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AssigneesMaschinenfabrik Hennecke GmbH, Bayer Aktiengesellschaft
InventorsReiner Raffel, Wilfried Ebeling, Klaus Nadolski, Klaus Schulte
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The instant invention is directed to a method and apparatus for measuring the proportion of undissolved gas in a liquid component for the production of foam materials, particularly, those based on polyurethane. The method is based on the equation of state of ideal gases (Boyle-Mariot Law: P .sup.. V = constant) at constant temperatures. The gas contained in a liquid component charged with gas increases its volume under expansion according to the above equation. The gas expansion causes expansion of the liquid gas mixture. The difference in the volumetric flow rate of the liquid, at two differing pressures, is therefore a measurement of the quantity of gas present in the liquid. The apparatus consists of one volumetric flow rate measurement unit connected upstream of a pressure drop unit, a second volumetric flow rate measurement unit connected downstream of the pressure drop unit and a differential value indicator connected to the first and second volumetric flow rate measurement units.
A method for the production of reaction mixtures from two or more liquid reaction components comprising charging at least one of the reaction components with a gas, measuring the volumetric flowrate of the gas-charged reaction component at a first pressure level, bringing the gas charged reaction component to a second pressure level, measuring the volumetric flowrate at said second pressure level whereby the differential value of the measured volumetric flowrate is a measurement for the gas charge and mixing the gas charged component with the remaining reaction components.
In an improved apparatus for the production of reaction mixtures from liquid reaction components, in which the apparatus has at least two feed streams carrying the separate reaction components to a mixing head and at least one feed stream has a gas inlet, the improvement wherein said apparatus is provided with a gas charge measurement means comprising a first volumetric flowrate measurement unit in each feed stream having a gas inlet, said first volumetric flowrate measurement unit connected downstream of each gas inlet, a pressure drop unit in each feed stream having a gas inlet, said pressure drop unit connected downstream of each first volumetric flow rate measurement unit, a second volumetric flowrate measurement unit in each feed stream having a gas inlet, said second volumetric flowrate measurement unit connected downstream of each pressure drop unit and upstream of the mixing head, and a differential value indicator connected to each of the first and second volumetric flowrate measurement units.
Dependencies are inferred from the claim text.