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

• US 4,089,206 A
• Filed: 09/17/1976
• Issued: 05/16/1978
• Est. Priority Date: 09/27/1975
• Status: Expired due to Term

• Current Assignee: Bayer AG, Maschinenfabrik Hennecke GmbH
• Original Assignee: Bayer AG, Maschinenfabrik Hennecke GmbH
• Inventors: Althausen, Ferdinand, Raffel, Reiner, Krippl, Kurt, Knipp, Ulrich, Schwesig, Helmut, Fohr, Wolfgang
• Primary Examiner(s): Gill, James J.
• Application Number:
  US05/724,132
• Time in Patent Office: 606 Days
• Field of Search: 73/19, 425/817 R, 425/140, 264/40.1, 264/40.3, 264/50
• US Class Current: 73/19.1
• CPC Class Codes: B29B 7/7409 with supply of gas
• CPC Class Codes: B29B 7/7621 involving introducing a gas or another component in at least one of the components
• CPC Class Codes: G01N 7/00 Analysing materials by measuring the pressure or volume of a gas or vapour

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·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.

Claims

1. An apparatus for measuring the proportion of undissolved gas in a liquid component for foam materials comprising (1) a storage container for said liquid component, from which an input conduit leads via a dosing pump to a mixing head, (2) a gas inlet conduit connected to said input conduit, and (3) a closeable branch conduit connected at one end to the input conduit between the gas inlet conduit and the mixing head and at the other end to an inlet for a closed graduated measurement vessel, which is connected to a variable gas pressure means capable of producing at least two different defined pressures.

2. An apparatus according to claim 1, wherein the variable gas pressure means comprises a conduit which is connectable to at least two sources of gas at different defined pressure.