JP2997393B2 - Method of manufacturing reinforced wood 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 floor material, especially a wear-resistant, durable, and decorative material suitable for floor materials of shops and public facilities where there is a lot of traffic and the footwear is used for walking and the use environment is severe. The present invention relates to a method for producing an excellent reinforced wood decorative board.

[0002]

2. Description of the Related Art Conventionally, a composite veneer made of wood and plastic has been manufactured by injecting a processing liquid such as a synthetic resin solution or a monomer liquid into a wooden veneer and then curing the processing liquid in the veneer. The method of doing so is widely known. And, since such a composite veneer is made of a composite of wood and plastic, it has excellent durability such as abrasion resistance, water resistance and stain resistance as compared with the original wooden veneer, and is mainly used for entrances of houses. Is used for flooring such as floors, corridors, and decks, but in order to adopt it as a flooring to be laid in places where traffic is intense, such as stores, schools, public halls, and other public facilities, higher resistance is required. Durability such as abrasion, water resistance and stain resistance is required.

For this reason, the durability is increased by impregnating and hardening a large amount of a resin solution such as a synthetic resin solution or a monomer solution into a wooden veneer. In order to achieve high impregnation, the injection conditions of resin injection by the decompression / pressurization method are strict, and the resin liquid with high impregnation is used. In the latter case, the production efficiency deteriorates, and in the latter case, a large amount of a solvent or a monomer is added to use a resin solution having an increased impregnation property. As a result, the resin solution is polymerized and hardened in a wooden veneer. In this case, there is a possibility that irregularities and cracks may be generated on the surface of the veneer, particularly at the portion of the veneer veneer having a large impregnation amount.

Accordingly, for example, Japanese Patent Application Laid-Open No. 55-69402
As described in Japanese Unexamined Patent Application Publication No. 60-46204 or Japanese Patent Application Laid-Open No. 60-46204, an external force such as a press is applied to wood to cause many cracks and damages on the cell walls of the wood cells. How to inject wood efficiently,
As described in JP-A-1-182002, a method has been proposed in which a wooden veneer is impregnated with a hydrophilic resin liquid, and then heated and pressed to be cured simultaneously with compression.

[0005]

However, according to the former method in which cracks or damages are caused to the cell walls of wood to improve the impregnation of the resin liquid, the impregnation and hardening of a large amount of the resin liquid are required. It is effective to improve physical properties such as abrasion and water resistance, but in the case of low specific gravity wood, the amount of resin liquid to be impregnated is increased more than necessary, and the resulting reinforced wood decorative board becomes expensive In addition, there is a problem that the decorativeness is deteriorated due to the appearance of plastic as a whole.

The decorative property can be improved by using a hardwood material having a good decorative property and a high specific gravity. However, a hardwood timber veneer having a high specific gravity suitable for flooring as described above is expensive. In addition, it takes many months to grow and is difficult to obtain. Therefore, by combining wood veneers and plastics that are easy to obtain, such as cedar wood and hinoki wood (including thinned wood), which are easy to plant and grow, they combine high durability with excellent decorativeness. Although there is a demand for a decorative wooden board, the above method cannot provide such a reinforced wooden decorative board as described above.

Furthermore, in the above method, since only external force is applied to the wood by pressing or rolling, even if cracks can be generated in the cell walls of the wood cells or the wood can be damaged, the wood can be densified. It is difficult, and if you try to forcibly densify the wood by external force, the wood will be severely damaged such as tearing, and the strength of the wood itself will decrease significantly,
In the end, the wood must be impregnated with a large amount of resin liquid to improve the wear resistance.

On the other hand, according to the latter method, a wooden veneer is impregnated with a hydrophilic resin solution, and the resin solution is cured by heating and pressurizing it in a wet state. Thereafter, since the wooden veneer is compressed and densified, there is a disadvantage that a large amount of the resin liquid impregnated in the wooden veneer is squeezed out of the material with the compression, resulting in a loss. In addition, since the resin liquid in the material is hardened while being compressed by hot pressure, it cannot be repaired if cracks or dents in the early wood portion occur in the wooden veneer due to compression under hot pressure. However, there is a problem that a weakened portion that is not impregnated and hardened occurs. In particular, when a low specific gravity material is used as a wooden veneer, such a defective portion is easily generated.

[0009] The present invention has been made in view of the above problems, and despite the fact that it is easily available, it has been used in this type of application, that is, a low-priced material that has hardly been used as a flooring material. Provided is a method for manufacturing a reinforced wood decorative board which can be used as a flooring material in a place where the use environment is severe such as a store, even if it is a softwood veneer having a specific gravity, and which can provide excellent durability and excellent decorativeness. It is intended for.

[0010]

In order to achieve the above object, a method for producing a reinforced wood decorative board according to the present invention comprises heating a wooden veneer by a flat plate press and applying a pressure of 3/4 to 1/4 of the original veneer thickness. Compressed to a thickness of / 4, then impregnated with a non-hydrophilic polymerizable and curable resin liquid into the compressed veneer, and then polymerized and cured in the compressed veneer. It is assumed that.

In the above method, the invention according to claim 2 is characterized in that the wood veneer is a softwood veneer veneer having an air-dry specific gravity of 0.3 to 0.6. In the invention, the thickness of the softwood veneer is 1 to 8 mm, and the softwood veneer is veneered at a temperature of 100 to 180.degree.
It is characterized by being formed into a compressed veneer by heating and pressing under conditions of f / cm ^{2 to} 100 kgf / cm ² .

[0012]

Before the wooden veneer is impregnated with the polymerizable curable resin liquid, the wooden veneer is heated and pressed by a flat plate press. Therefore, the wooden veneer is plasticized by heating, and the wooden veneer is not significantly damaged. It is compressed by pressure to 3/4 to 1/4 of its original thickness, and deformation such as warpage and torsion is prevented by the flat plate press. Strength is improved.

Next, the compressed veneer is impregnated with a non-hydrophilic polymerizable and curable resin liquid. Since the resin liquid is non-hydrophilic, the wood veneer is impregnated with a hydrophilic resin liquid. No significant swelling such as trying to return to the original veneer thickness due to absorption of a large amount of hydrophilic solvent such as water in the resin due to affinity with the hydrophilic group contained in the wood component does not occur, and the resin is compressed. The liquid impregnation reduces the amount of the resin liquid impregnated.

Since the non-hydrophilic polymerizable resin liquid impregnated in the compressed veneer is cured in the veneer, it does not require a strong pressure to make it even more dense during polymerization curing. Further, a reinforced wood decorative board excellent in decorativeness and durability free from defects that cannot be repaired, such as cracks and depressions, is obtained.

Further, as described in claim 2, by adopting a veneer having an air-dry specific gravity of 0.3 to 0.6 as a wooden veneer, the compression strength decreases when heated and pressed by the flat plate press. Thus, the wooden veneer can be compressed more favorably to 3/4 to 1/4 of its original thickness without causing significant damage, cracks or the like.

In addition, a softwood veneer is used as a wood veneer, which has a low specific gravity as compared with a hardwood veneer and has a clear grain, so that it is economically easily available. Therefore, since the early wood part and the late wood part are the veneer veneers that are alternately present in layers in the thickness direction, veneer compression by the hot pressure in the thickness direction is performed uniformly and easily, and breakage or damage may occur. Surface irregularities are unlikely to occur. Further, as described in claim 3, by adopting the invention described in claim 1 and claim 2, a softwood veneer veneer having a thickness of 1 to 8 mm is applied at a temperature of 100 to 180 ° C. at 10 kgf / cm. by heating and pressing under the conditions of ^{2 ~100Kgf} / cm ^2, a compression veneer that has been and densified have strength such as abrasion resistance of the veneer itself to efficiently formed, non-hydrophilic in this compressed veneer Impregnated and hardened with a polymerizable and curable resin liquid to produce reinforced wood decorative boards with excellent abrasion resistance, durability and decorativeness suitable for flooring in shops and public facilities where the usage environment is severe, with high productivity You can do it.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the embodiment of the present invention will be described in detail. First, a wooden veneer is heated and pressed by a flat plate press to compress it to a thickness of 3/4 to 1/4 of the original veneer thickness. At the time of heating and pressing, the wooden veneer is plasticized by heating,
It is compressed to a thickness of 3/4 to 1/4 of its original thickness without causing significant damage, and deformation such as warpage and twisting is prevented by a flat plate press. The strength such as the property is improved.

As the wood veneer, specifically, a softwood veneer which is easily available even with a lower specific gravity than that of a hardwood veneer is used. Such conifer veneers include cedar, spruce pine, fir, fir, cypress, mouse, radiata pine,
There are Himekomatsu, spruce, etc., and the tree species is not limited,
It is desirable to use veneers such as cedar and radiata pine with clear wood grain in the early wood part and late wood part.

Further, in such softwood veneers having an air-dry specific gravity of less than 0.3, the strength against compression is weak, and when heated and pressed by a flat plate press, significant damage or cracks which cannot be repaired may occur. Also, if the air-dry specific gravity exceeds 0.6, the compressive strength increases and excessive compression may result in damage to the material, such as tearing, which may be difficult to repair, so a single plate with a low specific gravity of 0.3 to 0.6 Is preferably
Those having a low specific gravity of 0.35 to 0.45 are most preferable because they can be compressed more favorably to a thickness of 3/4 to 1/4.

Further, it is desirable to use coniferous veneers instead of straight-grained veneers. What is necessary is that a softwood veneer veneer has a curved or diagonal, horizontal early wood part and a late wood part that are alternately layered in the thickness direction, so that it is easy to hot-press in the thickness direction. In addition, since the wood fiber is in a state in which the high-density late wood portion is interposed between the low-density early wood portions that are easily compressed, unevenness and breakage hardly occur even when compressed in the thickness direction, In the case of straight-grain veneers, the early wood part and the late wood part have a structure that passes vertically between the front and back surfaces of the veneer, so the hot wood part is compressed more than the late wood part by heat and pressure treatment. In the veneer surface, not only the early wood part becomes concave and the late wood part becomes convex on the veneer surface, but also the wood may be torn from the early wood part itself or between the early wood part and the late wood part. In addition, the effect of shrinkage during the polymerization and curing of the impregnated resin liquid after the heat and pressure treatment is greatly affected in the thickness direction, so that the surface irregularities become more apparent and impair the appearance. A.

Further, if the thickness of the softwood veneer veneer is thinner than 1 mm, breakage such as tearing is likely to occur due to heating and pressing by a flat plate press, while if the thickness is 8 mm or more, it is economically available. In addition to this, it takes a lot of time to impregnate the resin liquid after that, and the productivity is reduced.
A single plate of 8 mm, preferably 3 to 6 mm is used.

The compressed veneer is obtained by inserting this softwood veneer veneer into a flat plate press and applying heat and pressure. The heating and pressurizing condition is that the heating temperature is 100 to 180 ° C. The pressure is set within a range of 10 kgf / cm ^{2 to} 100 kgf / cm ² for about 5 minutes to 60 minutes. If the heating temperature is lower than 100 ° C, the wood fibers cannot be sufficiently plasticized, so that the wood is liable to be damaged.If the heating temperature is higher than 180 ° C, the high temperature will cause the wood to be discolored or deteriorated. The above temperature range, preferably a temperature condition of 130 to 170 ° C. is set.

On the other hand, if the pressing force is less than 10 kgf / cm ² , it is difficult to compress the veneer to a desired density, while if it exceeds 100 kgf / cm ² , the veneer may be damaged by strong pressing force. Since a defective portion is likely to occur, the pressure within the above range, preferably 20 kgf / cm ^{2 to} 60 kgf / cm ² , and the pressure of 130 to 170 kg
3/4 of the original veneer thickness by heat-pressure treatment with heating temperature of ℃
The object is to obtain a compressed veneer having a compactness which is compressed to a thickness of 1/4 and has excellent compactness with high production efficiency.

If the compression ratio of the veneer does not reach the thickness of 3/4 of that of the original veneer, the strength of the veneer itself such as abrasion cannot be sufficiently improved. However, since the resin impregnation amount after this cannot be sufficiently reduced, an inexpensive decorative board with good decorativeness cannot be obtained by reducing the resin impregnation amount. In addition, the material may be broken or the veneer may be damaged, and the density of the wood fiber is increased, so that the impregnation with the resin liquid becomes difficult. Therefore, compression is performed so as to have a thickness of 3/4 to 1/4 of the original veneer thickness, more preferably 2/3 to 1/3 of the original veneer thickness.

Incidentally, a flat plate press as a heating and pressing means is:
For example, a hot plate of a hot press may be provided with a hard plate such as a duralumin plate, and a single plate may be interposed between the hard plates. The irradiation can be performed by irradiating the plate.

When a wooden veneer (softwood veneer veneer) is heated and pressed by a flat plate press, it is necessary for the veneer to contain a certain amount of water for good compression. The water content may be in the range of about 6 to 20% by weight based on the total dry weight of the veneer. It can be easily adjusted by the means described above. If the moisture content of the veneer is less than 6% by weight with respect to the total dry weight, the material is liable to breakage such as tearing by compression by a flat plate press.
When heated and pressed by a flat plate press, a large amount of water vapor is generated in the material, and the so-called puncture is likely to occur on the veneer, which is not preferable.

The compressed veneer thus obtained does not have large cracks or tears, has no significant deformation such as waving, warping, or twisting, is well compacted, and is easy to handle. . Next, a non-hydrophilic polymerizable resin solution is injected and impregnated into the compressed veneer using a known injection method such as a decompression method, a decompression and pressure method, a pressurization method, and an immersion method alone or in an appropriate combination. For example, in order to impregnate the compressed veneer with the resin liquid by the reduced pressure method, the compressed veneer is placed in a closed injection pot, and the air in the pot is degassed by a vacuum pump or the like to increase the degree of vacuum. Then, the polymerization curable resin liquid is poured into the kettle, and the pressure is returned to normal pressure. Thereafter, the inside of the kettle is pressurized with a compressor or the like to further impregnate the compressed veneer with the resin liquid, and the pressure is returned to normal pressure again to collect the excess resin liquid in the kettle outside the kettle.

The non-hydrophilic polymerizable resin liquid to be impregnated into the compressed veneer is a monomer liquid, an oligomer liquid, a prepolymer liquid, or a mixture thereof. Dissolve monomers such as methacrylate, styrene and diallyl phthalate, prepolymers such as acrylic oligomers, unsaturated polyesters and epoxy resins, and polymers such as polymethyl methacrylate, polystyrene and polyvinyl acetate in non-hydrophilic solvents The dissolved processing solution can be used. In addition, a non-hydrophilic solvent, a reaction catalyst, and the like may be added to the polymerization curable resin liquid as needed.

The reason why the non-hydrophilic resin liquid is used as the resin liquid to be impregnated into the compressed veneer is that the wood component has a hydrophilic group. That is, cellulose, hemicellulose, lignin and the like of wood components have a large number of OH groups which are hydrophilic groups, and when impregnated with a hydrophilic liquid such as water having a high affinity for the OH groups, the compressed veneer becomes a veneer. When swelling and trying to return to the original thickness shape, a large amount of resin liquid is impregnated into the veneer due to the swelling, and when this resin liquid impregnated veneer is compressed again, the impregnated resin liquid is removed from the veneer. Since it is squeezed out to the outside, the production efficiency is remarkably deteriorated.
On the other hand, in the non-hydrophilic resin liquid, the remarkable swelling does not occur at the time of impregnation as described above, and the resin liquid is impregnated while maintaining the compressed state. The amount can be reduced and the strength can be further enhanced.

The compressed veneer impregnated with the polymerization-curable resin liquid in this manner is not compressed since the resin liquid is non-hydrophilic and the cell wall does not swell greatly even if the resin liquid is impregnated into the wood cell wall. The resin liquid is impregnated with almost no swelling and maintaining the compressed thickness.

Next, the compressed veneer impregnated with the polymerization-curable resin liquid is heated to harden the resin liquid in the material. As the curing means, heating or pressurization by hot pressing or the like can be used, but depending on the type of the polymerizable curable resin liquid, curing can be performed by a method such as irradiation with an electron beam or ultraviolet rays.

When a resin-impregnated wooden veneer is heated and pressed by a flat plate press such as a hot press, the resin liquid can be heated and cured while the shape of the wooden veneer is fixed by the flat plate press. It is preferable because the accompanying warp and twist of the wooden veneer can be corrected. In this hardening by hot pressing, since it is not necessary to harden the resin liquid at the same time as the compression of the veneer as disclosed in Japanese Patent Application Laid-Open No. Hei 1-182002, a pressure of about 10 kgf / cm ² from a state where almost no pressure is applied is sufficient. Therefore, it is possible to manufacture a resin-reinforced wood decorative board without generating a defective portion such as a crack that is difficult to repair.

In the manufacturing process of such a resin-reinforced wood decorative board, when the wood veneer (coniferous wood veneer) is compressed by the heat and pressure of the flat plate press as described above, the early wood portion of the wood is increased in the thickness direction. The wood fiber is densified because it shrinks greatly and expands in the width direction, so that the wood grain becomes denser and the surface has a new grain appearance as if the original single wood grain (especially the early wood part) was enlarged. . When the compressed veneer is colored by impregnation with a colored resin liquid, the early wood portion of the original wood veneer was light and the late wood portion was dark, but the early wood portion was dark. The late wood part is formed in a light color and the shade is inverted, and in combination with the enlarged grain appearance, a new decorative reinforced wood decorative board different from the original wood veneer is formed. Can be. When the light and shade pattern is the same as that of the original wood veneer and only the grain pattern is changed, a resin liquid that can express the material portion impregnated with the resin liquid in a light color may be used. As such a resin liquid, there is a resin liquid that generates air bubbles in wood and causes the early part having a large amount of impregnation to appear lightly by refraction of light.

The resin-reinforced wood decorative board thus obtained is
The surface is polished to a desired finish by a sander or the like. When this resin reinforced wood decorative board is used as a flooring material, if the thickness is about 8 mm, it can be used as a flooring material in places where severe conditions such as heavy walking flooring materials are used. A plywood, a laminated wood, a fiberboard such as MDF, a particle board, or the like having a base material is laminated as a base plate, adhered to the surface of the base plate, and then polished and finished with a sander or the like, and used for the above applications.

After obtaining the resin-reinforced wood decorative board, this decorative board was laminated and adhered to the base plate to produce a flooring material. Alternatively, a wood veneer was impregnated with a polymer-curable resin liquid. In the subsequent curing step, the resin liquid-impregnated veneers are stacked on a base plate as described above and arranged between hot platens of a hot press. A method of simultaneously bonding the plate and the plate may be adopted, and according to this method, productivity can be improved.

Next, specific examples of the present invention will be described. Example 1 An air-dried specific gravity of 0.38, a water content of 8%, a thickness of 4.9 mm, a width of 100 mm, and a length of 150 mm were placed between cedar wood veneers between hot plates of a hot press in which the hot plates were heated to 140 ° C. Inserted through a duralumin plate, heated and pressurized at a pressure of 35 kgf / cm ² for 20 minutes to obtain a cedar-grain compressed veneer compressed to a thickness of 3.0 mm (61% of the original veneer thickness) Was. Although this compressed veneer was expanded by about 10% in the direction perpendicular to the direction of the wood fibers, no noticeable breakage or deformation such as large cracks or irregularities could not be repaired.

Next, the compressed veneer was placed in a pressure-resistant hermetically sealed injection vessel, and the pressure was reduced to a vacuum of 50 mmHg. Then, a brown colored polymerization comprising 70 parts by weight of methacrylic urethane prepolymer and 30 parts by weight of styrene monomer was performed. A curable resin solution was injected, and the resin solution was impregnated into a compressed cedar veneer veneer by a vacuum method. The veneer impregnated with the resin liquid hardly swelled. Then, the veneer impregnated with the resin liquid was heated by a hot press at 130 ° C. and 10 kgf / cm ² for 20 minutes to form a reinforced wood decorative board.

The obtained reinforced wood veneer has a resin content of about 62% by weight with respect to the veneer weight, and has an inverted wood grain pattern in which the early part is darker than the late part by coloring. In addition, the width of the early wood part was widened, and the wood had a beautiful appearance with a new grain pattern that did not recall the original cedar wood. When this reinforced wood veneer was immersed in water at 20 ° C. for 24 hours, the anti-shrinkage ability (ASE) after immersion was 89% in the width direction (the tangential direction of the wood because it is a single veneer) and the thickness was 89%. 32% in the vertical direction
And high dimensional stability.

The cedar plank veneer used in Example 1 was impregnated and cured with the same polymerizable and curable resin liquid as in Example 1 under the same conditions as in Example 1 without performing hot press treatment by hot pressing. As a result, the resin content became 150% or more, and especially the early impregnated part which was greatly impregnated contracted during the curing of the resin liquid, causing deformation such as warpage and irregularities on the surface of the veneer.
The resin content was too high and the appearance was poorer in decorativeness with a more plastic feel than a woody feel.

Example 2 A hot plate of a hot press in which a hot plate is heated to 140 ° C. is a cedar veneer veneer having an air-dry specific gravity of 0.40, a water content of 10%, a thickness of 5.2 mm, a width of 100 mm and a length of 150 mm. It is inserted through a duralumin plate between the plates, and heated and pressed at a pressure of 45 Kgf / cm ² for 15 minutes to compress it to a thickness of 2.3 mm (44% of the original veneer thickness). I got

Next, this veneer was placed in a pressure-resistant sealed injection pot, and
After reducing the pressure to a vacuum degree of mmHg, methyl methacrylate monomer 50 parts by weight, isobornyl methacrylate monomer 12.5 parts by weight, styrene monomer 23.8 parts by weight, trimethylolpropane triacrylate monomer 11.2 parts by weight, hydroxyethyl methacrylate 2.5 parts by weight A polymerizable curable resin solution was injected, and this resin solution was impregnated into a compressed cedar veneer veneer by a reduced pressure method.

The veneer impregnated with the resin liquid was then cured by heating at 130 ° C. and 7 kgf / cm ² for 20 minutes by hot pressing.
Formed on reinforced wood veneer. The obtained reinforced wood decorative board had a resin content of 65% by weight and exhibited a beautiful appearance having a new grain pattern. In addition, the impregnated resin liquid
97% cured in veneer. The same veneer as in Example 2 was impregnated with the polymerization curable resin liquid used in Example 2 in the same manner as in Example 2 without performing the heat and pressure treatment. 130 ° C, 30Kgf / cm ² pressure by hot press
The veneer was compressed by heating and pressing for 20 minutes, and the resin liquid was cured. The thickness of the cured veneer was reduced to 60% of the original untreated veneer thickness and the resin content was 86% by weight. During the compression hardening process, the resin liquid was squeezed out of the veneer, so that 48% of the impregnated resin (ie, 86
(% By weight) remained in the material, which was uneconomical and caused impregnation unevenness, resulting in poor decorativeness.

[0043]

As described above, according to the method for producing a reinforced wood veneer of the present invention, the wood veneer is heated and pressed by a flat plate press before impregnating the wood veneer with the polymerization-curable resin liquid. Since it is compressed to a thickness of 3/4 to 1/4 of the original thickness, the wood fibers are plasticized by heating and do not cause significant damage to the wood veneer, resulting in 3/4 to 1/4 of the original thickness. 1/4
It can be easily compressed by pressing up to the thickness of a single plate, and it can be compressed into a dense structure by eliminating deformation such as warping and twisting by a flat plate press. The strength is improved.

Further, since the compressed veneer is impregnated with a non-hydrophilic polymerizable and curable resin solution, the wood veneer is not impregnated with the hydrophilic group contained in the wood component as in the case where the veneer is impregnated with a hydrophilic resin solution. A significant amount of resin absorption due to affinity does not cause remarkable swelling to return to the original veneer thickness, and maintains a compressed state even when impregnated with resin liquid, using less resin liquid and economical In addition, there is no problem that the feeling of plastic becomes strong and the decorativeness is deteriorated like the reinforced wood decorative board obtained by the conventional method of injecting a large amount of resin liquid to improve the durability. It is possible to obtain a reinforced wood decorative board exhibiting a certain appearance with a high-grade appearance superior in decorativeness as compared with the wood texture and appearance.

In addition, since a non-hydrophilic polymer-curable resin liquid impregnated in a compressed veneer is cured in a veneer, a strong pressure for further densification during polymerization curing is not required. Therefore, there is no danger that defects such as cracks and pits in the early wood portion that cannot be repaired may occur, and therefore, the reinforced wood decorative board is excellent in decorativeness and has excellent durability such as wear resistance and water resistance. Can be manufactured.

According to the present invention, low-density softwood veneer veneers, which are easy to obtain from the viewpoint of resources, but are difficult to use as flooring materials in severe use environments such as heavy walking, are provided with decorative properties by the above method. , And durability can be provided. That is, by adopting a softwood veneer veneer having an air-dry specific gravity of 0.3 to 0.6, when heated and pressed by the flat plate press,
The wood veneer can be compressed even better to 3/4 to 1/4 of its original thickness without causing significant damage or cracks due to a decrease in compressive strength. Unlike the veneer, it is a veneer veneer in which the early part and the late part are present alternately in layers in the thickness direction, so that the veneer can be uniformly and easily compressed by heat and pressure in the thickness direction. This makes it possible to obtain a compressed veneer that is hardly damaged or has irregularities on the surface, and has a good appearance in which the wood fibers are densely compressed over the entirety.

Then, by impregnating the softwood-grained compressed veneer with a non-hydrophilic polymerizable and curable resin liquid, the veneer is hardly swelled, the amount of the resin liquid impregnated is reduced, and decorativeness without plastic feeling is obtained. And a wooden reinforced decorative board having excellent durability can be manufactured at low cost and with high productivity.

When it is desired to obtain a flooring material that can withstand heavy walking, a softwood veneer veneer having a thickness of 1 to 8 mm can be obtained at a temperature of 100 to 180 ° C. and a temperature of 10 kgf / cm ² to 100 kgf / cm ² . By heating and pressing below, it is possible to efficiently form a compressed veneer having strength such as abrasion resistance of the veneer itself and a denser veneer,
The compressed veneer is impregnated with a non-hydrophilic polymerizable resin solution and cured, making it a reinforced wood material with excellent abrasion resistance, durability and decorativeness suitable for flooring in shops and public facilities where the use environment is severe. The decorative board can be manufactured at low cost and with high productivity.

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-3-108501 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B27K 3/00-5/00

Claims (3)

(57) [Claims] 1. A wood veneer is heated and pressed by a flat plate press to compress it to a thickness of 3/4 to 1/4 of the original veneer thickness. A method for producing a reinforced wood decorative board, comprising impregnating a liquid and polymerizing and curing the polymerizable resin liquid in a veneer in a compressed state. 2. The method according to claim 1, wherein the wood veneer is a softwood veneer veneer having an air-dry specific gravity of 0.3 to 0.6. 3. The thickness of a softwood veneer is 1 to 8 mm, and the softwood veneer veneer is 10 kg at a temperature of 100 to 180 ° C.
method of manufacturing a reinforced wooden veneer according to claim 1 or claim 2, wherein the forming the heating pressurizing compression veneer under the conditions of ^{f / cm 2 ~100Kgf / cm 2} .