Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With testing – sampling or analyzing
Patent
1997-08-01
2000-06-13
Chin, Peter
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
With testing, sampling or analyzing
162 60, 162252, 162258, 162263, 162DIG10, D21C 714, D21C 902
Patent
active
060745223
ABSTRACT:
A method for washing pulp in a multistage pulp washing operation involves controlling operating conditions so as to maximize the efficiency of the operation particularly in response to determination of the percent consistency off the discharge side of each drum washer. The major variables that are useful to control are vat dilution flow, drum speed, vat level set point, drainage aids or defoamers, press roll pressures, vacuum break position, and temperature of the last stage showers.
REFERENCES:
patent: 4207141 (1980-06-01), Seymour
patent: 4840704 (1989-06-01), Seymour
patent: 4869784 (1989-09-01), Seymour
Perkins, J.K., Brown Stock Washing Using Rotary Filters, Tappi Press (Undated), pp 1-17, 19-23, 25-31, 33-37, 39-43, 45-51, 53-55.
Crotogino et al, "The priciples of pulp washing", Tappi Journal, Jun. 1987, pp 95-103.
Perkins et al, "Brown Stock Washing Efficiency", Tappi, vol. 37, No. 3, Mar. 1954.
McCollister, "Optimization of Brown Stock Drum Washer Systems", Tappi, vol. 62, No. 12, Dec. 1979.
G.A. Smook, Handbook for Pulp & Paper Technologists, 2nd, (Vancouver, B.C.:Angus Wilde Publications, 1992), 253-255.
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