一种关于高分子熔体在挤出机螺杆中流动的模型及流动行为推导

A Novel Model about Transport of Polymer Melts in Screws During Extrusion Molding

高分子熔体在挤出机螺杆中的流动行为对生产有着重要意义。为了克服双平行平板-直线流动模型中存在的缺陷,本文创新建立了双同心圆柱-螺旋流动模型,其中外圆柱保持静止,内圆柱以恒定速率做螺旋流动。本文以此模型推导了熔体在挤出机螺杆内的流动行为,包括熔体速度、压力、流量、剪切速率。在此基础上,本文还讨论了螺杆尺寸及加工条件对熔体流动行为的影响。

The melt flow behavior of polymer melts in screw is very important for extrusion processing. In order to overcome the shortage of two-parallel finite plates model concerning transport of polymer melts in the screw, this study adopted the double-cylinder helical flow model, whose outer cylinder stays still and inner cylinder moves helically at a constant speed. Bases on the double-cylinder helical flow model, this study derived transport behavior of polymer melts including velocity, pressure, flow rate and shear rate. In addition, this study analyzed related factors including screw sizes and processing conditions.