JPH04349976A - Color painting of plate material - Google Patents

Abstract

PURPOSE:To eliminate color variations and color irregularities and to prevent visible coat shrinkage by applying an undercoat sealing process to a sheet-like plate material, then forming a cured coat with the application of UV sanding sealer and attaching the sheet-like plate material to a base after coloring and surface coating process, followed by finish staining process. CONSTITUTION:A sheet-like plate material, for example, a face plate 1 is treated with an undercoat sealer using a roller coater painting device 3. Next, a UV sanding sealer 4 is applied to form a cured coat. After that, a clear paint 6 is applied to the surface after the application of a coloring agent paint 5, then is dried to obtain a specified color sheet-like plate material. This sheet-like plate material is attached to the base 7 and is further finish-colored. Subsequently, color variations and color irregularities can be eliminated and also a visible coat shrinkage can be prevented. In addition, final color matching process is made feasible.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a method for coloring plate materials. More specifically, the present invention relates to a method for coloring a plate material, which improves the appearance quality, eliminates uneven coloring, and prevents the paint film from fading due to changes over time.

0002

BACKGROUND OF THE INVENTION Conventionally, plate materials coated with colored coatings have been used as interior materials for buildings, and various improvements have been made to the colored coatings for this purpose. Usually, in such colored painting, as illustrated in Fig. 4, an untreated board (artificial or natural) (A)
to a board material etc. pasted to the base material (A) using a vacuum press etc.
Undercoat sealer paint (C) and sanding sealer paint (D) have been applied, and after polishing, colored paint (E) has been applied.

0003

[Problems to be Solved by the Invention] However, in the case of such a conventional colored coating method, since the untreated plate (A) is pasted on the base material (B) and then painted, there are problems such as blurring, Paint may be sucked into tissue defects such as pinholes, and it must be painted multiple times due to eye thinning, and uneven coloring after painting may occur due to insufficient surface smoothness of the board material. This caused large variations in coloring even within a single board and among individual boards. In addition, there was a drawback that the paint film inevitably faded due to changes over time after painting was completed. For this reason, it has been difficult to improve the quality of colored board products using conventional methods. This invention was made in view of the above-mentioned circumstances, and aims to improve the shortcomings of the conventional board coloring method, improve the appearance quality, eliminate uneven coloring, and prevent the fading of the paint film. The purpose of this project is to provide a new color painting method that can

0004

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention applies an undercoat sealer treatment to a sheet-like board material, coats it with a UV sanding sealer to form a cured film, and then colors and coats the surface. To provide a coloring coating method for a board material, which is characterized in that the sheet-like board material is attached to a base material after that, and further coloring is applied as a final color.

[0005] Furthermore, the present invention provides the above method,
It is preferable to perform surface coating treatment after polishing and coloring the UV cured coating, repeating UV sanding sealer coating and curing drying treatment multiple times, and furthermore, giving the final coloring a so-called mirror finish. It is also a mode. Hereinafter, the coating method of the present invention will be explained in more detail by showing examples along with the drawings.

[0006]

EXAMPLE FIG. 1 shows an example of one step of the coating method of the present invention. For example, as shown in FIG.
) First, a board (1) made of artificial wood or natural wood is placed on a base board (2) with or without a backing sheet attached. When using a backing sheet, Japanese paper, nonwoven fabric, etc. can be used, and Japanese paper with a weight of about 30 to 40 g/m2 can be particularly preferably used.

[0007] At this time, the mounting plate (1) and the backing sheet can be integrated by flat plate pressing, etc., and the pressing conditions are a temperature of 90 to 100°C and a pressure of 7 to 10K.
g/cm2, and the processing time can be about 2 to 3 minutes. As the adhesive, a vinyl acetate resin type, urethane resin type, etc. can be used at a coating amount of about 5 to 20 g/m2. (b) Next, the surface of the obtained board is treated with an undercoat sealer using an appropriate means such as a roll coater coating device (3), a flow coater, or a spray, and then UV coated.
Apply sanding sealer (4).

By applying this undercoat sealer treatment and UV sanding sealer (4) coating, the adhesion of the UV cured film is improved, a uniform and smooth surface is formed, and the paint is absorbed into the plate and scratches are prevented. It prevents thinning, enables uniform pattern expression, and suppresses uneven coloring and changes in the paint film over time. The UV-cured coating film-forming board material as a semi-finished product can also be stored as is.

FIG. 2 shows this process in more detail as a process block diagram. As the undercoat sealer treatment, it is particularly preferable to use urethane sealer treatment.
It is preferable to apply the coating at a rate of ~5 g/m2. After drying this, a UV sanding sealer (4) is applied preferably at a rate of 5 to 20 g/m2.

As the UV sanding sealer (4), a polyester UV sanding sealer or the like can be suitably used. For the above-mentioned undercoat sealer treatment and UV sanding sealer (4) painting, the necessary treatment and painting can be performed by means such as a roll coater or hand spray, but when using a roll coater, it is necessary to form a smooth surface. This makes it easier and effective in suppressing uneven coloring.

Furthermore, as shown in FIG. 2, it is preferable that the application of the UV sanding sealer (4) is repeated multiple times as a series of processes including the formation of a cured coating film by UV curing and drying treatment. More specifically, it is preferable to repeat the process 2 to 3 times. A coating film with good surface smoothness is formed by such UV sanding sealer coating and its curing and drying treatment. This coating film suppresses the occurrence of color unevenness in colored coating, and furthermore, the final finishing process of color matching becomes more efficient and easier. (c) Following the treatments in (a) and (b) above, a colorant paint (5) is applied as shown in FIG. In this case as well, the roll coater coating device (
3) Color painting by means such as.

[0012] For the colored coating, for example, a urethane-based paint that has a predetermined color tone is preferably used. The amount of coating at this time is usually preferably about 3 to 20 g/m2. The degree of coloring of this colored coating is preferably 50 to 80% of that of the final product board. Also,
In color coating, as shown in FIG. 2, it is desirable to previously polish the surface of the UV-cured coating film formed in step (b). For example, #400,
By level sander of #600, #800, etc.
And/or it is treated by polishing with a triple buff or the like.

[0013] Also in this color coating, it is more effective to use a roll coater. (d) The surface of the colored plate (1) is then coated with a clear paint (6). In this case as well, an appropriate means such as a roll coater coating device (3) is employed.

[0014] For the clear coating at this time, urethane clear, polyclear, etc. can be used. For example, when using a urethane-based clear coating, it is usually
The coating amount can be 30 g/m2. After this clear coating is completed, it is dried to obtain the desired colored coated sheet material. (e) The sheet-like plate material made of the plate (1) etc. which has been colored and painted in this way is then placed and integrated with the base material (7) by a vacuum press, as shown in FIG.

[0015] The pressing conditions at this time are generally a temperature of about 90 to 100°C, or at that time, an adhesive such as vinyl acetate resin or urethane resin is applied in an amount of 5 to 2.
It can be used at about 0g/m2. In this case as well, the adhesive strength can be greatly improved by using an adhesive with excellent solvent resistance such as urethane emulsion or water-based vinyl urethane. The amount of coating is generally 6-10g/m2
It can be done to a certain extent.

[0016] In order to improve the adhesive force between the attached plate (1) and the base material (7), it is also effective to further perform a flat plate press treatment. The pressing conditions at this time were a temperature of 90 to 100°C;
The pressure can be 7 to 10 kg/m2 and the time can be about 2 to 3 minutes. This greatly improves adhesive strength. (f) Coloring finishing is then performed, and this finishing treatment can be carried out, for example, in accordance with the mirror finishing procedure shown in FIG. That is, first, a colored coating is applied to the surface of the attached plate (1) by spray coating or the like. As the paint at this time, an appropriate paint such as urethane-based paint can be used, and the amount of paint applied is 50% of the finishing color.
% or less, more preferably about 20 to 30% of complementary colors.

[0017] Next, clear coating is applied again. Using polyester paint such as Polyclear, 10 to 50g/
Apply coating at a ratio of approximately m2. For example, the painted surface obtained in this way is #400, #600, #800.
The surface is polished using a level sander or the like, and then finished with a triple buff, for example, with about 5 reciprocations.

[0018] In the method of this invention as described above,
Unlike the conventional method, an untreated sheet material such as a board is not directly attached to a base material and painted, but the sheet material is treated with an undercoat sealer, a UV sanding sealer, a colored paint, and a surface coat. Since it is pasted onto the material, it is possible to suppress the absorption of paint into sheet-like materials such as conventional stick boards, and minimize the movement of stick boards and paint films after painting. In this case, uneven coloring of the paint film and thinning of the eyes can be effectively prevented. Since sufficient curing is possible, it prevents uneven coloring after painting is completed and the appearance of the wood and paint film due to changes over time. Moreover, since a cured coating film is formed using a UV sanding sealer, which is a major feature of this invention, and the surface smoothness is greatly improved, coloring unevenness and coloring variation are effectively suppressed, and a high-quality board material can be obtained. Further, by using a solvent-resistant adhesive in the method of the present invention, the adhesive strength between the plate and the base material is greatly improved. <Painting Example> For example, a 0.3 mm thick artificial wood board is flat-pressed and integrated with a Japanese paper backing sheet via a water-based vinyl urethane adhesive. Temperature during flat plate pressing: 95℃, pressure: 8kg/m2, pressurization time: 2
The amount of adhesive applied was 8 g/m2.

[0019] Subsequently, on the surface of the obtained plate sheet,
Apply an undercoat urethane sealer with a coating weight of 4g/m2, and after drying, apply 2 coats of polyester UV sanding sealer with a coating weight of 20g/m2.
Painted in two coats. The resulting cured film was colored by applying a urethane paint containing a colorant at a rate of 5 g/m2. Furthermore, after polishing with a level sander, urethane clear was applied at a coating amount of 20 g/m2 and dried.

[0020] The coloring at this time was set to be 80% of the finished color. Next, this colored painted board sheet was
At a temperature of 98° C. and a pressure of 4 kg/m 2 , it was vacuum-pressed for 3 minutes on a medium-density fiberboard (MDF) having a thickness of 18 mm to integrate it. At this time, water-based vinyl urethane was applied at a coating amount of 6 g/m2. After vacuum pressing, the temperature is further increased to 100°C.
A flat plate press treatment was performed for 2 minutes at a pressure of 7 kg/cm2.

[0021] Next, urethane coloring was applied so that the coloring was 20% of the final coloring, and then polyclear painting was applied. The obtained painted surface was #400, #600, #8
It was polished with a 00 level sander and buffed 5 times using a triple buff to form a mirror surface. The adhesion of the plate to the base material was improved, there was no uneven coloring, and the paint film was prevented from fading.

For example, as mentioned above, the colored coating method of the present invention is excellent in improving the surface smoothness of the board and suppressing uneven coloring, but this point is This is also clear from the coating comparison shown in Table 1. That is, as shown in Table 1, as is clear from the comparison between the examples of the present invention, Comparative Example 1, which was treated with a sanding sealer other than UV sanding sealer, and Comparative Example 2, which was not subjected to sanding sealer treatment itself, this In the method of the invention, results far superior to conventional methods in evaluating surface smoothness and coloring variation have been obtained.

[0023]

[Table 1]

[0024]

[Effects of the Invention] As explained in detail above, the present invention realizes a coating process for plate materials that suppresses coloring unevenness and variation, suppresses fading of the coating film, and facilitates final color matching. The quality of the obtained colored plate material is extremely good.

[Brief explanation of drawings]

FIG. 1 is a process sectional view illustrating the method of the present invention.

FIG. 2 is a block diagram illustrating the undercoat sealer treatment and UV sanding sealer coating process of the present invention.

FIG. 3 is a block diagram showing a final coloring process.

FIG. 4 is a process perspective view illustrating a conventional painting method.

[Explanation of symbols]

１　　　　　board 2　　　　　　　　　Plate　 3 Roll coater painting equipment 4 UV sanding sealer 5 Colorant paint 6 Clear paint 7 Base material

Claims (6)

[Claims] Claim 1: Applying an undercoat sealer treatment to a sheet-like board material, applying a UV sanding sealer to form a cured coating film, then applying coloring and surface coating, and then attaching the sheet-like board material to a base material, and further finishing coloring. A distinctive method of coloring and painting board materials. 2. The method for coloring a plate material according to claim 1, wherein a surface coating treatment is performed after the UV-cured coating film is polished and colored. 3. The method for coloring a plate material according to claim 1 or 2, wherein the UV sanding sealer coating and the curing and drying treatment are repeated multiple times. 4. The coloring coating method according to claim 1, 2 or 3, wherein the coating treatment is carried out using a roll coater. 5. The method of coloring a board material according to claim 1, 2, 3, or 4, wherein the coloring applied to the cured coating film is applied to a degree of coloring that is 50 to 80% of that of the final product board material. 6. The method of coloring a plate material according to claim 1, 2, 3, 4 or 5, wherein the final coloring is a mirror finish such as colored painting, clear painting, polishing or buffing.