The perfect binding process has the advantages of simplicity, high quality, stability, and high efficiency. Therefore, it has developed rapidly in the book printing industry in recent years. However, in the popularization process, many manufacturers have encountered quality problems in hot melt adhesives to varying degrees, and have paid a great price for this. 1. The internal book pages are not compacted before assembly. Each book has many printed sheets and many signatures, and the book block is too loose. After the pages of the internal documents are folded, they must be bundled with a 10mm thick high-density board to compact the spine of the signature, especially the set of signatures folded by the folding device of the rotary offset press. However, it should be avoided that the bundle length is too long. The bundled cardboard (the size of the cardboard should be larger than the format size by more than 10mm) is not aligned with the spine of the signature, and the ruled edges of the sky (A side) and the spine (B side) are avoided. There is a stepped shape during transportation. 2. The direction of the cover paper is incorrect When choosing the cover paper, the printing house must choose the standard format paper whose paper thread direction is perpendicular to the spine line, especially those covers with special format and joint edition, and as far as possible to ensure that the head, the foot couplet or the head and tail phase To ensure the consistency of the paper on each cover. 3. The cover paper is too poor "People have a face, and a book has a skin." The cover of the book must use good quality paper, but the key is the choice of the author. 4. The milling cutter is worn and not sharp The groove cutter and the bottom plate of the groove are worn, the gap is too large, the milling is cracked, the rubber back is loose, and the thickness of the book back is increased. (1) The mechanic repairs the milling cutter frequently. Before using the new milling cutter, use a whetstone to tip the tip of the cutter to R = 2mm. Avoid too sharp tip, the gap at the bottom of the groove is too small, so that the bottom of the groove is not filled with glue. (2) Whether it is a Martini or Warren Berg glued linkage line, the slotted bottom plates that are randomly provided and matched with the milling cutter are mostly organic plates or nylon plastic plates. This type of bottom plate has poor toughness and is not resistant. High temperature and fast wear. Once the continuous production, the front edge will be worn due to heat, the groove corresponding to the arc-shaped milling head and the bottom plate of the slot is too large (should be less than 0.10mm), so the milled slot becomes "tear groove". ①The surface of the tear groove is fluffy and the glue is not strong, so it must be worn and replaced frequently. The same is true for back milling cutters. ②The bottom of the groove root of the tear groove is scattered, and there is a little paper scraps. The gap is not filled with glue and the root of the book is not firmly bonded. ③ The tear groove is easy to cause loose pages on the back of the book, and the thickness of the back of the book increases after the glue is glued on, which is commonly known as "big". Treatment method: replace the milling groove bottom plate with a steel plate, weld a hardness alloy bar at the edge of the steel plate that is consistent with the angle of the milling cutter (60 °), and form an upper and lower knife with the milling cutter. 5. The side rubber bump protrudes, increasing the space of the spine gap Regardless of whether it is a glue binding linkage line or a glue binding disc stand-alone, brushing the glue is done by squeezing the outer sides of the two copper wheels. The width of the glue on the upper side of the glue binding machine is the thickness of the copper wheels on both sides. Because the sides of the two copper wheels are too smooth, the gap between the sides of the two copper wheels is too small, and the spring tension of the two copper wheels is too large. There is often no upper side rubber in the range of 3mm to 4mm, but outside the width of the side rubber wheels. A rubber bump with irregular height and narrow width was installed. The solution is as follows: (1) Based on the principle of easy glue hanging, the outer circles of the two copper side rubber wheels are knurled (diamond shaped). Rolling groove parallel to the axial direction. (2) Adjust the gap between the top scraper of the side rubber wheel bracket and the top surface of the copper wheel to be zero, and use a scraper to clean the yellow glue layer on the top surface of the copper wheel from the heat and scorching. Prevent the rubber squeezed out from the side of the copper wheel from accumulating on the top surface of the copper wheel. With the centrifugal effect of the continuous rotation of the copper wheel, an irregular rubber bar with a high, low, wide and narrow width is left at the spine 4mm. [next] 6. Unreasonable adjustment of the position of the three-sided knife jack pressure plate from the spine The three-sided cutter of the binding line is randomly matched with 32- and 16-kilometer dowel-tailed, wood-inlaid press plates. Some operators do not perform trimming, and only replace the two specifications of the jack pressure plate provided with the machine according to the difference in the cutting format. This is not appropriate, and different weights should be used according to the printed sheets (thickness of the back) of the book being cut. The height of the three-sided knife to cut the book each time is limited. The fewer the printed pages of each cut of the book, the more the number of copies. The more printed pages, the fewer the number of copies. If each book contains one of the five factors mentioned above, then the more the number of books to be cut each time, the greater the chance of spine rupture. Conversely, the less chance of spine rupture. If 8 books are cut at a time, the height of the first and second seals of each book is 2mm. The spine pulp opening of these 8 books is 16mm higher than the back of the book. When cutting, the pressure plate falls first and the pages are locked. And the back of the book is hanging, so the back of the book will rupture when cutting. Responses: (1) According to trial cutting, gradually reduce the number of copies for each cut (2) Taking the randomly-loaded jack press plate as the base, first of all, under the premise of handling the above five factors, according to the thickness of the back of the book that is often cut, it is divided into 3 to 4 types of press plates. The production of these types of pressure plates is based on the size of the format (32 and 16). Each type is made of 3 to 4 pieces of wood with a thickness of 5mm to 10mm. The length is less than the format size of 6mm to 8mm, and the width is less than the format size of 10mm to 20mm. According to the 3 ~ 4 types of book backing based on experience, two layers of 3mm thick Liaoyang paperboard were glued on the self-made wooden board and fixed on the base of the random belt with wood screws. When bonding the two Liaoyang cardboards, the spine should grow 3mm and 6mm of the homemade board respectively. When cutting, it will be plastically bent after being stressed, forming different slopes according to the height of the spine to compact the side glue mouth and The height of the back of the book, and can avoid wrinkling of the back of the book when cutting. According to the thickness of the cut back of the book, replace the pressure plate with different slopes. 7. Grinding of three-sided blade is unqualified If a worker wants to do his job well, he must first sharpen his weapon. The grinding of the edge of the three-sided knife is very important, it is related to whether the binding line can really exert its maximum efficiency. Responses: (1) Select a sharpening machine with high precision. Now many of the whole paper cutter and the three-sided cutter of the glue binding line are mostly carbide cutters, so the grinding of the blade is very important. In addition to the high-precision sharpening model, it is best to choose a machine with two sharpening heads, one with a white steel jade grinding wheel to grind the body, and one with a green silicon carbide grinding wheel to grind the carbide head. (2) After grinding, you must use a grinder or fine whetstone to grind, and then use paulownia wood board or foam plastic board to wipe off the remaining abrasive debris at the blade edge to prevent damage to the blade during cutting. 8. The book block paper is thick and has many folds. The edge of the fold is high and the hollow is large If the book block is made of thick paper, the open version is divided into small plates when making a plate, and the folding position of the folding folding machine should be cut when folding. 9. Adhesive on the side of the blade edge of the three sides, the cleaning is not timely When cutting with a three-sided knife, you must ensure that the angle between the back of the knife body and the cutting surface of the book is 5 ° ~ 10 ° (the angle formed by the knife body manufacturer during production and processing). Due to the continuous operation of the binding line, on the one hand, the distance of the conveyor belt is too short, and the hot melt adhesive on the back of the book is too late to fully solidify. On the other hand, the knife body itself heats up, making the hot melt adhesive easily adhere to the back of the knife body, so that the angle between the back of the knife body is zero , Increased frictional force, which is easy to cause uneven spine incision, broken back of the book and other phenomena. The countermeasures are as follows: (1) Spray silicone oil (2) Install a hot-melt adhesive cleaner (3) Use a blade to clean manually.
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Nine reasons that cause the back of the bound book to break