For the production of small cross-sectional profiles such as sealing strips, single screw extruders or co extrusion are generally chosen for molding and processing to avoid the waste of production resources and energy. The selection of a single screw extruder depends on two main factors: first, the size of the product cross-section; The second is the production requirement. The larger the extrusion output, the larger the screw diameter; The larger the cross-sectional area (cross-sectional size) of the profiled material, the larger the diameter of the screw.The extrusion mold is the main component for product molding, which functions to continuously and uniformly transform the cylindrical melt provided by the extruder into a well plasticized mold that is similar to the channel cross-section and geometric dimensions. After further cooling and other processes, high-performance profiled products are obtained.