The advantages of a parallel twin screw extruder are its plasticity and ability to adjust its length-to-diameter ratio. These features make it possible to increase its range of materials that it can extrude. Moreover, it features a conveying mechanism and good mixing, plasticization, and devolatilization capacity.
The diameter of a parallel twin screw extruder can be
injection molding screw adjusted according to the amount of plastic that will be extruded. In addition, there are two types of parallel twin screw extruders: conical and parallel twin screw. The former is designed to handle larger head pressures while the latter can accommodate smaller ones.
The diameter of a parallel twin screw barrel is larger than the diameter of a conical twin screw extruder. This means that it has a larger center distance and can accommodate larger radial and thrust bearings. However, the conical twin screw extruders are more expensive and more complex to operate. Moreover, they require a lot of space for the gears.
There are several different types of parallel twin screw barrel, each of which has unique characteristics. These types can be classified according to their outer diameter and effective part length. They can also be categorized according to the type of plastic they are used in. Some of these screws are generally nitrided and others have a bimetallic or carbide liner.
A good parallel twin screw barrel has a good plasticizing effect and a stable extrusion. In addition, the spiral surface is coated with a double-alloy-spray-welding process, which can extend its service life. Apart from this, it has a large load-bearing torque and low energy consumption. Furthermore, it is also made of good raw materials that ensure good wear resistance and long service life.
Twin-screw extruders have a large bearing capacity. They are easy to maintain, and their manufacturing costs are low. However, there are some disadvantages of twin-screw extruders, including a low output torque and poor load resistance. Nonetheless, they have a wide range of applications and performances. For example, intermeshing co-rotating twin-screw extruders are used for processing of non-thermally decomposable polymers. In addition, they can be used for screw-blending and plasticizing.
Different types of parallel twin screw barrels have different advantages and disadvantages. For example, one kind of parallel twin screw barrels has a small diameter, allowing for large radial and thrust bearings to be installed. Another type of parallel twin screw barrel is conical, which features two horizontally arranged screws. The center distance between the two axes gradually increases from the small end to the large end of the twin screw barrel.
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