Ventilation-characteristic measuring apparatus

Details Ventilation-characteristic measuring apparatus Ventilation-characteristic measuring apparatus

1999-08-20

2000-10-24

Raevis, Robert

Measuring and testing

With fluid pressure

Porosity or permeability

G01N 1508

Patent

active

061349488

ABSTRACT:
A ventilation-characteristic measuring apparatus includes a ventilation vessel include of first, second and third cylindrical containers which are airtightly and detachably fitted to one another, and a hoisting and lowering apparatus for hoisting and lowering the third cylindrical container relative to the first and second cylindrical containers. The first, second and third cylindrical containers cooperate with test-piece holding members of test-piece supporting devices to define three airtight chambers. Ventilation characteristics of a cigarette is measured based on a flow rate of air entering into a filter portion of the cigarette disposed in a second airtight chamber and that of air entering into the shredded tobacco of the cigarette disposed in a third airtight chamber as a first airtight chamber on the filter side is evacuated.

REFERENCES:
patent: 4912964 (1990-04-01), Ohtsuki et al.
patent: 5428987 (1995-07-01), Rousseau

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