Post press binding technology of the most popular

2022-09-23
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Post press binding process of on-demand printing books

now that we have various efficient equipment to realize on-demand printing of books and periodicals, we should pay more attention to how to bind books. In some binding systems we can involve, we found many meaningful new products, although still at a low level, which can also surprise people in the market with a shortage of binding equipment

at present, most books are paperback books. The binding of this kind of books is completed by gluing the cover on the spine and page with glue. The printing profession must meet the requirements of a] and b) as far as possible. The term is called binding. No matter whether such a book is really perfect (the word binding also means perfect binding in English), it is still a relatively satisfactory binding method and plays a decisive role in the book printing industry

in this article, we will discuss those binding techniques suitable for digital book printing. We will choose the perspective of producing books for sale, so we will only study the binding methods of books we buy from bookstores and can read at home. In other words, there is only one color cover, and the size after trimming the edge of the book is 69 inches, with an error range of 1 inch up and down. We can assume that the bound book will become a book with neat three sides. For simplicity, we also assume that the contents of books and periodicals are black and white (in fact, many books are like this). There are many kinds of bookbinding methods for this kind of books, each with its own advantages and disadvantages

in this article, we will first set up a stage to describe the basic processes and methods related to binding. Then we will briefly introduce some such devices. Finally, we will return to the problem of how to choose different devices according to different requirements. Facts have proved that even after 10 years of on-demand binding production, it is still difficult to choose the best binding equipment suitable for many production environments

several factors of binding

in many places, a key problem is whether the purpose of printing is to print some single pages, or whether it will print different booklets on each page, or print exactly the same books according to the expected requirements. If these books are printed according to the order of a guest, it is very important to choose the equipment and software that can meet various needs (for example, the books they print will be placed in bookstores or used for certain services). Nowadays, the installation of most on-demand printing equipment is designed for printing dozens or hundreds of short edition printing jobs. At this point, the demand depends on the publisher rather than individual customers (the notable exception is the lightningsource device of Ingram, which can really be used to deal with the demand of single print). From receiving the task, to production, and then to transportation, when the number of prints is small, they will become very easy to do. However, real on-demand production, such as the production of only one printed book, will become more and more important in the future, and there have been some related equipment and tools

preparation link

before we begin to discuss the binding process, we will explain the links that need preparation and attention. Because they are directly related to the selection of binding methods. We believe that the following conditions should be met: the manuscript is complete and has been arranged by page; A suitable outer cover has been designed, and the spine conforms to the thickness of the book; A suitable monochrome printer is also ready; Be able to print on both sides of the paper at an appropriate speed according to the designed volume of the book; The color cover has found the corresponding color to print

full page

once the book is typeset, the next step is to group the book for printing. This is relatively easy in the environment of digital printing, because the size of paper is closely related to the size of the designed page number (in drum printing, it should be related to the width of the drum). The most basic question is whether the book is printed on one page (only one page printed on a piece of printing paper) or two pages (two pages printed on a piece of printing paper). In some roller equipment, three page printing is sometimes carried out

orientation of paper texture

another factor that affects the composition design is the orientation of paper texture. If the texture of the paper is just parallel to the spine, the book is easy to open and the binding security is relatively high. In many cases, the paper texture will be determined in the right direction, but in other cases it is not. In fact, when printing on a cylinder press, the direction of the paper texture cannot be selected. For the size of many pages, you can choose where to start printing from, but other times, you can't choose. The direction of the paper texture you get is only in this direction. Fortunately, the orientation of paper texture is not a very important problem for ordinary paper, especially in the digital printing of some light-weight printing paper

viscose

many times, hot-melt adhesives are used in binding technology. Although cold glue is also useful, it can only be used on a few kinds of equipment. Therefore, we will not discuss it here. At present, there are mainly two kinds of thermosols: Standard thermosols made of EVA and pur glue. Pur is a new product, which is mainly used for high-strength binding and has a wide temperature tolerance range. However, it is relatively expensive and requires a long curing and drying process. In addition, it also requires special treatment process to prevent it from turning into gas in the process of binding. These reasons limit its use, mainly for large-capacity traditional binding. In digital printing, we still adhere to the traditional hot-melt adhesive

various methods of binding

comb case cover is a finishing process for the binding process, which will make the book more firm and easy to open. At this time, the front and back covers are delimited with a small area of one inch from the spine to form the seam (comb shell) of the spine on the cover, and the glue is extended to the corresponding parts of the last page and the first page according to the appropriate amount. This method of attaching the cover can make the last page and the first page safer; Make it easier to open books. But most small binding machines cannot do this

another binding method is floating spine. The most basic binding is to apply glue directly to the spine of the book. This will prevent the book from flattening when it is opened on the table, which may not be a problem for some books, but it will not be welcomed for others. For example, when you are busy doing other things, but you have to refer to the contents of the book, in this case, what do you do, such as piano recipes, recipes and some reference books. An effective way to make a glued book lie flat is to apply glue only to the edge of the book, while the rest of the spine is floating

preparing the spine

most large and medium-sized binding machines will use many methods when preparing the spine, but the first choice is to use glue. They apply glue to the scratches on the spine, which makes the surface of the spine smooth and easier to glue when binding

as we have determined, although the preparation of such books cannot hurt the book itself, it is unnecessary for most digital printing products. The glue will be fixed at the free edge of the page, so that the pages can be lined up. On the other hand, the preparation of spine is more important for lithography. Because the distinctive feature of lithography is that there are often fold edges and many overlaps. In this case, ink scratches are very important, so that the glue can reach every page

consideration of cover

the printing of cover is indispensable in the steps of binding books. If it is short edition printing (hundreds of copies), the cover of lithography is very practical. But usually we choose to use toner based printing. The color agent used for cover printing is usually coated, which can not only maintain the durability of the cover, but also make the cover look 40 ~ 77hrd closer to the quality of lithography. The cover of ink-jet printing has been widely spread, and it does not necessarily have to be covered with film. It can avoid the scratch of toner, which often appears in the place where the cover is often bent

light edge

after binding, books often need to be trimmed on three sides to achieve a beautiful appearance. In addition, the light edge also has practical value: if the outer book edge is not trimmed (the edge opposite to the spine), the book is not easy to turn. There are three methods of light edge: for mass printing, three knife cutting light edge is very feasible, but the price is relatively expensive. You can also choose any size of paper cutter, manual or electric. This aspect also requires three knives, which is a labor-intensive method; The third method is to use a computer-controlled single knife paper cutter, which can rotate and position books

in principle, if the pages of the book are cut quite accurately; If the cover of the book is appropriate, the size of the page and the thickness of the spine are also appropriate when subjected to alternating stress; If the page and cover have been well calibrated during binding. If these assumptions are true, then there is no need for further trimming. In this case, we call it cover only (TCO), which can be achieved by all kinds of machines listed below. You will find that they sometimes start to pass when the pages are not in line. Therefore, they are sometimes untrustworthy, but in most cases, they can still complete the task

online or offline

is your binding machine connected with your printing machine (online) or in another separate workshop (offline)? The advantage of online operation is obvious: there is no gap. This kind of work without gap can save labor and reduce the waste caused by artificial things. Online working should be used in most mass-produced digital printing systems, but it is rarely used in practice. Why? Because in most cases, it is not cost-effective, which is what we will discuss in the next section

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