JP2002036368A - Wood veneer sticking method - Google Patents

Abstract

(57) [Summary] A wood substrate capable of securely adhering a wet wood veneer to a base material containing a plastic component using an emulsion-type aqueous adhesive without causing poor adhesion. Provided is a method for attaching a board. A 12 mm × 30 mm × 30 mm plastic composite wood as a base material M is formed by press-molding a woody resin composition in which 55% by weight of wood powder and 45% by weight of PP are uniformly mixed. After applying 7 g / scale ² of an EVA emulsion type water-based adhesive C having a moisture content of 72% to the surface of the substrate M, the coating was performed at 50 ° C. in an atmosphere.
Dried for minutes. Then, on the surface of the base material M obtained by drying the aqueous adhesive C, the oak veneer F in a wet state having a thickness of 0.25 mm and a water content of about 85% is superimposed, and 80 ° C., 8 kg / c
After stuck by pressure 2 min Heat m ^2, and the by directing the cold wind for two minutes to remove residual moisture in oak veneer F.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plastic material containing a plastic component such as a base material formed of a woody resin composition comprising a thermoplastic material such as polypropylene and a cellulosic material such as wood flour. The present invention relates to a method for attaching a wood veneer in which a wood veneer in a wet state is attached to a surface of a base material to be bonded.

[0002]

2. Description of the Related Art Artifacts such as floorboards are usually provided on the surface of a base material made of wood, such as plywood or medium fiberboard (MDF).
FIG. 6 (a) shows a thin wooden veneer such as a veneer veneer adhered with an ethylene-vinyl acetate copolymer (EVA) -based or acrylic emulsion-type aqueous adhesive or the like.
As shown in (a), after applying the emulsion-type aqueous adhesive C to the surface of the base material M, as shown in (b) and (c) of FIG. Manufactured by

By the way, in order to form a thin wooden veneer to be attached to a substrate, the wooden material must be sliced in a wet state, and the thin wooden veneer sliced in a wet state is dried. When sticking a wooden veneer to the surface of a substrate, it is common to apply heat and pressure on the surface of the substrate as it is, without drying the wet veneer. It is.

[0004] EVA-based or acrylic-based emulsion-type water-based adhesives used as adhesives for sticking a wooden veneer to a base material are required when the amount of water in the adhesive becomes unnecessarily large. Although it is not possible to ensure good adhesive performance, it is not suitable for bonding a high-moisture content wood veneer to a substrate as described above, but it is made of a wood material such as plywood or MDF. Since the base material has a certain level of water-absorbing performance, when hot-pressed, the water in the emulsion-type aqueous adhesive and the water in the wood veneer are easily absorbed by the base material, and the wet state Even if a wooden veneer is used, there is no particular problem such as a decrease in adhesiveness.

[0005]

However, in recent years,
Due to the high price of the wood material itself used as a base material due to the depletion of raw wood and the like, the price fluctuates greatly, and from the viewpoint of effective use of waste plastic discarded in large quantities, for example, heat from polypropylene or the like A wood-based resin composition obtained by melt-mixing a plastic material and a cellulosic material such as sander dust and wood powder in a molten state by press molding, roll (continuous) press molding, extrusion molding or the like. It is desired to use wood.

However, since a substrate containing such a plastic component has poor water absorption, it is difficult to bond a wet wood veneer having a high water content using an emulsion-type aqueous adhesive. Unlike the case where is made of wood material such as plywood or medium fiber board (MDF), the water in the water-based adhesive and the water in the wood veneer cannot transfer to the base material side. There is a problem in that the amount of water in the adhesive becomes unnecessarily high, resulting in poor adhesion.

An object of the present invention is to provide a wet wood veneer which can be reliably adhered to a substrate containing a plastic component by using an emulsion type aqueous adhesive without causing poor adhesion. An object of the present invention is to provide a method for attaching a wooden veneer.

[0008]

Means for Solving the Problems and Their Effects To solve the above-mentioned problems, the invention according to claim 1 is directed to a wooden veneer in which a wet veneer is adhered to a base material containing a plastic component. An adhesive method, wherein a step of applying an emulsion-type aqueous adhesive to the surface of the substrate, a step of drying the aqueous adhesive applied to the surface of the substrate, and the step of applying the aqueous adhesive A step of superposing the wooden veneer on the surface of the base material and heat-pressing the wooden veneer. The term “substrate containing a plastic component” as used herein refers to, for example, a substrate molded from a wood-based resin composition composed of a thermoplastic material such as polypropylene and a cellulosic material such as wood flour. This includes not only the case where a part is formed of a plastic component but also the case where the whole is formed only of a plastic component.

The above-mentioned "plastic components" include polypropylene (PP) and polystyrene (P
S), polyethylene (PE), polyethylene terephthalate (PET), acrylonitrile butadiene styrene copolymer (ABS), polyvinyl chloride (PVC), etc., and waste plastics of these or a mixture of two or more types These thermoplastic materials may contain a small amount of thermosetting plastic material.

As the emulsion type aqueous adhesive, it is desirable to use an ethylene-vinyl acetate copolymer (EVA) or acrylic adhesive having good adhesiveness to plastic components.

[0011] As described above, this method for sticking a wooden veneer involves applying a wet wooden veneer to a surface of a substrate coated with an emulsion-type aqueous adhesive, and then pressing the substrate with heat before pressing. By drying the water-based adhesive applied to the water-based adhesive, the water in the water-based adhesive is removed in advance. Move to the adhesive side,
The aqueous adhesive will reactivate. Therefore, the amount of water in the aqueous adhesive does not increase more than necessary, and poor adhesion does not occur, so that the wooden veneer is securely adhered to the surface of the base material.

Further, as in the method for sticking a wooden veneer according to claim 2, the base material is heated before the aqueous adhesive is applied to the surface of the base material. Since the evaporation of water in the aqueous adhesive applied to the material is promoted,
The drying step of the aqueous adhesive applied to the substrate can be suppressed in a short time.

Further, as in the method for attaching a wood veneer according to claim 3, before applying the emulsion-type aqueous adhesive to the surface of the substrate, the surface of the substrate and the emulsion-type adhesive are applied. If the base material is subjected to a surface treatment for improving the affinity with the aqueous adhesive, the adhesion between the wood veneer and the base material is further improved. The term “surface treatment” used herein refers to “chemical treatment (chemical treatment)” in which the surface is oxidized and etched using chemicals such as acids, alkalis, and oxidizing agents to improve the affinity with the adhesive. "Active gas treatment (physical treatment)" to improve the affinity with the adhesive by oxidizing and etching the surface with ozone, plasma, ultraviolet light, etc. or a compound with an affinity between the adhesive and the substrate And "primer treatment" for improving the adhesiveness by applying the composition to the base material.

[0014] Further, as in the method for attaching a wooden veneer according to claim 4, the wooden veneer is superposed on the base material and hot-pressed, and then the wooden veneer is exposed to wind.
If the residual moisture in the wooden veneer is allowed to evaporate and diffuse, the water content of the wooden veneer can be reduced to a fiber saturation point or less in a short time. A working material such as a floor board to which a veneer is adhered can be efficiently manufactured.

Further, as described above, when the water in the aqueous adhesive is removed in advance by drying the aqueous adhesive of the emulsion type applied to the surface of the base material, the water in the aqueous adhesive is removed. Since the adhesive strength of the water-based adhesive decreases due to the decrease in the amount, it is not possible to hold the wooden veneer on the base material only by overlaying the wooden veneer thereon. Therefore, when inserted into a press device for hot pressing, the wooden veneer superimposed on the surface of the base material is displaced or rolled up, and the wooden veneer is stuck to the base material surface neatly. A new problem arises, such as inability to perform

In order to solve such a problem, claim 5
In the method for attaching a wooden veneer according to the above, when the wooden veneer is superimposed on the surface of the base material on which the emulsion type aqueous adhesive is applied and hot-pressed, first, the wooden veneer is partially After temporary bonding to the base material by hot pressing, the wood veneer is entirely bonded to the base material by hot pressing as a whole.

As described above, when the wooden veneers superposed on the surface of the base material are temporarily bonded by partially applying heat and pressure, the base material on which the wooden veneer is superimposed is transferred to the veneer bonding line. When inserted into a press or a press device, the wooden veneer superimposed on the substrate does not shift or roll up, and the wooden veneer can be stuck to the surface of the substrate neatly. In addition, the temporarily bonded portion is reactivated by the moisture in the wood veneer and the heat and pressure applied during the final bonding, whereby the emulsion-type aqueous adhesive is reactivated.
Since a strong adhesive force is exhibited, there is also an effect that the adhesive strength is further improved. In order to temporarily adhere the wooden veneer to the surface of the base material, a heating device using electric heat such as a soldering iron or a heating device using high frequency can be used.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings and tables, but the method of attaching a wooden veneer of the present invention is not limited to these embodiments.

(Example 1) As shown in Table 1, 55% by weight of wood flour as a cellulosic material and 45% by weight of polypropylene (PP) as a thermoplastic material were used.
By throwing into a stirring blade type mixer and stirring, a woody resinous composition of gel in which wood flour and polypropylene are uniformly mixed is produced, and the woody resin composition is press-molded. 12mm x 30mm x 30m as base material
m of plastic composite wood was formed.

Next, as shown in FIG. 1, 7 g / size of an emulsion-type aqueous adhesive C of an ethylene vinyl acetate copolymer (EVA) having a water content of 72% was applied to the surface of the substrate M made of the plastic composite wood. ^{After 2} coatings, this aqueous adhesive C was dried in an atmosphere at 50 ° C. for 7 minutes.

The water-based adhesive C applied in this manner is
Is dried on the surface of the substrate M, and a wet oak veneer F having a thickness of 0.25 mm and a moisture content of about 85%
After applying the oak veneer F onto the surface of the base material M by hot-pressing at 8 ° C. and 8 kg / cm ² for 2 minutes, the substrate M to which the oak veneer F is adhered is blown at room temperature for 2 minutes. Thereby, the residual moisture in the oak veneer F adhered to the base material M was removed.

Embodiment 2 As shown in Table 1 and FIG.
A substrate made of a 12 mm × 30 mm × 30 mm plastic composite wood manufactured in the same manner as in Example 1 except that the blending amount of wood powder is 60% by weight and the blending amount of polypropylene (PP) is 40% by weight. The surface of M was coated with 100 parts by weight of an acrylic emulsion type aqueous adhesive having a moisture content of 55% and 5 parts by weight of MDI added as a cross-linking agent at a rate of 10 g / scale ^2. 50
It was dried for 10 minutes under an atmosphere of ° C.

The water-based adhesive C thus applied
Is dried on the surface of the base material M, and the oak veneer F in a wet state having a thickness of 0.25 mm and a water content of about 85% is superimposed on the base material M.
After applying the oak veneer F onto the surface of the base material M by hot-pressing at 8 ° C. and 8 kg / cm ² for 2 minutes, the substrate M to which the oak veneer F is adhered is blown at room temperature for 2 minutes. Thereby, the residual moisture in the oak veneer F adhered to the base material M was removed.

(Embodiment 3) As shown in Table 1 and FIG.
A substrate made of a 12 mm × 30 mm × 30 mm plastic composite wood manufactured in the same manner as in Example 1 except that the blending amount of wood powder is 40% by weight and the blending amount of polypropylene (PP) is 60% by weight. M, a 3% / 20% toluene solution of chlorinated polyolefin as a primer P
The shaku ^{2 was} applied and air-dried. And EVA with a moisture percentage of 72%
After applying 7 g / scale ² of the emulsion type aqueous adhesive C, the aqueous adhesive C was dried in an atmosphere of 50 ° C. for 7 minutes.

The water-based adhesive C thus applied
Is dried on the surface of the substrate M, and a wet oak veneer F having a thickness of 0.25 mm and a moisture content of about 85%
After applying the oak veneer F onto the surface of the base material M by hot-pressing at 8 ° C. and 8 kg / cm ² for 2 minutes, the substrate M to which the oak veneer F is adhered is blown at room temperature for 2 minutes. Thereby, the residual moisture in the oak veneer F adhered to the base material M was removed.

Example 4 As shown in Table 1 and FIG.
On the surface of the same base material M as used in Example 2,
100 g of an acrylic emulsion-type water-based adhesive having a moisture content of 52% and 15 parts by weight of an amine-based cross-linking agent added thereto are applied at a rate of 10 g / scale ² and then this water-based adhesive C is placed in an atmosphere at 50 ° C. Dry underneath for 10 minutes.

The water-based adhesive C thus applied
The dried oak veneer F having a thickness of 0.25 mm and a water content of about 85% is overlaid on the surface of the base material M obtained by drying
By hot pressing at 0 ° C. and 8 kg / cm ² for 2 minutes,
After the oak veneer F is attached to the surface of the base material M, the substrate M to which the oak veneer F is applied is exposed to a normal temperature air for 2 minutes, so that the oak veneer attached to the base material M is obtained. The residual moisture in F was removed.

Embodiment 5 As shown in Table 1 and FIG.
On the surface of the same base material M as used in Example 2,
10 g of 100 parts by weight of an acrylic emulsion type water-based adhesive having a moisture content of 52% added with 15 parts by weight of an amine-based crosslinking agent and 10 parts by weight of corn starch
After the application of / scale ² , this aqueous adhesive C was dried in an atmosphere at 50 ° C. for 10 minutes.

The aqueous adhesive C thus applied
Is dried on the surface of the substrate M, and a wet oak veneer F having a thickness of 0.25 mm and a moisture content of about 85%
After applying the oak veneer F onto the surface of the base material M by hot-pressing at 8 ° C. and 8 kg / cm ² for 2 minutes, the substrate M to which the oak veneer F is adhered is blown at room temperature for 2 minutes. Thereby, the residual moisture in the oak veneer F adhered to the base material M was removed.

Example 6 As shown in Table 2 and FIG.
Substrate made of 12 mm × 30 mm × 30 mm plastic composite wood manufactured in the same manner as in Example 1 except that the blending amount of wood powder is 85% by weight and the blending amount of polypropylene (PP) is 15% by weight. A mixture of 20 parts by weight of a urea resin having a resin concentration of 70% and 0.2 parts by weight of ammonium chloride in a mixture of 80 parts by weight of an EVA-based emulsion-type aqueous adhesive having a moisture content of 72% and 7 g / After the application of the scale ² , the aqueous adhesive C was dried in an atmosphere at 50 ° C. for 7 minutes.

The water-based adhesive C thus applied
Is dried on the surface of the substrate M, and a wet oak veneer F having a thickness of 0.25 mm and a moisture content of about 85%
After applying the oak veneer F onto the surface of the base material M by hot-pressing at 8 ° C. and 8 kg / cm ² for 2 minutes, the substrate M to which the oak veneer F is adhered is blown at room temperature for 2 minutes. Thereby, the residual moisture in the oak veneer F adhered to the base material M was removed.

(Example 7) As shown in Table 2 and FIG.
Before hot-pressing the oak veneer F superimposed on the surface of the base material M, the four corners of the oak veneer F are pressed pointwise by a Teflon (registered trademark) soldering iron to form an aqueous adhesive C. Was partially adhered and the oak veneer F was stuck to the substrate M in the same manner as in Example 1 except that the oak veneer F was temporarily bonded to the substrate M.

Example 8 As shown in Table 2 and FIG.
Before hot-pressing the oak veneer F superimposed on the surface of the base material M, the aqueous adhesive C at the four corners of the oak veneer F is partially melted by a handy type high frequency generator to make the oak veneer F Was adhered to the base material M in the same manner as in Example 1 except that was temporarily bonded to the base material M.

(Embodiment 9) As shown in Table 2 and FIG.
The same base material M as used in Example 1 was heated with an IR heater to raise the surface temperature to 45 ° C., and an EVA emulsion-type aqueous adhesive having a water content of 74% was used. 7g of agent C on the surface of the substrate M / scale ²
This was applied and the aqueous adhesive C was dried in an atmosphere at 50 ° C. for 4 minutes.

The aqueous adhesive C thus applied
Is dried on the surface of the substrate M, and a wet oak veneer F having a thickness of 0.25 mm and a moisture content of about 85%
After applying the oak veneer F onto the surface of the base material M by hot-pressing at 8 ° C. and 8 kg / cm ² for 2 minutes, the substrate M to which the oak veneer F is adhered is blown at room temperature for 2 minutes. Thereby, the residual moisture in the oak veneer F adhered to the base material M was removed.

Example 10 As shown in Table 2 and FIG. 4, the blending amount of wood powder was 60% by weight, and polypropylene (P
Example 1 except that the amount of P) was 40% by weight.
A substrate M made of plastic composite wood of 12 mm × 30 mm × 30 mm manufactured in the same manner as described above was heated with a steel belt type hot press to raise the surface temperature to 50 ° C. A 100% by weight of an acrylic emulsion type aqueous adhesive having a ratio of 50% to which 5 parts by weight of MDI was added as a cross-linking agent was applied to the surface of the substrate M at a rate of 10 g / scale ² and then the aqueous adhesive C
Was dried under an atmosphere of 50 ° C. for 5 minutes.

The water-based adhesive C thus applied
Is dried on the surface of the base material M, and the oak veneer F in a wet state having a thickness of 0.25 mm and a water content of about 85% is superimposed on the base material M.
After applying the oak veneer F onto the surface of the base material M by hot-pressing at 8 ° C. and 8 kg / cm ² for 2 minutes, the substrate M to which the oak veneer F is adhered is blown at room temperature for 2 minutes. Thereby, the residual moisture in the oak veneer F adhered to the base material M was removed.

Example 11 As shown in Table 3 and FIG. 5, the blending amount of wood flour was 60% by weight, and polypropylene (P
Example 1 except that the amount of P) was 40% by weight.
A substrate M made of plastic composite wood of 12 mm × 30 mm × 30 mm manufactured in the same manner as described above was heated with a steel belt-type hot press to raise the surface temperature to 50 ° C. P is a 20% toluene solution of chlorinated polyolefin on the surface of the base material.
g / scale ^{2 was} applied. Then, after applying 7 g / scale ² of an EVA emulsion type water-based adhesive C having a moisture content of 72%, the water-based adhesive C was dried in an atmosphere of 50 ° C. for 4 minutes.

The water-based adhesive C applied in this manner
Is dried on the surface of the substrate M, and a wet oak veneer F having a thickness of 0.25 mm and a moisture content of about 85%
After applying the oak veneer F onto the surface of the base material M by hot-pressing at 8 ° C. and 8 kg / cm ² for 2 minutes, the substrate M to which the oak veneer F is adhered is blown at room temperature for 2 minutes. Thereby, the residual moisture in the oak veneer F adhered to the base material M was removed.

Comparative Example 1 As shown in Table 3, Example 2
On the surface of the same substrate as used in the above, 70 parts by weight of SBR latex, 30 parts by weight of urea melamine adhesive,
A mixture of 28 parts by weight of flour, 5 parts by weight of water, and 0.2 parts by weight of ammonium chloride was well mixed at a rate of 10 g / scale ² and then a 0.25 mm-thick wet oak veneer having a water content of about 85% was prepared. The oak veneer was adhered to the surface of the substrate by overlapping and hot-pressing at 80 ° C. and 8 kg / cm ² for 2 minutes.

Comparative Example 2 As shown in Table 3, Example 2
On the surface of the same substrate as used in the above, 70 parts by weight of SBR latex, 30 parts by weight of urea melamine adhesive,
A mixture of 28 parts by weight of flour, 5 parts by weight of water, and 0.2 parts by weight of ammonium chloride was well mixed at a rate of 10 g / scale ² and then a 0.25 mm-thick wet oak veneer having a water content of about 85% was prepared. The oak veneer was adhered to the surface of the substrate by overlapping and hot-pressing at 120 ° C. and 8 kg / cm ² for 2 minutes.

[0042]

[Table 1]

[0043]

[Table 2]

[0044]

[Table 3]

Table 4 shows the adhesion performance of the oak veneer to the base material in each of the above Examples and Comparative Examples. As can be seen from Table 4, immediately after the emulsion-type aqueous adhesive was applied to the surface of the base material, immediately after the oak veneers in a wet state were overlapped and hot-pressed, Immediately after the heat and pressure, partial swelling and floatation occurred on the surface of the oak veneer, and poor adhesion was observed in the class 2 immersion test and the plane tension test. After applying the type of aqueous adhesive, before laminating the wet oak veneer and hot pressing, the aqueous adhesive is dried to remove the water in the aqueous adhesive. For No. 11, immediately after the heat and pressure, no lifting or swelling occurred on the surface of the oak veneer, and the oak veneer did not peel off from the base material even when the class 2 immersion peel test was performed. 2.0N in test mm ² or more sufficient adhesion is obtained.

In particular, in Examples 3 and 11 in which the primer was applied to the surface of the base material before applying the water-based adhesive, the adhesion was 2.3 N / mm ² in the plane tensile test, which was higher than the other examples. It can be seen that a force was obtained and the adhesiveness was improved.

Further, Examples 2, 4, 5, 8, 10 using an aqueous adhesive to which a crosslinking agent is added, and Example 6 using an aqueous adhesive to which a curing agent (ammonium chloride) is added. About 2.1 to 2.2 in a plane tensile test
A relatively high adhesive force of N / mm ² was obtained, indicating that the adhesiveness was improved.

Further, in Examples 9 to 11, in which the surface of the base material was heated before the application of the water-based adhesive, under the same conditions except that the surface of the base material was not heated, It can be understood that sufficient adhesive performance can be obtained even when the drying time of the aqueous adhesive applied to the base material surface is shorter than in Examples 1 to 3 in which the adhesive was adhered.

Further, in Examples 7 and 8 in which temporary bonding was performed by partially applying heat and pressure, the base material in which the oval veneer was laminated on the surface was turned upside down before hot pressing (final bonding). Even when the oak veneer does not fall from the base material, the oak veneer laminated on the base material does not shift or roll up when inserted into the press device, and the oak veneer is used as the base. It was able to adhere to the surface of the material neatly.

[0050]

[Table 4]

In Examples 3 and 11, the affinity between the substrate surface and the aqueous adhesive is improved by applying a 20% toluene solution of chlorinated polyolefin as a primer to the substrate surface. But
The present invention is not limited to this, and it is also possible to improve the affinity between the surface of the substrate and the aqueous adhesive by an active gas treatment such as a corona discharge treatment or a plasma discharge treatment or a chemical treatment.

In each of the above-described embodiments, the oak veneer is adhered to a base material formed of a gel-like woody resin composition in which wood flour and polypropylene are uniformly mixed. It is not limited to, the sticking method of the present invention, a substrate formed only of a plastic material,
The present invention can also be applied to a case where various wood veneers in a wet state are attached. However, if the base material contains a cellulosic material such as wood flour, the adhesiveness of the emulsion-type aqueous adhesive is improved. Therefore, the base material should contain at least 10% by weight of the cellulosic material. It is desirable.

In each of the above-described embodiments, the aqueous adhesive C applied to the surface of the base material M is forcibly dried while being heated. However, the present invention is not limited to this. It can be dried or air dried.

[Brief description of the drawings]

FIG. 1 is a process diagram showing a method for attaching a wooden veneer according to an embodiment of the present invention.

FIG. 2 is a process diagram showing a method for attaching a wooden veneer according to another embodiment.

FIG. 3 is a process chart showing a method for attaching a wooden veneer according to another embodiment.

FIG. 4 is a process diagram showing a method for attaching a wooden veneer according to another embodiment.

FIG. 5 is a process diagram showing a method for attaching a wooden veneer according to another embodiment.

FIG. 6 is a process chart showing a conventional method for attaching a wooden veneer.

[Explanation of symbols]

 M base material C water-based adhesive P primer F oak veneer

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B29L 9:00 B29L 9:00 (72) Inventor Eiji Yamano 2-10-10 Hirabayashi Minami Suminoe-ku Osaka-shi, Osaka No. 60 F-term in Eidai Industry Co., Ltd. (reference) 2B002 AA02 BA01 BB07 BB08 BB10 4F211 AA11 AD06 AG01 AG03 AR20 TA03 TC04 TH30 TN42 TN58 TW17

Claims (5)

[Claims] 1. A method for attaching a veneer veneer to a substrate containing a plastic component, the method comprising applying a water-based adhesive of an emulsion type to the surface of the substrate. And a step of drying the aqueous adhesive applied to the surface of the base material, and a step of superposing the wooden veneer on the surface of the base material to which the aqueous adhesive has been applied and hot-pressing the same. How to stick a wooden veneer. 2. The method according to claim 1, wherein the base material is heated before the aqueous adhesive is applied to the surface of the base material. 3. The method according to claim 1, wherein before applying the aqueous adhesive to the surface of the substrate, the substrate is subjected to a surface treatment for improving the affinity between the surface of the substrate and the aqueous adhesive. The method for attaching a wooden veneer according to claim 1 or 2. 4. The method according to claim 1, wherein after the wooden veneer is overlaid on the base material and hot-pressed, air is applied to the wooden veneer to evaporate residual moisture in the wooden veneer. Item 4. The method for attaching a wooden veneer according to Item 1, 2 or 3. 5. When the wooden veneer is superimposed on the surface of the base material to which the aqueous adhesive has been applied and hot-pressed, first,
The temporary bonding of the wooden veneer to the base material by partially hot-pressing the wooden veneer, and the final bonding of the wooden veneer to the base material by hot-pressing the entire wooden veneer. Or the method for attaching a wood veneer according to 4.