JP2009067034A - Decorative plate and method for producing decorative plate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a decorative plate excellent in scratch resistance during long-term use of a caster and in design. <P>SOLUTION: The decorative plate is integrated by stacking a thin single wood plate via an adhesion layer on a surface of a wood base material having at least a hard surface. The adhesion layer has a thickness of 30 to 75 μm by stacking the thin single wood plate in a half-setting state, and comprises an adhesive on the base material side having ≤30° of hardness measured with a type A durometer. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a decorative board used as a flooring and a manufacturing method thereof.

  2. Description of the Related Art Conventionally, a decorative board is known as a flooring material in which a veneer is stuck on a plywood so that a dent does not occur when moving furniture with casters or placing furniture. As a method for producing such a flooring material, for example, as shown in Patent Document 1, MDF (medium density fiberboard) impregnated with resin is stuck on the surface of a woody base material, and woody material is put on the surface of this MDF. A flooring made by sticking a thin veneer has been proposed.

  However, in the floor material manufactured by the method of Patent Document 1, when a hard plastic or iron caster is slid continuously for a long period of time, a hard wooden thin veneer is ground by the hard caster. This causes a shear failure and causes a problem that the thin wood veneer is peeled off.

  Therefore, as shown in Patent Document 2, a method for obtaining a flooring material excellent in scratch resistance by hot pressing with a melamine resin impregnated paper or the like interposed between a wooden substrate and a thin wood veneer is proposed. Has been. This flooring uses SBR (Styrene Butadiene Rubber) as an adhesive to be applied onto a wood substrate or resin-impregnated paper, and the adhesive is exerted on the adhesive by hot pressing, thereby peeling off the thin wood veneer. Suppressed.

  However, even in the flooring of Patent Document 2 above, the thermoset resin-impregnated paper is extremely hard. Therefore, under the production conditions based on the normal adhesive application amount, the use of casters over the long term also causes the upper layer of the adhesive layer to remain. There arises a problem that the wood thin veneer peels off due to delamination.

On the other hand, as a flooring considering the scratch resistance against long-term use of casters, etc., as shown in Patent Document 3, by using a flexible adhesive, the stress is dispersed and the wood thin veneer is peeled off. There is something to try to suppress.
JP-A-4-214301 JP 2004-216612 A JP 2003-21420 A

  However, when the adhesive layer is formed with a flexible soft adhesive as in Patent Document 3, there is a problem that it is difficult to form an adhesive layer having a certain thickness. If you simply increase the amount of adhesive applied to make the adhesive layer thicker, the adhesive oozes out between the wood substrate and the wood thin veneer, or the wood ooze veneer oozes out the adhesive, There is a problem that excessive adhesive oozes out from the surface and the design is poor.

  If the decorative board (floor material) with the adhesive spread on the wood thin veneer as described above is subjected to float blasting by the shot blast method, the portion of the wood thin veneer with the adhesive spread will be ground. It is not possible to do so, and there is a problem in that unevenness occurs in the floating process, and the design of the decorative board is not good.

  This invention is made | formed in view of this point, The place made into the objective is to obtain the decorative board excellent in the scratch resistance with respect to long-term use of a caster, and designability.

  A decorative board according to a first aspect of the present invention is a decorative board in which a thin wooden board is laminated and integrated through an adhesive layer on at least the surface of a wooden base material having a hard surface, and the adhesive layer is semi-cured In the state, the wood thin veneer is laminated to form a base material side adhesive having a thickness of 30 μm or more and 75 μm or less and a hardness of 30 ° or less with a type A durometer.

  According to the above configuration, the adhesive layer has a thickness of 30 to 75 μm and has a hardness of 30 ° or less with a type A durometer, so that the adhesive layer is flexible and has a sufficient thickness, so that the wooden substrate and the thin Since it is interposed between the veneers, even if casters are used for a long period of time, the stress is dispersed and peeling of the thin wood veneer is suppressed.

  In addition, by laminating the thin wood veneer after making the substrate side adhesive semi-cured, the penetration of the substrate side adhesive to the wood thin veneer is suppressed while ensuring the thickness of the adhesive layer. The

  A decorative board according to a second invention is the decorative board according to the first invention, wherein the adhesive layer and the thin wood veneer are joined and integrated by a single-plate-side adhesive.

  According to said structure, the contact bonding layer by a base material side adhesive agent and a wood thin veneer are adhere | attached firmly.

  A decorative board according to a third aspect of the invention is the decorative board according to the second aspect of the present invention, wherein the above-mentioned single-plate-side adhesive is soaked into the wood thin veneer by 50% or less of the thickness of the wood thin veneer. ing.

  According to the above configuration, the adhesive on the veneer side does not soak up to the surface of the thin wood veneer, and the design is not inferior, and at least even when the float blasting process is performed by the shot blast method Since the single plate side adhesive does not soak into the upper half of the thickness of the thin veneer, there is no unevenness in the floating process.

  A decorative board according to a fourth aspect of the invention is the decorative board according to the second or third aspect, wherein a portion of the adhesive on the surface of the wood thin veneer that oozes out from the back surface of the wood thin veneer of the wood thin veneer. Floating process by shot blast method is applied to the depth to reach.

  According to the above configuration, the concave portion is formed by grinding the soft portion of the thin wood veneer by shot blasting. This shot blasting is a process in which a hard and fine blasting abrasive material collides with the surface of a thin wood veneer and scratches the surface. The soft portion of the thin wood veneer is ground little by little. And the hard part remains.

  When this shot blasting method is used, the part where the adhesive is soaked into the thin wood veneer is difficult to grind, but the part where the adhesive is soaked into the wood thin veneer is floated. By adjusting the amount of permeation of the veneer-side adhesive, the unevenness depth of the float-making process is determined.

  According to a fifth aspect of the present invention, there is provided a method for producing a decorative board, comprising: applying a base material side adhesive having elasticity in a cured state to a surface of a wooden base material having a hard surface; An adhesive layer forming step of semi-curing the base material side adhesive to form an adhesive layer, a single plate side adhesive applying step of applying a single plate side adhesive on the adhesive layer, and the single plate side adhesive By laminating a thin wood sheet on the applied adhesive layer to obtain a laminate, and by laminating and integrating the laminate by hot pressing, the thickness of the adhesive layer is 30 μm or more and 75 μm. And a hot-pressing step for obtaining a decorative base material having a hardness of the adhesive layer of 30 ° or less with a type A durometer, and a cosmetic processing step for performing cosmetic processing on the surface of the decorative base material.

  According to said structure, the base material side adhesive apply | coated to the wooden base material surface is semi-hardened, after forming a contact bonding layer, a veneer side adhesive is apply | coated and also a thin wood veneer is laminated | stacked. Since the base material side adhesive is in a semi-cured state, it is possible to prevent the base material side adhesive from spreading into the woody thin veneer and to secure the thickness of the adhesive layer. Further, the adhesive layer and the wood thin veneer are firmly bonded by the veneer side adhesive.

  And the laminated body by which the wooden base material, the contact bonding layer, and the wood thin single board were laminated | stacked is hot-pressed, laminated | stacked and integrated, and a decorative base material is obtained. At this time, the adhesive layer has a thickness of 30 μm or more and 75 μm or less, and has a hardness of 30 ° or less with a type A durometer, that is, a base material side adhesive in which the cured product is in such a state is used. For this reason, a decorative board in which an adhesive layer having sufficient thickness and flexibility is provided can be obtained, and peeling of the thin wood veneer is suppressed even when the caster is used for a long time.

  A decorative plate manufacturing method according to a sixth aspect of the invention is a decorative plate manufacturing method according to the fifth aspect of the invention, wherein the single plate side adhesive is semi-cured after the single plate side adhesive coating step. Further included.

  According to said structure, after making a single board | plate side adhesive into a semi-hardened state, a wood thin single board is laminated | stacked, and the seepage of the single board side adhesive agent to a wood thin single board is suppressed.

  According to a seventh aspect of the present invention, there is provided a method for manufacturing a decorative board comprising: a base material side adhesive applying step of applying a base material side adhesive having elasticity in a cured state to a surface of a wooden base material having a hard surface; On the material-side adhesive, a single-plate-side adhesive application step for applying a single-plate-side adhesive having a lower viscosity than the base-material-side adhesive so that the application means does not come into contact therewith; A semi-curing process for semi-curing the veneer side adhesive, a laminating process for laminating a thin wood veneer on the veneer side adhesive to obtain a laminated body, and laminating and integrating the laminated body by hot pressing By doing so, the thickness of the adhesive layer composed of the base material-side adhesive is 30 μm or more and 75 μm or less, and the hot pressure to obtain a decorative base material in which the hardness of the adhesive layer is 30 ° or less with a type A durometer A pressing process and a cosmetic processing process for performing cosmetic processing on the surface of the decorative base material. .

  According to the above configuration, before the base material side adhesive is semi-cured, the single plate side adhesive is applied so that the coating means does not come in contact, and both the first and single plate side adhesives are semi-cured simultaneously.

  A method for manufacturing a decorative board according to an eighth invention is the method for manufacturing a decorative board according to any one of the fifth to seventh inventions, wherein the wood thin unit is formed by shot blasting after the hot-pressing step. A float processing step is further included in which the top surface of the board is floated to a depth that reaches a portion that penetrates from the back surface of the wood thin single plate of the single plate side adhesive.

  In other words, in the floating process by the shot blasting method, the portion where the single plate-side adhesive of the wood thin single plate has permeated becomes difficult to be ground. According to the above configuration, the depth of unevenness of the floating process is adjusted by adjusting the amount of soaking of the adhesive on the veneer side by applying the float process to the wood sheet veneer where the veneer side adhesive has soaked. Is determined.

  ADVANTAGE OF THE INVENTION According to this invention, peeling of a thin wood board | plate can be suppressed effectively, while being able to improve the scratch resistance with respect to long-term use of a caster, the decorative board excellent in the design property can be obtained.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[Decorative board]
A decorative board according to an embodiment of the present invention includes a wood base material and a wood thin veneer adhered to the surface of the wood base material via an adhesive layer, and is used as a flooring material.

(Wood base)
The wood base material may be wood, for example, a wood fiber board such as an insulation board, MDF, or hard board, a plywood board, or a particle board, as long as the wood base material is composed of at least a hard wood base material.

  As a reinforcing method to harden the surface of the wooden substrate, the surface layer may simply be impregnated with melamine resin, phenol resin, epoxy resin, urethane resin or isocyanate resin, or melamine resin impregnated paper Further, a reinforcing layer made of various resin-impregnated paper such as phenol resin-impregnated paper may be provided on the surface layer. Also, instead of resin-impregnated paper, hard artificial resin wood mainly made of wood powder, wood fiber, wood slices, etc., and kneaded and molded with various resins, hard wood fiber boards such as MDF, hardboard, etc. The surface may be reinforced with a wooden substrate.

  Moreover, you may stick hard wooden base materials, such as MDF and a hard board, on the surface, such as a plywood. In this case, the MDF, the hard board and the like may be reinforced with resin impregnation.

  In any case, the soft wooden substrate surface needs to be strengthened to withstand long-term and continuous use of casters.

(Adhesive layer)
The adhesive layer has a thickness of 30 to 75 μm, and is made of a cured product of an elastic base material side adhesive having a hardness of 30 ° or less with a type A durometer. As described above, since the adhesive layer has sufficient thickness and elasticity, it is possible to suppress peeling of the thin wood veneer even for a long-term and continuous load of the caster.

  Further, in order to firmly bond the adhesive layer composed of the base material side adhesive and the wood thin veneer, they are preferably joined and integrated by the veneer side adhesive. The application amount of the veneer-side adhesive is preferably the minimum amount necessary to suppress the stain on the thin wood veneer. Furthermore, as will be described in detail later, after the veneer side adhesive is made into a semi-cured state, the wood thin veneer is laminated, and the laminate in which the wood base material and the wood thin veneer are laminated is hot-pressed. When laminating and integrating, the single-plate-side adhesive is preferably one that can achieve a desired strength, and can further suppress bleeding.

  The base material side adhesive and the veneer side adhesive may be the same adhesive or different types of adhesives, but at least the base material side adhesive has a hardness of the cured product. May be any type A durometer that is 30 ° or less and has elasticity.

  It is preferable that the above-mentioned substrate side or veneer side adhesive has a stain of 50% or less of the thickness of the wood thin veneer. By suppressing the amount of permeation in this way, it is possible to effectively carry out a floating process by a shot blast method described later.

  Examples of the base-side adhesive include acrylic resins, vinyl acetate resins, latex resins, rubber resins, vinyl urethane resins, urethane resins and modified resins thereof, these resins and urea melamine resins, A mixture with an epoxy resin, a phenol resin, an isocyanate resin, or the like is preferably used.

  Furthermore, in order to increase the application amount of the base-side adhesive, it is preferable to add various thickeners and extenders to increase the viscosity. As the thickener, for example, flour or poval is used. As the extender, calcium carbonate, alumina, titanium oxide or the like is used.

  Moreover, in order to improve the concealment property of a wooden base material, various pigments may be added and colored by the base material side adhesive.

  As the veneer side adhesive, for example, acrylic resin, vinyl acetate resin, latex resin, rubber resin, vinyl urethane resin, urethane resin and their modified resins, urea melamine resin, epoxy resin, Phenol resins, isocyanate resins and the like, and mixtures of these resins are preferably used.

  The veneer side adhesive preferably has elasticity, but any adhesive can be used as long as the cured product is not extremely brittle and hard. It is preferable to consider the strength and flexibility of an epoxy resin or a melamine resin blended with a vinyl acetate resin or a latex resin. In addition, the veneer side adhesive preferably has strong adhesiveness in order to firmly bond the adhesive layer composed of the base material side adhesive and the thin wood veneer, while the adhesive on the base material side It may have a lower viscosity.

  A curing agent is appropriately added to the adhesive to promote curability. As the curing agent, a thermal reaction type, an ultraviolet curing type, or the like may be appropriately selected, and these may be combined. Further, the curing agent includes a curing agent that reacts with relatively low-temperature heat that causes the adhesive to be semi-cured, and a curing agent that does not react in the process of semi-curing the adhesive but reacts in the hot press process. It is preferable to use together.

  The decorative board of the present invention forms a thick adhesive layer with the base material side adhesive, and puts the base material side adhesive into a semi-cured state before laminating the wood thin veneer on the wood base material. For this reason, in order to make the adhesive layer into a semi-cured state by heat curing, a large-scale dryer facility is required. Therefore, an ultraviolet curable curing agent can be added and instantaneously made into a semi-cured state by ultraviolet irradiation. preferable.

  In order to effectively control the permeation to the wood thin veneer, it is desirable to laminate the wood thin veneer after making it into a semi-cured state. Moreover, since the single-plate-side adhesive also has ultraviolet curing characteristics, it can be made into a semi-cured state by irradiation with ultraviolet rays, and a decorative plate can be produced efficiently.

(Woody thin veneer)
As the wood thin veneer, a natural wood material or a thin slice obtained by slicing these laminates can be used. As the natural wood material, any material such as conifers, broad-leaved trees, so-called fast-growing trees can be used. Moreover, what sliced the laminated body of natural wooden material is what is called an artificial veneer.

  Moreover, a dry veneer or a raw veneer (so-called wet veneer) can be used for the thin wood veneer. If the thickness of the wood thin veneer is too thick, not only will it become hard, but the resistance to dry cracking of the veneer itself will deteriorate, so the thickness of the wood thin veneer is preferably about 0.15 to 1.0 mm. In consideration of the subsequent floating process, the thickness of about 0.25 to 0.6 mm is more preferable.

[Production method]
Next, the manufacturing method of the said decorative board is demonstrated.

(Substrate side adhesive application process)
First, a base material side adhesive is applied to the wood base material. As a means for applying the substrate side adhesive, a flow coater or a roll coater is preferably used. The base material side adhesive is applied so that an adhesive layer having a thickness of 30 to 75 μm is formed.

(Adhesive layer forming process)
Next, an adhesive layer is formed with the base material side adhesive in a semi-cured state.

  In general, the base material side adhesive is semi-cured by drying with a ventilation dryer. The temperature of the dryer is preferably about 40 to 60 ° C., and the board surface temperature of the wooden base material is set not to exceed 80 ° C. This is because when the board surface of the wooden substrate is 80 ° C. or higher, the adhesive is cured before the step of hot-pressing the laminate.

  The equipment to be used in the semi-cured state by ultraviolet irradiation is appropriately selected depending on the type of photoinitiator used. Specifically, a metal halide lamp, an electrodeless D lamp, a V bulb, a Q bulb, an M bulb, a pulse UV method, or the like is used.

(Single plate side adhesive application process)
A single plate side adhesive is applied on the adhesive layer. In addition, you may apply | coat this single-plate side adhesive, before making a base material side adhesive into a semi-hardened state. It is only necessary that the base material side adhesive is in a semi-cured state before at least laminating the wood thin veneer.

  When applying the veneer side adhesive after making the base material side adhesive semi-cured, the application means is not particularly limited. What is necessary is just to select the application | coating method according to the application quantity of the target single-plate side adhesive agent, for example, a roll coater, a flow coater, a spray etc. are suitable.

  On the other hand, in the case where the single-plate adhesive is applied before the substrate-side adhesive is not dried and becomes a semi-cured state, the application method is limited to a non-contact method in which the application means does not contact the adhesive layer. For example, it is limited to a system such as a flow coater or a spray.

(Semi-curing process)
When the veneer side adhesive is applied after the base material side adhesive is semi-cured, the veneer side adhesive is then brought into a semi-cured state. The method for making the veneer side adhesive in a semi-cured state is the same as the method for making the base material side adhesive in a semi-cured state as described above. .

  On the other hand, when the single-plate-side adhesive is applied before the base-material-side adhesive is brought into a semi-cured state, the base-material-side adhesive and the single-plate-side adhesive are semi-cured together. The method for bringing these into a semi-cured state is also the same as the method for bringing the base material side adhesive into a semi-cured state.

  In addition, the wood thin veneer may be placed without semi-curing the veneer side adhesive, but in order to suppress the penetration of the veneer side adhesive onto the wood thin veneer, It is preferable to place the thin wood veneer after the side adhesive is in a semi-cured state.

(Lamination process)
At least the base material side adhesive is in a semi-cured state, and the next wood thin veneer is placed.

  A thin laminate of wood is placed on the base-side adhesive in a semi-cured state, the single-plate-side adhesive in a semi-cured state or an uncured state, and a laminate is obtained. The placed wood thin veneer may be temporarily fixed. As a method for temporary fixing, a method in which moisture in the temporarily fixed portion is blown off by high frequency or the like and the single plate side adhesive is solidified is preferably used.

(Hot press process)
Next, in order to obtain a decorative base material by stacking and integrating the laminate, the laminate is hot-pressed. There are various hot pressing methods such as a general roll press and a flat plate press, and a flat plate press is preferably used. The hot press is performed at a temperature of 100 to 130 ° C. and 0.2 to 1.0 MPa for about 30 to 90 seconds. Thereby, the base material side adhesive and the single plate side adhesive are completely cured, the thickness of the adhesive layer is not less than 30 μm and not more than 75 μm, and the hardness of the adhesive layer is not more than 30 ° with a type A durometer. The body is laminated and integrated.

  At this time, the stain on the wood thin veneer on the veneer side adhesive is 50% or less of the thickness of the wood thin veneer.

(Floating process)
Next, the surface of the decorative base material is floated by a shot blast method. The shot blasting process is a process in which a hard and fine blasting abrasive is made to collide with the surface of a thin wood veneer to cause fine scratches on the surface. Thereby, the soft part of a wood thin veneer is ground, a hard part remains, and the decorative base material which has an unevenness | corrugation on the surface can be obtained.

  As abrasives for blasting, glass beads, glass powder, inorganic particles such as silicon, metal particles such as alumina, hard organic particles pulverized with walnuts and peach seeds, or dry ice particles pulverized with dry ice Is used. Such an abrasive for blasting is ejected from a nozzle and is made to collide with the surface of the decorative base material to carry out a floating process. In addition, it is not necessary to give a floating process to a decorative base material.

(Makeup process)
Lastly, a makeup is applied by applying a transparent resin paint to the surface of the decorative base that has been subjected to the above-described floating process or a surface of the base that has been uniformly ground, and then curing the same to form a transparent resin coating film. A decorative board is obtained by processing.

[Effect of the embodiment]
As described above, the decorative board according to the embodiment of the present invention has a thickness of 30 μm or more and 75 μm or less as an adhesive layer, and has a hardness of 30 ° or less with a type A durometer and has elasticity, so that it is flexible and sufficient. A thick adhesive layer is interposed between the wood substrate and the wood thin veneer, and even if casters are used continuously for a long time, the stress is dispersed and the wood thin veneer is Separation can be effectively suppressed.

  In addition, since the thin wood veneer is laminated after the base material side adhesive is made semi-cured, it suppresses the spread of the base material side adhesive to the thin wood veneer while ensuring the thickness of the adhesive layer. Can do.

  In addition, since the adhesive layer and the wood thin veneer are joined and integrated with the veneer side adhesive, the adhesive layer and the wood thin veneer are firmly bonded to more effectively suppress the dent of the decorative board. be able to.

  In addition to suppressing the spread of the base material side adhesive to the wood thin veneer and taking into account the suppression of the veneer of the veneer side adhesive to the wood thin veneer, the shot blast method is applied to this decorative board. When a floating process is performed, unevenness is less likely to occur, and a decorative board with excellent design can be obtained.

  In addition, the amount of the single plate side adhesive that permeates the wood thin veneer is 50% or less of the thickness of the wood thin veneer so that the surface of the wood thin veneer does not bleed. In addition, the occurrence of unevenness can be more reliably suppressed during the floating process by the shot blasting method, and a decorative board that is more excellent in design can be obtained.

  Furthermore, the depth of unevenness of the float process is determined by adjusting the amount of soaking of the adhesive on the veneer side by applying the float process to the part where the veneer side adhesive penetrates the thin wood veneer. Therefore, it is possible to effectively carry out floating processing.

Example 1
A 2.7 mm thick MDF was stuck to the surface of a 9 mm thick softwood plywood with a vinyl urethane adhesive by a cold press to obtain a wooden substrate.

What mixed 5 weight part of isocyanate adhesives with respect to 95 weight part of modified vinyl acetate adhesives as a base material side adhesive agent was apply | coated to the surface of MDF of the said wooden base material. The resin fraction of the base-side adhesive was about 50%, and the coating amount was 15 g / scale ² . The hardness of the cured product obtained by curing the substrate-side adhesive was 25 ° when measured with a Shore hardness meter (type A).

  The woody base material coated with the base material side adhesive was dried by ventilation at 80 ° C. for 1 minute and cooled by ventilation until reaching room temperature, thereby forming an adhesive layer in which the base material side adhesive was semi-cured.

On the adhesive layer, a mixture of 59 parts by weight of melamine resin and 1 part by weight of thickener is applied to 40 parts by weight of the acrylic resin as the single-plate-side adhesive, and the mixture is applied at 80 ° C. for 10 minutes. Ventilated and dried and cooled by cooling to room temperature. The resin fraction of the veneer side adhesive was about 50%, and the coating amount was 10 g / scale ² .

  A white oak raw veneer as a wood thin veneer having a thickness of 0.35 mm was laminated on the adhesive layer coated with the veneer side adhesive to obtain a laminate. The laminate was hot-pressed at 120 ° C. under a 0.8 MPa pressure with a press schedule of 60 seconds to obtain a decorative base material.

  The surface of the decorative base material obtained as described above had no adhesive oozing.

  Then, the surface of the decorative substrate was uniformly ground with a wide belt sander by a thickness of 0.05 mm, and a transparent resin coating was formed by applying a transparent resin paint to obtain a decorative board.

  When the cross section of the decorative board obtained as described above was observed with a microscope, the thickness of the adhesive layer was about 30 μm.

  A caster resistance test was performed on the decorative board. The caster resistance test is a test in which a load of 25 kg is placed on an iron single wheel caster having a diameter of 50 mm and a 300 m length is reciprocated 500 times. The moving speed of the caster is about 2 seconds / reciprocation, and the dent amount on the decorative board surface after the test is measured and the state is visually confirmed.

  The test results of the caster resistance test showed that the dent amount on the decorative plate surface was 0.1 mm at the maximum, and peeling of the thin wood veneer was not confirmed.

(Example 2)
The surface of the decorative base material obtained in Example 1 was floated by the shot blast method. By this floating process, a portion other than the soft conduit was preferentially ground, a hard conduit portion remained, and a decorative base material having an excellent appearance with an uneven feeling could be obtained. After polishing the surface of this decorative substrate with a sponge containing an abrasive, a transparent resin coating was applied to form a transparent resin coating film to obtain a beautiful decorative board.

  A caster resistance test was also performed on the decorative board made as described above. After reciprocating 500 times, problems such as peeling of the thin wood veneer were not confirmed.

(Comparative Example 1)
The decorative board of Comparative Example 1 is the makeup of Example 1 in that the base-side adhesive is a mixture of 60 parts by weight of urea melamine resin adhesive and 40 parts by weight of modified vinyl acetate adhesive. Unlike the board, the rest was the same as in Example 1, and a decorative board was obtained by the same manufacturing method. The strength of the adhesive layer was measured and found to be 80 °.

  As a result of performing the caster resistance test, when the wood was reciprocated 300 times, shear failure of the wood thin veneer was confirmed, and the adhesive layer between the MDF and the wood thin veneer was subjected to interfacial peeling.

(Comparative Example 2)
The decorative board of Comparative Example 2 is the same as that of Comparative Example 1 except that the coating amount of the base-side adhesive is 35 g / scale ^2, and this base-side adhesive is not dried, that is, not semi-cured. Without using the plate-side adhesive, a 0.35 mm white oak veneer was laminated to obtain a laminate. This laminate was hot-pressed at 120 ° C. under a pressure of 0.8 MPa for 60 seconds to obtain a decorative base material.

  In this case, not only the adhesive protruded from between the wood substrate and the wood thin veneer, but also a considerable amount of adhesive soaking was confirmed on the surface of the wood thin veneer.

  The surface of the decorative substrate was uniformly ground with a wide belt sander by 0.05 mm, and a transparent resin coating was formed by applying a transparent resin paint to obtain a decorative board.

  When the surface of the decorative board was observed with a microscope, the thickness of the adhesive layer was not uniform, and the average thickness was 7 μm.

  Moreover, the caster-proof test was done with respect to the said decorative board. As a result of the test, the surface dent was about 0.15 mm at the maximum after 500 reciprocations. Moreover, the shear failure of the thin wood single board between the contact bonding layer and the transparent resin coating film had generate | occur | produced.

(Comparative Example 3)
The surface of the decorative base material obtained in Comparative Example 2 was floated by a shot blast method. The portion of the wood thin veneer where the adhesive oozed out was hardly ground, and unevenness occurred in the floating process.

  As described above, the present invention is useful for a decorative board used as a flooring and a method for producing the same.

Claims (8)

It is a decorative board in which a wooden thin veneer is laminated and integrated via an adhesive layer on the surface of a wooden base material having at least a hard surface,
The adhesive layer is composed of a base-side adhesive that has a thickness of 30 μm or more and 75 μm or less and a hardness of 30 ° or less with a type A durometer, by laminating wood thin veneers in a semi-cured state. A decorative board characterized by The decorative board according to claim 1,
A decorative board, wherein the adhesive layer and the wood thin veneer are joined and integrated by a veneer side adhesive. The decorative board according to claim 2,
A decorative board, characterized in that the above-mentioned single board side adhesive has a stain of 50% or less of the thickness of the wood thin single board. The decorative board according to claim 2 or 3,
A decorative board characterized in that the surface of the wood thin veneer is subjected to a float blasting process by a shot blasting method to a depth reaching a portion where the veneer side adhesive penetrates from the back surface of the wood thin veneer. . A base material side adhesive applying step of applying a base material side adhesive having elasticity in a cured state to the surface of a wooden base material having a hard surface at least;
An adhesive layer forming step of semi-curing the base material side adhesive to form an adhesive layer;
A single plate side adhesive application step of applying a single plate side adhesive on the adhesive layer;
A laminating step of laminating a thin wood veneer on the adhesive layer to which the veneer side adhesive is applied;
A decorative base material in which the thickness of the adhesive layer is 30 μm or more and 75 μm or less and the hardness of the adhesive layer is 30 ° or less with a type A durometer by hot-pressing the laminated body and integrating the layers. A hot pressing process to obtain;
A method for producing a decorative board, comprising: a cosmetic processing step of performing cosmetic processing on the surface of the decorative base material. In the manufacturing method of the decorative board of Claim 5,
The method for producing a decorative board, further comprising a semi-curing step of semi-curing the single-plate side adhesive after the single-plate side adhesive applying step. A base material side adhesive application step of applying a base material side adhesive having elasticity in a cured state to the surface of a wooden base material having a hard surface at least;
On the substrate side adhesive, a single plate side adhesive application step for applying a single plate side adhesive having a lower viscosity than the base material side adhesive so that the application means does not come in contact with it,
A semi-curing step of semi-curing the base material side adhesive and the veneer side adhesive;
A laminating step of laminating a thin wood veneer on the veneer side adhesive to obtain a laminate;
The thickness of the adhesive layer composed of the base material side adhesive is 30 μm or more and 75 μm or less and the hardness of the adhesive layer is a type A durometer by hot pressing the laminate and integrating the laminates. A hot-pressing step for obtaining a decorative substrate of 30 ° or less;
A method for producing a decorative board, comprising: a cosmetic processing step of performing cosmetic processing on the surface of the decorative base material. In the manufacturing method of the decorative board of any one of Claim 5 to 7,
After the hot-pressing process, the float is made by shot blasting to the surface of the wood thin veneer up to the depth that reaches the part of the wood veneer from the back of the wood thin veneer. A method for producing a decorative board, further comprising a processing step.