Measuring and testing – With fluid pressure – Porosity or permeability
Patent
1978-03-06
1979-12-11
Swisher, S. Clement
Measuring and testing
With fluid pressure
Porosity or permeability
G01N 1508
Patent
active
041776704
ABSTRACT:
The permeability of portions of or entire wrappers of successive filter cigarettes is tested with a gaseous fluid independently of the permeability of perforated portions of wrappers around the filter mouthpieces. Signals denoting the permeability of major portions of or entire wrappers are compared with a reference signal denoting the maximum permissible permeability, and the cigarettes having wrappers of excessive permeability are segregated from satisfactory cigarettes. Signals denoting the permeability of perforated wrapper portions are made visible to attendants or cause the generation or audible signals, for example, to facilitate proper adjustment of perforating instrumentalities if the permeability of perforated wrapper portions is too low. Alternatively, signals which denote the permeability of perforated wrapper portions are compared with a reference signal denoting the minimum acceptable or excessive permeability, and the cigarettes wherein the permeability of perforated wrapper portions is too low or excessive are segregated from other cigarettes. The cigarettes are moved sideways in the course of measurement of the permeability of their wrappers, and the permeability of major portions of or entire wrappers can be ascertained simultaneously with, prior or subsequent to measurement of permeability of perforated wrapper portions. The perforations are provided for the purpose of admitting atmospheric air into the column of tobacco smoke.
REFERENCES:
patent: 3395570 (1967-08-01), Kochalski
patent: 3690149 (1972-09-01), Fezzi
patent: 3935728 (1976-02-01), Doerman
patent: 3991605 (1976-11-01), Reuland
patent: 4020675 (1977-05-01), Hirsh
patent: 4047421 (1977-09-01), Spiers et al.
Dahlgrun Rolf
Heitmann Uwe
Lorenzen Heinz-Christen
Wahle Gunter
Hauni-Werke Korber & Co. KG.
Kontler Peter K.
Swisher S. Clement
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