G - Physics – 05 – B
Patent
G - Physics
05
B
G05B 11/01 (2006.01) D21H 19/36 (2006.01) G01J 3/46 (2006.01) G01N 21/86 (2006.01) G05D 11/13 (2006.01)
Patent
CA 2198543
A method and apparatus for controlling the color of an article such as a paper web includes performing a comparison between target and measured reflectance values in numerous wavelength bands spanning the visible spectrum. The comparison quantifies correspondingly numerous errors that are modified by a non-linear operation, such as squaring, and then added together. The resulting sum is minimized by individually adjusting the application of a number of colorants to the article. The number of wavelength bands is greater than the number of colorants. This avoids metameric effects which are common in conventional systems that rely on three color space coordinates such as Hunter Laboratories L, a, b: C.I.E. L*, a*, b*; chromaticity x, y, z; and tristimulus X, Y, Z. Colorant response simulators enable the effects of changes in application of colorants to be tested while the actual application of colorants to the article is unchanged.
Macrae & Co.
Valmet Automation (canada) Ltd.
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