Determine the size of the packaging box and the internal shape of the paper. Suppose the article size is 150* 120*300. When designing the packaging box, we must consider the free space where the finished product is put into the box. We can preliminarily determine the width of the packaging development diagram as160+130+160+130. The width and bleeding location are temporarily not sealed here. According to the same principle, the height of the packing box is initially set to 3 10. The overall length, width and height of the packing box can be initially set as160 *130 * 310. ? According to the weight and density of the goods, choose the inner type of the carton board. Here, the cost must be considered. Suppose we choose 350g white cardboard, and the paper thickness is about 0.5mm 2. It is appropriate to design a suitable package development diagram according to the specific situation. Commonly used software, you can use AutoCAD to draw the expansion diagram. If this structure is confirmed and has been revised and finalized, dxf format can be directly exported from packmage as a tool template. Generally, the laser tool die-cutting machine will have its own cad plug-in, which can be used to play the bridge position and calculate the total length of the tool line and the total length of the broken line.