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Design features of twin-screw extruder
Due to the complex geometry of the twin-screw extruder and the many factors affecting the production capacity and power consumption of the twin-screw extruder, there are many design parameters for the twin-screw extruder. For example, for the circular conveying section, the geometric parameters that affect Q include Db, θb, H, W, e, etc. These parameters affect the temperature rise, moving angle and pressure of the material under certain conditions. In addition, the extrusion parameters are derived based on the solid mechanical motion. If the melting film phenomenon of the material near the surface of the screw and barrel is considered during the motion process, the design variables involved will be more and more complicated.
2. Multiple optimization goals
As mentioned earlier, the functions of each section of the twin-screw extruder are different, so there are large differences in the corresponding optimization goals. And for any section, there are also situations of multiple optimization objectives. For example, the circular conveying section requires high conveying efficiency of the screw, small fluctuations in conveying rate, and low energy consumption; for the melting section, high melting rate is required, that is, high energy conversion and transfer efficiency; for the metering section, except In addition to high productivity and low energy consumption, smooth extrusion and high quality of extruded products are also expected. In addition, for manufacturers of twin-screw extruder accessories in batches, there is still a problem of how to save the screw material as much as possible on the premise of ensuring the working performance and strength and rigidity of the screw.
3. Many constraints
Mechanical optimization design is the process of establishing a mathematical model according to predetermined optimization goals and design requirements, determining constraints according to work requirements and conditions, and then selecting an optimization method to find the best design solution. The optimal design of the screw not only needs to meet the conditions of strength and width, but also needs to meet the conditions of the polymer molding process, which leads to many constraints on the design model and increases the difficulty of optimization. In summary, there are many design parameters and optimization Many objectives and many constraints constitute the main characteristics of twin-screw extruder optimization design, and lead to the complexity of the optimization process. Further studies have found that the above characteristics are also the common characteristics of the optimal design of polymer material processing machinery.
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