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What is the working principle of twin screw extrusion granulator?

by:TENGDA     2022-10-02

The twin-screw granulator is composed of several parts such as a transmission device, a feeding device, a barrel and a screw, and the functions of each part are similar to that of a single-screw granulator. The difference from the single-screw granulator is that there are two parallel screws placed in the same barrel in the twin-screw granulator.

The twin-screw granulator commonly used in the extrusion of PVC profiles is usually closely intermeshing and counter-rotating screws, and a small amount of co-rotating twin-screw extrusion is also used, but usually it can only be operated at low speed, about 10r/min. within the range. The high-speed meshing co-rotating twin-screw granulator is used for mixing, exhaust granulation or as a continuous chemical reactor. The maximum screw speed of this type of extruder ranges from 300 to 600 r/min. The conveying mechanism of the non-intermeshing extruder and the intermeshing extruder is very different. Compared with the conveying mechanism of the single-screw granulator, the two are essentially different.

Twin-screw extruder granulator polymer in the extrusion process of changing laws, conveying principles of solid melt conveying and exhausting truth and laws, establish a mathematical and physical model to guide the design of twin-screw extruder and optimization of the extrusion process. As a twin-screw extruder, the internal relationship between the reaction process, speed, performance and screw configuration and operating conditions during reaction molding is extruded, and a model is established to guide the reaction molding extrusion. It is necessary to find out the real state change of two or more polymers and materials during the extrusion process, the mixing form, the process of structural change, and the relationship between the final mixture and performance.

There are many different forms of twin-screw granulator, and the difference lies in the structure of the screw. The screw structure of the twin-screw granulator is much more complicated than that of the single-screw extruder, because the screw of the twin-screw granulator also has rotation direction, degree of meshing, etc.

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