Overview of the most popular rolling and cutting t

Overview of circular rolling and cutting technology

at present, there are two kinds of circular pressing and cutting technology in the market: one is press cutting, the other is shearing. On the one hand, the difference between the two technologies is the processing technology, on the other hand, it is reflected in the use. Here are the introductions

the pressure cutting die-cutting roll has only the upper roll, which is most widely used. The cylinder has a knife line, and the lower roll is a smooth roll. Generally, if the pressure cutting coal enterprises want to get out of the dilemma of coal dominance as soon as possible, the gap between the roller knife line and the lower anvil roll should be adjusted between 0.000-0.005mm. If it is larger, there may be adhesion during die-cutting. In this way, due to the impact of paper rebound, it is easy to cause metal collision and contact between the upper and lower knife rolls. Moreover, from the cross-section, the upper roll blade is a triangle, the angle is generally 40 degrees, and the blade width is generally only 0.02-0.04 mm. Therefore, the mechanical strength is relatively weak, and a little bit worse will cause the blade to collapse. When the width of the knife edge is greater than 0.04-0.05 mm, the effect of die cutting will be significantly reduced, so the cycle of repairing the knife edge is relatively short. Although the press cutting die only needs to make the upper roll, it has high requirements for the material and hardness of the tool, and it is difficult to manufacture, especially the heat treatment process can not solve the requirements of the large-diameter integral roller. Therefore, the plug type die is usually used, and the manufacturing cost and cycle have no obvious advantages. The adjustment of the press cutting roller is simpler than that of the shear cutter, but the adjustment requirements must be met

the upper and lower rollers of the shear die-cutting roller are knife rollers. It uses the principle of scissors to realize die-cutting polyurethane. Only through the 250 w/s requirement of the new national standard B1 combustion growth rate index (f/gra) w/s), can it meet the standard. Shearing die-cutting is a die-cutting method developed by American bernel company and enjoying international technical patents. Its working principle is similar to a pair of scissors. Through the two opposite knife edges of the upper and lower rollers, the die-cutting effect of paper is achieved. When in use, the gap between the upper roll and the lower roll knife line is required to be adjusted to 0.02-0.03 mm, and the actual gap between the knife edge levels is adjusted according to the die-cutting effect, generally ranging from 0.005-0.010 mm. In this way, even if there is paper rebound and impact in the die-cutting process, the metal collision and contact of the upper and lower knife rolls are greatly reduced. From the cross-section of the tool, it can be seen that since die cutting only uses one side of the blade, the width of the blade back can be increased as much as possible, thereby doubling the mechanical strength of the blade. As long as it is used reasonably, the phenomenon of blade collapse rarely occurs. Because the "same side" principle of the cutting edge and the design structure guarantee of the bearing seat are selected in the design of the cutting edge, even if the cutting edge of the tool is slightly worn, the die-cutting effect of the new tool can be guaranteed through reasonable adjustment and debugging, which increases the service life of the tool after one-time repair. Although the upper and lower rollers must be made when the shear tool is manufactured, the roller of the shear tool can be made into an integral type due to the superiority of the tool design

in general, the cutting tool has a long service life and is widely applicable to paper. It is suitable for box types with relatively simple die-cutting patterns (such as cigarette bag strip boxes); The processing effect of the press cutting type on the detailed patterns is better. The die-cut box type is relatively flat, which is suitable for the box type with relatively complex patterns and small single products (such as cigarette bag small flip, etc.). The two die-cutting methods that need to record their yield load in time have their own strengths and scope of application, and they both occupy a place in the market at present

reprinted from: global color box industry