Method of coloring or tinting paper: adding red, yellow and blue dyes in selected proportions to base furnish
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United States of America Patent
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Jul 21, 1992
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N/A
app pub date -
Jun 19, 1991
filing date -
Sep 29, 1989
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Abstract
The coloring or tinting of paper is achieved during the paper making process by adding at least one of only the three primary color dyes to a base furnish. The coloring or tinting provides a tighter control for any shade of white paper while maintaining maximum brightness and opacity. The control is obtained at a reduced cost compared to the use of fillers. The method comprises the steps of selecting a set of optical properties for a required paper representing luminosity value (L), red to green color difference value (a), and yellow to blue color difference value (b), measuring the L, a and b values of a base furnish, determining the deviations between the selected values and the measured values and adding at least one of only the three primary color dyes, yellow, red and blue, to the base furnish to achieve the selected set of optical properties for the required paper.
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