The bottom of the box bears the weight of the product, emphasizing sturdiness. In addition, when loading products, whether it is machine filling or manual filling, simple structure and convenient assembly are the basic requirements. The bottom of the tube packaging box mainly has the following methods
1：Plug-in self-locking bottom
Utilize the 4 rocker parts at the bottom of the tube box and design them to snap into each other. This occlusion is accomplished through two steps of "separation" and "insertion". It is easy to assemble and has a certain carrying capacity. it is more commonly used in tubular packs
2：automatic bottom lock
The self-locking bottom packaging box adopts the pre-glue processing method, but it can still be flattened after bonding. When in use, just open the box, and the bottom of the tube packaging box will automatically return to the locked state. It is extremely convenient to use, saves time and effort, has good carrying capacity, and is suitable for automatic production. Usually, this design structure is chosen for packaging design of heavy items
3：Rocker arm double socket rear cover
Its structure is exactly the same as that of the box cover of the rotary cover. This design structure is easy to use, but the load-bearing capacity is weak. It is usually suitable for packaging food, stationery, toothpaste, etc., which are small in size or light in weight. It is a more common box design structure
4：Partial wall back cover type
The wall bottom sealing structure is a structure in which the four flaps of the tube packaging box are designed to function as partition walls. After assembly, a partition wall will be formed inside the tube packaging box, which can effectively separate and fix the goods and play a good role in protection. The middle wall is integrated with the box body, which can effectively save costs, and the structure of this tubular packaging box has high compressive strength
5：other evolutionary structures
According to the above commonly used basic tubular packaging structure model, some other structural forms can also be evolved through design
