Measuring and testing – With fluid pressure – Porosity or permeability
Patent
1980-05-29
1981-09-08
Goldberg, Gerald
Measuring and testing
With fluid pressure
Porosity or permeability
73 451, G01N 1508
Patent
active
042877547
ABSTRACT:
The wrappers of filter cigarettes or analogous rod-shaped articles which constitute or form part of smokers' products and wherein portions of the wrappers have perforations are tested while moving sideways in the flutes of an endless conveyor. The testing involves establishing a less pronounced pressure differential between the interior and exterior of unperforated wrapper portions and a more pronounced pressure differential between the interior and exterior of perforated wrapper portions. An electropneumatic transducer generates first signals which denote the rate of fluid flow through the perforated and unperforated wrapper portions. Such signals are compared with first and second reference signals which respectively denote the maximum permissible and minimum acceptable permeability of wrappers, and the articles wherein the permeability of wrappers exceeds the maximum permissible permeability or is less than the minimum acceptable permeability are segregated from other articles.
REFERENCES:
patent: 3690149 (1972-09-01), Pezzi
patent: 3913381 (1975-10-01), Heitmann
Dahlgrun Rolf
Heitmann Uwe
Lorenzen Heinz-Christen
Wahle Gunter
Goldberg Gerald
Hauni-Werke Korber & Co. KG
Kontler Peter K.
Roskos Joseph W.
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