KR19990060134A - High gloss finish coating technology for metal fittings - Google Patents

Abstract

Provides a high gloss finish coating method for improving the gloss and three-dimensional appearance of metal fittings used in elevators and the like.

The high gloss finish coating method according to the present invention is characterized by coating and drying the UV curable transparent paint on the surface of the metal design finished the design work, such as painting, and additionally coating the isolate layer prior to high gloss transparent paint coating and drying And drying, and polishing to remove foreign matter from the surface.

The surface curvature of the metal fittings obtained by the present invention is significantly reduced compared to the surface curvature according to the prior art, thereby improving gloss, three-dimensional or surface aesthetics, and because the work process is relatively simple, the quality uniformity and productivity are significantly improved. You can.

Description

High gloss finish coating technology for metal fittings

The present invention relates to a high gloss finish coating method of a metallic design, and more particularly, to a high gloss finish coating method of coating and drying a transparent paint on a metal design such as an elevator in order to give a three-dimensional appearance such as painting, silk screen, etc. .

Currently, paint, plating, transfer, printing, etching and material application work are widely used for metal equipment used in elevators, etc. Recently, the demand for special equipment by printing and transferring such as silk screen is increasing. It is a trend.

Finished coating work is performed to protect the fabric state of the fabricated metal, and as such a finish coating method, a solvent dilution spray work method is generally used.

This spraying operation is a situation in which the surface of the equipment, such as a tangerine peel when the paint is sprayed on the surface of the equipment is exposed to the equipment as it does not give a three-dimensional effect and is used only as a protective coating layer.

In addition to the surface protection function, in order to eliminate the surface curvature and give a three-dimensional appearance to the design, as shown in Fig. 3, the conventional method of performing three to four spray-type transparent coating (coating) and coating layer polishing, but such work The work is done manually and depends on the labor of the worker.

Referring to the accompanying drawings, a manufacturing process of a general metal garment according to the prior art is as follows.

As shown in FIG. 1, a general metal coating used in an elevator or the like has a pretreatment step for removing oil components from a surface of a metal coating product which has been processed and assembled, a bottom coating step for protecting materials, and color. It is produced in the order of a top coat (上 塗) coating step for producing a, and a drying step process of drying the paint.

The painting process is performed by mixing thinner with paint at a weight ratio of 15 to 30% to facilitate spraying. Painting is usually carried out at a thickness of 30 to 50 μm. The method is determined.

As shown in Fig. 2, the silk screen work process includes the steps of preparing the coating, washing the coating, drying the cleaning liquid, printing a pattern, drying the printing ink, , The inspection step of inspecting the printing state, the transparent coating operation step of protecting the printed layer, the final step of drying for 20 to 30 minutes at 150 ℃, and the final operation state check and packaging step in the order.

At this time, the number of printing is determined according to the number of colors of the pattern to be printed, the drying step is repeated between the number of times and the number of prints, the drying conditions are dried for 20 to 30 minutes at 80-100 ℃ or natural state Leave to dry for at least 24 hours.

As the material of the transparent coating, an acrylic urethane resin transparent paint or a pure urethane resin transparent paint is used, and when it is installed outside, a fluorine resin-based transparent paint containing a fluorine group is used. do.

In order to have a high-gloss gloss or to have a special three-dimensional appearance of the metal fabricated in this way, the conventional painting surface polishing operation as shown in Figure 3 was performed.

The conventional surface polishing operation according to the prior art is a primary coating for applying an acrylic urethane resin-based transparent coating having excellent polishing property to a product having a general design process (eg, a painted product, a silk screen, etc.) in a thickness of 25 to 35 μm. A step, a 10 minute standing step for spreading the coating film on the surface, a second coating step identical to the first coating condition, a drying step drying for 20 minutes at a temperature of 140 to 150 ° C., bending and teeing of the coating layer, and the like. Polishing process step to remove, the third coating with a paint and thinner 1: 1 mixed to 10 ~ 15㎛ thickness, drying step for 20 minutes at 150 ~ 160 ℃ and surface condition inspection step .

At this time, the polishing is rubbed in a predetermined direction until the bending of the coating layer disappears with sandpaper # 140-600 soaked in water.

In addition, if the coating film is bent after the completion of the tertiary coating, the polishing operation is performed again, and then the coating is performed again under the tertiary coating conditions.

However, as described above, in the metal design manufactured by the prior art, the surface is not beautiful due to the bending of the surface generated in the spray coating process, as shown in FIG.

In order to eliminate such curvature and polish, paint surface polishing as shown in FIG. 3 was performed as described above, but such polishing was performed by hand, and the quality was not very different depending on the skill of the operator, and the work was very difficult, resulting in significantly less productivity. There was this.

It is to provide a high gloss finish coating method of the metal design that solves the disadvantages of the prior art as described above of the present invention.

It is another object of the present invention to provide a high gloss finish coating method that removes surface curvature, thereby making the surface beautiful and improving gloss to impart a three-dimensional effect to the design.

It is still another object of the present invention to provide a method of finishing coating of a simple process for imparting high gloss and three-dimensional appearance to a metallic design.

BRIEF DESCRIPTION OF THE DRAWINGS It is process drawing for demonstrating the manufacturing process of the general metal design article.

Figure 2 is a process chart for explaining a manufacturing process of a typical silk screen design.

Figure 3 is a process chart for explaining a polishing operation process according to the prior art for giving gloss and three-dimensional appearance to the painted surface.

Figure 4a shows a curved state of the surface obtained in the general coating operation, Figure 4b shows the surface state of the coating layer obtained as a result of the painting surface polishing operation according to the prior art, Figure 4c is a coating layer obtained in the design manufactured by the present invention Indicate the surface state.

Figure 5 is a flow chart showing the process of the metal garment high gloss finish coating method according to the present invention.

Figure 6a is a photograph of the flow coating equipment used in the coating work of the present invention, Figure 6b is a photograph of the spray coating equipment used in the coating work of the present invention.

7 is a schematic cross-sectional view of a drying furnace used in the present invention, where (1) a section is an infrared heating section, (2) a section is a short wavelength drying section, and (3) a section is a long wavelength drying It is a section.

FIG. 8 illustrates a drying process of the paint according to the present invention used in design, and illustrates a drying reaction mechanism in an initial drying step, a drying progress step, and a drying completion step in order.

Hereinafter, a high gloss finish coating method for solving the disadvantages of the paint surface polishing operation according to the prior art as described above and improving the gloss and three-dimensional appearance of the metal fittings used in elevators and the like will be described.

The high gloss finish coating method according to the present invention is characterized by coating and drying a transparent paint on the surface of the metal design finished the design work, such as painting, high gloss transparent paint in order to solidify the transparent paint coating and excellent surface condition The method may further include coating and drying the isolate layer prior to coating, and polishing to remove foreign substances from the surface.

High gloss transparent paint coating method according to the present invention, as shown in Figure 5, comprising the step of coating an isolate layer on the finished product, such as painting, such as coating, this isolating coating operation is excellent with the following coating In order to achieve adhesion, an epoxy resin or urethane resin isolate is used as the coating material.

This isolating coating work method is carried out by spray coating in the same manner as the general coating work, the working conditions depend on the type of isolate or the surface treatment of the equipment to be painted. Isolate used in the embodiment of the present invention is a two-component urethane resin-based, spraying is carried out after mixing the main body and the curing agent 1: 1.

The precaution in this process is that the type of isolate and the working conditions are determined by the surface treatment condition of the equipment before the operation. For example, if silk screening has been performed prior to this process, it is necessary to use isolates that do not damage the silk screen printed layer or use weakly soluble isolates.

At this time, the isolate to be used must be selected through an experiment, and in general, a fast drying urethane resin or alcohol solvent type epoxy resin isolate may be used.

The following processes include a drying step of drying at 50 to 60 ° C. for 30 minutes or drying at room temperature for 24 hours, a polishing step of lightly removing foreign substances on the surface with a loofah, etc., and an ultraviolet drying acrylic resin or urethane resin system. Spray or flow coating the transparent paint, and drying to dry with ultraviolet light.

As shown in Figure 6, there are two types of coating work methods according to the present invention. In the case of a flat plate structure, the flow coating method of FIG. 6A is used, and the shape of the product is complicated or three or more coating operations are required. For the structure, the spray coating method of FIG. 6B is used.

The flow coating of FIG. 6A is a coating method in which paint flows through the spout and is coated as the product passes between them.

The coating thickness is preferably 100 to 150 μm, and if there are defects such as tees and bends on the surface of the equipment after the work is completed, lightly polish it with a scrubber and then perform the coating work again.

In the drying process according to the present invention, a drying method using a high-pressure mercury lamp that emits ultraviolet rays is used, and the structure of the drying furnace is manufactured differently according to the type of paint and required quality.

As shown in FIG. 7, the general UV drying furnace is arranged in one line. In the order of the lamps, in the section (1) of FIG. 7, the paint is applied at 40 to 50 ° C. for 2 to 3 minutes by an infrared lamp. Evaporate the thinner component of (2) and dry the inside of the coating by light emission such as low pressure mercury at 60W / cm in section (2), and completely dry the coating layer by high pressure mercury at 80 to 130W / cm in section (3). .

Referring to the drying of the paint used in the present invention in more detail, as shown in FIG. 8, (a) is an initial drying process, in which the reaction initiator component starts to dry when exposed to ultraviolet rays of the paint component. Step (b) is a drying progress step of reacting and drying the surrounding paint, and (c) has a merit of drying in a short time of 15 to 45 seconds as a step of drying is completed.

Metallic coating high gloss finish coating method of the present invention, unlike the conventional methods that depended on the manual work is automated and the work process is relatively simple, it is possible to significantly improve the uniformity and productivity of the quality.

In addition, it can be seen that the surface curvature of the metal equipment obtained by the present invention is significantly less than the surface curvature height of the general coating layer or the surface polishing process performed according to the prior art, thereby reducing the appearance of the surface such as gloss, surface aesthetics, etc. Can be significantly improved.

In addition, the surface curvature of the design is very small, there is little concern about the scratch (scratch), and by making the shape and color of the pattern formed on the material to make a three-dimensional impression, the viewer can feel aesthetics.

Claims (6)

Metallic coating high gloss finish coating method, characterized in that the coating and drying the transparent paint on the surface of the metal design finished the design work such as painting. According to claim 1, Prior to the transparent paint coating process, Coating and drying an isolate layer on the metal design finished work; Metallic article high gloss finish coating method characterized in that it further comprises a polishing step for removing foreign matters on the surface of the isolate layer. The method of claim 2, The isolate layer coating operation is performed by spray coating in the same manner as the general coating operation, As the coating material, one of epoxy resin type isolate and urethane resin type isolate is used depending on the metal type of the equipment. The coated isolate layer is a high-gloss finish coating method of the metallic design, characterized in that dried under one of the conditions of 30 minutes at 50 to 60 ℃ and 24 hours at room temperature. 4. The method of claim 2 or 3, wherein the isolate is a urethane resin-based two-component type, and is coated after mixing a main agent and a curing agent in a 1: 1 ratio. The method of claim 1, wherein the transparent coating operation is one of the ultraviolet-drying acrylic resin-based transparent paint and the urethane resin-based transparent paint coating a thickness of 100 ~ 150㎛ by one method of spray coating and flow coating Is done by Drying of the transparent paint layer is a metallic coating high gloss finish coating method, characterized in that performed by ultraviolet light. The method of claim 1, wherein the transparent coating layer drying process is carried out in an ultraviolet drying furnace consisting of a single line, the ultraviolet drying furnace, A first section for evaporating the thinner component of the paint for 2 to 3 minutes at 40 to 50 ° C. by an infrared lamp, A second section for drying the inside of the transparent coating layer by light emission from a low pressure mercury lamp of 60 W / cm, and A high gloss finish coating method for a metallic design comprising a third section for completely drying the transparent coating layer by a high pressure mercury lamp of 80 to 130 W / cm.