Measuring and testing – Liquid analysis or analysis of the suspension of solids in a... – Viscosity
Patent
1996-07-05
1997-07-29
Dougherty, Elizabeth L.
Measuring and testing
Liquid analysis or analysis of the suspension of solids in a...
Viscosity
73843, G01N 1114
Patent
active
056523769
ABSTRACT:
The yield stress of rheologically plastic fluids such as coatings, sealants, and personal care lotions, determines their tendency to flow at low gravitational stress. Yield Stress is the apparent threshold stress above which flow is observed on an arbitrary time scale. An on-line technique to monitor yield stress during processing was developed, and can be used in controlling the slump or non-slump behavior of such products. A residual stress, after a flow excursion returns to zero shear rate, is related to yield stress. This residual stress can be used for process monitoring. It is measured from the residual pressure or torque after a controlled strain rheometer reaches zero strain rate.
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Deleeuw David Charles
Langley Neal Roger
DeCesare James L.
Dougherty Elizabeth L.
Dow Corning Corporation
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