利用可视化单螺杆挤出机 ,对螺杆冷却情况下的单螺杆挤出熔融机理进行了研究。实验表明 ,冷却螺杆时固体床始终保持连续而不破碎 ,有利于稳定的挤出过程。在熔融过程中 ,螺槽底部的表面靠近固体床的地方有一层半透明的物质 ,这种物质的产生与聚合物的亚稳态相转变行为有关 The single-screw extrusion melting mechanism under the condition of screw cooling was studied by using the visualized single-screw extruder. Experiments show that the solid bed cooling screw is always continuous without breaking, is conducive to a stable extrusion process. In the melting process, the surface of the bottom of the trough near the solid bed has a layer of translucent material, this material is generated with the polymer metastable phase transition behavior