Method of monitoring and controlling yield stress

Details Method of monitoring and controlling yield stress Method of monitoring and controlling yield stress

G - Physics

01

N

G01N 11/00 (2006.01) G01N 11/08 (2006.01)

Patent

CA 2209104

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 herein and is 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 is used for process monitoring. It is measured from the residual pressureor torque after a controlled strain rheometer reaches zero strain rate.

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