Rheologica Acta

, Volume 14, Issue 5, pp 436–446 | Cite as

Experimental investigations into an isothermal spinning threadline: Extensional rheology of a Separan AP 30 solution in glycerol and water

  • C. A. Moore
  • J. R. A. Pearson


Experimental observations on a steady isothermally extending filament of a water/glycerol solution of Separan AP 30 are presented. Photographic records were analysed to give filament diameter (and hence filament speed) as a function of distance below the extrusion die (a glass capillary). Measurements of inline tension were also made. When effects of weight, surface tension and air drag were accounted for, the extensional stress at every point along the filament could be calculated. Results for stress versus extension rate are presented for various flow situations.

Independent rheogoniometric measurements of simple shear viscosity, first and second normal stress differences, and of a crude relaxation time were also made at comparable rates of deformation.

Comparison shows that apparent extensional viscosities are several orders of magnitude larger than corresponding simple shear viscosities. After discussion, no conclusion can be drawn about what constitutive equation is most suitable to describe the results.

An analysis to predict air drag is given.


Surface Tension Normal Stress Constitutive Equation Shear Viscosity Extension Rate 
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  1. Chen, I. J. et al., Trans. Soc. Rheol.16, 473 (1972).Google Scholar
  2. Cogswell, F. N. Plastics & Polymers36, 109 (1968).Google Scholar
  3. Cogswell, F. N. Trans. Soc. Rheol.16, 383 (1972).Google Scholar
  4. Cowsley, C. W. Rep. No. 6, Poly. Proc. Res. Centre, Dept. of Chem. Engng. (University of Cambridge 1970). See also: Bull. Brit. Soc. Rheol.13, 34 (1970).Google Scholar
  5. Hewitt, G. F., P. C. Lovegrove, andB. Nichols, Rep. No. 4478 A.E.R.E. Harwell (1964).Google Scholar
  6. Jackson, R. andA. Kaye Brit. J. Appl. Phys.17, 1355 (1966).Google Scholar
  7. Kanel, F. A., Discussion, Fall meeting of Society of Rheology, Princeton 1970). See also: PhD thesis, University of Delaware, 1972.Google Scholar
  8. Kotaka, T., M. Kurata andM. Tamura J. Appl. Phys.30, 1705 (1959).Google Scholar
  9. Marsh, B. D. andJ. R. A. Pearson, Rheol. Acta7, 326 (1968).Google Scholar
  10. Matovich, M. A., PhD thesis, University of Cambridge, 1968.Google Scholar
  11. Matovich, M. A. andJ. R. A. Pearson Ind. Engng. Chem. Fund.8, 512 (1969).Google Scholar
  12. Meissner, J. Rheol. Acta8, 78 (1969).Google Scholar
  13. Meissner, J. Trans. Soc. Rheol.16, 405 (1972).Google Scholar
  14. Metzner, A. B. andA. P. Metzner Rheol. Acta9, 174 (1970).Google Scholar
  15. Moore, C. A., Melt spinning of viscoelastic liquids. PhD thesis, University of Cambridge, 1971.Google Scholar
  16. Pickup, T. J. F., PhD thesis, University of Cambridge, 1970.Google Scholar
  17. Rotte, J. W., PhD thesis, T. H. Delft, 1969.Google Scholar
  18. Sakiadis, B. C. Amer. Inst. Chem. Eng. J.7, 26, 221, 467 (1961).Google Scholar
  19. Shah, Y. T. andJ. R. A. Pearson Trans. Soc. Rheol.16, 519 (1972).Google Scholar
  20. Spearot, J. A. andA. B. Metzner Trans. Soc. Rheol.16, 495 (1972).Google Scholar
  21. Tanner, R. I. Trans. Soc. Rheol.12, 155 (1968).Google Scholar
  22. Weinberger, C. andJ. Goddard, Paper presented at Fall meeting of Society of Rheology, Princeton 1970. See also:Weinberger, C., PhD thesis, University of Michigan, 1970.Google Scholar
  23. White, J. L., Comments presented at Fall meeting of Society of Rheology, Princeton 1970 (seeWeinberger & Goddard, andKanel, above).Google Scholar
  24. Zidan, M. Rheol. Acta8, 89 (1969).Google Scholar

Copyright information

© Dr. Dietrich Steinkopff Verlag 1975

Authors and Affiliations

  • C. A. Moore
    • 1
  • J. R. A. Pearson
    • 1
  1. 1.Dept. of Chem. Engineering & Chem.Technology Imperial CollegeLondonEngland

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