JPH0729306B2 - 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 method for coating the surface of an object to be coated which is easily affected by heat.

[0002]

2. Description of the Related Art Wood is a typical material to be coated which is easily affected by heat. Wood is a natural product that cannot be realized with plastic or metal, and natural wood has a unique grain pattern. Utilizing the natural wood grain pattern, it is widely used for various purposes. For example, a desk,
It is used for furniture, shelves and doors used in the kitchen, boxes for electric appliances, musical instruments such as pianos and organs, and dashboards for cars. Utilizing the beautiful natural grain of wood,
In addition, the surface is painted almost without exception in order to keep the wood grain beautiful. A beautiful surface coating can make wood even more beautiful. How to make a beautiful surface is extremely important for high-end wood 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 an object to be coated such as wood using a spray gun. The mist-like synthetic resin paint applied to the surface of wood or the like adheres to form a smooth surface and hardens to cleanly paint the surface of wood or the like. Woodworking products are almost always surface painted this way.

However, it takes a great deal of effort 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.
For this reason, if the polishing and spray painting are repeated a number of times, it becomes difficult to finish the uneven surface clearly and beautifully.

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. Therefore, the surface treatment of wood and the like is an extremely 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.

Further, the painting of wood or the like has a drawback that the use efficiency of the paint to be sprayed is extremely low. The use efficiency of the paint 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 woodworking products that have been widely 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 timbers cannot be inserted by conventional methods. 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 then polish the uneven surface with paper for 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.

In order to solve these drawbacks, the present inventors temporarily mold the wood in the molding chamber of the mold and inject it into the molding chamber by injecting a synthetic resin paint that undergoes a curing reaction without heating. With this new technology, we succeeded in solving all the drawbacks of conventional spray painting. This surface coating method is an epoch-making method which is superior to the conventional method. The new method does not require advanced painting technology,
By omitting the paper polishing, a beautiful mirror surface that cannot be achieved by paper polishing is realized, the working environment is improved, and the features that dramatically improve the use efficiency of synthetic resin paints are realized. However, the new surface coating method has a drawback that if the film thickness of the plastic coating film is increased, the surface cannot be finished neatly.

The present invention was further developed for the purpose of solving this drawback. An important object of the present invention is to form a thick plastic coating film to form a clean surface. It is to provide a surface coating method. Another important object of the present invention is to easily and easily finish the surface of an object to be coated, which is susceptible to heat, efficiently and neatly, and further improve the working environment to perform a neat surface treatment. It is to provide a surface coating method.

[0013]

According to the surface coating method of the present invention, the object to be coated is surface coated by the following method in order to achieve the above-mentioned object. The surface coating method of the present invention is described below.
This is a further improvement of the method of surface-coating the article to be coated in the step of. The object to be coated is temporarily fixed in the molding chamber 4 in which a predetermined molding gap 4A is formed on the coated surface, and the mold is clamped. Synthetic resin paint which is hardened without heating from the outside and is in liquid or paste form without heating is injected into the molding chamber 4. The mold 3 is held in the mold clamped state, and the injected synthetic resin paint is cured to form the plastic coating film 2. Then demold. In the surface coating method according to claim 1 of the present invention, the volume of the molding chamber 4 becomes narrower as the molding gap 4A becomes smaller as the curing reaction of the synthetic resin coating material injected into the molding chamber 4 progresses and the volume decreases. The feature is that the synthetic resin coating material whose volume is reduced in the direction is held in a state of being in close contact with the inner surface of the molding chamber 4 and cured.

Further, in the surface coating method according to the second aspect of the present invention, in the state where the volume of the synthetic resin coating material injected into the molding chamber 4 is reduced by the progress of curing reaction, the molding chamber 4 is in an uncured state. The synthetic resin paint of (1) is press-fitted, and the synthetic resin paint in the molding chamber 4 whose volume has been reduced is held in a state of being in close contact with the inner surface of the molding chamber 4 and cured.

[0015]

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 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. The door shown in these figures has a frame 6 fixed to the peripheral edge of the rectangular wood 1. 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 1 obtained by cutting wood into small pieces and press-forming it into a plate shape can also be used. Wood 1
It can also be painted directly 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 non-natural wood 1 is obtained by cutting the natural wood into small pieces, crushing it into powder, or processing it into fibrous material, and mixing it 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 in 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.

Wood 1 coated with urethane sealer
Molds 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 the base paint.

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. Although not shown, the mold 3 may be provided with a protrusion that holds the wood 1 regardless of the stepped portion 9 of the molding chamber 4, and the wood 1 may be sandwiched by the protrusion and temporarily fixed.

The molding chamber 4 of the mold 3 for temporarily fixing the wood 1 is
There is 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 in which a constant gap is formed on the surface of the wood 1. As shown in FIG. 5, the molding chamber 4 is provided with a supply hole 5 for injecting an 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 separates from the inner surface of the molding chamber 4 and hardens. In this state, minute recesses such as traces of insects 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 rubber-like elastic body 8 is fitted in a V groove provided in the peripheral edge of the molding chamber 4 of the mold 3 and fixed in a fixed position. The rubber-like elastic body 8 is provided with a step portion 9 on the inner peripheral edge thereof for temporarily fixing the wooden piece 1. Thus, the mold 3 for temporarily fixing the wood 1 to the step portion 9 of the rubber-like elastic body 8 has a feature that the wood 1 on which the plastic coating film 2 is molded 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 cured plastic coating film 2 does not adhere firmly to the rubber-like elastic body 8.

The rubber-like elastic body 8 changes the pressure for pressing the mold 3 to reduce the volume of the molding chamber 4. When the pressure for clamping the two molds 3 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 dies 3 are strongly pressed in the direction shown by the arrow in FIG. 3, the rubber-like elastic body 8 is crushed thinly as shown in FIG. 4, and the volume of the molding chamber 4 is reduced. When the volume of the molding chamber is reduced, the synthetic resin paint, which is hardened and reduced 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 coating material is allowed to cure 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 synthetic resin coating material is reduced by curing, the volume of the molding chamber 4 is also reduced, so that 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, the mold is removed and the woodworking product is taken out 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.

The surface coating method of the object to be coated of the present invention is shown in FIG.
As shown in, the surface of the planar wood 1 may be coated with the uneven plastic coating film 2. in this case,
As shown in FIG. 6, 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.

7 and 8 show a method of surface-painting the frame 6. The mold 3 shown in these figures has a rectangular molding chamber 4 in which a frame 6 assembled in a rectangular shape can be arranged.
A space for sandwiching the rubber-like elastic body 8 is provided inside the rectangular molding chamber 4. The molding chamber 4 is designed so that the frame 6 is temporarily fixed inside and a molding gap 4A is formed on the peripheral edge thereof. FIG. 7 shows a state where the synthetic resin paint is injected into the molding gap 4A. FIG. 8 shows a state where the volume of the molding chamber 4 is reduced by pressing the mold 3 as indicated by an arrow when the synthetic resin coating material is hardened and gelled. Molding room 4
When the pressure is reduced, the rubber-like elastic body 8 is crushed thinly as shown in FIG. The crushed rubber-like elastic body 8 determines the molding gap 4A. This is because the rubber-like elastic body 8 that is crushed when the mold 3 is pressed is sandwiched by the mold 3.

As shown in FIG. 8, the molding gap 4A is designed so that the plastic coating film 2 having the same thickness is formed on the surface of the frame 6 while the mold 3 is pressed. Therefore, in the state shown in FIG. 7 in which the synthetic resin paint is injected into the mold 3, the molding gap 4A on the upper and lower surfaces of the frame 6 is wider than the molding gap 4A on the left and right surfaces. Upper and lower molding gap 4A
Is because the die 3 is pressed and becomes narrower. In this way, the plastic coating film 2 can be formed on the surface of the object to be coated by narrowing a part of the molding chamber 4.

In the mold 3 shown in FIGS. 3, 6 and 7, the volume of the molding chamber 4 can be adjusted by crushing and adjusting the elastic body of the rubber-like elastic body 8. The hard rubber-like elastic body 8 reduces the volume reduction of the molding chamber 4 in a thick state even when it is crushed. The soft rubber-like elastic body 8 becomes thin when it is crushed and increases the volume reduction of the molding chamber 4. The elastic coefficient of the rubber-like elastic body 8 is designed so that the synthetic resin coating material having a reduced volume comes into close contact with the inner surface of the molding chamber 4 in the crushed state.

It is also possible to provide a stopper 10 on the mold 3 to determine the volume of the molding chamber 4 in the pressed state. 3 and 6
The mold 3 shown in FIG.
Is provided. As shown in FIG. 4, the stopper 10 collides with the mold 3 in a pressed state and limits the decrease in the volume of the molding chamber 4 to a constant value. The mold 3 shown in FIG. 7 has a stopper 1 provided with a synthetic resin paint supply hole 5 provided on the outer periphery of a molding chamber 4.
Used in combination with 0. The supply hole 5 is a state where the mold 3 is pressed,
As shown in FIG. 8, the volumes of the molding chamber 4 are restricted from abutting against each other and are restricted. The rubber-like elastic body 8 is sandwiched between the portions other than the supply hole 5 to close the opening. The supply hole 5 is a square hole, and when the mold 3 is pressed, it is hit and closed as shown in FIG.

In the mold 3 shown in FIG. 9, the rubber-like elastic body 8 is sandwiched in the molding gap 4A. In the mold 3 having this shape, the object to be coated can be directly positioned by the mold 3, so that the mold 3 can be temporarily fixed at an accurate position. The mold 3 shown in FIG. 10 connects the on-off valve 11 to the closed molding chamber 4 to limit the volume reduction of the molding chamber 4. If the on-off valve 11 is closed while the mold 3 is being pressed, the synthetic resin paint will not be extruded from the molding chamber 4.
When the opening / closing valve 11 is opened while the mold 3 is pressed, the synthetic resin paint is extruded and the volume of the molding chamber 4 gradually decreases. Therefore, the volume of the molding chamber 4 can be adjusted by closing the opening / closing valve 11.

Further, FIG. 11 shows a mold 3 which does not use the rubber-like elastic body 8. The mold 3 includes a rod 12 for temporarily fixing the wood 1. The tip of the rod 12 is elastically pushed out into the molding chamber 4 by the spring 13. The amount by which the rod 12 projects into the molding chamber 4 is determined by the collar 12A. The object to be coated is temporarily fixed while the spring 13 elastically presses the rod 12. The volume of the rod 12 is reduced by the curing reaction of the synthetic resin coating material, and when the volume of the molding chamber 4 is reduced by pressing the mold 3, the rod 12 is extruded by the object to be coated. When the die 3 is pressed, the stopper 10 hits the object to be coated, and the molding gap 4
The gap A is limited.

Furthermore, in FIG. 11, in order to press the two molds 3 and reduce the volume of the molding chamber 4, the collar 1 is attached to the outer periphery.
4 is provided, and the collar 14 is fastened by the fastening member 15. A screw and a nut are used for the fastening member 15.
The screw penetrates the collar 14 and a nut is screwed into it to reduce the volume of the molding chamber 4. This mold 3 has a feature that the volume of the molding chamber 4 can be maintained in a reduced state.

The synthetic resin paint to be injected into the molding chamber 4 of the mold 3 may be mixed with pigments or dyes 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 surface coating method of the object to be coated of the present invention, the synthetic resin coating material 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. When heating the die 3, the heating temperature of the die 3 is 20 to 70.
C., preferably in the range of 25 to 50.degree.

[0043]

The surface coating method of the object to be coated of the present invention comprises:
It realizes the following epoch-making features that are superior to conventional methods. It has the feature that the surface of the plastic coating film can be made as clean as any conventional coating method. This is because the surface coating method of the object to be coated of the present invention can be molded while keeping the close contact with the inner surface of the molding chamber as the volume of the molding chamber is reduced when the synthetic resin coating material is cured. Synthetic resin paint that cures in close contact with the molding room
The shape is exactly the same as the inner surface of the molding chamber. For this reason, when the inner surface of the molding chamber is mirror-finished, the surface of the plastic coating film becomes a smooth surface that is not so beautiful as it can be achieved by polishing with paper. Further, even if some dust is mixed in the synthetic resin paint, the dust is not buried in the plastic coating film and does not make the surface uneven. Furthermore, even if the base coating has irregularities, the surface of the plastic coating film becomes a beautiful mirror surface. This is because the inner surface of the molding chamber corrects the unevenness to mold the plastic coating film. Furthermore, the surface coating method of the object to be coated of the present invention is such that the inner surface of the molding chamber has a three-dimensionally uneven wood grain pattern or a natural leather uneven pattern so that the surface of the plastic coating film has a natural wood grain pattern. It can also have a three-dimensional pattern that is the same as leather.

Further, the surface coating method of the object to be coated of the present invention has a feature that a considerably thick plastic coating film can be beautifully formed on the surface of the object to be coated. When a thick plastic coating film is formed on the surface of an object to be coated, when the synthetic resin coating material is cured, the volume is reduced and a deep recess is formed. According to the surface coating method of the present invention, when the volume is reduced due to the curing reaction, the volume of the molding chamber is also reduced and the synthetic resin coating material is brought into close contact with the molding chamber. Therefore, no matter how thick the plastic coating film is, the synthetic resin coating material is adhered to the inner surface of the molding chamber to be cured, and the surface can be beautifully molded. Therefore, for example, a thick plastic coating film is formed on the surface of the object to be coated, as shown in FIG. 6, and if necessary, a three-dimensional uneven pattern is provided on the surface of the object to be coated with the plastic film. You can also

Further, the surface coating method of the object to be coated according to the present invention can coat a beautiful plastic coating film easily, easily, and efficiently and neatly without requiring a high technology. This is because the plastic coating film is formed on the surface of the object to be coated with a mold. In the surface coating method of the object to be coated of the present invention, the surface condition of the molding 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 process of polishing the coated surface with paper can be minimized. This is because the molded plastic coating film can be mirror-finished in the state of being molded by the molding chamber. In the conventional coating method using a spray gun, it was necessary to spray a synthetic resin coating material using the gun to cure the coating material, and then polish the surface with paper to give a mirror-like finish. This work is extremely labor intensive, and is a very bad working environment in which dust is scattered. The method of the object to be coated 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 an excellent working environment, which is incomparable to the conventional coating method using a 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 sprayed from the spray gun, its vaporized substances, or airborne particles.
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, according to the surface coating method of the object to be coated of the present invention, the synthetic resin coating material is cured inside the molding chamber and can be prevented from scattering in 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 particles are scattered in the air and attached to the surface of the object to be coated. In the surface coating method of the object to be coated 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%. In the method for coating an object to be coated of the present invention, the use efficiency of the coating material can be 80% or more, and the coating material used is substantially reduced to 1/4 to form a surface coating material having the same thickness. can do. This can reduce the cost of the coating material and also simplify the disposal of the unused coating material. The painting method using a spray gun is
It is necessary to remove the unused paint and incinerate it,
Disposal is time-consuming and expensive. 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 cured while being connected to the object to be coated, 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 object to be coated temporarily fixed in the molding chamber can be maintained in a shape that repairs distortion and cracks. In this state, when the surface is coated with the plastic coating film, the plastic coating film on the surface cures while reinforcing the object to be coated. Particularly, according to the method of coating the surface of the article to be coated of the present invention, the plastic coating film can be thickened and the use efficiency of the coating material is extremely high. Therefore, a thick plastic coating film can be formed on the surface without increasing the coating cost. The thick plastic coating film strongly reinforces the surface of the object to be coated and prevents distortion and cracking.

It is possible to mold a thick plastic coating film once. 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 article to be coated of the present invention is not limited by the thickness of the plastic coating film to be molded. 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.

Further, according to the surface coating method of the object to be coated of the present invention, a three-dimensional uneven pattern can be provided on the surface in the coating step. In the conventional coating method using a spray gun, it is necessary to form an uneven pattern on the object to be coated in order to form an uneven pattern on the surface. For this reason, it is troublesome to manufacture an article to be coated with an uneven woodwork product. In the surface coating method of the article to be coated of the present invention, the surface of the plastic coating film can be molded 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. In the conventional coating method in which a three-dimensional pattern is formed on an object to be coated and a paint is sprayed thereon, it is necessary to polish the plastic coating film with paper after the synthetic resin 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 is a cross-sectional view of the door shown in FIG.

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.

FIG. 7 is a cross-sectional view of a mold for molding a frame.

8 is a cross-sectional view showing a state in which the rubber-like elastic body is crushed by pressing the mold shown in FIG.

FIG. 9 is a cross-sectional view of a mold used in a method according to another embodiment of the present invention.

FIG. 10 is a sectional view of a mold used in a method of another embodiment of the present invention.

FIG. 11 is a sectional view of a mold used in a method of another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Wood 2 Plastic coating film 3 Mold 4 Molding chamber 4A Molding gap 5 Supply hole 6 Frame 7 Exhaust hole 8 Rubber-like elastic body 9 Stepped portion 10 Stopper 11 Open / close valve 12 Rod 12A Collar 13 Spring 14 Collar 15 Fastening member

Claims (2)

[Claims] 1. A predetermined molding gap (4
A) A synthetic resin paint that is temporarily fixed in a molding chamber (4) where it can be clamped, and then cured in this molding chamber (4) without being externally heated, and in liquid or paste form without heating. Is injected, the mold (3) is held in a clamped state, the injected synthetic resin paint is cured to form a plastic coating film (2), and then the mold is removed from the molding chamber ( When the curing reaction of the synthetic resin paint injected into 4) progresses and the volume decreases, and the synthetic resin paint can be deformed, the volume of the molding chamber (4) is reduced to put the synthetic resin paint in the molding chamber.
(4) A surface coating method, characterized by holding and curing the inner surface in close contact with the inner surface. 2. An object to be coated is provided with a predetermined molding gap (4
A) A synthetic resin paint that is temporarily fixed in a molding chamber (4) where it can be clamped, and then cured in this molding chamber (4) without being externally heated, and in liquid or paste form without heating. Is injected, the mold (3) is held in a clamped state, the injected synthetic resin paint is cured to form a plastic coating film (2), and then the mold is removed from the molding chamber ( In the state where the curing reaction of the synthetic resin paint injected in 4) progresses and the volume decreases, and the synthetic resin paint can be deformed, press the uncured synthetic resin paint into the molding chamber (4),
Molding chamber whose volume is reduced by press-fitting synthetic resin paint
(4) A surface coating method, characterized in that the synthetic resin coating material inside is kept in close contact with the inner surface of the molding chamber (4) and cured.