JP2015184147A - Color matching method of bright material containing coating film, and structure member applied with bright material containing coating film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technology which can easily match colors of two parts which are applied with a coating in different atmospheres.SOLUTION: When matching, for example, an L-value (L2) of a resin part to an L-value (L1) of a steel plate part by changing and adjusting colors out of both the two parts of the steel plate part and the resin part which are applied with the same color coating at preset initial coating conditions, a combination and an adjustment amount of a suitable parameter out of coating parameters such as the spray pressure of a spray gun at a coating process of the resin part, a gun distance, a discharge amount, discharge pressure, and a flash time are selected and set, the parts 2 are applied with a coating at a set and color-corrected coating condition, the L-value of the resin part is rotated as L2', and a difference between the L-value of the steel plate part and that of the resin part is constantly adjusted. Furthermore, by increasing and decreasing a pigment or a bright material by a prescribed amount, the L-value of the resin part is adjusted so as to match the L-value of the steel plate part.

Description

  The present invention provides a color matching method for a glitter material-containing coating film and a glitter material-containing coating, which perform color matching of coating films of at least two parts that are coated in different environments with the same color containing the glitter material. It relates to the structural member.

  Metallic paint and pearl paint coating on automobile bodies contain glitter materials such as flaky aluminum pieces and mica pieces, and these glitter materials make the reflective properties of the paint film the size and arrangement of the glitter material pieces. The color of the coating varies depending on the viewing direction of the coating film.

  In particular, in automobiles, a body for one unit is made up of a member with a metallic coating applied to a steel plate and a member with a metallic coating applied to a resin. In this case, the paint used for the steel plate and the resin is used. Because of the difference between the steel plate and the difference between the steel plate and the resin that requires low temperature baking from the viewpoint of preventing thermal deformation during baking, the coating film formed on the steel plate and the coating film formed on the resin have the same color. Even if it coats so that it may become, the color hue by visual observation between the two members arrange | positioned adjacently may differ.

  Therefore, conventionally, brightness, saturation, and hue are measured at three angles of 15 °, 45 °, and 75 ° or 110 ° with respect to incident light at 45 ° with respect to the normal direction of the sample coating film containing the bright pigment. Measure the difference between the directional reflection characteristic value in each direction and the directional reflection characteristic value of the reference color coating film containing the bright pigment as the brightness difference, saturation difference and hue difference, and determine the color tone of the sample coating film. Has been proposed (Patent Document 1).

  In addition, when toning a toned product composed of a plurality of colorants and glitter materials, or a flop sensation modifier, a colorant and glitter material or flop sensation that matches the target color and the target radiance and particle sensation. When calculating the compounding ratio of the adjusting agent, the colorant and the glitter material so that the variable spectral reflectance and color value depending on the glitter obtained by a variable angle spectrophotometer capable of measuring multiple angles match. Or, it is possible to predict and calculate the reproducible spectral reflectance by blending a flop sensation modifier, take an image with an imaging means such as a scanner or CCD camera, and obtain the graininess and radiance peculiar to metallic pearl color by image filtering. It has also been proposed to use the obtained values to calculate the blending ratio of an appropriate colorant and glittering material or flop feeling modifier that reproduces the particle feeling simultaneously with the hue and glittering feeling (Patent Document 2).

Japanese Patent No. 3234753 (see paragraphs 0018-0032) JP 2003-294530 A (refer to paragraph 0012, abstract, etc.)

  However, in the method described in Patent Document 1, the color tone of the sample coating film is determined in order to determine the directional reflection characteristic value of the angle in three directions and each directional reflection of the reference color coating film containing the bright pigment. There is a problem that it takes time and man-hours to obtain a difference in brightness, a saturation difference and a hue difference from the characteristic value. Further, when a difference occurs in the orientation of the flake pieces of the glitter material between the adjacent members as in the case where a body of an automobile is constituted by a plurality of members, for example, the method of Patent Document 1 described above requires time and labor. However, it is not clear about an effective method for accurately eliminating the difference, and the specific means for color matching is unknown.

  Further, in the method of Patent Document 2, in the prediction calculation, as the basic data of the colorant and the glittering material or the flop feeling adjusting agent related to the desired color, an image of a variable angle spectral reflectance, a granular feeling, an image histogram, 2 Since it is necessary to prepare a dimension space filter value and the like, and the method of toning is adopted, the above-described basic data is required for each coating condition even for the same color, which is very complicated.

  An object of the present invention is to provide a technique that enables easy color matching of two parts to be painted under different environments.

  In order to achieve the above-described object, the color matching method of the glittering material-containing coating film according to the present invention is the color of the coating film of at least two parts which are coated in the same environment containing the glittering material in different environments and are arranged adjacent to each other. In the color matching method of the glittering material-containing coating film to be aligned, the first component and the second component are irradiated with light from the light source at a set incident angle, and the specularly reflected light in each of the two components The reflected light at the first angle smaller than a predetermined reference angle and the reflected light at the second angle larger than the reference angle are received by the light receiving means, and both the reflected light from the received reflected light Coating of spray gun spray pressure, gun distance, discharge amount, discharge pressure, flash time, rotation atomizing coating machine rotation speed, etc., so that the difference in L value in the hunter color system of parts is constant After adjusting the parameters, by toning the brightness of the paint is characterized by performing the color matching in the zero difference between the L value becomes constant (claim 1).

  In addition, the structural member to which the glittering material-containing coating of the present invention has been applied is the incident light set in the structural member including at least two components that are painted in the same color and containing the glittering material in different environments. The light from the light source is irradiated to each of the first component and the second component at a corner, and the reflection at a first angle smaller than a predetermined reference angle with respect to the reflection direction of the regular reflection light in each of the two components. Each of the light and the reflected light at the second angle larger than the reference angle is received by the light receiving means, and the difference between the L values in the Hunter color system of the two parts is constant from the received reflected light. By adjusting paint parameters such as spray pressure of spray gun, gun distance, discharge amount, discharge pressure, flash time, rotational speed of rotary atomizing coating machine, and then adjusting the brightness of paint Is characterized by comprising the first component and the second component formed by color matching with the difference between the L value becomes constant to zero (claim 2).

  The L value, a value, and b value of the hunter color system obtained by measuring the reflected light from the object with the gonometric colorimeter, for example, indicate the regular reflection direction of the irradiation light from the light source as shown in FIG. It changes almost linearly in an angle range of approximately 15 ° to 110 ° with respect to the reference, and each value decreases as the angle increases in inverse proportion. Further, as shown in FIG. 5, the L value changes linearly in the range of θ = 25 ° on the highlight side to θ = 75 ° on the shade side.

  By the way, when the two objects A and B on which the glittering material-containing coating film of the same color is formed have L values as shown in FIG. For example, by increasing or decreasing the pigment of a predetermined color for the object A or increasing or decreasing the brightness material, the L value of the object A in FIG. Therefore, the L value of the object B is usually adjusted.

  However, in this method, although the L value matches or substantially matches within a certain angle θ and a predetermined range in the vicinity thereof, there is a difference between the L values of both objects A and B at an angle shifted from the angle θ. There is a subtle difference in the visual color of both objects A and B. Specifically, when an automobile body is constituted by a door made of steel plate and a fender panel made of resin, even if the door and the fender panel are color-matched, the color of both is the same at a certain time. Even if it looks like this, there will be a phenomenon that it looks different because the solar altitude changes at different times.

  That is, the color of the two objects A and B at all angles can be adjusted only by adjusting the color matching of the two objects A and B formed with the same color of the glitter material-containing coating film by increasing or decreasing the pigment or the glitter material. Cannot be combined.

  On the other hand, the inventor of the present application adjusts the coating parameters such as the spray pressure of the spray gun, the gun distance, the discharge amount, the discharge pressure, the flash time, the rotational speed of the rotary atomizing coating machine, and the object shown in FIG. It was experimentally verified that the slope of the L value of A (or object B) can be rotated.

  Therefore, when performing color matching of the two objects A and B on which the same color bright material-containing coating film having the L value shown in FIG. 5 is performed, the spray pressure of the spray gun, the gun distance, the discharge amount, etc. Adjust the coating parameters of the object to make the slope of the L value of the object A (or object B) parallel to the L value of the object B (or object A), and then increase or decrease the pigment etc. By translating the L value of the object A (or the object B) toward the one matching the L value of the object B (or the object A), the L values of both the objects A and B are matched at all angles. It becomes possible to make it.

  At this time, it is preferable to experimentally obtain in advance a combination of parameters and an adjustment amount as to how the coating value such as the spray pressure of the spray gun, the gun distance, and the discharge amount is adjusted and how much the L value rotates. Then, by selecting and setting a combination of coating parameters and an adjustment amount according to a necessary rotation amount, the L value of the object can be rotated by a desired amount. In addition, a quantitative relationship between the increase / decrease amount of the pigment or the like and the parallel movement amount of the L value is determined in advance by how much the pigment etc. can be increased or decreased to translate the L value of the object after rotation. It is desirable to find it experimentally.

  Therefore, as in the invention according to claim 1, the light from the light source is irradiated to each of the first component and the second component at the set incident angle, and the reflection direction of the regular reflection light in each of the two components. On the other hand, the reflected light at the first angle smaller than the predetermined reference angle and the reflected light at the second angle larger than the reference angle are received by the light receiving means, and the hunter color of both parts is received from the received reflected light. After adjusting the paint parameters such as spray gun spray pressure, gun distance, discharge amount, discharge pressure, flash time, rotational atomizer rotation speed, etc. Even when both parts are painted in different environments by adjusting the light and dark to make the difference between the constant L value zero and performing color matching, the first angle to the second angle range It is possible to perform color matching Oite both parts easily.

  Moreover, according to the invention which concerns on Claim 2, it can provide the structural member which adjoins and arrange | positions two components which were painted by different environmental conditions and color-matched in the range of the 1st angle to the 2nd angle. .

It is the schematic of the motor vehicle in one Embodiment of this invention. It is a block diagram of the color matching apparatus in one Embodiment. It is a principle explanatory view of one embodiment. It is a principle explanatory view of one embodiment. It is a principle explanatory view of one embodiment. It is a principle explanatory view of one embodiment.

  An embodiment in which the present invention is applied to color matching of a steel plate and a resin metallic coating constituting an automobile body as a structural member will be described in detail with reference to FIGS. 1 to 6 as appropriate.

  As shown in FIG. 1, for both parts 1 and 2 of a steel plate part 1 such as a metallic painted door constituting a vehicle body and a resin part 2 such as a fender panel F and a quarter panel Q arranged adjacent thereto. In the case where the glittering material-containing coating film is separately formed in different coating lines, the coating is performed while performing color matching of both parts 1 and 2 as follows.

  A coating film 3 is formed by metallic coating on different coating lines for both parts 1 and 2, and the coating 3 formed on each of these parts 1 and 2 is subjected to L in the Hunter color system by the apparatus shown in FIG. Deriving a value. That is, as shown in FIG. 2, light (incident light) is applied to the coating film 3 by a light source at an incident angle of 45 °, and the incident side with reference to the regular reflection direction (reflection angle 45 °) of the irradiated light from the light source 4 Then, the reflected light at least at angles θ = 25 ° (first angle) and θ = 75 ° (second angle) is received by the measuring means 4 comprising a variable angle colorimeter, and derived from the received reflected light. To derive L (lightness index), a (perceived chromaticity), and b (perceived chromaticity) values in the Hunter color system, and θ = 25 ° and θ = of these L, a, and b values. The L value at both angles of 75 ° is plotted to derive the lightness (L value) characteristic of the straight line.

  And the lightness (L value) characteristic as shown to L1, L2 in FIG. 3 was obtained about the steel plate component 1 and the resin component 2 which gave the metallic coating of the same color on the preset initial coating conditions, respectively. Sometimes, for example, when the L value of the part 2 is changed and adjusted to match the L value of the part 1, the spray pressure of the spray gun, gun distance, discharge amount, discharge in the painting process of the part 2 Select and set the optimum parameter combination and adjustment amount from among the coating parameters such as pressure, flash time, rotational speed of rotary atomizer, paint dilution rate, solvent type, etc. Paint part 2 under painting conditions. As a result, the L value of the part 2 after painting rotates as indicated by the broken line L2 ′ in FIG. 3, and as a result, the difference from the L value of the part 1 in FIG. )), The L value of the part 2 becomes parallel to the L value of the part 1.

  Furthermore, in addition to the coating conditions corrected for color matching, when the component 2 is coated with a predetermined amount of pigment or glittering material, the L value of the painted component 2 is translated from the broken line L2 ′ in FIG. It matches the L value (L1) of the part 1 in the figure, and as a result, the difference from the L value of the part 1 in the figure is adjusted to zero at all angles (25 ° to 75 °). The value matches the L value (L1) of part 1.

  In this way, the L value of the part 2 that is metallic-coated under the initial coating conditions is obtained, the painting parameter for rotating the L value of the part 2 is selected to be parallel to the L value of the part 1, and the rotated part 2 Select the amount of increase or decrease in pigment or brightness material to translate the L value of the component to match the L value of the component 1, change and correct the initial coating conditions for the component 2, and then apply under the corrected coating conditions By doing so, it is possible to match the colors of both parts 1 and 2 that have been subjected to metallic coating in different coating lines (under a coating environment).

  Therefore, according to the above-described embodiment, even when both parts 1 and 2 are painted in different environments, the first angle θ = 25 ° to the second angle θ = 75 °. It is possible to easily match the colors of both parts 1 and 2. As a result, steel plate parts 1 such as metallic painted doors that make up one automobile body and resin parts 2 such as fender panel F and quarter panel Q that are arranged adjacent to each other are painted on separate painting lines. Even if the steel plate part 1 and the resin part 2 cannot be painted on the same painting line, the color matching of both parts 1 and 2 can be easily performed. Become.

  The present invention is not limited to the above-described embodiment, and various modifications other than those described above can be made without departing from the spirit of the present invention.

  For example, in the above-described embodiment, as the coating parameter for rotating the L value, the spray pressure of the spray gun, the gun distance, the discharge amount, the discharge pressure, the flash time, the rotational speed of the rotary atomizing coating machine, the dilution rate of the paint, Although the kind of solvent was mentioned, the coating parameter is not limited to these.

  In the above-described embodiment, the predetermined reference angle is described as θ = 45 °. However, this angle varies depending on the basic color of the coating film 3, and θ = 40 ° or θ = 50 in a certain color. Therefore, it is desirable to set the reference angle θ at which the L value does not change according to the basic color of the coating film 3. Furthermore, the first angle and the second angle are not limited to θ = 25 ° and θ = 75 °.

  In the above-described embodiment, the case where the present invention is applied to the color matching of the metallic coating of the steel plate part 1 and the resin part 2 constituting the automobile body has been described. However, the scope of the present invention is such parts 1 and 2. For example, the present invention can also be applied to color matching of two adjacently arranged parts that are structural members other than an automobile body and are coated with a bright material. Needless to say.

1 ... Steel plate part 2 ... Resin part 3 ... Paint film

Claims (2)

In the color matching method of the glittering material-containing coating film, which performs the color matching of the coating film of at least two parts that are coated in different environments with the same color containing the glittering material and are arranged adjacently,
Irradiating the first component and the second component with light from the light source at a set incident angle,
With respect to the reflection direction of the regular reflection light in each of the two parts, the reflected light at the first angle smaller than the predetermined reference angle and the reflected light at the second angle larger than the reference angle are received by the light receiving means,
Spray gun spray pressure, gun distance, discharge amount, discharge pressure, flash time, rotary atomizing coating machine so that the difference in L value in the Hunter color system of both parts is constant from the received reflected light. After adjusting the paint parameters such as rotation speed,
A color matching method for a glittering material-containing coating film, characterized in that color matching is performed by adjusting the lightness and darkness of the paint so that the constant difference in the L value becomes zero. In a structural member comprising at least two parts that are coated in different environments with the same color containing a glittering material and arranged adjacently,
Irradiating the first component and the second component with light from the light source at a set incident angle,
With respect to the reflection direction of the regular reflection light in each of the two parts, the reflected light at the first angle smaller than the predetermined reference angle and the reflected light at the second angle larger than the reference angle are received by the light receiving means,
Spray gun spray pressure, gun distance, discharge amount, discharge pressure, flash time, rotary atomizing coating machine so that the difference in L value in the Hunter color system of both parts is constant from the received reflected light. After adjusting the paint parameters such as rotation speed,
A glittering material-containing coating comprising the first component and the second component that are color-matched by adjusting the brightness of the paint to a constant difference of the L value to zero. The structural member which gave.

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