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Single Screw Extruder Screw and Barrel manufacturers take you to understand the design structure and working principle of single screw extruder
Single Screw Extruder Screw and Barrel manufacturers tell you that plastic extruders are divided into single screw extruders, twin screw extruders, and multi-screw extruders. Extruders include screws, barrels, hoppers, heads, and molds. The plastic is plasticized into a homogeneous melt by the extrusion system, and under the pressure established in the process, it is continuously extruded by the screw head.
Single Screw Extruder Screw and Barrel manufacturers tell you that the screw of the single screw extruder is divided into conveying section, compression section and metering section.
Conveying section: The plastic enters the barrel of the extruder from the hopper. Under the rotation of the screw, it moves forward due to the friction between the inner wall of the barrel and the surface of the screw. The manufacturer of Single Screw Extruder Screw and Barrel tells you in this section that the main function of the screw is to compact the plastic to provide the driving force for forward conveying. The plastic in contact with the inner wall of the cylinder has approached or reached the viscous flow temperature, and the surface of the solid particles has started to become sticky, but the melting has not yet begun. The manufacturer of Single Screw Extruder Screw and Barrel tells you that this area is called the hysteresis area, which refers to the viscous flow state from the end of the solid conveying area to the beginning of melting.
Compression section: The volume of the screw groove gradually becomes smaller, and the temperature must reach the plasticization level of the material. The compression is generated here from the third conveying section, and it is compressed to one here. This is called the compression ratio of the screw--3:1. Some There are also changes in the machine, and the plasticized material enters the third stage.
Metering section: The material maintains the plasticizing temperature here, just like a metering pump to accurately and quantitatively transport the melt material to supply the machine head. At this time, the temperature cannot be lower than the plasticizing temperature, generally slightly higher. The manufacturer of Single Screw Extruder Screw and Barrel tells you that the material from the melting section to the perfusion section is a viscous fluid that has been completely melted. The manufacturer of Single Screw Extruder Screw and Barrel tells you that the viscous fluid conveyed forward is further mixed and plasticized under the resistance of the die of the die, and part of it is extruded from the die of the die at a constant pressure.