JP4792237B2 - Production method of wood - Google Patents

Description

  The present invention relates to a method of manufacturing a wood material in which a base material having a decorative veneer is bent to form a plurality of surfaces.

For building materials such as counters, stair treads, frame materials, and furniture such as table tops, baskets, and closets, luxury products are made of solid wood and engraved and painted in a manner close to hand finishing. Solid materials are all made of a single plate, so there is no need to stick cosmetics.
On the other hand, various methods have been studied so that cheap popular products are convenient for mass production in factories. However, in cheap materials such as plywood and MDF (medium density fiberboard) used as a base material. Even if a veneer veneer is attached to the front, it cannot be applied to the side at the same time. Therefore, a method has been used in which a decorative veneer is attached to the side as shown below to make it look like a solid material.

  The first method is to apply a decorative veneer or decorative sheet on a base material such as plywood or MDF, and attach a small veneer or a decorative tape to the wood ends or the end of the wood. It is a method for obtaining a cosmetic surface. This is because the conventional single-side processing / painting line can be diverted to the process of sticking a decorative veneer or decorative sheet on the base material, which enables uniform and mass production at high speeds. Since a material different from a single veneer or a decorative tape and a decorative veneer or decorative sheet on a base material is used, there are problems such as gap generation, peeling, and color / finishing mismatch.

  The second method is a method in which a decorative sheet is stuck on a base material that has been subjected to shape processing in advance using an apparatus such as a laminator or a vacuum press. This is because there are no problems such as gap generation, peeling, and color / finishing inconsistencies that are likely to occur in the first method, but there are many restrictions on the decorative sheet to be used, the device also requires a special laminator, and the line speed during production is high. There was a problem of being slow.

  On the other hand, a method widely used in recent years is necessary after attaching a decorative veneer obtained by thinly slicing a name tree or a plastic decorative sheet printed with various patterns on a base material such as plywood or MDF. According to this method, coating is performed and a bending process is performed so as to form a curved surface after engraving a large number of V-shaped grooves or comb-shaped grooves on the back surface (see, for example, Patent Documents 1 to 3). . According to this method, it is possible to easily produce members such as a frame material and a counter having two to three decorative surfaces.

6 and 7 are process diagrams showing a conventional example of bending using the V-shaped groove.
As shown in FIG. 6, the decorative veneer 2 is first attached to the substrate 1 in the attaching step 100. Further, the surface of the decorative veneer 2 is coated by the undercoating process 200, the intermediate coating process 300, the sander process 400, and the overcoating process 500. Then, the V-shaped groove 6 is formed on the back surface of the substrate 1 in the V-cut process 600.
Next, as shown in FIG. 7, in the bending step 700, the base material 1 is bent so as to fill the V-shaped groove 6 around the V-shaped groove 6, and bending is performed. Note that an adhesive is applied to the bent joint portion 7 of the V-shaped groove 6.
As described above, a plurality of surfaces can be formed.

On the other hand, since a wooden decorative veneer is likely to be cracked when it is curved, a wooden decorative sheet (see, for example, Patent Documents 4 and 5) in which a hot-melt resin is infiltrated and solidified into the thin plate in advance. An invention relating to a decorative veneer plate (for example, see Patent Document 6) in which a hot melt sheet is fused and integrated with a thin plate is disclosed. Moreover, what stuck the plastic sheet on the decorative veneer beforehand (for example, refer patent document 7) is also disclosed.
JP 53-52123 A JP-A-53-64289 JP 54-97677 A JP 2002-283501 A Japanese Patent Application Laid-Open No. 2004-268496 Japanese Utility Model Publication No. 57-125301 JP 10-138403 A

  However, according to the inventions described in Patent Documents 1 to 7, the following problems occur when bending is performed so as to form a plurality of surfaces.

(1) Cracks are likely to occur during bending.
As a decorative veneer, a dry veneer is used in normal use, but a wet veneer is flexible and easily bent, whereas a dry veneer is hard and brittle, and easily cracks during bending. Further, at the stage of bending after processing the V-shaped groove, a tensile force is applied to the decorative veneer as a whole, and there is a risk of breakage. Once a crack occurred, it was difficult to repair only the curved surface, and the crack gradually spread from the first cracked part.
If it demonstrates in said conventional example, as shown in FIG. 7, in the corner | angular part 8 after a bending process, a crack will arise in the decorative veneer 2, the undercoat layer 3, the intermediate coating layer 4, and the overcoat layer 5. FIG.

(2) Productivity is poor.
To prevent cracking, the line speed (production speed) can be reduced and bending can be performed gradually to suppress cracking to some extent, but this is a feature that enables efficient production in a bent flat state. Will be killed. In addition, when a crack occurs, it is necessary to repair it manually. However, it requires skill and effort, and there is a risk that the crack will recur at a later date from the repaired part.
In addition, when bending, a weak adhesive tape (curing tape) is attached to the part to be bent and removed when the bending is completed, but the tape needs to be attached and removed. It took a lot of garbage and was not suitable for mass production.
Further, according to the inventions described in Patent Documents 4 to 6, although there is an effect of preventing cracking of the decorative veneer during bending, it is necessary to process the decorative veneer itself in advance, and it is necessary to prepare in advance. It took time and effort, leading to a decline in productivity.

(3) The finished feeling is lowered.
In addition, as in the invention described in Patent Document 7, it may be possible to stick a plastic sheet on a decorative veneer in advance. However, the plastic sheet is thicker than the coating, and the wood texture is lost as a finished state. And it seemed to be a plastic pack, and it had the drawback of exhibiting the feeling of plastic colder than wood.

  Therefore, the present invention is for solving the above-mentioned conventional problems, in the case of forming a plurality of surfaces by bending the base material pasted with a decorative plate, preventing cracking, improving productivity, The present invention provides a method for manufacturing a wood material that can simultaneously improve the finish feeling.

In order to solve the above-mentioned conventional problems, the method for producing a woody material according to claim 1 is characterized in that a decorative veneer (2) is adhered to the surface of a base material (1) and the veneer veneer (2). After coating (3,4,5) on the surface of the substrate, a V-shaped groove (6) is formed on the back surface of the substrate (1), and the V-shaped groove ( 6) In the manufacturing method of the wood material to bend so as to fill, the hot melt adhesive (10) is further applied to the surface of the decorative veneer (2) at the time of coating the surface of the decorative veneer (2). It is applied to at least a portion that becomes a corner (8) after bending .

  The invention according to claim 2 is characterized in that, in the invention according to claim 1, the hot melt adhesive (10) is urethane-based or EVA (ethylene vinyl acetate copolymer) -based, and is soft. To do.

  The invention according to claim 3 is the invention according to claim 1 or claim 2, wherein the hot melt adhesive (10) is applied to the corner portion (after bending) of the surface of the decorative veneer (2). 8) It is characterized by being applied only to the part to be.

  Further, the invention according to claim 4 is the invention according to any one of claims 1 to 3, wherein the coating process of the surface of the decorative veneer (2) includes a plurality of application processes (200, 300, 500), and the hot melt adhesive (10) is applied immediately before the final application step (500) among the plurality of application steps (200, 300, 500).

  Further, the invention according to claim 5 is the invention according to any one of claims 1 to 3, wherein the coating process of the surface of the decorative veneer (2) includes a plurality of application processes (200, 300, 500), and the hot melt adhesive (10) is applied immediately after the final application step (500) among the plurality of application steps (200, 300, 500).

According to a sixth aspect of the present invention, there is provided a method for producing a wood material, comprising: coating a solid material surface; forming a V-shaped groove on the back surface of the solid material; In the method of manufacturing a wooden material that is bent so as to fill a groove, a hot melt adhesive is further applied to at least a portion of the solid material that becomes a corner portion after the bending when the surface of the solid material is coated. It is characterized by that.

In the invention according to claim 7, the veneer veneer (2) is adhered to the surface of the base material (1), and the surface of the veneer veneer (2) is coated (3, 4, 5). Thereafter, a V-shaped groove (6) is formed on the back surface of the base material (1), and the wooden material is produced by bending the V-shaped groove (6) around the V-shaped groove (6). The surface of the decorative veneer (2) is further coated with a UV paint on the surface of the decorative veneer (2) at least on the corners (8) after bending. To do.

  The symbols in parentheses indicate the best mode for carrying out the invention and the corresponding elements or the corresponding matters described in the drawings.

According to the first aspect of the present invention, at the time of coating the surface of the decorative veneer adhered to the base material, the hot melt adhesive is further applied to the corner portion of the surface of the decorative veneer at least after being bent. Since it is applied, the hot melt adhesive to which the tensile force to the decorative veneer during bending is applied is suppressed from the outside, and the decorative veneer can be prevented from cracking.
In addition, since the occurrence of cracks can be prevented, the line speed can be increased, and manual repair is not required, so that productivity can be greatly improved.
Since the application of the hot melt adhesive is performed at the time of painting the surface of the decorative veneer, it is not necessary to process the decorative veneer itself in advance.
Furthermore, there is no need to use a plastic sheet, and the finish is good.

  According to the invention described in claim 2, in addition to the effects of the invention described in claim 1, since a soft hot melt adhesive is used in urethane or EVA, the hot melt adhesive itself It also follows the bending and exerts an effect as if it was pressed with a hand or a tape to press down the decorative veneer to be broken, thereby further preventing the occurrence of cracks.

  According to the invention described in claim 3, in addition to the effects of the invention described in claim 1 or 2, the hot melt adhesive is applied to the corner portion after bending of the surface of the decorative veneer. Since the coating is applied only to a certain portion, the use of an expensive hot melt adhesive can be minimized.

  According to the invention described in claim 4, in addition to the function and effect of the invention described in any one of claims 1 to 3, the final of the plurality of application processes on the surface of the decorative veneer. Since the hot-melt adhesive is applied immediately before the coating process, the hot-melt adhesive is overcoated from above, and the gloss can be matched with the surrounding coating, resulting in a beautiful finish.

  According to the invention described in claim 5, in addition to the operational effects of the invention described in any one of claims 1 to 3, the final of the plurality of application steps on the surface of the decorative veneer. Since the hot melt adhesive is applied immediately after the coating process, the hot melt adhesive can be applied after the normal coating process and can be easily added to the conventional process. In addition, the adhesion of the coating is good, and the coating is completely protected by the hot melt adhesive.

According to the invention described in claim 6, when the surface of the solid material is applied, the hot melt adhesive is further applied to at least the corner portion of the surface of the solid material after being bent. The hot melt adhesive applied with the tensile force to the surface of the solid material at the time can be suppressed from the outside, and the surface of the solid material can be prevented from cracking.
Therefore, it is possible to perform a bending process while preventing cracking of a solid material that has conventionally been difficult to bend by forming a V-shaped groove on the back surface.

In the invention according to claim 7, when the surface of the decorative veneer bonded to the base material is applied, UV paint is further applied to at least the corner portion of the surface of the decorative veneer after being bent. Also, cracks can be effectively prevented.

Next, with reference to FIG.1 and FIG.2, the manufacturing method of the wooden material which concerns on Embodiment 1 of this invention is demonstrated.
As shown in FIG. 1, the manufacturing method of the wood material which concerns on Embodiment 1 is the sticking process 100, the undercoat process 200, the intermediate coating process 300, the sander process 400, the hot-melt-adhesive application | coating process 1000, and the top coating process 500 in order. , V-cut process 600 and bending process 700. Hereinafter, each step will be described.

First, in the attaching step 100, the decorative veneer 2 is attached to the surface of the substrate 1.
Here, a plywood, MDF (medium density fiber board), etc. are used for the base material 1, and an adhesive agent is used for affixing. At this time, pre-treatment such as impregnation with a drug or the like may be performed on the decorative veneer 2 as necessary. The adhesive is not particularly specified, and a melamine-based thermosetting adhesive, a urethane-based adhesive, or a hot-melt adhesive may be used. In addition, coloring may be performed after the decorative veneer 2 is attached.
Next, in the undercoat process 200 and the intermediate coat process 300, the surface of the decorative veneer 2 is applied to form the undercoat layer 3 and the intermediate coat layer 4. Then, in the sander process 400, sanding is performed to smooth the surface of the decorative veneer 2.

Next, in the hot melt adhesive application process 1000, the hot melt adhesive 10 is applied. The hot melt adhesive 10 to be used is not particularly limited, but is preferably a urethane type or EVA (ethylene vinyl acetate copolymer) type, and more preferably a soft type.
Moreover, it is not necessary to apply the hot melt adhesive 10 to the entire decorative veneer 2, and it may be applied so as to cover a portion of the surface of the decorative veneer 2 that becomes the corner 8 after bending. It is sufficient to apply a few millimeters to 1 cm wider than the part 8. Of course, it may be applied to the entire decorative veneer 2.

Next, in the top coating process 500, the surface of the decorative veneer 2 is painted to form the top coating layer 5, and the coating is completed as described above.
Next, in the V-cut process 600, the V-shaped groove 6 is formed on the back surface of the substrate 1. The V-shaped groove 6 is formed from the back surface to the front surface of the base material 1 and is stopped before reaching the decorative veneer 2 so as not to cut the decorative veneer 2.
In the first embodiment, the V-shaped groove 6 is formed by combining a plurality of V-cuts, so that the corner 8 after bending is chamfered. However, the present invention is not limited to this, and the V-shaped groove 6 is formed by one V-cut so that the bent corner 8 becomes a right angle, or the corner 8 is curved by combining more V-cuts. You may comprise so that it may become close.

  Finally, as shown in FIG. 2, in the bending step 700, the base material 1 and the decorative veneer 2 are bent so as to fill the V-shaped groove 6 around the V-shaped groove 6. At this time, an adhesive is applied to the bent joint 7 inside the V-shaped groove 6. In this way, a wood material having two surfaces is completed.

  As described above, in the first embodiment, the painting process of the decorative veneer 2 includes the three coating processes 200, 300, and 500. Of the coating processes, the top coating process 500 is the final coating process. The hot melt adhesive 10 is applied immediately before.

  According to the method for manufacturing a wood material according to the first embodiment, the hot melt adhesive 10 is further applied at the time of coating the surface of the decorative veneer 2 adhered to the base material 1, so that the decorative veneer 2 at the time of bending is applied. The hot melt adhesive 10 to which the pulling force is applied is suppressed from the outside, and the decorative veneer 2 can be prevented from cracking. Moreover, since this effect continues even after construction as a building material, even if some cracks occur, it is possible to prevent further cracks from spreading.

In addition, since the occurrence of cracks can be prevented, the line speed can be increased, and manual repair is not required, so that productivity can be greatly improved. In addition, there is no work of applying a weak adhesive tape (curing tape) to the corner portion 8 to prevent cracking, and it is not troublesome and does not generate dust, which is suitable for mass production.
Since the application of the hot melt adhesive 10 is performed when the surface of the decorative veneer 2 is applied, it is not necessary to process the decorative veneer 2 itself in advance.
Furthermore, there is no need to use a plastic sheet, and the finish is good.

  In addition, by using a soft hot melt adhesive in urethane or EVA system, the hot melt adhesive 10 itself follows the bending, and exhibits the effect as if pressed by hand or tape, There exists an effect | action which presses down the decorative veneer 2 which is going to be broken, and generation | occurrence | production of a crack can further be prevented.

Further, since the hot melt adhesive 10 is applied only to the portion of the surface of the decorative veneer 2 that becomes the corner 8 after bending, the use of the expensive hot melt adhesive 10 can be minimized.
The disadvantages of the hot melt adhesive 10 are that it is soft and easily scratched, that it is difficult to match the gloss with normal coating, and that unevenness is likely to occur due to a certain thickness, If the coating is applied only to the corner 8, these defects can be minimized.

  Further, since the hot melt adhesive 10 is applied immediately before the top coating process 500 of the plurality of coating processes 200, 300, 500 on the surface of the decorative veneer 2, the top coating is applied from above the hot melt adhesive 10. Can be done to match the surrounding paint and gloss, resulting in a beautiful finish.

Next, with reference to FIG. 3, the manufacturing method of the wooden material which concerns on Embodiment 2 is demonstrated.
FIG. 3 is a process diagram of the method for manufacturing a wood material according to the second embodiment.

As shown in FIG. 3, the manufacturing method of the wood material which concerns on Embodiment 2 is the sticking process 100, the undercoat process 200, the intermediate coating process 300, the sander process 400, the top coating process 500, and the hot-melt-adhesive application process 1000 in order. , V-cut process 600 and bending process 700.
Although the work content of each process is the same as that of the first embodiment, in the second embodiment, the hot melt adhesive application process 1000 is performed between the top coating process 500 and the V-cut process 600. That is, in the second embodiment, the decorative veneer 2 has a coating process including three coating processes 200, 300, and 500, and the hot coating immediately after the top coating process 500, which is the final coating process among the coating processes. It is characterized in that the melt adhesive 10 is applied.

According to the method for manufacturing a wood material according to the second embodiment, it is possible to realize the prevention of cracking of the decorative veneer 2, the improvement of the productivity, and the improvement of the finishing feeling as in the first embodiment.
Further, since the hot melt adhesive 10 is applied immediately after the top coating process 500 among the plurality of coating processes 200, 300, and 500 on the surface of the decorative veneer 2, the hot melt adhesive 10 is applied after the normal coating process. Adhesive 10 can be applied and can be easily added to conventional processes. In addition, the adhesion of the coating is good, and the coating is completely protected by the hot melt adhesive 10.

Next, with reference to FIG. 4, the manufacturing method of the wooden material which concerns on Embodiment 3 is demonstrated.
FIG. 4 is a process diagram of the method for manufacturing a wood material according to the third embodiment.

As shown in FIG. 4, the manufacturing method of the wood material which concerns on Embodiment 3 is the sticking process 100, the hot-melt-adhesive application process 1000, the undercoat process 200, the intermediate coating process 300, the sander process 400, and the top coating process 500 in order. , V-cut process 600 and bending process 700.
Although the work content of each process is the same as that of Embodiment 1, in Embodiment 3, the hot-melt-adhesive application process 1000 is performed between the sticking process 100 and the undercoat process 200. FIG.

  According to the method for manufacturing a wood material according to the third embodiment, it is possible to realize the prevention of cracking of the decorative veneer 2, the improvement of productivity, and the feeling of finish as in the first embodiment.

Next, with reference to FIG. 5, the manufacturing method of the wooden material which concerns on Embodiment 4 is demonstrated.
FIG. 5 is a process diagram of the method for manufacturing a wood material according to the fourth embodiment.

As shown in FIG. 5, the manufacturing method of the wood material which concerns on Embodiment 4 is the sticking process 100, the undercoat process 200, the hot-melt-adhesive application | coating process 1000, the intermediate coating process 300, the sander process 400, and the top coating process 500 in order. , V-cut process 600 and bending process 700.
The work content of each process is the same as that of the first embodiment, but in the fourth embodiment, the hot melt adhesive application process 1000 is performed between the undercoat process 200 and the intermediate coating process 300.

  According to the method for manufacturing a wood material according to the fourth embodiment, as in the first embodiment, it is possible to prevent the decorative veneer 2 from cracking, improve productivity, and improve the finished feeling.

  In the first to fourth embodiments, the coating process is three times of undercoating, intermediate coating, and topcoating. However, the present invention is not limited to this, and it may be applied twice or four times or more depending on the paint used. In that case, a hot melt adhesive application process 1000 may be provided somewhere in the painting process.

Further, instead of the hot melt adhesive, a UV paint may be applied. In this case, the UV paint is soft even after curing, and can prevent cracking like the hot melt adhesive. In particular, it is effective to apply a thick coating so that only the part to be bent is raised.
Furthermore, it is not limited to hot melt adhesives and UV paints, and any material that forms a soft resin layer on the surface of a wood material can be used as a crack preventing material.

  Moreover, in the said Embodiment 1 thru | or 4, although the example applied to the wooden decorative veneer sticking material which stuck the decorative veneer on the surface of the base material as a wooden material was demonstrated, it applies also to a solid material. Is possible. Solid wood is easier to break than plywood, and it has been difficult to bend by forming a V-shaped groove on the back side, but it is bent while preventing cracking, just like wood veneer adhesive be able to.

It is process drawing which shows the manufacturing method of the wooden material which concerns on Embodiment 1 of this invention. It is sectional drawing which shows the wooden material after completion concerning Embodiment 1. FIG. It is process drawing which shows the manufacturing method of the wooden material which concerns on Embodiment 2. FIG. It is process drawing which shows the manufacturing method of the wooden material which concerns on Embodiment 3. It is process drawing which shows the manufacturing method of the wooden material which concerns on Embodiment 4. It is process drawing which shows the manufacturing method of the wooden material which concerns on a prior art example. It is sectional drawing which shows the wooden material after completion concerning a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Base material 2 Single veneer 3 Undercoat layer 4 Middle coat layer 5 Topcoat layer 6 V-shaped groove 7 Bending joint 8 Corner 10 Hot melt adhesive 100 Adhesion process 200 Undercoat process 300 Middle coat process 400 Thunder process 500 Top coat Process 600 V-cut process 700 Bending process 1000 Hot melt adhesive application process

Claims (7)

After applying a decorative veneer on the surface of the base material and coating the surface of the decorative veneer, a V-shaped groove is formed on the back surface of the base material, and the V-shaped groove is centered on the V-shaped groove. In the manufacturing method of the wood material to bend so as to fill
A method for producing a woody material , wherein a hot melt adhesive is further applied to at least a portion of the surface of the decorative veneer that becomes a corner portion when the surface of the veneer veneer is applied.   The method for producing a woody material according to claim 1, wherein the hot melt adhesive is urethane or EVA and is soft.   The method for producing a woody material according to claim 1 or 2, wherein the hot melt adhesive is applied only to a portion of the surface of the decorative veneer that becomes a corner after bending.   The coating process on the surface of the decorative veneer has a plurality of application steps, and the hot melt adhesive is applied immediately before the final application step in the plurality of application steps. The manufacturing method of the wooden material as described in any one of thru | or 3.   The coating process on the surface of the decorative veneer has a plurality of application steps, and the hot melt adhesive is applied immediately after the final application step in the plurality of application steps. The manufacturing method of the wooden material as described in any one of thru | or 3. In the method of manufacturing a wood material, after coating the surface of a solid material, forming a V-shaped groove on the back surface of the solid material, and bending the V-shaped groove around the V-shaped groove,
A method for producing a woody material , wherein a hot melt adhesive is further applied to at least a corner portion of the surface of the solid material after bending at the time of coating the surface of the solid material . After applying a decorative veneer on the surface of the base material and coating the surface of the decorative veneer, a V-shaped groove is formed on the back surface of the base material, and the V-shaped groove is centered on the V-shaped groove. In the manufacturing method of the wood material to bend so as to fill
A method for producing a wood material, characterized in that, at the time of painting the surface of the decorative veneer, a UV paint is further applied to at least a portion of the surface of the decorative veneer that becomes a corner after bending.

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