Paper products and a method for applying a dye to cellulosic fibers
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United States of America Patent
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Jul 23, 2002
Grant Date -
N/A
app pub date -
Apr 30, 1999
filing date -
Dec 24, 1997
priority date (Note) -
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status (Latency Note)
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Abstract
Chemical additives can be adsorbed on cellulosic papermaking fibers at high levels with a minimal amount of unadsorbed chemical additives present in the papermaking process water. A method includes treating a fiber slurry with an excess of the chemical additive, allowing sufficient residence time for adsorption to occur, filtering the slurry to remove unadsorbed chemical additives, and redispersing the filtered pulp with fresh water. Filtrate from the thickening process contains unadsorbed chemical additive and it is not sent forward in the process with the chemically treated fibers. The method can be employed to make improved paper products.
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