Currently, The most common binding methods in the printing market include saddle stitching, flat stitching, lock stitching, wireless binding, lock binding, and plastic line hot stamping. Among them, perfect binding is one of the most commonly used binding methods. In the actual work, the author found that when using the wireless binding method to bind books and periodicals, if the parameters of milling back, hairing, gluing and other links are improperly set or the operation is not standardized, it is easy to appear loose pages and pages, which causes serious waste. Affect the quality of book binding.
In this paper, the author has made a detailed analysis on the above-mentioned links that are prone to the publication of pages and pages, and gives relevant suggestions. I hope that it will help the glue-binding workers.
Milling back
Milling back refers to the process of milling or milling the back of the book block into a groove with a milling cutter or a saw blade to facilitate the penetration of the glue. The purpose of the milling back is to mill the book block to ensure that each page of the book block is a single page. If the depth of the milling back is not enough, and some of the pages are not milled, it will affect the penetration of the glue, resulting in loose pages and dropped pages. In addition, if the quality of the milling cutter is not good or the parameter setting of the milling back is unreasonable, the depth of the milling back will be insufficient, which will affect the penetration of the glue, resulting in loose pages and dropped pages of the book.
The milling back depth is determined by the number of folds and the thickness of the paper. In general, the back depth of the tri-fold book is 1.0 to 1.5 mm, and as the number of folds increases, the depth of the milling back is deeper, which can be increased to 2.0 to 3.0 mm, otherwise it is difficult to guarantee each of the book blocks. Pages are all single pages. Of course, the depth of the milling back is not as large as possible. If the depth of the milling back is too large, the size of the book will become smaller, resulting in a shrinkage.
Fleece
The purpose of the hair is to loosen the fibers on the back edge of the book and form a rough surface, so that the glue can penetrate the surface of the paper along the fibers, so that the pages of the book are bonded to each other, so that the book is glued more firmly. If the back of the book is not roughed or the depth of the hair is not enough, the glue will hardly penetrate into the inside of the paper, but only adhere to the surface of the paper, causing the book block and the cover to be weakly bonded, and the book will be loose and dropped; if the back of the book Excessively fluffing, forming a rough surface of the book, the back surface of the book will gather paper and air, which will prevent the glue and paper from coming into contact, which will also affect the penetration of the glue into the paper, resulting in a weak bond between the book block and the cover. Page, page drop.
In order to facilitate the penetration of the glue, ensure that the back of the book and the book block are firmly bonded. When the bookbinding is performed, the groove spacing of the hair is generally set to 2.0 to 20.0 mm, and the groove depth is set to 0.5 to 1.5 mm.
Gluing
Since the hot melt adhesive is in a solid state at normal temperature, it needs to be heated during use. When heating, if the temperature is too low, the viscosity of the hot melt adhesive will increase, the fluidity and permeability will become smaller, and it is difficult to penetrate into the back of the book during sizing, thereby affecting the firmness of the book back bond. If the temperature is too high, the fluidity and permeability of the hot melt adhesive will become large, and the viscosity will be lowered, so that the pages cannot be firmly bonded, so that the pages of the book are dropped and scattered. In addition, when sizing, it is necessary to glue the back of the book and the back of the book, wherein the sizing process of the back of the book is the upper backing, and the sizing process on both sides of the spine is the upper side glue.
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