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随着介入医学的不断发展,医疗领域对医用多腔导管的需求日剧增加,多腔医用导管已经成为微挤出成型技术的研究热点。文章通过数值模拟正交试验设计聚合物多腔导管挤出机头,以挤出速度分布均匀性为目标函数来衡量流道的流动均匀性。利用Polyflow数值模拟,通过正交试验研究了不同流道主要结构参数及制品截面结构尺寸下聚合物熔体的挤出速度分布,根据目标函数确定挤出速度均匀性较好机头结构参数。结果表明:在导管截面面积不变的情况下,口模截面尺寸及流道结构参数是影响挤出机头设计的关键因素。
With the continuous development of interventional medicine, the demand for medical multi-lumen catheters in the medical field has increased. Multi-lumen medical catheters have become the research hotspot of micro-extrusion molding technology. In this paper, the polymer multi-lumen catheter extruder head is designed through numerical simulation orthogonal experiment, and the uniformity of flow velocity distribution is taken as the objective function to measure the flow uniformity of the flow channel. By means of Polyflow numerical simulation, the extrusion speed distributions of polymer melt under different flow paths and the cross-sectional structure dimensions of the products were studied by orthogonal experiments. The uniformity of extrusion head speed was determined according to the objective function. The results show that the cross-sectional area of the die and the structural parameters of the runner are the key factors that influence the design of the extruder.