Measuring and testing – Specific gravity or density of liquid or solid
Patent
1977-01-25
1978-10-24
Kreitman, Stephen A.
Measuring and testing
Specific gravity or density of liquid or solid
73 376, G01N 926
Patent
active
041214501
ABSTRACT:
The density of an elongate fiber mass, in particular a fiber or filament sliver or roving, or a roll of tobacco, is continuously measured by passing the mass through a channel, supplying a fluid "e.g. air under pressure" to a transverse groove in the channel wall so that the fluid escapes along the channel at a rate dependent on said density, and measuring the pressure of the fluid upstream of the groove. Two further transverse grooves in the channel wall, between the first-mentioned groove and the ends of the channel, serve to extract the fluid, whereby the fluid flow and hence the density measurement are rendered independent of conditions at the channel ends. Preferably, a supplementary collector is provided between at least one end of the channel and the associated further groove, to extract any air that may enter the channel end.
REFERENCES:
patent: 2407100 (1946-09-01), Richardson
patent: 2757675 (1956-08-01), Powell
patent: 3633590 (1972-01-01), Pocock et al.
patent: 3728894 (1973-04-01), Stern
patent: 3885417 (1975-05-01), Stern
patent: 3990292 (1976-11-01), Stern
Kreitman Stephen A.
Ross Karl F.
Zellweger Uster Ltd.
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