Apparatus for determining an electrical characteristic of a fibr

Details Apparatus for determining an electrical characteristic of a fibr Apparatus for determining an electrical characteristic of a fibr

1982-11-05

1985-08-13

Tokar, Michael J.

Electricity: measuring and testing

Determining nonelectric properties by measuring electric...

324425, 324450, 162 49, 162263, 204 1T, G01N 2700

Patent

active

045352852

ABSTRACT:
In the formation of a paper web from stock fed to a Foudrinier wire, the Zeta Potential is an important parameter. A measure of Zeta potential is made by measuring the streaming potential developed in a vertically-arranged cell having a horizontal mesh therein on the underside of which a pad of fibres and fines is formed by pumping stock into the lower part of the cell. Electrodes located in the cell above and below the pad are used to obtain a measure of streaming potential at a given pressure differential across the pad. A pressure transducer is mounted in the lower part of the cell. Corrections are made for temperature and conductivity by sensors in the stock feed path to the cell. A microprocessor control and measuring circuit is disclosed which sequences valves for controlling the flow of stock and flushing fluid to the cell and which measures the relevant parameters.

REFERENCES:
patent: Re28940 (1976-08-01), Komline, Sr. et al.
patent: 2252222 (1941-08-01), Van Os
patent: 3461030 (1969-08-01), Keyes
patent: 3723712 (1973-03-01), Komline, Sr. et al.
patent: 3958177 (1976-05-01), Reeves et al.
patent: 4253329 (1981-03-01), Karnis
patent: 4254377 (1981-03-01), Findl et al.
Sack, W., Kontinuierliche Stromungspotentialmessung an einer PM, Das Papier 30, No. IDA, pp. V42-V46, 1976.

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