JPH0729307B2 - Wood surface coating method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface coating method for wood. However, in the present specification, wood means wood used for all products other than Buddhist altars, except wood used for Buddhist altars.

[0002]

2. Description of the Related Art Wood has a unique style of natural products that cannot be realized with plastics and metals, and in particular, natural wood has a unique grain pattern. Utilizing the natural wood grain pattern, it is widely used for various purposes. For example, desks, furniture, shelves and doors used in the kitchen, or boxes for appliances,
Used for musical instruments such as pianos and organs, car dashboards, etc. In order to make the best use of the beautiful natural wood grain, and to keep the wood grain clean forever, the surface is almost always painted. A beautiful surface coating can make wood even more beautiful. Whether to how to beautiful surface coating, is extremely important in the high-grade wood Engineering products. If the surface coating is not clean, the product value will be significantly reduced.

Synthetic resin paints are sprayed to achieve a clean surface coating. This is because the spray method can be applied more beautifully than brush painting. The synthetic resin paint used for spray painting is liquid. The liquid synthetic resin paint is applied to the surface of wood using a spray gun. The mist-like synthetic resin paint applied to the surface of the wood adheres to the surface of the wood to become a smooth surface, and hardens to cleanly paint the surface of the wood. Woodworking products are almost always surface painted this way.

However, it takes a great deal of time to cleanly treat the surface of wood by this method. Also, in order to paint beautifully, extremely high skill, long skill, careful spraying work, and severe environment are required. Furthermore, not only is it time-consuming to spray paint, but it is also more troublesome to polish the painted surface with paper to make a correct correction. Polishing with paper requires several times the effort of spray painting. In particular, the surface painting of a woodworking product having a three-dimensional uneven surface requires a great deal of time to polish with a paper. This is because the uneven surface is rubbed with paper many times to make it smooth, and then the coating is repeated many times. To make matters worse, the paper polishing process is almost impossible to automate. This is because the surface of the polished product is visually observed and the position and degree of polishing are adjusted. Therefore, the polishing process with paper has to be done manually. Furthermore, when it is polished with paper, it is extremely difficult to finish the protruding and entering corners provided on the uneven surface of the wood clearly and neatly. The outer corner is rounded by rubbing it with paper and the inner corner is rounded by the sprayed paint.
Therefore, it repeated many times, and repeats the paper polishing and spray painting, is to finish the uneven surface to crisp and beautiful three-dimensional pattern becomes difficult.

Furthermore, high-grade spray painting requires extremely harsh environments, which adversely affects the health of workers and is a cause of dislike by young workers. The reason why the environment for spray painting is severe is to prevent foreign matter such as dust from adhering to the painting surface. If dust or the like adheres to the coated surface during spray coating, the surface becomes uneven and a clean surface treatment cannot be performed, resulting in a marked decrease in the commercial value of the product. In order to eliminate dust adhesion, it is required to paint in a closed room. The closed chamber is difficult to ventilate sufficiently in order to prevent the ingress of dust, and the odor of the paint is full, which significantly deteriorates the working environment. For this reason, the surface treatment of wood is a very important process for determining the commercial value, but it is extremely difficult to secure young human resources because the working environment is bad and the labor is extremely heavy. The reality is that this is the most problematic process in most factories.

[0006] Further, wood coating has a drawback that the use efficiency of the sprayed paint is extremely low. The paint usage efficiency depends on the shape of the wood to be sprayed. It is said to be about 20% on average. Electrostatic coating can improve the use efficiency of the paint. However, even with electrostatic coating, the use efficiency of the coating is at most about 30%. 70-80% of the sprayed paint is not used effectively and is discarded. Paint that is not effectively used adheres to the walls of the painting room. It takes time to remove the adhered paint. Therefore, it is troublesome to dispose of unused paint. In order to dispose of the paint, most factories incinerate the paint that has peeled off the walls. As described above, the sprayed synthetic resin paints are used only in a range of 1/4 to 1/5, and most of them are time-consuming and discarded.

Wood products that can be surface treated without painting are
It can be solved by molding synthetic resin. A method for realizing this is described, for example, in Japanese Utility Model Publication No. 49-28823. This publication describes a method of manufacturing a door plate material by molding a thermoplastic synthetic resin into a three-dimensional shape. The door, which is entirely made of synthetic resin, cannot be hinged with screws.
A piece of wood is insert-molded in synthetic resin for screwing. This method allows efficient mass production of doors. However, in reality, the woodworking product manufactured by this method cannot wipe away the image of what is called a “cheap product of a synthetic resin molded product”. Therefore, a synthetic resin molded product cannot be a high-grade woodwork product. This woodworking product is
There is no unique atmosphere of wood, and it cannot be used as a substitute for wood woodworking products that have been frequently used. If you can insert a large piece of wood and mold synthetic resin on the surface of the wood, you can get rid of the image of cheap goods. However, large pieces of wood cannot be inserted by the conventional method. This is because a thermoplastic synthetic resin that is softened by heating is used as the synthetic resin, and thus the wood is significantly deformed by the heat of the synthetic resin.

Further, Japanese Utility Model Laid-Open No. 56-130490 discloses a method for manufacturing a woodworking product. The method described in this publication uses a small piece of wood in order to eliminate the image of synthetic resin and give it the same appearance as wood, and this is molded into a three-dimensional plate with a synthetic resin binder. ing.
On the surface of the formed plate material, a veneer sliced thinly from Karaki etc. is adhered to finish the surface.

[0009]

According to this method, the surface can have a wood pattern. However, in this method, as in the case of the conventional wood, it is necessary to adhere the veneer to the surface of the plate material and then finish the surface by a method such as spray painting. That is, the plate material obtained by molding the wood pieces into the concavo-convex shape is not surface-treated as it is, and it is necessary to finish the surface in the same process as the wooden plate material. For surface finishing, apply a base paint several times to the surface of the plate material to which the veneer or the like is adhered, and polish the uneven surface with paper after each coating, and then finish the surface. It is necessary to spray the paint multiple times to apply it, and to finish the uneven surface with paper each time it is applied. In this surface treatment process, polishing the surface with paper takes a lot of time and effort. This is because a plate material having an uneven surface cannot be automatically and efficiently polished by using a polishing device, and an operator manually finishes it one by one. For this reason, a plate material having a three-dimensionally uneven surface takes a lot of time and effort to finish the surface, and the working environment of this process is extremely bad, which causes the cost of the surface finishing to increase.

Furthermore, since the polishing is done manually to finish it into a mirror surface, there is a disadvantage that the beauty of the finish can vary depending on individual differences. In particular, to finish the uneven surface neatly,
It is necessary for an expert to carefully polish. This further increases the labor cost of the polishing process and increases the manufacturing cost of the woodworking product.

The present invention was further developed with the object of resolving this drawback. An important object of the present invention is to make the surface of wood easy and easy, and efficiently and neatly finish it. To provide a painting method. Another important object of the present invention is to provide a method for coating the surface of wood which improves the working environment and allows for a clean surface treatment.

[0012]

In order to achieve the above-mentioned object, the wood surface coating method of the present invention coats a woodworking product by the following method. The method for coating the surface of wood is to apply a transparent or translucent synthetic resin paint to the surface of wood to coat the surface of wood, and is characterized in that the synthetic resin paint is applied to the surface in the following steps.

(A) A step of temporarily fixing the wood 1 in the molding chamber 4 in which a predetermined molding gap 4A is formed on the coated surface. The surface coating method of the present invention does not specify the wood 1 as natural wood. The wood 1 is used in a broad sense, including wood formed by cutting natural wood into small pieces or crushing them into a binder. (B) A step of injecting into the molding chamber 4 of the mold 3 that has been clamped from the outside, the synthetic resin coating material that is hardened without heating and liquid or pasty without heating. Polyester-based, urethane-based, and epoxy-based paints can be used as the synthetic resin paint that cures without heating. The polyester-based synthetic resin paint is poured into the molding chamber 4 by adding a curing agent. Two kinds of urethane-based and epoxy-based synthetic resin paints are mixed and poured into the molding chamber 4. The method of the present invention uses a synthetic resin paint that cures without heating, but it goes without saying that this paint can also be heated and cured to a temperature that does not adversely affect wood.

(C) A step of clamping the mold 3 and curing the injected synthetic resin paint in a state of being in close contact with the surface of the wood 1. (D) A step of removing the woodworking product having the surface coated with the synthetic resin paint after the synthetic resin paint is cured.

Wood used in the surface coating method of the present invention 1
Can use a planar thing and what has a three-dimensional uneven | corrugated surface. Further, the surface of the wood 1 can be finished with a synthetic resin paint to give a three-dimensional uneven surface.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. However, the examples shown below are examples of the method for embodying the technical idea of the present invention, and the method of the present invention does not specify the material and shape of the parts to be used as follows. . The method of the present invention can be modified without departing from the scope of the claims.

Further, in this specification, in order to make the claims easy to understand, the numbers corresponding to the members shown in the embodiments are referred to as "claims column" and "to solve the conventional problems. It is added to the members shown in "Means column" and "Action column". However, the members shown in the claims are
It is by no means specific to the members of the examples.

FIG. 1 is a front view of the door of the system kitchen, and FIG. 2 is a sectional view taken along the line AA of the door shown in FIG. Door shown in figure this like, solid with the frame 6 to the periphery of the timber 1 of the square-shaped
I have decided. The door 1 is surface-coated with the wood 1 fixed to the frame 6 by the following method.

The door shown in FIG. 2 has a frame 6 fixed to the periphery of a plate-shaped wood 1. As shown in the cross-sectional view of FIG. 2, the wood 1 is removed by cutting the peripheral edge of the plate material with an NC cutting device,
It has an uneven shape with a convex portion at the center. Further, the wood 1 shown in FIG. 2 can be processed into an uneven shape by bonding another wood board whose peripheral edge is curved by an NC cutting device to the surface of a flat plate material. The wood 1 is preferably a natural veneer. However, for the wood 1, a veneer board can be used instead of the veneer board. Further, wood cut into small pieces and press-formed into a plate shape can also be used. The wood 1 can also be directly painted on the surface. However, it is also possible to adhere a surface sheet such as a veneer to the surface of the wood 1 and apply the surface coating thereon. Furthermore, after the wood 1 is cut into an uneven shape by an NC cutting device or the like, wood grain may be printed on the surface or handwritten for decoration.

The wood 1 which is not a natural wood is obtained by cutting the natural wood into small pieces, crushing it into powder, or processing it into a fiber, and mixing this with a synthetic resin binder.
Pressure molding is performed. At the time of molding, it can also be molded into a plate shape having an uneven surface. Uneven wood 1
Can be decorated by adhering a veneer of high quality wood to the surface.

A base paint is applied to the wood 1 manufactured through the above steps. As the base paint, a sealer which is compatible with both the wood 1 and the plastic coating film 2 and firmly adheres thereto, for example, a sealer which is a urethane type synthetic resin paint is used. The base paint is sprayed on the surface of the wood 1. In the conventional coating method, after applying the sealer, it was necessary to polish with a paper to finish the surface smooth. This is because if the base paint has irregularities, the plastic coating film 2 applied to the surface also has irregularities. The coating method of the present invention can eliminate or simplify the work of polishing the surface of the base paint with paper. This is because even if the surface of the base paint is uneven, the surface of the plastic coating film 2 cannot be uneven. However, when the base paint has extremely large unevenness, it is preferable to easily polish the surface of the base paint to reduce the uneven surface and form the plastic coating film 2.
The wood 1 coated with the urethane-based sealer forms the plastic coating film 2 within 200 hours, preferably within 100 hours. This is because the urethane-based sealer has a hydroxyl group for a certain period of time after being applied, and this has the property of reacting well with the polyester resin and adhering well. The hydroxyl groups of the sealer react with water in the air to form carbon dioxide and amine. For this reason, the adhesive strength between the base paint and the plastic coating film 2 decreases with the passage of time after the sealer is applied. Instead of the urethane-based sealer, any material that can adhere to both the wood 1 and the plastic coating film 2 can be used.

As shown in FIG. 3, the wood 1 coated with the base paint is temporarily fixed to the molding chamber 4 of the mold 3 and the mold 3 is clamped. A step portion 9 is provided on the peripheral edge of the molding chamber 4 in order to sandwich the wood 1 and temporarily fix it to the molding chamber 4 of the mold 3.
The peripheral edge of the wooden piece 1 is fitted into the step portion 9 to temporarily fix the wooden piece 1 in a state where it cannot be moved. The mold 3 that is fitted into the step portion 9 to temporarily fix the wood 1 has a feature that the wood 1 can be reliably temporarily fixed in a fixed position in a state where the wood 1 cannot be moved. Gold not shown
Type, Yorazu the step portion, a protrusion that pinched timber provided may be temporarily fixed by clamped timber with the protrusion.

The mold 3 for temporarily fixing the wood 1 has a molding chamber 4 having a molding gap 4A on the coated surface of the wood 1. The molding gap 4A of the mold 3 shown in FIGS. 3 and 4 forms the plastic coating film 2 on the surface of the wood 1 with a constant film pressure. Therefore, the molding gap 4A has a shape capable of forming a constant gap on the surface of the wood 1. In the molding chamber 4, as shown in FIG.
The supply hole 5 is opened for injecting the uncured synthetic resin paint. Further, the molding chamber 4 is provided with an exhaust hole 7 for exhausting the internal air when the synthetic resin paint is injected from the supply hole 5. The exhaust hole 7 is provided so as to be connected to the upper portion of the molding chamber 4.

With the mold 3 clamped, a liquid or paste synthetic resin paint is injected into the molding chamber 4 from the supply hole 5. It is not necessary to inject the synthetic resin coating material into the molding chamber 4 at high pressure as in injection molding. The synthetic resin paint is injected into the molding chamber 4 at a pressure such that it can be injected without gaps.

As the synthetic resin coating material, one which is cured without being heated from the outside and which is in a liquid or paste state without being heated is used. The synthetic resin paint which is heated and cured from the outside causes the wood 1 to be deformed, altered, or cracked by heat when it is hardened. Polyester resin is most suitable for this type of synthetic resin paint. The polyester resin is a liquid resin dissolved in a monomer (for example, styrene) capable of copolymerizing with the unsaturated bond in the unsaturated polyester. The polyester resin is polymerized and cured. Unlike amino resins and phenolic resins, it does not release volatile substances such as water when it cures. Further, the polyester resin can be made liquid without adding a solvent. For this reason, it is possible to reduce the volume reduction upon curing. Further, the plastic coating film 2 formed by applying a polyester resin has a strong coating film strength and can protect the surface of the wood 1 robustly. The polyester resin is mixed with a curing agent and injected into the molding chamber 4. The curing agent oxidizes cobalt with peroxide and causes the reaction heat energy at this time to cause the polyester polyol to undergo a curing reaction. Therefore, this synthetic resin coating material can be cured without external heating. Therefore, the heat of hardening does not change the quality of the wood 1.

For a liquid or pasty synthetic resin coating material which cures without heating, instead of the polyester resin,
Urethane-based and epoxy-based synthetic resin paints can also be used.
Urethane-based and epoxy-based synthetic resin coatings
The liquid is kneaded and poured into the molding chamber 4. The urethane type synthetic resin coating material mixed and injected is cured by a crosslinking reaction in the molding chamber 4. The epoxy-based synthetic resin coating material is also polymerized and cured in the molding chamber 4.

The volume of the synthetic resin coating material shrinks when it is cured in the molding chamber 4. When the volume of the injected synthetic resin coating material contracts, the surface of the plastic coating film 2 is separated from the inner surface of the molding chamber 4 and hardens. In this state, fine recesses are formed on the surface of the plastic coating film 2. Therefore, the surface of the plastic coating film 2 cannot be finished into a smooth mirror surface. This phenomenon becomes serious when the thickness of the plastic coating film 2 is increased. This is because the thick plastic coating film 2 increases the amount of synthetic resin coating used. If a large amount of synthetic resin coating material is used, the total amount of volume reduction will be large even if the volume reduction rate is the same. Therefore, the concave portion on the surface of the plastic coating film 2 becomes deep.

The mold 3 shown in FIG. 3 has a rubber-like elastic body 8 sandwiched between the two molds 3 in order to eliminate this drawback. The rubber-like elastic body 8 is, as shown in FIG.
It is arranged on the peripheral edge of and is fixed to the mold 3. The method of temporarily fixing the wood 1 to the step portion 9 of the rubber-like elastic body 8 has a feature that the wood 1 having the plastic coating film 2 formed on its surface can be easily released from the mold 3. This is because the rubber-like elastic body 8 can be deformed when the wood 1 is released from the mold, and the plastic coating film 2 is not firmly adhered to the rubber-like elastic body 8. The rubber-like elastic body 8 is fixed by being sandwiched between the two molds 3.

The rubber-like elastic body 8 changes the pressure for pressing the mold 3 to reduce the volume of the molding chamber 4. Two molds 3
When the pressure for clamping the mold is low, the rubber-like elastic body 8 becomes thick and the volume of the molding chamber 4 becomes large, as shown in FIG.
When the two molds 3 are strongly pressed in the direction shown by the arrow in FIG. 3, the rubber-like elastic body 8 is crushed thinly and the volume of the molding chamber 4 is reduced, as shown in FIG. When the volume of the molding chamber 4 becomes smaller, the synthetic resin coating material that hardens and decreases in volume can be adhered to the inner surface of the molding chamber 4.

The mold 3 having this structure is used in the following state. When the wood 1 is temporarily fixed and the synthetic resin paint is injected into the molding chamber 4, the pressing force of the mold 3 is weakened. In this state, the rubber-like elastic body 8 is thick and the volume of the molding chamber 4 is large. In this state, the synthetic resin paint is injected into the molding chamber 4. The synthetic resin paint fills the molding chamber 4 without any gap. After that, the injected synthetic resin paint is allowed to undergo a curing reaction while being left as it is for a certain period of time. When the curing reaction of the synthetic resin coating material progresses and this gelates and the volume starts to decrease, the pressing force of the mold 3 is increased in the direction shown by the arrow in FIG. Then, as shown in FIG. 4, the rubber-like elastic body 8 is crushed thinly. The pressure for pressing the mold 3 is adjusted so that a predetermined amount of synthetic resin paint is pushed out from the exhaust hole 7. In other words, the synthetic resin paint whose volume has started to decrease is pushed out from the exhaust hole 7 to be brought into close contact with the inner surface of the molding chamber 4. Therefore, even if the volume of the molding chamber 4 is reduced even if the volume of the synthetic resin coating material is cured and reduced, the synthetic resin coating material is adhered to the inner surface of the molding chamber 4 and cured.

The mold 3 is held in a state in which the rubber-like elastic body 8 is squeezed slightly thinly, and the synthetic resin paint is cured in this state. When the synthetic resin coating material hardens, it is demolded and the woodworking product is removed from the mold 3.

In this way, the plastic coating film 2 is formed in close contact with the surface of the wood 1. The thickness of the plastic coating film 2 is usually 0.2 to 5 mm, preferably 0.4 to
It is adjusted in the range of 3 mm. It is preferable that the plate material having the veneer adhered to the surface has the plastic coating film 2 of 0.5 to 4 mm to be slightly thick. As shown in FIG. 3, the plastic coating film 2 is generally provided on the surface of the wood 1 to have a uniform film thickness.

In the method for coating the surface of wood according to the present invention, as shown in FIG. 6, a plastic coating film 2 having irregularities can be applied on the surface of the planar wood 1. In this case,
As shown in FIG. 5, a mold 3 having partially different thicknesses of the molding gap 4A is used. When the plastic coating film 2 is formed in this manner, the wood 1 has a planar shape and the surface can be decorated with a three-dimensional uneven pattern.

Further, the synthetic resin paint to be injected into the molding chamber 4 can be mixed with a pigment or a dye to color the plastic coating film 2. Colored plastic coating film 2
Beautifully colors the wood grain pattern on the surface of wood 1. Especially,
By coloring with the plastic coating film 2, it is also possible to color the plate materials in a uniform color.

In the wood surface coating method of the present invention, a synthetic resin paint which is hardened without heating and liquid or pasty is poured into the molding chamber 4 without heating and the surface is coated with the plastic coating film 2. Therefore, the surface coating method of the present invention does not require heating the mold 3. However, it goes without saying that the conditions for curing the injected synthetic resin paint can be adjusted in the same manner in summer and winter, and the mold 3 can be heated to some extent in order to shorten the curing time. Mold 3
When heating, the heating temperature of the mold 3 is 20 to 70 ° C.,
It is preferably set in the range of 25 to 50 ° C.

[0036]

The wood surface coating method of the present invention realizes the following epoch-making features which are superior to the conventional methods. The woodworking product can be surface-painted easily and easily, efficiently and neatly without the need for advanced technology. This is because the wood that has been processed into a flat or uneven shape can be temporarily fixed in the molding chamber of the mold, and synthetic resin can be pressed onto the surface of the wood to form a plastic coating film of a certain thickness.
In this method, the surface condition of the mold forming chamber determines the surface condition of the plastic coating film. Unlike conventional methods, the coating technology does not determine the surface condition of the plastic coating film. The molding chamber of the mold can have a very clean surface finish. For example, the surface of the plastic coating film can be mirror-finished by mirror-finishing the inner surface of the molding chamber. In particular, the surface coating method of the present invention does not cause the surface to become uneven due to foreign matter such as dust adhering to the surface. This is because foreign matter such as dust can be embedded inside the plastic coating film in the molding process. In the conventional method of spray-painting synthetic resin paint, even if foreign matter adheres to the surface of wood, or in the method of coating, even if foreign matter adheres to the surface of the plastic coating film, the surface can be raised,
Can not and Shiageruko to clean surface state. However, according to the method of the present invention, a foreign substance can be embedded in the plastic coating film to obtain an extremely beautiful mirror surface.

The process of polishing the coated surface with paper can be minimized. This is because the plastic coating film can be mirror-finished in the molded state by the molded chamber. In the conventional method of coating using a spray gun, it was necessary to spray a synthetic resin paint using the gun to cure it, and then polish the surface with paper to finish it into a mirror surface. This work is extremely labor intensive, and is a very bad working environment in which dust is scattered. The method of the present invention does not require polishing to finish it to a mirror surface, and has a feature that this process can be remarkably labor-saving.

The working environment can be significantly improved. The method of injecting the synthetic resin into the molding chamber of the mold for molding can provide a work environment superior to that of the method of coating using a conventional spray gun. When the woodworking product is painted by the conventional method, the working environment becomes the most severe environment in the manufacturing plant. This is because the paint and its vaporized substances sprayed from the spray gun float in the air. The worker sucks a substance floating in the air. Even if a mask or the like is used, it is extremely difficult to eliminate suction of suspended matter. Workers need to work in a room full of paint odor. Furthermore, it is required to work in a completely sealed room so that foreign matter such as dust does not adhere to the painted surface. This makes it difficult to sufficiently ventilate the air, hinders the rapid exhaust of suspended solids, and deteriorates the working environment. On the other hand, the surface coating method of the present invention can cure the synthetic resin inside the molding chamber and prevent it from scattering into the air. Further, it is not necessary to hermetically seal the room in order to prevent dust from adhering. The synthetic resin paint injected into the closed molding room does not scatter in the room. For this reason , there is a feature that the working environment in the painting process can be remarkably improved and comfortable working can be performed.

The use efficiency of the paint can be dramatically improved. In the conventional coating method using a spray gun, the paint is scattered in the air and attached to the surface of the wood. In the surface coating method of the present invention, a plastic coating film is formed by injecting a synthetic resin coating material into a molding chamber. This method can effectively use all synthetic resin paints to be injected into the molding chamber. The surface coating method using a spray gun has a coating efficiency of about 20%. According to the method of the present invention, it is possible to increase the use efficiency of the coating material to 80% or more, and substantially reduce the coating material used to 1/4 to form a surface coating material having the same film thickness. This is
In addition to reducing paint costs, the disposal of paint that has not been used for painting can be simplified. The painting method using a spray gun requires removing the unused paint and incinerating it, which requires a lot of time and money for disposal. However, according to the surface coating method of the present invention, the amount of the unused paint can be extremely reduced, and since the discarded paint is hardened in a state of being connected to the wood, it can be easily discarded.

Surface coating can be performed in a state in which the woodworking product is prevented from being deformed or cracked. The wood temporarily fixed in the molding chamber can be held in a shape that repairs distortion and cracks. When the surface is coated with a plastic coating film in this state, the surface plastic coating film cures in a state of reinforcing wood. In particular, according to the surface coating method of the present invention, the plastic coating film can be thickened, and since the use efficiency of the coating material is extremely high, a thick plastic coating film can be formed on the surface without increasing the coating cost. The thick plastic coating film strengthens the wood surface to prevent distortion and cracking.

Repairing can be facilitated by molding a thick plastic coating film. The conventional spray gun coating method requires spray coating many times in order to form a thick plastic coating film. This is because the film thickness that can be applied at one time is limited. If you apply it thickly at one time, the paint will run off and you will not be able to apply a beautiful flat surface. The surface coating method of the present invention is not limited by the film thickness of the plastic coating film molded once. This is because the synthetic resin paint is injected into the molding chamber and cured. The thick plastic coating film can be easily repaired by polishing the surface even if the surface is scratched.

Furthermore, in the wood surface coating method of the present invention, a three-dimensional uneven pattern can be provided on the surface in the coating process.
In the conventional coating method using a spray gun, it is necessary to form an uneven pattern on wood in order to form an uneven pattern on the surface. For this reason, the woodworking product having the uneven pattern takes time and effort to manufacture wood. The surface coating method of the present invention can mold the surface of the plastic coating film into a three-dimensional concavo-convex pattern by using a mold having a concavo-convex pattern on the inner surface of the molding chamber. Furthermore, the three-dimensional concavo-convex pattern formed in the molding chamber has a feature that it can be made extremely beautiful by a mold. The conventional coating method in which a three-dimensional pattern is formed on wood and a paint is sprayed on the three-dimensional pattern requires polishing the plastic coating film with paper after the paint is cured. Polishing with paper deforms the corners of the uneven pattern, making it impossible to create a sharp and beautiful pattern. The surface coating method of the present invention does not require paper finishing and can easily form a beautiful three-dimensional pattern.

[Brief description of drawings]

FIG. 1 is a front view of a door which is surface-treated by a method according to an embodiment of the present invention .

[2] A-A shear plane view of the door shown in FIG. 1

FIG. 3 is a cross-sectional view of a mold for molding a plastic coating film on the surface of the door shown in FIG.

FIG. 4 is a cross-sectional view showing a state where the rubber-like elastic body of the mold shown in FIG. 3 is crushed thinly.

5 is a plan view showing a state where the mold shown in FIG. 3 is opened.

FIG. 6 is a sectional view showing a mold for painting a wood surface by another method of the present invention.

[Explanation of symbols]

 1 Wood 2 Plastic Coating Film 3 Mold 4 Molding Room 4A Molding Gap 5 Supply Hole 6 Frame 7 Exhaust Hole 8 Rubber-like Elastic Body 9 Step

Claims (3)

[Claims] 1. A method for coating a surface of wood by applying a transparent or semi-transparent synthetic resin paint to the surface of wood (1), the method comprising the steps of: A method for coating a surface of wood, characterized by attaching a surface. (A) A step of temporarily fixing the wood (1) in a molding chamber (4) having a predetermined molding gap (4A) on the coated surface. (B) A step of injecting into the molding chamber (4) of the mold (3) which has been clamped from the outside, a synthetic resin paint which is hardened without heating and is liquid or pasty without heating. (C) A step of holding the mold (3) in a clamped state and curing the injected synthetic resin paint in a state of closely adhering to the surface of the wood (1). (D) A step of removing the woodworking product having the surface coated with the synthetic resin paint after the synthetic resin paint is cured. 2. The method for coating a surface of wood according to claim 1, wherein the wood (1) having a three-dimensional uneven surface is used. 3. A mold (3) having a three-dimensionally uneven molding gap (4A) is used, and the surface of the wood (1) is coated with a synthetic resin paint having an uneven pattern. 1. The surface coating method for wood according to 1.