Hot Melt Adhesive For Book Spine

Book glue is mainly divided into back glue and side glue, the back glue is mainly milky white, and the side glue is mainly white transparent or light yellow transparent.

Company book glue properties.

In order to ensure the binding speed of books, different types of Hot Melt adhesives should be selected according to different machine speeds. Hot melt adhesives are divided into three types according to the binding speed: low speed binding hot melt adhesives (about 3600 copies/hour), medium speed binding hot melt adhesives (about 8000 copies/hour) and high speed binding hot melt adhesives (about 10000 copies/hour). The opening time and curing time of Hot Melt Adhesive are closely related to the speed of binding. The opening time refers to the time between the hot melt adhesive and the other adhesive after the hot melt adhesive is applied to one adhesive. The opening time indicates that the two bonded objects must be bonded within the specified time, so as to ensure the bond strength. The opening time of the low-speed machine is 15 to 20 seconds, the medium-speed machine is 5 to 10 seconds, and the high-speed machine is 2 to 7 seconds. The curing time of hot melt adhesive refers to that after the cover and book block are bonded within the specified time, they can be turned and pressurized after a certain period of cooling, which is called the curing time. If the Hot Melt Glue has not been cured, shaped and turned or cut, the back of the book will be deformed, and the hot melt glue will stick to the blade during cutting, affecting the quality of the product. When used, it should be reasonably selected according to the length of the conveyor belt, transmission speed, seasonal changes, etc. The curing time of hot melt adhesive is generally 3 to 5 minutes. 2) According to paper classification can be divided into coated paper and general paper with hot melt adhesive. The use of different types of paper, to choose the corresponding hot melt adhesive, because the paper surface finish, permeability, thermal conductivity is different. 3) According to the use of binding is classified into side glue and back glue. The hot melt adhesive used as side adhesive has good fluidity, low viscosity, long opening time and curing time, and high bonding strength. Book side glue requirements to achieve thin and uniform, bond firmly, in order to ensure the quality of the book and cutting requirements. You can't use two kinds of glue wrong. 4) According to the color of the glue classification In addition, if it is the same grade of product, yellow glue is better than white glue (but the manual generally requires the glue to be white). 302 series glue can meet the viscosity, hardness and color.