The main body substrate of corn hot dog sausage packaging of Jiahe Industry (Suzhou) Co., Ltd. is a functional high barrier multilayer cast coextruded composite film. The innovation of the film (invention patent No.: ZL200410056120.6) is to solve the problem of large difference in heat resistance between heat-sensitive resin and non-thermosensitive resin (temperature difference of 50~300°C) through the multi-layer heat insulation principle of the equipment. Technical difficulties in processing. By using a combination of the number of resin layers, the material that does not pass heat resistance, and the thickness of the three elements, various materials having different heat resistance are integrated into a single unit, and the most effective combination of functions is achieved in one molding. The product packaging technology can be applied to six or more layers of co-extruded blow molding or co-extrusion tape molding of food or non-food products.