, glue books dominate, 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, but 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 rubber backing cannot reach 2-3mm. The situation of page dropping also appears from time to time. These issues are not strictly controlled except that the production process is not strictly controlled. There is also a certain relationship. For example: When the imposition is centered, the book will feel like the center of the book is biased toward the mouth when the book is centered and the book is centered. When the back is less than 2mm, the Ripper cannot be milled. 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. Invisibly, the size of the folded finished product is increased by 2mm, and the general milling is 2-3mm, and the adhesive thickness is 1-2mm. Since the center of the printing plate is centered, about 2mm is cut out at the opening, 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, most books and newspapers are mainly printed on 1168mm x 850mm. If it is four fold, 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 printable with 11 94mm x 889mm paper will increase the cost.

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.