JP5492406B2 - Resin molded product coating method and resin molded product - Google Patents

Description

The present invention relates to a resin molding product coating method used for automobile interior parts, furniture products, and the like, and a resin molding product that has been surface-coated by this method. The present invention relates to an improvement in surface coating that firmly protects (skin layer).

In general, decorative panels are widely used as furniture such as various furniture, interior products such as automobiles, or exterior materials such as home appliances. Such a decorative panel is made of resin, metal, or the like so that it can be easily processed, has little shape change, and has a mechanical strength suitable for the purpose.
For example, a reinforcing metal is inserted into a resin molding material to produce a base material (core material) plate with mechanical strength and dimensional accuracy suitable for the application, and a decorative sheet is attached to the plate surface to give an exterior design. Yes.

In such a decorative panel, it is known that a slice of natural wood (honk veneer) is adhered on a resin substrate as a decorative sheet to emphasize the speciality of the exterior design. For example, Patent Document 1
Has proposed a panel manufacturing method in which interior panels such as installation panels for automobiles and console panels are decorated in natural wood. This document discloses that a natural wood veneer is stuck on a resin material (base material) to decorate the surface of the panel in a wood grain.

In Patent Document 1, a decorative plate is made by molding a synthetic resin or the like, a base plate is created, a skin sheet having a wood grain pattern is bonded on the base plate with an adhesive, and the uppermost layer is coated with a transparent synthetic resin. It is disclosed. The document does not disclose in detail how to apply the surface coating layer, but as a decorative sheet, a film veneer (200-500 μm) is bonded to the reinforcing material such as a veneer plate with an adhesive. Then, a transparent sheet (PC: polycarbonate) is placed on the veneer via an adhesive (acrylic resin adhesive).
Is glued.
JP 2001-246717 A

As described above, a decorative panel manufacturing method in which a decorative sheet is attached to the surface of a panel substrate such as a resin and an overcoat layer is formed on the uppermost layer is made of a base plate made of resin, metal, etc. A method of producing the decorative sheets to be created in separate processes is adopted. The decorative sheet has a printed pattern or natural material pattern on the surface of an intermediate reinforcing material such as a resin, and the top surface is coated with a transparent resin or the like.

Thus, the following problems arise in the manufacturing method in which the base plate and the cover sheet are individually manufactured in separate steps, and finally both are bonded with an adhesive. The decorative film is formed by printing on a sheet or processing a natural material such as a wood material into a sheet shape, and the sheet is formed of an extremely thin material so as to fit a complicated shape. For example, even a wood grain sheet
The thickness is about 0.2 mm to 0.5 mm, and the panel substrate is required to be adhered so that no wrinkles, irregularities, or cracks are generated.

Therefore, when a decorative film made of an extremely thin material is attached to the panel substrate with an adhesive,
The decorative film (skin layer) easily peels off and is distorted and curled. Further, wrinkles, cracks, pinholes or irregularities occur, and the surface smoothness is impaired.
For example, if the surface smoothness such as wrinkles and unevenness is impaired on the surface of the panel base material, even if the degree is very fine, it feels abnormal when the user touches the surface, and the skin layer is a natural material In such cases, the sense of depth is impaired.

Thus, conventionally, a transparent coat layer is formed on the surface of the decorative sheet by applying, printing, bonding, etc., and this decorative sheet is adhered to the panel base material with an adhesive or the like. There was a problem that wrinkles, irregularities, pinholes, etc. were generated on the decorative sheet itself including the coating layer.
At the same time, since the transparent coat layer is formed by a process such as coating and printing, it is formed with a relatively thin layer and the appearance after adhesion is lost in depth. Further, when this layer is formed thick, cracks occur during the bonding process to the panel substrate, or the transparent coating layer is discolored due to internal distortion caused by distortion deformation.

Therefore, conventionally, when overcoating the outer surface of a panel base material having a skin layer formed of a natural material such as wood, either the following first or second method has been adopted. First of all, this overcoat has a problem that natural materials such as wood are exposed on the surface and peels off.
Prevents deterioration and deterioration due to light and chemicals. For this reason, as an overcoat agent,
It is required to protect the skin layer of a natural material or the like with strength so as not to be peeled off or distorted, and at the same time to protect (guard) the skin layer so as not to be deformed or altered by heat, light, moisture, chemicals, or the like.

As this overcoat method, a first method conventionally employed is a method in which a coating sheet is adhered to a panel substrate (a base member and a natural skin material adhered) prepared in a predetermined process. This coating sheet is a method in which, for example, a transparent coating layer is formed on a transparent resin film by silk printing or the like, and this coating sheet is applied to the substrate surface by pressurizing or heating. In the coating method in which such a coating sheet is adhered to the substrate surface, it is difficult to completely fit the substrate surface having a complicated shape such as unevenness, and wrinkles and unevenness may occur. In order to prevent this, heating and sticking the sheet causes a problem that the surface of the natural material is altered.

As an overcoat method, a panel base material is accommodated in a mold, and a film forming gap is formed between the skin layer on the surface of the panel and the inner wall of the mold. A method of coating by coating a coating resin into the film forming gap is also known. In this case, conventionally, for example, a method of heating and injecting a thermoplastic resin, filling the substrate surface, and cooling and solidifying is also known. However, the skin material (for example, wood material) may be distorted or discolored by the temperature of the heated resin.

Therefore, as a method of solidifying the overcoat agent without heating, a method of solidifying by reacting a resin material filling the film forming gap has been attempted. In this case, when filling a resin material having a predetermined overcoat performance into the mold, for example, it has been proposed that the liquid A and the liquid B are mixed immediately before filling. However, if the resin material is mixed and injected immediately before filling the film formation gap, the coating material starts to harden during the injection process, causing a problem that the film does not surely penetrate into the film formation gap.

Therefore, the present inventor processed the base plate into a shape according to the application, stuck a cover sheet thereon, and then formed a transparent coat layer on the cover sheet by injection molding on the surface. The inventor has come up with the idea that surface smoothness can be obtained by preventing generation of wrinkles, irregularities, cracks, and the like.

In this case, when the coating agent is injected into the mold and a coating layer is formed on the surface of the internal substrate plate, (1) the surface coating layer is free from wrinkles, irregularities, and cracks; (2) the surface A coating layer is formed with a predetermined thickness to form a coating that is rich in waterproofness, friction resistance, and acid resistance (chemical resistance), and when the injection-coated coating layer is solidified (3) It has been clarified that no change in color or deterioration occurs due to a change in humidity, and (2) no change in color or deterioration of the coating layer due to a chemical change.

The present invention provides a coating method capable of forming a coating layer of a transparent resin on the surface of a base plate and forming the coating layer with a uniform thickness and at the same time a smooth surface. Is the issue.
Furthermore, in the present invention, after forming a coating layer by injecting and injecting a material having fluidity into a mold, there is no heat treatment or chemical change when solidifying the coating layer. It is an object of the present invention to provide a coating method in which the surface layer is not discolored or deteriorated.

In order to achieve the above-described problems, the present invention employs the following means. In the present invention, the “one-component curable composition” means that one fluidity can be obtained without mixing and curing two or more fluid substances when curing a fluid coating agent. It refers to a substance that hardens a substance (including a composition) by irradiation with light (such as ultraviolet light, infrared light, or visible light). In the present invention, a substrate such as a resin or a metal is formed into an appropriate shape, and a surface plate is formed on the surface of the substrate by bonding, coating, printing, or the like to create a substrate plate. Next, the base plate is accommodated in a mold and a liquid coating agent is injected from an injection port. Thereafter, the coating layer is cured by irradiating the mold with light from the outside. At this time, the molding die (1) forms a film-forming gap having a substantially uniform thickness between the inner wall surface and the surface of the base plate accommodated therein, and (2) the above-mentioned At least a part of the film-forming gap is made of a light-transmitting material so that light is irradiated from the outside.
The coating agent is (1) a one-component curable composition having fluidity that can be filled in the film-forming gap, and (2) from a liquid by irradiating ultraviolet rays and / or electromagnetic radiation. It is comprised with the composition hardened | cured to solid.

The present invention is a method of forming a coating layer (20) on the surface of a substrate plate (10), and a substrate plate is formed by forming a surface (12x) on the surface of a substrate formed in an appropriate shape. A step of storing the base plate in a mold, and a liquid coating agent is injected from an injection port (33) provided in the mold to form a coating layer on the surface of the base plate. The forming step and the step of irradiating the molding die with light from the outside to cure the coating layer.

The mold includes (1) its inner wall surface (31x) and the base plate (
10) A film forming gap (20G) having a substantially uniform thickness is formed between the outer surface (12x) and (2) at least part of the film forming gap so that light is irradiated from the outside to the film forming gap. The coating agent is composed of a light-transmitting material, and (1) it is a one-component curable composition having fluidity that can be filled in the film-forming gap, and (2) ultraviolet rays and / or electromagnetic radiation. It comprises a composition that cures from a liquid to a solid upon irradiation.

The method for coating a resin molded product according to claim 1, wherein a supply tank (36) for the coating agent is connected to an injection port (33) provided in the mold through a supply pipe. The supply tank is provided with a pressurizing pump means (35) for pressurizing the coating agent and guiding it to the inlet.

The molding die includes the film forming gap between a core mold (30) having a recessed portion (30U) for accommodating the base plate (10) and a surface of the base plate accommodated in the recessed portion. The cavity mold and the core mold are configured to be connectable so as to be airtight, and the internal gas is decompressed in the film formation gap. In this way, the vacuum pump means (40) is electrically connected.

The surface (12x) of the base plate (10) is formed by sticking a wood grain sheet generated from natural wood to the base.

The molding die includes the film-forming gap (between the core mold (30) having a recessed portion (30U) for accommodating the base plate (10) and the surface of the base plate accommodated in the recessed portion. 20G), and a cavity mold (31) that covers the cavity mold, and at least a portion of the cavity mold that faces the film formation gap is formed of glass or a translucent resin. The core type, steel, composed of either stainless and aluminum alloys.

The core mold (30) is made of steel, and the recess (30U) that accommodates the base plate (10) is surface-treated with hard chrome plating.

The coating agent is a polyurethane resin or an acrylic resin, contains a sensitizer sensitive to ultraviolet rays as a component thereof, and is injected into the mold without being mixed immediately before.

The mold is equipped with heating means (41) for heating the coating agent injected therein, and this heating means is injected into the mold when it is irradiated with ultraviolet rays and / or electromagnetic radiation. Heat the coating agent.

It is a resin molded product , and a base plate (10) in which a surface is formed on the surface of a resin base formed in an appropriate shape, and a transparent or translucent coating layer covering the surface on the base plate ( 20), and the coating layer is formed by injecting a photocurable one-component coating agent onto the surface of the base plate housed in the mold, and then applying ultraviolet rays and / or from the outside of the mold. Or it forms by irradiating electromagnetic radiation and hardening | curing a coating agent.

A coating apparatus for forming a coating layer (20) on the surface of a resin molded product, a mold having a recess (30U) capable of accommodating a base plate (10) therein, and a liquid to be injected into the mold And a light emitting device (41) that emits ultraviolet rays and / or electromagnetic radiation to cure the coating agent injected into the mold,
(1) The inner wall surface (31x) and the outer surface (12x) of the base plate accommodated therein
And (2) at least part of the film-forming gap is made of a light-transmitting material so that light is irradiated from the outside to the film-forming gap. The coating agent is (1) a one-component curable composition having fluidity capable of filling the film-forming gap, and (2) liquid to solid by irradiation with ultraviolet rays and / or electromagnetic radiation. Consists of a curable composition.

The present invention is a one-component ultraviolet-curing type (and / or electromagnetic radiation-curing type) in which a surface is formed on a substrate having an appropriate shape according to the application, and the surface of the substrate plate is injected into a mold. Since the film is formed with a coating agent and then cured by irradiating ultraviolet rays (and / or electromagnetic radiation) from the outside of the mold, it has the following characteristics.

A predetermined film-forming gap is formed between the mold and the surface of the base plate contained in the mold, and the coating agent is injected into this gap and then photocured. , No cracks occur. Therefore, the surface coating layer coats the surface of the base plate in a state that is rich in smoothness and airtightness, and exhibits excellent properties of waterproofness and chemical resistance. At the same time, the surface coating layer can obtain the aesthetics, particularly the depth, of the surface by controlling the thickness of the film formation gap.

Further, since the coating agent is composed of a one-component composition, there is no chemical reaction when solidifying from a liquid to a solid, and the transparency and homogeneity of the surface coating layer can be ensured.

Furthermore, when the coating agent is injected into the mold, bubbles are included when the coating agent is injected by reducing the film forming gap (space) formed between the inner wall of the mold and the surface of the substrate plate to a vacuum state. There is nothing to do. The generation of bubbles can be further prevented by pressurizing and injecting the coating agent from the inlet simultaneously with the pressure reduction of the film forming gap.

Hereinafter, the present invention will be described in detail based on the preferred embodiments shown in the drawings. FIG. 1 shows a resin molded product A according to the present invention, (a) is a perspective view showing its appearance, (b) is an explanatory view of a cross-sectional structure,
(C) is explanatory drawing of a laminated structure. 2 is an explanatory view of the overall configuration of the coating apparatus B, FIG. 3 (a) is an explanatory view of the xx cross-sectional structure, and FIG. 3 (b) is a portion of the A section shown in FIG. FIG. 4 is an enlarged view, and FIG. 4 shows a YY longitudinal sectional view in a direction orthogonal to FIG. Hereinafter, the present invention will be described in the order of “resin molded product”, “coating method”, and “coating apparatus”.

[Resin molded product]
First, the resin molded product A of the present invention will be described. A resin molded product A shown in FIG. 1 includes a base plate 10 and a coating layer 20 formed on the surface of the base plate 10. The base plate 10 includes a base 11 and a front surface 12 formed on the surface of the base 11.

The base material 11 is formed of a synthetic resin, metal, or the like, and is formed in a shape corresponding to an application such as an interior panel. The illustrated base material 11 is formed into a plate shape by molding with a synthetic resin, and a metal reinforcing material (not shown) is inserted therein so as to suit the application. The base material 11 is configured in a material and shape suitable for applications such as metal, wood, and woven fabric in addition to resin.

The front surface 12 forms a decorative surface directly on the surface of the base material 11 by plating, painting, printing, or the like (surface treatment; first embodiment), or a decorative sheet 12S is bonded to the surface of the base material 11 Adhere with the agent 13b. The illustrated resin molded product A shows a case where a decorative sheet 12S is adhered to the base material 11 with an adhesive 13b as shown in FIG. 1 (c).

The decorative sheet 12S is made of a flexible sheet film material. A skin material 12b is adhered to the reinforcing plate 12a with an adhesive 13b. The reinforcing plate 12a is composed of, for example, a veneer plate, a nonwoven fabric, a resin film, or the like. The illustrated reinforcing plate 12a is a veneer plate having a thickness of 0.5 mm. The skin material 12b is composed of a film material in which a surface (design surface) 12x is formed by printing or the like, or a natural material slicing material. In the illustrated example, the skin material 12b is formed of a natural wood grained seat. For this reason, the skin material 12
“b” is made of a material obtained by slicing natural wood into a plate shape with a thickness of 200 to 500 μm. The skin material 12b is bonded to the reinforcing plate 12a with an adhesive 13b.

In addition to the above, the decorative sheet 12 may be composed of the skin material 12b alone without using the reinforcing plate 12a, but in this case, the skin material 12b is easily deformed and has a predetermined mechanical strength. Must be selected. The surface sheet may be formed of natural wood, or a thin plate (flexible flannel sheet) may be formed of a material according to the intended use, such as metal or carbon, and the cover sheet may be formed of the thin plate.

Next, the coating layer 20 will be described. As described above, the cover sheet layer 12S is adhered to the surface of the substrate 11 such as a resin. The cover sheet 12S is covered with a transparent (semi-transparent) coating layer 20. Therefore, a polymer is applied to the surface of the substrate 11 that has been surface-finished. This polymer is, for example, a transparent polymer such as an acrylate polymer, and a material having a high expansibility. As shown in FIG. 1C, the polymer layer 12p is formed on the cover sheet layer 12S.
Apply. The polymer layer 12p is made of a transparent resin material and has a thickness (tmm). The material and coating thickness (film thickness) of the polymer layer are condensed when the coating layer 20 described later is cured with UV light. The polymer layer material (especially expansion / contraction characteristics) and coating thickness are experimentally determined so that voids are not generated between the outer surface and the coating layer 20 due to the condensation of the coating layer 20.

Therefore, the coating layer 20 is formed on the uppermost layer of the base plate 10 formed in a predetermined shape. The coating layer 20 is made of a resin material that is transparent or translucent to the extent that the surface 12x described above is exposed to the outside. This resin material (hereinafter referred to as “coating agent”) is (1) injection molded into a film forming gap 20G formed between the surface of the substrate plate 10 and an inner wall of a mold (described later). The coating agent is composed of a photocurable one-component resin material.

[Coating equipment]
Next, the coating apparatus B shown in FIGS. 2 and 3 will be described. The coating apparatus B includes a core mold 30 and a cavity mold 31, and the cavity mold 31 is formed with a recessed portion adapted to the outer diameter shape of the base plate 10. A film forming gap 20G is formed between the inner mold wall 31x and the surface 12x of the base plate 10. This film forming gap 20G is set in advance to the thickness of the coating layer formed on the surface of the base plate 10. Core type 30
In addition, recessed grooves corresponding to the shape of the base plate 10 are formed.

The cavity mold 31 is provided with a step flange 31f (see FIG. 3B) on the base plate 10.
The base plate 10 is sandwiched between the core mold 30 and the cavity mold 31 by this stepped flange. 38 is a clamping bolt. As shown in FIG. 2, an injection nozzle 33, an inflow path 34, a compressor 35, and a coating agent storage tank 36 are connected to the film forming gap 20G formed between the core mold 30 and the cavity mold 31 in this way. .

Accordingly, by operating the compressor 35, the liquid coating agent stored in the tank is pressurized by the compressor 35 and flows into the film forming gap 20G from the injection nozzle 33.

Further, the film forming gap 20G formed between the core mold 30 and the cavity mold 31 described above.
Is provided with a discharge port 37, which is connected to a vacuum pump 40 via an outflow path 39.
Are connected. Therefore, by operating the vacuum pump 40, the deposition gap 2
The gas staying in 0G flows out from the discharge port 37 to the outside.

As shown in FIG. 2, the injection nozzle 33 and the discharge port 37 formed in the film-forming gap 20G have the coating agent injection port (nozzle 33) at the lowest end in the direction of gravity (see arrow in FIG. 2). The discharge port 37 is set at the uppermost end in the direction of gravity action. Accordingly, the bubbles generated in the film forming gap 20G rise upward in the antigravity direction, and at the same time, the inside of the cavity is decompressed to be in a vacuum state. Therefore, the bubbles are removed from the discharge port 37 through the outflow path 39 to the outside of the mold.

The cavity mold 31 can irradiate the film forming gap 20G with ultraviolet rays.
At least a portion facing the film forming gap 20G is made of transparent glass (for example, quartz glass) or a translucent material. 3y shown in FIG. 3 shows the translucent window. Therefore, as described above, the film forming gap 20G formed by the cavity mold 31 and the core mold 30 is provided with a light transmitting window 31y so that light can be irradiated from outside the mold, and the outside of the light transmitting window 31y. Is provided with an ultraviolet lamp (UV lamp) 41. Then, after the film forming gap 20G is filled with a coating agent, the UV lamp 41 is energized to irradiate the film forming gap 20G with ultraviolet light.

Since the coating agent irradiated with ultraviolet light from the UV lamp 41 contains an ultraviolet absorber and an ultraviolet curing agent as described above, the coating agent is solidified from a liquid state to a solid upon receiving UV rays (for example, a wavelength of 300 nm). Thus, the coating layer 2 which has a photoinitiator hardened | cured with an ultraviolet-ray
0 does not fade even when exposed to ultraviolet rays for a long time after molding.

The detailed structure of the coating apparatus B described above will be described. As shown in FIG. 2, the longitudinal direction (longitudinal direction) of the substrate plate 10 is set up and down, and the molds (core mold 30 and cavity mold 31) are installed vertically and vertically. The injection nozzle 33 is disposed on the lower end side and the discharge port 37 is disposed on the upper end side with reference to the direction of gravity action. At this time, a check valve (not shown) is provided in the inflow path 34 connected to the injection nozzle 33. The compressor 35 is composed of a normal discharge pump, pressurizes the liquid coating agent in the coating agent storage tank, and guides it to the injection nozzle 33.

As described above, the discharge passage 37 is connected to the discharge port 37, and a vacuum pump 40 is disposed in this passage. The outflow path 39 is provided with a check valve (not shown). The injection nozzle 33 and the discharge port 37 are arranged at a position communicating with the film forming gap 20G. Therefore, the gas in the film forming gap is sucked from the discharge port 37 by the vacuum pump 40, and
A coating agent is introduced from the injection nozzle 33. Therefore, even if bubbles are included in the coating agent flowing into the film forming gap, the bubbles are removed from the discharge port 37 to the outside of the mold by the vacuum pump 40. As a result, no bubbles or the like are generated in the coating layer 20 formed by filling the film forming gap 20G and then photocuring.

[Coating method]
Next, the coating method of the present invention will be described with reference to the process explanatory diagram of FIG. First, the coating method of the present invention includes a “material plate forming process” and a “coating layer forming process”.

"Material plate making process"
In the material plate creation step, the cover sheet 12S is formed by slicing a natural material, for example, natural wood. The cover sheet 12S is formed to have a flexible and flexible thickness (St11). The reinforcing plate 12a is created in parallel with the creation of the cover sheet 12S (St1
2). The reinforcing plate 12a is used for mechanical reinforcement for supporting the cover sheet 12S as a backup, and at the same time, for preventing deterioration of the cover sheet 12S. In the figure, the decorative sheet 12S is formed of a wood sheet, and the reinforcing plate 12a is formed of a veneer plate in order to maintain the durability of the wood sheet.

Next, the cover sheet 12S is adhered to the reinforcing plate 12a with an adhesive 13b. At this time, pressure is applied in a heated state as necessary. Then, the reinforcing plate 12a and the cover sheet 12S are overlapped with each other and integrated into a film shape (St13). Thus, the reinforcing plate 12a composed of wood
Will protect the cover sheet 12S composed of the main grain so as to be backed up with the same material by water retention and temperature and humidity changes.

Next, the base material 11 is created (St14). The base material 11 is formed into a shape corresponding to the intended use by resin molding or the like. For example, in the case of an interior panel such as an automobile, the substrate is formed into a shape according to the purpose. At this time, the reinforcing material is in-molded as necessary. Then, the cover sheet 12S is attached to the surface of the base material 11 formed in the shape and mechanical strength according to the purpose.
Attach with b (St15). In this state, the base material 11 that is surface-finished is completed (St20a).
). A resin polymer is applied to the surface of the substrate 11 to form a polymer surface film (St
20b).

"Coating layer formation process"
Next, the coating layer forming step forms the coating layer 20 on the surface of the substrate plate 10 described above. Therefore, the mold is composed of the cavity mold 31 and the core mold 30 as described above.
It is integrated with a clamping bolt 38. Therefore, the cavity mold 31 and the core mold 30 are separated (St21). Next, the substrate plate 10 is accommodated and set in the recessed portion 30 </ b> U of the core mold 30, and the top of the substrate plate 10 is covered with the cavity mold 31. At this time, the step flange 31f of the cavity mold 31 abuts and regulates the surface 12x of the substrate plate 10, and this surface 1
A film forming gap 20G is formed between 2x and the mold inner wall 31x.

The core mold 30 and the cavity mold 31 are integrally clamped by the mold clamping bolt 38, and the airtightness of the film forming gap 20G is maintained (St22). Next, the aforementioned one-component coating agent is prepared for storage in the coating agent storage tank 36. At this time, the temperature of the coating agent is controlled to a predetermined temperature, for example, 38 ° C. (St23). Next, the vacuum pump 40 is operated to suck the gas in the film forming gap 20G to form a vacuum state (St24). Therefore, the compressor 35 is operated to inject the coating agent into the film forming gap.

The coating layer 20 having a predetermined thickness is formed on the surface of the base plate by the injection of the coating agent into the film forming gap 20G and the operation of the vacuum pump 40 (St25). At this time,
No bubbles are formed in the coating layer. Next, the transparent window 31y of the cavity mold 31
Then, ultraviolet rays are irradiated (St26). The coating agent filled in the film forming gap 20G is cured by this ultraviolet irradiation, and changes from a liquid to a solid. After the curing, the base plate 10 is taken out from the mold and the coating process is finished (St27).

The resin molded product concerning this invention is shown, (a) is a perspective view which shows the external appearance, (b) shows explanatory drawing of sectional structure, (c) is explanatory drawing of laminated structure. Explanatory drawing of the whole structure of the coating apparatus concerning this invention. FIGS. 3A and 3B are explanatory diagrams of a main part of the apparatus of FIG. 2, in which FIG. 2A is an explanatory diagram of a sectional structure of FIG. Explanatory drawing of the YY longitudinal cross-section of the apparatus of FIG. Process explanatory drawing of the coating method concerning this invention.

Explanation of symbols

A Resin molded product B Coating device 10 Substrate plate 11 Substrate 12x Surface 12a Reinforcement plate 12b Skin 12S Surface sheet 13b Adhesive 20 Coating layer 20G Film formation gap 30 Core mold 30U Recessed part 31 Cavity mold 31x Inner wall 31y Translucent Window 31f Step flange 33 Injection nozzle 34 Inflow path 35 Compressor 36 Coating agent storage tank 37 Discharge port 38 Clamping bolt 39 Outflow path 40 Vacuum pump 41 Ultraviolet lamp (UV lamp)

Claims (11)

A method of forming a coating layer on the surface of a substrate plate,
Forming a surface plate on the surface of the substrate formed into a suitable shape to create a substrate plate;
Storing the base plate in a mold,
Injecting a liquid coating agent from an inlet provided in the mold and forming a coating layer on the surface of the base plate;
Curing the coating layer by irradiating the mold with light from outside;
Consisting of
The mold is
(1) forming a film-forming gap having a substantially uniform thickness between the inner wall surface and the surface of the base plate housed therein;
(2) At least part of the film-forming gap is made of a light-transmitting material so that light is irradiated from the outside.
The coating agent is
(1) A one-component curable composition having fluidity capable of filling the film-forming gap,
(2) A composition that cures from a liquid to a solid by irradiation with ultraviolet rays and / or electromagnetic radiation,
A method for coating a resin molded product, comprising: It is a coating method of the resin molded product according to claim 1,
A supply tank of the coating agent is connected to an injection port provided in the mold through a supply pipe,
The supply tank is provided with a pressurizing pump means for pressurizing the coating agent and guiding it to the inlet. It is a coating method of the resin molded product according to claim 1,
The mold is
A core mold having a recessed portion for accommodating the base plate;
A cavity mold that covers the surface of the base plate housed in the recess so as to form the film-forming gap;
Consists of
The cavity mold and the core mold are configured to be connectable so as to have airtightness ,
The film forming gap is characterized by being connected to a vacuum pump means so as to depressurize the internal gas. It is a coating method of the resin molded product according to claim 1,
The surface of the base plate is formed by attaching a cover sheet to the base. It is a coating method of the resin molded product according to claim 1,
The mold is
A core mold having a recessed portion for accommodating the base plate;
A cavity mold that covers the surface of the base plate housed in the recess so as to form the film-forming gap;
Consists of
In the cavity mold , at least a portion facing the film forming gap is formed of a light-transmitting material. A method for coating a resin molded product according to claim 5,
The core mold is made of any one of steel, stainless steel, and aluminum alloy. A method for coating a resin molded product according to claim 5,
The core mold is made of steel, and a concave portion that accommodates the base plate is surface-treated with hard chrome plating. It is a coating method of the resin molded product according to claim 1,
The coating agent is
It is a composition mainly comprising a polyurethane resin or an acrylic resin. It is a coating method of the resin molded product according to claim 1,
The coating agent is
It contains a sensitizing substance sensitive to ultraviolet rays as its component, and is injected into the mold without being mixed immediately before. It is a coating method of the resin molded product according to claim 1,
The mold is equipped with a heating means for heating the coating agent injected therein,
This heating means heats the coating agent injected into the mold at a predetermined temperature when the mold is irradiated with ultraviolet rays and / or electromagnetic radiation. A resin molded product ,
A base plate in which a surface is formed on the surface of a resin base formed in an appropriate shape;
A transparent or translucent coating layer covering the surface of the substrate plate;
Consisting of
The coating layer is
Injecting a photocurable one-component coating agent on the surface of the base plate contained in the mold,
Next, the coating agent is cured by irradiating ultraviolet rays and / or electromagnetic radiation from the outside of the mold.
The resin molded product characterized by being formed by this.

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