Jiangnan Drying Cylinder Company produces a series of electric heating roller products mainly used in the specialty paper and printing industries. Adopting a double-layer structure, the thermal oil is heated by an electric heating rod without the need for external heating equipment. In addition, the shaft end adopts slip ring conductivity and an external oil level expansion groove to ensure stable operation; The temperature difference on the cylinder surface is less than 2 ℃, and the color difference of the product is consistent. It has the characteristics of saving investment, energy, and green environmental protection, and is a must-have product for economically developed areas to replace boiler steam heating. It can also be designed as an external circulation heating method as needed.