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What are the working principles of the co-rotating parallel twin-screw extruder?

by:TENGDA     2022-09-25

The working principle of the co-rotating parallel twin-screw extruder is generally divided into three parts: feeding section, compression section and extrusion section according to the change of the rubber material in the extrusion process. Extrusion molding is a process in which a plastic material with a certain plasticity is continuously pressed out through a mouth under certain conditions to make it a product with a certain cross-sectional shape. During the advance of the rubber material along the screw, due to the results of mechanical and thermal effects, the viscosity and plasticity of the rubber material have changed to a certain extent, and it has become a viscous fluid.


For the integral twin-screw, the length-diameter ratio is a fixed value, generally 7~18; for the combined twin-screw, the length-diameter ratio is variable, and some can reach 36. For nylon material, a screw with a slightly smaller aspect ratio can be used, so that the shearing is weaker, the fiber length in the reinforcing material is longer, and the performance is better. The longer the aspect ratio, the better the plasticizing effect, but it still depends on the specific material. The length-diameter ratio of the screw refers to the ratio of the effective length of the screw to the outer diameter, which reflects the specifications and performance of the twin-screw extruder. Different types of twin-screw extruders have different length-diameter ratio ranges.



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