JPH09239901A - Decorative plate and manufacturing method thereof - Google Patents

Abstract

(57) [Summary] [Object] To provide a decorative board suitable for industrial production and capable of preventing the surface decorative veneer from cracking. [Structure] A decorative board in which a decorative veneer 4 is attached to the surface of a substrate 1 via an elastic adhesive 2 and a glass fiber sheet 3, and the delamination strength of the surface decorative veneer and the delamination strength of the substrate surface Also reduces the delamination strength of the elastic adhesive,
It is characterized in that the surface decorative veneer is attached so as to be peeled off in the elastic adhesive layer. As the elastic adhesive, it is preferable to use a mixture of an elastomer adhesive and at least two kinds of thermosetting resin adhesives. In this case, one of the at least two thermosetting resin adhesives has a curing temperature of less than 100 ° C, and the other thermosetting resin adhesive has a curing temperature of 100 ° C or more.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a decorative board and a method for manufacturing the same.

[0002]

2. Description of the Related Art Decorative boards made by sticking a decorative veneer on the surface of a substrate have been widely used for furniture, wall materials, furniture surface materials and the like.

[0003]

However, in recent years, it has become difficult to obtain a name tree used as a decorative veneer constituting the decorative veneer, and there is an increasing tendency to reduce the thickness of the decorative veneer to improve the yield. There is.

When such a thin decorative veneer is adhered to the surface of a plywood mainly used as a substrate, the plywood of the substrate and the decorative veneer repeatedly contract and expand with a change in the water content for a long period of time. However, since the shrinkage and expansion rates of the two are greatly different, countless cracks occur on the surface of the veneer, impairing the aesthetics of the veneer and reducing the commercial value. In addition, cracks that occur in veneers constituting the plywood itself extend to decorative veneers adhered to the surface, and there has been a problem that dry veneers are generated in the veneer veneers.

As a solution to such a problem, there is a decorative board in which a non-sizing paper is adhered to the surface of a substrate with an adhesive and a decorative veneer is further adhered onto the unsized paper. 2 layers of adhesive were provided in the manufacturing process.
Since it was necessary to form a layer and two heating presses were required to cure the adhesive layer, the manufacturing process was complicated and the productivity was unavoidable.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems in the prior art, and an object of the present invention is to provide a decorative board suitable for industrial production and having an excellent effect of preventing dry cracking of the decorative veneer. And

That is, the present invention is a decorative board having a decorative veneer adhered to the surface of a substrate via an elastic adhesive and a glass fiber sheet, and has a delamination strength of the surface-decorated veneer and a delamination of the substrate surface. The delamination strength of the elastic adhesive is made smaller than the strength, and the surface decorative veneer is attached so as to be peeled in the elastic adhesive layer.

As the elastic adhesive, it is preferable to use a mixture of an elastomer adhesive and at least two kinds of thermosetting resin adhesives. In this case, one of the at least two thermosetting resin adhesives has a curing temperature of 10
The temperature is lower than 0 ° C, and the curing temperature of the other thermosetting resin adhesive is 100 ° C or higher.

The method of manufacturing a decorative board according to the present invention is
Characterized by applying an elastic adhesive to the surface of a substrate, placing a glass fiber sheet on the surface, further placing a decorative veneer, and then heating and pressing the whole to adhere the decorative veneer And

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION As the substrate of the decorative board of the present invention,
Wood-based boards such as plywood, wood fiberboard, wood shavings and veneer laminated boards are used.

As a decorative veneer to be attached to the surface of the substrate,
A natural veneer obtained by cutting natural wood or an artificial veneer is used.

The elastic adhesive is applied to the surface of the substrate by using a coating device such as a roll coater or a spreader. The amount of adhesive applied is preferably in the range of 8 to 20 g / scale.

As the elastic adhesive, it is preferable to use a mixture of an elastomer adhesive and at least two kinds of thermosetting resin adhesives.

As the elastomer adhesive constituting the elastic adhesive, natural rubber type, chlorinated rubber type, butyl rubber type, acrylonitrile / butadiene rubber type, styrene / butadiene rubber type, neoprene rubber type, polysulfide rubber type, etc. are used at room temperature. An adhesive having rubber elasticity is used.

At least two kinds of thermosetting resin adhesives used by mixing with the elastomer adhesive include phenol resin type, urea resin type, melamine resin type, polyamide resin type, alkyd resin type, epoxy resin type and polyurethane resin. A system or the like is used.

One of at least two kinds of thermosetting resin adhesives has a curing temperature of less than 100 ° C., and the other thermosetting resin adhesive has a curing temperature of 100 ° C. or more. Things are used.

For example, a melamine resin adhesive that cures at around 120 ° C. and an epoxy resin adhesive that cures at room temperature or below 100 ° C. are used as a mixture.

When the glass fiber sheet and the decorative veneer are laminated on the surface of the substrate with the elastic adhesive applied and hot-pressed, the thermosetting resin adhesive is applied by pressure to the conduit on the surface of the substrate and the back of the decorative veneer. Although it penetrates into the pores, the fine irregularities, and the structure that constitutes each of them, the temperature of the laminated body is gradually increased by mixing and using at least two kinds of thermosetting resin adhesives having different curing temperatures. As the temperature rises, the adhesive having a lower curing temperature first cures to form the initial adhesion. At this time, the adhesive having a high curing temperature is uncured, and among them, the adhesive having a low curing temperature cures in a substantially three-dimensional network shape. Then, when the temperature of the laminated body further rises,
An adhesive having a high curing temperature enters the inside of the mesh and further deeply to cure in a entangled state to form a secondary bond. Therefore, the elastic adhesive sufficiently penetrates into the decorative veneer and the surface of the substrate, and the peeling strength of the permeated portion is significantly improved.

The mixing ratio of the thermosetting resin adhesive to the elastomer adhesive is preferably 20 to 56 wt%. If the mixing ratio of the thermosetting resin adhesive is less than 20 wt%, the strength of bonding the substrate and the decorative veneer is insufficient and the decorative veneer is easily peeled off. On the other hand, if the mixing ratio of the thermosetting resin adhesive exceeds 56 wt%,
The interlaminar peel strength of the elastic adhesive tends to be higher than the peel strength of the substrate surface and the decorative veneer, and the elasticity of the adhesive becomes insufficient to absorb the movement of contraction and expansion of the decorative veneer and the substrate. Becomes difficult.

A glass fiber sheet is placed on the surface of the substrate coated with the elastic adhesive, and then a decorative veneer is placed thereon, and the whole of them is heated and pressed using a hot press machine to adhere the decorative veneer. Then, the decorative board of the present invention is obtained.

The glass fiber sheet has a basis weight of 20 to
A sheet-like material in the range of 35 g / m ² is used, and a sheet obtained by a papermaking method or the like is preferably used.

The elastic adhesive applied to the substrate is made by applying the elastic adhesive to the surface of the substrate, placing the glass fiber sheet and the decorative veneer, and heating and pressing them all together. Since it passes through the inside and leaches to the surface of the glass fiber sheet, the substrate, the glass fiber sheet and the decorative veneer can be firmly laminated and adhered by one press to be integrated.

FIG. 1 schematically shows the constitution of a decorative board of the present invention, in which a decorative veneer 4 is attached to the surface of a substrate 1 via an elastic adhesive 2 and a glass fiber sheet 3. It is a veneer.

In the decorative board of the present invention, the interlayer peel strength of the elastic adhesive layer is smaller than the interlayer peel strength of the decorative veneer itself attached to the surface and the interlayer peel strength of the substrate surface. Therefore, when the decorative veneer on the surface of the decorative plate and the substrate are pulled in an attempt to separate the layers, the layers are separated from each other in the elastic adhesive layer that adheres the both.

By providing such a peel strength relationship, even if the substrate constituting the decorative plate and the decorative veneer repeat their own contraction and expansion due to the change in water content over a long period of time, they are interposed between the two. These behaviors are absorbed by the elastic adhesive, which prevents cracking due to the difference in shrinkage and expansion between the two.

Further, the glass fiber sheet disposed in the elastic adhesive prevents the movement of contraction and expansion of the substrate on the lower surface of the sheet from being transmitted to the upper surface of the sheet. Therefore, even if a crack occurs on the surface of the substrate, it is temporarily absorbed in the elastic adhesive layer, and the movement that cannot be completely absorbed in the elastic adhesive layer is restrained by the glass fiber sheet. It is prevented that the veneer is affected.

[0027]

According to the present invention, the decorative veneer can be prevented from being cracked, and the veneer can be easily manufactured to improve the productivity and reduce the cost.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a schematic configuration of a decorative board according to the present invention.

[Explanation of symbols]

 1 substrate 2 elastic adhesive 3 glass fiber sheet 4 decorative veneer

Claims (3)

[Claims] 1. A decorative plate having a decorative veneer adhered to the surface of a substrate via an elastic adhesive and a glass fiber sheet,
The adhesive layer has a lower interlaminar peel strength than the surface decorative veneer and the substrate surface interlaminar peel strength, and the surface decorative veneer is attached so that it peels within the elastic adhesive layer. A featured decorative board. 2. The elastic adhesive used is a mixture of an elastomer adhesive and at least two kinds of thermosetting resin adhesives, and the curing temperature of one of the at least two kinds of thermosetting resin adhesives. Is less than 100 ° C., and the curing temperature of the other thermosetting resin adhesive is 100 ° C. or higher. 3. An elastic adhesive is applied to the surface of a substrate, a glass fiber sheet is placed on the surface of the substrate, and a decorative veneer is further placed on the surface of the substrate. A method for manufacturing a decorative board, which comprises wearing the same.