Introduction to film winding principle TNT

Introduction to film winding principle TNT
Slitting machine theory The winding principle of TNT film is a regular summary of coupling the three factors of tension, pressure and torque to achieve the optimal winding effect. According to the physical properties of different film materials, TNT is adjusted and controlled to finally obtain a finished film roll with appropriate hardness and no defects.
Tension (T) refers to the tension of the film material, N (pressure) refers to the pressure exerted on the winding film by the pressure roller, and T (torque) refers to the torque generated by the central transmission device. Film winding tension principle Film winding tension is of great significance in the TNT principle. It can be used to control the hardness of the roll material when winding some elastic film materials.
Generally speaking, the amount of tension for winding is based on experience. Greater tension means more tensile force is exerted on the material, and the winding material will eventually become harder. However, the tension of the film can depend on the properties and thickness of the material itself. The tension value must be maintained at the elastic limit of the material that is allowed to stretch, which is generally between 10% and 25%.
When we rely on tension to control the hardness of the film roll, the winding tension will steadily weaken as the diameter of the film roll increases, and the weakening amplitude is generally between 0 and 50%. Slowly and steadily reducing tension can reduce problems such as end bulges, star shapes, and deformation of the finished film.