JP2005058907A - Production method for coated plate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a production method for a coated plate on which patterns with gradually changeable color tones can be easily formed. <P>SOLUTION: This invention is related to the production method for the coated plate in which finishing coating materials 3 of a plurality of colors are coated by spraying on a surface of a metal substrate 2 coated with a base coating material 1. The finishing coating material 3a with a same color as the base coating material 1 and finishing coating materials 3b and 3c with colors different from the base coating material 1 are coated so as to be partially overlapped. By this way, a part in which the finishing coating material 3a with the same color as the base coating material 1 and the finishing coating materials 3b and 3c with colors different from the base coating material 1 are present in a mixed state can be formed. The part in which the finishing coating materials 3a, 3b and 3c are present in the mixed state makes boundaries of the base coating material 1 and the finishing coating materials 3b and 3c inconspicuous. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a method for producing a painted plate used as a building material such as a roofing material or a wall material, and is particularly used when producing a painted plate having various and high design properties.

  2. Description of the Related Art Conventionally, a multicolored paint film is formed by spray-coating two or more colors of paint on a belt-like object moving at a speed of 10 m / min or more (see, for example, Patent Document 1). . In the coating method described in Patent Document 1, at least two or more paint discharge nozzles are used to discharge at least two different paint colors, so that the paint discharged from each paint discharge nozzle is mixed. A spray pattern is formed.

However, in the above coating method, if the color difference between the color of the surface of the belt-like object and the color of the spray-painted material is relatively large, the boundary between the surface of the belt-like object and the paint that has been spray-painted is noticeable. As a result, it was difficult to paint a pattern that slowly changes its color tone, such as a kiln-modulated Western tile (Moniel tile).
JP 2003-135998 A (Claims etc.)

  The present invention has been made in view of the above points, and an object of the present invention is to provide a method for manufacturing a coated plate that can easily form a pattern whose color tone changes gradually.

  The method for producing a coated plate according to claim 1 of the present invention is the same as the base paint 1 in the method for producing a painted plate in which a plurality of finish paints 3 are applied to the surface of the metal substrate 2 coated with the base paint 1 by spraying. The finish paint 3a and the base paint 1 and the different color finish paints 3b and 3c are applied so as to partially overlap.

  According to the present invention, the finish paint 3a of the same color as the base paint 1 and the base paint 1 and the finish paints 3b and 3c of different colors are applied so as to overlap each other, whereby the finish paint 3a and the base paint 1 of the same color as the base paint 1 are applied. And different colored finish paints 3b, 3c can be formed, and the base paint 1, the different color finish paints 3b, 3c, and the base paint 1 can be formed by mixing the finished paints 3a, 3b, 3c. This makes it possible to easily form a pattern in which the color tone changes gradually.

  In addition to claim 1, the method for producing a coated plate according to claim 2 of the present invention is characterized in that a finish paint 3a having the same color as that of the base paint 1 is prepared by diluting the base paint 1. is there.

  According to the present invention, the base paint 1 can be used to prepare the finish paint 3a of the same color as that, and the labor for preparing the finish paint 3a can be reduced and the colors of the base paint 1 and the finish paint 3a can be reduced. The occurrence of differences can be reduced.

  In addition to claim 1 or 2, the method for producing a coated plate according to claim 3 of the present invention is characterized in that the finish paint 3 of a plurality of colors is applied by switching over time from the spray gun 4. .

  According to this invention, when applying the finishing paint 3 of a plurality of colors, one spray gun 4 can also be used, compared with the case where the spray gun 4 corresponding to each of the finishing paints 3 of a plurality of colors is used. The number of spray guns 4 can be reduced.

  According to a fourth aspect of the present invention, in addition to any one of the first to third aspects, the base plate and the finish paint having the same color as the base paint are light orange, and the base paint and the finish different from the base paint are provided. The paint color is dark orange and beige.

  According to the present invention, it is possible to easily form a hue and a pattern like a kiln-modulated Western-style tile (Moniel tile) by painting.

  In the present invention, the finish paint of the same color as the base paint and the base paint and the finish paint of the different color are applied so as to overlap each other, thereby mixing the finish paint of the same color as the base paint and the base paint and the finish paint of the different color. The part where this finish paint is mixed makes it easy to form a pattern in which the color tone changes slowly because the boundary between the base paint and the different color finish paint and the base paint is not noticeable. Is.

  Hereinafter, the best mode for carrying out the present invention will be described.

  FIG. 1 shows an example of the present invention. In this example, the base paint 1 and the finish paint 3 are applied (painted) while the long metal substrate 2 is being advanced (conveyed) in the length direction.

  The metal substrate 2 is conventionally used for forming a building material, and examples thereof include a stainless steel plate, a galvanized steel plate, and an aluminum-galvanized steel plate (galvalume steel plate), but are not limited thereto. Is not to be done. Note that primer coating (undercoating) can be applied to the surface of the metal substrate 2.

  The base paint 1 has been conventionally used for building materials and the like, and is applied to give the metal substrate 2 performance such as corrosion resistance, weather resistance, and wear resistance. As such a base paint 1, a polyester resin paint, a urethane resin paint, a vinylidene fluoride resin paint, an acrylic resin paint, a polyolefin resin paint or the like can be used alone or in admixture of two or more. In addition, a pigment is blended in the base paint 1, whereby the base paint 1 is colored in a desired color. Examples of the pigment include various color pigments, rust preventive pigments, extender pigments (silica, alumina, calcium carbonate, barium sulfate, kaolin clay, etc.), but are not limited thereto. The pigment can be blended in consideration of colorability, improvement in adhesion to the resin in the paint, concealment of the base, and the like. Furthermore, as the base paint 1, for example, a shrink paint (a paint having a shrinking effect and having a matting effect) as disclosed in JP-A-2002-146280 can be used.

  Further, the base paint 1 can be blended with an aggregate as a matting agent, an anti-scratch agent, or for the purpose of improving adhesion (anchor effect). Examples of the aggregate include glass fibers, glass beads, resin beads, mica, and the like, but are not limited thereto. Furthermore, the base paint 1 contains synthetic fine powder silica, organic bentonite, carboxymethyl cellulose, polyvinyl alcohol and other thickeners, melamine-based, benzoguanamine-based and isocyanate-based crosslinking agents, and polyacrylic acid-based dispersants. Also good. In the present invention, the viscosity of the base paint 1 is, for example, Ford Cup No. Although it is preferable to set it as 30 to 120 second by the measurement by 4 methods, it is not limited to this.

  As the finish paint 3, the same paint as the base paint 1 can be used. That is, as the finish paint 3, in the same manner as described above, various resin paints such as a polyester resin paint can be blended with pigments, aggregates, and other components. Moreover, as the finish paint 3, finish paints 3a, 3b and 3c having different colors are used. Here, a case where three types of finishing paints 3a, 3b, 3c having different colors are used will be described. However, the present invention is not limited to this, and two types of finishing paints 3 having different colors may be used, or four or more types. May be. Of the multi-color finish paints 3a, 3b, and 3c of different colors, one type of finish paint 3a is the same color as the base paint 1, and the other finish paints 3b and 3c are different from the base paint 1. Each is prepared. In this case, the finish paint 3 a having the same color as the base paint 1 is colored using the same pigment as the base paint 1, and the finish paints 3 b and 3 c different in color from the base paint 1 are colored using a pigment different from the base paint 1. be able to. The finish paint 3a having the same color as that of the base paint 1 is preferably prepared by diluting the base paint 1 with an appropriate colorless solvent, whereby the finish paint having the same color as that of the base paint 1 using the base paint 1 is prepared. 3a can be prepared. Compared with the case where the base paint 1 and the finish paint 3a are prepared separately, the labor can be reduced and the color difference between the base paint 1 and the finish paint 3a occurs. It becomes difficult to do. As will be described later, since the base paint 1 is applied by a roll coater and the finish paint 3a is applied by a spray gun, the base paint 1 is diverted as it is to obtain a finish paint 3a, so that the viscosity is reduced. It is preferable to make it. In the present invention, the viscosity of the finish paint 3 is, for example, Ford Cup No. Although it is preferable to set it as 15 to 45 seconds by the measurement by 4 methods (JIS K 5400), it is not limited to this.

  In the coating apparatus used in the present invention shown in FIG. 1, a single spray gun 4 is provided in a coating booth 10. As the spray gun 4, for example, a spray gun that can spray the finish paint 3 using air supplied from the air pump 14 can be used. One end of a plurality (three) of pipes 11a, 11b, and 11c is connected to the spray gun 4, and the other ends of the pipes 11a, 11b, and 11c store finish paints 3a, 3b, and 3c, respectively. Connected to the paint tanks 12a, 12b, 12c. Further, valves 13a, 13b, 13c such as electromagnetic valves are provided in the middle of the pipes 11a, 11b, 11c. These valves 13a, 13b, and 13c are controlled to be opened and closed by a control device 16 constituted by a computer or the like. Pumps 15a, 15b, and 15c are provided in the middle of the pipes 11a, 11b, and 11c on the upstream side (the paint tanks 12a, 12b, and 12c side) of the valves 13a, 13b, and 13c. Further, the coating apparatus is provided with a roll coater 17 and a baking furnace 18.

  In order to continuously coat the long strip-shaped metal substrate 2 using the coating apparatus as described above, the coating is performed as follows. First, the base coating 1 is applied to the surface (one side) of the metal substrate 2 by the roll coater 17 while the metal substrate 2 is conveyed (advanced) vertically upward. Next, the conveyance direction of the metal substrate 2 is changed by the conveyance roll 20 so that the metal substrate 2 is conveyed substantially horizontally with the coating surface of the base paint 1 facing upward. Next, by passing the metal substrate 2 through the coating booth 10 while being transported substantially horizontally, the finish coating 3 is further sprayed from the spray gun 4 onto the painted surface of the base coating 1 of the metal substrate 2 and applied by spraying. The pattern of application by spraying the finishing paint 3 can be circular or elliptical in plan view. Thereafter, the metal substrate 2 is introduced into the baking furnace 18 and the base paint 1 and the finish paint 3 coated on the metal substrate 2 are baked. In this way, the base paint 1 and the finish paint 3 can be applied to the metal substrate 2. In addition, although it is preferable that the coatings of the base coating material 1 and the finishing coating material 3 which are formed on the metal substrate 2 are 10-30 micrometers, it is not limited to this. Moreover, the spray conditions of the finishing paint 3 can be an atomization pressure of 0.1 to 0.3 MPa, a pattern pressure of 0.1 to 0.3 MPa, a discharge amount of 100 to 500 ml / min, but are not limited thereto. Is not to be done. Further, the line speed (conveying speed of the metal substrate 2) can be 30 to 120 m / min, the baking temperature in the baking furnace 18 can be 180 to 250 ° C., the baking time 20 to 100 seconds, but is not limited thereto. It is not something.

  In the present invention, when the finish paint 3 is applied by spraying as described above, according to the time schedule set in the control device 16, the types of the finish paints 3a, 3b, 3c sprayed from the spray gun 4 are sequentially changed over time. Do this while switching. For example, when the finish paint 3a is sprayed from the spray gun 4, the control device 16 controls the valve 13a to open and the other valves 13b and 13c to close, so that the paint tank 12a is operated by the pump 15a. The finishing paint 3a is supplied to the spray gun 4 through the pipe 11a, so that the finishing paint 3a can be sprayed from the spray gun 4 by the action of the air pump 14. Further, when the finish paint 3b is sprayed from the spray gun 4, it can be performed in the same manner as described above. The control device 16 opens the valve 13b, closes the other valves 13a and 13c, and the pump 15b applies the paint. The finish paint 3b is supplied from the tank 12b to the spray gun 4 through the pipe 11b, and the finish paint 3b is sprayed from the spray gun 4 by the air pump 14. Further, the spraying of the finishing paint 3c from the spray gun 4 can be performed in the same manner as described above. The control device 16 opens the valve 13c, closes the other valves 13a and 13b, and the pump 15c paints the paint tank. After the finish paint 3c is supplied from 12c to the spray gun 4 through the pipe 11c, the finish paint 3c is sprayed from the spray gun 4 by the air pump 14.

  In the present invention, when a plurality of finish paints 3a to 3c having different colors are applied as the finish paint 3 by spraying, the finish paint 3a having the same color as the base paint 1 and the different finish paints 3b and 3c adjacent thereto are provided. Is applied so as to partially overlap. Here, the ratio of overlapping the finish paint 3a of the same color as that of the base paint 1 and the finish paints 3b and 3c of different colors can be appropriately set. However, the finish paint 3a of the same color as that of the base paint 1 and the different finish paint adjacent thereto. 3b and 3c are preferably 5 to 50% overlapped in terms of area (the ratio of the areas where the finish paints 3a to 3c overlap each other), and the finish paints 3a to 3c are formed so that such overlapping portions are formed. This adjusts the spray conditions such as the injection amount per one time and the line speed. Then, as shown in FIG. 2, the finish paint 3a having the same color as the base paint 1 and the base paint 1 and the finish paints 3b and 3c having different colors are mixed in the overlapping portions 30 of the finish paints 3a to 3c. In this mixture, the boundary between the base paint 1 and the different color finish paints 3b and 3c becomes inconspicuous, and a pattern in which the color tone gradually changes is easily formed with the finish paints 3a to 3c. It is something that can be done.

  The coated plate manufactured as described above is formed on a building material such as a metal roofing material or a metal wall material by performing a bending process such as roll forming or cutting to a predetermined size. The building material shown in FIG. 3 is a horizontal roofing material 21 formed in a substantially wavy shape, with a fitting convex portion 22 bent at the upper surface at the upper end and a fitting bent at the lower surface at the lower end. Joint recesses 23 are respectively formed. Although the side roofing material 21 is a metal roofing material, it has an appearance like a kiln-modulated Western style tile (Moniel tile).

  In the present invention, the spray gun 4 can use one coating apparatus as described above, but a coating apparatus including two spray guns 4 may be used as shown in FIG. In this case, the number of spray guns 4 may increase and the apparatus may become large compared to a coating apparatus using a single spray gun 4, but it has the advantage of being able to efficiently apply by spraying. It is. In the coating apparatus shown in FIG. 4, two types of finish paints 3a and 3b are used. However, the present invention is not limited to this, and similarly to the above, the finish paints 3 of three or more colors are used. May be used. Moreover, in the coating apparatus of FIG. 4, although the spray gun 4 was arranged in the direction substantially parallel to the conveyance direction of the metal substrate 2, not only this but the spray gun 4 is conveyed in the conveyance direction of the metal substrate 2 as shown in FIG. They may be arranged in a direction substantially orthogonal to (indicated by an arrow).

  Hereinafter, the present invention will be described specifically by way of examples.

  A coated plate was manufactured using the coating apparatus shown in FIG. As the metal substrate 2, a long steel plate having a width of 914 mm and a thickness of 0.35 mm was used.

  As the base paint 1, a polyester resin paint (“S03-G4651” manufactured by NOF BASF Coatings Co., Ltd.) and a pigment colored with a light orange hue was used. The viscosity of the base paint 1 (20 ° C.) Viscosity measurement using 4 was 60 seconds.

  As the finish paint 3a having the same color as the base paint 1, a base paint 1 diluted with a solvent mainly composed of cyclohexanone and solvent naphtha was used. The viscosity of this finish paint 3a (20 ° C.) The viscosity measurement using 4 was 30 seconds.

  As the base paint 1 and the finish paint 3b of a different color, a polyester resin paint similar to the above was mixed with a pigment and colored in a dark orange hue. In addition, by blending the same solvent as described above, the viscosity (20 ° C.) of the finish paint 3b is changed to Ford Cup No. Viscosity measurement using 4 was 30 seconds.

  As the base paint 1 and the finish paint 3c having a different color, a beige hue is prepared by blending a pigment in the same polyester resin paint as described above. Further, by blending the same solvent as described above, the viscosity (20 ° C.) of the finish paint 3c is changed to Ford Cup No. Viscosity measurement using 3 was 30 seconds.

  Then, the base paint 1 and the finish paints 3a to 3c were applied while conveying the metal substrate 2 at a line speed of 65 m / min. Here, the spraying conditions were an atomization pressure of 0.20 MPa, a pattern pressure of 0.17 MPa, and a discharge amount of 290 ml / min (each color). In addition, the spray pattern in spray coating is as follows: the finish paint 3a is sprayed for 0.15 seconds → no spray for 0.10 seconds → the finish paint 3b is sprayed for 0.20 seconds → no spray for 0.10 seconds → the finish paint 3c is 0. . Spraying for 20 seconds-> No spraying for 0.08 seconds-> Finishing paint 3a is sprayed for 0.15 seconds->. FIG. 6 shows a repeating pattern of spraying (ON) and non-spraying (OFF) of each of the finish paints 3a to 3c. In this way, the finish paint 3a having the same color as that of the base paint 1 and the finish paints 3b and 3c having different colors were partially overlapped (20% in terms of area). As a spray gun, a color combination gun “T2925” manufactured by Asahi Sunac was used. Next, the metal substrate 2 after spray coating is introduced into the baking furnace 18 and baked at a temperature of 230 ° C. for 50 seconds, so that the coating thickness of the base coating 1 is 18 μm and the coating thicknesses of the finishing coatings 3a to 3c are A coated plate of 5 to 10 μm was obtained. Thereafter, the coated plate was bent by roll forming or the like and cut to a predetermined length to form a side roofing material 21. The horizontal roofing material 21 had a pattern in which the color tone gradually changed (see FIG. 7).

It is the schematic which shows an example of embodiment of this invention. It is the schematic which shows the coating state same as the above. It is a perspective view which shows an example of a building material same as the above. It is the schematic which shows an example of other embodiment same as the above. It is a schematic diagram of an arrangement of a spray gun, showing an example of another embodiment of the above. It is explanatory drawing which shows an example of the repetition pattern of spray of a spray gun same as the above. It is a photo reproduction showing an example of the building material.

Explanation of symbols

1 Base paint 2 Metal substrate 3 Finish paint 3a Finish paint 3b Finish paint 3c Finish paint 4 Spray gun

Claims (4)

  In the method of manufacturing a coated plate in which multiple colors of finish paint are applied by spraying to the surface of a metal substrate to which the base paint has been applied, the base paint and the finish paint of the same color as the base paint partially overlap A method for producing a coated plate, characterized by being applied to the surface.   The method for producing a coated plate according to claim 1, wherein a finish paint having the same color as the base paint is prepared by diluting the base paint.   The method for producing a coated plate according to claim 1 or 2, wherein a plurality of color finish paints are applied by switching over time from a spray gun.   4. The paint according to claim 1, wherein the base paint and the finish paint of the same color are light orange, and the base paint and the different finish paint are dark orange and beige. A manufacturing method of a board.