The extruder screw barrel is the molding processing method with the most varieties, the most changes, the high productivity, the strong adaptability, wide range of uses and the largest proportion of output in the field of polymer processing.
Ⅰ. Specifications of extruder screw barrel
1. Diameter: Ф16-Ф300.
2. Aspect ratio: L/D=15-40.
3. Common material: 38crMoAIA. Quenching and tempering, qualitative and nitriding treatment. Surface hardness: HV≥900. Depth of nitride layer: 0.5-0.8mm.
4. Common materials: WC/CO overall spray welding on the surface can effectively improve the service life of the extruder screw.
Ⅱ. Structural characteristics of extruder screw barrel
1. The structure of the extruder screw barrel is simple and the price is low.
2. It is suitable for plasticizing extrusion of polymers and extrusion processing of pellets. It has little shear degradation of the polymer, but the material stays in the extruder for a long time.
3. The extruder screw barrel is easy to operate and the process control is simple.
4. It has good mixing and plasticizing ability, and the material stays in the extruder for a short time, which is suitable for powder processing.
5. The output of the extruder screw barrel is large. The extrusion speed is fast and the output energy consumption is low.
Ⅲ. The structure of the extruder screw is suitable for
PVC wire and cable extrusion, PVC gusset extrusion, PVC profile extrusion, PVC pipe extrusion (containing calcium powder), PVC sheet extrusion, PVC sheet extrusion, PVC granulation extrusion, PVC blown film extrusion, etc.
For PVC blown film extrusion: One is direct extrusion blow molding with powder. The extruder screw used in this method has a large aspect ratio. The screw metering section is long, the groove depth is shallow and the compression ratio is large. In addition, the feeding section is equipped with forced water cooling and the screw has a strong ability to extract materials, so that the plasticization is good and there is a certain head pressure to meet the needs of film blowing. One is an ordinary extrusion film blowing unit, which uses pellets to blow film, but adds a pelletizing process.
Extruder screw, different types of screws are selected for different products. It has high output and good plasticization.
Our conveying screw element is a self-sweeping extruder screw assembly, which opens longitudinally and closes laterally, and has a strong conveying effect. It has short material residence time, good self-cleaning and can build up high pressure in a short axial distance.
The conveying element is mainly of threaded construction. Its function is to transport the material and give the material a certain thrust, so that the material can overcome the resistance encountered in the flow channel. The extruder screw elements are the most popular extruder screw element at present. It has strong conveying function, short residence time and good self-cleaning.
In terms of production specifications, LESUN not only provides general extruder screws and standard twin screw extruder accessories produced by manufacturers, but also provides design and manufacturing services for special extruder accessories according to customer requirements. At the same time, we also provide surveying and mapping business and processing business of accessories for major extrusion press companies. If you are in need, welcome to contact us.
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