JP2002067589A - Manufacturing method for display plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent convection of dye in a receiving layer and to maintain the quality of an image. SOLUTION: In the present manufacturing method of a display plate, transfer paper whereon the image is formed by printing with ink of sublimation dye is placed on the receiving layer of the base of the display plate and the image on the transfer paper is transferred onto the plate under heat and pressure. The method has processes of forming the receiving layer on the base of the display plate (a), hardening the receiving layer by heating (b), grinding the surface of the hardened receiving layer (c), transferring the color image from the transfer paper under heat and pressure (d), heating the receiving layer so as to erase transfer dots (e), hardening the receiving layer by heating (f), grinding the surface of the receiving layer (g), forming a transparent protective film layer on the upper surface of the receiving layer (h), hardening the transparent protective film layer at a normal temperature (i) and grinding the upper surface of this layer (j). An ultraviolet absorber is dispersed at least in either the receiving layer or the transparent protective film layer. The convection of the dye due to heat is eliminated and the color image is clear and has a feel of depth and high grade and an excellent resistance to light.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transfer paper on which an image is formed by printing with a sublimable dye ink, which is superposed on a receiving layer of a display panel substrate, and the image of the transfer paper is heated and pressed. The present invention relates to a method for manufacturing a transferred display panel.

[0002]

2. Description of the Related Art Conventionally, painting using a sublimable dye ink,
Printing images such as photographic images, character images, and pattern images on transfer paper, and forming an image transferred from the image printed on the transfer paper on a receiving layer formed on an object to be transferred such as a metal plate or a glass plate. Had been done.

FIG. 5 is a cross-sectional view of a main part showing a method of transferring a color image to a receiving layer of a display panel substrate with a sublimable dye ink. In FIG. 5 (a), reference numeral 1 denotes a display board substrate which is a transfer object using various materials such as metal, plastic, fiber, glass, and the like, and 2 denotes a receiving layer made of polyurethane resin or the like. The receiving layer 2 is formed on the upper surface of the display panel substrate 1 by a printing method, a coating method, or the like. The binder of the receiving layer 2 uses a two-component polyurethane resin, but is not limited thereto.
Resins such as polyester resin, epoxy resin, and acrylic resin can be selected.

[0004] The surface of the receiving layer 2 is flattened to form a clear transfer image without coloring unevenness on the surface of the receiving layer 2. First, the surface of the receiving layer 2 is cured by heating using a heating device. The heating condition is about 180 ° C. × about 15 minutes.

[0005] The hardened surface of the receiving layer 2 is polished using a polishing device to finish it into a clean flat surface.

In FIG. 5B, a transfer paper 3 on which an image is printed with a sublimable dye ink is superimposed on the receiving layer 2 with the image facing downward, and heated and heated by a pressurizing device 4. When the color image is transferred to the surface of the receiving layer 2 under a pressure of, for example, about 180 ° C. and 10 g / cm ² for about one minute, the sublimable dye ink vaporizes and the dye penetrates into the receiving layer 2. Then, an image opposite to the image on the transfer paper 3 is transferred into the receiving layer 2.

In FIG. 5C, a color image is transferred and
A transparent protective film layer 5 is formed on the upper surface of the formed receiving layer 2 by printing or coating a transparent resin paint to protect the receiving layer 2. Here, the resin coating used for the transparent protective film layer 5 is obtained by mixing a curing agent or the like with a transparent polyurethane resin as a binder similarly to the receiving layer 2.

Finally, in order to cure the transparent protective film layer 5, a forced curing treatment was performed by heating at about 100 ° C. for about 30 minutes.

[0009]

However, the conventional display panel manufacturing method described above has the following problems. First, since the color image of the transfer paper is formed by an inkjet printer, it is made up of a collection of invisible dots, and the sublimable dyes in the form of dots are transferred to the receiving layer under heat and pressure. When it is transferred to the receiving layer, it is vaporized and penetrates into the receiving layer, but is transferred leaving a dot mark. In particular, in the case of a dark color, these dot marks are spotted and appear conspicuous.

Heating is performed to forcibly cure the transparent protective film layer. At this time, convection occurs in the dye, and the dye in the receiving layer permeates the transparent protective film layer to cause unevenness in the color image. There were problems such as affecting the quality and the quality of the display panel.

[0011] Therefore, there is a need for a display panel in which spots such as dot marks do not stand out and a dye does not penetrate the transparent protective film layer and does not disturb the image quality.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to eliminate spots of dot marks and to prevent the sublimable dye from permeating the transparent protective film layer without convection due to heat. The present invention provides a method for manufacturing a display panel having a clear and beautiful color image, in which the color of an image does not change even when used for a long period of time even when exposed to external light for a long time or when the external temperature fluctuates. is there.

[0013]

In order to achieve the above object, a method of manufacturing a display panel according to the present invention comprises the steps of superimposing a transfer paper on which an image is printed with a sublimable dye ink on a receiving layer of a display panel substrate. In addition, in a method of manufacturing a display plate on which an image of a transfer paper is transferred under heating and pressure, a step of forming a receiving layer on a display plate substrate, and a step of heating to cure the receiving layer, A step of polishing the surface of the cured receiving layer, a step of transferring a color image from transfer paper under heat and pressure, and a step of heating the receiving layer to erase transfer dots,
Heating to cure the receiving layer, polishing the surface of the receiving layer, forming a transparent protective film layer on the upper surface of the receiving layer, curing the transparent protective film layer at room temperature, and protecting the transparent protective film. Polishing the upper surface of the film layer.

Further, a transfer paper on which an image is formed by printing with a sublimable dye ink is superimposed on a receiving layer of a display panel substrate, and
In a method of manufacturing a display plate on which an image of a transfer paper is transferred under heat and pressure, a step of forming a receiving layer on a display plate substrate, a step of heating and curing the receiving layer, Polishing the surface of the layer, transferring the color image from the transfer paper under heat and pressure, heating the receiving layer to eliminate transfer dots, and heating to cure the receiving layer And a step of polishing the surface of the receiving layer.

Further, at least one of the receiving layer and the transparent protective film layer may be provided with 2- (3,5-di-t-butyl-2-human peroxyphenyl) benzotriazole or 2- (3-t-butyl-5). -Methyl-2-human peroxyphenyl) -5-chlorobenzotriazole or ultrafine zinc oxide. At least one kind of ultraviolet absorber is dispersed therein.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a display panel according to the present invention will be described with reference to the drawings. 1 and 3 show a display panel according to a first embodiment of the present invention. FIG. 1 is a cross-sectional view of a main part showing a configuration of a display panel, and FIG. 3 is a process diagram for explaining a manufacturing method thereof. In FIG. 1, the configuration of the display panel is the same as that of the prior art.
A color image of a sublimable dye transferred from transfer paper is formed in the receiving layer 2, and a transparent protective film layer 5 is formed on the upper surface of the receiving layer 2.

Referring to FIG. 3, a method of manufacturing the display panel having the above-described structure will be described. FIG. 3A shows a step of forming a receiving layer on a display panel substrate. The receiving layer 2 is formed on a display substrate 1 such as a metal by a printing method or a coating method. As the display board substrate 1 here, an aluminum plate or a brass plate is used for a timepiece dial, but it is not particularly limited to a metal plate.
Materials such as plastic, fiber, and glass can also be selectively used. In addition, the surface of the display board substrate may have been subjected to various decorative patterns such as a sunshine pattern or a stripe pattern,
Surface treatment such as plating and painting may be applied.

The receptor layer 2 is formed by mixing a polyisocyanate curing agent and a UV absorber described later using a polyurethane resin as a binder to form a paint and forming the coating by a printing method. The thickness of the receiving layer 2 needs to be at least 20 μm or more, and in this embodiment, it is formed to about 30 to 40 μm in consideration of polishing in a later step. Further, in the present embodiment, a polyurethane resin is used for the receiving layer 2, but the resin is not particularly limited, and another resin such as an acrylic resin or an epoxy resin can be used.

In this embodiment, 2- (3,5-di-t-butyl-2-human peroxyphenyl) benzotriazole is used as an ultraviolet absorber in the receiving layer 2 with respect to 100 parts by weight of the polyurethane resin.
Approximately 2.5 parts by weight are blended. When an ultraviolet absorbent is contained, the light fastness of the sublimable dye can be improved.
As the ultraviolet absorber, other than the above, 2- (3-t-butyl)
-5-Methyl-2-humanperoxyphenyl) -5-chlorobenzotriazole or ultrafine zinc oxide are effective.

FIG. 3B shows a step of heating to cure the receiving layer. Heating is performed at about 100 ° C. for about 15 minutes using a heating device. The reason why the receiving layer 2 is heated and cured is to polish the surface of the receiving layer 2 in a later step to finish it into a clean flat surface. The reason why the surface of the receiving layer 2 is made flat is that, when the receiving layer 2 is formed by the above-described printing method or coating method, a central hole or the like becomes clear like an outer peripheral end of the display panel substrate 1 or a timepiece dial. If it is present, the paint will accumulate around the center hole in a swollen form. In addition, the entire surface has some irregularities, and is not finished flat. In this state, if transfer is performed by applying pressure in a later step, a portion where a strong pressure is applied or a portion where a weak pressure is applied is generated, and a dark portion or a light portion is generated in the color coloring after the transfer, and coloring unevenness occurs. In order to eliminate this coloring unevenness, that is, to make the surface of the receiving layer 2 smooth so that a uniform pressure can be obtained.

FIG. 3C shows a step of polishing the surface of the cured receiving layer. As described above, the surface of the receiving layer 2 is polished to eliminate the coloring unevenness after the transfer, so that the surface of the receiving layer 2 is finished to a clean and smooth surface.

FIG. 3D shows a step of transferring a color image from transfer paper under heat and pressure. A transfer paper on which a color image has been formed is placed on the polished upper surface of the receiving layer 2, and the color image is transferred to the receiving layer 2 under heat and pressure. Here, a color image is formed by printing on transfer paper using an ink-jet printer using a sublimable dye ink as in the related art. This color image is formed by magenta (purple), yellow (yellow), cyan (light blue), and black (black) dye inks, and by dot printing on a white background of transfer paper with the ink of the required color. I do. For example, if you want to produce a green color, use two colors, yellow dye ink and light blue dye ink, and do not stack yellow dot print and light blue dot print on a white background of transfer paper. Obtained by printing evenly dispersed. The yellow-greenish color, the blue-greenish color, and the shades of these colors are determined by the set ratio of the yellow dot print area, the light blue dot print area, and the remaining area of the white background.

The dots of the dot printing are as large as visible or invisible, and the dots printed at about 1440 dpi are hardly visible. The color image here is applied to a single color, a painting, a photographic image, and other various things. The heating and pressurizing are performed by a pressurizing device having a heated pressing tool. In the present embodiment, the heating and pressurizing are performed for about one minute at about 180 ° C. and a pressure of 10 g / cm ² . Here, the heating temperature differs depending on the resin, and is set at a temperature around the softening point. The pressure is set depending on the depth of penetration of the dye, but if it is too large, the receptor layer may be pressed and deformed. As a result, the color image of the sublimable dye formed on the transfer paper is vaporized by heat, and the vaporized dye penetrates into the receiving layer 2 by the pressure and is transferred into the receiving layer 2 to form a color image. You.

FIG. 5E shows a step of heating the receiving layer in order to erase the transferred dots. The heating is performed for the purpose of causing the convection of the dye in the receiving layer 2. When the transfer is performed in the above-described process, the adjacent dot dyes in the receiving layer 2 are not sufficiently mixed and the dots are formed. Things happen. In particular, in the case of a dark color, it becomes spotty and conspicuous. Therefore, heating is performed again without pressurization. The heating here is performed at a considerably high temperature, for example, about 200 to 270 ° C. × 5 to 15 minutes in order to cause convection in a short time. As a result, convection of the dye occurs, and the dyes of the adjacent dots are sufficiently mixed to eliminate the spots, thereby obtaining a very beautifully toned color.

FIG. 5F shows a step of curing the receptor layer by heating. Further, the receiving layer 2 on which the color image has been formed is again heated and cured. The heating here is performed by heating at a relatively low temperature, for example, about 100 ° C. for a long time, for example, for about 30 minutes, in a state where the dye does not cause convection. The use of a heating device such as a far-infrared dryer is preferable because uniform curing can be obtained.

The purpose of curing the receiving layer 2 is to prevent the vaporized dye from escaping from the receiving layer 2 and to polish the surface of the receiving layer 2 in the next step to obtain a clean and smooth surface. That's why. At the same time, it also has the purpose of preventing the resin of the transparent protective film layer 5 formed on the upper surface of the receiving layer 2 from being dissolved in the receiving layer 2 in a later step.

FIG. 5 (g) shows a step of polishing the surface of the receiving layer. As described above, since the transfer from the transfer paper is performed by heating and pressurizing by the heating device, the receiving layer 2 is softened, and the impression of the transfer paper by the pressurization, for example, the trace of the paper pattern is formed on the surface of the receiving layer 2. The appearance quality of the attached display panel is impaired. Therefore, a color image with a beautiful surface can be obtained by polishing the surface of the receiving layer 2 with a polishing allowance that removes indentations.

FIG. 5H shows a step of forming a transparent protective film layer on the receiving layer. On the upper surface of the receiving layer 2 on which the color image has been transferred and formed, a transparent protective film layer 5 is formed to protect the receiving layer 2. The resin coating used for the transparent protective film layer 5 is a mixture of a transparent polyurethane resin binder, a curing agent, and the above-mentioned ultraviolet absorber, as in the case of the receiving layer 2. 30-50μ by printing, painting, etc. with this paint
m. This transparent protective film layer 5 is preferably not of a type that is heated and forcibly cured, but of a type that cures naturally at room temperature. Further, the transparent protective film layer 5 has a function of giving a high-grade image that looks submerged deeply into the color image when the color image below the transparent protective film layer 5 is viewed through the transparent protective film layer 5.・ It is effective. It is preferable to use the same resin as the paint in consideration of the adhesion to the receiving layer 2. The solvent used for the paint used here is preferably a solvent having a relatively low boiling point in consideration of natural curing at room temperature in the next step.

FIG. 5 (i) shows a step of curing the transparent protective film layer. Here, natural curing is carried out for a considerable period of time, for example, about two days and nights, while leaving it at room temperature to avoid convection of the dye. The purpose of curing the transparent protective film layer 5 is to obtain a clean and smooth surface by polishing the surface of the transparent protective film layer 5 in the next step, and to make the surface of the transparent protective film layer 5 scratch free by making it hard. This is to make it easier. In addition, the dye has a function and effect that makes it difficult for the dye to escape.

FIG. 5 (j) shows a step of polishing the surface of the transparent protective film layer. If the transparent protective film layer 5 is formed by printing or painting, the paint will accumulate on the outer peripheral portion and the like. In addition, since the surface lacks in appearance due to gentle unevenness, a beautiful glossy surface can be obtained by polishing the surface. The quality as a display board is improved.

As described above, by adopting the manufacturing method shown in FIGS. 5A to 5J, the convection due to the heat of the sublimable dye is eliminated, the dye does not soak into the transparent protective film layer, and a clear and beautiful color image is obtained. Is obtained. Further, since the color image is viewed through the transparent protective film layer, the color image looks submerged and the color image feels deep and feels luxurious.
In addition, since it contains an ultraviolet absorber, it has excellent light fastness, prevents deterioration of the sublimable dye due to ultraviolet light even when exposed to external light for a long period of time, and transfers the color image transferred to the receptor layer 2 to the initial state for a long period of time. It is possible to keep a beautiful color image.

FIGS. 2 and 4 show a display panel according to a second embodiment of the present invention. FIG. 2 is a cross-sectional view of a main part showing a configuration of the display panel, and FIG. 4 is a process chart for explaining a manufacturing method thereof. In FIG. 2, the structure of the display panel is such that the transparent protective film layer is not provided in the first embodiment described above.
That is, the receiving layer 2 is formed on the upper surface of the display panel substrate 1 made of metal or the like,
In the receiving layer 2, a color image of a sublimable dye transferred from transfer paper is formed. In the present embodiment, the receiving layer 2
Is formed thickly, and a sublimation dye for forming a color image is allowed to penetrate deeply from the surface of the receiving layer 2 (to a depth reaching the display panel substrate 1), so that a desired color can be obtained without forming a transparent protective film layer. A beautiful color image can be obtained.

Referring to FIG. 4, a method for manufacturing the display panel having the above configuration will be described. 4A to 4G correspond to FIGS. 3A to 3G described in the first embodiment.
The steps are exactly the same as those shown in FIG.

FIG. 4A shows a step of forming a receiving layer on a display substrate, in which a polyurethane resin is used as a binder and a polyisocyanate curing agent and an ultraviolet absorber are mixed with the display substrate 1 made of metal or the like. It is made into a paint, and the receiving layer 2 is formed by a printing method or a coating method. Here, the thickness of the receiving layer 2 is about 60 to 80 μm, which is larger than that of the first embodiment.

FIG. 4 (b) shows a step of curing the receptor layer by heating, in which the surface of the receptor layer 2 is polished in the next step to harden the receptor layer 2 so as to obtain a clean and smooth surface. .

FIG. 4 (c) shows a step of polishing the surface of the cured receiving layer. The surface of the receiving layer 2 is made smooth in order to eliminate color unevenness in color coloring of the color image transferred from the transfer paper. To obtain a uniform pressing force.

FIG. 4D shows a step of transferring a color image from transfer paper under heat and pressure.
Place the transfer paper on which the color image is formed on the top of
The color image is transferred to the receiving layer 2 under pressure. The heating and pressurizing conditions here are heating at about 180 ° C and 20 to 30.
Transfer is performed under a pressure of about 2 minutes under a pressure of g / cm ² . As compared with the first embodiment, the dye is applied to the receiving layer 2 by increasing the pressing force and setting the pressing time longer.
Can penetrate deep into the surface.

FIG. 4E shows a step of heating the receiving layer in order to erase the transferred dots.
By performing the reaction at 00 to 270 ° C. for about 5 to 15 minutes, the convection of the dye occurs, and the dye of the adjacent dots is mixed to obtain a toned color.

FIG. 4 (f) shows a step of curing the receptor layer by heating. In the next step, polishing is performed to obtain a clean and smooth surface, and in order to prevent the vaporized dye from escaping from the receptor layer 2. Is to be cured.

FIG. 4 (g) shows a step of polishing the surface of the receiving layer, in which a clear color image is obtained by polishing the surface of the receiving layer 2 to smooth the surface in order to remove indentations during transfer. Can be

As described above, by adopting the manufacturing method shown in FIGS. 4 (a) to 4 (g), the thickness of the receiving layer 2 is increased, and the dye is penetrated deep into the receiving layer 2 to form a color image. The escape of the dye from Step 2 is reduced, and the initial image quality is maintained for a long period of time. Further, since the dye penetrates deeply into the receiving layer 2, the upper layer of the receiving layer 2 has a reduced amount of the dye and is in a state close to a transparent state, and has the same effect as the provision of the transparent protective film layer.

Further, similarly to the first embodiment, since a UV absorbing agent is contained, it has excellent light fastness and prevents the sublimable dye from being deteriorated by ultraviolet rays even when exposed to external light for a long period of time. The transferred color image can keep a beautiful color image for a long period of time.

Of course, in the first embodiment,
The step of forming the transparent protective film layer and the subsequent steps, that is, the step of curing the transparent protective film layer and the step of polishing the upper surface of the transparent protective film layer can be omitted, and the cost can be reduced accordingly. .

Although the present invention has been described with respect to a method of manufacturing a display plate, the present invention is not limited to this, and a transfer image forming product such as a timepiece dial, a meter having a display unit, a communication device, or an office device may be used. The present invention can be similarly applied to equipment. Further, the present invention can be similarly applied to various nameplates, various seal plates, and the like.

[0045]

As described above, according to the method of manufacturing a display panel of the present invention, a step of curing a receiving layer after transferring a color image from transfer paper under heat and pressure is provided. To prevent convection. Therefore, the dye does not permeate into the transparent protective film layer, and a clear color image can be obtained. Further, since the color image is viewed through the transparent protective film layer, the color image appears to be sunk and the color image feels deep, so that a high-quality display panel can be obtained.

Further, since it contains an ultraviolet absorber, it has excellent light fastness and can maintain an initial beautiful color image for a long period of time.

Further, by forming the receiving layer thickly and allowing the dye to penetrate deep into the receiving layer, the escape of the dye is reduced and the initial image quality can be maintained for a long period of time. Further, since the dye penetrates deeply into the receiving layer, the upper layer of the receiving layer is reduced in the amount of the dye to a state close to a transparent state, and has the same effect as the provision of the transparent protective film layer. Therefore, the formation of the transparent protective film layer becomes unnecessary. In addition, since the receiving layer contains an ultraviolet absorber, it has excellent light fastness and retains an initial beautiful color image for a long period of time.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a main part showing a configuration of a display panel according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of a main part showing a configuration of a display panel according to a second embodiment of the present invention.

FIG. 3 is a process diagram illustrating a method for manufacturing the display panel of FIG.

FIG. 4 is a process chart illustrating a method for manufacturing the display panel of FIG.

FIG. 5 is an explanatory view showing a conventional display panel manufacturing method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Display board 2 Reception layer 5 Transparent protective film layer

Claims (3)

[Claims] 1. A display plate in which an image of a transfer paper on which an image is formed by printing with a sublimable dye ink is superimposed on a receiving layer of a display plate substrate, and an image of the transfer paper is transferred under heat and pressure. In the method, a step of forming a receiving layer on a display substrate, a step of heating to cure the receiving layer, a step of polishing the surface of the cured receiving layer, and a step of heating and pressing a color image from transfer paper Transfer step, heating the receiving layer to erase transfer dots, heating and curing the receiving layer, polishing the surface of the receiving layer, and forming a transparent layer on the upper surface of the receiving layer. A method for manufacturing a display panel, comprising: a step of forming a protective film layer; a step of curing the transparent protective film layer at room temperature; and a step of polishing the upper surface of the transparent protective film layer. 2. Production of a display plate in which an image of a transfer paper on which an image is formed by printing with a sublimable dye ink is superimposed on a receiving layer of a display substrate, and an image of the transfer paper is transferred under heating and pressure. In the method, a step of forming a receiving layer on a display substrate, a step of heating to cure the receiving layer, a step of polishing the surface of the cured receiving layer, and a step of heating and pressing a color image from transfer paper Transferring under the following conditions, a step of heating the receiving layer to erase the transferred dots, a step of heating and curing the receiving layer, and a step of polishing the surface of the receiving layer, Display panel manufacturing method. 3. The method according to claim 1, wherein at least one of the receiving layer and the transparent protective film layer comprises 2- (3,5-di-t-butyl-2-human peroxyphenyl).
2. An ultraviolet absorber comprising at least one kind of UV absorber comprising benzotriazole or 2- (3-t-butyl-5-methyl-2-human peroxyphenyl) -5-chlorobenzotriazole or ultrafine zinc oxide. Or the manufacturing method of the display board of Claim 2.