The basic knowledge and development process of slitting machine

Slitting machine is a kind of mechanical equipment that slits wide paper or film into multiple narrow strips, and is often used in papermaking machinery and printing and packaging machinery. The traditional control scheme of the slitting machine is to use a large motor to drive the shaft of the rewinding and unwinding, and a magnetic particle clutch is added to the rewinding and unwinding reel, and the resistance generated by it is controlled by adjusting the current of the magnetic particle clutch to control the tension on the surface of the material. Magnetic particle clutch and brake is a special automatic actuator, which transmits torque through the magnetic particle filled in the working gap, and the magnetic state of the magnetic particle can be changed by changing the excitation current, and then the transmitted torque is adjusted. It can be used for stepless speed regulation from zero to synchronous speed, and is suitable for high-speed section fine-tuning and small and medium-power speed regulation systems. It is also used to adjust the torque by adjusting the current to ensure that the tension remains constant during the winding process. Its main feature is that the magnetic particle clutch is used as a resistance device, which is controlled by the system to output a DC voltage to control the resistance generated by the magnetic particle clutch. The main advantage is that it is a passive device that allows small tensions to be controlled. Its main disadvantage is that the speed can not be high, and it is easy to cause high-speed friction of the magnetic particle during high-speed operation, resulting in high temperature, causing the magnetic particle clutch to heat up and shorten its life.

In the modern packaging industry, the slitting machine is a relatively important equipment often used before and after press, and it mainly slits raw materials such as paper, plastic film and so on before press. This is a process that must be completed by raw material manufacturers in order to meet the width requirements of customers and other packaging manufacturers. The most widely used slitting process after printing and compounding, the slitting machine is used to cut the printing and composite film of multiple groups of patterns with a fixed width into finished film rolls, so as to adapt to the automatic packaging and bag-making process in the back.

With the improvement of flexible packaging automation, and consumer goods manufacturers focus on reducing the inefficiency and pollution of intermediate links, some manufacturers have gradually changed the process flow and replaced manual packaging with automatic packaging lines with a higher degree of automation. With the increasing demand for coils, the position of the slitting machine is becoming more and more important, which puts forward higher requirements for the working efficiency of the slitting machine.

When it comes to the working efficiency of the slitting machine, many people think that the working efficiency of the slitting machine is only related to the speed of the slitting machine, but in fact, I think the working efficiency of the slitting machine is related to the following factors: slitting speed, yield, non-operating occupation time, stability, etc. Although the slitting speed is an important indicator of the working efficiency of the slitting machine, if the yield is low, it will not only cause the work efficiency of the whole machine to be low, but also cause the cost to rise. Similarly, if the non-operation occupies a long time, such as: machine adjustment, tool setting, tool change, material change, joint, roll change, processing problems and other long time, it is meaningless to simply improve the speed of the slitting machine. Not to mention the stability of the slitting machine, which will not only affect the working efficiency of the slitting machine, but also affect the product quality, and will cause trouble and unnecessary waste to the next process. So the working efficiency of the slitting machine is a comprehensive concept.

In the slitting process, the stable tension system is an important indicator to ensure product quality, which controls the mutual tension between unwinding, traction, slitting, rewinding, etc., so that the slitting material is always in a stable state in the slitting process. If the tension is properly controlled, it can avoid the deformation and drift of raw materials in the process of increasing and decreasing the speed of the machine. Generally, the unwinding tension is slightly greater than the sum of the winding shaft tensions. Most of the previous slitting machines use magnetic powder clutches to control tension, but the speed of magnetic powder clutches can not be high, which is easy to cause high-speed friction of magnetic particles during operation, produce high temperatures, shorten its life, and in serious cases, it will be stuck, so that the operation of the machine is blocked. With the development of science and technology, the use of servo drive technology, now most of the vector frequency conversion motor is used to control the tension system of the slitting machine, the use of pendulum roller automatic detection, the man-machine interface is intuitive, the tension system is more stable and reliable, easy to operate.