中国塑料 ›› 2025, Vol. 39 ›› Issue (12): 79-84.DOI: 10.19491/j.issn.1001-9278.2025.12.013

• 加工与应用 • 上一篇    下一篇

异向双螺杆挤出机螺杆开槽仿真分析

孙晨昊1,2, 黄志刚1,2, 吴运涛1,2, 刘子豪1   

  1. 1.北京工商大学计算机与人工智能学院,北京 100048
    2.塑料卫生与安全质量评价技术北京市重点实验室,北京 100048
  • 收稿日期:2024-10-28 出版日期:2025-12-26 发布日期:2025-12-22
  • 通讯作者: 黄志刚(1966—),男,教授,从事食品包装机械与材料改性,huangzg@btbu. edu. cn
  • 基金资助:
    国家自然科学基金面上项目(32172277)

Simulation and analysis of slotted screws with different⁃direction configurations in counter⁃rotating twin⁃screw extruders

SUN Chenhao1,2, HUANG Zhigang1,2, WU Yuntao1,2, LIU Zihao1   

  1. 1.School of Computer and Artificial Intelligence,Beijing Technology and Business University,Beijing 100048,China
    2.Beijing Key Laboratory of Plastics Hygiene and Safety Quality Evaluation Technology,Beijing 100048,China
  • Received:2024-10-28 Online:2025-12-26 Published:2025-12-22
  • Contact: HUANG Zhigang

摘要:

以聚乳酸(PLA)为例,研究螺杆开槽对异向双螺杆流道分布规律的影响。以标准的异向双螺杆挤出机作为对照组,研究异向双螺杆挤出机螺杆开槽数量对于挤出特性的影响。将螺杆和流道的几何模型分网后,使用Polyflow流体仿真软件进行模拟,仿真过程中添加示踪粒子并对其运动状态进行研究。结果表明,在螺杆以60 r/min的条件下,由于物料在开槽处堆积,开槽螺杆的建压能力要优于标准螺杆,随着开槽数目增加,挤出机建压能力减弱,其次螺杆开槽增加了在C型室中物料的不规则流动与停留时间,改善了异向双螺杆挤出机的轴向混合性能和混合均匀性,但是由于结构变得复杂,导致螺杆的自清洁能力下降,综合来看,聚乳酸在开三槽的螺杆中挤出效果最好。

关键词: 异向双螺杆, 螺杆开槽, 数值模拟, 分布均匀性, 混合特性

Abstract:

This study investigates the influence of axial screw slotting on the flow patterns within counter⁃rotating twin⁃screw extruders, using polylactic acid (PLA) as the model material. A standard counter⁃rotating twin⁃screw extruder served as the control. The geometric models of the screw and flow channel were meshed and simulated using the Polyflow fluid dynamics software. Tracer particles were introduced to analyze fluid motion. Results indicated that at a screw speed of 60 rpm, a slotted screw configuration enhanced pressure buildup compared to the standard screw, attributable to material accumulation within the slots. However, this pressure⁃building capability weakened as the number of slots increased. Furthermore, the slots promoted irregular flow and extended the material residence time within the C⁃shaped chambers, thereby improving axial mixing and homogeneity. A drawback was the reduction in the screw's self⁃cleaning performance due to the increased structural complexity. Overall, the three⁃slot screw configuration yielded the optimal extrusion performance for PLA.

Key words: opposite?direction twin screw, screw slotting, numerical simulation, distribution uniformity, mixing characteristics

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