Vertical Form Fill Seal (VFFS) machines use control systems and sensors to keep packaging consistent from bag to bag. A PLC coordinates the main functions, film feed, filling, sealing, and cutting, while photo sensors and encoders track film position, registration marks, and bag length. These components work together to correct small variations automatically, helping maintain seal accuracy and reduce material waste during continuous operation.
In Unified Flex VFFS machines, these controls are standard. They include digital temperature regulation, servo-driven film pulling, and encoder-based length measurement to keep production stable at higher speeds and across different materials.