Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With chemical or physical modification of liberated fiber
Reexamination Certificate
2007-09-04
2007-09-04
Chin, Peter (Department: 1731)
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
With chemical or physical modification of liberated fiber
C162S100000, C162S181200, C162S182000
Reexamination Certificate
active
10096137
ABSTRACT:
A method of continuously loading fibers in a fiber suspension with calcium carbonate. The fibers include a fiber wall surrounding a lumen. A reactant solid in the form of calcium oxide and/or calcium hydroxide is mixed into the fiber suspension with a resultant initial process pH of between 11 and 12. The fiber suspension is transported at a consistency of between approximately 15 and 30% into an inner chamber of a closed reactor. A reactant gas is injected into the reactor, whereby the reactor is pressurized to a pressure between 5 and 150 psi. A temperature of the fiber suspension within the reactor is controlled at a range between −10° C. and 80° C. The fibers within the fiber suspension are loaded with calcium carbonate as a result of a chemical reaction between the reactant solid and the reactant gas in the reactor over a predetermined reaction time. A specific type of calcium carbonate crystals are grown on the fiber walls of the fibers, depending upon the initial process pH, temperature, pressure and reaction time.
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Chin Peter
Taylor & Aust P.C.
Voith Sulzer Paper Technology North America Inc.
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