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Composition of twin-screw extruder

by:TENGDA     2023-01-26

The twin-screw extruder is composed of several parts such as the transmission device, the feeding device, the barrel and the screw. The effect of each part is similar to that of the single-screw extruder. Its structure is shown in Figure 1. The difference from the single-screw extruder is that there are two parallel screws in the twin-screw extruder placed in the '∞' shaped section of the material.

The twin-screw extruder used for profile extrusion is usually tightly meshed and counter-rotating, although a small amount also uses co-rotating twin-screw extruder, generally operated at a relatively low screw speed, about 10r/min .High-speed intermeshing co-rotating twin-screw extruder for compounding, venting or as a continuous chemical reactor.

The maximum screw speed of this type of extruder is planned to be 300-600r/min. The non-intermeshing extruder is used for mixing, venting and chemical reaction, and its conveying mechanism is quite different from that of the intermeshing extruder, which is closer to the single screw Although the conveying mechanism of the extruder is essentially different, after 500 hours of daily maintenance and use, there will be iron filings or other impurities from the gear grinding in the gearbox. Therefore, the gears should be cleaned and the lubricating oil of the gearbox should be replaced at the same time. .

After using it for a period of time, it is necessary to conduct a comprehensive inspection of the extruder to check the tightness of all screws. If the power is suddenly cut off during production, the main drive and heating are interrupted, and when the power supply is restored, each section of the barrel must be reheated to The extruder can only be started after the specified temperature has been kept for a period of time. If the surface and pointer are found to be fully turned, it should be checked whether the contact of the thermocouple and other lines is good.

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