Question: In the process of using the machine, some packaging bags consistently have varying lengths, sometimes longer and sometimes shorter. How can this be resolved?

Answer: This situation may be caused by an issue with the photoelectric sensor. First, check if the sensor is able to scan the markings on the film when it is in motion. Verify if there are any obstructions or debris covering the sensor, and ensure that the sensitivity is properly adjusted. Also, check if there are any color variations on the film that may be affecting the sensor's recognition. If none of these issues are present, try using a different packaging film as a test.