Relationship between neck-in phenomena and rheological properties in film casting

Toshihisa Kajiwara, Masato Yamamura, Tomoko Asahina

研究成果: ジャーナルへの寄稿学術誌査読

17 被引用数 (Scopus)

抄録

We numerically demonstrate that the ratio of uniaxial to planar elongational viscosity controls the neck-in phenomena of the casting polymer films, i.e., the decrease in film width value for both viscous and viscoelastic fluids. Quasi-three-dimensional numerical simulations of an isothermal film casting process were performed using a finite element method for two viscoelastic fluids using Larson and PTT models, purely-viscous non-Newtonian fluids using Cross model and Newtonian fluids. The increase in take-up velocity relative to that in extrusion showed particular film deformations of neck-in depending upon the rheological properties in the models. The results indicate that the film width is determined by the ratio of uniaxial to planar elongational viscosity rather than the extension-thickening nature in uniaxial elongation. The computations using different fluid models show that the viscosity ratio is universal for predicting the neck-in value of the stretching polymer films not only in viscoelastic but also in pure viscous fluids.

本文言語英語
ページ(範囲)97-103
ページ数7
ジャーナルNihon Reoroji Gakkaishi
34
2
DOI
出版ステータス出版済み - 7月 10 2006

!!!All Science Journal Classification (ASJC) codes

  • 材料科学(全般)
  • 凝縮系物理学
  • 材料力学
  • 機械工学

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