Method of measuring drainage rate

Details Method of measuring drainage rate Method of measuring drainage rate

1985-02-08

1986-09-23

Alvo, Steve

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

With testing, sampling or analyzing

73 614, 73 63, 162263, G01N 700, G01N 1100

Patent

active

046134069

ABSTRACT:
The drainage quality of a pulp furnish slurry on a paper machine forming wire is predicted by the drainage tester of this invention by accounting for the effect of drainage through the paper sheet as it forms. The tester can distinguish between fast draining mechanical pulps and slower draining chemical pulps as well as predict the effects various additives will have on drainage. The apparatus includes a screen which separates furnish fibers from the slurry white water in response to a constant volume vacuum pump. Pressure differential as a function of time is recorded producing for any given furnish three distinctive points of inflection on the curve, including a first point of inflection which correlates with the wet line on a paper machine forming wire, second point of inflection which correlates with the dry line on the former and a third point of inflection which correlates with the maximum practicable removal of water from said pad by the typical former vacuum systems.

REFERENCES:
patent: 2602325 (1952-07-01), Campbell et al.
patent: 3368392 (1968-02-01), Miller
patent: 3688563 (1972-09-01), Erarsson et al.
patent: 3838594 (1974-10-01), Kesler
McGill, "Measurement and Control in Paper Making", Adam Hilger Ltd., G.B., 1980, pp. 240-241.
Gess, J. M., "A New Drainage Analysis System", Mar. 1984, Tappi Journal, pp. 70-72.
Clark, James D'A., "Freeness Fallacies and Facts", vol. 53, No. 1, Jan. 1970/Tappi, pp. 108-113.

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