1. Universal sealing machine. It can adjust certain mechanisms to change the size of the sealing machine to accommodate the sealing of boxes of various sizes. It adapts to a wide range and is a commonly used sealing machine. 2. Special sealing machine. It can only seal a box of a certain size, and it has a fast sealing speed and is suitable for large-volume sealing operations. 3. Random type sealing machine. It is within the specified size range, the relevant institutions can automatically change to meet the sealing needs of different sizes of boxes, is a highly automated sealing machine.