|
| Mixing characteristics of materials extruded by coaxial twin screw extruder |
| |
| DOI：10.19902/j.cnki.zgyz.1003-7969.240206 |
| KeyWord:extruder screw mixing characteristics internal flow field viscous fluid |
| FundProject:国家重点研发计划（2023YFD2400502） |
| Author Name | Affiliation | | XIA Weijie1, MA Liang2, ZHANG Jun1, SHEN Chunyun1 | 1.College of Engineering, Shanghai Ocean University, Shanghai 201306, China
2.Bühler Changzhou Machinery Co. , Ltd. , Changzhou 213332, Jiangsu, China |
|
| Hits: 6 |
| Download times: 4 |
| Abstract: |
| To improve the material mixing uniformity and extrusion efficiency of coaxial twin screw extruder, the influence mechanisms of different screw structures on the material extrusion process were investigated. Firstly, the four screw structure models of common thread with/without meshing block and grooved thread with/without meshing block were established; then, a three-dimensional internal flow field numerical calculation model was established on the basis of the experimental verification of the grid independence and the validity of the calculation method; finally, the flow field pressure, velocity distribution were simulated and analyzed based on the numerical simulation of the Ployflow software, and the changing rules of material retention time and maximum shear stress were analyzed by tracer particle trajectory tracking method. The results showed that the common screw had low mixing performance of material and high extrusion efficiency. The meshing block had a positive effect on increasing the maximum shear stress, which could enhance the mixing performance, but reduced the self-cleaning ability. The groove structure on the screw could reduce the axial velocity, increase the pressure difference and improve the mixing performance of material, but it reduced the maximum shear stress. In conclusion, the material can be mixed better through the screw structure with groove and meshing block. |
| View full text View/Add Comment Download reader |
| Close |
|
|
|
