JP2001047560A - Wood decorative board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To upgrade moistureproofness and water resistance by laminating a hot-melt adhesive layer on one surface of a wood base material of a moistureproof sheet having the hot-melt adhesive layer by a thermal adhesion process. SOLUTION: A moistureproof sheet 10a comprises a base material layer 1 and a hot-melt adhesive layer 2 composed of a tackifier which is made up of an ethylene-vinyl acetate copolymer as a main component and paraffin wax, microcrystalline wax, a low molecular weight polyethylene, isobutylene, a rosin derivative or petroleum resin and the like. This moistureproof sheet 10a is pressed onto one surface or both surfaces of a wood base material 6 with the help of a heating roll made up of silicone rubber or the like and both thermally bonded with the hot-melt adhesive layer 2. Thus, superb moistureproofness and high water resistance are ensured and the wood decorative board free from warpage due to moisture is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a decorative wooden board used for a door or the like which is prevented from warping due to moisture.

[0002]

2. Description of the Related Art Conventionally, as a wooden decorative board which is prevented from warping due to moisture, a moisture-proof sheet composed of paper / polyethylene / paper is laminated on one or both sides of a wooden base material using an adhesive. A wooden veneer having such a configuration is known. However, the above-described wooden decorative board has a drawback that the moisture resistance sheet made of paper / polyethylene / paper is inferior in water resistance and peels between paper layers or between paper and polyethylene. Further, since the moisture-proof sheet is laminated on the wooden substrate using an emulsion type adhesive or the like, there is a disadvantage that the laminating step is complicated and cannot be efficiently produced.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a decorative wooden board which has good moisture resistance and water resistance and can be easily manufactured by thermal bonding.

[0004]

Means for Solving the Problems The present invention is a wooden decorative board in which a moisture-proof sheet having a hot-melt adhesive layer is laminated on at least one surface of a wooden substrate by heat bonding with the hot-melt adhesive layer. In this case, since the moisture-proof sheet having the hot-melt adhesive layer has excellent moisture-proof properties and water resistance, it is possible to obtain a wood decorative board that does not warp due to moisture. Also, since the moisture-proof sheet can be easily manufactured only by heat bonding to the wooden base material, the process can be simplified and the cost can be reduced.

In the above wooden decorative board, the moisture-proof sheet is constituted by a base layer and a hot-melt adhesive layer, or is constituted by a base layer, a thermoplastic resin layer and a hot-melt adhesive layer. It can be used as a low-cost decorative veneer with excellent properties and water resistance.

In the above wooden decorative board, the moisture-proof sheet is constituted by a base layer, a picture layer, a thermoplastic resin layer and a hot-melt adhesive layer, so that the surface properties, moisture-proof properties,
A wood decorative board having a picture layer excellent in water resistance can be obtained.

In the above wooden decorative board, the moisture-proof sheet is composed of a transparent resin layer, a picture layer, a base material layer, a thermoplastic resin layer and a hot melt adhesive layer, so that the transparent resin layer has more excellent design. And a wooden decorative board having a picture layer excellent in surface physical properties, moisture resistance and water resistance can be obtained.

In the above-described wooden decorative board, the moisture-proof sheet is heat-bonded to the wooden substrate by forming the hot-melt adhesive layer from a hot-melt type resin containing an ethylene-vinyl acetate copolymer as a main component. Since the temperature can be lower than in the case of a general thermoadhesive resin, the thermoadhesion process can be made more efficient.

In the above-mentioned wooden decorative board, the moisture-proof sheet is strongly adhered to the wooden substrate even if the surface of the wooden substrate is rough, by making the thickness of the hot melt adhesive layer 20 to 50 μm. be able to.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing a first embodiment of the present invention, FIG. 2 is a sectional view showing a second embodiment of the present invention,
FIG. 3 is a cross-sectional view showing a third embodiment of the present invention, FIG. 4 is a cross-sectional view showing a fourth embodiment of the present invention, and FIG. 5 is a schematic view showing a step of thermally bonding a moisture-proof sheet to a wooden base material. 1 is a base material layer, 2 is a hot melt adhesive layer, 3 is a thermoplastic resin layer, 4 is a transparent resin layer, 5 is a picture layer, 6 is a wooden base material, 7 is a heating roll, and 8 is a pressure roll. , 9 is a support roll, 10, 10
a, 10b, 10c, and 10d represent moisture-proof sheets, respectively.

As shown in FIG. 1, the structure of the first embodiment of the present invention comprises a base material layer 1, a hot melt adhesive layer 2, a wooden base material 6, a hot melt adhesive layer 2, and a base material layer 1. This is a laminated wooden board in which a moisture-proof sheet 10a comprising a base material layer 1 and a hot-melt adhesive layer 2 is heat-bonded to both surfaces of a wooden base material 6 with the hot-melt adhesive layer 2. In the first embodiment, the moisture-proof sheet 10a is thermally bonded to both surfaces of the wooden substrate 6, but it may be configured to be thermally bonded to only one surface of the wooden substrate 6.

As shown in FIG. 2, a second embodiment of the present invention comprises a base material layer 1, a thermoplastic resin layer 3, a hot melt adhesive layer 2, a wood base material 6, and a hot melt adhesive layer 2 as shown in FIG. , A thermoplastic resin layer 3 and a base material layer 1, and a moisture-proof sheet 10 b composed of the base material layer 1, the thermoplastic resin layer 3 and the hot melt adhesive layer 2 This is a wooden decorative board thermally bonded by the melt adhesive layer 2. Second
In the embodiment, the moisture-proof sheet 10b is thermally bonded to both surfaces of the wooden substrate 6, but it may be configured to be thermally bonded to only one surface of the wooden substrate 6.

As shown in FIG. 3, the structure of the third embodiment of the present invention comprises a base material layer 1, a picture layer 5, a thermoplastic resin layer 3, a hot melt adhesive layer 2, a wood base material 6, and a hot melt material. The moisture-proof sheet 10c has a configuration in which the adhesive layer 2, the thermoplastic resin layer 3, and the base layer 1 are laminated, and includes the base layer 1, the picture layer 5, the thermoplastic resin layer 3, and the hot melt adhesive layer 2. Is thermally bonded to one surface of the wooden base material 6 with the hot melt adhesive layer 2, and the base material layer 1, the thermoplastic resin layer 3, and the hot melt adhesive layer 2 are bonded to the other surface of the wooden base material 6. This is a wooden decorative board obtained by thermally bonding a moisture-proof sheet 10b with a hot melt adhesive layer 2. In the third embodiment, it is also possible to adopt a configuration in which a moisture-proof sheet 10a comprising a base material layer 1 and a hot-melt adhesive layer 2 is thermally bonded to the other surface of the wooden base material 6. The third embodiment is a decorative wooden board having a picture layer, and can be used as an exterior material such as a door.

As shown in FIG. 4, the structure of the fourth embodiment of the present invention comprises a transparent resin layer 4, a picture layer 5, a base layer 1, a thermoplastic resin layer 3, a hot melt adhesive layer 2, a wood base A material 6, a hot melt adhesive layer 2, a thermoplastic resin layer 3, and a substrate layer 1 are laminated, and a pattern layer 5 is provided on one surface of the substrate layer 1.
And a transparent resin layer 4 formed on the other surface.
Moisture-proof sheet 10d on which the hot melt adhesive layer 2 is formed
Is thermally bonded to one surface of the wooden substrate 6 with the hot melt adhesive layer 2 and the substrate layer 1 is bonded to the other surface of the wooden substrate 6.
And a moisture-proof sheet 10b comprising a thermoplastic resin layer 3 and a hot-melt adhesive layer 2 and a hot-melt adhesive layer 2 thermally bonded thereto. In the fourth embodiment, the wooden substrate 6
A moisture-proof sheet 10a composed of a base material layer 1 and a hot-melt adhesive layer 2 may be bonded to the other surface by heat. The fourth embodiment is a wooden decorative board having a picture layer, and can be used as an outer surface material such as a door.

As the hot melt adhesive, ethylene-
A composition having a vinyl acetate copolymer as a main component and a tackifier composed of paraffin wax, microcrystalline wax, low molecular weight polyethylene, polyisobutylene, a rosin derivative or a petroleum resin is used. By using a hot-melt adhesive having the above composition, when laminating a moisture-proof sheet on a wooden substrate, by pressing with a heating roll made of heated silicon rubber or the like, a hot-melt adhesive for the moisture-proof sheet Can be easily bonded by melting them, and the heat bonding process can be performed efficiently without deteriorating due to the heat at the time of heat bonding the wooden base material. In addition, since the hot melt adhesive has a solid content of 100%, the hot melt adhesive layer can be formed to a thickness of 20 μ to 50 μ by a method such as roll coating or extrusion coating. Sufficient adhesive strength can be obtained for the substrate.

As the base layer of the moisture-proof sheet, a moisture-proof sheet
In the case of 10a, a film such as a medium density polyethylene, a high density polyethylene, and a polypropylene containing an ethylene component, which has excellent adhesion to a hot melt adhesive, has a higher melting point than the hot melt adhesive, and has excellent heat resistance, can be used. In the case of the moisture-proof sheet 10b, a film having excellent heat resistance such as biaxially oriented polyethylene terephthalate, biaxially oriented polypropylene, and unoriented polypropylene can be used. In the case of the moisture-proof sheets 10c and 10d, films having excellent printability and heat resistance such as biaxially oriented polyethylene terephthalate and biaxially oriented polypropylene can be used. As the thermoplastic resin layer 3, polyethylene, ethylene-vinyl acetate copolymer, or the like having good adhesion to the hot melt adhesive layer 2 can be used.

As the transparent resin layer, those having abrasion resistance and stain resistance are preferable. Acrylic resin, urethane resin, cellulose resin, melamine resin, aminoalkyd resin, epoxy resin, ultraviolet curable resin Although ionizing radiation-curable resins and the like can be used, UV-curable resins are particularly preferable. The glossiness of the surface can be arbitrarily set by the transparent resin layer, and the surface can be formed to have a three-dimensional effect by forming irregularities on the surface, so that a wooden decorative board with extremely excellent design properties can be obtained.

As a method for laminating a moisture-proof sheet to a wood substrate by heat bonding, for example, as shown in FIG. The sheet 10 is overlapped so that the hot-melt adhesive layer is in contact with the wooden substrate 6, and is pressed between the heating roll 7 and the pressure roll 8. By applying pressure between the heating roll 7 and the pressure roll 8, the hot melt adhesive layer of the moisture-proof sheet 10 can be melted and adhered to the wood substrate 6. As the heating roll 7, a silicon rubber roll or the like heated from the outer surface by an electric heater or the like is used, and as the pressing roll 8, a metal roll is used. Preheating may be performed by bringing the moisture-proof sheet 10 into contact with a heated metal roll or the like. The lamination process is completed by cutting the moisture-proof sheet 10 after the moisture-proof sheet 10 is thermally bonded to the wooden substrate 6.

[0019]

EXAMPLE 1 A 20 μm biaxially stretched polyethylene terephthalate film was laminated with a 20 μm extruded polyethylene layer, and an ethylene-vinyl acetate copolymer, paraffin wax and a tackifier were applied on the polyethylene layer at a ratio of 5: 4: 1. Was coated to a thickness of 30 μm to prepare a transfer sheet. Using the moisture-proof sheet prepared above, 8 m / cm.
In addition to heat bonding at a speed of one minute, the moistureproof sheet prepared above was also heat bonded to the other surface of the MFD under the above conditions to prepare a wood decorative board. 910mm × 2100m obtained
910 mm × 2100 using two wood-made decorative boards and a laminated veneer having a width of 30 mm × a thickness of 21 mm as a core material.
mm flash door, 5 degrees Celsius, humidity 70%
The room A was placed on a partition wall at the boundary between the room A and the room B at a temperature of 30 degrees Celsius and a humidity of 30%, and the warpage of the central portion after the elapse of 24 hours was measured. The opening and closing of the door was not hindered, and very good results were obtained.

[0020]

Example 2 A 20μ biaxially stretched polyethylene terephthalate film was printed on one surface by gravure printing with an acrylic resin ink using an acrylic resin ink, and an ultraviolet curable resin was used on the printed surface. A transparent resin layer having a thickness of 20 μm was formed, an extruded polyethylene layer having a thickness of 20 μm was laminated on the other surface of the biaxially stretched polyethylene terephthalate film, and a hot melt adhesive was formed on the surface of the polyethylene layer to a thickness of 30 μm as in Example 1. Was coated to prepare a transfer sheet. Using the transfer sheet prepared above, a 2.5 mm thick M
While thermally bonding to one surface of the FD with a silicon rubber roller maintained at a surface temperature of 210 ° C. at a speed of 8 m / min,
Using the transfer sheet prepared in Example 1, the MFD was thermally bonded to the other surface of the MFD under the above conditions to prepare a wood decorative board provided with a printed layer having a lamellar pattern. A flash door was prepared by using the two obtained wooden decorative boards so that the printed layer was on the outer surface, and a test was performed in the same manner as in Example 1. As a result, the size of the warp in which the room A was convex was 1 mm, which was extremely large. Good results were obtained.

[0021]

According to the present invention, a moisture-proof sheet having a hot-melt adhesive layer is laminated on at least one surface of a wooden substrate by heat bonding with the hot-melt adhesive layer. Since excellent moisture resistance and water resistance can be obtained by the moisture-proof sheet, it is possible to obtain a wood decorative board which does not warp due to moisture. Also,
Since the moisture-proof sheet can be easily manufactured only by heat bonding to the wooden base material, the process can be simplified and the cost can be reduced.
In the above-mentioned wood decorative board, the moisture-proof sheet is constituted by a base layer and a hot-melt adhesive layer, or is constituted by a base layer, a thermoplastic resin layer, and a hot-melt adhesive layer, so that the moisture-proof property and It can be a low cost wooden decorative board with excellent water resistance. In the above wooden decorative board, the moisture-proof sheet is composed of a base layer, a picture layer, a thermoplastic resin layer and a hot melt adhesive layer, or a transparent resin layer, a picture layer, a base layer, a thermoplastic resin layer and a hot By adopting a constitution including the melt adhesive layer, a wood decorative board having a picture layer excellent in surface physical properties, design properties, moisture resistance and water resistance can be obtained. In the above wooden decorative board,
The hot-melt adhesive layer is made of a hot-melt type resin having an ethylene-vinyl acetate copolymer as a main component, so that the temperature at which the moisture-proof sheet is heat-bonded to the wood substrate is reduced to a temperature of a general heat-bondable resin. Since the temperature can be lower than in the case, the heat bonding step can be made more efficient. In the above wooden decorative board, the thickness of the hot melt adhesive layer is set to 20 to 50 μm.
With this configuration, the moisture-proof sheet can be strongly adhered to the wooden substrate even when the surface of the wooden substrate is rough.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a first embodiment of the present invention.

FIG. 2 is a sectional view showing a second embodiment of the present invention.

FIG. 3 is a sectional view showing a third embodiment of the present invention.

FIG. 4 is a sectional view showing a fourth embodiment of the present invention.

FIG. 5 is a schematic view showing a step of thermally bonding a moisture-proof sheet to a wooden substrate.

[Explanation of symbols]

Reference Signs List 1 base material layer 6 wood base material 2 hot melt adhesive layer 7 heating roll 3 thermoplastic resin layer 8 pressure roll 4 transparent resin layer 9 support roll 5 picture layer 10, 10a, 10b, 10c,
10d moisture proof sheet

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (reference) B32B 33/00 B32B 33/00 F term (reference) 2B002 AA01 AA12 AA13 BA01 BB07 DA06 2B200 AA01 BA01 BA16 BB20 CA11 DA04 EA06 EC18 EE13 EF11 FA24 FA31 HA05 2B250 AA11 BA05 CA11 DA04 EA02 EA13 FA21 FA31 FA37 GA03 4F100 AK01B AK01C AK01E AK68D AP00A BA03 BA04 BA05 BA06 BA07 BA10A BA10B BA10C BA10E CB03 J04 J04 H04B04 J04 GB04J04 GB

Claims (7)

[Claims] 1. A wooden decorative board comprising: a moisture-proof sheet having a hot-melt adhesive layer laminated on at least one surface of a wooden substrate by heat bonding with the hot-melt adhesive layer. 2. The wood decorative board according to claim 1, wherein the moisture-proof sheet comprises a base material layer and a hot melt adhesive layer. 3. The wood decorative board according to claim 1, wherein the moisture-proof sheet comprises a base material layer, a thermoplastic resin layer, and a hot melt adhesive layer. 4. The wood decorative board according to claim 1, wherein the moisture-proof sheet comprises a base layer, a picture layer, a thermoplastic resin layer, and a hot melt adhesive layer. 5. The wood decorative board according to claim 1, wherein the moisture-proof sheet comprises a transparent resin layer, a picture layer, a base material layer, a thermoplastic resin layer, and a hot melt adhesive layer. 6. The wood decorative board according to claim 1, wherein the hot melt adhesive layer is made of a hot melt type resin containing an ethylene-vinyl acetate copolymer as a main component. . 7. The thickness of the hot melt adhesive layer is 20.
The wood decorative board according to any one of claims 1 to 6, wherein the thickness is from 50 to 50 µm.