By virtue of its superior performance, single screw extruder has been widely used over the years. It can be used for processing a variety of plastic products, such as blown film, squeeze tubes, plate, roberts belt and also can be used for melting granulation.
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Advantages of single screw extruder. Designed by advanced technology, it has good plasticizing function to ensure stable and high speed extrusion. The entire process is involved with involute gear transmission so it cause low noise and can bear large capacity.
Disadvantages of single screw extruder. The transmission of materials in single screw extruder is mainly by friction, so that the feeding performance is limited. Powder, paste materials, glass fiber and inorganic filler is more difficult to join which is not suitable for some processes. In addition, single screw extruder has small effect on the surface of exhaust gas area thus the poor exhaust effect.
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Prev NewsSingle screw extruder and twin screw extruder have their own characteristics and applications. In some applications, you can choose either single screw or twin screw.
Extruder can be used in plastics industry, food & Pet food industry, chemicals industry, Pharmaceutical, Minerals and Nonwovens industry. This guide mainly introduces the plastic extruder.
Let’s introduce in detail what are the advantages and differences between single-screw and twin-screw extruders.
Single screw extruder means that there is only one screw in the extruder barrel.
It is mainly composed of three parts: extrusion system, transmission system and heating and cooling system. Its basic structure is shown in Figure 1.
The main function of the extrusion system is to melt and plasticize the polymer material to form a uniform melt, and realize the transition from the glass state to the viscous fluid state.
The extrusion system mainly includes feeding system, screw and barrel. It is the core part of the extruder, and the screw is the key core component of the extruder.
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The transmission system is usually composed of a motor, a reducer and a bearing. Its function is mainly to drive the screw and supply the torque and torque required by the screw in the extrusion process.
During the extrusion process, the screw speed is required to be stable to ensure uniform product quality. However, under different circumstances, the screw speed needs to be adjustable so that the same equipment can be adapted to extrude different materials or different shapes products.
The heating and cooling system of the extruder consists of a heating device and a cooling device, which is a necessary condition for the smooth operation of the extrusion process. The heating device and cooling device must ensure that the temperature conditions meet the process requirements.
The twin-screw extruder is developed on the basis of the single-screw extruder. Due to its good feeding performance, mixing and plasticizing performance, exhaust performance, extrusion stability, etc., it has been widely used in extruded products. Forming processing.
There are two types of twin-screw extruders: intermeshing and non-intermeshing. And, Intermeshing twin screw extruders have two types: co-rotating and counter-rotating.
There are many types of twin-screw extruders, and the equipment under various applications has very different characteristics.
For example, the intermeshing counter-rotating twin-screw extruder is excellent in the main application areas of pipe and profile extrusion, especially for PVC materials.
For applications related to compounding and reactive extrusion, the building block self-cleaning co-rotating twin-screw extruder is more excellent and widely used.
In general, the single screw extruder is developing in the direction of high speed, high efficiency and specialization. The twin-screw extruder has good feeding characteristics and is suitable for powder processing. It has better mixing, venting, reaction and self-cleaning functions than the single-screw extruder. When processing plastics and blends with poor thermal stability It also shows its superiority.
Although there are indeed many differences between single and twin screw extruders, they can also be used for some of the same applications, or they can be used in combination. So how should we choose a plastic extruder?
Generally speaking, within the budget, choose the most cost-effective equipment according to the application requirements.
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