As a common extruder equipment, single-screw extruder is used in the plastic processing industry.
What is the principle and structure?
The following is an analysis of the principle of the single-screw extruder from the conveying section, compression section, and metering section of the extruder.
The single-screw extruder is generally divided into three sections in terms of effective length. The effective length of the three sections is determined according to the size of the screw diameter, the pitch, and the depth of the screw.
The high-efficiency single-screw extruder adopts a two-stage overall design to strengthen the plasticization function to ensure high-speed, high-performance and stable extrusion. The special barrier comprehensive mixing design ensures the mixing effect of the material, high shear and low melting temperature and ensures high-performance low-temperature low-pressure metering extrusion of materials.
Design concept and characteristics: High-speed and high-yield extrusion based on high flatness and straightness.
Principle of single screw extruder
After the feed port, a thread starts which is called conveying section and the material cannot be plasticized here, and it must be preheated and compacted. In the past, the old extrusion theory believed that the material here was loose. Later, it was proved that the material here is actually like the solid plug which means that the material here is a solid like a plug after being squeezed, so as long as the conveying task is completed, that’s its function.
Principle of single-screw extruder: The second section is called compression section. At this time, the volume of the screw groove is gradually reduced from large, and the temperature must reach the degree of plasticization of the material, and it is compressed to a certain ratio here. This is called the compression ratio of the screw. There are also changes among different machines. The plasticized material will enter the third stage after finishing the step.
Principle of single screw extruder: The third section is the metering section. The material here maintains the plasticizing temperature, 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 single-screw extruder is mainly used for extruding soft and hard PVC, polyethylene and other thermoplastic plastics. It can process a variety of plastic products, such as films, tubes, plates, ribbons, etc. And it can also be used for granulation.
The plastic extruder has reasonable design, high quality, good plasticization, low energy consumption, adopts involute gear transmission, and has the characteristics of low noise, stable operation, large bearing capacity and long life.
Pipe extrusion: suitable for PP-R pipes, PE gas pipes, PEX cross-linked pipes, aluminum-plastic composite pipes, ABS pipes, PVC pipes, HDPE silicon core pipes and various co-extruded composite pipes.
Sheet and sheet extrusion: suitable for the extrusion of PVC, PET, PS, PP, PC and other profiles and sheets. Suitable for extrusion of various other plastics such as silk, rods, etc. Suitable for extrusion of profiles: by adjusting the speed of the extruder and changing the structure of the extruder screw can be applied to the production of various plastic profiles such as PVC and polyolefins. Modified granulation: It is suitable for blending, modifying and enhancing granulation of various plastics.
Pipe extrusion: suitable for PP-R pipes, PE gas pipes, PEX cross-linked pipes, aluminum-plastic composite pipes, ABS pipes, PVC pipes, HDPE silicon core pipes and various co-extruded composite pipes.
Sheet and sheet extrusion: suitable for the extrusion of PVC, PET, PS, PP, PC and other profiles and sheets. Suitable for extrusion of various other plastics such as silk, rods, etc. Suitable for extrusion of profiles: by adjusting the speed of the extruder and changing the structure of the extruder screw can be applied to the production of various plastic profiles such as PVC and polyolefins. Modified granulation: It is suitable for blending, modifying and enhancing granulation of various plastics.
General technical parameters
| Product Name | Screw diameter (mm) |
L/D | Motor power kW |
output Torque(N.M) |
Screw speed (r/min) |
Max output (kg/h) |
| GWS 25/25 | 25 | 25:1 | 1.5 | 175 | 100 | 3.4 |
| GWS 30/25 | 30 | 25:1 | 5.5 | 410 | 125 | 12.5 |
| GWS 45/25 | 45 | 25:1 | 7.5 | 580 | 100 | 20 |
| GWS 45/30A | 45 | 30:1 | 15 | 1000 | 145 | 40 |
| GWS 45/30C | 45 | 30:1 | 30 | 1600 | 185 | 120 |
| GWS 65/25 | 65 | 25:1 | 22 | 1500 | 100 | 60 |
| GWS 65/30 | 65 | 30:1 | 30:1 | 3600 | 105 | 80 |
| GWS 65/30 | 65 | 30:1 | 45 | 4800 | 120 | 120 |
| GWS 75/32 | 75 | 32:1 | 90 | 7200 | 120 | 350 |
| GWS 90/25 | 90 | 25:1 | 55 | 4400 | 120 | 150 |
| GWS 90/30 | 90 | 30:1 | 90 | 9200 | 94 | 250 |
| GWS 90/32 | 90 | 32:1 | 160 | 13000 | 120 | 500 |
| GWS 120/25 | 120 | 25:1 | 90 | 9200 | 94 | 350 |
| GWS 120/30 | 120 | 30:1 | 110 | 16000 | 94 | 350 |
| GWS 120/33 | 120 | 33:1 | 250 | 25000 | 94 | 800 |
| GWS 150/25 | 150 | 25:1 | 110 | 35000 | 40 | 320 |
| GWS 150/30 | 150 | 30:1 | 132 | 36000 | 50 | 350 |
| GWS 150/34 | 150 | 34:1 | 315 | 32000 | 75 | 1100 |
| GWS 200/25 | 200 | 25:1 | 160 | 50000 | 30 | 500 |
| GWS 200/30 | 200 | 30:1 | 200 | 60000 | 40 | 550 |
| GWS 200/34 | 200 | 34:1 | 400 | 55000 | 75 | 1500 |
As a common extruder equipment, single-screw extruder is used in the plastic processing industry.
What is the principle and structure?
The following is an analysis of the principle of the single-screw extruder from the conveying section, compression section, and metering section of the extruder.
The single-screw extruder is generally divided into three sections in terms of effective length. The effective length of the three sections is determined according to the size of the screw diameter, the pitch, and the depth of the screw.
The high-efficiency single-screw extruder adopts a two-stage overall design to strengthen the plasticization function to ensure high-speed, high-performance and stable extrusion. The special barrier comprehensive mixing design ensures the mixing effect of the material, high shear and low melting temperature and ensures high-performance low-temperature low-pressure metering extrusion of materials.
Design concept and characteristics: High-speed and high-yield extrusion based on high flatness and straightness.
Principle of single screw extruder
After the feed port, a thread starts which is called conveying section and the material cannot be plasticized here, and it must be preheated and compacted. In the past, the old extrusion theory believed that the material here was loose. Later, it was proved that the material here is actually like the solid plug which means that the material here is a solid like a plug after being squeezed, so as long as the conveying task is completed, that’s its function.
Principle of single-screw extruder: The second section is called compression section. At this time, the volume of the screw groove is gradually reduced from large, and the temperature must reach the degree of plasticization of the material, and it is compressed to a certain ratio here. This is called the compression ratio of the screw. There are also changes among different machines. The plasticized material will enter the third stage after finishing the step.
Principle of single screw extruder: The third section is the metering section. The material here maintains the plasticizing temperature, 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 single-screw extruder is mainly used for extruding soft and hard PVC, polyethylene and other thermoplastic plastics. It can process a variety of plastic products, such as films, tubes, plates, ribbons, etc. And it can also be used for granulation.
The plastic extruder has reasonable design, high quality, good plasticization, low energy consumption, adopts involute gear transmission, and has the characteristics of low noise, stable operation, large bearing capacity and long life.
Pipe extrusion: suitable for PP-R pipes, PE gas pipes, PEX cross-linked pipes, aluminum-plastic composite pipes, ABS pipes, PVC pipes, HDPE silicon core pipes and various co-extruded composite pipes.
Sheet and sheet extrusion: suitable for the extrusion of PVC, PET, PS, PP, PC and other profiles and sheets. Suitable for extrusion of various other plastics such as silk, rods, etc. Suitable for extrusion of profiles: by adjusting the speed of the extruder and changing the structure of the extruder screw can be applied to the production of various plastic profiles such as PVC and polyolefins. Modified granulation: It is suitable for blending, modifying and enhancing granulation of various plastics.
Pipe extrusion: suitable for PP-R pipes, PE gas pipes, PEX cross-linked pipes, aluminum-plastic composite pipes, ABS pipes, PVC pipes, HDPE silicon core pipes and various co-extruded composite pipes.
Sheet and sheet extrusion: suitable for the extrusion of PVC, PET, PS, PP, PC and other profiles and sheets. Suitable for extrusion of various other plastics such as silk, rods, etc. Suitable for extrusion of profiles: by adjusting the speed of the extruder and changing the structure of the extruder screw can be applied to the production of various plastic profiles such as PVC and polyolefins. Modified granulation: It is suitable for blending, modifying and enhancing granulation of various plastics.
General technical parameters
| Product Name | Screw diameter (mm) |
L/D | Motor power kW |
output Torque(N.M) |
Screw speed (r/min) |
Max output (kg/h) |
| GWS 25/25 | 25 | 25:1 | 1.5 | 175 | 100 | 3.4 |
| GWS 30/25 | 30 | 25:1 | 5.5 | 410 | 125 | 12.5 |
| GWS 45/25 | 45 | 25:1 | 7.5 | 580 | 100 | 20 |
| GWS 45/30A | 45 | 30:1 | 15 | 1000 | 145 | 40 |
| GWS 45/30C | 45 | 30:1 | 30 | 1600 | 185 | 120 |
| GWS 65/25 | 65 | 25:1 | 22 | 1500 | 100 | 60 |
| GWS 65/30 | 65 | 30:1 | 30:1 | 3600 | 105 | 80 |
| GWS 65/30 | 65 | 30:1 | 45 | 4800 | 120 | 120 |
| GWS 75/32 | 75 | 32:1 | 90 | 7200 | 120 | 350 |
| GWS 90/25 | 90 | 25:1 | 55 | 4400 | 120 | 150 |
| GWS 90/30 | 90 | 30:1 | 90 | 9200 | 94 | 250 |
| GWS 90/32 | 90 | 32:1 | 160 | 13000 | 120 | 500 |
| GWS 120/25 | 120 | 25:1 | 90 | 9200 | 94 | 350 |
| GWS 120/30 | 120 | 30:1 | 110 | 16000 | 94 | 350 |
| GWS 120/33 | 120 | 33:1 | 250 | 25000 | 94 | 800 |
| GWS 150/25 | 150 | 25:1 | 110 | 35000 | 40 | 320 |
| GWS 150/30 | 150 | 30:1 | 132 | 36000 | 50 | 350 |
| GWS 150/34 | 150 | 34:1 | 315 | 32000 | 75 | 1100 |
| GWS 200/25 | 200 | 25:1 | 160 | 50000 | 30 | 500 |
| GWS 200/30 | 200 | 30:1 | 200 | 60000 | 40 | 550 |
| GWS 200/34 | 200 | 34:1 | 400 | 55000 | 75 | 1500 |
