多腔精密医用导管机头结构及口模设计研究  

The Design of Die for Multi-lumen Precise Medical Catheter

作　　者：朱常委[1] 吴大鸣[1] 

机构地区：[1]北京化工大学机电工程学院,北京100029

出　　处：《塑料》2008年第5期99-102,7,共5页Plastics

基　　金：北京市教育委员会产学研合作项目--<精密医用导管的研发及产业化>(2H100100522)

摘　　要：介绍了较佳的多腔精密医用导管机头结构,并对两类典型多腔精密医用导管的机头定型段流场进行了数值模拟分析,获得了出口截面上的速度分布图。同时研究了截面上沿最大壁厚路径及最小壁厚路径上的速度分布,提出了整个截面速度均匀性的定义。此外,综合实际挤出过程中注气这一特征,给出了修正后的口模截面形状,同时进行了定型段流场的模拟。结果表明:修正后口模截面的速度均匀性和壁厚均匀性都有了很大的提高,这对同类机头的结构设计及口模截面的确定具有较强的参考价值。A preferable die was designed based on the experiments and theory research.By simulating of melts flow in the die for two type of multi-lumen precise medical catheters,distribution of velocity at the exit of die were obtained.Moreover,distribution of velocity along the most and least thickness at the cross section of die exit was studied,and uniformity of velocity was put forward.A modified die was designed based on the balance of local area flux,the uniformity of vecolity and a gas injection during extrusion.The result of simulation showed that the modified die was better.

关 键 词：医用导管 机头设计 数值分析 

分 类 号：TQ320.52[化学工程—合成树脂塑料工业]