单螺杆挤出机计量段模拟研究  

Simulation of measurement section of single screw extruder for PLA

作　　者：黄志刚[1] 刘凯[1,2] 李梦林[1] 张宏建[1] 

机构地区：[1]北京工商大学材料与机械工程学院,北京100048 [2]北京二七轨道交通装备有限责任公司,北京100072

出　　处：《食品与机械》2016年第1期63-67,共5页Food and Machinery

摘　　要：针对3种不同类型聚乳酸(PLA)专用螺杆的计量段结构,运用Polyflow软件进行三维流场模拟3种不同类型混炼结构,分析聚乳酸挤出过程的三维等温流场。结果表明:在相同的工艺条件下,不同的单螺杆结构,流道内聚乳酸各物理量的值存在较大差异性;普通型单螺杆的熔体的轴向速度和压力较大,利于螺杆挤出过程,但熔体剪切速率小、熔体黏度大,从而导致挤出熔体质量较差;菠萝型单螺杆的熔体的轴向速度和剪切速率较大且黏度值较小,因此具有较好的塑化能力;菠萝型和销钉型单螺杆在流道内会出现环流的情况,不利于熔体输送。For polylactide （PLA） dedicated screw rod of different type of melt conveying paragraph, using Polyflow software for three dimensional flow field simulation three species different type mixed re fining structure, analysis polylactide extrusion process of three dimensional isothermal flow field. Results showed that： in same of process conditions, different of single screw rod structure conditions, the physical properties of flow road within polylactide exists differences; ordinary type single screw rod of melt body of axis to speed and pressure larger, conducive to screw rod extrusion process, but melt body shear rate is smaller, and melt viscosity is bigger, led to extrusion melt body of quality poor; the axial velocity and shear rate of pineapple type single screw melts is larger, but viscosity is smaller, so it has better plasticizing ability; pineapple type single-screw and pin type single-screw in circulation will flow in the case, and is not conducive to melt-conveying.

关 键 词：聚乳酸 单螺杆挤出机 计量段 流场模拟 

分 类 号：TQ320.52[化学工程—合成树脂塑料工业]