The molding machine, also known as the unpacking machine, refers to the automatic unpacking, forming, and bending of the lower bottom flap. At present, the lower part of the tape is pasted, and the box board which is stacked into cardboard is opened, and the bottom of the box is folded according to a certain procedure, and sealed with a tape and then delivered to the special equipment of the boxing machine. The working principle of the molding machine is similar to that of the syringe for injection. It uses the thrust of the screw (or plunger) to inject the plasticized molten state (ie, the viscous flow state) into the closed cavity. The process of obtaining the product after curing and setting.

The molding machine can be divided into:  carton forming machine, cartoning machine, paper cartoning machine, unloading machine, etc. according to the product series.

According to the degree of automation of the machine, it can be divided into: automatic molding machine, automatic carton forming machine and so on.