JPH0790630B2 - Veneer manufacturing method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for manufacturing a decorative board used for furniture, interior materials, doors, doors, etc., and more particularly to a method for manufacturing a decorative board that closely resembles natural wood. It is a thing.

[Prior Art] Conventionally, there are many known techniques for manufacturing a decorative board that closely resembles natural wood, but these are roughly classified into two. One is a technique to express the feeling of depth and depth of natural wood,
The other is a technique for expressing a conduit on a natural wood surface. As the former technology, printing with pearl ink,
A glossy hairline is used in a multilayered sheet structure, and the latter technique includes embossing, chemical embossing, and embossing with gloss mat.

[Problems to be Solved by the Invention] However, the above-mentioned conventional technique is a technique for realizing any of a feeling of depth and a feeling of depth of natural wood or a conduit expression of the surface of natural wood. Could not be realized at the same time.

Then, the objective of this invention is providing the manufacturing method of the decorative board which can implement | achieve both the said elements which were not able to be achieved by the prior art simultaneously and in a highly completed form.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the method for manufacturing a decorative board according to the present invention is such that a coating amount inside the conduit is insufficient on a natural wood plywood having a conduit portion on the surface. Then, apply the adhesive to the entire surface, transfer the transfer layer having a wood grain pattern on top of this, then apply the solvent type recoating paint to the entire surface, and reproduce the shape of the conduit by solvent erosion of the transfer layer at the conduit part. It is characterized by doing.

In the present invention as described above, the adhesive force is adjusted between the conduit portion and the other portion by controlling the adhesive application amount of the conduit portion of the base plywood, and this has a wood grain pattern, and After transferring a transfer layer composed of an ink binder whose solvent resistance can be adjusted, and applying solvent-type recoat paint, the transfer layer on the surface will be affected by the diluting solvent of the recoat paint in the conduit where adhesive strength with plywood is insufficient. Since it erodes along the shape of the conduit to form the shape of the conduit, it has a peculiar texture and depth unique to natural wood, and faithfully reproduces the shape of the conduit with natural wood without the conventional embossing process. As a result, a veneer that is very similar to natural wood can be obtained.

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

1A to 1D are cross-sectional views showing an example of a method for manufacturing a decorative board of the present invention in the order of steps.

FIG. 1 (a) shows a natural wood plywood 1 having a conduit portion 2 on its surface.
Indicates. The plywood 1 has a relatively large conduit and is preferably not a very colored material, and various plywood, artificial veneer, decorative veneer with natural wood veneer, and other wood-based base materials having a sense of sag can be used. is there. However, in order to reproduce the texture of the natural wood, which is one of the purposes of this veneer, and the sense of depth, a translucent wood grain pattern transfer layer is used. Therefore, in the case of plywood that has stains or partial discoloration. First, bleach, stop varnish, etc.

Next, an adhesive used for bonding the plywood 1 and the transfer layer 4 is applied over the plywood 1 to form an adhesive layer 3 (first
See FIG. (B)). At this time, it is necessary to apply the adhesive so that the amount of adhesive applied inside the conduit is insufficient and a concave portion is formed in the conduit portion. For this purpose, it is appropriate that the adhesive to be applied is such that its volume change is relatively likely to occur during curing, and that it has such a fluidity and solid content as to cause diffusion to the surrounding wood tissue in the conduit section. Adjust and apply.

As specific examples of the adhesive, emulsion adhesives such as vinyl acetate resin type, ethylene vinyl acetate copolymer resin type, and acrylic vinyl acetate copolymer resin type can be used. Also,
As a coating method, a roll coater (natural coater) is suitable in consideration of sufficient coatability on the non-conduit portion and the coating amount on the conduit portion.

Next, the transfer sheet 6 is superposed on the adhesive layer 3 (see FIG. 1 (c)).

The transfer sheet 6 is composed of a base sheet 5 having a separating property and a grain pattern, and is composed of a transfer layer 4 capable of sufficiently permeating the sag, depth, etc. of a transfer target. The transfer layer 4 is composed of a pattern layer 4a having a wood grain pattern and a surface protective layer 4b which is provided as necessary, so that the coating amount of the adhesive layer 3 may not be insufficient due to the amount of the coating solution used during the recoating after the transfer. The solvent resistance is adjusted to such an extent that the transfer layer of the generated conduit portion is eroded. Ink binders suitable for this property include vinyl chloride-vinyl acetate copolymer resin and acrylic resin.

Further, the base sheet 5 used for the transfer sheet 6 is not particularly limited as long as it is a tough one having separation property, and polyester, polypropylene, polyethylene, polyamide, polycarbonate, polyvinyl chloride, cellulose acetate, nylon, vinylon. Synthetic resin film such as, composite sheet where these films are attached to paper,
Paper coated with urethane resin, aminoalkyd resin, etc. can be used.

The step of FIG. 1 (c) will be described in more detail. After the transfer sheets 6 are superposed on each other with the adhesive layer 3 interposed therebetween, the transfer sheet 6 is sufficiently inserted into the concave portion of the adhesive layer 3 of the conduit portion of the plywood 1. Primary compression is carried out to such an extent that there is no adhesiveness and sufficient adhesion proceeds in the non-conduit portion of the plywood 1, after which this is decompressed and sufficient curing of the adhesive layer 3 is awaited.

After the adhesive layer 3 is cured, the base sheet 5 is removed, and a solvent type recoat paint is applied to the entire surface to provide the recoat layer 7 (see FIG. 1 (d)). At this time, the diluting solvent, the diluting rate, the coating amount, etc. of the recoat paint are adjusted so that the transfer layer 4 may be eroded by the solvent in the conduit portion 2. Solvent-type transparent paints such as urethane-based, acrylic-based, aminoalkyd-based can be used as this recoat paint, and the viscosity can be diluted with a diluting solvent using a coating machine such as roll coater, reverse coater, flow coater, curtain coater, etc. After the adjustment, a recoat layer of about 10 to 30 g / m ^{2 in} terms of solid content is provided. By applying the recoating paint, the transfer layer 4 on the surface of the conduit portion 2 is eroded by the solvent along the shape of the conduit to faithfully reproduce the shape of the conduit, and in the non-conduit portion, the recoat layer 7 is applied without erosion of the transfer layer 4. Be worn.

After recoating, wiping or topcoating can be carried out as necessary after waiting for sufficient curing of the recoat layer 7.

[Examples] Specific examples of the present invention will be shown below.

Vinyl acetate emulsion adhesive (viscosity: 15,000 to 20,000 CPS '/ 30 ℃ evaporation residue: 35 on a 2.5 m / m lauan plywood)
%) Is further diluted with water by 5%, and then coated with a roll coater at about 65 to 90 g / m ² (wet).

A 5 μm thick acrylic resin surface protective layer prepared in advance and a pattern layer imitating oak material printed with a semitransparent ink using a vinyl chloride-vinyl acetate copolymer resin as a binder are provided. After wet-laminating a transfer sheet using a 25 μm-thick untreated polyethylene terephthalate film as a base sheet, primary pressing (30 minutes) was performed with a cold pressing at a pressing pressure of ² kgf / cm ² , and an adhesive was used. After waiting for room temperature curing, the base sheet was removed.

The solvent resistance of this transfer layer was set to about 5 to 10 times by thinner rubbing with a diluting solvent of the recoat layer paint mixed with isobutyl acetate / toluene / ethyl acetate = 50/25/25.

Next, the obtained decorative board having a transfer layer on the obtained surface was adjusted with a urethane sanding paint made of an acrylic polyol resin by the above-mentioned diluting solvent for about 15 seconds ± 3 seconds (Ford cup # 4), and then a curtain coater was used. 110 ~ 1
About 70 g / m ² (wet) (solid content 20% ± 5%) was applied to obtain erosion of the transfer layer along the plywood conduit portion. After the coating material was cured, wiping and top coating were performed.

The veneer finally obtained was a veneer that had the texture and depth of the natural tree and was very similar to the natural tree in which the conduit shape of the natural tree was faithfully reproduced.

[Effects of the Invention] As described in detail above, according to the method for manufacturing a decorative board of the present invention, the adhesive force is adjusted between the conduit portion and other portions by controlling the adhesive application amount of the conduit portion of the base plywood. The transfer layer having a wood grain pattern is transferred to it, and then a solvent type recoating paint is applied to the conduit, so that the transfer layer is eroded along the shape of the conduit by the diluting solvent of the recoating paint in the conduit part. , As a whole, it has a peculiar texture and depth feeling of natural wood, and it can faithfully reproduce the conduit shape of natural wood without the need for an embossing process as in the past, and obtain a decorative board that closely resembles natural wood. It has an excellent effect that it can.

[Brief description of drawings]

1A to 1D are cross-sectional views showing an example of a method for manufacturing a decorative board of the present invention in the order of steps. 1 ... Plywood 2 ... Conduit part 3 ... Adhesive layer 4 ... Transfer layer 5 ... Base sheet 6 ... Transfer sheet 7 ... Recoat layer

Claims (1)

[Claims] 1. A natural wood plywood having a conduit portion on its surface is coated with an adhesive so that the coating amount inside the conduit is insufficient, and a transfer layer having a grain pattern is transferred onto the adhesive. Next, a method for manufacturing a decorative board, characterized in that a solvent-type recoat paint is applied to the entire surface and the shape of the conduit is reproduced by solvent erosion of the transfer layer at the conduit.