Measuring and testing – With fluid pressure – Porosity or permeability
Patent
1982-03-19
1984-11-06
Goldberg, Gerald
Measuring and testing
With fluid pressure
Porosity or permeability
G01N 1508
Patent
active
044804636
ABSTRACT:
In a process for determining the resistance to draw and the gas permeability of a test piece, for example a cigarette or a cigarette paper, a linearly increasing or decreasing volumetric flow is conveyed through the test piece. The volumetric flow and the pressure drop at the test piece are measured continuously and compared with predetermined reference values. When there is equality between at least one measured value and a reference value, the measured value pair under consideration, volumetric flow/pressure drop, is detected. It is thus possible, on the one hand, to determine the characteristic curve of the test piece, i.e. the change in the pressure drop with the volumetric flow, over a greater range of the volumetric flow, and, on the other hand, to measure pairs of values for accurately defined values of the volumetric flow and/or the pressure drop.
REFERENCES:
patent: 3991605 (1976-11-01), Reuland
patent: 4177670 (1979-12-01), Heitmann et al.
patent: 4191046 (1980-03-01), Baker et al.
patent: 4198853 (1980-04-01), Graham et al.
patent: 4198854 (1980-04-01), Washington et al.
patent: 4223551 (1980-09-01), Greve et al.
patent: 4227397 (1979-03-01), Neri
Masurat Heinz-Werner
Schumacher Gerd
B.A.T. Cigaretten-Fabriken GmbH
Goldberg Gerald
Williams Hezron E.
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