Determination of true flow curves from capillary rheometer data
Article first published online: 9 MAR 2003
Copyright © 1968 John Wiley & Sons, Inc.
Journal of Applied Polymer Science
Volume 12, Issue 1, pages 123–129, January 1968
How to Cite
Negami, S. and Wargin, R. V. (1968), Determination of true flow curves from capillary rheometer data. J. Appl. Polym. Sci., 12: 123–129. doi: 10.1002/app.1968.070120111
- Issue published online: 9 MAR 2003
- Article first published online: 9 MAR 2003
- Manuscript Received: 31 MAR 1967
The evaluation of polymer melt viscosity versus shear rate has been customarily done by a time-consuming graphical method, which corrects for non-Newtonian behavior and pressure losses at flow transitions. It is shown by mathematical analysis that the flow data in terms of applied pressure and apparent shear rate can be treated by a semigraphical method, in which calculation of the true flow curve can be done with a computer. Moreover, it is possible in some cases to program the data treatment entirely for computer calculation. Results obtained by the proposed method are in excellent agreement with those obtained by the older graphical method.