The principle of the double screw squeezing machine is mainly through the interaction of two rotating screws to melt, mix, and extract solid materials. In the dual screw extruder, the two screws mesh each other during the rotation process, resulting in a strong mixing and shearing effect. The material enters the bucket of the dual screw extrusion machine, and under the action of the screw, it is brought into the tube of the extruder. In the tube, the rotation and meshing of the screw and the heating or cooling according to the material characteristics make the material melt or solidify.
When the material goes through a distance between the screws, the mixed and cut will occur, so that the key nodular between the material molecules will break and re -combine to form a uniform mixture. In this process, pressure will be continuously applied to the exit of the extrusion machine. The final product shape depends on the mold of the extruder. For example, the double screw extrusion machine for the production of plastic film will be installed on a cylindrical mold to form an unlimited length of plastic film.
Double screw extruders are mainly used in the plastic molding industry. For raw materials with high performance, high viscosity, and high -shaped temperature, such as PVC, PA, PC, PP, PE, etc. Essence Double screw extruders can fully mix the raw materials during the extrusion process, increase the degree of melting and melting uniformity, and reduce the decomposition and deterioration of the division during the extrusion process, thereby improving the extrusion efficiency and the quality of the finished product.
In addition, for rubber such as polymer materials, the extrusion processing is often limited by flowing and mixed, which affects the quality of the finished product. Compared with the single screw extrusion machine, the dual screw extruder has higher mixing and extrusion capabilities, which can reduce the temperature fluctuations and energy loss in the mixed process, improve the extrusion speed and the uniformity of the product shape. Especially for rubber materials with high hardness, high viscosity, high strength, and difficulty in processing difficulty, it has better processing performance.
The two screw extruders have the principle of extrusion machine for single screw extrusion machines, including steps such as solid transportation, melting, supercharged and pumping, mixing, steam lifting, and disassembly. However, the dual screw extruder is not simply a combination of these steps, but organically combines each step through the special working method of dual screw to form a continuous production process.
