Description of the reasons why the bag making machine is different in length

In the process of making bags, the finished plastic bags will vary in length, sometimes long and sometimes short. If so, the plastic bags produced are unqualified, but why does this happen and how to solve it? What causes this phenomenon?
Hot cutting bag making machine
Here is a detailed analysis of this situation:
One of the reasons: there is a lot of dust on the photoelectric head of the plastic bag making machine. When there is too much dust on the photoelectric controller, it will affect the brightness and intensity of the laser, so the length of the plastic bag can not be accurately controlled;
The second reason is that the photoelectric head of plastic bag making machine is faulty. Because the quality of the bag-making machine of some businesses can not be guaranteed, the poor photoelectric head accessories are used, resulting in the sensitivity not reaching the standard. The solution is to replace the photoelectric head;
The third reason is that the operating speed of the plastic bag making machine is too high. Some accessories can not be more rhythmic, and should be tested at a lower speed;
The fourth reason is that the longitudinal sealing knife is too tight. Increase the feeding pressure;
The fifth reason is that the feeding and pressing devices of the plastic bag making machine are not synchronized. The feeding is too fast, too slow or too tight, and the hold-down device is too loose, which is easy to cause the length of plastic bags to vary;
The sixth reason is that the tracking electricity of the bag-making machine is not obvious. The quality of tracking parts is poor, or they are used too long, and the actual effect is not obvious, and they can not play their due functions well;
These are the main reasons and solutions for the different lengths of plastic bags when making bags.