Measuring and testing – With fluid pressure – Porosity or permeability
Patent
1986-07-03
1987-06-16
Levy, Stewart J.
Measuring and testing
With fluid pressure
Porosity or permeability
73 377, 226 97, G01N 1508
Patent
active
046728414
ABSTRACT:
The invention relates to a measuring head for measuring the porosity of a moving strip of porous material. The measuring chamber of the measuring head is covered by a measuring plate in which measuring openings are provided. For porosity measurement, air is sucked in through the porous strip and the measuring openings into the measuring chamber. The amount of air flowing into the measuring chamber is measured by a measuring arrangement connected to the measuring air connector and serves as a measure of the porosity of the strip. The measuring plate is surrounded by a guide plate which partially overlaps a blowing ring. The guide plate and blowing ring together form a blowing slot surrounding the measuring plate, the blow-out opening of which is directed outwardly and tangentially to the lower surface of the moving strip. The necessary blowing air is introduced via a connector into an annular channel, which is formed from a semi-circular groove in the blowing ring and merges into the blowing slot. The blowing air flowing horizontally from the blow-out opening produces a reduced pressure between the lower surface of the moving strip and the curved upper surface of the blowing ring. As a result of this reduced pressure, the strip is pressed onto the edge of the guide plate so that the measuring chamber is laterally sealed and air can flow in only through the measuring openings. A filter can be provided between the measuring openings in the meauring plate and the measuring air connector. An additional suction connector enables cleaning of the filter and of the measuring chamber by means of cleaning air introduced through the measuring air connector.
REFERENCES:
patent: 3268222 (1966-08-01), Off
patent: 3371518 (1968-03-01), Keyes
patent: 3466925 (1969-09-01), Ziegenhagen et al.
patent: 4311037 (1982-01-01), Gotchel et al.
patent: 4471649 (1984-09-01), Cronshaw
patent: 4505412 (1985-03-01), Reba
Gockel Bernhard
Heins Jens-Peter
Schmidt Holger
Schuster Hans K.
Gessner & Co. GmbH
Greenfield George
Levy Stewart J.
Orenbuch Louis
Roskos Joseph W.
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