JP2597218B2 - Painted wood board and method of manufacturing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a painted wood plate coated with a UV-curable resin paint and a method for producing the same.

<Prior Art> A painted wood plate used as a surface material for furniture and fittings is conventionally known. For example, Japanese Patent Publication No. 2-15384 discloses an ultra-thin single-piece natural wood whose surface is polished smoothly. A backing material is adhered to the back surface of the plate material, and a first coat layer is formed on the surface of the veneer material by ultraviolet irradiation to prevent air from being generated by dispersing air from the conduit in advance. In addition, on the first coat layer, at least a second coat layer formed by curing by ultraviolet irradiation is shown. Both the first coat layer and the second coat layer in the coating plate according to the prior art are coating layers made of a paint mainly composed of an ultraviolet-curable resin. The two-coat layer is similarly formed by curing by ultraviolet irradiation.

<Problems to be Solved by the Invention> By the way, ultraviolet curable resins are generally used without a solvent because they cure by a radical reaction. Therefore, they have high viscosity and large surface tension, so that they do not easily penetrate into the interior of the veneer material. Things. For this reason, when the first coat layer is formed by curing in the above-described conventional technique, it becomes easier to trap air in a recess on the surface of the veneer material due to a conduit groove or a crack. In addition, air or the like entrained in the resin in the coating process is not easily radiated to the outside, and air remains. Therefore, in the above prior art, in the process of forming and curing the first coat layer, the air in these single plate material surface recesses is radiated in advance to prevent the subsequent generation of air bubbles. The amount is set to a small amount so as not to hinder the above operation. Although the coating amount is not specifically specified, it is generally recognized that the coating amount is 10 g / m ² or less. It is impossible to fill the recesses on the surface of the veneer material with the first coat layer having such an extremely small coating amount, and therefore, there is a disadvantage that a smooth surface cannot be obtained unless the second coat layer is formed thick. .

In addition, since the first and second coat layers in the above-described conventional technique are separately formed by hardening, the respective coat layers are formed without being mixed at their interfaces. Therefore, there is a disadvantage that delamination of these coat layers easily occurs at the interface.

<Means for Solving the Problems> The present invention was conceived after devising in order to solve the above-mentioned drawbacks of the prior art, and provided a conduit groove, A painted wood board characterized in that a first ultraviolet-curable resin layer and a second ultraviolet-curable resin layer for filling a surface concave portion due to cracks and the like are simultaneously formed by curing.

Further, in the method for producing a painted wood board according to the present invention, a solvent-diluted ultraviolet-curable colored resin paint is filled in the surface of the wood board to which the backing material is adhered, such as a conduit groove or a crack in the wood board surface. After applying and impregnating as described above, the solvent in the colored resin paint and the air in the wood board are dissipated by heating, and then, if necessary, the colored resin paint is semi-cured to a gel state by irradiating ultraviolet rays, or ultraviolet rays are applied. In the state where the colored resin paint is uncured without irradiation, after further applying an ultraviolet curable resin paint on the surface of the veneer plate, it is irradiated with ultraviolet light to simultaneously cure the colored resin paint and the resin paint. And

The wood board is obtained by cutting a raw wood or a flitch of a tree material such as cedar, pine, toga, cypress, agathis, chestnut or the like with a cutting device such as a rotary lace, a half rotary lace, and a slicer.

A flexible sheet-like material is adhered as a backing material to the back surface of the wood board via an adhesive. As the flexible sheet material as the backing material, for example, Japanese paper, nonwoven fabric, synthetic fiber paper, chemical fiber paper and the like are suitably used. As the adhesive, a synthetic resin adhesive such as a urea resin, a urethane resin, an epoxy resin, a melamine resin, an isocyanate, a vinyl acetate resin, or a modified resin thereof is suitably used. Adhesion of the backing material, for example, spread the glue board after applying the adhesive to a wide flexible sheet-like material, or continuously apply the glue to the continuous sheet-like material and then apply the glue plate continuously. They are arranged in a long shape, and are pressure-bonded by a compression device such as a cold press, a hot press, or a roll press. The adhesive may be applied to the back surface of the wood plate instead of being applied to the sheet-like material, or may be applied to both of the adhesive surfaces in some cases.

The wood veneer lined with the flexible sheet material is then cut into predetermined dimensions to obtain a wood veneer sheet. In some cases, this wood board sheet is thrown into a cutting device to form a finger pattern at each end of the wood board in the fiber direction, and the finger patterns are fitted to each other to perform finger joint, and the finger joint part is bonded. It is also possible to use a tape or an adhesive to bond a plurality of wood sheets to form a continuous wood sheet.

The surface of the resulting veneer sheet or continuous veneer sheet is painted in the following manner. That is, the veneer sheet is thrown into a coating device such as a roll coater, a flow coater, a spray, or the like, and an ultraviolet curable colored resin paint diluted with an organic solvent and optionally colored is applied to the veneer plate surface. Acrylic, acrylic urethane, polyester, epoxy, urethane and the like are used as the colored resin paint. By diluting the colored resin paint with an organic solvent, the viscosity of the paint is reduced, and the surface recesses such as conduit grooves and cracks of the wood plate can be sufficiently filled with permeation. Further, the colorant can be sufficiently dispersed and mixed in the paint.

After applying the colored resin paint, it is put into a drying device to dry the colored resin paint. The drying here is performed in order to dissipate the organic solvent in the paint and the air in the wood board. That is, as described above, the coloring resin coating is diluted with an organic solvent to reduce its viscosity, and is applied to replace the air in the wood plate material. It expands and floats in the low-viscosity resin paint, and its emission is promoted. Thus, a wood plate without residual air is obtained.

The wood plate coated with the colored resin paint is put into an ultraviolet irradiation device as necessary, and the colored resin paint is semi-cured to a gel state, or the colored resin paint is uncured without being irradiated with ultraviolet light. As the state, further roll coater,
Put into coating equipment such as flow coater, spray, etc.
Apply paint. The second paint is an ultraviolet-curable resin paint, and the same acrylic paint, acrylic urethane paint, polyester paint, epoxy paint, urethane paint or the like as the above colored resin paint is used. Since the second paint is applied in a semi-cured or uncured state of the colored resin paint, it is preferable to use a resin paint similar to the colored resin paint in order to improve the adhesion.

The wood plate to which the resin paint has been applied is then put into an ultraviolet irradiation device and irradiated with ultraviolet light. By this ultraviolet irradiation, the colored resin paint and the resin paint applied to the surface of the wood board are simultaneously subjected to radical reaction curing.

As described above, on the surface of the veneer plate to which the backing material has been adhered, an ultraviolet-curable colored resin layer that fills surface recesses due to conduit grooves or cracks, and further, an ultraviolet-curable resin layer on the surface is simultaneously irradiated with ultraviolet light. A painted veneer cured by irradiation is obtained. After sanding the surface of the painted plate, if necessary, one or more layers of an ultraviolet curable resin paint may be applied and formed.

<Function> By applying an ultraviolet-curable colored resin paint having a low viscosity by solvent dilution to the surface of the wood board, the colored resin paint penetrates into surface recesses such as conduit grooves and cracks of the wood board,
Replacement with the air in the wood board is performed. The heat remaining when the colored resin paint is dried expands the air remaining in the wood board, floats in the colored resin paint, and promotes air dissipation. Thus, a wood plate without residual air is obtained. After the solvent of the colored resin paint is diffused by drying, the paint is applied to the surface thereof in a semi-cured or uncured state, and the colored resin paint and the resin paint are simultaneously irradiated with ultraviolet light. Radical curing.

<Example> A wood board was bonded to a backing material, which is a flexible sheet material, via an adhesive layer while performing finger joint by fitting finger portions formed at ends of the wood ends in the fiber direction. Thus, a continuous wood board sheet was obtained. This continuous wood board sheet is put into a double roll coater having a sponge roll and a rubber roll as an application roll, and a colored resin paint obtained by diluting an acrylic ultraviolet curable paint with the same amount of thinner is applied to the wood board surface. Applied. The viscosity of the colored resin paint was adjusted to 16 to 19 seconds with Zagn cup No. 3 manufactured by RIGOSHA and applied and impregnated so as to fill the surface recesses of the wood plate.
After applying the colored resin paint, put it in the drying device and set the temperature to 30.
After drying to 100100 ° C., the solvent in the colored resin paint and the air in the wood board were dissipated. Further, it was put into a double roll coater having two rubber rolls as application rolls, and a resin paint composed of a clear acrylic ultraviolet-curable paint was applied on the uncured colored resin paint. This resin paint was adjusted to a viscosity of 20 to 29 seconds with Zahn Cup No. 5 manufactured by RIGOSAH, and the applied amount was 9 to 30 g / m ² . Then, it was put into an ultraviolet irradiation device, and the uncured colored resin coating material and the resin coating material were simultaneously subjected to radical reaction curing to produce a continuous coated wood plate.

<Effects of the Invention> Since there is no residual air in the wood plate, cracks, warpage, twist, etc., of the board due to expansion and contraction of the wood plate after coating are not generated. Since the colored resin paint and the resin paint applied to the surface of the plate are simultaneously cured by irradiation with ultraviolet rays, the interface between these resin paint films is not formed, and the resin paint is fixed to the surface of the plate in an integrated manner. It does not occur.

Claims (3)

(57) [Claims] 1. A first UV-curable resin layer and a second UV-curable resin layer for simultaneously filling a surface recess due to a conduit groove or a crack on a surface of a wood board to which a backing material is adhered. A painted wood plate characterized by being formed. 2. The painted plate according to claim 1, wherein said first UV-curable resin layer is made of a colored resin paint which is arbitrarily colored. 3. The surface of the plate to which the backing material has been adhered is coated and impregnated with a solvent-diluted UV-curable colored resin paint so as to fill the surface recesses due to conduit grooves and cracks on the surface of the plate. Heat to disperse the solvent in the colored resin paint and the air in the wood of the veneer, and then, if necessary, irradiate ultraviolet rays to partially cure the colored resin paint to a gel state, or In a state where the paint is in an uncured state, after further applying an ultraviolet-curable resin paint to the surface of the wood board, the colored resin paint and the resin paint are simultaneously cured by irradiating ultraviolet rays. Production method.