Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With washing
Patent
1994-10-11
1997-02-04
Lamb, Brenda A.
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
With washing
162 4, D21C 902
Patent
active
055994261
ABSTRACT:
A method of washing cellulosic pulp to remove dissolved solids as well as dirt, inorganic fillers and fiber debris from the pulp. A thin mat of cellulosic pulp having a weight of 3 to 100 pounds of dry fiber per 1000 sq. ft. is applied to the upper surface of a porous, endless belt or fabric. The belt containing the pulp mat is moved in a generally horizontal path, and as it is moved in this path wash water is directed against the exposed upper surface of the mat through a series of longitudinally spaced showers to thereby impregnate the mat with wash water. Water removal devices, preferably table rolls, are located beneath the belt and downstream in the direction of travel from each shower to thereby remove the wash water from the mat. After moving through the path of travel, the washed pulp is removed from the belt, and the wash water removed from the mat can be used in other portions of the papermaking process.
REFERENCES:
patent: 2356285 (1944-08-01), Street
patent: 3065789 (1962-11-01), Beachler et al.
patent: 4680088 (1987-07-01), Bastanzuri
patent: 4686005 (1987-08-01), Biondetti et al.
patent: 4722793 (1988-02-01), Seifert et al.
Gilkey et, "A New Device For High Efficiency Washing of Deink Furnishes" 1988 Pulping Conference, New Orleans, LA, Oct. 30-Nov. 2 in TAPPI Proceedings (Atlanta, Ga, TAPPI Press, 1988), Book 3 pp. 649-654.
Hoffman Environmental Systems, Inc.
Lamb Brenda A.
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