Generally, a twin-screw extruder is composed of several structures such as a feeding device, a screw, a transmission device and a barrel, and the function of each component is basically similar to that of a single-screw extruder. The difference from the single-screw extruder is that there are two parallel screws in the same barrel in the twin-screw extruder.
There are many different types of twin-screw extruders. The main difference lies in the screw structure. The screw structure of the twin-screw extruder is much more messy than the single-screw extruder, because the screw of the twin-screw extruder also has such things as the direction of rotation and the degree of meshing.
The twin-screw extruders commonly used for PVC profile extrusion are usually tightly meshed and counter-rotating screws. A small number of them are also extruded with co-rotating twin-screws, but they can only be operated at low speeds, about 10r/min. Within range. The high-speed intermeshing co-rotating twin-screw extruder is used for mixing, venting and granulating or as a continuous chemical reactor. The larger screw speed of this type of extruder ranges from 300 to 600 r/min. The conveying mechanism of non-intermeshing extruder and intermeshing extruder is quite different. Compared with the conveying mechanism of single-screw extruder, the two are essentially different.
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