JPS5938891B2 - Wood veneer laminated steel plate and its manufacturing method - Google Patents

Description

Detailed Description of the Invention The present invention provides a rust-preventive synthetic resin layer containing a rust-preventive pigment on the surface of a steel plate, and further laminates a wood veneer to the steel plate via a flexible synthetic rubber water-based emulsion adhesive layer. A wood veneer laminated steel plate that has a beautiful surface condition, excellent strength and corrosion resistance, sufficient workability, and does not deteriorate even under changes in the usage environment, and a method for producing the same. It is related to.

The purpose of the present invention is to combine a steel plate, which is a noncombustible material with excellent workability and strength, with decorative wood veneers (hereinafter simply referred to as wood veneers) such as natural precious wood veneers and synthetic wood veneers. The surface appearance and texture of the wood veneer itself is similar to that of natural precious wood, and the fire resistance and strength are comparable to those of steel plates.We have developed wood veneer laminated steel plates for use in building materials and various types of equipment, and their manufacturing methods, by taking advantage of the characteristics of the painting material. It is to provide. It has been conventional practice to combine plywood and wood veneer using adhesives, and since plywood and wood veneer are made of the same wood,
The moisture content and coefficient of thermal expansion are almost the same, and problems such as cracking or peeling of warped wooden veneers due to changes in temperature, humidity, etc. rarely occur. Furthermore, since these materials absorb adhesive appropriately, there is little chance of the adhesive seeping into the surface of the wooden veneer when heated and pressurized. However, these materials have a major problem in that they are flammable and cannot be used in areas that require fire protection. Recently, however, attempts have been made to combine wood veneers with metal plates using adhesives to produce wood veneer laminated metal plates that have fire resistance, strength, and workability. However, since the materials of wood veneer laminated metal plates are different from metal plates and wood veneers, their properties such as thermal expansion rate and whether or not they swell due to moisture absorption are completely different, leading to problems such as cracking or peeling of wood veneers. . Furthermore, since the metal plate does not absorb adhesive, there is a problem in that the adhesive seeps onto the surface of the wooden veneer, impairing the surface condition. Conventional techniques for bonding wood veneers to metal plates include a method of bonding wood veneers to metal plates using a phenolic adhesive modified with polyvinyl butyral or nitrile rubber (
JP-A No. 48-28084), a method of combining a wooden veneer with a metal plate through a non-woven fabric impregnated with a urethane resin adhesive (Japanese Patent Publication No. 52-10887), a method of forming a synthetic resin layer on a metal plate and curing it. A method of combining a wood veneer with a nonwoven fabric impregnated with an adhesive (Japanese Patent Publication No. 52-5954 and a Japanese Patent Publication No. 52-28294), a method of combining a veneer with a metal plate through a hot melt adhesive. (Jikko Sho 37-2
No. 8088) and the like are publicly known.

Among these techniques, for example, in JP-A No. 48-28084, in which a wooden veneer is composited with a metal plate via a phenolic adhesive modified with polyvinyl butyral or nitrile rubber, phenolic adhesive is used. Using adhesives has the disadvantage that the adhesive becomes reddish-brown, so if the adhesive seeps through the gaps in the conduit grooves of the wood veneer, the surface condition will be very poor. This is not preferable because it requires a temperature of at least 130°C or higher, which tends to cause cracks on the surface of the wood veneer due to thermal expansion.

In the method of combining a metal plate and a wood veneer through a nonwoven fabric impregnated with urethane resin, as in Japanese Patent Publication No. 52-10887, the reason for intervening the nonwoven fabric between the metal plate and the wood veneer is that When a wood veneer is directly bonded to a metal plate using a mold urethane resin adhesive, the adhesive itself has poor flexibility and cannot absorb the difference in the material's expansion and contraction rate due to temperature changes, resulting in cracks in the wood veneer. When the wood veneer is easily bent, significant cracking occurs in the processed parts of the wood veneer, so as a means to prevent this, non-woven fabric is used as a cushion material, but the process involves impregnating the non-woven fabric with adhesive. is required, resulting in a complicated work process.

Moreover, since the obtained wood veneer laminated metal plate has a nonwoven fabric sufficiently impregnated with a urethane resin adhesive, the cushioning properties of the nonwoven fabric are lost, and it is not much different from a one that simply has an adhesive layer. On the contrary, it becomes difficult to work with, and toxic gas is generated from the nonwoven fabric during combustion, making it impossible to use it as a noncombustible material. Furthermore, when a galvanized iron plate is used as the metal plate, there is a risk that corrosion will begin at the edges of the wood veneer laminated metal plate and the wood veneer will peel off as a result. Also, Special Publication No. 52-5954 and Special Publication No. 52-2
There is a method, as in No. 8294, in which a synthetic resin layer is provided on a metal plate and a wooden veneer is composited through a nonwoven fabric impregnated with a curable adhesive.

This has the effect of buffering the difference in elongation between the wood veneer and the metal plate during bending by providing a flexible synthetic resin layer. Even in this method, the Tokuko Sho 5
Similar to the method of No. 2-10887, there are many problems due to the intervention of the nonwoven fabric, and the synthetic resin layer only improves processability and does not prevent corrosion of the metal plate. Among the conventional techniques, there are many practical problems in the method of combining a wooden veneer with a metal plate using a hot-melt adhesive, as in Japanese Utility Model Publication No. 37-28088.

That is, there are two types of hot melt adhesives: film-like adhesives and solid-like adhesives. Film-like products do not require painting equipment, and the solid content is close to 100%, so if you use a hot melt film with a uniform thickness, the adhesive will not seep out from the conduit grooves of the wood veneer during heat and pressure pressing. On the other hand, this film-like adhesive tends to generate static electricity, so it has the disadvantage that it tends to wrinkle when stacking the film on a metal plate, and it also tends to attract dust.
On the other hand, if a solid material is used, it is heated and melted into a liquid state, and an adhesive is applied to the gold surface in advance, then cooled and dried. In this case, as well as using a film adhesive, there is an advantage that the adhesive is difficult to seep out from the conduit grooves of the veneer during heat and pressure pressing, but on the other hand, when using a hot melt adhesive, Since the adhesive is heated and pressurized when it is completely dry, there is a fatal problem in that the veneer is prone to cracking during heating and pressurizing. Additionally, as the adhesive dries,
There is a problem in that the veneer and metal plate tend to shift when placed in a heating/pressure press machine, resulting in poor workability. Of course, the adhesive itself does not have corrosion resistance, so corrosion from the edges of the wood laminated metal plate cannot be prevented. The present invention solves these difficulties and provides a wood veneer laminate that has a beautiful surface, has excellent strength and corrosion resistance, has sufficient workability, and does not deteriorate even when the usage environment changes. It is a developed steel plate, and its gist is that the plate thickness is 0.
．． 2~2.01! A rust-preventing synthetic resin layer with a rust-preventing pigment added thereto has a dry film thickness of 2 to 20 μm on one or both sides of the steel plate, and a flexible synthetic resin layer has a dry film thickness of 10 to 70 μm on top of the rust-preventive synthetic resin layer. A wood veneer laminated steel plate having an adhesive layer made of a rubber emulsion type and a wood veneer layer with a thickness of 0.1 to 1.011 on top of the adhesive layer, and a steel plate with a thickness of 0.211 on one or both sides. A rust-preventing synthetic resin layer containing a rust-preventing pigment is provided with a dry film thickness of 2 to 20 μm, and a flexible synthetic rubber water-based emulsion type adhesive is formed on top of the layer to a dry film thickness of 10 to 70 μm. An adhesive layer is provided, and with the surface of the adhesive layer undried, a wooden veneer with a thickness of 0.1 to 1.0 nm is laminated on top of it, and the adhesive is kept at room temperature until it no longer bleeds onto the surface of the precious wood. Alternatively, there is a method for producing a wood veneer laminated steel sheet, which is characterized by drying it halfway by heating and then heating and pressurizing it. The present invention will be described in detail below based on examples. FIG. 1 shows a cross-sectional structure of an example of the wood veneer laminated steel plate of the present invention.

In the figure, 1 is a galvanized iron plate, 2 is a rust-preventing synthetic resin layer, 3 is an adhesive layer made of a flexible synthetic rubber water-based emulsion type adhesive,
4 is a teak wood veneer. The steel plates used in the present invention mainly serve as a noncombustible material and a reinforcing body, and are workable cold-rolled steel plates with a thickness of 0.2 to 2.0 w1t, galvanized iron plates, chrome-plated steel plates, Such as aluminized steel plate.

The surface of this steel plate should preferably be degreased in order to obtain uniform adhesive strength, and the surface should be pretreated with chemical conversion treatment such as chromic acid or phosphoric acid to improve adhesion with synthetic resin. It is recommended that Wood veneers include wood veneers with a thickness of 0.1 to 1.011, including natural wood veneers such as teak, walnut, oak, zelkova, rosewood, oak, sapele, and makore, as well as various synthetic wood veneers. used. The anti-rust synthetic resin layer applied on the steel plate has workability and has the effect of preventing corrosion from the edges of the wood veneer laminated steel plate. For example, zinc chromate, epoxy resin, polyester resin, urethane resin, etc.
Synthetic resin 1 with anti-corrosion pigments such as strontium chromate
It is added in an amount of about 2 to 30 parts to 0.00 parts to give it antirust power, and its dry film thickness is in the range of 2 to 20 microns.
Furthermore, if the color is toned to be similar to that of the wood veneers using colored pigments, it can be expected to have the effect of making the joints between the wood veneers and the gaps between the conduit grooves less noticeable. Addition amount of anti-corrosion pigment to resin 10
The reason why 2 to 30 parts is preferable compared to 0 parts is that if it is less than 2 parts, hardly any rust prevention effect such as making the steel plate passivated or making the synthetic resin layer impermeable to prevent water permeation can be expected.
Moreover, if the amount exceeds 30 parts, the antirust effect will not improve, but rather the synthetic resin layer will tend to lack flexibility, which will have an adverse effect on processing performance. The dry film thickness range of the anti-rust synthetic resin layer is 2~
The reason why the value is 20μ is that if it is less than 2μ, the anti-corrosion synthetic resin layer will hardly have any effect on the flexibility and corrosion resistance, and if it exceeds 20μ, no significant improvement in corrosion resistance can be expected, and if anything, it will lead to an increase in cost. It is meaningless to provide a rust-preventing synthetic resin layer.

In selecting the type of adhesive constituting the adhesive layer in the present invention, the inventors investigated various adhesives and found that a highly flexible synthetic rubber water-based emulsion type adhesive was the most suitable. We have obtained the knowledge that The flexible synthetic rubber-based adhesive used in the present invention differs from general rubber-based solvent-based adhesives in that it is made of a polymer mainly composed of styrene-butadiene rubber, chloroprene rubber, or nitrile rubber dispersed in water. When heated and dried, this adhesive hardens with a slight crosslinking reaction, making it completely insoluble in water and having excellent flexibility and solvent resistance.

Also, this adhesive has the property of becoming colorless and transparent after drying, so if the anti-corrosion synthetic resin layer is colored in a similar color to the wood veneer, the conduit grooves of the wood veneer will be able to flow through the pipe grooves without being blocked by the adhesive layer. Another advantage is that the color of the antirust synthetic resin layer can be seen through the gaps, and a wood veneer laminated steel plate with a beautiful surface can be obtained without damaging the aesthetic appearance of the wood veneer. This adhesive is weakly pressure sensitive and has a long open time, and this property can be used to prevent the adhesive from seeping out from the gaps between the veneers during heat and pressure pressing. .

The method is to apply this flexible synthetic rubber water-based emulsion type adhesive to a steel plate with a rust-preventing synthetic resin layer, and then, while the surface of the adhesive layer is still wet, place a wooden veneer on top of it and apply a light pressure. Leave it to adhere for at least 5 minutes at room temperature, or
By heating the adhesive to a temperature of 0 to 70°C for 0.5 minutes or more to make it semi-transparent and semi-dry, so that the adhesive no longer oozes onto the surface of the wood veneer, heat and pressure press is applied. A beautiful surface condition with no adhesive oozing is obtained. The reason why the appropriate thickness range for this adhesive layer is 10 to 70 .mu.m is because if it is less than 10 .mu.m, the adhesive strength may vary, so its performance cannot be expected to be very good. Also, 70
If μ is exceeded, it is not expected that the adhesive strength will improve much, and if the adhesive layer becomes too thick, the adhesive may seep into the surface of the wooden veneer.To prevent this, measures such as reducing the press pressure are required. This makes it difficult to obtain sufficient adhesion. Heating for adhesion
Pressure pressing conditions include a temperature range of 90 to 110°C that does not cause discoloration or cracking of the wood veneer, and a pressure that does not cause cracks in the wood veneer and provides sufficient adhesive strength. 3.0~
The recommended compression time is 1.0 to 3.0 minutes, which is necessary for the adhesive to dry.

The resulting wood veneer laminated steel plate has a beautiful surface condition, and since a highly flexible synthetic rubber water-based emulsion type adhesive is used, there is no difference in expansion and contraction rate due to temperature changes between the steel plate and the wood. It can buffer differences in elongation during bending and bending, and it also has excellent corrosion resistance because it has a rust-preventing synthetic resin layer. Specific examples of the present invention will be described below along with comparative examples.

Example 1 After degreasing the surface of a galvanized iron plate with a thickness of 0.3 mm, it was treated with chromic acid, and 20 parts of strontium chromate was added to 100 parts of resin, and the color was adjusted to match the color tone of the oak veneer. Apply colored epoxy resin liquid to a dry film thickness of 3μ. Then, a rust-preventing synthetic resin layer was provided by heating and curing.

A water-based emulsion type adhesive based on styrene-butadiene synthetic rubber was applied onto this rust-preventing synthetic resin layer to a dry film thickness of 15 μm, resulting in a plate thickness of 0.2 m1! L oak wood veneers were overlapped and lightly pressure-sensitive adhesively bonded, left at room temperature for 5.0 minutes, and then heated and pressed at 90℃ using a heating/pressure press at 3.0kg/(17cm).
A wood veneer laminated steel plate was obtained by heating and pressurizing for 3.0 minutes under the conditions of 7i. The structure, manufacturing conditions, characteristics, etc. are summarized in Tables 1 and 2. Example 2 After degreasing the surface of a chrome-plated steel plate with a thickness of 0.5 mTn, chromic acid treatment was performed, and 20 parts of zinc chromate was added to 100 parts of resin, and the color was adjusted to match the color tone of the oak veneer. A colored Ureta 7 resin liquid was applied to a dry film thickness of 15 μm and cured by heating to provide a rust-preventing synthetic resin layer.

A styrene-butadiene synthetic rubber-based aqueous emulsion adhesive was applied onto this rust-preventing synthetic resin layer to a dry film thickness of 40μ, resulting in a plate thickness of 0.2W! M oak veneers were stacked together and lightly pressure-sensitive adhesive bonded, and left at room temperature for 60 minutes.
100℃, 5.0kg/c with heating pressure press machine! A wood veneer laminated steel plate was obtained by heating and pressurizing for 2.0 minutes under the conditions of 1. The structure, manufacturing conditions, characteristics, etc. are summarized in Tables 1 and 2. Example 3 Plate thickness 1.2mm
After degreasing the surface of the aluminized steel plate, the surface was treated with chromic acid, and then 3 parts of strontium chromate was added to 100 parts of the resin, and a polyester resin liquid whose color was adjusted to match the color of the teak veneer was dried into a film. It was coated to a thickness of 12 μm and cured by heating to provide a rust-preventing synthetic resin layer.

A water-based emulsion type adhesive based on chloroprene synthetic rubber is applied onto this rust-preventing synthetic resin layer to a dry film thickness of 50 μm, and a teak wood veneer with a thickness of 0.3 mm is layered and lightly pressure-sensitive adhesive bonded. After being left at room temperature for 180 minutes, it was heated to 110°C with a heating/pressure press at 7.0 kg/C1? A wood veneer laminated steel plate was obtained by heating and pressurizing under the conditions of L. Its structure, manufacturing conditions, characteristics, etc. are summarized in Tables 1 and 2.
Shown in the table. Example 4 Plate thickness 0.8m7! After degreasing the surface of the L galvanized iron plate, it was treated with phosphoric acid, and 15 parts of strontium chromate was added to 100 parts of the resin, and an epoxy resin liquid whose color was adjusted to match the color of the walnut veneer was dried into a film. It was coated to a thickness of 8 μm and cured by heating to provide a rust-preventing synthetic resin layer.

A chloroprene synthetic rubber water-based emulsion type adhesive layer was applied on top of this rust-preventing synthetic resin layer to a dry film thickness of 70 μm, and a 0.41 m1 thick walnut veneer was layered and lightly pressure-sensitive adhesive bonded. After heating at 40° C. for 2.0 minutes, a wood veneer laminated steel plate was obtained by heating and pressurizing for 2.0 minutes at 100° C. and 8.0 kg/d using a heating press machine. The structure, manufacturing conditions, characteristics, etc. are summarized in Tables 1 and 2. Example 5 After degreasing the surface of a cold-rolled steel plate with a thickness of 1.6 mm, it was treated with phosphoric acid, and 5 parts of zinc chromate was added to 100 parts of resin, and the color was adjusted to match the color tone of the rosewood veneer. Apply a toned polyester resin liquid to a dry film thickness of 20μ,
A rust-preventing synthetic resin layer was provided by heating and curing.

A nitrile synthetic rubber water-based emulsion type adhesive was applied onto this rust-preventing synthetic resin layer to a dry film thickness of 30μ, resulting in a plate thickness of 0.31! I! After stacking rosewood veneers and lightly bonding them with pressure sensitive adhesive, and heating them at 70℃ for 0.5 minutes, they were heated to 110℃ using a heating pressure press and 10.0kg/(1-J model).
A wood veneer laminated steel plate was obtained by heating and pressurizing for 1.0 minutes under the conditions of V1. The structure, manufacturing conditions, characteristics, etc. are summarized in Tables 1 and 2. Comparative Example 1 After degreasing the surface of a cold-rolled steel plate (thickness 0.31 & 1L0), a nitrile synthetic rubber water-based emulsion type adhesive was applied thereon to a dry film thickness of 40μ without surface treatment. , board thickness 0.2UI! Oak wood veneers were stacked and lightly pressure-sensitive adhesive bonded, left at room temperature for 5.0 minutes, and then heated and pressed in a heating press at 90℃ and 3.0k9/d.
A wood veneer laminated steel plate was obtained by heating and pressurizing for minutes.

The structure, manufacturing conditions, characteristics, etc. are summarized in Tables 1 and 2. Comparative example 2 plate thickness 0.5! ! ]! After degreasing the surface of the galvanized iron plate, it is treated with chromic acid, and then treated with 100% resin.
adding 5 parts of strontium chromate per part,
A polyester resin liquid adjusted to match the color tone of the zelkova wood veneer was coated to a dry film thickness of 20 μm, and heated and cured to provide a rust-preventing synthetic resin layer.

A water-based emulsion type adhesive based on chloroprene synthetic rubber is applied onto this anti-rust synthetic resin layer to a dry film thickness of 60 μm, and a 0.2-thick zelkova wood veneer is layered and lightly pressure-sensitive adhesive bonded. Immediately heat and press at 100°C.
A wood veneer laminated steel plate was obtained by heating and pressurizing for 2.0 minutes under the conditions of 0 kg/(i). Its structure, manufacturing conditions, characteristics, etc. are summarized in Tables 1 and 2. Comparative Example 3 After degreasing the surface of a cold-rolled steel plate with a thickness of 1.2 nm, the surface was treated with phosphoric acid, and a urethane resin liquid was mixed to match the color tone of the walnut veneer without adding anti-corrosion pigments to a dry film thickness of 1.
It was coated to a thickness of 5 μm and cured by heating to provide a synthetic resin layer.

A water-based emulsion adhesive based on styrene-butadiene synthetic rubber was applied onto this synthetic resin layer to a dry film thickness of 5 μm, and a walnut veneer with a thickness of 0.3 m and 11 L was overlaid and lightly pressure-sensitive adhesive bonded. After leaving it at room temperature for 30 minutes, it was heated at 100℃ using a heating press machine, and 5.0kg/(1-J
A wood veneer laminated steel plate was obtained by heating and pressurizing for 2.0 minutes under the conditions of MoV1.The structure, manufacturing conditions, characteristics, etc. are summarized in Tables 1 and 2. Comparative Example 4 After degreasing the surface of a chrome-plated steel plate with a thickness of 0.5 wg, chromic acid treatment was applied, and 10 parts of zinc chromate was added to 100 parts of resin, and the color was adjusted to match the color tone of the oak veneer. A colored epoxy resin liquid was applied to a dry film thickness of 5 μm and cured by heating to provide a rust-preventing synthetic resin layer.

A water-based emulsion type adhesive based on styrene-butadiene synthetic rubber is applied onto this rust-preventing synthetic resin layer to a dry film thickness of 120 μm, and a 0.2 mm thick oak wood veneer is overlapped with a light pressure-sensitive adhesive. After heating at 50°C for 1.0 minutes,
A wood veneer laminated steel plate was obtained by heating and pressurizing for 2.0 minutes at 110° C. and 10.0 k9/Cll using a heating press machine. The structure, manufacturing conditions, characteristics, etc. are summarized in Tables 1 and 2. Comparative example 5 Plate thickness 0.5U7! After degreasing the surface of the galvanized iron plate, we applied an epoxy resin adhesive to a dry film thickness of 30μ without surface treatment, and stacked oak veneer with a thickness of 0.4mm to give a light feel. 11. Pressure bonded and heat pressure press machine.
A wood veneer laminated steel plate was obtained by heating and pressurizing for 3.0 minutes at 0°C and 3.0k9/d.

The structure, manufacturing conditions, characteristics, etc. are summarized in Tables 1 and 2. Comparative example 6 Plate thickness 0.3m7! After degreasing the surface of the cold-rolled steel sheet of No. t, it was treated with phosphoric acid, and a thermoplastic Nylo 7 adhesive film with a thickness of 40μ was overlaid on this surface treatment layer, and a sheet with a thickness of 0.3m was placed on top of this.
Layered zelkova wood veneers of 500mm thick and heated to 110℃ using a heating and pressure press machine.
, 7.0 kg/(heated for 1.0 minutes under the conditions of 1-JMoV1)
By applying pressure, a wood veneer laminated steel plate was obtained.

The structure, manufacturing conditions, characteristics, etc. are summarized in Tables 1 and 2. Comparative example 7 Plate thickness 0.8m77! After degreasing the surface of the aluminized steel sheet, the surface is treated with phosphoric acid, and then 20 parts of strontium chromate is added to 100 parts of the resin, and an epoxy resin liquid whose color is adjusted to match the color of the oak veneer is applied to a dry film thickness. It was coated to a thickness of 3 μm and cured by heating to form a rust-preventing synthetic resin layer.

A chloroprene rubber-based solvent-based adhesive is applied to this rust-preventing synthetic resin layer to a dry film thickness of 120μ, and a nonwoven fabric made of acrylic fibers with a thickness of 0.1 mI is layered on top of this. A wood veneer laminated steel plate was obtained by stacking 0.3V1L oak veneers and heating and pressurizing them for 3.0 minutes at 100° C. and 4.0 kg/d using a heating press machine. Table 1 summarizes its structure, manufacturing conditions, characteristics, etc.
It is shown in Table 2. Comparative example 8 Plate thickness 1.0U! After degreasing the surface of the cold-rolled steel sheet, the surface was treated with phosphoric acid, and a polyester resin liquid toned to match the color of the oak veneer was applied to a dry film thickness of 2.
A synthetic resin layer was formed by applying the resin to a thickness of 0μ and curing it by heating.

A urethane resin adhesive was applied on top of this synthetic resin layer to a dry film thickness of 60μ, resulting in a thickness of 0.0511! Layer high-quality paper, layer oak veneer with a board thickness of 0.211 on top, and heat and press at 100℃ and 7.01<g/d.
A wood veneer laminated steel plate was obtained by heating and pressurizing for 1.0 minutes under the following conditions. The structure, manufacturing conditions, characteristics, etc. are summarized in Tables 1 and 2. Test conditions 1. Surface condition Judging the quality of the surface condition based on cracks in the wood veneer, presence or absence of adhesive seeping onto the surface of the wood veneer, and see-through of the base material through gaps in the conduit grooves of the wood veneer.

2. Planar tensile test Measure the maximum load at the time of tensile peeling or destruction of the wood veneer at a speed of 2 W1 t/min in the direction perpendicular to the adhesive surface.

3.2 Type Immersion Peeling Test After immersing in warm water at 70°C for 2 hours, drying at 60°C for 3 hours.

Determining the presence or absence of peeling of wooden veneers and conducting a plane tensile test. 4. Cold and heat repeated test The process of leaving the sample in a constant temperature machine at 80°C for 2 hours and then leaving it in a constant temperature machine at -20°C for 2 hours was repeated twice until it reached room temperature.

Determining the presence or absence of cracks in wood veneers and conducting plane tension tests. 5. 30% during the test under the conditions of humidity tester internal temperature 38℃ and humidity 100%.
After conducting the 0-hour test, the sample is left at room temperature for 24 hours.

Determine the presence or absence of peeling of the wooden veneer and the presence or absence of rust from the edges of the test piece, and conduct a plane tensile test. 6. Salt water spray test After conducting the test for 150 hours in a test machine with an internal temperature of 35°C and spraying 5% salt water, the test was carried out for 2 hours after washing with water and at room temperature.
Leave it for 4 hours.

Determine the presence or absence of peeling of the wooden veneer and the presence or absence of rust from the edges of the test piece, and conduct a plane tensile test. 7. Accelerated weathering test: After exposing to mercury lamp for 48 hours, it was left in a dark room for 72 hours.

Observe the discoloration of the wood veneer surface. 8. Solvent Resistance Test After being immersed in Lutzker thinner for 3.0 minutes, it was dried in a constant temperature oven at 60°C for 2 hours.

Determine whether the wooden veneer is peeling. 9. Bending test Perform 90 degree 2R processing in the fiber direction.

Claims (1)

[Scope of Claims] 1. A steel plate having a thickness of 0.2 to 2.0 mm and having a rust-preventing synthetic resin layer containing a rust-preventing pigment on one or both sides of the dry film thickness in the range of 2 to 20 μm. Dry film thickness on top is 10-70
It has an adhesive layer made of a flexible synthetic rubber water-based emulsion adhesive in the range of μ, and on top
A wood veneer laminated steel plate with a wood veneer layer of mm. 2. A rust-preventing synthetic resin layer containing a rust-preventing pigment is provided on one or both sides of a steel plate with a thickness of 0.2-2.0 mm with a dry film thickness of 2-20 μm, and on top of that a rust-preventing synthetic resin layer with a dry film thickness of 10-20 μm is provided. 70μ
An adhesive layer made of a flexible synthetic rubber water-based emulsion type adhesive is provided within the range of A method for manufacturing a wood veneer laminated steel plate, which comprises laminating the wood veneer, drying it halfway at room temperature or by heating until the adhesive no longer oozes out on the surface of the wood veneer, and then heating and pressurizing it.