Measuring and testing – With fluid pressure – Porosity or permeability
Patent
1981-01-22
1983-09-27
Ciarlante, Anthony V.
Measuring and testing
With fluid pressure
Porosity or permeability
G01N 1508
Patent
active
044061560
ABSTRACT:
For the electropneumatic inspection of the longitudinal and/or transversal permeability of the ventilated cigarettes, each cigarette is subjected in any order of succession to at least three of the four inspections consisting in applying a pneumatic pressure alternatively to each of the two cigarette ends, while keeping the opposite end open and subsequently closed. Each of these inspections determines the pneumatic resistance met at the respective cigarette inlet and the values of these resistances are converted into electric signals and used for determining the longitudinal and/or transversal permeability of the cigarette. For this purpose use is made of four-terminal network theory, by considering that the cigarette pneumatic resistance can be regarded as composed of an equivalent transversal resistance, derived from two equivalent longitudinal resistances in series with each other.
REFERENCES:
patent: 3769832 (1973-11-01), Baier
patent: 4127025 (1978-11-01), Mills et al.
patent: 4154090 (1979-05-01), Heitmann et al.
patent: 4177670 (1979-12-01), Heitmann et al.
Ciarlante Anthony V.
Cir - S.p.A. - Divisione Sasib
Roskos Joseph W.
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