Method and apparatus for measuring the proportion of undissolved gas in a liquid component for the production of foam materials

US4089206A · kind A · utility

Assignees

• Maschinenfabrik Hennecke GmbH · DE
• BAYER HEALTHCARE LLC · DE

Inventors

• Reiner Raffel · Siegburg, DE
• Ferdinand Althausen · Neunkirchen, DE
• Ulrich Knipp · Bensberg, DE
• Kurt Krippl · Monheim, DE
• Wolfgang Fohr
• Helmut Schwesig

Key dates

• Filing date: Sep 17, 1976
• Grant date: May 16, 1978
• Expiry date: Sep 17, 1996

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B29B7/7621
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

The instant invention relates 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 polyurethanes. The method is based on the equation of state of ideal gases (Boyle-Mariot Law: p.multidot.v = constant) at constant temperatures. The gaseous portion of a liquid component charged with gas increases its volume under expansion according to the above equation. The gas expansion also increases the liquid volume. The differences in the volumes, of the liquid at two differing pressures is therefore a measurement of the quantity of gas present in the liquid. The apparatus consists of a closed graduated measurement vessel being connected to a variable pressure means capable of producing at least two different defined pressures.