JP2020163697A - Woody decorative plate and manufacturing method thereof - Google Patents

Abstract

To provide a woody decorative plate generating a new sense of beauty, whose three-dimensional effect and depth feeling are visually observed.SOLUTION: According to a woody decorative plate formed by laminating a layer made from a real wood sheet, and a clear layer in this order on a substrate made of a resin, the woody decorative plate is constituted by using one comprising countless voids including voids derived from a conduit tube of raw wood of the real wood sheet, that is open on a clear layer side surface, as a real wood sheet; and by forming a metal film made from an aggregate of metal particles into at least part of voids among the voids derived from the conduit tube of the raw wood in a form where no void inside is filled on a region of at least part of an inner void wall.SELECTED DRAWING: Figure 1

Description

The present invention relates to a wooden decorative board and a method for producing the same, and more particularly to a wooden decorative board preferably used as various interior parts of an automobile and a method capable of advantageously manufacturing such a decorative board.

Conventionally, for automobile interior parts such as dash panels, wooden decorative boards made of various types of wood have been used in order to give the parts a high-class feel. As such a wooden decorative board, those having various configurations have been proposed and used, and for example, the structure as shown in FIGS. 1 to 3 of Patent Document 1 (Japanese Unexamined Patent Publication No. 2002-347007). A wooden veneer that exhibits is known.

Further, in Patent Document 2 (Japanese Patent Laid-Open No. 2-3385), the appearance of the board surface has both a heavy feeling and a splendid feeling, and as a decorative board material utilizing the characteristics of wood, the grain of the wood base board forming the surface layer. A large amount of colored powder having a metallic luster is inserted and fixed in the cut end of the conduit along the wood grain, and the surface of the main plate other than the wood grain has almost no colored powder, and the entire surface thereof is formed by a transparent resin layer. A decorative board material, which is characterized by being covered, is disclosed.

However, when the present inventor confirmed the decorative plate material disclosed in Patent Document 2, the decorative plate material disclosed therein was formed on another wood surface due to a large amount of colored powder having a metallic luster inserted into the cut end of the conduit. Although a metallic luster different from that of wood was observed, it was found that the wood had a poor sense of three-dimensionality and depth. Further, in recent years, in order to give a three-dimensional effect of wood to a wooden decorative board, a method of coloring a wood (main wood) sheet or a clear layer which is the outermost layer has been known, but the three-dimensional effect and depth of wood have been known. At present, the wooden veneer, which gives a feeling of being seen, has not yet been developed.

Japanese Unexamined Patent Publication No. 20002-347007 Special Fair 2-3385 Gazette

Here, the present invention has been made in the context of such circumstances, and the problem to be solved is that the same three-dimensional effect and depth as wood are observed, which is not found in the conventional products. The purpose is to provide a wooden veneer that creates a new aesthetic feeling. Another object of the present invention is to provide a method capable of advantageously producing a wooden decorative board having such excellent properties.

Then, in order to solve such a problem, the present invention makes a wooden decorative board in which a layer made of a genuine wood sheet and a clear layer are laminated and formed in this order on the surface of a resin base material. The wood sheet has innumerable voids including voids derived from the conduit of the raw wood of the main wood sheet, which are opened on the clear layer side, and among the voids derived from the conduit of the raw wood of the main wood sheet. It is characterized in that, in at least a part of the voids, a metal film made of an aggregate of metal particles is formed on at least a part of the inner wall of the voids in a form that does not fill the inside of the voids. The gist of this is a wooden veneer.

In such a wooden decorative board according to the present invention, preferably, the voids having the reflective portions are unevenly distributed on the main wood sheet, and the high gloss portion composed of the portions where the voids are densely present. It has a low-gloss portion composed of a portion where the voids are coarsely present.

On the other hand, the present invention is a method for producing a wooden decorative board in which a layer made of a main wood sheet and a clear layer are laminated and formed in this order on the surface of a resin base material. A liquid paint containing metal particles is sprayed or applied to the surface on which innumerable voids including voids derived from the conduit of the raw wood of the wood sheet are opened, and the liquid paint is derived from the conduit of the raw wood of the main wood sheet. The metal is allowed to flow into at least a part of the voids to be formed, and the metal particles in the liquid paint are adhered to at least a part of the inner wall of the voids, and then heat treatment is performed to obtain the metal. A method for producing a wooden decorative board, which comprises forming a metal film made of aggregates of particles on at least a part of the inner wall of the void in a form that does not fill the inside of the void. It is a summary.

In such a production method according to the present invention, the viscosity of the liquid coating material containing the metal particles is preferably 0.01 to 0.03 Pa · s.

As described above, in the wood veneer according to the present invention, as the main wood sheet, a sheet having innumerable voids including voids derived from the conduit of the raw wood that opens on the clear layer side is used, and also. In a form in which at least a part of the voids derived from the conduit of the raw wood is not filled with a metal film made of agglomerates of metal particles on at least a part of the inner wall of the void. It is formed. Therefore, the light entering from the clear layer side is effectively reflected by the metal film existing inside the voids described above, and thus the same three-dimensional effect and depth feeling as wood can be seen in the conventional product. It is a wooden veneer that creates a new beauty (glittering feeling). More specifically, since the wood sheet is derived from a natural object (raw wood), the shape of the voids derived from the conduit of the log is diverse, and on at least a part of the inner wall of such voids. Since the metal film is formed in a form that does not fill the voids, the direction of reflection of light that enters through the clear layer is random. Therefore, the wood-based decorative board of the present invention is glittering. It can give rise to a feeling.

Further, in the method for producing a wooden decorative board according to the present invention, it is possible to easily manufacture a wooden decorative board having the above-mentioned excellent characteristics.

It is a vertical cross-sectional explanatory view of the wooden decorative board according to this invention. FIG. 1 is a partially enlarged cross-sectional explanatory view of FIG. It is explanatory drawing which shows the process of forming a metal film in a void derived from a conduit.

The present invention will be described in detail below with reference to the drawings as appropriate. It should be understood that the accompanying drawings are partially exaggerated and schematically drawn in order to facilitate understanding of the characteristic parts of the present invention.

FIG. 1 is an explanatory view showing a cross section (longitudinal cross section) that appears when the wood decorative board 10 according to the present invention is cut in a plane parallel to the stacking direction of the layer made of the main wood sheet and the clear layer. , FIG. 1 is a partially enlarged explanatory view.

As is clear from FIGS. 1 and 2, the woody decorative board 10 of the present invention has a layer made of a real wood sheet 14 and a clear layer 16 on one surface of a resin base material 12 having a rectangular flat plate shape. And are formed by laminating from one surface (upper surface in FIG. 1) of the resin base material 12 in this order.

First, the resin substrate 12 in the present embodiment exhibits a rectangular flat plate shape, but the shape of the resin base material in the present invention is not limited to the rectangular flat plate shape, and the surface of the resin substrate 12 is made of wood. Any shape can be adopted as long as it can be formed by laminating a layer made of a sheet and a clear layer. Further, as the resin material constituting the resin substrate of the present invention, a material appropriately selected according to the use of the wooden decorative board and the like can be used. For example, when the wood veneer of the present invention is used as an interior part for an automobile, it is generally an ABS resin containing acrylic resin, ABS resin, polycarbonate / ABS resin, glass fiber, polypropylene resin, polyethylene resin, polyamide resin, etc. A resin base material is formed by using a polybutylene terephthalate resin, a noryl resin, or the like.

Further, the clear layer 16 formed for the purpose of protecting the main wood sheet 14 is formed by using a resin material having excellent transparency such as a polyester resin, similarly to the conventional wood decorative board. The thickness of such a clear layer 16 is appropriately determined according to the use of the wooden decorative board 10, and for example, when the wooden decorative board of the present invention is used as an interior part for an automobile. A clear layer having a thickness of about 0.5 to 5.0 mm is formed.

Then, in the wooden decorative board 10 according to the present invention, the main wood sheet 14 interposed between the resin base material 12 and the clear layer 16 opens on the clear layer 16 side, and the raw wood of the main wood sheet 14 is opened. It has innumerable voids including voids derived from the conduit, and in at least a part of the voids derived from the conduit of such raw wood, a metal film composed of agglomerates of metal particles is formed on the inner wall thereof. A major technical feature lies in the fact that it is formed on at least a part of the site in a form that does not fill the inside of the void. More specifically, as shown in FIGS. 1 and 2, in the wood sheet 14 of the wood decorative board 10 according to the present invention, among the innumerable voids opened on the clear layer 16 side, the book In the voids 18a to 18j derived from the conduit of the raw wood of the wood sheet 14, metal films 20a to 20j composed of aggregates of metal particles 22 are formed on the inner walls (side walls and bottom surface) of the voids 18a to 18j. It is formed in a form that does not fill the inside.

As described above, in the wood decorative board 10 according to the present invention, the surface of the main wood sheet 14 (the surface on the clear layer 16 side) is provided with voids having a metal film on the inner wall, and the clear layer is formed. The light transmitted through 16 is not only reflected on the surface of the wood sheet 14, but also effectively reflected on the surface of the metal film existing on the inner wall of the void. Therefore, the reflected light by the metal film causes the light to be reflected. It is a wooden veneer that gives a new sense of beauty (glitter) that is not found in conventional products, as well as a sense of three-dimensionality and depth similar to that of wood (main wood).

In the present invention, the metal film described above does not fill the inside of the voids in at least a part of the voids derived from the conduit of the raw wood (natural wood) which is the source of the main wood sheet. It is sufficient if it is formed in. That is, even if there are voids whose inside is filled with metal particles on the surface of the Motoki sheet on the clear layer side, as long as there are voids whose inside is not filled with metal particles. Due to the presence of voids whose interior is not filled with metal particles, a three-dimensional feeling and a sense of depth similar to those of wood can be seen, and a wooden decorative board that creates a new aesthetic feeling (glittering feeling) not found in conventional products. It becomes.

Further, as shown in FIG. 1, when the above-mentioned voids having a predetermined metal film are unevenly distributed on the surface of the genuine wood sheet (14) on the clear layer (16) side, the voids are densely distributed. In the existing part (the part where the voids 18d to 18h are present in FIG. 1), the part is compared with the roughly existing part (the part where the voids 18a to 18c are present and the part where the voids 18i and 18j are present in FIG. 1). As a result, the light transmitted through the clear layer is reflected more strongly. Therefore, in a wooden decorative board having a genuine wood sheet in which predetermined voids are unevenly distributed, a portion where such voids are densely present is recognized as a high-gloss portion, while a portion where such voids are present is recognized as a low-gloss portion. It will be recognized as a part, and it is a wooden veneer where a new beauty (glittering feeling) can be seen more effectively.

Here, the metal particles 22 constituting the metal films 20a to 20j are particles made of any conventionally known metal species as long as the metal film can be formed on the inner wall of the voids on the surface of the main wood sheet 14. Even if there is, it is possible to adopt it. Specifically, in addition to gold particles, silver particles and copper particles, particles made of various metal compounds and the like can be exemplified, but in the present invention, silver particles are advantageously used.

Further, if metal particles having an excessively large particle size are used, a metal film may not be formed, and the inside of the voids derived from the conduit may be filled. On the other hand, if the metal particles having a too small particle size are used, a film is formed. May be difficult. Therefore, the metal particles used in the present invention preferably have a particle diameter of about 3 to 20 nm.

On the other hand, the main wood sheet 14 is made of a flat plate material obtained by slicing various natural woods (raw wood) having beautiful grain so that the desired grain such as grain, grain, and grain appears. The natural wood to which such a real wood sheet 14 is given can be appropriately selected depending on the use of the finally obtained wood veneer 10, and for example, bird's eye maple, curly maple, claro walnut, and the like. Ovankor, bamboo, agathis, etc. can be mentioned. The thickness of the genuine wood sheet 14 is not particularly limited, but for example, when the wood decorative board 10 is used as an interior part for an automobile, the thickness is generally 0.1 to 0.5 mm. A degree of genuine wood sheet 14 is used.

Although one of the typical embodiments of the wooden decorative board according to the present invention has been described in detail above, it goes without saying that the wooden decorative board of the present invention is not limited to the above-described embodiment. ..

For example, it is possible to interpose a layer made of a non-woven fabric between the resin base material and the genuine wood sheet. By interposing a layer made of a non-woven fabric between the resin base material and the main wood sheet, it becomes easier to fix the main wood sheet on the resin base material. The non-woven fabric used in the present invention is not particularly limited, and any non-woven fabric that has been conventionally used for wooden decorative boards can be used. Further, the thickness can be set as appropriate according to the use of the wooden decorative board, as in the case of the conventional wooden decorative board. For example, when used as an interior part for an automobile, the thickness is 0.5. A non-woven fabric having a thickness of about 5.0 mm is advantageously used.

In addition, in order to exert a more excellent wood texture (including a three-dimensional effect and a sense of depth) in the wooden decorative board (10), a pigment or paint is used between the main wood sheet (14) and the clear layer (16). It is also possible to provide a colored layer made of a coating film.

Further, in the above-described embodiment, the metal film (20a to 20j) is formed over the entire surface (side wall and bottom surface) of the inner wall in the voids (18a to 18j), but in the present invention, the metal film is a log. It suffices if it is formed on at least a part of the inner wall of the void derived from the conduit. Therefore, for example, a metal film made of metal particles may be formed only on the side wall that is grasped (recognized) from the clear layer side in the void.

By the way, the wooden decorative board according to the present invention can be advantageously manufactured, for example, by following the manufacturing method shown below.

First, it is a laminated body in which a genuine wood sheet is laminated on the surface of a resin base material, and is formed on the surface of the main wood sheet (the surface opposite to the resin base material side) and as a conduit of the raw wood of the main wood sheet. The one in which the derived void is open is produced. As a method for producing such a laminate, 1) a method of integrating a resin base material and a main wood sheet prepared in advance by bonding them together using various known adhesives, and 2) a method of integrating the main wood in a molding cavity. Mold matching is performed with the sheet fixed, and a liquid synthetic resin material is injected into the molded mold (inside the molding cavity) in the molded state to perform insert molding. A method of obtaining an integral product with a wooden sheet can be exemplified.

In the case of producing a wooden decorative board in which a non-woven fabric is interposed between a resin base material and a genuine wood sheet, 1) a resin base material, a non-woven fabric and a genuine wood sheet prepared in advance are known. A method of integrating by bonding with various adhesives, and 2) a state in which the main wood sheet and non-woven fabric that have been previously bonded and fixed are molded and molded while being fixed in the molding cavity. Examples thereof include a method of injecting a liquid synthetic resin material into the molding die (inside the molding cavity) and performing insert molding to obtain an integral product of the resin base material, the non-woven fabric, and the Motoki sheet.

Next, a liquid paint containing metal particles is sprayed onto the surface of the Motoki sheet according to a known technique such as a spray coating method. FIG. 3 shows the process from the start of spraying a liquid paint containing metal particles onto the surface of a wood sheet according to the present invention to the formation of a predetermined metal film in the voids derived from the conduit. It is explanatory drawing which shows the cross section which is schematically and partially enlarged. Focusing on the void 18a as shown in FIG. 3, when the liquid paint containing the metal particles 22 is sprayed onto the surface of the main wood sheet 14 from the blowing nozzle 24 of the spray coating machine (not shown), The liquid paint adhering to the main wood sheet 14 enters the voids 18a together with the metal particles 22 (see FIG. 3A). From the start of spraying the liquid paint to the elapse of a predetermined time from the end of spraying, the liquid paint continues to enter the voids 18a, and due to the intrusion of the liquid paint, the metal particles 22 enter the inner wall of the voids 18a. A layer 26 of a liquid coating material containing a large amount of the above is formed (see FIG. 3B). Then, by heating and impressing the layer 26 of the liquid paint, a metal film 20a made of an aggregate of the metal particles 22 is formed on the standing surface portion grasped from the spraying side in the void 18a. A method of applying a liquid paint containing metal particles instead of spraying can also be advantageously adopted.

Here, the liquid coating material containing the metal particles is effectively allowed to enter the voids derived from the conduit, and at least a part of the voids is filled with the metal film of the present invention to fill the inside of the voids. In order to form in an inexhaustible form, the viscosity of the liquid paint, the content (content ratio) of the metal particles contained in the liquid paint, and various conditions for spraying (spraying amount per unit time, spraying) It is necessary to appropriately determine the thickness, etc.) according to the type of raw wood that composes the main wood sheet, the state of the voids existing on the sheet surface, and the design of the target wooden decorative board. Will be done. In particular, if the viscosity of the liquid paint is too high, the liquid paint and metal particles may not effectively enter the voids, and if the viscosity of the liquid paint is too low, there are too many solvent components in the voids. In the present invention, the liquid paint (including metal particles) sprayed on the surface of the wood sheet has a viscosity in the range of 0.01 to 0.03 Pa · s because the metal particles may not effectively invade the surface. What is inside is used advantageously.

Further, in the production method according to the present invention, as the liquid coating material containing metal particles, a liquid coating material capable of forming a plating-like coating film, which has been conventionally referred to as a coating material for plating film conditioning and the like, is advantageous. used. In the present invention, the liquid coating material containing such metal particles can be used as it is after purchase, and it is also possible to use a liquid coating material whose viscosity has been adjusted by adding a predetermined organic solvent. As the organic solvent used when adjusting the viscosity of the liquid paint, a solvent suitable for the liquid paint is selected from known ones such as an alcohol solvent, an ester solvent, a ketone solvent and an ether solvent. Can be used. As a commercial product of a liquid paint containing metal particles that can be used in the present invention, GRANZCOAT (product name) manufactured by FECT Co., Ltd. can be exemplified. Some commercially available liquid paints containing metal particles are coated with various resins for the purpose of improving dispersibility in the paint. In the present invention, even a liquid coating material containing metal particles coated with such a resin can be used as long as it does not impair the object of the present invention.

Further, as shown in FIG. 3B, the resin base material (not shown) and the Motoki sheet 14 on which the layer 26 of the liquid paint containing a large amount of metal particles 20 is formed on the inner wall of the void 18a are heated. By drying and volatilizing the solvent in the liquid paint, a metal film 20a made of agglomerates of metal particles 22 is formed in the voids 18a. Such heating and drying are appropriately determined depending on the type and amount of the organic solvent contained in the liquid coating material, but are generally heated at a temperature of about 70 to 150 ° C. for about 30 minutes to 1 hour. It is carried out by doing.

Then, after forming the metal film as described above, the present invention is formed by forming a clear layer 16 made of a transparent resin such as a polyester resin on the Motoki sheet 14 according to various conventionally known methods. A wooden veneer 10 according to the above is advantageously obtained. For example, when the clear layer 16 is formed according to the coating method, the coating film formed by the coating is heated at a temperature of about 70 to 100 ° C. for about 30 minutes to 1 hour to dry and cure the coating film. As a result, the clear layer 16 is formed.

Here, the following confirmation experiment was carried out in order to confirm that the metal film of the present invention was formed in the voids derived from the conduit by spraying the liquid paint containing the metal particles described above.

A commercially available liquid paint (containing silver particles, product name: GRANZCOAT) and ether-based propylene glycol and ethanol were mixed as an organic solvent at a ratio of 1: 1 (weight ratio). The liquid paint and the organic solvent were mixed and stirred at a ratio of 1: 1 (weight ratio) to prepare a paint for spraying. On the other hand, a real wood sheet (raw wood: bird's eye maple) was adhesively fixed to the surface of an acrylic resin base material having a rectangular plate shape (100 mm × 100 mm) using a known adhesive.

The surface of the Motoki sheet on the acrylic resin base material was spray-painted with the spray paint prepared above using a spray coating machine. The spray coating was carried out so that the thickness of the coating film on the Motoki sheet was 0.2 μm or less. The solvent in the spray paint was volatilized by leaving it at room temperature for 5 minutes from the end of spraying and then heating it at 100 ° C. for 40 minutes.

When the laminate obtained from the above was cut in the lamination direction and the cross section thereof was observed with an electron microscope, a metal film composed of aggregates of metal particles (silver particles) was found in the voids derived from the conduit. It is recognized that it is formed in a form that does not fill the inside of the gap (in other words, on the standing surface portion grasped (viewed) from the spraying side on the side wall of the gap) on at least a part of the part of the gap. It was.

As described above, in the wood decorative board according to the present invention, a metal film made of agglomerates of metal particles is formed in at least a part of the voids derived from the conduit of the raw wood on the surface of the genuine wood sheet. Since the side wall is formed on the standing surface portion grasped from the clear layer side in a form that does not fill the inside of the void, the light entering from the clear layer side is effective by the metal film existing inside the void. As a result, the three-dimensional feeling and depth feeling similar to those of wood are recognized, and it is a wooden decorative board that gives a new aesthetic feeling (glittering feeling) not found in conventional products. In addition, the method for producing a wooden decorative board according to the present invention can advantageously produce a wooden decorative board exhibiting such excellent characteristics.

Although the present invention has been described in detail above, the present invention makes various changes, modifications, improvements, etc. based on the knowledge of those skilled in the art as long as it does not deviate from the gist of the present invention, in addition to the above-mentioned specific description. It should be understood that it can be added.

10 Wood veneer 12 Resin base material 14 Motoki sheet 16 Clear layer 18a-18j Void 20a-20j Metal film 22 Metal particles

Claims (4)

On the surface of the resin base material, a layer made of a real wood sheet and a clear layer are laminated and formed in this order to form a wooden decorative board.
The main wood sheet has innumerable voids including voids derived from the conduit of the raw wood of the main wood sheet that opens on the clear layer side.
In at least a part of the voids derived from the conduit of the raw wood of the main wood sheet, a metal film made of agglomerates of metal particles forms the inside of the voids on at least a part of the inner wall of the voids. Formed in an unfilled form,
A wooden veneer that is characterized by that. The voids having the metal film are unevenly distributed on the Motoki sheet, and have a high-gloss portion formed of a portion where the voids are densely present and a low-gloss portion formed of a portion where the voids are coarsely present. The wooden decorative board according to claim 1. A method for manufacturing a wooden decorative board, in which a layer made of a genuine wood sheet and a clear layer are laminated and formed in this order on the surface of a resin base material, is used.
A liquid paint containing metal particles is sprayed or applied to the surface of the main wood sheet in which innumerable voids including voids derived from the conduit of the raw wood of the main wood sheet are opened, and the liquid paint is applied to the book. The metal particles in the liquid paint are allowed to flow into at least a part of the voids derived from the conduit of the raw wood of the wood sheet, and the metal particles in the liquid paint are attached to at least a part of the inner wall of the voids, and then heated. By applying the treatment, a metal film made of agglomerates of the metal particles is formed on at least a part of the inner wall of the void in a form that does not fill the inside of the void. How to make a board. The method for producing a wood-based decorative board according to claim 3, wherein the liquid coating material containing the metal particles has a viscosity of 0.01 to 0.03 Pa · s.

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