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​The difference between single and twin screw extruders

by:TENGDA     2023-02-09
​The difference between single and twin screw extruders

Let's take a look at the differences between the two extruders in terms of price, operability, and screw.

​The difference between single and twin screw extruders​

1. The price of single screw is lower
Single-screw extruder has simple structure and low price;
The twin-screw structure is complicated and the price is high. Twin-screw extruders are about twice as expensive as single-screw extruders. Some will be higher, depending on the manufacturer and model specifications.

2. Single-screw formula is simple
Frankly speaking, in terms of actual operation, the gap between the two is actually not very big. However, the processing technology and formula of the single-screw extruder are relatively simple, while the processing technology, processing technology and formula of the twin-screw extruder will be more complicated.

3. The twin-screw can be matched with the screw at will
The external threads of the twin-screw can be formed into external threads at will according to the condition of the material and the mood of the operator. In short, you are happy;
A single screw will be more rigid and cannot be combined into a screw.

4. The twin-screw is more efficient
The twin-screw extruder has a large production capacity, faster extrusion speed, and low energy consumption for the production capacity of the enterprise, while the single-screw extruder is worse. The efficiency of the twin-screw extruder is almost twice that of the single-screw extruder. Actual depends on the manufacturer, model and specification.

5. Twin-screw rubber compound has strong melting ability
To put it simply, the single screw is suitable for the melt extrusion of polymers and the extrusion processing of granular materials, such as: forming, blown film, injection molding, etc., and the application of raw materials covers a wide range;
The twin-screw extruder has good mixing rubber melting ability, which is more suitable for the modified material of plastic products. And the twin-screw extruder can produce two colors.

6. Single screw is good for maintenance
In terms of maintenance, single-screw is simpler than twin-screw, because the structure of single-screw is very simple, which is convenient for maintenance.

7. Belt conveyor mechanism
The key to the transportation of the single-screw extruder is the sliding friction between the raw material and the barrel. The machine also has a cutting effect on the raw material at the meshing place of the two screws. (for counter-rotating twin-screw extruders)

8. Velocity field
The speed distribution in the single-screw extruder is relatively clear and easy to describe, while the situation in the counter-rotating twin-screw extruder is very complicated and difficult to describe. This is mainly because the screw has a toothing area, and the complex fluidity generated in the toothing area makes it have many advantages such as sufficient mixing, uniform heat convection, strong melting ability, and excellent exhaust pipe characteristics, but the toothing cannot be accurately analyzed. mobility in the area. (for counter-rotating twin-screw extruders)

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