JPH04161272A - Method for painting veneer sheet - Google Patents

Abstract

PURPOSE:To eliminate color irregularity and to prevent the grain depression of a film due to a change with the elapse of time by applying color under coating to a veneer sheet for bonding a base material obtained by lining veneer with a sheet and further applying sealer treatment and sanding sealer treatment thereto in succession. CONSTITUTION:A backing sheet 2 is arranged to veneer composed of an artificial or natural wooden material to be integrated therewith. As the backing sheet 2, Japanese paper or a nonwoven fabric can be used. Subsequently, color undercoating is applied to the obtained veneer sheet 3 by a roll coater painting apparatus 4, a flow coater or a spray means. Next, sealer treatment is applied to the surface of the veneer sheet 3 subjected to the color undercoating by various means such as the roll coater painting apparatus 4. As a sealer, an appropriate polyester or polyurethane type one can be used. The colored painted veneer sheet 6 is continuously arranged to a base material 7 by a vacuum press to be integrated therewith. The veneer 1 and the base material 7 are well bonded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method of painting a board sheet. More specifically, the present invention relates to a method of painting a plate sheet for pasting a substrate, which improves the appearance quality, simplifies the painting process, has no uneven coloring, and prevents the paint film from fading due to changes over time. It is something.

(Prior Art) Wooden materials coated with a mirror finish to provide a high-quality exterior have been used as interior materials for buildings, and various efforts have been made to achieve this goal.

Normally, in high-quality painting of such wood materials, as illustrated in Figure 3, after pasting an untreated artificial or natural plate (A) onto the base material (B) using a vacuum press or the like, Colored coating (1) and clear coating (1) are applied, followed by polishing and puff finishing to form a mirror surface (O).

(Problem to be solved by the invention) However, in such conventional painting methods,
Since the untreated veneer (A) is painted after being attached to the base material (B), it is difficult to apply paint to the veneer with many structural defects such as eye spots and pinholes, especially in the case of artificial wood-based veneers. The suction into the board is significant, causing unavoidable eye damage and having to be painted over and over again. Further, there were disadvantages in that coloring unevenness occurred after painting and the paint film was noticeably faded due to changes over time after painting was completed. Furthermore, in the case of the conventional method, the adhesive force between the attached plate (A) and the base material (B) was also insufficient.

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

This invention was made in view of the above-mentioned circumstances, and it improves the shortcomings of the conventional temporary pasting method for painting wood materials, improves the adhesive strength and appearance quality of the pasted board, and improves the painting process. The purpose of the present invention is to provide a new coating method that can be simplified, has no uneven coloring, and can prevent the paint film from fading due to changes over time after painting.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention is characterized in that a base plate sheet for attaching a base material, which is a sheet-lined plate sheet, is colored as a base material, and is subjected to a sealer treatment and then a sanding sealer treatment. To provide a method for painting a board sheet.

The present invention also provides a method in which a veneer sheet that has been colored by the above method is treated with a sealer, then further treated with a sealer containing a coloring agent, and then treated with a sanding sealer, or a method in which a veneer sheet that has been painted by these methods is polished. Furthermore, the present invention also provides a method for producing a coated wood material by attaching a coated board sheet obtained by these methods to a base material.

The coating method of the present invention will be explained in more detail below with reference to the drawings.

FIG. 1 shows the coating method of the present invention and an example of the process for manufacturing a coated wood material by pasting a plate sheet obtained by this method on a base material. For example, as shown in FIG. 1, (a) First, a backing sheet (2) is arranged and integrated with a board (1) made of artificial wood or natural wood. As this backing sheet (2), Japanese paper, nonwoven fabric, etc. can be used, and in particular, 3
Japanese paper having a weight of about 0 to 40 g/d can be suitably used.

At this time, they can be integrated by flat plate pressing or the like. The pressing conditions at this time include a temperature of 90 to 100.
C, a pressure cuff of 10 kg/ctl, and a treatment time of about 2 to 3 minutes can be adopted.

Further, an adhesive is used in this case, and vinyl acetate resin-based adhesives, urethane resin-based adhesives, and the like are exemplified as suitable adhesives. The amount of coating can be about 5 to 20 glrd. In order to further improve the adhesive strength, adhesives such as urethane emulsion and water-based vinyl urethane, which have good solvent resistance, are effective. The amount of coating at this time is generally about 6 to 10 g/bo.

(b) Next, the obtained plated sheet (3) is subjected to base coloring using a roll coater coating device (4), a flow coater, a spray, or the like.

By applying this base coloring, it is possible to express a pattern that takes advantage of the wood texture of the board (1). As the coloring agent at this time, various types of paints such as solvent type and emulsion type are used. Various colorants are used.

Next, a sealer treatment is applied to the surface of the colored base sheet (3) using various means such as the same roll coater coating device (4) as described above. As a sealer,
Appropriate sealers such as polyester sealers and urethane sealers can be used, and among them, urethane sealers are particularly preferred.

In the case of urethane sealer, apply approximately 2 to 5 g/po. By applying this sealer treatment, it is possible to prevent the paint from being sucked into the plate (1) and to prevent the paint from fading, and also to prevent uneven coloring and changes in the paint film over time.

After drying, the surface of the board sheet (3) is further subjected to a sanding sealer treatment.

In the case of this sanding sealer treatment as well, plywood (5) is used for painting in the same way as the base coloring and sealer treatment described above. In this treatment, for example, polyester sanding sealer, urethane sanding sealer,
A UV curing paint or the like can be used. Particularly preferably, the urethane sanding sealer is applied at 10 to 30 g/rr.
Paint at a rate of about r. Then, the surface of the obtained painted board sheet (6) is polished.

In this way, a sufficiently high quality colored coating is achieved.

Note that for polishing, means such as level sander and puff finishing are employed.

(C) The colored coated plate sheet (6) is then placed and integrated with the base material (7) using a vacuum press.

Attachment board (1) and base Adhesion with material (7) is good.

The pressing conditions at this time are generally a temperature of 90 to 100
℃, and in that case, apply an adhesive such as vinyl acetate resin or urethane resin in an amount of 5 to 20 g/rr. It can be used as a degree.

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 application is generally 6-10g/
It can be made tolerable.

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 may be a temperature of 90 to 100°C, a pressure cuff of up to 10 kg/proof, and a time of about 2 to 3 minutes. This greatly improves adhesive strength.

This application does not require any finishing treatment after the process. Of course, if desired, the surface of the plate (1) may be coated with a polyclear coating. Using polyester paint,
Apply transparent coating at a rate of about 5 to 50 g/m, then
Polish with a level sander etc., and further, for example,
A puff finish may be applied using a triple buff, making about 5 reciprocations.

For the above painting process (C), see Figure 2 (a).
Instead of the above steps shown in FIG. 2(b), a colorant-containing sealer treatment may be performed following drying after sealer treatment, and a sanding sealer treatment may be performed after drying. .

In this case, the colorant-containing sealer is particularly preferably a urethane sealer, and is applied at a rate of about 2 to 5 g/rrr.

Through the finishing treatment described above, it is possible to obtain the painted board sheet of the present invention and a wooden mirror-surfaced board in which the painted board sheet is attached to a base material. Of course, it goes without saying that various detailed aspects of the above steps are possible.

(Function) In the method of the present invention, unlike the conventional method, an untreated board sheet is not directly attached to a base material and painted, but a board sheet that is lined with a sheet is colored and painted. Since it is pasted onto the base material after applying the coating, the painting process is performed only two or three times, which is a very small number of times, which suppresses the suction of the paint into the attached plate and minimizes the movement of the attached plate and the paint film. It is possible to effectively prevent uneven coloring of the coating film and thinning of the eyes. The painting process is streamlined and simplified, and prevents uneven coloring and fading of the wood material and paint film due to changes over time after the painting is completed. Furthermore, the method of manufacturing a wood material of the present invention greatly improves the adhesive strength between the board and the base material.

(Example) A board made of artificial precious wood with a thickness of 0.3 mm was flat-pressed and integrated with a Japanese paper backing sheet via an aqueous vinyl urethane adhesive. Temperature during flat press is 95℃
The pressure was 8 kg/a (and the pressure application time was 2 minutes. The amount of adhesive applied was 8 g/rrr.

Next, the surface of the obtained board sheet is colored,
Treated with urethane sealer at 4g/rrr, and after drying 25
Urethane sanding sealer was applied at a ratio of g/rrr. The painted surface was polished with #400, #600, and #800 level sanders, and finished with a triple buff 5 times.

Next, this colored painted plate sheet was heated to a temperature of 98°C.
, vacuum pressed for 3 minutes on medium density fiberboard (MDF) of 18 mm thickness at a pressure of 4 kg/cnf for integration.

At this time, add 6g/rr of water-based vinyl urethane. It was painted with a coating amount of .

After the vacuum press is completed, the temperature is 100℃ and the pressure cuff is 1 kg.
/cnf for 2 minutes.

If necessary, a polyclear coating was applied at a coating amount of 5 g/IT1', and a triple buff finish was applied.

There was no uneven coloring and the paint film was prevented from fading.

(Effects of the Invention) As explained in detail above, according to the present invention, it is possible to prevent eye thinning of the attached board, suppress uneven coloring of the coating film and change over time, and prevent eye thinning.

Furthermore, the painting process can be simplified. The adhesive strength between the attached plate and the base material is also greatly improved.

It is possible to realize a wood-based painted board with no uneven coloring, a high-class feel, and excellent quality reliability.

[Brief explanation of drawings]

FIG. 1 is a process perspective view illustrating a part of the process of the painting method and the manufacturing method of the painted wood material of the present invention. FIGS. 2(a) and 2(b) are block diagrams showing the coating process of the present invention. Moreover, FIG. 3 is a perspective view illustrating the manufacturing process of a conventional wooden mirror plate. ■...Painted board 2...Japanese paper 3...Board sheet 4...Roll coater coating device 5...stand Board 6...Painted board sheet 7...Base material agent Patent attorney Toshi Nishizawa Central section 2

Claims (4)

[Claims] (1) A method for painting a board sheet, which is characterized in that a board sheet for pasting a base material, which is a board lined with a sheet, is colored, treated with a sealer, and then treated with a sanding sealer. (2) A method for painting a veneer sheet, which comprises coloring the veneer sheet for attaching a base material, which is lined with a veneer, and treating it with a sealer, then further treating it with a sealer containing a coloring agent, and then applying a sanding sealer treatment. (3) A method for coating a board sheet, which comprises polishing a board sheet coated by the method according to claim (1) or (2). (4) A method for producing a coated wood material, which comprises attaching a plated sheet coated by the method according to claim (1), (2) or (3) to a base material.