Method and apparatus for measuring and regulating the density of

Details Method and apparatus for measuring and regulating the density of Method and apparatus for measuring and regulating the density of

1975-09-12

1977-05-17

Dixon, Harold A.

Radiant energy

Inspection of solids or liquids by charged particles

Including a radioactive source

250359, G01N 2300

Patent

active

040243940

ABSTRACT:
The density of a rod-like tobacco filler in a cigarette making machine is measured and regulated by placing a source of beta radiation adjacent to one side of the moving filler and a transducer at the other side of the filler opposite the source whereby the transducer furnishes a continuous series of electric signals which indicate the weakening of beta rays during passage through successive minute increments of the filler as a function of density of the corresponding increments as well as fluctuations in the intensity of beta rays due to stochastic disintegration of nuclei in the source. The signals from the transducer are integrated, either for fixed periods of time or for periods which are necessary to produce a signal of given intensity, and the thus obtained signals are used to regulate the density of the filler by controlling one or more trimming devices and/or to segregate cigarettes having fillers of unsatisfactory density. The periods of integration of signals from the transducer are shorter than the length of intervals which are necessary to move past the radiation source a portion of the filler whose length equals that of the filler in a cigarette. This renders it possible to regulate the density of tobacco in selected portions, for example at the ends, of discrete cigarettes.

REFERENCES:
patent: 2832352 (1958-04-01), Powell
patent: 3648035 (1972-03-01), Hart

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