Simulation effects of different contact states of isotropic twin⁃screw extruder on polylactic acid melt flow under non⁃isothermal conditions

doi:10.19491/j.issn.1001-9278.2025.06.011

Abstract

Abstract:

This article reported an investigation on the impact of various contact conditions on the changes in channel characteristics during the extrusion of polylactic acid （PLA） using an opposite⁃direction twin⁃screw extruder in non⁃isothermal issues. Three screw models， including complete meshing， partial meshing， and no meshing were constructed by a Solidworks^® software， and corresponding numerical simulations were carried out by a Polyflow^® analysis software. A comparative study was conducted on the pressure field， shear rate field， and viscosity field of the PLA fluid under different contact states of the three screw models. In the non⁃isothermal case， the complete meshing state exhibited high shear rates and moderate viscosity， which was consistent with the efficient extrusion of PLA. In conclusion， the extrusion effect of PLA in the complete meshing state was superior to the other two screw contact states under non⁃isothermal conditions.

Key words: twin?screw extruder, counter?rotation, non?isothermal, various contact states

CLC Number:

TQ320.66⁺3

CHENG Yuanyuan, HUANG Zhigang, XU Zhen, SUN Chenhao, WU Yuntao. Simulation effects of different contact states of isotropic twin⁃screw extruder on polylactic acid melt flow under non⁃isothermal conditions[J]. China Plastics, 2025, 39(6): 54-58.

Figures/Tables 11

螺杆接触类型	完全啮合	部分啮合	无啮合
中心距/mm	21	23	25

Tab.1. Modeling parameters of threaded components

Fig.1. Linear diagram of the end face of the screw element

Fig.2. 3D model of screw element

Fig.3. Radial temperature cloud chart

Fig.4. Axial temperature cloud chart

Fig.5. Cloud map of PLA shear rate under non⁃isothermal conditions

Fig.6. PLlactic acid shear rate cloud map under isothermal conditions

Fig.7. Poly shear rate line diagram

Fig.8. Poly viscosity cloud map under non⁃isothermal conditions

Fig.9. Poly viscosity cloud map under isothermal conditions

Fig.10. Poly viscosity cloud line diagram

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