Measuring and testing – With fluid pressure – Porosity or permeability
Patent
1987-04-03
1988-03-15
Levy, Stewart J.
Measuring and testing
With fluid pressure
Porosity or permeability
73 377, G01N 1508
Patent
active
047304812
ABSTRACT:
An improved device for testing the air permeability of an article, particularly felts and screens associated with the manufacture of paper products. The improved device incorporates a measuring channel traversed by air, and inserted into another cylindrical belt channel traversed by air, with both channels attached with their orifices to the test object.
The fan wheel of an anemometer is placed inside the measuring channel to measure the flow rate, the air flow through the measuring channel being non-separating and irrotationally incident on the fan wheel. The measuring channel contains, in addition, sensor devices to determine the static pressure in the channel in order to enable a pressure difference control. The cylindrical belt channel and measuring channel are constructed in such a fashion that the flow rate and flow speed in the belt channel are approximately the same as the flow rate and flow speed in the measuring channel.
REFERENCES:
patent: 3466925 (1969-09-01), Ziegenhagen et al.
patent: 4311037 (1982-01-01), Gotchel et al.
patent: 4471649 (1984-09-01), Cronshaw
patent: 4672841 (1987-06-01), Schuster et al.
patent: 4676091 (1987-06-01), Schuster et al.
Levy Stewart J.
Roskos Joseph W.
Wurttembergische Filtztuchfabrik D. Geschmay GmbH
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