Because IXPE products are thin, such as the use of XPE/XLPE's horizontal and continuous foaming machine structure, it is prone to failures such as sticking or breaking during the foaming process. For this reason, our predecessors have specially developed a foaming machine structure that combines a horizontal furnace and a vertical furnace: the IXPE extruded mother sheet is preheated in the horizontal furnace section and enters the vertical furnace section when it is foamed. The IXPE extruded mother sheet is naturally It sags, and the blowing agent decomposes at high temperature, so that the IXPE extruded mother sheet expands naturally in the vertical foaming furnace, and a perfect IXPE foam product is obtained. The foaming furnace of this process is the IXPE vertical foaming furnace.