Measuring and testing – With fluid pressure – Porosity or permeability
Patent
1990-02-20
1991-02-12
Williams, Hezron E.
Measuring and testing
With fluid pressure
Porosity or permeability
73 377, 15401, 162263, G01N 1508
Patent
active
049914251
ABSTRACT:
An apparatus for measuring air permeability and boundary air flow for a papermaking fabric, such as a dryer felt. The apparatus includes a housing having an open front end bordered by a lower straight edge. An air flow measuring device, such as an anemometer is mounted in the rear surface of the housing a funnel-shaped deflector directs air entering the open front end of the housing to the anemometer. Air flowing through the anemometer generates an electrical signal in proportion to air flow. The electrical signal actuates a visual display mounted on the housing which provides a visual indication of air flow. A thin blade is mounted at the open front edge of the housing and is adapted to ride along the moving fabric when the apparatus is used. A handle is secured to the upper surface of the housing and extends forwardly of the front end and is adapted to be grasped by an operator.
REFERENCES:
patent: 1446854 (1923-02-01), Marshall
patent: 4311037 (1982-01-01), Gotchel et al.
patent: 4401147 (1983-08-01), Beck et al.
patent: 4730481 (1988-03-01), Schlipf
patent: 4756183 (1988-07-01), Rajala et al.
patent: 4905500 (1990-03-01), Mason
Gulya Thomas G.
Schultz Gary V.
Appleton Mills
Roskos Joseph W.
Williams Hezron E.
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