Method in Use to measure the Metallic Appearance

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  • メタリック感の計測方法
  • メタリックカン ノ ケイソク ホウホウ

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Abstract

There is a twinkling paint among paints for coating the outer surface of a private car. This property which makes the paint twinkle is called “metallic appearance”. Since there has been no practical method to measure the strength of the “appearance”, a new method has been developed through a close co-operation of four companies.<BR>Each company has prepared adequate samples and adopted measuring instrument on hand which may give values of good correlation with the strength of the metallic appearance. As a result of the research of these companies, many things have been revealed, in particular, there have been many reports indicating that the Micro Luster-meter is most effective for this type of research.<BR>In settling the experiment in full scale, each company has prepared the unified measuring samples, and obtained values L which are computed by the measured values of forwarded measuring samples whose measuring conditions are regarded as optimum by each company.<BR>Investigations have also been made on observers who made optical observations of the samples and evaluated them, and then a group of observers were regared as a standard. The correlation between observed scores by these observers and values L showing the strength of the metallic appearance shows a correlation of 70% or over.<BR>(1) With respect to the coated surfaces of a strong metallic appearance, the lightness of ground color has been reduced and great quantities of particles have been mixed when particles made by maker A have been used; while particles made by maker B have been used, a small amount of a larger size of powder has been mixed.<BR>(2) The volues L computed by the Micro Luster-meter show that they have the optimum measuring conditions when an angle of illumination is 30° and an angle of receiving light is 15°.<BR>(3) The stronger the metallic appearance, the greater the value L.<BR>(4) Even if the colors of undercoating and painting are white, gray, black, red or green, the good correlation between evaluation values of optical observations and values L has been maintained.

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