Measuring and testing – With fluid pressure – Porosity or permeability
Patent
1985-12-11
1987-03-24
Tokar, Michael J.
Measuring and testing
With fluid pressure
Porosity or permeability
G01N 1508
Patent
active
046515577
ABSTRACT:
An apparatus is provided for measuring the flow-pressure characteristics of gas passing through a product sample with two faces, for example for measuring the permeability of a sample of air permeable material such as cigarette paper. A sample holder allows the external face of the paper to be exposed to atmospheric pressure and the internal face to a sub-atmospheric pressure created by a pump, whereas the value of this pressure difference and of the air flow passing through the sample is measured. A control system comprising a continuously controlled control valve and an electronic circuit controlled by a reference signal and a signal representative of the real pressure difference or of the real flow rate allows measurement conditions to be obtained rapidly in conformity with the requirements of certain standards and recommendations.
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Roskos Joseph W.
Societe Nationale d'Exploitation Industrielle des Tabacs et Allu
Tokar Michael J.
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