What is the working principle of Twin Screw Extrusion Machine

The twin screw extruder is mainly composed of two parallel screws and a barrel. The material enters the barrel from the hopper, and the two screws rotate at the same time. They can rotate in the same direction or in the opposite direction.
1. When the screw rotates
The first function is to convey. The screw ribs, like a screw conveyor, push the material forward along the axial direction of the barrel. Because it is a twin screw structure, the material is clamped and moved forward between the two screws and between the screw and the barrel wall, which can effectively prevent the material from stagnation or blockage in the barrel and ensure the continuous and stable conveying of the material.
2. During the conveying process
Accompanied by a strong mixing effect. If it is a meshing twin screw, the material will be repeatedly divided, flipped and recombined in the meshing area of ​​the screw. The two screws cooperate with each other to transfer the material from the screw groove of one screw to the screw groove of the other screw, thereby achieving a high degree of mixing between different material components. It is like using two constantly stirring spoons to fully mix the various raw materials together so that they are evenly distributed.
3. Heating and temperature rise
At the same time, the material is heated and heated by the shear heat generated by the heating device outside the barrel and the rotation of the screw. There are usually multiple heating zones on the barrel, and the temperature of different areas can be accurately controlled. As the temperature rises, the material gradually softens and plasticizes. For example, in plastic processing, solid plastic particles will become viscous flow. This plasticized material is pushed by the screw and passed through a specific mold, and finally extruded from the barrel to form a product with a certain shape, such as pipes, profiles, etc. Its shape and size are determined by the outlet shape of the mold, just like the dough is squeezed out of different shapes of biscuits through different shapes of decoration nozzles. The working principle of the twin screw extruder is a complex process involving conveying, mixing, heating plasticization and molding, which can efficiently process a variety of materials into the required products.
If you have any questions about the working principle of Twin Screw Extrusion Machine, please contact Wuxi East Point Machinery, our professional team will provide you with tailor-made solutions and comprehensive technical support.