JPH07109405B2 - Method of measuring paint clarity - Google Patents

Description

TECHNICAL FIELD The present invention relates to a coating sharpness measuring method for quantitatively evaluating the sharpness of a coating film surface.

(Prior Art) As a conventional coating sharpness measuring method, for example, a waveform representing the properties of the coating film surface is decomposed into frequency components, and each texture (smoothness, dustiness, There is a method of calculating the image clarity as a composite function of them after calculating the energy intensity in the frequency domain for glossiness). An example of the apparatus used in the method is shown in FIG. In FIG. 6, 20 is a surface roughness meter, which is a stylus type, sweeps the coating film surface with a diamond needle at a constant speed, and converts it into a waveform of the time change of the vertical movement voltage of the needle due to the uneven shape of the coating surface. To do. twenty one
Is an anti-vibration table that absorbs the vibration of the measurement system, and a surface roughness meter is installed on this. 22 is the painted plate of the sample to be measured,
Reference numeral 23 is a controller for controlling the surface roughness meter. Reference numeral 24 is a device for separating a time waveform obtained from a measuring unit such as a Fourier transform device into frequency components. 25 is a Fourier transform device
Using a computer that analyzes the data obtained as a result of the Fourier transform (frequency analysis) performed in 24, the roughness of each wavelength component obtained in 24 can be used to determine the texture of three types of coating film, namely smoothness (skin skin) and dustiness. Calculations such as integration or weighted integration are performed within a wavelength range corresponding to (feeling of stickiness) and glossiness (glossiness). Reference numeral 26 is a plotter for writing a picture measured by a surface roughness meter, and 27 is a printer for writing data with the surface roughness meter.

(Problems to be solved by the invention) However, in such a conventional coating sharpness measuring method, since the sharpness is measured only by the coating film surface texture regardless of the coating color, the surface texture is If the colors are almost the same but the colors are different, the sharpness measurement value and the visual evaluation do not correspond to each other. That is, as shown in FIG. 7, there is a problem in that the sharpness value and the visual evaluation may be reversed between good and bad. In FIG. 7, H is the hue (Hue) and V is the lightness (Val).
ue) and C represent chroma (Chroma), respectively.
It is a graph which shows the relationship of the conventional image clarity measurement value and sensory amount with respect to blue whose H / V / C is 4.6PB (blue) /3.1/2.9 and 4.3PB (blue) /4.9/7.8.

(Means for Solving the Problem) The inventors of the present invention focused on such a conventional problem and examined the influence of color on the discrimination of surface texture. As a result, it was determined that the difference in surface texture was high in lightness. It was found that it is difficult and the discrimination is easy when the lightness is low, and based on this result, it was found that the above problems can be solved by correcting the sharpness evaluation value based on the lightness.

The present invention has been achieved based on the above findings, and a coating film is formed by a measuring system including a measuring unit that measures the properties of the coating film surface two-dimensionally and three-dimensionally and a colorimetric unit that measures the color of the coating film. The present invention relates to a coating sharpness measuring method, which comprises measuring the surface texture and weighting the measured surface texture value with a colorimetric value to measure the overall coating texture.

In the measuring method of the present invention, preferably, by a measurement system having a frequency conversion unit for separating the signal from the measuring unit into frequency components and a calculation unit for calculating the frequency components, the frequency characteristics of the coating surface properties Three or more types of textures, preferably smoothness (orange skin), greasy feeling (fleshy feeling), and glossy feeling (glossy feeling), are separated, and weighted calculation is performed for each texture by lightness. Measure the film texture.

When the inventors examined the effect of the above-mentioned color on the discrimination of the surface texture performed in the process of achieving the present invention, the texture was separated into a smooth feeling, a dusty feeling, and a glossy feeling, and H / V / C was 4.3PB
/3.0/2.8, 4.1PB / 4.0 / 3.1, 4.7PB / 5.4 / 3.3 and 4.2PB /
When the relationship between the surface properties and the functional amount was determined for the four types of blue (PB) of 7.2 / 2.9, the results shown in FIG. 3 were obtained. FIG. 4 is a summary of the correspondence between the surface roughness and the functional amount at each lightness in FIG. From FIG. 4, the correction value (weighting coefficient) of the surface roughness due to the lightness can be obtained as the gradient of the straight line. As a result of examining the individual difference in the contribution of the color and the surface roughness to the texture, the smoothness is 0.1 to 0.3. A feeling of dustiness 0.
It was confirmed that the use of 2-0.4 and glossiness of 0.5-0.8 corresponded well with the functional amount.

(Embodiment) Hereinafter, the present invention will be described based on an embodiment with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention.

Explaining the configuration and operation, reference numeral 1 is a contact type or non-contact type three-dimensional surface roughness meter. A controller 2 controls the three-dimensional surface roughness meter 1. Reference numeral 3 is a goniocolorimeter, which measures color by measuring a reflected light spectrum of 400 to 800 nm.

Reference numeral 4 denotes a frequency analyzer which separates the surface texture waveform obtained from the surface roughness meter 1 into frequency components. As a result, the size (power; unit μ
V ² ) is obtained. A computer 5 weights the frequency characteristics of the surface obtained from the frequency analysis device 4 with the colorimetric values obtained by the colorimeter 3. For example, the operations of equations (i) to (iii) are performed for each texture, and (i) to (ii)
The image clarity is measured using the sum P _T (power; unit: μV ² ) of i).

(I) "smooth feeling" _{... P} 1~10 /0.5V;P 1~10 is 1~10mm
Size of waviness (ii) "Dustiness" ... P _{0.2 to 0.8} / V; P _{0.2 to 0.8} is 0.2
~ 0.8mm undulation size (iii) "Glossiness" ... P _<0.2 / 2V; P _<0.2 is undulation size of 0.2mm or less In addition, 6 and 7 are plotters and printers that output measurement results. .

FIG. 2 shows another embodiment.

This embodiment relates to a method for optically (two-dimensionally) measuring a surface texture, where 8 is a first licensor and 9
Is a second licensor, 10 is a binarization circuit, 11 is a counter circuit, 12 is a light receiving position calculation circuit, 13 is a subtraction circuit, 14 is a colorimetric value calculation circuit, and 15 is a calculation unit. Reference numeral 16 denotes a display unit, and 17 denotes a measurement result transmission unit. In this method, the surface texture is optically measured, and at the same time, the spectroscopic measurement is performed. For example, as in JP-A-62-103545 and JP-A-62-233712, a pair of slit light beams are detected by a slit type light receiving section placed on a reflecting surface orthogonal to the incident surface, and one of them is detected. This is a method of obtaining a colorimetric value from the reflected light by a spectral distribution detection element.

The calculation unit and the output unit for obtaining the image clarity measurement value from these surface texture measurement values and colorimetric values are the same as in the first embodiment.

(Effects of the Invention) As described above, according to the present invention, since the sharpness measurement is performed including the difference in the discriminating ability of the surface texture depending on the color, as shown in FIG. With respect to the coating film (1), the measured value of the sharpness that matches the visual evaluation can be obtained.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a layout view of a single-row apparatus used for carrying out the method of the present invention, FIG. 2 is a layout drawing of another example apparatus used for carrying out the method of the present invention, and FIG. FIG. 4 is a graph showing the relationship between the surface texture and the functional amount, FIG. 4 is a graph showing the relationship between the lightness and the functional amount, FIG. 5 is a graph showing the relation between the clarity measurement value and the functional amount, and FIG. FIG. 7 is a layout diagram of an apparatus used in a conventional coating sharpness evaluation method, and FIG. 7 is a graph showing a relationship between a conventional measured value of sharpness and a functional amount. 20 …… Surface roughness meter, 21 …… Vibration isolation table 22 …… Sample, 23 …… Controller 24 …… Fourier transform device, 25 …… Computer 26 …… Plotter, 27 …… Printer

Continuation of the front page (56) Reference JP-A-5-322655 (JP, A) JP-A-59-159031 (JP, A) Actually opened 59-4450 (JP, U) Actually opened 62-92431 (JP , U)

Claims (3)

[Claims] 1. A measured value of a surface property of a coating film measured by a measuring system comprising a measuring unit for measuring the property of the coating film surface two-dimensionally and three-dimensionally and a color measuring unit for measuring the color of the coating film. A coating sharpness measuring method, characterized in that the overall coating film texture is measured by performing a weighting calculation on a colorimetric value. 2. The method for measuring the coating sharpness according to claim 1, wherein a measurement system having a frequency conversion unit for separating the signal from the measurement unit into frequency components and a calculation unit for calculating the frequency components is used for coating. Depending on the frequency characteristics of the film surface properties,
A coating sharpness measuring method, characterized in that three or more kinds of textures are separated, and the texture of the coating film is measured by performing a weighting calculation for each texture. 3. The coating sharpness measuring method according to claim 2, wherein the three or more types of textures are "smoothness (orange skin)", "drip feeling (meaty feeling)", and "glossy feeling". These three textures are separated and measured, and the correction value based on the brightness for the three textures of “smoothness (orange skin)”, “drip feeling (meaty feeling)” and “glossy feeling (luster)” ( A weighting factor) is 0.1 to 0.3 for smoothness, 0.2 to 0.4 for dustiness, and 0.5 to 0.8 for glossiness.