销钉单螺杆混炼段分布混合性能的数值研究  

Numerical Study on Distributive Mixing Performance of Mixing Section of Pin Single-screw Extruders

作　　者：李晓翠[1] 彭炯[1] 陈晋南[1] 

机构地区：[1]北京理工大学化工与环境学院,北京100081

出　　处：《中国塑料》2010年第2期109-112,共4页China Plastics

摘　　要：用正交设计法设计了9组不同排布的销钉单螺杆。采用混合熵作为评价销钉单螺杆混炼段混合性能的指标,数值模拟了不同销钉结构的单螺杆混炼段内聚丙烯熔体的等温流动过程,考察了一个导程内销钉排数、每排销钉个数和销钉高度对销钉单螺杆混炼段混合性能的影响。结果表明,在所设计的正交试验中,沿螺杆挤出方向各截面的混合熵逐渐增大,出口处该值达到最大;在销钉螺杆混炼段一个导程内安装5排,每排5个高度为12mm的销钉时,其混合性能较优。The mixing efficiency in the pin mixing section of a single-screw extruder was evaluated using the normalized mixing entropy. Nine different arrays of the pin mixing sections were designed with the orthogonal design method. The isothermal flow fields of polypropylene melt in the mixing section were calculated using a finite element method. The effects of the row number in a pitch length, the pin number in each row and the pin height on mixing efficiency were discussed. It was found that the normalized mixing entropy increased along the extrusion direction. The best mixing efficiency was obtained by a configuration with five rows of five 12 mm high pins in a single screw pitch.

关 键 词：销钉螺杆 混合性能 数值模拟 混炼段 

分 类 号：TQ320.66[化学工程—合成树脂塑料工业]