What are the names and functions of the three sections of the single-screw extruder screw?

1. feeding section: its function is to transport raw materials to the later stage.

The feeding section, also known as the conveying section, has the same pitch and the same screw depth, that is, the screws are equidistant and the depth is equal.

2. Compression section: used to compress and melt materials and build up pressure.

In the compression section, also known as the migration section, the screws are equidistant and unequal in depth. In order to adapt to the change of material state, the volume of spiral slag gradually becomes smaller.

3. Homogenization section: It is used to extrude the molten material in the compression section to the front end of the screw at a fixed temperature.

In the homogenization section, also known as the metering section, the screws are equidistant and the depth is equal, but the depth of the spiral groove is shallow.

Extended data

Advantages and disadvantages of single screw extruder

Advantages: Single screw extruder has simple design, low price and wide application.

Disadvantages:

The feeding performance of (1) single-screw extruder is limited by friction, so it is difficult to add powder, paste, glass fiber and inorganic filler.

(2) When the pressure head is high, the countercurrent increases, which reduces the productivity.

(3) The material of the single-screw exhaust extruder has little surface renewal effect in the exhaust area, so the exhaust effect is poor.

(4) Single screw extruder is not suitable for some technological processes, such as polymer coloring and thermosetting powder processing.

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