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What are the advantages of twin-screw extruders? How many types are there?

by:TENGDA     2022-12-19
Twin-screw extruder, as the name suggests, should be further developed on the basis of single-screw extruder. Compared with the previous generation, it has better feeding performance, exhaust performance and extrusion stability. The previous generation was wider. So what are the specific advantages of twin-screw extruders? How many categories does it have? In the next article, TENGDA Plastic Extruder Machine Manufacturers will answer you one by one.

Advantages of twin-screw extruders:

1. Wear condition

Since it is easy to open, the degree of wear of the threaded elements and the inner bushing of the machine barrel can be found at any time, so as to carry out effective maintenance or replacement. It will not be discovered when there is a problem with the extruded product, causing unnecessary waste.

2. Reduce production costs

When manufacturing master batches, it is often necessary to change the color. If it is necessary to change the product, the open processing area can be opened within a few minutes. In addition, the mixing process can be analyzed by observing the melt profile on the entire screw. At present, when changing the color of an ordinary twin-screw extruder, a large amount of cleaning materials are required to clean the machine, which is time-consuming, power-consuming, and wastes raw materials.

The split-type twin-screw extruder can solve this problem. When changing colors, the barrel can be quickly opened for manual cleaning in a few minutes, so that no or less cleaning materials are used, which saves costs.

3. Improve labor efficiency

During equipment maintenance, the common twin-screw extruder often needs to remove the heating and cooling system first, and then pull out the screw as a whole. The split twin-screw is not used, as long as a few bolts are loosened, the handle device of the worm gear box is turned to lift the upper half of the barrel to open the whole barrel for maintenance. This not only shortens the maintenance time, but also reduces the labor intensity.

4. High torque, high speed

At present, the development trend of twin-screw extruders in the world is to develop in the direction of 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 plus 500 rpm. Therefore, it has unique advantages in processing high-viscosity and heat-sensitive materials.

Regarding the core technology of high speed and high torque, currently only German and Japanese manufacturers have mastered the core technology of asymmetric and symmetrical high torque gearboxes, and the maximum speed can reach more than 1800 rpm.

5. Wide range of applications

It has a wide range of applications and can be applied to the processing of various materials

6. High output and high quality

It has other advantages of ordinary twin-screw extruders, and can achieve high output, high quality and high efficiency.

Classification of twin-screw extruders:

According to the rotation direction of the twin-screw, the extruder can be divided into two kinds of extruders in the same direction and different directions. The same direction extruder means that the two screws rotate in the same direction when they work. The direction of rotation is opposite when working.

According to whether the axes of the twin-screws are parallel or not, it can be divided into two kinds of extruders, the ones with parallel axes and the ones with intersecting axes. The one whose axes are parallel is a twin-screw extruder, and the one whose axes intersect is a conical twin-screw extruder.

Twin-screw extruders are also divided into intermeshing and non-meshing.

The similarities between parallel and conical twin-screw extruders: they have a conveying mechanism for forcing plastics forward, good mixing and plasticizing capabilities and dehydration capabilities, and basically the same adaptability to materials and plastic product molding processes.

The above is the introduction of the advantages and classification of the twin-screw extruder, I hope it will be helpful to everyone.
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