Korea-Australia Rheology Journal

The Korean Society of Rheology (한국유변학회)
권호 표지

Simulations of fiber spinning and film blowing based on a molecular/continuum model for flow-induced crystallization

  • McHugh, Anthony J. (Department of Chemical Engineering University of Illinois at Urbana-Champaign) ;
  • Doufas, A.K. (The Dow Chemical Company, M. E. Pruitt Research Center)
  • Published : 2001.03.01
Download PDF
⟨ Previous Next ⟩

Abstract

This paper describes the application of our recently developed two-phase model for flow-induced crystallization (FIC) to the simulation of fiber spinning and film blowing. 1-D and 2-D simulations of fiber spinning include the combined effects of (FIC), viscoelasticity, filament cooling, air drag, inertia, surface tension and gravity and the process dynamics are modeled from the spinneret to the take-up roll device (below the freeze point). 1-D model fits and predictions are in very good quantitative agreement with high- and low-speed spinline data for both nylon and PET systems. Necking and the associated extensional softening are also predicted. Consistent with experimental observations, the 2-D model also predicts a skin-core structure at low and intermediate spin speeds, with the stress, chain extension and crystallinity being highest at the surface. Film blowing is simulated using a "quasi-cylindrical" approximation for the momentum equations, and simulations include the combined effects of flow-induced crystallization, viscoelasticity, and bubble cooling. The effects of inflation pressure, melt extrusion temperature and take-up ratio on the bubble shape are predicted to be in agreement with experimental observations, and the location of the frost line is predicted naturally as a consequence of flow-induced crystallization. An important feature of our FIC model is the ability to predict stresses at the freeze point in fiber spinning and the frost line in film blowing, both of which are related to the physical and mechanical properties of the final product.l product.

Keywords

References

  1. J. Rheol. v.43 A continuum model for flow-induced crystallization of polymer melts Doufas, A. K;I.S. Dairanieh;A.J. McHugh
  2. J. Non-Newt. Fluid Mech. v.92 Simulation of melt spinning including flow-induced crystallization. Part Ⅰ. Model development and predictions Doufas, A. K;A.J. McHugh;C. Miller
  3. J. Non-Newt. Fluid Mech. v.92 Simulation of melt spinning including flow-induced crystallization. Part Ⅱ. Quantitative comparisons with industrial spinline data Doufas, A. K;A.J. McHugh;C. Miller;A. Immaneni
  4. J. Rheol. v.45 Simulation of melt spinning including flow-induced crystallization. Part Ⅲ. Quantitative comparisons with PET spinline data Doufas, A.K.;A.J. McHugh
  5. J. Rheol. Two-dimensional simulation of melt spinning with a microstructural model for flow-induced crystallization Doufas, A.K.;A.J. McHugh
  6. J. Rheol. v.45 Simulation of film blowing including flow-induced crystallization. Part Ⅲ. Quantitative comparisons with PET spinline data Doufas, A.K.;A.J. McHugh
  7. Polym. Eng. Sci. v.22 Model of steady-state melt spinning at intermediate take-up speeds George, H.H.
  8. J. Appl. Polym. Sci. v.47 On the neck-like deformation in high-speed spun polyamides Haberkorn, H.;K. Hahn;H. Breuer;H.-D. Dorrer;P. Matthies
  9. J. Appl. Polym. Sci. v.19 Studies on blown film extrusion. Ⅱ. Analysis of the deformation and heat transfer processes Han, C. D.;Park, J. Y.
  10. Thin elastic shells Kraus, H.
  11. Intern. Polym. Proc. v.10 Tubular film blowing. Part 1. On-line experimental studies Liu, C.-C.;D.C. Bogue;J.E. Spruiell
  12. Intern. Polym. Proc. v.10 Tubular film blowing. Part 2. Theoretical modeling Liu, C.-C.;D.C. Bogue;J.E. Spruiell
  13. The Theory of Thin Shells Novozhilov, V.V.
  14. J. Fluid Mech. v.42 The flow of a tubular film. Part 2. Interpretation of the model and discussion of solutions Pearson, J.R.A.;C.J.S. Petrie
  15. High-speed fiber spinning, science and engineering aspects Shimizu, J.;N. Okui;T. Kikutani;A. Ziabicki(ed.);H. Kawai(ed.)
  16. High-speed fiber spinning, science and engineering aspects Vassilatos, G.;B.H. Knox;H.R.E. Frankfort;A. Ziabicki(ed.);H. Kawai(ed.)
  17. Comput. Theor. Polym. Sci. v.8 Dynamic modelling of melt spinning Ziabicki A.;L. Jarecki;A. Wasiak