A packaging cardboard box is an outer packaging container that is a collection and arrangement of packaging items that have already undergone various forms of packaging. The bottom of a regular cardboard or corrugated cardboard box is composed of four folding sheets (i.e. two inner folding sheets, also known as small sheets; two outer folding sheets, also known as large sheets or side sheets), and the folding sheets must be folded between the seals before sealing.

A hot press sealing machine is a mechanical device that seals packaging containers using a hot sealing method. It is widely used for heat sealing of various plastic bags. According to their different heat sealing methods, the heat sealing methods of hot press sealing machines can be divided into the following types: plate heat sealing machines, roller heat sealing machines, belt heat sealing machines, sliding rolling heat sealing machines, sliding heat sealing machines, and pulse heat sealing machines Ultrasonic heat sealing machine, high-frequency heat sealing machine