extruder is a heat exchanger that stirs the feed liquid and cleans the heat transfer surface with the help of a scraper to speed up the heat transfer efficiency. The extruder is not only suitable for low viscosity feed liquid, but also suitable for high viscosity or particle-containing feed liquid for rapid heat exchange. High viscosity liquid due to high viscosity or slow flow, in ultra-high temperature sterilization treatment , the heat transfer surface of the general heat exchanger is easy to form a coking film, and the glue extruder is the most suitable. For example, in the production of aseptic packaged foods such as gelatin, dairy, tomato sauce, soybean milk and fruit juice, before the mechanical design of scraper heat exchanger, the physical properties of the feed liquid, the flow pattern of the feed liquid in the heat exchanger and the characteristics of heat transfer should be studied first, and the heat transfer coefficient, average temperature difference, fluid resistance and so on should be calculated. Obtaining the design parameters necessary for structural design to ensure the continuity of the production process and the treatment process to meet the requirements is a heat exchanger with the help of a scraper to stir the feed liquid and clean the heat transfer surface to speed up the heat transfer efficiency, the scraper heat exchanger is not only suitable for low viscosity feed liquid, especially for high viscosity or particle-containing feed liquid rapid heat exchange. The company according to different customer demand for production and customization of various types of extrusion machine.