Measuring and testing – With fluid pressure – Porosity or permeability
Patent
1985-05-09
1987-05-05
Levy, Stewart J.
Measuring and testing
With fluid pressure
Porosity or permeability
73 41, G01N 1508
Patent
active
046622144
ABSTRACT:
The wrappers of filter cigarettes are tested during transport in the peripheral flutes of a drum-shaped conveyor through a testing station where at least one end of the wrapper receives air at a previously stabilized pressure. The stabilized pressure is monitored by an electropneumatic transducer which further monitors the pressure differential between the interior and the exterior of the wrapper at the testing station and transmits appropriate signals to a computer which generates test signals by forming a quotient from the signals denoting the pressure differential and the signals denoting the stabilized pressure. The computer can further process and evaluate signals denoting a selected reference pressure as well as the pressure of air which is used to reduce the likelihood of leakage of air from the interior of the wrapper at the testing station.
REFERENCES:
patent: 3948084 (1976-04-01), Heitmann et al.
patent: 4120194 (1978-10-01), Reuland
patent: 4154090 (1979-05-01), Heitmann et al.
patent: 4287754 (1981-09-01), Heitmann et al.
Brand Peter
Heitmann Uwe
Lorenzen Heinz-Christen
Hauni-Werke Korber & Co. KG
Kontler Peter K.
Levy Stewart J.
Roskos Joseph W.
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