The entry convergent flow pattern was observed with flow visualization technique when the resin melt flowed through a die featuring abrupt contraction in cross-section of channel and axial symmetry.

• 应用毛细管流变仪测量了在接近实际挤出工艺条件下低密度聚乙烯熔体的流变性质;应用流动可视化技术,观测了试样熔体流经突然收缩的轴对称口模时的入口收敛流型。