JP2597782B2 - Veneered veneer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a veneered veneer and, more particularly, to a veneered veneer using softwood as a base material or as a surface layer of a base material.

[0002]

2. Description of the Related Art A decorative panel in which a decorative veneer so-called veneer is adhered to the surface of a wooden substrate is well known. Wood base materials include wood veneers, core boards in which wood strips are arranged and joined, various plywood, particle boards, and MDF
(Medium fiber board) or the like is used. The wood substrate affects the overall strength and surface characteristics of the decorative board itself, and those having sufficient hardness and surface smoothness have been selected and conventionally used.

[0003]

However, softwoods generally have lower compressive and shear strengths than other tree species,
Because the surface is soft, it is not necessarily a suitable material as a wood substrate for decorative boards.In addition, a single veneer is used as it is as a base material, or a material attached as a surface material such as plywood as a base material Even when the veneer is used, if the veneer is adhered to the surface, the surface of the substrate itself is soft, so that the surface of the veneer tends to be dented or scratched, and the veneer itself is disadvantageously cracked.

An object of the present invention is to solve the above-mentioned disadvantages when softwood is used as a base material of a decorative board, and more specifically, a decorative board using softwood as a base material. It is an object of the present invention to obtain a decorative board with improved surface properties.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems and to achieve the object, the present invention provides a method of applying a paper material to a surface of a base material having at least a surface layer of a softwood material through a multi-layer adhesive. Disclosed is a decorative board formed by attaching a veneer to an upper layer of the veneer via an adhesive. It is a preferable embodiment to use a paper material impregnated with a resin as the paper material,
It is possible to prevent the occurrence of inter-paper peeling and to increase the surface hardness of the base material, which is generally a softwood having a soft surface.

It is also a preferred embodiment to add a substance having good reactivity with an isocyanate group to the adhesive for attaching the paper material, and to use an adhesive having an isocyanate group for the adhesive for attaching the veneer. Thereby, it is possible to further increase the bonding strength between the members. Hereinafter, the present invention will be described in more detail.

As the softwood used as a base material, any desired material such as radiata pine and rice hemlock can be used to attain the intended purpose. Can be used without. Such softwood may be used as a substrate in the form of a veneer or in the form of a core in which strips are joined side by side, or in the form of a veneer of suitable material or a thin veneer on the surface of an MDF. It may be used as a substrate in a state of being stuck. Also,
It is also possible to use, as a substrate, a material obtained by sticking a thin leaf veneer of softwood to a surface of an appropriate foam.

[0008] The paper material to be adhered to the surface of the base material is a paper material usually used in decorative boards, in addition to ordinary thin paper.
Kraft paper, titanium paper, linter paper and the like can be used as appropriate, but kraft paper is particularly preferred. Further, in order to promote the penetration of the adhesive, no-size or low-size paper is preferable. In the present invention, by impregnating the above-described paper material with a thermosetting or thermoplastic resin, it is possible to reliably prevent the occurrence of inter-paper separation and to increase the surface hardness. It is possible to achieve the purpose. As a resin to be impregnated, a phenol resin, a melamine resin, an acrylic resin or the like can be used, and a phenol resin is particularly preferable. For these resins, if necessary, curing accelerators, solvents,
A penetrant may be added and used.

[0009] The impregnation rate of these resins is as follows.
Is preferably 40% to 70%, and particularly preferably about 50%. The above resin-impregnated paper is attached to a base material using an appropriate adhesive. There is no particular limitation on the adhesive,
The use of a thermosetting resin adhesive such as a urea resin or a melamine resin is particularly preferable because it can be expected to improve productivity and reduce cost because of quick curing and good workability.

[0010] The surface hardness of the paper material can be further increased by attaching a plurality of layers. In that case, the resin-impregnated paper material already laminated on the base material was temporarily bonded by cold pressing or the like, and then an adhesive, preferably the same thermosetting resin adhesive, was applied, and then the resin-impregnated paper material was applied again. Put on.
Hereinafter, the required number of sheets are similarly laminated. After the required number of resin-impregnated paper materials are temporarily bonded to the base material, the whole is integrated by hot pressing. Thereafter, an appropriate adhesive is applied to the uppermost surface, a veneer is adhered, and the two are integrated by hot-sealing again by hot pressing to obtain a final product. Although there is no particular limitation on the adhesive used for attaching the veneer, aqueous vinyl urethane, a thermosetting resin adhesive such as urea melamine, vinyl acetate, a thermoplastic resin adhesive such as modified vinyl acetate,
Alternatively, a mixture thereof can be used, and in particular, aqueous vinyl urethane is preferable.

[0011] To the adhesive used for attaching paper, a substance having a good reactivity with isocyanate groups, such as polyethylene glycol, ethylene glycol, propylene glycol, and glycerin, is added in an amount of 1 to 25%. The use of an adhesive having an isocyanate group such as aqueous vinyl urethane and crude MDI as the adhesive used for the adhesion, since mutual adhesion is further improved,
This is a particularly preferred embodiment. In particular, when urea resin is used as an adhesive for bonding paper and polyethylene glycol is added thereto, the polyethylene glycol bleeds to the surface and cures with an adhesive used for bonding the veneer, such as aqueous vinyl urethane. Becomes easier.

[0012]

The present invention will be described below with reference to examples.

[0013]

[0014]

[0015]

Example 1 Glycerin was added to 12 m / m softwood plywood.
Parts, 1 part of crude MDI, 110 g / m ^{2 of} urea melamine resin adhesive added, kraft paper impregnated with phenol resin of 60 g / m ² was stuck, and temporarily pressed with a cold press at 5 kg / cm ² for 20 minutes. After bonding, the plate was opened.

On top of this, apply the same adhesive again,
After applying the same impregnated paper and cold pressing similarly, 12
Hot pressing was performed at 5 ° C. and 10 kg / cm ² for 3 minutes. Using this base material, aqueous vinyl urethane was applied to the surface at 90 g / m ² , a 0.3 m / m thick veneer was applied, and 110 ° C., 7 kg / c
m ² , hot pressed for 1 minute to obtain a decorative board.

[0017]

[Comparative Example] Aqueous vinyl urethane was applied to the surface of 12 m / m softwood plywood at 90 g / m ² , a 0.3 m / m oak veneer was applied, and hot pressed at 110 ° C. and 7 kg / cm ² for 1 minute. A decorative plate was obtained.

[0018]

[Comparison] When the casters with a load of 20 kg were repeatedly rolled on the surfaces of the decorative panel of Example 1 and the decorative panel of the comparative example, the decorative panel of Example 1 was rotated 100,000 times. Although no particular change occurred on the surface, in the decorative plate of the comparative example, a dent was formed on the surface by repeated rolling about 10,000 times, and a crack was generated on the veneer by repeated repeated rolling.

As is clear from the above test results,
It can be seen that the decorative board according to the present invention has better surface characteristics than the conventional decorative board (comparative example).

[0020]

According to the present invention, it is possible to obtain a decorative board having a flat surface and a high surface hardness, while being a veneer-attached decorative board using softwood as a base material.

Claims (2)

(57) [Claims] 1. A paper material impregnated with a resin is adhered to the surface of a base material having at least a surface layer of softwood material via a multi-layer adhesive, and a veneer is adhered to the upper layer via an adhesive. A decorative board. 2. An adhesive for attaching a paper material to which an isocyanate group-reactive substance is added, and an adhesive having an isocyanate group is used for an adhesive for attaching a veneer. The decorative board according to claim 1.