Abstract : This paper introduces the different applications of AC variable frequency speed control devices in plastic film manufacturing production lines and auxiliary equipment, addressing the varying requirements of film production equipment for drive systems. The advantages and principles of each application are explained. Keywords : Variable frequency drive, film drive, control 1. Introduction Biaxially oriented film has a wide market in China, and stretching equipment is widely distributed. In the film stretching production process, continuous speed regulation is often required to meet the production process requirements. With the popularization of AC speed regulation technology, variable frequency drives are increasingly being used in the production of biaxially oriented films. The application of variable frequency drives has improved the production quality of films, reduced production costs, and decreased equipment maintenance costs, bringing significant profits to users. Below, based on the characteristics of this industry and combined with practical experience, this paper briefly introduces the application of variable frequency drives in this industry in recent years. [b]2. Practical Applications 2.1 Dual Motors Eliminating Backlash[/b] In the film stretching industry, the speed of the quench drum is the benchmark for the entire production line, and all other transmission parts are linked to its speed. Speed ​​fluctuations (or errors 1) during rapid cooling are amplified by the speed amplification effect of the longitudinal stretching machine, causing instability in the speed of the entire line and affecting production quality. Therefore, speed control of the rapid cooling drum is crucial. [b][align=center]For more details, please click: Application of Frequency Converters in the Stretch Film Industry[/align][/b]