Measuring and testing – Liquid analysis or analysis of the suspension of solids in a... – Cleaning or foaming ability
Patent
1989-03-15
1990-03-06
Chapman, John
Measuring and testing
Liquid analysis or analysis of the suspension of solids in a...
Cleaning or foaming ability
G01N 1110
Patent
active
049055046
ABSTRACT:
A foam pulse rheometer measures the total integrated stress response of a foaming polymer to a short duration strain pulse applied to the polymer, from which can be calculated the equilibrium modulus and the zero shear viscosity of the foaming polymer during the foaming reaction. A shear plate mounted to a load cell above a jacket extends downwardly into a foaming polymer within the jacket. Under the application of a vertical square wave strain pulse to the jacket, the load cell senses the shear force exerted upon the shear plate by the foaming polymer. Simultaneously, a video camera and recorder monitors the surface area of the plate acted upon by the jacket. For each pulse, simultaneously occurring discrete sensed force values and discrete monitored surface area values can be used to compute the total integrated stress response, from which can be calculated the equilibrium modulus and the zero shear viscosity. By applying successive strain pulses during the foaming process, until the polymer tears away from the plate, the evolution of the equilibrium modulus can be studied throughout the course of the foaming reaction.
Bank David H.
Carriere Craig J.
Christenson Christopher P.
Burger Thomas J.
Chapman John
Roskos Joseph W.
Stallard David S.
Stevens Timothy S.
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