JPS6283073A - Preparation of decorative board - Google Patents

Abstract

PURPOSE:To enhance the decorative effect and rust inhibiting effect of the end surface of a perforated part, by such a simple method that a hole is preliminarily bored in a steel plate at the predetermined position thereof and rust inhibiting color painting is applied up to the perforated part before applying a picture pattern using a transfer method. CONSTITUTION:In preparing the decorative steel plate used as the outside cover of household electric machinery such as an air conditioner or a television, a hole (a) is bored in the necessary part of a steel plate base material 6. Next, primer paint 7 and color paint 8 is applied to the hole part (a) by a method capable of coating the end surface of the hole part (a) and baked. Subsequently, by utilizing a transfer method as a picture pattern applying method, a transfer paper material 11 to which gravure printing was applied is closely adhered to a perforated painted steel plate and printing ink 9 is transferred to the color paint 8 by heating and pressing said transfer paper material 11 by a transfer roll 12. Then, the transfer paper material 11 is released and, if a clear paint is applied according to necessity, a product having a picture pattern provided up to the end of the perforated part thereof and having high decorative effect and rust-proofness is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a decorative steel plate having holes formed at predetermined positions. In particular, it is used as an outer cover for home appliances, etc. Due to the structure of the device itself, it requires ventilation, exhaust, air intake, etc., and it also requires air ventilation for the purpose of cooling the heat generated inside the device body. Wind machines, coolers, air conditioners,
Used in humidifiers, televisions, videos, copy machines, etc. It is also used in furniture such as lockers, desks, and kitchen cabinets, as well as interior doors, vehicles, and ship interior materials.

[Prior Art] When a hole is provided in a decorative steel plate, a hole is drilled at a predetermined position in the decorative steel plate where no hole is provided. That is, holes are punched at predetermined positions after a pattern is provided by painting and printing a pattern on a steel plate without opening the holes, or by laminating a printed plastic film onto the steel plate. In either method, the end face of the steel plate is peeled between the holes in the steel plate, and a steel plate or a plastic molded product is inserted into the hole.

To explain the conventional technology in more detail, 70% of colored paint is applied to a steel plate.
- Decorative steel plate coated with a clear coating that is painted using a method such as a coater method and then printed using a method such as gravure offset printing (
Decorative steel sheets (referred to as lamination method) are known, such as a colored plastic film printed using a gravure method or the like and laminated onto a steel plate. When these decorative steel sheets are used in products that require perforation, the holes are usually punched using a method such as a mold press after the decorative steel sheet is manufactured. These steel sheets are often made of galvanized steel sheets or other steel sheets that do not have a rust-preventing effect on the cross section, but drilling holes exposes the cross section of the steel sheet at the end of the section, resulting in an unsightly appearance. It is not good and has no rust prevention effect. Figure 3 is a plan view of a decorative board according to the prior art;
The A-A' cross-sectional explanatory diagram of the figure is shown in Fig. 4. In Figs. 3 and 4, 1 is the steel plate, 2 is the brimer paint, 3 is the four-color paint, 4 is the printing ink, and 5 is the clear paint. In the paint, a stands for the hole. This is the case with the above-mentioned painting method. In the laminating method, 2 is an adhesive, 3 is a colored plastic film, and 5 is a clear plastic film or clear paint.

[Objectives and Problems of the Invention] The present invention solves the drawbacks of the above-mentioned conventional methods for producing decorative steel sheets, and the hole drilling operation is performed before painting.

[Means for solving the problem] After drilling a hole in a predetermined position of a steel plate in advance and coating the end surface of the hole with anti-rust paint or colored paint,
Transfer paper with a printed pattern is placed in close contact with a steel plate, the pattern is transferred to the steel plate by heating and pressure, and then the transfer paper is peeled off.
The gist is to apply a clear paint over the transfer, if necessary.

In other words, in order to solve the problems of cosmetic effect and rust prevention effect on the end surface of the part, drilling holes is a method in which the required part is drilled in advance with a mold press on the galvanized steel plate, and then the end surface of the part can be painted. For example, a primer paint and a colored paint are applied using a spray coating method and then baked.

Next, the design is printed on the perforated and painted steel plate.There are several methods for direct printing such as gravure offset printing, offset printing, flexo printing, and silk screen printing, but gravure offset printing, Both offset printing and flexographic printing are extremely difficult to print because wet ink stains the rollers and other parts where the holes are made. Furthermore, silk screen printing does not produce a beautiful printing effect with gradation. For this reason, we used a transfer method to attach the pattern, and the gravure-printed transfer paper was brought into close contact with the perforated and painted steel plate, and only the printing ink was transferred by applying heat and pressure. Because the ink remains, the receiver does not stain the rollers, etc., and the hole in the steel plate has a pattern all the way to the edge, and the decorative plate has a beautiful appearance and rust prevention effect on the hole area. became.

[Function] In the present invention, holes are formed in a steel plate in advance at required locations, and the end surface of the steel plate is coated with antirust or colored paint, and a pattern is applied onto the steel plate by a transfer method, or a pattern is applied onto the transferred pattern. Since a clear φ material is applied to the hole, the printing ink will remain on the transfer paper only on the part of the hole, which will not stain the rollers, etc., and the hole on the steel plate will have the pattern all the way to the edge of the part, and the hole will be on the cross section of the part. A decorative board with good cosmetic properties and anti-corrosion effect can be obtained.

[Example] Next, the dimensions of examples of the present invention are shown.

Example 1 Circular and square holes were made at predetermined positions using a mold press in a 0.6# thick hot-dip galvanized steel plate (Ginc grained stand GOg/i on top and bottom surfaces, special chromic acid treatment). After degreasing the upper surface of the steel plate where the hole was drilled, the end surface of the hole was spray painted with green colored polyester paint containing a rust preventive agent for approximately 30 minutes.
After coating at 0 g/m, baking was performed for 3 minutes in a baking oven at 230°C.

Separately, a transfer paper was prepared by gravure printing a lattice pattern in two colors on a 25 μm thick surface-untreated transparent polyester film using vinyl chloride ink.

Next, the above-mentioned steel plate with green coloring was preheated, and the coated surface was brought into close contact with the ink surface of the transfer paper (while maintaining the plate temperature at 80℃), and the transfer roll was heated for 5 minutes while keeping the surface humidity at 150℃.
After transferring the checkered pattern In4 to the green painted surface by pressing at a pressure of K9/ctA at a speed of 10 m/min, the transfer paper was peeled off. Next, a polyester-based clear paint was applied to the steel plate with the lattice pattern transferred to it by spray painting at 7g/TIt.
It was painted and baked for 2 minutes in a baking oven at 220°C to produce a decorative steel plate (A) with lattice disease. Separately, the same steel plate as above was not made with holes in advance, but after the same green coloring as above, the transfer of the lattice disease, and the clear coating, holes were punched using a press to produce a decorative board (B) with a G'l lattice pattern.

Comparing (B) with (A), the decorative effect of the hole-drilled part other than the part is the same, but the decorative effect of the hole-drilled part is inferior because the end face of the steel plate is exposed. In order to compare the rust prevention effect of the end faces of (A) and <8), a salt spray test (JIS l 2371) was conducted.
), no abnormality was observed on the end surface of the hole (A) after 240 hours test, whereas rust was observed on the end surface of hole (B) after 40 hours test. .

Example 2 Electrogalvanized steel sheet with a thickness of 0.5 mm (zinc coating on top and bottom surfaces 1
i1209/lri, chromic acid treatment) was provided with an oblong hole using a mold press. Next, after degreasing the surface of this steel plate, the end surface of the hole was spray-painted with approximately 59/nL of rust preventive epoxy-based ply 7-paint, and then heated to 90% at 220°C.
I did a second bake. Next, apply brown acrylic paint at approximately 159/TIL using the same spray painting method and heat at 220°C.
It was baked for 3 minutes. Separately, transfer paper was prepared by gravure printing on a 25μ thick surface-untreated polyester film using acrylic release varnish, woodgrain pattern printing ink, and heat sealant in a total of 7 colors. Next, the coated surface and the heat sealing agent surface of the transfer paper were brought into close contact with the brown-painted steel plate, and a transfer roll was used to maintain the surface temperature at 210°C, at a rate of 5 kg/aA.
After transferring the wood grain pattern ink to the brown painted surface, the transfer paper was peeled off and the decorative steel plate with the pattern was applied to the wood grain board and the oval hole. Created.

Example 3 0.5m thick hot-dip galvanizing (upper and lower surfaces zinc weight i60
! J/foot, special chromic acid treatment), use a mold press to make a circular hole in the specified position. After degreasing the upper surface, about 30 g/g of white polyester powder paint was applied by powder electrodeposition to coat the end faces of the holes, and baked at 250° C. for 3 minutes. Separately, 3 geometric patterns were created using PVC ink on a 50 μ thick stretched polypropylene film with an untreated surface.
Transfer paper was produced by color gravure printing. Next, the above-mentioned steel plate coated with white coloring was preheated to a plate temperature of 80°C, and the painted surface and the ink side of the transfer paper were brought into close contact, and the surface temperature was raised to 80°C.
After transferring the geometric pattern ink onto the white colored painted surface by pressing with a transfer roll maintained at 5 kg/ci at a pressure of 5 kg/ci and a speed of 10 m/min, the transfer paper was peeled off. Next, apply acrylic clear paint to the steel plate onto which the pattern has been transferred, using a spray method for approximately 70 minutes.
g/ci and baked at 220° C. for 2 minutes to produce a decorative steel plate with a geometric pattern up to the circular hole portion.

FIG. 1 is an explanatory diagram of the new surface of the decorative steel sheet according to the present invention.
is a steel plate base material, such as a galvanized steel plate, which does not have a self-rust prevention effect on the cross section, and uses steel plates that have been given a rust prevention effect by chemical conversion treatments such as galvanization, chromic acid treatment, and phosphate treatment on the top and bottom surfaces. Holes are made in the necessary locations for the final product using methods such as mold pressing or chemical etching. Since oil and fat and steel plate pieces adhere to the steel plate that has been opened, degreasing is absolutely necessary. For this purpose, the usual method of washing with trichlene or alkaline chemicals is used. Reference numeral 7 is an ordinary brimer paint that serves to strengthen the adhesion between the steel plate 6 and the colored paint 8, and is also coated with a paint that has a rust-preventing effect. The paint used is a resin-based paint such as lboxy-based or vinyl chloride-based paint mixed with powders such as aluminum, iron oxide, zinc, etc.

The coating method requires coating the end surface of the steel plate, and methods such as spraying, electrostatic coating, dipping, and electrodeposition coating can be used. 8 is a colored paint, which is a paint made by mixing colored pigments with resin such as polyester, acrylic, or vinyl chloride. Painting methods include spraying, electrostatic painting, and
Coating is done by methods such as dipping method, M coating method, powder electrostatic coating method, etc.

In some cases, a layer of paint having the effects of both the brimer 7 and the colored ffF18 may be applied. 9 is a printing ink layer for attaching a pattern, and the pattern was attached by a transfer method. FIG. 2 is an explanatory diagram showing the state of transfer according to the present invention, in which a transfer paper on which a pattern is printed using printing ink 9 on a transfer paper material 11 using a gravure printing method is brought into close contact with a colored paint 8, and a transfer roll 12 is applied to the transfer paper material 11. By applying heat and pressure, the printing ink 9 is transferred to the colored paint 8, and the transfer paper material 11 is peeled off.

The transfer paper material 11 is made of polyester film, polypropylene film, etc. - Use a smooth plastic film alone or one with high-quality paper pasted on the back for reasons such as heat shrinkage stability. The printing ink 9 needs to be selected from vinyl, urethane, acrylic, butyral, etc., and has good releasability from the transfer paper material 11. Further, a three-layer transfer paper in which a release resin is applied between the transfer paper material 11 and the printing ink 9, and a four-layer transfer paper in which a heat-adhesive resin is applied after the printing ink 9 can also be used.

By the above manufacturing method, a decorative steel plate can be obtained in which the perforations of the steel plate have a pattern all the way to the edges of the parts, and the perforations have a decorative effect and a rust-preventing effect on the perforated parts. In some cases, clear paint 10 may be applied to improve the surface properties such as solvent resistance and abrasion resistance, or to give a desired surface gloss.The paint may be polyester-based, acrylic-based, vinyl chloride-based, fluororesin-based, etc. paints can be used. In addition to the method of the above-mentioned brimer paint 6, the coating method may be a roll coater coating method, a curtain flow coater coating method, or other coating method that does not necessarily cover the holes or edges of the steel plate.

[Effects] Since the present invention has the above-mentioned configuration, it is particularly characterized by the use of transfer paper, and since there is no object to be transferred in the perforated portion, that portion is not transferred and transferred. Since the ink remains on the paper material 11, the receiver does not stain the rollers, etc.

Because the steel plate is thin, the rubber hardness is soft, or the hole area is large, the printing ink of the transfer paper may come into close contact with the roller at the hole, but the roller will not be baked with silicone. It has the advantage that it can be easily dealt with by applying a peeling treatment such as, etc., and drilling can be said to have a complete cosmetic effect and rust prevention effect.

[Brief explanation of drawings]

Fig. 1 is an explanatory cross-sectional view of a decorative steel plate according to the present invention, Fig. 2 is an explanatory view of the state at the time of transfer in J3 of the present invention, Fig. 3 is an explanatory cross-sectional view of a conventional perforated decorative steel plate, and Fig. 4 is A in Figure 3.
-A' cross-sectional explanatory diagram. 6... Steel plate base material 7... Primer paint layer 8... Colored paint 9... Pattern ink layer 10
...Clear paint layer 11...Transfer paper material 12.
...Transfer roll a...hole Patent applicant
Toppan Printing Co., Ltd. Figure 3

Claims (1)

[Claims] (1) Pre-drill a hole in a predetermined position on a steel plate, apply anti-corrosion paint or colored paint to the end face of the hole, and then place a transfer paper with a pattern printed on it tightly on the steel plate and apply heat and pressure. A method for producing a decorative board, which comprises transferring a pattern onto a steel plate, then peeling off the transfer paper, and optionally coating the transfer layer with a clear paint.