Method for manufacturing painted article

Abstract

To provide a method for manufacturing an environmentally excellent painted article.SOLUTION: This method for manufacturing the painted article comprises: an application step of applying a powder resin to a desired place of a conductive painted article; an air injection step of spraying off the powder resin bonded to a place other than the desired place of the painted article by air injection; and a heating step of generating induction current in the painted article to inductively heat the painted article so as to melt and fix the powder resin applied to the desired place to the painted article.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a method for producing a coated article. [Background technology]

[0002] BACKGROUND ART Many methods have been proposed for applying liquid paint to an object to be coated (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2001-025701 Summary of the Invention [Problem to be solved by the invention]

[0004] Some of these liquid paints contain organic solvents, which are easily released into the atmosphere and have a significant impact on the environment.

[0005] Therefore, an object of the present invention is to provide a method for producing coated articles that is environmentally friendly. [Means for solving the problem]

[0006] The above object can be achieved by a method for manufacturing a coated object, which includes a coating step of coating powder resin at desired locations on a conductive object to be coated, an air injection step of blowing off the powder resin adhering to areas of the object other than the desired locations with an air jet, and a heating step of generating an induced current in the object to be coated and inductively heating the object so that the powder resin applied to the desired locations melts and becomes fixed to the object.

[0007] The object to be coated may be a ferrous metal, a non-ferrous metal, graphite, or an alloy thereof.

[0008] The powder resin may be thermosetting and contain at least one of epoxy-based, epoxy polyester-based, polyester-based, acrylic-based, and fluororesin-based powders.

[0009] The powder resin may be thermoplastic and may contain powder of at least one of vinyl chloride, polyethylene, and nylon.

[0010] The powder resin may be thermoplastic and may include powder of an engineering plastic.

[0011] The engineering plastic may be PPS, PEEK, or PI. [Effects of the Invention]

[0012] According to the present invention, it is possible to provide an environmentally friendly method for producing a coated article. [Brief explanation of the drawings]

[0013] [Figure 1] 1A to 1C are explanatory diagrams of a method for producing a coated article. DETAILED DESCRIPTION OF THE INVENTION

[0014] 1A to 1C are explanatory diagrams of a method for producing a coated article according to this embodiment. In the example of FIG. 1A, the object W to be coated is flat, but the shape of the object W to be coated is not limited to this. The object W to be coated is conductive. As shown in FIG. 1A, powder resin is applied to desired locations on the object W to be coated using an application device 10. For example, the powder resin is applied to the top surface of the object W to be coated. This process is an example of an application process. The powder resin may be applied by spraying with compressed air or by electrostatic application.

[0015] Here, there is a risk that the powder resin may adhere to areas other than the desired areas of the workpiece W. Therefore, as shown in Figure 1B, an air injection device 20 is used to inject air to blow away the powder resin P that has adhered to areas other than the desired areas. For example, in the example of Figure 1B, air is injected toward the back and sides of the workpiece W. This process is an example of an air injection process. The blown-away powder resin is collected and reused.

[0016] Next, a coil 30 is placed around the object W to be coated, and an alternating current is passed through the coil 30. This generates an induced current in the object W to be coated, which is then induction heated. As a result, the object W to be coated reaches a high temperature in a short time, and the powder resin melts. Because the object W to be coated is thus directly induction heated, no heating furnace is required. This process is an example of a heating process.

[0017] Thereafter, when the workpiece W is separated from the coil 30, the temperature of the workpiece W drops and the powder resin on the workpiece W solidifies. In this way, a coated product is produced.

[0018] As described above, this manufacturing method is environmentally friendly because it does not use organic solvents. Furthermore, compared to when organic solvents are used, when powder resins are used, maintenance and management are easier. Therefore, the manufacturing of coated objects using this manufacturing method can be carried out unmanned.

[0019] Furthermore, since the powder resin can be applied only to desired locations on the workpiece W, the quality of the coated product is improved.

[0020] The object to be coated W is, for example, an iron-based metal (Fe, SS, SUS, etc.), a non-ferrous metal (brass, gold, platinum, nickel, lead, copper, aluminum, etc.), graphite (carbon), or an alloy thereof.

[0021] The powder of the powder resin may be thermosetting or thermoplastic. Thermosetting powders include epoxy-based powder resins, polyester-based powder resins, epoxy-polyester-based powder resins, fluororesin-based powder resins, and acrylic-based powder resins. Thermoplastic powders include vinyl chloride, polyethylene, nylon, and the like.

[0022] Although the embodiments of the present invention have been described in detail above, the present invention is not limited to such specific embodiments, and various modifications and variations are possible within the scope of the gist of the present invention as defined in the claims. [Explanation of symbols]

[0023] W Object to be painted 10 Coating equipment 20 Air injection device 30 coils

Claims

1. a coating step of coating a powder resin on a desired location of a conductive object to be coated; an air injection step of blowing off the powder resin adhering to areas other than the desired area of ​​the object to be coated by air injection; and a heating step of inductively heating the object to be coated by generating an induced current in the object to be coated so that the powder resin applied to the desired location melts and is fixed to the object to be coated.

2. The method for producing a coated article according to claim 1, wherein the object to be coated is a ferrous metal, a non-ferrous metal, graphite, or an alloy thereof.

3. 3. The method for producing a coated article according to claim 1, wherein the powder resin is thermosetting and contains at least one powder selected from the group consisting of epoxy-based, epoxy polyester-based, polyester-based, acrylic-based, and fluororesin-based powders.

4. 3. The method for manufacturing a coated article according to claim 1, wherein the powder resin is thermoplastic and contains a powder of at least one of vinyl chloride, polyethylene, and nylon.

5. The method for producing a coated article according to claim 1 or 2, wherein the powder resin is a thermoplastic and includes a powder of an engineering plastic.

6. The method for producing a coated article according to claim 5, wherein the engineering plastic is PPS, PEEK, or PI.

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