Measuring and testing – Liquid analysis or analysis of the suspension of solids in a... – Viscosity
Patent
1976-07-08
1977-06-07
Queisser, Richard C.
Measuring and testing
Liquid analysis or analysis of the suspension of solids in a...
Viscosity
73 60, G01N 1104
Patent
active
040275264
ABSTRACT:
The first normal stress function of a viscoelastic material which is a measure of its elasticity and a more sensitive indication of certain other parameters of the material, and process conditions, than the viscosity thereof, is determined from measurements of the thrust in a direction normal to the inner and outer walls of an annular channel in which the viscoelastic fluid material flows under pressure, at high shear rates in an angular direction. These thrust measurements may be made under regulated flow so as to eliminate the need for alignment of the positions at which the thrust measurements are made. The measurement system is closed so that evaporation and degradation of the fluid material as may occur in such systems as are open to the atmosphere are avoided. The first normal stress function may be determined over a broad range of shear rates such as are experienced in polymer processing (e.g., extrusion and injection molding) so as to facilitate continuous or real time process control.
REFERENCES:
patent: 2568793 (1951-09-01), De Beaumont
patent: 3111838 (1963-11-01), Bucalo
patent: 3465575 (1969-09-01), Kepes
Kacher Martin Lu
Queisser Richard C.
Roskos Joseph W.
University of Rochester
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