KR101446598B1 - Method for coating a uv coating material on a board - Google Patents

Abstract

The present invention provides a method for applying UV-curable paint on a board in various patterns. For this, the method for applying the UV-curable paint on the board to form various patterns includes (c) a UV-curable paint coating process (S3) of applying UV-curable paint of approximately 120-250 g per square meter (m^2) on a surface of a board by a predetermined thickness, (d) a poly film attaching process (S4) of attaching a poly film on the applied UV-curable paint, (e) a surface planarization process (S5) of planarizing a surface of the poly film to spread the UV-curable paint to a uniform thickness of approximately 120-250 μm, (g) first UV irradiation process (S6) of curing the applied UV-curable paint, and (h) a poly film removing process (S7) of removing the poly film attached in the process (d). In the process (g), the first UV irradiation is performed by a low-voltage lamp that causes UV curing at a wavelength of 360-420 nm and executes an output of 10-20 W/cm per unit length.

Description

METHOD FOR COATING A UV COATING MATERIAL ON A BOARD BACKGROUND OF THE INVENTION 1. Field of the Invention [0001]

The present invention relates to a method of coating a UV curable coating material on a plate material, and more particularly, to a method of coating a UV curable coating material on a plate material such as MDF in various patterns.

The MDF (Medium Density Fiberboard) is a wood-plated product with a density of 0.4-0.8 g / cm ³ made by joining wood fiber obtained by firing at high temperature with wood lumber as a main material, To 30 mm thick.

It is possible to carry out complicated machining operations with uniform fiber distribution over the entire thickness without complicated machining operations without rupture of the side or sides. Therefore, MDF is used for table top plate, door, drawer front etc. do. It is also very suitable for smooth, firm, and overlaying or painting decorative films or veneers. Due to its excellent stability, machinability and high strength, it can be used in place of ordinary wood for drawer sides, cabinet rails, mirror frames, and modeling.

However, since it is weak in moisture, it is necessary to perform surface treatment by a method such as film adhesion or coating with a film.

Generally, as a surface coating method of such MDF plate, there are a method of coating a poly film and a curtain coating method, and recently, a method of ultraviolet curing using an ultraviolet ray sensitive coating material is mainly used for environmental reasons and time economical reasons.

First, the ultraviolet curing curtain coater method is a method of curing by irradiating ultraviolet rays by flowing ultraviolet ray-curing paint into a plate material in a curtain manner, and it is environmentally friendly, but the molten paint must continuously flow out. It takes a lot of time to resume again, and thus it has a limitation that it is not suitable for the production of a small quantity of various products.

On the other hand, in the poly-film coating method, a coating material in which a proper mixture of an unsaturated polyester, an accelerator, and a setting material is applied to a plate, a poly film is placed thereon, and then the mixture is smoothed by a roller and then cured by heating or ultraviolet rays.

A conventional method of coating the surface of such a MDF plate is disclosed in Korean Patent No. 733606. 1 and 2, the polyurethane film 12 and the rollers 12 are fixed to the support 11 after the step of coating transparent urethane paint on the material 14 such as wood, iron, acrylic, glass, A surface of a material 14 is coated with an ultraviolet ray paint 13 using an ultraviolet ray (R), and after the above-mentioned undercoating step, a surface of a material of wood, steel, acrylic, (S10); A film preparing step (S20) of covering the poly film to the upper side of the surface of the material onto which the ultraviolet ray paint is poured; An ultraviolet light painting step (S30) of applying the ultraviolet light painting material partially poured on the material surface while placing the roller on the upper side of the poly film and rolling the roller after the film preparing step; A coating curing step (S40) of curing the ultraviolet curing coating material on the surface of the material coated with the ultraviolet curing coating after the coating of the ultraviolet curing coating; And a surface painting completion step (S50) of completing the surface painting by removing the poly film after the painting curing step.

According to the method of the first prior art, the ultraviolet paint is poured on the material while the expensive method such as the curtain coating method is not used, and then the polyphilm is placed on the upper side of the ultraviolet paint and the roller is rolled The ultraviolet ray paint is filled in the grooves generated by the impact exerted by the external force and the self-wound of the material, and the ultraviolet ray paint is pressed by the rolling of the roller and the ultraviolet ray paint applied on the surface of the material is coated at a constant height , There is an advantage that the surface of the material is smooth and glossy and shows a flat plane. In addition, there is an advantage that the waste of ultraviolet ray paints can be reduced and the surface treatment of relatively flat surfaces is possible.

However, when a colored ultraviolet ray paint containing a color pigment is coated on a wood and the ultraviolet ray paint is cured by exposing it to ultraviolet rays, since the above method does not transmit ultraviolet rays, the ultraviolet ray paint is not easily cured, The coloring of the ultraviolet light coating material is different from that of the coloring material. Therefore, when the thickness of the ultraviolet light coating material painted on the wood is increased, So that the wood can not be painted with various colored ultraviolet ray paints.

In addition, since the polyfilm is removed after curing, 100% of monomer monomers including styrene, which are mainly used, are not formed, and unreacted monomers are released into the atmosphere, so that volatile organic compounds and aromatic organic compounds And the release of formaldehyde by the peroxide as a curing agent has not been environmentally friendly.

That is, the unsaturated polyester coatings currently in use are inexpensive and can be cured at room temperature for 2 to 3 hours, and thus have been used as furniture finishing materials. However, STYRENE, which is used as a reactive diluent, remains in the coating with unreacted monomers and volatilizes in minute amounts even after full curing, thereby deteriorating the indoor air quality of the house due to odor and toxicity. In addition, cobalt naphthenate used as a promoter and peroxide used as a curing agent have a problem of contaminating the environment by releasing formaldehyde, which is fatal to the human body, as a reaction by-product during curing reaction.

Korean Patent No. 733606 (name: surface coating method)

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is an object of the present invention to provide a method for coating a plate with various patterns of ultraviolet curing type paint.

According to an aspect of the present invention, there is provided a UV coating method capable of forming various patterns on a plate, comprising the steps of: (c) applying a UV coating on a surface of a plate to a predetermined thickness; (d) a poly-film adhering step (S4) for adhering the poly-film onto the applied UV paint; (e) a surface planarization step (S5) of flattening the surface of the poly-film to uniform thickness of the UV coating; (g) a first ultraviolet irradiation step (S6) for UV curing the applied UV paint; And (h) a polyfilm removal step (S7) for removing the polyfilm in the step (d); Wherein the first ultraviolet ray irradiation in step (g) is performed by a low pressure lamp which generates UV curing at a wavelength of 360 to 420 nm and emits an output of 10 to 20 W / cm per unit length, (i) the ultraviolet light intensity in the second ultraviolet light irradiation step (S8) is higher than the ultraviolet light intensity in the first ultraviolet light irradiation step (S6) after the step (h) .

Preferably, the step (c) is performed by dividing the UV coating application step into several times by a direct rolling method and a reverse rolling method.

delete

Further, a UV painting method capable of forming various patterns on a plate according to another aspect of the present invention includes: (c) a UV coating step (S3) of applying a UV coating to a surface of a plate to a predetermined thickness; (d) a poly-film adhering step (S4) for adhering the poly-film onto the applied UV paint; (e) a surface planarization step (S5) of flattening the surface of the poly-film to uniform thickness of the UV coating; (g) a first ultraviolet irradiation step (S6) for UV curing the applied UV paint; And (h) a polyfilm removal step (S7) for removing the polyfilm in the step (d); Wherein the first ultraviolet irradiation in step (g) is performed by a low-pressure lamp which generates UV curing at a wavelength of 360 to 420 nm and emits an output of 10 to 20 W / cm per unit length, (A) a second UV coating application step (S1) of applying a UV coating to the plate surface to a predetermined thickness; And (b) a third ultraviolet irradiation step (S2) for UV curing the applied UV paint; (C) is a step of applying a UV paint to a predetermined thickness on a coating film formed in the second UV coating step (S1) and the third UV irradiation step (S2).

According to still another aspect of the present invention, there is provided a UV paint coating method capable of forming various patterns on a plate, comprising the steps of: (c) applying a UV paint onto a surface of a plate to a predetermined thickness; (d) a poly-film adhering step (S4) for adhering the poly-film onto the applied UV paint; (e) a surface planarization step (S5) of flattening the surface of the poly-film to uniform thickness of the UV coating; (g) a first ultraviolet irradiation step (S6) for UV curing the applied UV paint; And (h) a polyfilm removal step (S7) for removing the polyfilm in the step (d); Wherein the first ultraviolet irradiation in step (g) is performed by a low-pressure lamp which generates UV curing at a wavelength of 360 to 420 nm and emits an output of 10 to 20 W / cm per unit length, Wherein the UV coating has a viscosity of 80 to 130 KU.

According to still another aspect of the present invention, there is provided a UV paint coating method capable of forming various patterns on a plate, comprising the steps of: (c) applying a UV paint onto a surface of a plate to a predetermined thickness; (d) a poly-film adhering step (S4) for adhering the poly-film onto the applied UV paint; (e) a surface planarization step (S5) of flattening the surface of the poly-film to uniform thickness of the UV coating; (g) a first ultraviolet irradiation step (S6) for UV curing the applied UV paint; And (h) a polyfilm removal step (S7) for removing the polyfilm in the step (d); Wherein the first ultraviolet irradiation in step (g) is performed by a low-pressure lamp which generates UV curing at a wavelength of 360 to 420 nm and emits an output of 10 to 20 W / cm per unit length, , 53 to 94 wt% of a reactive oligomer, 5 to 40 wt% of a monomer as a crosslinking agent, and 1 to 7 wt% of a photoinitiator, and a small amount of extender pigment can be added for pattern formation.

More preferably, the monomer is selected from the group consisting of SM (Styrene), 2-HEA (2-Hydroxyethyl Acrylate), IBOA (Isobornyl Acrylate), DPHA (Dipentaerythritol Hexylacrylate), TMPTA (Trimethylopropane Triacrylate), HDDA (1.6 Hexanediol Diacrylate) (Pentaerythritol Triacrylate) and TPGDA (Tripropyleneglycol Diacrylate), or a mixture of one or more monomers.

According to the UV paint coating method capable of forming various patterns on the plate material according to the present invention, it is possible to effectively cure UV curable paints of various colors as well as transparent UV curable paints, A coating film having a pattern can be formed.

Further, according to a further feature of the present invention, it is possible to manufacture an MDF plate without releasing volatile organic compounds, aromatic organic compounds, and formaldehyde pollutants into the atmosphere, and since the film is not thermally deformed by using a low-pressure lamp, It is possible to recycle the poly-film after peeling off it, and it is possible to apply the environmentally-friendly UV paint to the plate which is preferable in terms of recycling of resources.

Other objects and advantages of the present invention will become apparent from the detailed description of the embodiments with reference to the attached drawings.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a flowchart for explaining a conventional plate material surface painting method. FIG.
2 is a view for explaining a conventional plate material surface painting method.
FIG. 3 is a flowchart showing a UV painting method capable of forming various patterns on a plate according to an embodiment of the present invention. FIG.
4 is a flowchart showing a UV painting method capable of forming various patterns on a plate according to another embodiment of the present invention.
Figures 5A-5C are test reports according to the best embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to FIGS. 3 to 4. FIG. FIG. 3 is a flow chart illustrating a method of coating a UV paint capable of forming various patterns on a plate according to an embodiment of the present invention. FIG. 4 is a view showing a UV paint coating capable of forming various patterns on a plate according to another embodiment of the present invention. Fig.

In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not restrictive of the invention, as claimed, and it is to be understood that the invention is not limited to the disclosed embodiments.

For reference, the present inventor filed a patent application No. 2012-71841 entitled " Method of Adhesion of Film after Pretreatment Using Ultraviolet Curable Coating on Plate "filed on July 2, 2012, Which is incorporated herein by reference.

( Embodiment 1 )

As shown in FIG. 3, the first method of coating a UV paint capable of forming various patterns on a plate material applied to the present invention includes a UV paint application step (S3), a polyfilm application step (S4), a surface planarization The first ultraviolet ray irradiation step S6, the polyphthalic film removing step S7 and the second ultraviolet ray irradiation step S8.

& Lt ; Step 1: UV paint application step >

After the preprocessing step, the UV curing type coating material application step (S3), which is the initial process, is a process of applying a UV curing type coating material onto the pre-treated MDF material, and coating method is mainly used. (However, in this case, it is not necessary to apply precisely as in the case of the conventional curtain coating method), and a brushing method or a method of pouring the paint into the container is also possible.

On the other hand, the UV paint used herein is a paint obtained by mixing 53 to 94% by weight of a reactive oligomer, 5 to 40% by weight of an acrylic monomer as a crosslinking agent, and 1 to 7% by weight of a photoinitiator, Additives may be added. Preferably, the coating composition is a mixture of 70 to 82 wt% reactive oligomer, 15 to 25 wt% of an acrylic monomer, and 3 to 5 wt% of a photoinitiator, and most preferably 76 to 80 wt% 20% by weight of an acrylic monomer and 4% by weight of a photoinitiator.

If the content of the acrylic monomer is less than 5% by weight, the viscosity of the coating may be too high to be smoothened. On the other hand, when the content of the acrylic monomer exceeds 40% by weight, unreacted monomers may remain after UV curing to release volatile organic compounds, There is a problem. On the other hand, the amount of the photoinitiator is preferably not more than 7% by weight. If it exceeds 7% by weight, the photoinitiator may be cured by natural ultraviolet rays, Can not do it. It is preferable that the photoinitiator absorbs a wavelength of at least 360 to 420 nm.

Examples of the acrylic monomer include styrene (SM), 2-HEA (2-hydroxyethyl acrylate), IBOA (isobornyl acrylate), DPHA (Dipentaerythritol hexylacrylate), TMPTA (Trimethylopropane Triacrylate), HDDA (1.6 hexanediol diacrylate) Pentaerythritol Triacrylate) and TPGDA (Tripropyleneglycol Diacrylate), or a mixture of one or more monomers. For reference, when an acrylic monomer is used, the generation of volatile or aromatic organic compounds is minimized and thus environmentally friendly. Therefore, it is environmentally preferable that the styrene-based monomer (SM: styrene) is contained in a small amount.

Of these, TPGDA (Tripropyleneglycol Diacrylate) is particularly environmentally friendly.

The reactive oligomer is preferably an unsaturated polyester resin containing an epoxy acrylate component and obtained by a condensation reaction of a polybasic acid containing an unsaturated polybasic acid and a polyhydric alcohol, and the acrylic monomer as a reactive diluent is a bifunctional The acrylic monomers having the above functional groups are preferred.

The acrylic monomer having two or more functional groups is preferably an acrylic monomer containing at least one member selected from TMPTA (Trimethylopropane Triacrylate), HDDA (1.6 Hexanediol Diacrylate), PETA (Pentaerythritol Triacrylate) and TPGDA (Tripropyleneglycol Diacrylate).

The photoinitiator used in the general UV curing system is dissolved in an organic solvent such as Acetone, Methylene Cloride, and Ethyl Acetate at a concentration of 40 to 60%, but the organic solvent used at this time is not volatilized And then released in minute amounts to provide the cause of air pollution. Therefore, the photoinitiator in the present invention is either a 100% liquid phase initiator containing no organic solvent, or a powdery photoinitiator dissolved in a monomer having a low volatility (eg, TPGDA). Unlike organic solvents, the bifunctional monomer does not dissolve the powdery initiator at room temperature and can be dissolved in the temperature range of 60 to 80 ° C. When a monofunctional monomer is used, it is possible to gel at 60 to 80 ° C., and the storage stability period of the coating is remarkably reduced.

The UV paint of the present invention may further comprise 1 to 25% by weight of a color pigment and 1 to 2% by weight of an additive based on 100% by weight of the mixture.

& Lt ; Second Step: Step of Attaching Poly Film & gt ;

Next, in the step of attaching the poly-film (S4), a poly-film such as a PET film is attached in a state in which the UV-curable paint is applied to the MDF plate. A PET film is preferable, but it is not limited thereto, and it is possible to remove the paint after curing and reuse it, so that it is possible to use a poly film having ultraviolet transmittance and a certain degree of heat resistance.

< Step 3: Surface planarization step >

The surface smoothing step S5 may be performed by rolling the roller over the poly-film, which is a process for thinly and uniformly spreading the applied paint. It is preferable that the coating amount is about 120 to 250 g per m 2 in the UV paint application step. Therefore, it is preferable that the thickness of the coating film when flattening in this step is about 120 to 250 μm.

If the thickness of the coating film is too thick, ultraviolet rays can not sufficiently penetrate to the lower side during UV curing in the next step, so that curing can not be performed.

On the other hand, when the film is rolled, the film is placed on the roll, and the roll is pressed so as to uniformly apply the coating, followed by curing with a low-pressure UV lamp. The viscosity standard of the present coating material that can compensate for the problem is proper at about 80 to 130 KU (KREB 'S UNIT) at 25 ° C, preferably about 90 to 100 KU.

< Fourth Step: First Ultraviolet Irradiation Step >

Thereafter, as described above, the ultraviolet ray irradiation step (S6) for UV curing the applied UV curable coating material is performed, and ultraviolet rays of approximately 320 to 450 nm wavelength (preferably 360 to 420 nm wavelength) For 120 seconds.

Preferably, the irradiation in the first ultraviolet irradiation step is preferably a 'TL lamp' of Philips, which causes UV curing at a wavelength range of 360 to 420 nm because the output per unit length of the bar type UV lamp is 10 to 20 W / cm (more preferably, about 10 W / cm or so).

In particular, although UV generally refers to a wavelength in the range of 320 nm to 460 nm, the uv irradiation apparatus of the present invention hardens the coating using a 360 nm wavelength generated by applying an electrical stimulus by inserting mercury into a quartz tube, The lamp has a long wavelength of 420 nm. The longer the wavelength, the weaker the energy but the better the penetration. Therefore, it has the additional advantage that it can be applied to colored paints with colored granules as well as curing of transparent paint. .

For reference, in order to obtain a long wavelength, a halogen element is injected into a quartz tube to give an electric stimulus, and an indium gallium lamp including indium and gallium can also be used. This is advantageous in that the 360 nm region and the 420 nm region simultaneously come out and have high efficiency .

In addition, the UV coating layer of the present invention can be formed relatively thinly and uniformly by the above-mentioned surface planarization step, and thus can be cured by a single process. On the other hand, if the UV coating comes into contact with air before curing, And thus, the surface is instantaneously cured using a high-pressure lamp in the past. In the present invention, since the film is adhered before the UV paint is cured, it can be prevented from being 'tacky' even if only a low-pressure lamp is used.

Furthermore, since the low-pressure lamp is hardened at a relatively low temperature of about 30 to 50 DEG C, the expensive poly-film is not damaged by heat, so that the film can be removed and reused in the next step.

< Step 5: Removing the poly-film >

As described above, in the polyfilm removal step (S7) to be performed subsequently, the poly film is removed from the coating film layer.

& Lt ; Step 6: Second Ultraviolet Irradiation Step >

Thereafter, as described above, the second ultraviolet ray irradiation step S8 is performed in order to emit the remaining organic solvent in a state in which the film is peeled off. As a result, ultraviolet rays of approximately 320 to 450 nm (preferably 360 to 420 nm) Is preferably irradiated for 3 to 5 seconds.

Meanwhile, in the second ultraviolet irradiation step, a middle pressure lamp or a high pressure lamp may be used, and a so-called 'Gel lamp' used for gelling the UV paint applied to the nails in the hairdressing room is a medium pressure lamp (30 W / cm) And a high pressure lamp (80 to 120 W / cm) is preferably used in combination with a 'high pressure mercury lamp' and an 'indium gallium lamp' manufactured by Shimonoba Tron Corporation.

Accordingly, according to the conventional method, the environmental hazardous substance (t _VOC ) of about 4 to 6 mg / m 2 · h was emitted in unit area per unit time, but according to the present invention, the environmental hazardous substance (t _VOC ) is released, MDF surface treatment with excellent smoothness, homogeneity and curability becomes possible.

Then, packaged and shipped surface treated MDF.

<Experimental Example>

Various experimental examples according to the first embodiment of the present invention are shown in Table 1, and the results are shown in Table 2.

In Table 2, the case of Experimental Example 1 was the most excellent in most aspects such as dryness, film hardness and TVOC, and the test report of 'National Furniture Test Institute' was attached to FIGS. 5A to 5C . As in the case of Experimental Example 1, TVOC was much lower than in the conventional case of 4 to 6 mg / m &lt; 2 &gt; / h.

( Second Embodiment )

Next, a second method of coating a UV paint capable of forming various patterns on a plate material applied to the present invention will be described with reference to FIG.

The method of coating the UV paint capable of forming various patterns according to the present embodiment includes a direct rolling step S1, a third ultraviolet light irradiation step S2, a combination rolling step S3 ', a poly-film attaching step S4, The first ultraviolet ray irradiation step S6, the polyphthalic film removing step S7 and the second ultraviolet ray irradiation step S8.

& Lt ; First Step: Direct Rolling Step >

In the first step (S1) of applying the UV curable paint, which is one of the pretreatment processes, a UV coating of about 40 to 60 g / m &lt; 2 &gt; is applied on the plate using a coating roll in the direct direction, Is similar to the first step (S3) of the first embodiment.

& Lt ; Second Step: Third Ultraviolet Irradiation Step >

Thereafter, as described above, the ultraviolet ray irradiation step (S2) for UV curing the coated UV coating in the pretreatment process is performed, and the GEL lamp is used at a medium pressure to dry the applied coating film, ).

The above first and second steps may be omitted altogether, however, the coating layer is formed in multiple layers, and thus the thickness of the coated layer can be increased.

Further, in order to attach a pattern paper on which a pattern is formed on a sheet of material such as LPM (Low Pressure Melamine) or HPM (High Pressure Melamine) to a MDF, It is possible to apply the coating material using the primer in the first step and cure in the second step after attaching the pattern paper, and then proceed to the next step and the following step.

< Step 3: Combination Rolling Step >

The combination rolling step S3 ', which is the next processing step, is similar to the UV curing type coating step S3 of the first embodiment.

In this combination rolling step, in order to further improve the smoothness of the surface of the MDF, after the direct rolling in which the advancing direction (that is, the coating direction) of the coating roll is the same as the moving direction of the plate material, Direction) is reversed, so that the application of the UV paint is performed in both directions.

At this time, the direct rolling is carried out by applying the UV curing type coating material of 80 to 150 g / m 2 as in the first embodiment by rolling, and the reverse rolling by applying the UV curing type coating material of about 40 to 100 g / ).

& Lt ; Fourth Step: Attachment of Poly-Film & gt ; & lt ; Step 8: Second Ultraviolet Irradiation Step &

Next, the poly-film adhering step S4, the surface flattening step S5, the first ultraviolet irradiation step S6, the poly-film removing step S7, and the second ultraviolet irradiation step S8 are the same as those of the first embodiment same.

According to the UV painting method capable of forming various patterns on the plate according to the second embodiment of the present invention, it is possible to form a more uniform and thick coat layer as compared with the first embodiment.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, Of course.

Claims (7)

(c) a UV paint application step (S3) of applying a UV paint to the surface of the plate material to a predetermined thickness;
(d) a poly-film adhering step (S4) for adhering the poly-film onto the applied UV paint;
(e) a surface planarization step (S5) of flattening the surface of the poly-film to uniform thickness of the UV coating;
(g) a first ultraviolet irradiation step (S6) for UV curing the applied UV paint; And
(h) a polyfilm removal step (S7) for removing the polyfilm in the step (d);
, &Lt; / RTI &
The first ultraviolet irradiation in step (g) is performed by a low-pressure lamp which generates UV curing at a wavelength of 360 to 420 nm and emits an output of 10 to 20 W / cm per unit length,
(i) After the step (h), the second ultraviolet irradiation step (S8)
Wherein the ultraviolet light intensity in the second ultraviolet light irradiation step (S8) is higher than the ultraviolet light intensity in the first ultraviolet light irradiation step (S6), wherein various patterns can be formed on the plate material. The method according to claim 1,
The step (c)
Wherein the UV coating step is divided into a plurality of times by a direct rolling method and a reverse rolling method. delete (c) a UV paint application step (S3) of applying a UV paint to the surface of the plate material to a predetermined thickness;
(d) a poly-film adhering step (S4) for adhering the poly-film onto the applied UV paint;
(e) a surface planarization step (S5) of flattening the surface of the poly-film to uniform thickness of the UV coating;
(g) a first ultraviolet irradiation step (S6) for UV curing the applied UV paint; And
(h) a polyfilm removal step (S7) for removing the polyfilm in the step (d);
Lt; / RTI &gt;
The first ultraviolet irradiation in step (g) is performed by a low-pressure lamp which generates UV curing at a wavelength of 360 to 420 nm and emits an output of 10 to 20 W / cm per unit length,
Prior to step (c)
(a) a second UV paint application step (S1) of applying a UV paint to the surface of the plate material to a predetermined thickness; And
(b) a third ultraviolet irradiation step (S2) for UV curing the applied UV paint;
Further comprising:
Wherein the step (c) is a step of applying a UV coating on a coating film formed in the second UV coating step (S1) and the third UV irradiation step (S2) to a predetermined thickness UV paint coating method. (c) a UV paint application step (S3) of applying a UV paint to the surface of the plate material to a predetermined thickness;
(d) a poly-film adhering step (S4) for adhering the poly-film onto the applied UV paint;
(e) a surface planarization step (S5) of flattening the surface of the poly-film to uniform thickness of the UV coating;
(g) a first ultraviolet irradiation step (S6) for UV curing the applied UV paint; And
(h) a polyfilm removal step (S7) for removing the polyfilm in the step (d);
Lt; / RTI &gt;
The first ultraviolet irradiation in step (g) is performed by a low-pressure lamp which generates UV curing at a wavelength of 360 to 420 nm and emits an output of 10 to 20 W / cm per unit length,
Wherein the UV coating has a viscosity of 80 to 130 KU in the step (c). (c) a UV paint application step (S3) of applying a UV paint to the surface of the plate material to a predetermined thickness;
(d) a poly-film adhering step (S4) for adhering the poly-film onto the applied UV paint;
(e) a surface planarization step (S5) of flattening the surface of the poly-film to uniform thickness of the UV coating;
(g) a first ultraviolet irradiation step (S6) for UV curing the applied UV paint; And
(h) a polyfilm removal step (S7) for removing the polyfilm in the step (d);
Lt; / RTI &gt;
The first ultraviolet irradiation in step (g) is performed by a low-pressure lamp which generates UV curing at a wavelength of 360 to 420 nm and emits an output of 10 to 20 W / cm per unit length,
The UV paint is a mixture of 53 to 94% by weight of reactive oligomers, 5 to 40% by weight of a monomer as a crosslinking agent, and 1 to 7% by weight of a photoinitiator, and a small amount of extender pigment A method of coating a UV paint capable of forming various patterns on a plate material. The method according to claim 6,
The monomer may be selected from the group consisting of SM (Styrene), 2-HEA (2-Hydroxyethyl Acrylate), IBOA (Isobornyl Acrylate), DPHA (Dipentaerythritol Hexylacrylate), TMPTA (Trimethylopropane Triacrylate), HDDA (1.6 Hexanediol Diacrylate) A mixture of one or more monomers selected from the group consisting of tripropyleneglycol diacrylate (TPGDA), and mixtures of one or more monomers.

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