This equipment is particularly suitable for use on assembly lines, and can also be used individually. After automatic or manual boxing, the machine can automatically fold and seal the boxes. It can accommodate various sizes of cardboard boxes but can only fit one size at a time during a single period; manual adjustment is required to change box sizes (1-2 minutes for adjustment). It is widely used in industries such as home appliances, textiles, food, general merchandise, pharmaceuticals, and chemicals. After the cardboard boxes are sealed at the top and bottom by the initial folding and sealing machine, they enter a 90-degree corner machine and are pushed into the corner sealing machine by a pusher board. The corner sealing machine completes the sealing of the four corners at the top and bottom, achieving a perfect letter-box seal. It is suitable for automatic folding and letter-box sealing of various cardboard boxes, with the four corners of the box sealed and smoothed simultaneously, providing fast and stable performance.