During the high-speed stretching process of the small precision film longitudinal stretching machine, the wrinkles and breaks of the film are important issues that affect product quality and production efficiency. Tension control technology is the key to solving these problems. It can ensure that the film is subjected to uniform and appropriate tension during the stretching process, thereby avoiding wrinkles or breaks.
Small precision film longitudinal stretching machines are usually equipped with high-precision tension sensors. These sensors can monitor the tension changes of the film during the stretching process in real time and feed back the relevant data to the control system. For example, by installing a tension sensor on the film transmission path, the tension of the film at different positions can be accurately measured. Once the tension fluctuates abnormally, the sensor can quickly capture and transmit information in time, providing an accurate basis for subsequent tension adjustment.
Based on the data fed back by the sensor, the stretching machine uses an advanced control system to accurately adjust the tension. The control system automatically adjusts the relevant parameters of the stretching machine according to the difference between the preset tension value and the actual measured value. For example, when the tension is detected to be too high, the control system will reduce the stretching speed or reduce the pressure of the stretching roller to reduce the tension on the film; conversely, when the tension is too low, the stretching speed or pressure will be appropriately increased to restore the tension to the normal range. This real-time closed-loop control can quickly respond to tension changes and effectively avoid wrinkles or breaks in the film due to unstable tension.
In order to better adapt to the characteristics of the film at different stretching stages, small precision film longitudinal stretching machines often adopt a multi-stage tension control strategy. In the initial stage of film stretching, due to the low strength of the film, a small tension needs to be applied to prevent the film from being broken. As the stretching process proceeds, the film is gradually stretched and oriented, and the strength increases. At this time, the tension can be appropriately increased to achieve the desired stretching effect. By setting different tension values at different stages and accurately controlling the transition between stages, the film can be kept in a suitable tension state throughout the stretching process, reducing the occurrence of wrinkles and breaks.
In order to further stabilize the tension of the film, the stretching machine will also be equipped with a tension buffer device. Common buffer devices include pneumatic or spring buffer rollers. When the film tension fluctuates instantly, the buffer roller can absorb or release a certain length of the film through its own movement, thereby playing a role in buffering the tension change. For example, when the tension suddenly increases, the buffer roller will automatically retreat and release a section of the film to relieve the tension; when the tension decreases, the buffer roller will move forward, tighten the film, and maintain the stability of the tension. This buffer mechanism can effectively avoid wrinkles or breaks in the film due to sudden changes in tension.
The overall equipment accuracy and stability of the small precision film longitudinal stretching machine also play an important role in tension control. High-precision machining and assembly can ensure the parallelism, roundness and accuracy of the stretching rollers and the transmission system, so that the film can be evenly stressed during the stretching process. In addition, stable equipment operation can reduce tension fluctuations caused by factors such as equipment vibration and shaking. For example, the use of high-quality transmission components such as bearings and gears, and good foundation fixing and shock absorption treatment of the equipment can improve the stability of the equipment and create favorable conditions for precise tension control.
The small precision film longitudinal stretching machine can effectively control the tension of the film during high-speed stretching, avoid wrinkles or breaks in the film, and thus improve the stretching quality and production efficiency of the film through the comprehensive application of various technical means such as precise tension sensors, advanced control systems, multi-stage tension control strategies, tension buffer devices, and high-precision and stable equipment.
