Method of coloring or tinting paper: adding red, yellow and blue

Details Method of coloring or tinting paper: adding red, yellow and blue Method of coloring or tinting paper: adding red, yellow and blue

1991-06-19

1992-07-21

Clingman, A. Lionel

Bleaching and dyeing; fluid treatment and chemical modification

Measuring, testing, or inspecting dye process

8919, D06P 500, D21H 2128, D21H 2308

Patent

active

051319101

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.

REFERENCES:
Paper Technol. Ind. 27 No. 5 Aug./Sep. 1986 pp. 208-209, 211, B. E. Evans et al: "Closed-loop color control and papermaking dyes."
Database WPIL, No. 90-050579 Derwent Publications Ltd. London, SU-A-1477803 (Cell Paper Ind Prod).
Tappi Journal, vol. 55, No. 1, Jan. 1972, Atlanta US pages 140-144; J. A. Van Den Akker: "Spectral reflectance, transmitance, . . . ".

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