Rubber bookbinding refers to a binding method in which hot melt glue is used to bind a book into a book without using wires or wires. Binding book quality is stable, the error rate is low, the production cycle is short, and the labor intensity is low, which is the future direction of the binding process. Here, the author combines the actual work of the factory to discuss the experience of bookbinding.
The glued process flow is:
Book Block - Mill Back - Slot - Top Gum - Top Side - Cover 1. Main material of EVA Hot Melt Adhesive EVA hot melt adhesive is a kind of fusible solid without solvent and moisture content. polymer. The hot melt adhesive is a solid at room temperature, but when heated to a certain temperature it becomes a liquid with a certain viscosity and fluidity. Its main components are EVA resin, tackifying polymerized rosin, terpene resin, microcrystalline paraffin wax with adjustable viscosity, and antioxidant di-tert-butyl p-cresol. There are many types of hot melt adhesives on the market, and the performance is not the same. When the hot melt adhesive is used, the speed of the glue binding machine can be divided into three types: low speed adhesive, medium speed adhesive, and high speed adhesive. The speed of low-speed rubber glue is set at about 2000/hour, the speed of middle-speed rubber glue is 2000 to 4000/hour, and the speed of high-speed rubber glue is 4000/hour or more. The open time of the low speed hot melt adhesive is 15 to 20 seconds, the open time of the medium speed hot melt adhesive is 5 to 10 seconds, and the open time of the high speed hot melt adhesive is 2 to 7 seconds. The curing time of the hot melt adhesive is 3 to 5 minutes. The opening time and curing time of hot melt adhesive are closely related to the glue binding speed of the bookbinding machine. Therefore, the use should be based on the type and performance of the hot melt adhesive. When selecting, attention should also be paid to the paper used in the bookbinding products, such as hot melt adhesives for coated paper and hot melt adhesives for general papers. The surface finish of different papers is different, and the requirements for the permeability, infiltration and thermal conductivity of hot melt adhesives are also different. Therefore, according to the actual choice of suitable hot melt adhesive.
2. Glue Stapling Staple Edition Staple Book Stakes Before the machine is printed, the imposition version is different from the iron stitching, saddle stitching, and lock stitching spelling. When the glue stapling book is spelled out, , Should relax the mouth 2 ~ 3mm, which is used for the plastic backing mill. Before the book block is glued with a good book, the mouth of the book is first trimmed so that the two pages of the book are also milled into a single page to ensure full penetration of the glue. If you encounter a product with a Le mouth, you should also pull the outer incision of the book on the knife before binding. When you pull the mouth, you should relax the size of the outer incision by 2 to 3 mm. This sets the product after milling the book into a book. In order to meet the standards of finished products.
3. Dealing with the signatures before the bookbinding The processing of the book block before entering the binding after the binding is a process that can not be ignored in the binding process. The flatness and tightness of the well-distributed signatures not only directly affect the normal operation of the bookbinding production line, but also have a direct impact on the quality of the finished book. If the signatures are not aligned, the binding is uneven, and the pressure is not In fact, it is transferred to the process of milling and backing. This kind of semi-finished product with defects in quality is bound to be uneven when the book is clamped by a book clip in the perfect stapler. The direct hazard is the milling cutter. Milling is not in place, and the depth of the book backing groove is not good enough. After glueing, there are many quality problems such as off page, loose leaf, empty back, lack of back and so on. Therefore, the finishing of the book is very important. Finishing is to loosen and tie up the book's signatures, and tying them. A certain number of signatures will be placed on the binding machine. Each end of each bundle of signatures shall be made of hard wood as the backing plate, and the size of the backing plate shall be related to the book. Dimensions of the posts are consistent with each other. The binding machine is started, the loose signatures are compacted, and then tied with a string. In order to stiffen and stiffen the back of the book after the binding, the polyvinyl alcohol glue is used to thinly coat the back of the bound book. After the polyvinyl alcohol glue to be brushed is dried, the bundling rope is loosened. Open, separate each book and transfer it to perfect.
4. Perfect binding for milling, backing and grooving, milling and backing, and grooving are the key steps for rubber binding. The milling back is to trim all the book blocks with good signatures into a single page along the set-up part. Beveled. Pull groove is to cut the back of the book-cut book, with a special tool to pull out the groove by a certain distance and depth, in order to increase the hot melt adhesive permeability and contact area of ​​the book back, so that the pages can be closely bonded. Milling back should be based on the thickness of the paper, the number of folding layers to determine the depth of milling, with 52 ~ 60g/m2 paper, for example, the general milling depth: three fold post book block is 1.5 ~ 2mm, four fold book The core is 2 ~ 3mm. Groove depth is generally controlled between 0.8 ~ 1.5mm, if the paper is thick, poor fiber, you can pull a little deeper, on the contrary, you can pull lighter, but the deepest should not exceed 1.5mm, the shallowest not less than 0.8mm. The shape of the drawing groove is “Δ†type, the angle is about 60°, the width of the drawing groove is generally 3 to 5 mm, and it can also be adjusted according to the situation of the paper. In general, 64 open book blocks can pull 4 to 6 slots, 32 open book blocks can pull 6 to 8 slots, 16 open book blocks can pull 8 to 10 slots, and 8 open book blocks can pull 10 to 12 slots. If the depth of the book-milling back and groove is not up to the requirement, the penetration of the glue liquid will be affected, resulting in defects such as off-page and loose-leaf. In addition, when checking whether the depth of milling back and groove is appropriate, it is also necessary to check the processing quality of semi-finished products in the process of binding, binding, and compacting of the booklet before binding, and the condition of glue-gluing.
