JP2790370B2 - Wood material coating method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for coating wooden materials. More specifically, the present invention improves the appearance quality and the adhesive strength of the attached plate to the base material, simplifies the coating process, has no coloring unevenness, and can prevent the coating film from becoming thin due to aging. The present invention relates to a method for coating a material.

(Prior Art) Conventionally, as interior materials for buildings and the like, wood materials with high-quality mirror-finished appearance have been used, and various devices have been devised for that purpose.

Usually, in such a high-quality coating of a wooden material, for example, in the case of wood-grain mirror coating, as shown in FIG. 4, an untreated plate (artificial or natural) (a) is used as a base material (a).
After being adhered by a vacuum press or the like, a colored coating (c) and a polyclear coating (d) are applied, and a mirror surface (e) is formed by polishing and buffing.

(Problems to be Solved by the Invention) However, in such a conventional mirror-finish coating method, since the untreated plate (A) is applied after being adhered to the base material (A), there is no blurring or pinning. In the case of a board with many tissue defects such as holes, especially artificial wood-based boards,
Significant suction of paint into the attached plate, unavoidable thinning, must be painted many times. Further, there is a disadvantage that coloring unevenness occurs after coating, and that the coating film becomes noticeably thin due to a change with time after completion of coating. Moreover, in the conventional case, the adhesive strength between the attached plate (A) and the substrate (A) was insufficient.

For this reason, with the conventional method, there is a limit to the improvement in productivity, and it is difficult to maintain and improve the product quality.

The present invention has been made in view of the above circumstances, improves the disadvantages of the conventional high-quality coating method for woody materials, improves the appearance quality and the adhesive strength of the attached plate, and simplifies the coating process. It is an object of the present invention to provide a new coating method that can be applied, has no coloring unevenness, and can prevent thinning of a coating film due to aging after coating.

(Means for Solving the Problems) In order to solve the above-described problems, the present invention performs a sealing process on a sheet with a sheet backed on the sheet,
The present invention provides a method for coating a wooden material, which comprises applying a pre-colored coating to the same color as the finish coating, then applying the coating to a substrate, and further performing a coating finish.

Further, the present invention provides the above method, in which the pre-colored coating is performed by performing a colorant-containing sealer process and a sanding sealer process after the sealing process of the attached sheet, and the pre-colored coating is performed at a finish time of 70 to 80. % Is also a preferred embodiment.

Hereinafter, the coating method of the present invention will be described in more detail with reference to the drawings.

FIG. 1 shows an example of one step of the coating method of the present invention. For example, as shown in FIG. 1, (a) First, a backing sheet (2) is arranged and integrated on an attached plate (1) made of artificial wood or natural wood. As the backing sheet (2), Japanese paper, nonwoven fabric, or the like can be used, and in particular, about 30 to 40 g / m ² of Japanese paper can be suitably used.

At this time, they can be integrated by flat plate pressing or the like. The pressing conditions at this time are as follows: temperature 90-100
C., a pressure of 7 to 10 kg / cm ² , and a processing time of about 2 to 3 minutes.

In this case, an adhesive is used, and examples thereof include an adhesive based on vinyl acetate resin and urethane resin. The application amount can be about 5 to ²⁰ g / m ² . In order to further improve the adhesive strength, an adhesive such as urethane emulsion and aqueous vinyl urethane having good solvent resistance is effective. The coating amount at this time is generally about 6 to 10 g / m ² .

(B) Next, the obtained attached sheet (3) is subjected to a sealer treatment by a suitable means such as a roll coater coating device (4), a flow coater, a spray or the like, and then a preliminary coloring coating is performed. This pre-colored coating is positioned as a pre-coat before the finish coating and the mirror coating.

By applying this sealer treatment and preliminary coloring coating,
It prevents the paint from being sucked into the attached plate and thinning, enables uniform pattern expression, and suppresses color unevenness and time-dependent changes in the coating film. Further, the number of colored coating steps can be significantly reduced and simplified as compared with the conventional method. It becomes possible to store the pre-colored coated sheet sheet (5) as a semi-finished product as it is. Moreover, this allows sufficient curing to be performed.

The base plate (6) is used for the sealer treatment and the pre-color coating, and the pre-color coating is performed in the same color as the finish coating. FIG. 2 shows this process in more detail as a process block diagram.

As the sealer treatment, a urethane sealer treatment is particularly preferable, and the coating is suitably performed at a rate of ^{2 to 5} g / m ² .
After drying, a urethane sealer treatment containing a colorant is preferably performed at a rate of ^{2 to 5} g / m ² .

After drying, a sanding sealer treatment is performed. As the sanding sealer, a urethane sanding sealer of 10 to 30 g / m ² is preferably used, but a polyester sanding sealer, a UV curable paint, or the like may be used. Preferably, at least 50% of the finish, 70-80%
Color up to.

Thereafter, polishing is performed as necessary. Level sander,
Means such as buffing are employed.

(C) The attached sheet (5) thus pre-colored and coated is then disposed on the substrate (7) by a vacuum press and integrated as shown in FIG.

The pressing condition at this time is generally 90 to 100 ° C.
In this case, an adhesive such as vinyl acetate resin or urethane resin can be used at a coating amount of about 5 to ²⁰ g / m ² .

Also in this case, the adhesive strength is greatly improved by using an adhesive having excellent solvent resistance, such as urethane emulsion and aqueous vinyl urethane. The coating amount is generally 6 to 10 g / m ²
Degree.

In order to improve the adhesive strength between the attachment plate (1) and the base material (7), it is effective to further perform flat plate pressing.

The pressing conditions at this time are as follows: temperature 90-100 ° C, pressure 7-10k
g / m ² and time can be about 2 to 3 minutes. Adhesion is greatly improved.

Subsequently, a paint finish is performed. The paint finish process can be performed according to any of the procedures shown in FIGS. 3 (A) and 3 (B). That is, (A): First, a clear coating is applied to the surface of the attached plate (1). Using a polyester paint or the like, apply a transparent coating at a rate of about 10 to 30 g / m ² . Thereafter, 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, for example, an appropriate paint such as a urethane-based paint can be used, and the amount of the paint applied is adjusted so as to give 50% or less of the final finish, more preferably about 20 to 30%.

Subsequently, clear coating is performed again. A coating of about 40 to 50 g / m ² is applied using a polyester paint such as polyclear.

The coated surface obtained in this way is, for example, # 40
Polish with a level sander of about 0, # 600, # 800, etc., and further, for example, finish about 5 reciprocations with a triple buff.

Alternatively, (B): after attaching the attached sheet to the base material (7), applying a colored coating, and then applying a clear coating with a polyclear coating amount of 40 to 50 g / m ² , and then applying the same as above. Polishing, buffing and finishing.

By the above method, the coated wood material of the present invention can be obtained. Of course, it goes without saying that various details of the above steps are possible.

(Operation) In the method of the present invention, the uncoated plate is directly adhered to the base material and coated without applying a sheet, as in the conventional method. In order to stick to the substrate after applying the paint,
Suppression of paint in the pasting plate as in the past can be suppressed, minimizing the movement of the pasting plate and coating film after painting, especially in the case of mirror finish, uneven coloring and thinning of the coating film Can be effectively prevented. Since sufficient curing is possible, it is possible to prevent unevenness in coloring after coating is completed and the thinning of wood materials and coating films due to aging. Further, the use of a solvent-resistant adhesive in the method of the present invention greatly improves the adhesive strength between the attached plate and the substrate.

(Example) An attached plate made of an artificial precious wood having a thickness of 0.3 mm was integrated with a Japanese paper backing sheet through an aqueous vinyl urethane adhesive by flat plate pressing. The temperature during flat plate pressing was 95 ° C., the pressure was 8 kg / cm ² , and the pressing time was 2 minutes. 8g /
It was m ^2.

Subsequently, a urethane sealer was applied at a coating amount of 4 g / m ^{2 on} the surface of the obtained attached sheet, and after drying, a colorant-containing urethane sealer was applied at a rate of 5 g / m ² and colored. . Further, a urethane sanding sealer was applied at a coating amount of 20 g / m ² and polished with a level sander.

 This pre-coloring was 80% of the finish.

Next, the urethane sealer-treated and pre-colored coated sheet sheet was treated at a temperature of 98 ° C. and a pressure of 4 kg / cm ² for 18 m.
It was mounted on a medium-density fiberboard (MDF) having a thickness of m by vacuum pressing for 3 minutes and integrated.

At this time, aqueous vinyl urethane was applied at a coating amount of 6 g / m ² .

After the vacuum press, the temperature is further increased to 100 ° C and the pressure is set to 7 kg / cm ²
For 2 minutes.

Then, poly clear coating at a coverage of 15 g / m ^2, colored paint so that 20% of the coloring of the final colored, furthermore,
Polyclear coating was performed at an application amount of 40 g / m ² . The obtained coated surface was polished with a # 400, # 600, and # 800 level sander, and subjected to five reciprocal buffs with a triple buff.

The adhesive strength of the attached plate to the base material is improved, there is no coloring unevenness,
Thinning of the coating was also prevented.

(Effects of the Invention) According to the present invention, as described in detail above: 1) Prevention of thinning of a coated plate and sufficient curing time can be obtained by preliminary coloring coating, so that coloring unevenness and temporal change of a coating film can be obtained. Can be suppressed and eye thinning can be prevented.

2) Furthermore, simplification of the coating process can be achieved by using a pre-painted attached sheet. The board sheet with pre-colored coating as a semi-finished product can be stored as it is.

3) By using a solvent-resistant adhesive or the like, the adhesive strength between the attached plate and the base material is greatly improved.

It is possible to realize a wood-coated plate such as a mirror-finished plate having high quality and excellent quality reliability without coloring unevenness.

[Brief description of the drawings]

FIG. 1 is a process perspective view illustrating a part of the process of the method for coating a woody material according to the present invention. FIG. 2 and FIGS. 3 (A) and 3 (B) are block diagrams illustrating the steps of preliminary coloring coating and painting finishing, respectively. FIG. 4 is a perspective view illustrating a process for manufacturing a conventional wooden mirror plate. DESCRIPTION OF SYMBOLS 1 ... With board 2 ... Washi 3 ... With board sheet 4 ... Roll coater coating equipment 5 ... With pre-colored coating board sheet 6 ... Base plate 7 ... Base material

Claims (6)

(57) [Claims] (1) A method for coating wood material, comprising: applying a sheet with a sheet backing to the sheet, performing a sealer treatment, pre-color-painting the same color as the finish coating, attaching the sheet to a base material, and further applying a paint finish. 2. The coating method according to claim 1, wherein the preliminary color coating is performed by a colorant-containing sealer treatment and a sanding sealer treatment. 3. 70% to 80% of the finish in pre-color coating
The coating method according to claim 1, wherein the coloring is performed. 4. The coating method according to claim 1, wherein a clear coating, a coloring coating, and a clear coating are performed after attaching the attached sheet to the substrate. 5. The coating method according to claim 1, wherein the colored sheet and the clear coating are applied after attaching the attached sheet to the substrate. 6. The method according to claim 1, wherein a solvent-resistant adhesive is used for forming the attached sheet and for attaching the sheet to a substrate.
The painting method described.