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Introduction |
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OCFM One Component Foam Measurement |
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 Fig. 1: The OCFM* comprises the cylinder holder for aligning the FPM 50 filled with the foam sample under the ultrasonic sensor. The PPA enables defined dosing of OCF into the cardboard cylinder. The meteorological data is recorded by the optional GFTB 200 mounted to the top of the pillar. * patent pending |
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One Component Foam Measurement The One Component Foam Measurement device OCFM is specially designed to measure the rise profile, the rise pressure, and the reaction temperature of One Component Foams (OCF). The OCFM comprises a cylindrical expansion container, filled with the OCF froth, and a special holder for aligning the expansion container under an ultrasonic distance sensor. The test volume of the expansion container is confined by the walls of a narrow cardboard cylinder, the foam pressure measurement device at the bottom and a movable plug on top. During the foam expansion the movable plug is lifted by the foam towards the ultrasonic distance sensor. The reaction temperature of the foam is measured with a thermocouple. The OCFM can be completed with the optional meteorological station GFTB 200, which detects essential ambient parameters like temperature, air pressure, and air humidity. |
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When using the OCFM, the cylinder walls are impregnated with a defined amount of water thus giving reproducible measurements independent of the ambient air humidity. The cardboard cylinder is placed over the Perfect Preparation Aid (PPA) and the movable plug is inserted into the cylinder to a prealigned position. A defined mass of OCF froth is injected into the cylinder the quantity being checked with a balance. The cylinder containing the sample is placed onto the Foam Pressure Measurement device FPM 50. Then the FPM 50 is positioned under the cylinder holder of the OCFM. During the foam rise the thermocouple can be inserted through the cylinder wall into the rising foam. To prevent the thermocouple from being stuck to the sample, it must be removed immediately after the test. The foam sample can easily be lifted from the FPM 50 by just loosening the clamp ring and pulling off the cardboard cylinder containing the foam sample and the plug. The sample is available for further physical investigations. |
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 Fig. 2: Rise height (H), rise pressure (P), and reaction temperature (T) is simultaneously recorded by the software FOAM. The curves show the reaction of a One Component Foam (OCF) measured by FOAMAT with the One Component Foam Measurement device OCFM. The colored areas are master curves.
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