材料物性参数对双层微管气体辅助共挤出胀大的影响  

Effect of material physical parameters on gas-assisted coextrusion swelling for double-layer microtubule

作　　者：肖兵[1] 刘彪 陈天荣 纪海波 邓小珍[1] 徐芳 曾嘉航 XIAO Bing;LIU Biao;CHEN Tianrong;JI Haibo;DENG Xiaozhen;XU Fang;ZENG Jiahang(Jiangxi Provincial Key Laboratory of Precision Drive and Equipment,Nanchang Institute of Technology,Nanchang 330099,China;School of Mechanical Engineering,Nanchang Institute of Technology,Nanchang 330099,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,南昌330099 [2]南昌工程学院机械工程学院,南昌330099

出　　处：《中国塑料》2024年第11期87-92,共6页China Plastics

基　　金：江西省教育厅科学技术研究项目(GJJ190950);江西省2024年大学生创新创业训练计划(省级)(S202411319014);江西省自然科学基金面上项目(20202BABL204025);江西省2023年度研究生创新计划项目(YC2023⁃S999)。

摘　　要：建立了单腔双层微管的传统微共挤和气辅微共挤流动模型,采用数值模拟技术研究了零剪切黏度(η_(0))、松弛时间(λ)、材料参数ε和ξ等对挤出胀大率的影响规律。结果表明,传统微共挤过程中,挤出胀大率受η_(0)和λ的影响较大,随着外层熔体η_(0)增大,由29.15%增大至43.77%后趋于稳定;挤出胀大率受ε和ξ的影响较小,随着ε和ξ的增大略有减小,胀大率在37%~39%区间变化。而气辅共挤过程中,当η_(0)、λ、ε和ξ变化时,挤出胀大率始终接近零,无明显胀大和变形现象。In this study,the traditional micro-coextrusion and gas-assisted micro-coextrusion flow models were established for double-layered microtubules.The effects of zero shear viscosity(η_(0)),relaxation time(λ),and material parameters ε and ξ on the die swell rate were investigated by using a numerical simulation technology.The results indicated that the die swell rate was greatly affected by η_(0) andλin the traditional micro-coextrusion process.With an increase in the outer melt viscosity,the die swell rate increased from 29.15% to 43.77% and then tended to be stable.The die swell rate was less affected by ε and ξ,and it decreased slightly with an increase in ε and ξ.The die swell rate varied between 37% and 39%.However,in the gas assisted co-extrusion process,the die swell rate always approached zero when η_(0),λ,ε and ξ changed,and there was no obvious swelling or deformation phenomenon.

关 键 词：材料物性参数 双层微管共挤 气体辅助技术 挤出胀大 

分 类 号：TQ320.66[化学工程—合成树脂塑料工业]