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Method and system for determining a plurality of colour quality indicators for a colour control of a paint

A quality index, color technology, applied in color measurement using electrical radiation detectors, color measuring devices, color matching, etc., to solve problems such as the impossibility of immediately obtaining paint properties

Pending Publication Date: 2020-07-17
BASF COATINGS GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, based on the above characteristic Q, it is not possible to immediately derive the properties of the paint when it is applied on different surfaces

Method used

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  • Method and system for determining a plurality of colour quality indicators for a colour control of a paint
  • Method and system for determining a plurality of colour quality indicators for a colour control of a paint
  • Method and system for determining a plurality of colour quality indicators for a colour control of a paint

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Embodiment Construction

[0128] figure 1 A schematic diagram showing a flowchart of an embodiment of the method according to the invention. In this case, in step 1 , the respective reflectance values ​​of a plurality of surface elements coated with paint or of reference surface elements are firstly determined with a spectrophotometer for a plurality of measurement geometries and a plurality of light sources. In addition, reflectance values ​​for color references are determined for multiple measurement geometries and multiple light sources. In step 1, various reflectance values ​​were measured and recorded by means of:

[0129] For color references: R(Ref) Ф ->(L*,a*,b*) Ф,l,reference ,

[0130] For corresponding surface elements that are coated with paint, e.g. by automobile manufacturers and / or vehicle suppliers, e.g. during vehicle production ("line"):

[0131] R(line) Ф,i,j ->(L*,a*,b*) Ф,l,i,j,OEM,ASP ,

[0132] Corresponding control surface elements for bodywork or bodywor...

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Abstract

The invention relates to a method for determining a plurality of colour quality indicators for a colour control of a paint, in which colorimetric coordinates of a colour reference and colorimetric coordinates of the paint are determined for a plurality of surface elements painted with the paint, each with a spectrophotometer for a number of measurement geometries and a number of light sources, wherein, for every measurement geometry of the number of measurement geometries and every light source of the number of light sources, respective colour differences are calculated from the colorimetic coordinates of the colour reference and the respective colorimetric coordinates of the paint for the plurality of surface elements painted with the paint, wherein the respective colorimetric coordinatesare scaled with a respective weighting factor, wherein each of the plurality of colour quality indicators is determined at a scale value of a predefined scale by means of a mapping of functional values defined by a mapping rule, said functional values each being determined for the number of measurement geometries and the number of light sources by means of a mathematical correlation - specific tothe respective colour quality indicator - between colour differences of at least one of the surface elements. The invention also relates to a corresponding device.

Description

technical field [0001] The present invention relates to a method and system for determining a plurality of color quality indicators for the color of paint batches based on serial paint comparisons, in particular the color of vehicle bodies and body accessories. Background technique [0002] During hue adjustment, various color-imparting ingredients are added to the paint, and the paint is then compared to a color reference (hue template). For this purpose, the mixed paint is conventionally measured spectrophotometrically, and the measured values ​​determined thereby (ie, for example, the chromaticity coordinates) are compared with the corresponding measured values ​​of the color reference. Especially in the case of effect paints comprising a plurality of effect pigments, a meaningful comparison is only possible between the corresponding effect paint and the corresponding color reference using the measured values ​​determined under the various measuring geometries. This mean...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J3/50G01J3/10G01J3/46
CPCG01J3/504G01J3/10G01J3/463G01J2003/102
Inventor C·维葛诺罗F·斯特夫梅尔
Owner BASF COATINGS GMBH
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