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Method for determining the surface gloss of a colour standard

a technology of surface gloss and colour standard, which is applied in the direction of optical radiation measurement, instruments, spectrometry/spectrophotometry/monochromators, etc., can solve the problems of increasing the cost of determining the gloss of the surface, the difficulty of developing real analytical representations of the textured air/paint interface, and the difficulty of predicting formula quality,

Inactive Publication Date: 2014-11-06
AXALTA COATING SYST IP CO LLC
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a method for measuring the gloss of a color standard using an integrating sphere color measurement instrument and a gloss measurement instrument with three gloss-angle measurement geometries. This method allows for the conversion of reflectance data to gloss information, eliminating the need for a separate gloss measurement instrument. This method also allows for the creation of a continuous gloss scale, reducing the number of necessary instruments and eliminating discontinuities in the gloss scale that could lead to non-unique measurement results. Overall, this method improves the efficiency and accuracy of gloss measurements in distributed systems like refinish paint body shops.

Problems solved by technology

A very special problem in this context is the instrumental characterisation of physical surface texture of coatings giving rise to surface gloss which may assume any value between highly glossy and perfectly matt samples.
Realistic analytical representations of the textured air / paint interface are difficult to develop and so far not applied to studies of textured surface coatings.
Below this limit the quality of predicted formulas deteriorates considerably with decreasing degree of surface gloss.
A further disadvantage is that an additional gloss measurement device is necessary to obtain gloss values.

Method used

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  • Method for determining the surface gloss of a colour standard
  • Method for determining the surface gloss of a colour standard
  • Method for determining the surface gloss of a colour standard

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[0074]Two semi-glossy colour shades from the RAL 840-HR register (RAL 3000, RAL 7005), representing a well-accepted and typical collection of colour standards in industrial applications, have been selected to show the efficiency of the method of the present invention. The reflectance functions of the two selected colour standards have been experimentally determined within the visible spectral range. The commercial measurement instrument used for the colour development was equipped with a d / 8° measurement geometry and could be operated in the specular included (SPIN) and excluded (SPEX) modes. This was the same colour measurement instrument as used to determine the calibration function. The gloss values have been measured at the three recommended angles of 20°, 60°, and 85° using the same commercial gloss-meter that had been used to determine the calibration function. The calibration curve of the pair of instruments used (gloss-meter=micro TRI-gloss instrument of Byk-Gardner; colour ...

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Abstract

The invention relates to a method for determining the gloss of a colour standard comprising the following steps: A) experimentally determining reflection spectra R(exp) of the colour standard, comprising a first reflection spectrum and a second reflection spectrum, with an integrating sphere colour measurement instrument, wherein said first reflection spectrum is obtained at (A1) d / 8-geometry with the specular component included, and said second reflection spectrum is obtained at (A2) d / 8-geometry with the specular component excluded, and B) converting reflection spectra data of the experimentally determined reflection spectra R(exp) of the colour standard to gloss values by: B1) acquiring the difference reflection spectrum ΔR of the experimentally determined reflection spectrum R(exp) with the specular component included (A1) and the reflection spectrum R (exp) with the specular component excluded (A2), and B2) determining the gloss values corresponding to said difference reflection spectrum ΔR with the assistance of previously prepared calibration curves, representing the functional relationship between the difference reflection spectrum ΔR and the gloss values measured at one or more gloss angles.

Description

FIELD OF THE INVENTION[0001]The invention relates to a method for determining the gloss of a colour standard. The method can be used in the paint industry or other paint related fields.DESCRIPTION OF RELATED ART[0002]In industrial colour applications a variety of instruments are utilised for the assessment of colour and gloss of surface coatings and corresponding differences between sample pairs. Wherever technically feasible, visual assessments are replaced by instrumental assessments, which hence have to be reliable on the one hand and in conformity with visual perception on the other. Modern colour management systems have to be capable of dealing with colour information of is different sources and account for specific differences of distributed heterogeneous instrumental families and historical data.[0003]A very special problem in this context is the instrumental characterisation of physical surface texture of coatings giving rise to surface gloss which may assume any value betwe...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G01N21/57
CPCG01N21/57G01J3/0251G01J3/504G01N2201/065
Inventor KETTLER, WILHELMJELEN, PETERKORTEN, OLIVER
Owner AXALTA COATING SYST IP CO LLC
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