GPC-50 + GPG-755E is a combined system of an automatic flap-folding carton sealer and an automatic four-corner edge carton sealer, forming an automatic “H”-shaped carton sealing process. It can automatically fold the top flaps, convey cartons, perform top and bottom “I”-shaped sealing, and use auxiliary wheels on both sides to assist in sealing, ensuring that the adhesive tape is not misaligned. Immediately afterward, the cartons are pushed through an L-shaped corner and conveyed to the four-corner edge sealing station for operation. This system is simple and practical, and is widely used in industries such as food, medicine, beverages, tobacco, and daily chemicals.