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PROCESS AND APPARATUS FOR PRODUCING COLORED CHEMICAL COATINGS

  • US 3,601,589 A
  • Filed: 09/19/1969
  • Issued: 08/24/1971
  • Est. Priority Date: 09/19/1969
  • Status: Expired due to Term
First Claim
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1. A process of selecting pigments from a pigment library having a standard pigment to color match a surface coating, wherein said library pigments are nonflakelike pigments which scatter light diffusely, comprising the steps of:

  • generating signals representative of the reflectance spectrum of the surface coating; and

    controlling an automatic processing system in response to a stored program to perform the steps comprising;

    a. generating signals representative of absorption constants (K) and scattering constants (S) of N library pigments, N>

    1, b. in response to said reflectance spectrum signals and said absorption and scattering constant signals, generating signals representative of N-1 concentration ratios between N-1 nonstandard library pigments and the standard library pigment in accordance with;

    where R'"'"''"'"' the corrected reflectance of the surface coating at a given wavelength, K1,S1 the absorption and scatter constants of the standard library pigment at a given wavelength, Ki,Si the absorption and scatter constants of the ith pigment in the library, at a given wavelength, N the number of pigments to be considered from the library, and Ci/C1 the concentration ratio of the ith pigment to the standard pigment, c. and generating, in response to the N-1 concentration ratio signals, signals representative of library pigments selected for use in matching the color of the surface coating.

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