JPH0825569A - Production of decorative laminate - Google Patents

Abstract

PURPOSE:To stably produce a high-quality decorative laminate by a relatively simple operation process, enhance a productivity, and eliminate a need of bonding a backing material by a method wherein a veneer with a transparent synthetic resin sheet bonded is placed on a surface of a substrate the surface of which is coated with an adhesive, and k both are clamped to be bonded to each other. CONSTITUTION:A veneer 3 is laminated on a surface of a substrate 1 through an adhesive layer 2. A transparent synthetic resin sheet as a surface protective layer 4 is laminated and bonded on a surface of the veneer 3 through an adhesive 5 that is transparent or becomes transparent when curing. On the surface of the surface protective layer 4, recesses 6, 6' are so engraved by embossing as to artificially express tracheae or the like. The recesses 6 are formed within the range of the thickness of the surface protective layer 4. The recesses 6' are formed deep into the veneer 3 through the surface protective layer. The inside of the these recesses is coated with a color coating material 7 to be colored.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a decorative board used as a building material or a furniture board in a house.

[0002]

2. Description of the Related Art Conventionally, a decorative veneer is pasted on the surface of a substrate with an adhesive, then a colored paint is applied to the surface of the decorative veneer to apply a colored coating, and then a top coat is applied and overcoated. It is widely practiced to apply a paint to form a surface protective layer to form a decorative plate.

[0003]

In the above-mentioned prior art, in order to give the surface protective layer a sufficient function, it is necessary to repeatedly apply the overcoating material and thickly apply it, which complicates the working process.

Further, in the case of attempting to perform thick coating using a paint having a high viscosity, if the coating speed or the drying speed is high, uniform coating cannot be performed, and foaming occurs during drying. Although all of these problems are avoided by slowing down the speed, a decrease in productivity is inevitable.

Under the circumstances as described above, it has been attempted to give up the thick coating of the top coat and form a relatively thin surface protective layer. In this case, the strength of the surface protective layer becomes weak. Therefore, there are problems that the surface is easily scratched, the abrasion resistance is poor, and a deep makeup surface cannot be obtained.

Further, in the conventional method for manufacturing a decorative veneer, the decorative veneer is liable to be warped or rubbed due to drying shrinkage, and a backing material is adhered to prevent this, but Inevitably, the process is complicated and the manufacturing cost is increased when the backing material is attached.

[0007]

SUMMARY OF THE INVENTION The present invention aims to solve the above-mentioned problems of the prior art, and more specifically, to stably supply a high-quality decorative board by a relatively simple work process. The object of the present invention is to improve the productivity and to eliminate the problem of drying shrinkage of the decorative veneer while eliminating the need to attach the backing material.

The method for producing a decorative veneer according to the present invention, which has been devised in earnest to achieve the above object, is a method for producing a decorative veneer in a wet state obtained by cutting wet wood, when it is transparent or cured. A transparent synthetic resin sheet is placed via an adhesive that becomes transparent, and pressure-bonding is performed while maintaining the wet state of the decorative veneer, and then the obtained transparent synthetic resin sheet-applied decorative veneer is bonded to the surface. It is characterized in that it is placed on the upper surface of the substrate coated with the agent, pressure-bonded and at the same time the wet decorative veneer is dried, and further, embossing is applied from the surface to form a recess. ..

In carrying out the method of the present invention, first, wet wood is cut to obtain a wet decorative veneer. That is,
Wet wood with a water content above the fiber saturation point, such as raw wood, boiled wood obtained by boiling wood, laminated blocks to which multiple raw wood blocks are adhered, and boiling laminated blocks in which multiple wood blocks are laminated and then boiled, slicer, rotary Wet veneer such as slice veneer, rotary veneer, half land veneer, sword veneer, etc. by cutting and cutting with a cutting device such as lace, half land rotary lace, circular saw, band saw, plane saw. It is used in the method of the present invention without drying.

The thickness of the decorative veneer used is generally
It is preferably in the range of 0.15 to 5 mm.

An adhesive which becomes transparent or becomes transparent when cured is applied to the surface of the wet decorative veneer using an application device such as a sprayer, a spreader, a bar coater, a flow coater or a curtain coater.

Adhesives used at this time which are transparent or transparent when cured include vinyl acetate resin, urea resin, melamine resin, phenol resin, acrylic resin, urethane resin, epoxy resin and resordinol resin. It is an adhesive of a system, a polyester resin type, an isocyanate type, etc., and is used alone or as a mixed type adhesive arbitrarily mixed.

A wet-curing type adhesive such as a polyurethane resin type adhesive can be used. Since the wet-curing type adhesive cures at room temperature in a wet state, it is particularly preferably used in carrying out the method of the present invention using a decorative veneer in a wet state.

If necessary, a coloring agent may be added to the adhesive to be used as a colored adhesive.

The adhesive used is transparent or becomes transparent at least when it is cured, and it is the transparent synthetic resin sheet that is attached to the surface of the decorative veneer via the adhesive. In the obtained veneer, the veneer surface is exposed on the veneer surface without being hidden.

A transparent synthetic resin sheet is placed on the surface of a decorative veneer coated with an adhesive that becomes transparent or becomes transparent when cured.

As the transparent synthetic resin sheet, polyethylene sheet, cellophane, acetate sheet, polyvinyl chloride sheet, polypropylene sheet, polystyrene sheet, polyester sheet, nylon sheet, saran sheet, acrylic sheet and the like are preferably used. Generally, a transparent synthetic resin sheet is used as having a thickness of 0.005 to 1 mm. The transparent synthetic resin sheet is used for each decorative veneer or continuously over a plurality of decorative veneers.
It is placed on the adhesive application surface of the decorative veneer.

As the transparent synthetic resin sheet, an arbitrarily colored colored transparent synthetic resin sheet can be used. Alternatively, a colorless or colored transparent synthetic resin sheet having an arbitrary pattern printed on the back surface may be used. This makes it possible to emphasize the wood texture, express new tree species, express depth, or express a mosaic pattern or abstract pattern, in combination with the original surface design of a decorative veneer. The designability as is further improved.

A cold-pressed, hot-pressed, roll-pressed, laminator-lapping, edging machine is applied to a wet decorative veneer on which a transparent synthetic resin sheet is placed via an adhesive which becomes transparent or becomes transparent when cured. By pressing using a pressing device such as a vacuum press, the transparent synthetic resin sheet is bonded to the surface of the decorative veneer to form a surface protective layer. The pressure bonding at this time is performed so as to maintain the wet state of the decorative veneer.

Next, the adhesive is applied to the surface of the substrate by using a coating device such as a sprayer, a spreader, a bar coater, a flow coater or a curtain coater. As this adhesive, a vinyl acetate resin-based, urea resin-based, melamine resin-based, phenol resin-based, epoxy resin-based, isocyanate-based, etc. adhesive is used alone or as a mixed adhesive. If necessary, talc, calcium carbonate, clay, inorganic powder such as titanium white, wheat flour, wood powder, plastic powder, colorant, insect repellent, fungicide, etc. may be added to and mixed with the adhesive. . The adhesive generally has a solid content of 35 to 80% and a coating amount of 50 to 300 g / m ^2.
It is applied in the range of.

As the substrate, plywood, wood board, wood fiber board, wood shaving board, laminated wood, single board laminated board or the like is used alone or as a laminated board which is arbitrarily laminated. In addition, the substrate is arbitrarily cut, and a skirting board, a rim, a molding, a door, or a window on which the surface and the mouth end are optionally decorated by using a cutting machine such as a router or a cutter for chamfering or chamfering. It can also be used as a base material for face materials, sculpture materials, etc.

On the surface of the substrate coated with the adhesive, the transparent synthetic resin sheet-coated decorative veneer obtained as described above is placed with the transparent synthetic resin sheet as the upper surface.

In the method of the present invention, a transparent synthetic resin sheet-coated decorative veneer is attached to the surface of a substrate via an adhesive. Instead of applying the adhesive to the surface of the substrate as described above, Alternatively, together with this, an adhesive may be applied to the back surface of the decorative synthetic resin sheet-coated veneer. The transparent synthetic resin sheet-attached decorative veneer may be attached to each leaf of the substrate or may be attached continuously to a plurality of substrates.

In this manner, the substrate on which the transparent synthetic resin sheet-coated decorative veneer is placed on a leaf-by-leaf basis or continuously through the adhesive is used for hot pressing, roll pressing, laminator, wrapping, edging machine, The transparent synthetic resin sheet-attached decorative veneer is adhered to the substrate surface by pressing with a sticking device such as a vacuum press. At the time of this pressure-bonding, since high heat acts on the decorative veneer which has been kept wet, the decorative veneer is dried at the same time as the bonding on the substrate.

Next, embossing is applied from the surface side of the surface protective layer made of a transparent synthetic resin sheet to form a recess. The embossing is performed using an embossing board, an embossing roll, a wire brush, a sander or the like. The depth of the recess is arbitrary, and the depth of the recess is within the thickness range of the surface protection layer, or the depth of the recess reaching the decorative veneer through the surface protection layer, or a combination thereof. A recess is formed.

The recesses engraved in the surface protective layer represent the recesses such as conduit grooves, hairlines, and wormholes of the natural wood material in a pseudo manner. Is emphasized, and the designability as a decorative board can be greatly improved.

Further, when the transparent synthetic resin sheet is attached to the surface of the decorative veneer, since an adhesive which is transparent or becomes transparent when cured is used, the recesses such as conduit grooves on the surface of the decorative veneer are transparent. Since it is exposed from the surface of the decorative board through the layer and the transparent surface protective layer, the recesses of the decorative veneer itself and the recesses formed on the surface of the surface protective layer are combined. Thus, it is possible to exhibit a very characteristic design property.

Further, after the colored coating material is applied to the whole surface of this decorative plate by using the above-mentioned coating device, preferably immediately after that, using a reverse roll coater, the surface of the surface protective layer excluding the recesses is removed. By removing the colored paint applied to the part and leaving the colored paint only in the recesses, the inside of the recesses of the surface protection layer can be colored. As a result, the recesses in the surface protective layer are more emphasized and the design is improved.

[0029]

The surface protective layer is formed by using a transparent synthetic resin sheet and adhering it onto a decorative veneer through an adhesive which becomes transparent when it is transparent or cured. The surface protective layer corresponds to the thickness of the transparent synthetic resin sheet used and is formed to have a uniform thickness.

The decorative veneer is used in a wet state which is not subjected to a drying treatment, and the transparent synthetic resin sheet is pressure-bonded while the wet state is maintained, and the transparent synthetic resin sheet is attached to the surface. Since the decorative veneer is dried at the same time when the decorative veneer is pressure-bonded to the surface of the substrate via the adhesive, the decorative veneer is not warped or flared due to drying shrinkage.

On the surface of the surface protective layer, a recess is formed by engraving a conduit groove or the like so as to emphasize the texture of wood.

[0032]

EXAMPLE FIG. 1 schematically shows a decorative board obtained by the above-described method of the present invention. A decorative veneer 3 is laminated on a surface of a substrate 1 with an adhesive layer 2 interposed therebetween, and the decorative veneer 3 is formed. The surface protective layer 4 is formed by laminating and bonding a transparent synthetic resin sheet on the surface of the sheet through an adhesive that becomes transparent or becomes transparent when cured. 5 is a transparent adhesive layer.

On the surface side of the surface protective layer 4, recesses 6 and 6'representing a conduit groove or the like in a pseudo manner are formed by embossing. In this embodiment, the recess 6 is formed within the thickness range of the surface protective layer 4, and the recess 6 ′ is formed so as to penetrate the surface protective layer and reach the decorative veneer 3. Further, in this embodiment, the inside of these recesses is colored and painted with the coloring paint 7.

[0034]

According to the method of the present invention, the surface protective layer having a uniform thickness can be easily formed on the surface of the decorative veneer in the decorative board by a simple working process. The decorative board obtained by the method of the present invention has excellent strength, abrasion resistance and design, and is suitably used for building materials and furniture.

Further, the thickness of the surface protective layer can be adjusted by changing the thickness of the transparent synthetic resin sheet used. In this case, the manufacturing equipment does not need any change.

Furthermore, in the method of the present invention, a wet synthetic veneer is used and a transparent synthetic resin sheet is attached to its upper surface, and the wet decorative veneer is placed on a substrate via an adhesive. Since the decorative veneer is dried at the same time as the press-bonding is performed, the warp and the rust due to the drying shrinkage of the decorative veneer do not occur, and it is not necessary to use a backing material, and the yield is significantly improved.

Further, the surface of the surface protective layer is engraved with a recess for simulating a conduit groove or the like to emphasize the texture of wood.

[Brief description of drawings]

FIG. 1 is a sectional view schematically showing a decorative board according to the present invention.

[Explanation of symbols]

 1 Substrate 2 Adhesive Layer 3 Decorative Veneer 4 Surface Protection Layer (Transparent Synthetic Resin Sheet) 5 Transparent Adhesive Layer 6, 6'Concave 7 Colored Paint

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location B32B 33/00 7148-4F

Claims (6)

[Claims] 1. A transparent synthetic resin sheet is placed on an upper surface of a wet veneer obtained by cutting wet wood through an adhesive that is transparent or transparent when cured, and the veneer is wet. After pressing and adhering while maintaining the state, place the obtained transparent synthetic resin sheet-attached decorative veneer on the upper surface of the substrate with the adhesive applied on the surface, and press-bond and simultaneously apply makeup in a wet state. A method for producing a decorative board, which comprises drying a single plate, and further embossing the surface to engrave and form a recess. 2. The method for manufacturing a decorative board according to claim 1, wherein the transparent synthetic resin sheet is a colored transparent synthetic resin sheet which is arbitrarily colored. 3. The method for producing a decorative board according to claim 1, wherein a pattern pattern is printed on the back surface of the transparent synthetic resin sheet. 4. The method for manufacturing a decorative board according to claim 1, wherein the adhesive that is transparent or becomes transparent when cured is a colored adhesive that is arbitrarily colored. 5. The method for producing a decorative board according to claim 1, wherein the adhesive that is transparent or becomes transparent when cured is a wet-curing type adhesive. 6. The colored coating is applied to the surface in which the recess is formed by engraving, and then the colored coating applied to the surface portion excluding the recess is removed so that the colored coating remains only in the recess. The method for manufacturing a decorative board according to any one of claims 1 to 5, wherein: