JPH0211316B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a wood grain decorative board that exhibits a clear contrast wood grain pattern on its surface by coloring.

There are very few pieces of pine wood that are called precious wood with good grain contrast and no flaws, and in general, they often have some sort of defect, large or small, and the wood grain contrast is not as sharp. . For this reason, various studies have been conducted on methods of making materials similar to precious wood by using such common inexpensive materials and subjecting them to some kind of processing.

One of the typical methods is to
A relatively low-grade softwood veneer such as rice cedar is used, and its surface is ground by brushing to create a wood grain pattern with concave areas in the relatively soft spring wood and convex areas in the hard summer wood. By processing the ivy surface into an uneven surface and then painting the concave portions with a color darker than the convex portions, a decorative board with a clear wood grain contrast in which the color tones of the spring wood portion and the summer wood portion are reversed is obtained. A method called the so-called inversion method is known. However, in this case, the color tones of the natural spring and summer wood parts of the wood are reversed, and this poses a problem in that it is not possible to present a more natural appearance. That is,
Originally, the summer wood part of wood is narrower than the spring wood part, but due to the above reversal, the summer wood part becomes wider than the spring wood part, so the result is However, there were unavoidable flaws that made it unnatural in appearance.

The present invention aims to solve these drawbacks by causing a partial slowdown in the coating speed of the coating film applied to the surface, and utilizing the resulting difference in the cohesive force of the coating film. The original summer wood is colored relatively darker than the spring wood.

That is, in this invention, the surface of a decorative original plate is processed into an uneven shape that represents a wood grain pattern, and then a transparent or translucent colored sealer colored in the spring wood color is applied to the uneven surface, thicker in the concave parts and thinner in the convex parts. It is characterized by applying a transparent or semi-transparent colored paint colored in the color of summer wood almost uniformly over the entire surface and drying it. Further explanation will be given below based on the illustrated embodiment.

In FIG. 1, a decorative original plate 1 used in this invention
is not limited to wood boards, but generally wood with wood grains is used,
In particular, the distinction between spring wood part 2 and summer wood part 3 is clear,
Wood species with relatively large density differences, such as softwood materials such as cedar, toga, and pine, are preferably used. Although it is permissible to use such a decorative base plate 1 as a single plate or bar, it is generally processed into a thin plate with a thickness of about 0.2 to 1.0 mm, as shown in Fig. 1. Use the appropriate base material such as plywood, fiberboard, laminated wood, etc. 4
It is used by attaching it to a surface using a known adhesive.

First, the surface of the decorative original board 1 is processed into an uneven shape representing a wood grain pattern, as shown in FIG. When natural wood like the one described above is used as the decorative base plate 1, the surface is ground by brushing with a metal brush or nylon brush, or by blasting by spraying an abrasive material, etc. to create the soft spring wood portion 2. It is most common and advantageous to form a concave-convex shape with the concave portion 5 being the hard summer material portion 3 and the convex portion 6 being the hard summer material portion 3. However, the present invention is not limited to this, and mechanical embossing or chemical embossing, in which the decorative original plate 1 is compressed through an elastic body and the spring portions 2 are depressed, may be used. Recess 5
The desired effect can be expected by forming the depth to be about 0.1 to 0.5 mm.

Next, a transparent or translucent colored sealer 7 made of, for example, vinyl urethane resin and colored in the color of the spring material is applied to the uneven surface of the decorative original plate 1. Moreover, this sealer 7 is especially
As shown in the figure, a recess 5 on the surface of the decorative original plate 1
The coating is applied more on the convex portions 6, that is, thicker, and less on the convex portions 6, that is, thinner. In order to apply the sealer 7 in different amounts to the concave portions 5 and the convex portions 6 in this manner, first, as shown in FIG. Immediately after applying it uniformly to the entire surface, while it is still not drying, strong printing pressure is applied to the colored sealer 7 of the same or similar composition using an elastic roll made of hard rubber or the like. It is easiest and most reliable to apply the sealer by applying the sealer to fill most of the recesses 5 of the sealer 7. Incidentally, a pearl pigment may be appropriately added to the sealer 7 in order to bring out the surface gloss characteristic of wood, that is, the so-called terry appearance. Usually the amount added is 0.5 ~
It is around 2.0%.

After applying the sealer 7 thickly to the concave portions 5 and thinly to the convex portions 6 as described above, it is then dried to the touch. This degree of dryness is such that although the sealer 7 in the recess 5 is still in a soft state that has not yet hardened, it is dry enough that it does not stick even when touched with a fingertip. This is a particularly important matter; if drying is insufficient or excessive, the desired effect cannot be achieved satisfactorily.

After drying to the touch, apply a relatively large amount of transparent or semi-transparent colored paint 8 such as polyurethane based on the color of the summer wood over the entire surface and almost uniformly as shown in FIG. 5 on the surface of the sealer 7. and dry this.

Then, during the process of applying and drying the colored paint 8, the following phenomenon occurs. That is, decorative original plate 1
In the recesses 5 on the surface of the sealer 7, there is a large amount of touch-dry sealer 7, which has not yet been sufficiently dried, and is thick, whereas on the protrusions 6 there is less and only a thin layer of sealer 7, so the former part dries slowly. , the latter part dries quickly. Moreover, since the sealer 7 swells due to the application of the colored paint 8, the drying of the colored paint 8 is slow in the concave portions 5 and quick in the convex portions 6, resulting in relative drying. This causes a difference in drying speed. Due to this slow drying rate in the evenly applied colored paint 8 coating, the cohesive force of the coating acts on faster drying areas earlier than slow drying areas, and this causes As shown by the arrows in Figure 6, the paint film is drawn and moves from areas where drying is slow to areas where drying is fast. For this reason, as shown in FIG. 6, the coating film of the colored paint 8 dries to a thick state in which more paint is collected on the convex portion 6 than on the concave portion 5, as shown in FIG. This portion is colored relatively darker than the concave portion 5. Furthermore, since this density difference is caused by a change in the thickness of the colored paint 8, the boundary between the light-colored part and the dark-colored part becomes unclear and blurred, and the appearance of the grain resembles that of natural wood. It exhibits a sharp change in shading.

As is clear from the above description, according to the present invention, unlike the conventional inversion method, the convex portions corresponding to the summer wood portions of the wood grain pattern are expressed in a darker color than the concave portions corresponding to the spring wood portions, and the original Since it can color the appearance of the summer wood, it can create a clear contrast in color density between the concave and convex parts without causing the disadvantages of the above-mentioned inversion method, and can also eliminate defects in the decorative original board. It is possible to provide a decorative board having a hidden wood grain pattern that more closely resembles that of natural precious wood.

The wood-grain decorative board according to the present invention may further have a protective transparent synthetic resin coating layer coated on its surface, if necessary. The type of coating layer to be formed is appropriately selected in relation to the intended use of the decorative board.

Next, examples of this invention will be shown.

Example: A 0.6 mm thick straight-grained veneer made of Japanese pine with unclear annual rings was pasted on 5.0 mm thick plywood, and the surface of the veneer was brushed parallel to the fiber direction using a rolled nylon brush. Brushing and grinding was performed to form an uneven shape with concave portions in the spring material portion and convex portions in the summer material portion. Next, a colored translucent sealer (viscosity cut-off) made of vinyl urethane colored in the spring material color is applied to the uneven surface of this veneer using a soft rubber roll with a rubber hardness of 35°.
18 seconds) was applied almost uniformly over the entire surface at a coating amount of about 7.5 g/ ^m2 , and then immediately applied to the rubber hardness.
Using an 80° hard rubber roll, the same sealer as above was applied at a rate of about 3.0 g/m ² while applying strong printing pressure. As a result, the uneven surface of the veneer was coated with a thick layer of sealer on the concave portions and a very thin layer on the convex portions. Therefore, this was dried for about 10 minutes at room temperature until it was dry to the touch, and then a transparent colored paint (with a viscosity cut-off) consisting of a polyurethane paint colored in the summerwood color was applied on the sealer coating layer.
30 seconds) was applied almost uniformly over the entire surface at 18 g/m ² using a flow coater. After that, it was initially dried at 30℃ for 10 minutes, and then finished dried at 45℃ for 30 minutes.
The desired wood grain pattern decorative board was obtained. This decorative board is
It has a wood grain pattern with a clear contrast, with the summer wood on the convex parts being dark colored and the spring wood on the concave parts relatively lighter in color, creating an appearance that closely resembles that of fine natural wood with no flaws. It was a presentation.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention in the order of steps; FIG. 1 is a cross-sectional view of a decorative original plate adhered to a substrate; FIG. 2 is a cross-sectional view of the decorative original plate with an uneven surface; Figure 3 is a sectional view of the surface after the first application of sealer, Figure 4 is a sectional view of the state after the sealer application process, Figure 5 is a sectional view of the state immediately after the application of transparent colored paint, FIG. 6 is an enlarged sectional view of the product after drying the transparent colored paint. 1... Decorative original board, 2... Spring wood part, 3... Summer wood part, 5... Concave part, 6... Convex part, 7... Colored sealer, 8... Colored paint.

Claims (1)

[Scope of Claims] 1. The surface of the decorative original plate is processed to have an uneven shape representing a wood grain pattern, and then a transparent or translucent colored sealer colored in the color of spring wood is applied to the uneven surface thickly in the concave portions and thinly in the convex portions. Manufacture of a wood-grain decorative board characterized by painting it to a uniform color, drying it to the touch, and then applying a transparent or semi-transparent colored paint colored in the summer wood color almost uniformly over the entire surface and drying it. Method. 2. Claim 1, characterized in that natural wood with wood grains is used as a decorative base plate, and its surface is processed by brushing or the like to have an uneven shape with concave portions in the spring wood portion and convex portions in the summer wood portion. The method of manufacturing the wood grain decorative board described. 3. To apply a colored sealer, first apply the sealer evenly over the entire surface of the decorative base plate, and then immediately apply a sealer of the same or similar composition by applying strong printing pressure using a hard elastic roll. A method for manufacturing a wood grain decorative board according to claim 1 or 2, which is carried out by: