Paper making and fiber liberation – Processes and products – Non-fiber additive
Patent
1995-01-19
1997-10-21
Czaja, Donald E.
Paper making and fiber liberation
Processes and products
Non-fiber additive
162 9, 162183, 162158, 1621811, D21H 1764
Patent
active
056792204
ABSTRACT:
A method for enhancing the deposition and retention of particulate filler on papermaking fibers. In a first vessel, there is formed a slurry of papermaking fibers and in a second vessel there is formed a slurry of lime or its equivalent. The fiber slurry is at a consistency of not greater than about 5%. These separately formed slurries are thereafter combined with a gaseous precipitant in a flow reactor and under conditions whereby the gaseous precipitant is subjected to rapid shear and calcium carbonate is deposited in situ on the fibers. Unexpectedly, the reaction time for the formation and deposition of the calcium carbonate filler is very rapid. Control over the pH of the reactants in the reactor is achieved through the sequence of introduction of the reactants to the reactor. Also, through selection of the molar ratio of the gaseous precipitant and lime, the morphology of the calcium carbonate crystals may be controlled.
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Amidon Thomas
Hart Paul
Matthew M. C.
Patnaik Sanjay
Czaja Donald E.
Fortuna Jos'e A.
Hodges, P.C. Paul E.
International Paper Company
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