中国塑料 ›› 2024, Vol. 38 ›› Issue (11): 87-92.DOI: 10.19491/j.issn.1001-9278.2024.11.015

• 加工与应用 • 上一篇    下一篇

材料物性参数对双层微管气体辅助共挤出胀大的影响

肖兵1, 刘彪1, 陈天荣1, 纪海波1, 邓小珍1(), 徐芳1, 曾嘉航2   

  1. 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
  • 收稿日期:2024-04-19 出版日期:2024-11-26 发布日期:2024-11-21
  • 通讯作者: 邓小珍(1977—),女,副教授,从事聚合物加工成型新技术、新方法研究,Pearl617@163.com
    E-mail:Pearl617@163.com
  • 基金资助:
    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)

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

XIAO Bing1, LIU Biao1, CHEN Tianrong1, JI Haibo1, DENG Xiaozhen1(), XU Fang1, ZENG Jiahang2   

  1. 1.Jiangxi Provincial Key Laboratory of Precision Drive and Equipment,Nanchang Institute of Technology,Nanchang 330099,China
    2.School of Mechanical Engineering,Nanchang Institute of Technology,Nanchang 330099,China
  • Received:2024-04-19 Online:2024-11-26 Published:2024-11-21
  • Contact: DENG Xiaozhen E-mail:Pearl617@163.com

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(η0)、松弛时间(λ)、材料参数εξ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η0λ的影响较大,随着外层熔体η0增大,由29.15 %增大至43.77 %后趋于稳定;挤出胀大率受εξ的影响较小,随着εξ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η0λεξ变化时,挤出胀大率始终接近零,无明显胀大和变形现象。

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

Abstract:

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 (η0), 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 η0 and λ in 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 η0λε and ξ changed, and there was no obvious swelling or deformation phenomenon.

Key words: material physical parameter, double?layer microtubule coextrusion, gas?assisted technology, die swell

中图分类号: