Difference Between Twin Screw and Single Screw Extruder
Advantages of single screw extruder: single screw extruder has advanced design, high quality, good plasticization, low energy consumption, low noise, stable operation, large bearing capacity and long life.
The single-screw extruder adopts a two-stage overall design to strengthen the plasticization function to ensure high-speed, high-performance and stable extrusion.
The special barrier comprehensive mixing design ensures the mixing effect of the material, and the high shear and low melting temperature are guaranteed. High-performance low-temperature low-pressure metering extrusion of materials.
In addition, the single-screw extruder is cheap in design, so the single-screw extruder is widely used.
However, the single screw extruder has its limitations in use. The single screw extruder is mainly manifested in the following aspects.
The material conveying of the single screw extruder mainly depends on friction, which limits the feeding performance of the single screw extruder. It is difficult to add materials, paste materials, glass fibers and inorganic fillers;
When the head pressure of the single-screw extruder is high, the countercurrent increases, which reduces the productivity of the single-screw extruder; The exhaust effect is poor;
Single-screw extruders are not suitable for certain processes, such as polymer coloring, thermosetting powder processing, etc.
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Compared with single-screw extruder, twin-screw extruder has many advantages in reducing production cost and improving production efficiency, as follows.
Reduce production costs: When manufacturing masterbatch, it is often necessary to change the color. If it is necessary to change the product, open the open processing area within a few minutes. In addition, the mixing process can be performed by observing the melt profile on the entire screw. analyze.
At present, the common twin-screw extruder needs a large amount of cleaning material to clean the machine when changing the color, which is time-consuming, energy-consuming, and waste of raw materials.
The split twin-screw extruder can solve this problem. When changing the color, it only takes a few minutes to quickly open the barrel for manual cleaning, so that no or less cleaning materials can be used, which saves costs.
Improve production efficiency: In equipment maintenance, ordinary twin-screw extruders often have to remove the heating and cooling systems first, and then take out the screw as a whole.
The split twin-screw extruder does not need to be. Just loosen a few bolts and turn the worm gear box handle to lift the upper part of the barrel to open the entire barrel and then perform maintenance.
This not only shortens the maintenance time, but also reduces the labor intensity.
Wear conditions: The twin-screw extruder is easy to open, so the wear level of the threaded elements and the inner liner of the barrel can be found at any time, so that effective maintenance or replacement can be carried out.
It will not be discovered when there is a problem with the extruded product, causing unnecessary waste.
High torque and high speed: At present, the development trend of twin-screw extruders in the world is toward high torque, high speed, and low energy consumption. The effect of high speed is high productivity.
The split twin-screw extruder belongs to this category, and its speed can reach 500 rpm. Therefore, it has unique advantages in processing high-viscosity, heat-sensitive materials.
In addition, the twin-screw extruder has the advantages of a wide range of applications and can be applied to the processing and production of a variety of materials.