Principle of single screw extruder
Release time:
2024-07-20
The single screw is generally divided into three sections in the effective length, and the effective length of the three sections is determined according to the diameter of the screw, the pitch and the depth of the screw, and generally accounts for one-third of each. The last thread of the material mouth began to be called the conveying section: the material is required to not be plasticized here, but it must be preheated and compacted under compression, in the past, the old extrusion theory believed that the material here is a loose body, and later proved that the movement of the material here is similar to a solid piston, so as long as the conveying task is completed, it is its function. The second section is called the compression section, at this time the volume of the screw groove gradually decreases from large, and the temperature should reach the degree of plasticization of the material, where the compression is generated by the conveying section three, here the compression to one, which is called the compression ratio of the screw - 3:1, some machines also change, and the plasticized material enters the third section. The third section is the metering section, where the material maintains the plasticization temperature, but the melt material is conveyed accurately and quantitatively like a metering pump to supply the machine head, and the temperature cannot be lower than the plasticizing temperature, which is generally slightly higher.
The single screw is generally divided into three sections in the effective length, and the effective length of the three sections is determined according to the diameter of the screw, the pitch and the depth of the screw, and generally accounts for one-third of each.
The last thread of the material mouth began to be called the conveying section: the material is required to not be plasticized here, but it must be preheated and compacted under compression, in the past, the old extrusion theory believed that the material here is a loose body, and later proved that the movement of the material here is similar to a solid piston, so as long as the conveying task is completed, it is its function.
The second section is called the compression section, at this time the volume of the screw groove gradually decreases from large, and the temperature should reach the degree of plasticization of the material, where the compression is generated by the conveying section three, here the compression to one, which is called the compression ratio of the screw - 3:1, some machines also change, and the plasticized material enters the third section.
The third section is the metering section, where the material maintains the plasticization temperature, but the melt material is conveyed accurately and quantitatively like a metering pump to supply the machine head, and the temperature cannot be lower than the plasticizing temperature, which is generally slightly higher.
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