Film tension control method in film production

Abstract

The invention provides a control method for film tension in film productions, which comprises a film manufacturing system established in the film productions. The film manufacturing system includes at least a roll back, a material belt, a roll up and tension controller and servo-driven device. Then, a swimming roll mechanism is equipped in front of the roll-up. The swimming roll mechanism comprises a swimming roll, a swing link and a cylinder which are in continuous action with the floating roll mechanism, and a swimming roll potentiometer. After that, the tension of the material belt is kept balance with the force of the cylinder and the swimming roll is located at the center according to preset cylinder pressure. Because the swimming roll mechanism is added in the film production system, the control method for film tension in film production of the invention realizes indirect tension detection via position change of the swimming roll in the swing roll mechanism, and keeps tension realizing presetting by adjusting the position of the swimming roll timely according to detection results. The method of the invention has the advantages of simple structure and immediate reaction, which has operability, high stability and durability.

Description

technical field [0001] The invention relates to the field of handling and packaging thin materials, in particular to a method for controlling film tension in film production. technical background [0002] Tension control refers to the ability to permanently control the tension of the tape as it is conveyed on the equipment. This control must remain effective for any speed at which the machine operates, including acceleration, deceleration, and constant speed of the machine. Even in the case of emergency shutdown, it has the ability to ensure that the tape does not have the slightest damage. [0003] Traditional film production and processing tension control are basically divided into the following categories: [0004] 1. Manual tension control: Manual tension control means that in the process of winding or unwinding, when the roll diameter changes to a certain stage, the operator adjusts the manual power supply device, so as to achieve the purpose of tension control. The ...

AI Technical Summary

Problems solved by technology

However, due to the influence of factors such as torque variation, linear variation and mechanical loss of the transmission device, the absolute accuracy of this tension control is poor.

[0006] 3. Tension sensor method: it directly detects the tension, and is closely integrated with the machine without moving parts.

The disadvantage is that it cannot absorb the peak value of the tension, the acceleration and deceleration of the machine is difficult to handle, and it is not easy to achieve high-speed switching of rolls, etc.

Therefore, when the tension control system in a balanced state is strongly disturbed, the system has no time to respond in an instant, and the magnitude of the tension change on the material belt will be large, which is not good for the tension control to re-enter the balanced state as soon as possible.

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