多腔微管气体辅助挤出成型的影响机制  

Influence Mechanism of Gas-Assisted Extrusion Molding for Multi-Lumen Microtube

作　　者：邓小珍[1] 陈天荣 刘彪 肖兵[1] 江诗雨 任重[2] Xiaozhen Deng;Tianrong Chen;Biao Liu;Bing Xiao;Shiyu Jiang;Zhong Ren(Jiangxi Provincial Key Laboratory of Precision Drive and Equipment,School of Mechanical Engineering,Nanchang Institute of Technology,Nanchang 330099,China;Jiangxi Provincial Key Laboratory of Advanced Electronic Materials and Devices,Jiangxi Science and Technology Normal University,Nanchang 330038,China)

机构地区：[1]南昌工程学院精密驱动与装备江西省重点实验室机械工程学院,江西南昌330099 [2]江西科技师范大学先进电子材料与器件江西省重点实验室,江西南昌330038

出　　处：《高分子材料科学与工程》2024年第11期79-86,共8页Polymer Materials Science & Engineering

基　　金：江西省2023年度研究生创新计划项目(YC2023-S999);江西省重点研发计划项目(20243BBI91011);江西省自然科学基金重点项目(20224ACB202004);国家自然科学基金资助项目(62165006);江西省光电子与通信重点实验室开放基金项目(20202OEC001)。

摘　　要：以五腔微管为例,建立了多腔微管三维挤出流动模型,采用有限元方法进行了数值求解。通过分析口模内外熔体流场及应力分布,研究了传统和气辅2种不同条件下多腔微管挤出成型的影响机制。结果表明,传统挤出过程中,五腔微管挤出胀大比、主型腔和次型腔椭圆度均随着熔体入口流率和松驰时间的增大而增大,但微管外轮廓椭圆度随着入口流率和松驰时间的增大而减小;气辅挤出过程中,由于口模内外熔体径向速度、剪切速率和第一法向应力差等分布均匀且趋于零值,有效消除了微管截面与口模截面不一致的胀大变形现象,保证了微管外形轮廓、主型腔和次型腔的圆度,且不受熔体流率和松驰时间的影响,能有效提高多腔微管成型质量,实现多腔微管的精密成型。Taking a five-cavity microtube as example,a 3D extrusion flow model of multilumen catheter was established and numerically solved based on finite element method.By analyzing the melt flow field and stress distribution inside and outside the die,the influence mechanism of multi-lumen microtube extrusion molding was studied under traditional and gas-assisted wall slip conditions.The research results indicate that,in the traditional extrusion process,the die swell ratio of the five-cavity microtubule and the ellipticity of the main and secondary cavities all increase with the increase of melt inlet flow rate and relaxation time,but the ellipticity of the outer contour decreases with the increase of inlet flow rate and relaxation time.In the gas-assisted extrusion process,due to the uniform distribution of radial velocity,shear rate and first normal stress difference of melt inside and outside the die,which tends to zero,the swelling deformation of the inconsistency between the catheter and die crosssection is effectively eliminated.It ensures the roundness of the catheter contour,main and secondary cavities,and it is independent of melt flow rate and relaxation time.It can effectively improve the quality of multilumen microtube extrusion forming and achieve precision molding of multi-lumen microtube.

关 键 词：多腔微管 气辅挤出 挤出胀大 椭圆度 

分 类 号：TQ320.663[化学工程—合成树脂塑料工业]