JP2010046866A - Wood decorative plate and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wood decorative plate capable of favorably exhibiting higher desine property and heavy woody feeling and sufficiently protecting a design surface of a sliced veneer. <P>SOLUTION: A sealer layer 22 and a top coat layer 26 are formed by piling up on the design surface 18 of the sliced veneer 14 firmly fixed to a substrate with the thickness not to bury an opening part 20 of a conduit pipe existing on the design surface 18. Recessed parts 32, 30 corresponding to the opening part 20 of the conduit pipe are provided to the sealer layer 22 and the top coat layer 26, and the sealer layer 22 is formed by a cured product produced through a curing reaction of the component having a hydroxy group in the sliced veneer 14 or moisture of the sliced veneer 14 with polyisocyanate. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a wooden decorative board and a method for producing the same, and in particular, an improvement of a wooden decorative board formed by laminating a sealer layer and a topcoat layer on a design surface of a wooden veneer fixed on a hard substrate. And an advantageous method for producing such a wood veneer.

  Conventionally, a wood decorative board obtained by sticking wood (projection board) having a beautiful pattern such as wood grain on the surface of a substrate can obtain a high-quality wood surface easily and at low cost. It has been widely used as a surface material for various products such as interior parts, furniture, building materials, and home appliances.

  And in such a wood decorative board, generally, the top coat layer which consists of a transparent coating film which protects it on the design surface of a veneer is laminated and formed by clear painting (painting using clear paint). In addition, the veneer design surface (decorative plate surface) can be prevented from being scratched, and gloss can be imparted to the veneer design surface (for example, see Patent Document 1 below). Further, in many cases, in such a wooden decorative board, a sealer layer is formed between the veneer and the top coat layer to improve the adhesion of the top coat layer to the veneer. Such a sealer layer is generally formed of polyurethane that exhibits excellent adhesion to the veneer.

  By the way, as a kind of painting method (painting finish) on the design surface of various wood products, so-called open pore coating (open pore finishing) is applied so that the conduit opening in the design surface of wood products is not filled with paint (finishing). )It has been known. In the wood product to which the open pore coating is applied, a minute or minute concave portion (including a concave groove, which will be used in the same meaning hereinafter) corresponding to the opening of the conduit is formed on the design surface. As a result, it becomes possible to obtain a touch with a deep shadow and a feeling of unevenness, so that a more excellent design and a more natural and heavy wood texture can be effectively exhibited.

  However, in the above-described conventional wooden decorative panel, when a top coat layer made of a transparent coating is formed by open pore coating in order to obtain a better design and a natural and heavy wood texture, that is, a conduit When the topcoat layer is formed so as to have a recess corresponding to the opening, the following problem may occur.

  That is, when the design surface is applied by open pore coating, it is necessary to make the coating film sufficiently thin so that the opening of the conduit on the design surface is not filled with the paint. Therefore, when the top coat layer that is laminated on the design surface of the veneer veneer is formed by open pore coating, the thickness of the top coat layer is set so that the opening of the conduit on the veneer design surface is not filled. Is made thin enough. For this reason, in the wooden decorative board in which the top coat layer is formed by open pore coating, the hardness of the top coat layer is reduced by the amount of the reduced thickness of the top coat layer. As a result, the top coat layer However, there is a concern that the role of protecting the design surface of the veneer cannot be sufficiently fulfilled, and the adverse effect that the design surface of the veneer is likely to be damaged is caused.

  In addition, if the thickness of the top coat layer is increased in the wooden decorative board, the hardness of the top coat layer is increased, and the protection function of the veneer design surface by the top coat layer can be sufficiently ensured. However, in that case, the depth of the recess corresponding to the opening of the conduit is reduced, or it becomes difficult to form such a recess, and the top coat layer is no longer formed by open pore coating. It cannot be said that it was formed. As a result, the improvement in the design and wood texture that should be obtained in the wood decorative board in which the top coat layer is formed by open pore coating cannot be expected.

JP 2002-347007 A

  Here, the present invention has been made in the background of the above-described circumstances, and the problem to be solved is that the top coat layer is formed by open pore coating, thereby providing a more advanced design property. And a natural and heavy wood texture can be advantageously exhibited, and the design surface of the veneer is sufficiently protected to effectively prevent damage to the design surface. It is in. In addition, in the present invention, it is an object of the present invention to provide a method for producing such a wooden decorative board more easily and at a low cost.

  The inventors have made various studies in order to solve the problems as described above, and for the purpose of improving the adhesion of the top coat layer to the veneer design surface, the veneer design surface and the top coat layer It was conceived that by increasing the hardness of the sealer layer formed between the two layers, the sealer layer shared the role of protecting the veneer design surface together with the top coat layer. As a result of further research on the material for forming such a high-hardness sealer layer, the inventors of the present invention, from the polyisocyanate cured product produced by applying only the polyisocyanate curing agent to the veneer design surface. The resulting sealer layer is a conventional general sealer layer, that is, a cured product of a polyol and a polyisocyanate produced by applying a mixture of a main component of a polyol and a curing agent of a polyisocyanate to a veneer design surface ( It has been found that it has a sufficiently higher hardness than a sealer layer made of polyurethane.

  That is, the present invention has been completed based on such knowledge, and the gist of the present invention is that a wooden veneer having a design surface in which a conduit opens is formed on a surface opposite to the design surface. In the wooden decorative board in which a top coat layer composed of a transparent coating film that is fixed on a hard base material and protects the design surface is laminated on the design surface of the veneer via a sealer layer The top coat layer and the sealer layer are laminated with a thickness that does not fill the opening of the conduit in the design surface with respect to the design surface of the protruding plate, and the top coat layer and the sealer layer are formed. On the other hand, each of the recesses corresponding to the opening of the conduit is provided, and the sealer layer is generated by a curing reaction between a component having a hydroxyl group in the veneer and moisture of the veneer and a polyisocyanate. Hard Things in, is that it is formed on the wood veneer according to claim.

  In addition, according to one of the preferable aspects of the wooden decorative board according to this invention, the colored layer for coloring the design surface of the said veneer is further formed between the said sealer layer and the said topcoat layer.

  And in the present invention, (a) a step of preparing a hard base material, and (b) a wooden projecting plate provided with a design surface where the conduit opens, on the surface opposite to the design surface, A step of adhering to the base material, and (c) applying a polyisocyanate on the design surface of the projecting plate with a thickness that does not fill the opening of the conduit on the design surface, A cured product of the polyisocyanate is produced by a curing reaction with a component having a hydroxyl group in the veneer and moisture of the veneer, and a sealer layer made of the cured polyisocyanate is formed on the design surface of the veneer. Forming a laminate and forming a first recess corresponding to an opening of a conduit in the design surface of the projecting plate on a surface opposite to the projecting plate side of the sealer layer; and (d) the sealer layer Opposite to the protruding plate side On the surface, a clear paint is applied at a thickness that does not fill the first concave portion formed on the surface, and a transparent coating film is formed, whereby the design of the projecting plate made of the transparent coating film A top coat layer that protects the surface is laminated on the sealer layer, and a second recess corresponding to the first recess of the sealer layer is formed on the surface of the top coat layer opposite to the sealer layer side. The gist of the manufacturing method of the wood decorative board characterized by including the process of forming is also made into the summary.

  In addition, according to one of the advantageous aspects of the method for producing a wood decorative board according to the present invention, after the sealer layer is laminated on the design surface of the veneer, coloring for coloring the design surface of the veneer A layer is formed on the surface of the sealer layer opposite to the veneer side, and then the clear paint is applied to the surface of the colored layer opposite to the sealer layer side, so that the transparent By forming a transparent coating film, the top coat layer made of the transparent coating film is laminated and formed on the surface of the sealer layer opposite to the projecting plate side via the colored layer.

  That is, in the wood decorative board according to the present invention, the top coat layer and the sealer layer side are laminated and formed with a thickness that does not fill the opening of the conduit with respect to the design surface of the projecting board, and the top coat layer A recess corresponding to the opening of the conduit is formed in the sealer layer. That is, the top coat layer and the sealer layer are formed by open pore coating on the design surface of the protruding plate. Therefore, in such a wood decorative board, the concave portion formed in the top coat layer can cause the surface to have a deep shadow and a texture with unevenness, so that even better design can be exhibited. A more natural and heavy wood texture can be obtained.

  And in the wood decorative board according to the present invention, the sealer layer is adsorbed on the design surface of the veneer or the component having a hydroxyl group in the veneer (for example, cellulose) or the moisture of the veneer (for example, contained in the veneer. Is formed by applying a conventional polyol main agent and a polyisocyanate curing agent to the veneer design surface. Sufficiently higher hardness can be ensured than a sealer layer made of a cured product of polyol and polyisocyanate. Thereby, since the topcoat layer is formed by an open pore finish, the sealer layer having a sufficiently high hardness is formed even though the thickness is reduced and the hardness is reduced. Together with the layer, the role of protecting the design surface of the veneer is reliably and sufficiently exhibited. As a result, the design surface of the projecting plate is sufficiently protected by the top coat layer and the sealer layer, so that damage to the design surface of the projecting plate can be extremely effectively prevented.

  Therefore, in such a wood decorative board according to the present invention, high design and natural and heavy wood texture can be more stably exhibited over a longer period of time.

  Further, in the wood decorative board according to the present invention, only the polyisocyanate is applied to the design surface of the veneer, and the sealer layer is generated by a curing reaction between the component having a hydroxyl group in the veneer and the moisture of the veneer and the polyisocyanate. It is formed with a cured product. Therefore, for example, as compared with the case where a sealer layer is formed with a cured product of polyol and polyisocyanate, which is produced by applying a mixture of a polyol main component and a polyisocyanate curing agent to a veneer design surface. The sealer layer can be formed very simply and at low cost.

  Then, according to the method for producing a wood decorative board according to the present invention, a wood decorative board that can exhibit a high degree of design and a natural and heavy wood texture more stably over a longer period of time is easier. In addition, it can be manufactured at low cost.

  Hereinafter, in order to clarify the present invention more specifically, a representative embodiment of the present invention will be described in detail with reference to the drawings.

  First, in FIG. 1, as an example of a wooden decorative board according to the present invention, a part of a wooden decorative board 10 used as an automobile interior part is schematically shown in a vertical cross-sectional form. As apparent from FIG. 1, the wood decorative board 10 of the present embodiment has a rectangular shape having a thickness of about 3 to 6 mm as a whole. And it has the base material 12 which comprises the back surface side part, and the protrusion board 14 is adhere | attached through the adhesive bond layer 16 on this base material 12. FIG.

  The base material 12 is a hard material, for example, an ABS resin, polycarbonate / ABS resin, polypropylene resin, polyethylene resin, nylon resin, noryl resin, polybutylene terephthalate resin, which is often used as a material for forming interior parts for automobiles. It is formed using a thermoplastic resin material such as, and has a rectangular shape having a thickness of about 2 to 5 mm as a whole. In FIG. 1 and FIGS. 2 to 6 to be described later, the total thickness of the wooden decorative board 10 and the thickness of the base material 12, and further, the thickness of each layer formed on the base material 12 are shown. It should be understood that the exaggeration is shown with a balance different from the actual thickness.

  The veneer 14 is made of various kinds of beautiful wood such as Obankor, Bubinga, Bird's Eye Maple, Curly Maple, Claro Walnut, White Ash Bar, Sapele Mahogany, Sugi, Cypress, Cherry, Teak, and the like. It is made of a flat plate material obtained by slicing with a thickness of about 0.1 to 0.3 mm so that a desired grain such as the above appears.

  As apparent from FIGS. 1 and 2, in the projecting plate 14, one surface in the thickness direction is a design surface 18, and the design surface 18 includes a conduit opening therein. A large number of openings 20 are present. Although these many conduit openings 20 are not clearly shown in FIG. 2, those having a groove shape extending with various lengths and widths on the design surface 18 and those having hole shapes of various sizes, etc. Is made up of various types. Also, the various types of conduit openings 20 all have a very small depth.

  On the other hand, the adhesive layer 16 interposed between the protruding plate 14 and the base material 12 is formed of a known adhesive such as a urethane-based adhesive. The adhesive layer 16 fixes the protruding plate 14 to the base material 12 on the surface opposite to the design surface 18. The thickness of the adhesive layer 16 is generally about 15 to 35 μm.

  Further, in the wood decorative board 10 of the present embodiment in which the veneer 14 is fixed to the base material 12, the sealer layer 22, the colored layer 24, and the top coat layer 26 are provided on the design surface 18 of the veneer 14. They are stacked in order. The colored layer 24 located in the middle of the three layers 22, 24, and 26 is made of a colored coating film, and is intended to color the design surface 18 of the projecting plate 14 to adjust the color tone of the design surface 18. Are stacked on the design surface 18. In addition, the kind of colored coating material which provides such a colored layer 24 is not specifically limited, It selects suitably from the thing which can color the wooden decorative board 10 to a desired color.

  The colored layer 24 has a thickness that does not fill a large number of conduit openings 20 existing on the design surface 18 of the projecting plate 14, for example, an extremely thin thickness of about 30 μm or less, preferably about 25 μm or less. As a result, in the colored layer 24, a number of intermediate recesses 28 are formed at positions corresponding to the respective conduit openings 20 on the design surface 18 of the projecting plate 14 and open on the surface opposite to the projecting plate 14 side. In addition, since the coloring effect of the design surface 18 of the protruding plate 14 may not be sufficiently obtained if the thickness of the colored layer 24 is too thin, the thickness of the colored layer 24 should be about 10 μm or more. Is desirable.

  On the other hand, the topcoat layer 26 laminated on the surface of the colored layer 24 opposite to the design surface 18 side of the protruding plate 14 is made of a colorless and transparent coating film. Then, the design surface 18 of the veneer 14 is prevented from being scratched and the design surface 18 is protected, and the surface side portion of the wooden decorative board 10 is provided with a role such as imparting gloss and depth to the design surface 18. Forming. In addition, as a paint for forming the top coat layer 26, for example, a clear paint made of a resin material that gives a transparent resin layer such as an acrylic resin, a polycarbonate resin, a cycloolefin resin, a norbornene resin, a polyarylate resin, or the like. A clear paint containing a resin material is appropriately used.

  In this case, the top coat layer 26 is provided on each of the conduit openings 20 on the surface opposite to the projecting plate 14 side of the colored layer 24, and further on the many conduit openings 20 on the design surface 18 of the projecting plate 14. The intermediate recesses 28 provided corresponding to the thicknesses of the intermediate recesses 28 are set so as not to be filled, for example, an extremely thin thickness of about 150 μm or less. As a result, the top coat layer 26 has an outer recess 30 serving as a second recess, which is open on the surface opposite to the projecting plate 14 side, at a position corresponding to each conduit opening 20 of the design surface 18 of the projecting plate 14. Many are formed. If the thickness of the top coat layer 26 is too thin, the protective effect of the design surface 18 of the protruding plate 14 by the top coat layer 26 may be extremely insufficient. Therefore, the thickness of the top coat layer 26 is 100 μm. It is desirable that it be about the above.

  The sealer layer 22 is laminated directly on the design surface 18 of the projecting plate 14 and is positioned between the projecting plate 14 and the colored layer 24 and between the projecting plate 14 and the top coat layer 26. Thus, the sealer layer 22 prevents, for example, the colored paint forming the colored layer 24 from penetrating into the veneer 14 and the color on the design surface 18 of the veneer 14 colored with the colored layer 24. The function of preventing the occurrence of unevenness and the role of increasing the adhesion between the colored layer 24 and the topcoat layer 26 with respect to the design surface 18 of the protruding plate 14 can be sufficiently achieved.

  The sealer layer 22 has a thickness that does not fill a large number of conduit openings 20 existing on the design surface 18 of the projecting plate 14, for example, an extremely thin thickness of about 10 μm or less, preferably about 5 μm or less. As a result, the top coat layer 26 has an inner recess 32 serving as a first recess, which is open on the surface opposite to the projecting plate 14 side, at a position corresponding to each conduit opening 20 of the design surface 18 of the projecting plate 14. Many are formed.

  In the present embodiment, in particular, such a sealer layer 22 is applied to the design surface 18 of the projecting plate 14 fixed to the substrate 12 with a thin thickness as described above, cellulose in the projecting plate 14, and the like. And a cured product of polyisocyanate produced by a curing reaction with moisture contained in or adsorbed on the design surface 18 of the veneer plate 14.

That is, here, a curing reaction as shown in the following chemical formula 1 is performed between a part of the polyisocyanate applied to the design surface 18 of the veneer 14 and a component having a hydroxyl group such as cellulose in the veneer 14. As a result, polyurethane, which is a cured product of polyisocyanate, is produced.

Further, among the polyisocyanates applied to the design surface 18 of the projecting plate 14, all or a part of the polyisocyanate other than those used for the production of polyurethane, moisture contained in the projecting plate 14, A curing reaction as shown in the following chemical formula 2 is induced between the water adhering to or adsorbed on the design surface 18 and polyurea, which is a cured product of polyisocyanate, is generated.

  Thus, the sealer layer 22 is made of a polyisocyanate containing polyurethane produced by sharing a hydroxyl group with cellulose or the like in the veneer 14 and polyurea produced by a curing reaction with moisture in the veneer 14 or on the design surface 18. It is a cured product, and is composed of a colorless and transparent resin layer (coating film) in which such polyurethane and polyurea are chemically bonded. Thus, the sealer layer 22 has a soft reactant, unlike a conventional sealer layer made of a cured product obtained by curing a mixture of a polyol main component and a polyisocyanate curing agent, for example. It is formed with sufficiently high hardness.

  In addition, the kind of polyisocyanate which forms the sealer layer 22 as a cured product of such polyisocyanate is not particularly limited. For example, a known polyisocyanate such as tolylene diisocyanate (TDI) or diphenylmethane diisocyanate (MDI) is used. The isocyanates can be used alone or in combination.

  By the way, when manufacturing the wooden decorative board 10 having such a structure, the operation is advanced according to the following procedure.

  First, the base material 12 and the protruding plate 14 are prepared. For example, the base material 12 is formed by performing known injection molding using the resin material previously exemplified as the forming material of the base material 12, so that the base material 12 has a shape corresponding to the overall shape of the target wood decorative board 10. It is prepared by molding in

  Further, as described above, the protruding plate 14 is prepared by being cut out from a predetermined piece of wood with a small thickness so that a desired grain appears on the design surface 18 and a large number of conduit openings 20 exist. The The protruding plate 14 is subjected to a drying process after being cut out from predetermined wood. Moreover, in order to prevent the generation | occurrence | production of the bubble after this adhering to the veneer 14 etc. which are mentioned later, after this drying process, under pressure reduction or pressurization, phenol resin, melamine resin, diallyl phthalate resin, urethane resin, An impregnation treatment for impregnating a resin such as a silicone resin is performed as necessary.

  Next, as shown in FIG. 3, after applying a known adhesive such as a urethane-based adhesive to one surface in the thickness direction of the base material 12, the projecting plate 14 is opposite to the design surface 18. The adhesive is hardened in a state of being overlapped on the surface. Thus, the adhesive layer 16 is formed, and the protruding plate 14 is fixed to the base material 12 on the surface opposite to the design surface 18.

  Subsequently, as shown in FIG. 4, the polyisocyanate 34 is placed on the design surface 18 of the protruding plate 14 fixed to the base material 12 so as not to fill a large number of conduit openings 20 existing on the design surface 18 (blocking). Apply to a thickness that is less than the depth of the conduit opening 20. Thereafter, the polyisocyanate 34 that is allowed to stand at room temperature for a predetermined time and applied to the design surface 18, a component having a hydroxyl group such as cellulose in the veneer 14, moisture contained in the veneer 14, or the design surface of the veneer 14 A polyurethane or polyurea, which is a cured product of the polyisocyanate 34, is generated by inducing a curing reaction with moisture adhering to or adsorbed on the substrate 18.

  As a result, as shown in FIG. 5, a sealer layer 22 made of a resin layer in which polyurethane and polyurea are chemically bonded is laminated on the design surface 18 of the protruding plate 14. That is, the sealer layer 22 having a sufficiently high hardness is formed by open pore coating. At the same time, by covering the inner surfaces of the numerous conduit openings 20 existing on the design surface 18 of the projecting plate 14 with a part of the sealer layer 22, the side opposite to the projecting plate 14 side of the sealer layer 22 is provided. The inner recesses 32 are respectively formed at the formation positions of the respective conduit openings 20 on the surface.

  Thereafter, as shown in FIG. 5, for example, a colored paint having a brown color or the like is formed on the surface of the sealer layer 22 on the side opposite to the protruding plate 14 side so as to correspond to the numerous conduit openings 20. The inner recess 32 is applied with a thickness smaller than the depth of the inner recess 32 so as not to fill (close) the inner recess 32. As a result, the colored layer 24 is laminated on the surface of the sealer layer 22 opposite to the protruding plate 14 side. That is, the colored layer 24 is formed by open pore painting. At the same time, by covering the inner surface of each inner recess 32 with a part of the colored layer 24, each inner recess 32 (each conduit opening portion) on the surface opposite to the sealer layer 22 side of the colored layer 24 is covered. The intermediate recesses 28 are respectively formed at the positions 20).

  Next, the clear coating material exemplified above is filled in the surface of the colored layer 24 thus formed opposite to the sealer layer 22 side, and a large number of intermediate recesses 28 formed corresponding to the large number of conduit openings 20 are filled. It is applied with a thickness smaller than the depth of the intermediate recess 28 so as not to be blocked (so as not to be blocked). As a result, a clear coating film is formed on the surface of the colored layer 24 opposite to the sealer layer 22 side, and thus the top coat layer 26 is laminated and formed with this clear coating film. That is, the top coat layer 26 is formed by open pore painting. At the same time, by covering the inner surface of each intermediate recess 28 with a part of the top coat layer 26, each intermediate recess 28 (each conduit on the surface of the top coat layer 26 opposite to the colored layer 24 side). The outer recesses 30 are respectively formed at the positions where the openings 20) are formed.

  Thus, as shown in FIG. 1, a wooden material in which a sealer layer 22, a colored layer 24, and a topcoat layer 26 are laminated in that order on the design surface 18 of the protruding plate 14 fixed to the substrate 12. The decorative board 10 is obtained.

  As described above, in the wood decorative board 10 of the present embodiment, the sealer layer 22, the colored layer 24, and the top coat layer 26 are open pores with respect to the design surface 18 of the protruding board 14 fixed to the base material 12, respectively. An outer recess 30 corresponding to a number of conduit openings 20 existing on the design surface 18 of the projecting plate 14 is formed on the top coat layer 26 which is laminated by coating and gives the surface (design surface) of the wooden decorative board 10. Many are formed. Thereby, in such a wood decorative board 10, a deep shadow and a texture with unevenness can be obtained on the surface, and therefore, an even better design and a more natural and heavy wood texture are effective. Can be demonstrated.

  In the present embodiment, in particular, the top coat layer 26 is formed by open pore coating, so that the thickness is reduced and the hardness is relatively lower than that of the conventional top coat layer. However, a sealer layer 22 having a sufficiently high hardness is formed between the top coat layer 26 and the design surface 18 of the protruding plate 14. As a result, not only the top coat layer 26 but also the sealer layer 22 can sufficiently fulfill the role of protecting the surface of the wooden decorative board 10. As a result, due to the cooperative action of the top coat layer 26 and the sealer layer 22, damage to the design surface 18 of the projecting plate 14 can be extremely effectively prevented.

  Therefore, in the wooden decorative board 10 of the present embodiment, high design and natural and heavy wood texture can be more stably exhibited over a longer period.

  Further, in the wooden decorative board 10, the sealer layer 22 is formed by simply applying polyisocyanate to the design surface 18 of the projecting board 14 fixed to the base material 12. Compared to the case where the sealer layer is formed of a cured product of polyol and polyisocyanate, which is produced by applying a main agent and a polyisocyanate curing agent to the design surface 18 of the veneer 14, the sealer layer 22 is It can be formed very simply and at low cost.

  Furthermore, in this embodiment, the polyisocyanate applied to the design surface 18 of the veneer 14 is a component having a hydroxyl group such as cellulose in the veneer 14, moisture contained in the veneer 14, or the design surface 18 of the veneer 14. The sealer layer 22 is formed by a cured product of polyisocyanate generated by causing a curing reaction with adhering or adsorbed moisture. Therefore, it can be avoided as much as possible that the polyisocyanate as the material for forming the sealer layer 22 is cured before being applied to the design surface 18 of the veneer 14. On the other hand, a mixture of polyol and polyisocyanate, which has been conventionally used as a material for forming a sealer layer, is cured from the time when the polyol and polyisocyanate are mixed before being applied to the design surface 18 of the veneer 14. Is made to progress.

  Therefore, in the wood decorative board 10 of the present embodiment, a sealer layer made of a cured product of the polyol and polyisocyanate is formed by applying a mixture of polyol and polyisocyanate to the design surface 18 of the veneer 14. Compared to the conventional product, it is very easy to handle the sealer layer forming material when forming the sealer layer 22. Thereby, the improvement of the manufacturability of the wooden decorative board 10 can be effectively achieved.

  In addition, in the woody decorative board 10 of the present embodiment, the colored colored layer 24 is laminated on the design surface 18 of the projecting board 14 via the colorless and transparent sealer layer 22. The design surface 18, that is, the surface of the decorative board 10 is colored in a desired color, so that more excellent design properties can be exhibited.

  The exemplary embodiments of the present invention have been described in detail above. However, these are merely examples, and the present invention is interpreted in a limited manner by specific descriptions according to such embodiments. It should be understood that it is not done.

  For example, in the above-described embodiment, the protruding plate 14 is directly fixed to the base material 12 on the back surface opposite to the design surface 18 side. For example, as illustrated in FIG. The backing layer 36 may be adhered to the back surface opposite to the design surface 18, and the protruding plate 14 may be fixed to the base material 12 through the backing layer 36.

  As the backing layer 36, generally, paper such as kraft paper or resin-impregnated paper having a thickness of about 0.1 to 0.2 mm, fabric such as woven fabric or nonwoven fabric, or resin film or wire mesh is appropriately used. Can be used. By fixing such a backing layer 36 to the back surface of the veneer plate 14, damage or the like in the conveying process of the veneer plate 14 can be advantageously prevented, and after the veneering board 10 is manufactured, the veneer plate 14 is dried and broken. It is also possible to effectively prevent the wavy deformation.

  Moreover, in the said embodiment, although the colored layer 24 was comprised by the coating film formed on the sealer layer 22, for example, a colored resin film is affixed on the sealer layer 22, and this colored resin film is attached. In this case, the colored layer 24 may be formed. In addition, even when forming the colored layer 24 with a resin film, it is necessary to form the intermediate | middle recessed part 28 in the surface of this resin film. The colored layer 24 is not essential in the present invention.

  In addition, although not enumerated one by one, the present invention can be carried out in a mode to which various changes, modifications, improvements, etc. are added based on the knowledge of those skilled in the art. It goes without saying that all are included in the scope of the present invention without departing from the spirit of the present invention.

  Hereinafter, representative examples of the present invention will be shown to clarify the present invention more specifically, but the present invention is not limited by the description of such examples. It goes without saying.

  First, injection molding using an ABS resin was performed to prepare two base materials having a rectangular flat plate shape of length × width × thickness of 100 mm × 70 mm × 3 mm. Also, on the other hand, slice the Obancoal material with a thickness of 0.3 mm so that the desired grain such as planks, squares and squares appears, and there are many conduit openings on the surface. Two flat plate materials were obtained. Then, these two flat plates were prepared as projecting plates.

  Next, after applying urethane adhesive with a thickness of 15 μm or more on one surface in the thickness direction of each of the two substrates, the previously prepared protruding plates are overlapped one by one. Adhered (fixed). As a result, the projecting plate is bonded to the base material, and the surface opposite to the base material side of the projecting plate is a design surface, and a plurality of conduit openings are present on the design surface. A joined body was obtained.

  Thereafter, one of the two bonded bodies was used, and a commercially available MDI as a polyisocyanate was applied to a thickness of 10 μm on the design surface of the veneer in the single bonded body. Then, a curing reaction is induced between the MDI and a component having a hydroxyl group such as cellulose in the veneer, moisture contained in the veneer, or moisture adhering to or adsorbed on the design surface of the veneer. A cured product of polyisocyanate was produced. Thus, a sealer layer made of a cured product of polyisocyanate was laminated on the design surface of the veneer. Then, the sealer layer was polished to make the sealer layer 5 μm thick.

  Next, a commercially available brown paint was applied in a thickness of 25 μm on the surface of the sealer layer opposite to the protruding plate side to form a colored layer. Thereafter, a commercially available acrylic resin was applied to the colored layer with a thickness of 100 μm to form a topcoat layer. Thus, a wood decorative board (example of the present invention) having a structure according to the present invention, in which the sealer layer was made of a cured product with polyisocyanate was obtained.

  Next, a mixture obtained by mixing a main component (polyol) and a curing agent (polyisocyanate) of a commercially available two-component urethane sealer on the design surface of the veneer in the single bonded body using the remaining single bonded body. Was applied in a thickness of 10 μm. And this mixture was hardened and the hardened | cured material of a polyol and polyisocyanate was produced | generated. Thus, a sealer layer made of a cured product of polyol and polyisocyanate was laminated on the design surface of the veneer. Thereafter, the sealer layer was polished to make the sealer layer 5 μm thick.

  Next, the colored layer and the top coat layer were laminated on the sealer layer in the same manner as the colored layer and top coat layer forming step in the wood decorative board of the present invention. As a result, a wooden decorative board (comparative example) having a conventional structure, in which the sealer layer was formed of a cured product of polyol and polyisocyanate was obtained.

  And the hardness of the surface of each wooden decorative board was investigated based on the pencil scratch test prescribed | regulated to JISK5400 using the wooden decorative board of this invention example obtained in this way, and the wooden decorative board of a comparative example. As a result, the pencil hardness of the surface of the wooden decorative board of the present invention was 5B to 6B. On the other hand, the pencil hardness of the surface of the wood decorative board of the comparative example was 7B or less, which was clearly smaller than the pencil hardness of the surface of the wood decorative board of the present invention.

  Therefore, the wooden decorative board having the structure according to the present invention has a surface hardness higher than that of the conventional wooden decorative board, and therefore the design surface of the veneer is sufficiently protected, and the design surface is advantageously damaged. It can be clearly recognized that it can be prevented.

It is a partial longitudinal cross-section explanatory drawing of the wooden decorative board which has a structure according to this invention. It is the elements on larger scale in FIG. It is explanatory drawing which shows an example of the process implemented when manufacturing a wooden decorative board according to this invention method, Comprising: The state which stuck the veneer to the base material is shown. It is explanatory drawing which shows the process example implemented following the process shown by FIG. 3, Comprising: The state which apply | coated polyisocyanate is shown on the design surface of a veneer. It is explanatory drawing which shows the process example implemented following the process shown by FIG. 4, Comprising: The state which laminated | stacked the colored layer on the sealer layer formed in the design surface of a protrusion board is shown. It is a figure corresponding to FIG. 1 which shows another example of the wooden decorative board which has a structure according to this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Wood decorative board 12 Base material 14 Veneer board 16 Adhesive layer 18 Design surface 20 Conduit opening part 22 Sealer layer 24 Colored layer 26 Topcoat layer 28 Middle recessed part 30 Outer recessed part 32 Inner recessed part 34 Polyisocyanate 36 Backing layer

Claims (4)

A wooden veneer having a design surface with an open conduit is fixed on a hard substrate on the surface opposite to the design surface, and the design surface of the veneer is protected to protect the design surface In the wooden decorative board formed by laminating the top coat layer composed of a simple coating layer via the sealer layer,
The top coat layer and the sealer layer are laminated and formed on the design surface of the protruding plate with a thickness that does not fill the opening of the conduit on the design surface, and the top coat layer and the sealer layer In addition, a recess corresponding to the opening of the conduit is provided, and the sealer layer is cured by a curing reaction between a component having a hydroxyl group in the veneer and moisture of the veneer and a polyisocyanate. A wooden decorative board characterized by being formed of a material.   The wooden decorative board according to claim 1, wherein a colored layer for coloring the design surface of the protruding board is further formed between the sealer layer and the topcoat layer. Preparing a hard substrate;
A step of fixing a wooden veneer having a design surface in which a conduit is opened on the base material on a surface opposite to the design surface;
A polyisocyanate is applied on the design surface of the veneer so as not to fill the opening of the conduit on the design surface, and the polyisocyanate is coated with a component having a hydroxyl group in the veneer and moisture of the veneer. And a cured reaction product of the polyisocyanate to form a cured product of the polyisocyanate by laminating and forming a sealer layer made of the cured product of the polyisocyanate on the design surface of the projecting plate. Forming a first recess corresponding to the opening of the conduit in the design surface of the protruding plate on the opposite surface;
By applying a clear paint on the surface of the sealer layer opposite to the protruding plate side, with a thickness not filling the first recess formed on the surface, to form a transparent coating film, A top coat layer that protects the design surface of the veneer made of the transparent coating film is laminated on the sealer layer, and the sealer is formed on the surface of the top coat layer opposite to the sealer layer side. Forming a second recess corresponding to the first recess of the layer;
The manufacturing method of the wooden decorative board characterized by including. After the sealer layer is laminated on the design surface of the projecting plate, a colored layer for coloring the design surface of the projecting plate is formed on the surface opposite to the projecting plate side of the sealer layer, and then the By applying the clear paint to the surface of the colored layer opposite to the sealer layer side to form the transparent coating film, the topcoat layer comprising the transparent coating film is formed on the sealer. 4. The method for manufacturing a woody decorative board according to claim 3, wherein the layer is laminated on the surface of the layer opposite to the protruding plate side via the colored layer.

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