KR101461074B1 - Method for coating a uv coating material on a board - Google Patents

Abstract

The present invention provides a method for coating a UV coating material on a board enabling rapid UV hardening, wherein the UV coating material coated on the board can be UV-hardened in a short time. The method comprises the steps of: disposing a polyfilm (62) right on a wood board (64) coated with a UV coating material; uniformly planarizing the UV coating material (63) by compressing the polyfilm (62) using a pressing roller (75); and hardening the planarized UV coating material by passing a lamp line on which LED UV lamps are arranged in one or more rows thereon. The UV coating material is mixed with 53-94 wt% of a reactive oligomer, 5-40 wt% of an acrylic monomer as a cross-linking agent, and 1-7 wt% of an optical initiator, wherein a small quantity of body pigments and other additives can be added. The optical initiator is a liquid mixture of ″DAROCURE TPO,″ ″IRGACURE 819,″ or a mixture thereof, and the wavelength of the LED lamp is 380 to 400 nm.

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 sheet material such as MDF, and more particularly to a UV curing coating method on a sheet material capable of rapid curing.

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, according to the above-mentioned prior art, after the priming step, a paint injection step of pouring an ultraviolet ray paint on the surface of a material, a film preparing step of covering the poly film on the material surface, Since the step of coating the ultraviolet paint for coating the ultraviolet paint and the step of curing the paint for curing the ultraviolet paint by using the ultraviolet ray emitting device on the surface of the material and the step of removing the polyfilm after the step of hardening the paint are respectively performed, , A lot of manpower is required, and there is a problem in that it is possible to give a feeling of agility due to unnecessary incomplete curing due to natural light due to the delay of time, and in the case of a slightly warped material, there is no additional contact between the material and the paint .

Korean Patent No. 733606 (name: surface coating method) Korean Patent No. 1370054 (name: a method of adhering a film to a plate after pretreatment using an ultraviolet curable paint)

In order to solve the above problems, the present inventors have devised a device for curing an ultraviolet coating material by pressing a film of an ultraviolet coating material applied to a plate material. In this case, UV curing has to be performed within a short time.

The present invention provides a method of coating a UV paint on a plate that enables rapid UV curing, so that it can be used in an apparatus for performing compression and curing in the above single process.

According to an aspect of the present invention, there is provided a method of coating a UV curable coating on a plate capable of rapid curing, the method comprising: positioning a poly film (62) on a wood material plate (64) ; Pressing the poly film (62) with a pressing roller (75) to uniformly planarize the UV paint (63); And curing the planarized UV coating over a lamp line arranged in one or more rows of LED UV lamps; Wherein the UV paint is a mixture of 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, wherein a small amount of an extender pigment and / An additive may be added, and the photoinitiator may be a liquid form of "DAROCURE TPO" or "IRGACURE 819" or a mixture thereof, and the wavelength of the LED lamp is in the range of 380 nm to 400 nm.

Preferably, the wavelength of the LED lamp is in the range of 385 nm to 395 nm.

Preferably, the photoinitiator is a 100% liquid phase initiator which is dissolved in a monomer having a bifunctional or less low volatility at a concentration of 30 to 50% or contains no organic solvent.

Preferably, the UV paint is a colored paint further comprising 1 to 25 parts by weight of a colored pigment, based on 100 parts by weight of the mixture of the reactive oligomer, the acrylic monomer and the photoinitiator.

Also, preferably, the LED lamp line has a plurality of LED UV lamps disposed in a bar shape, and the output per unit area of the bar UV lamp is about 2 to 20 W / cm 2.

Also, preferably, the LED lamp line is characterized in that LED lamps having a predetermined width are arranged side by side in two rows.

Also preferably, the step of uniformly planarizing the UV coating and the step of curing are simultaneously performed.

In accordance with another aspect of the present invention, there is provided a method of coating a UV paint on an environmentally friendly wood material plate capable of rapid curing, comprising the steps of: applying a UV light onto a wood material plate (64) ); Pressing the poly film (62) with a pressing roller (75) to uniformly planarize the UV paint (63); And curing the planarized UV coating over a lamp line arranged in one or more rows of LED UV lamps; Wherein the UV paint is a mixture of 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, wherein a small amount of an extender pigment and / (2-Hydroxyethyl Acrylate), IBOA (Isobornyl Acrylate), < / RTI >< RTI ID = Is a mixture of any one monomer selected from the group consisting of DPHA (Dipentaerythritol Hexylacrylate), TMPTA (Trimethylopropane Triacrylate), HDDA (1.6 Hexanediol Diacrylate), PETA (Pentaerythritol Triacrylate) and TPGDA (Tripropyleneglycol Diacrylate) do.

According to another aspect of the present invention, there is provided a method of coating a UV paint on a plate capable of rapidly curing, comprising the steps of supporting and elevating a table 67 for holding a material 64 coated with a paint, The supporting and elevating portions 6 where the frame 65 of the poly film 62 is positioned and the ultraviolet coating 63 applied to the material 64 placed on the table 67 are placed on the poly film 62 And a pressing and curing part (7) for curing the flattened ultraviolet coating material while being planarized in a state of being covered with the coating material. The method of coating a UV material on a plate using a UV coating material coating device, (S14) of placing the sheet on a table for ascending / descending; Raising (S15) the supporting and elevating part (6) to the position of the poly film (62) immediately above the material (64); The ultraviolet curing is performed by the UV lamp 76 while uniformly holding the ultraviolet curing coating 63 so as to press the poly film 62 while horizontally moving the pressing roller 75 of the pressing and curing unit 7, (S16); (S17) lowering the elevation table so that the material 64 and the poly film 62 are separated from each other after the ultraviolet curing is performed; (S18) discharging the painted material by horizontally moving the material; Wherein the UV paint is a mixture of 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, wherein a small amount of extender pigment and / An additive may be added, and the photoinitiator is a liquid form of "DAROCURE TPO" or "IRGACURE 819" or a mixture thereof, and the wavelength of the UV lamp is in the range of 380 nm to 400 nm.

According to the LED UV paint coating method on a plate material capable of rapid curing according to the present invention, it is possible to shorten the UV curing step, which has taken a few seconds in the past, to about one second or less (to an order of about one tenth of a second) The UV lamp can be cured while moving at a high speed, so that the efficiency can be maximized. In particular, the flattening step of positioning the rollers on the upper side of the poly-film and rolling the UV- It is possible to provide a UV paint coating method capable of performing a paint curing step of curing an ultraviolet ray paint using a single process. As a result, the process can be simplified, rapid manufacture is possible, manpower required can be reduced as much as possible, As a matter of course, as the time lags, incomplete hardening phenomenon due to natural light or uneven coating film is formed on warped MDF material It is possible to prevent coating defects phenomena.

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.
3 is a flow chart showing an environmentally friendly UV paint coating method on a plate material according to the present invention.
4 is a flow chart showing an environmentally friendly UV paint coating method on another plate related to the present invention.
5 is a schematic view of a UV paint coating apparatus on a plate in which a curing process using a UV paint coating method on a plate material capable of rapid curing of the present invention is simplified.
6 to 8 are side views of a main part of a UV paint coating apparatus on a plate which simplifies a curing process applying a UV paint coating method on a plate material capable of rapid curing of the present invention, Fig. 7 is a perspective view showing a state in which the material is placed on a poly-film, and Fig. 8 is a side view of a state in which curing is performed in a state of being flattened and pressed by a pressing roller.
9 is a flow chart of a method of coating a UV paint on a plate in which a curing process using a UV paint coating method on a plate material capable of rapid curing of the present invention is simplified.
10 is a chemical structural formula of exemplary photoinitiators.
11 is a photograph illustrating a taping test method for performing a performance test of a method of coating a UV paint on a plate capable of rapid curing of the present invention.
FIG. 12A is a photograph of a case in which the coated state is good on the MDF plate, the left side is a picture in a state of being painted, and the right side is a picture in a state in which scratches are made to check whether or not there is a defect.
12B is a photograph of a state in which the coating state on the MDF plate is not cured internally but only the surface is cured and wrinkles are generated.
12C are photographs when the coating state on the MDF plate is poor.

Prior to describing the preferred embodiments of the present invention, the "environmentally friendly UV paint coating method" of the present applicant's prior patent application no. 2014-9941 dated January 27, 2014, relating to the present invention, . FIG. 3 is a flowchart showing an environmentally friendly UV paint coating method on a plate related to the present invention, and FIG. 4 is a flowchart showing an environmentally friendly UV paint coating method on another plate related to the present invention. This technique is not prior art, but is incorporated herein to facilitate understanding of the present invention.

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.

The first method of coating the environmentally friendly UV paint on the plate material related to the present invention is as follows. As shown in FIG. 3, the UV paint application step (S3), the polyfilm application step (S4), the surface planarization step (S5) A first ultraviolet ray irradiation step S6, a polyphthalic film removal step S7, and a second ultraviolet ray irradiation step S8, which will be described below in detail.

& 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 2-HEA (2-Hydroxyethyl Acrylate), IBOA (Isobornyl Acrylate), DPHA (Dipentaerythritol Hexylacrylate), TMPTA (Trimethylopropane Triacrylate), HDDA (1.6 Hexanediol Diacrylate), PETA (Pentaerythritol Triacrylate) (Tripropyleneglycol Diacrylate), or a mixture of one or more monomers. For reference, when monomers other than acrylic monomers are used, they are not environmentally friendly due to the generation of volatile or aromatic organic compounds, but some styrene-based monomers (SM: styrene) may be acceptable.

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

The reactive oligomer is preferably an unsaturated polyester resin obtained by a condensation reaction of a polybasic acid containing an unsaturated polybasic acid and a polyhydric alcohol and an acrylic monomer as a reactive diluent is an acrylic monomer having a bifunctional or more functional group having extremely low volatility desirable.

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 general UV curing system is prepared by dissolving a powdery initiator in an organic solvent such as Acetone, Methylene Cloride, and Ethyl Acetate at a concentration of 30 to 50% (preferably at a concentration of 35 to 45%) However, the total amount of organic solvents used was not volatilized, and a small amount of organic solvent was released at a later time to provide air pollution. Therefore, the photoinitiator in the related art was used either by using a 100% liquid phase initiator containing no organic solvent, or by dissolving a powdery photoinitiator in a monofunctional or higher functional monomer (e.g., 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.

In the related art, the UV paint may further comprise 1 to 25 parts by weight (preferably 1 to 5 parts by weight) of a color pigment and 1 to 2 parts by weight of an additive, based on 100 parts by weight of the mixture have.

& 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, in general, UV refers to a wavelength in the range of 320 nm to 460 nm, but the uv irradiation apparatus of the related art cures the coating using a 360 nm wavelength generated by applying an electrical stimulus by inserting mercury into a quartz tube, The lamp of the technology uses a long wavelength of 420 nm. When the wavelength is long, the energy is weak but the penetration power is improved. Therefore, it is possible to apply not only the transparent paint but also the coloring paint with coloring granules It has advantages.

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 related art can be formed relatively thinly and uniformly by the surface planarization step as compared with the curtain coating method, so that it is possible to cure even by a single process. On the other hand, when the UV coating comes into contact with air before curing In the past, the surface was instantaneously cured by using a high-pressure lamp because a phenomenon of aging was caused by reaction with oxygen. In the related art, since the film is adhered before the UV paint is cured, it is shielded from air so that the 'Tacky' phenomenon can be prevented even if only the 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.

According to the conventional method, the environmental hazardous substance (t _VOC ) of about 4 to 6 mg / m 2 · h was emitted from the unit area per unit time. However, according to the related art, the environmental hazardous substance of less than 0.05 mg / t _VOC ) is released, the MDF surface treatment excellent in smoothness, homogeneity and curability becomes possible.

Then, packaged and shipped surface treated MDF.

Next, a second method of applying an environmentally friendly UV paint to a sheet material related to the related art is described with reference to FIG.

The method of painting the environmentally friendly UV paint of the present method comprises the steps of direct rolling S1, a third ultraviolet irradiation step S2, a combination rolling step S3 ', a poly film adhering step S4, a surface planarization step S5, A first ultraviolet ray irradiation step S6, a polyphthalic film removal step S7 and a second ultraviolet ray irradiation step S8, which will be described below in detail.

& 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 eco-friendly UV paint coating method on the plate according to the second method, a more uniform and thick coat layer can be formed as compared with the first embodiment.

(The Example )

Now, a method of coating a UV paint on a plate capable of rapid curing according to the best mode of the present invention will be described.

The method of applying UV coating to a plate capable of rapid curing according to the present invention is also characterized in that the UV coating application step (S3), the polyfilm application step (S4), the surface planarization step (S5), the first ultraviolet irradiation step (S6) And a film removing step (S7), wherein each step is performed as shown in the environmentally friendly UV paint painting method on the plate related to the present invention of Fig.

However, in the case of the method of the present invention, the surface planarization step (S5) and the first ultraviolet ray irradiation step (S6) can be performed at the same time. In the case of the UV paint of the present invention, 53 to 94% To 40% by weight of an acrylic monomer as a crosslinking agent, and 1 to 7% by weight of a photoinitiator, to which a small amount of extender pigments and other additives may be added.

At this time, it is preferable that the photoinitiator absorbs a wavelength of 380 to 400 nm to react, and it is particularly preferable to use "DAROCURE TPO" or "IRGACURE 819".

In addition, the LED UV lamp used at this time uses an LED UV lamp emitting a wavelength of 380 to 400 nm (preferably 385 to 395 nm, more preferably 385 nm or 395 nm), and in order to prevent the damage of the polyfilm, Should not exceed 50 캜.

In the case of the LED UV lamp, it has an advantage that the calorific value is remarkably small as compared with the TL lamp, and only the UV of a specific wavelength band can be concentratedly output, so that it is advantageous in that it can be cured quickly and surely. For example, LED UV lamps having a width of 10 mm are arranged transversely and arranged in one or two rows to constitute a light irradiation device. Then, the light irradiation device is operated at a speed of 20 m / min or less And curing is possible.

In the case of a conventional high-pressure discharge lamp such as a TL lamp or a Gel lamp, a high temperature is generated along with ultraviolet rays, and the temperature of the irradiated portion reaches 50 to 80 DEG C. When the temperature is generally 50 DEG C or more, And there is a problem that the coated surface is uneven and the expensive film can not be recycled. On the other hand, in the case of the LED UV lamp used in the present invention, since the temperature of the irradiated portion does not exceed 40 ° C when used in one row or two rows, a flat film surface can be formed and the expensive poly- Therefore, it is advantageous.

For reference, the intensity of the LED UV lamp used in the present invention is preferably 20W / cm 2 or less (i.e., 2 to 20W / cm 2, preferably 2W / A 10 mm wide LED UV lamp row having an intensity of 2 to 10 W / cm 2, more preferably 4 to 8 W / cm 2, and most preferably 6 W / cm 2 is used and arranged in parallel in one or two rows use. Although three or more columns are possible, if the columns are concentratedly arranged in three or more rows, the temperature in the central portion may rise by 50 ° C or more, and one row or two rows are preferable.

The acrylic monomer and the reactive oligomer may be used in an environmentally friendly UV paint coating method on the plate material according to the present invention. However, in the case of using the LED UV lamp of the present invention, The reactive oligomer is preferably an unsaturated polyester resin obtained by a condensation reaction of a polybasic acid containing an unsaturated polybasic acid and a polyhydric alcohol. The acrylic monomer as a reactive diluent is preferably an acrylic monomer having a bifunctional or more functional group having extremely low volatility , But 2-HEA (2-Hydroxy Ethyl Acrylate) is a monofunctional monomer, but it has high reactivity and low volatility and may be used together for coating flexibility.

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 photopolymerization initiator used in the present invention is a photopolymerization initiator in which the initiator in the form of a powder is added to a monofunctional or bifunctional monomer (particularly an acrylic monomer or TPGDA) having a low volatility at a concentration of 30 to 50% (preferably 35 to 45% ) Or a 100% liquid phase initiator not containing an organic solvent is used.

For reference, "DAROCURE TPO" as the photoinitiator is a kind of monoakylphosphine (MAPO), for example, "Dipheny (2,4,6-trimethylbenzoyl) -phosphine oxide" and "IRGACURE 819" (BAPO), for example, "Phosphine oxide, phenyl bis (2,4,6-trimethylbenzoyl)", and their chemical structural formulas are shown in FIG.

The UV paint may further comprise 1 to 25 parts by weight (preferably 1 to 5 parts by weight) of a color pigment and 1 to 2 parts by weight of an additive, based on 100 parts by weight of the mixture.

The UV lamp in the method of the present invention preferably uses an LED lamp that can be formed in a very narrow wavelength region and has a wavelength of about 380 to 400 nm (preferably 385 to 395 nm, more preferably 385 to 395 nm) The ultraviolet rays are irradiated.

Preferably, the irradiation in the ultraviolet light irradiation step is performed by arranging a plurality of LED UV lamps in a bar shape, wherein the output per unit area of the bar-shaped UV lamp is about 2 to 20 W / cm 2 (more preferably 2 to 10 W / Cm &lt; 2 &gt;) LED UV lamp.

Thereafter, as shown in FIG. 3, the polyphilm removing step S7 and the second ultraviolet irradiation step S8 are carried out as necessary, as shown in the environmentally friendly UV paint coating method on the plate material according to the present invention, Pack and ship rough-surfaced MDF.

In some cases, the preprocessing steps S1 and S2 as shown in FIG. 4 are performed, and then the UV coating step S3 is performed as a combination rolling step S3 '.

As a more specific example of the coating method of the UV paint on the plate capable of rapid curing of the present invention, examples of the constituent components of each component and the wavelength of the LED lamp to be used are as follows.

For reference, the mixing ratio of the reactive oligomer of the UV paint, the acrylic monomer as the cross-linking agent, and the photoinitiator may be appropriately changed within the above range for the purpose of controlling the viscosity.

( Experimental Example  1-1 to 2-2 and Comparative Example  1-1 to 3-5)

Now, as the various experimental examples and comparative examples of the LED UV paint coating method on the plate material capable of rapid curing of the present invention, the drying and coating defects were compared under the same conditions with different wavelengths at intervals of 10 nm.

Experimental Example  1-1

3% by weight of a photoinitiator of "DAROCURE TPO-50%" ("DAROCURE TPO" dissolved in TPGDA at a concentration of 50% at 70 ° C.) was mixed with 80% by weight of a reactive oligomer (unsaturated polyester resin) ) Was used, and the LED was irradiated with UV light by two rows of LED ultraviolet lamps having a width of 10 mm and a wavelength of 385 nm, to thereby cure the MDF. The MDF was irradiated with 10 W / cm 2 (10 mm wide LED lamps arranged in two rows) were cured while moving relative to each other at a speed of 10 m / min.

Experimental Example  1-2

The same UV coating as in Experimental Example 1-1 was used and cured by irradiating an LED ultraviolet lamp having a wavelength of 395 nm.

Experimental Example  2-1

An ultraviolet ray paint obtained by mixing 3% by weight of a photoinitiator of "IRGACURE 819-50% " with 80% by weight of reactive oligomer and 17% by weight of an acrylic monomer was irradiated with an LED ultraviolet lamp having a wavelength of 385 nm The conditions are the same as in Experimental Example 1-1).

Experimental Example  2-2

The same UV coating as in Experimental Example 2-1 was used and cured by irradiating an LED ultraviolet lamp having a wavelength of 395 nm thereto.

As a comparative example in comparison with Experimental Examples 1-1 to 2-2 of the present invention, examples of the constituent components of each component and the wavelength of the LED lamp to be used are as follows.

Comparative Example  1-1

(Using the same ultraviolet ray coating as in Experimental Example 1-1) was used in which 3 wt% of a photo initiator of "DAROCURE TPO-50%" was mixed with 80 wt% of reactive oligomer and 17 wt% of an acrylic monomer, And then irradiated with an LED ultraviolet lamp having a wavelength of 365 nm to cure (the other conditions are the same as in Experimental Example 1-1).

Comparative Example  1-2

The same UV coating as in Comparative Example 1-1 was used and cured by irradiating an LED ultraviolet lamp having a wavelength of 375 nm thereto.

Comparative Example  1-3

The same ultraviolet ray paint as in Comparative Example 1-1 was used and irradiated with an LED ultraviolet lamp having a wavelength of 405 nm to be cured.

Comparative Example  2-1

(Using the same ultraviolet ray coating as in Experimental Example 2-1) was used in which 3 wt% of a photoinitiator of "IRGACURE 819-50%" was mixed with 80 wt% of reactive oligomer and 17 wt% of an acrylic monomer, And then irradiated with an LED ultraviolet lamp having a wavelength of 365 nm to cure (the other conditions are the same as in Experimental Example 2-1).

Comparative Example  2-2

The same UV coating as in Comparative Example 2-1 was used and cured by irradiating an LED ultraviolet lamp having a wavelength of 375 nm thereto.

Comparative Example  2-3

The same UV coating as in Comparative Example 2-1 was used and cured by irradiation with an LED ultraviolet lamp having a wavelength of 405 nm.

Comparative Example 3-1

An ultraviolet ray paint obtained by mixing 3% by weight of a photoinitiator of "IRGACURE 2022-50% " with 80% by weight of reactive oligomer and 17% by weight of an acrylic monomer was irradiated with an LED ultraviolet lamp having a wavelength of 365 nm The conditions are the same as in Experimental Example 1-1).

Comparative Example  3-2

The same UV coating as in Comparative Example 3-1 was used and cured by irradiating an LED ultraviolet lamp having a wavelength of 375 nm thereto.

Comparative Example  3-3

The same UV coating as in Comparative Example 3-1 was used and cured by irradiation with an LED ultraviolet lamp having a wavelength of 385 nm.

Comparative Example 3-4

The same UV coating as in Comparative Example 3-1 was used and cured by irradiation with an LED ultraviolet lamp having a wavelength of 395 nm.

Comparative Example 3-5

The same UV coating as in Comparative Example 3-1 was used and cured by irradiating an LED ultraviolet lamp having a wavelength of 405 nm thereto.

Table 1 shows the results of the tests of Experimental Examples 1-1 to 2-2 and Comparative Examples 1-1 to 3-5. The results of the so-called 'taping test method' Respectively.

This is because, for example, a plate coated with a UV paint having a surface area of 10 cm is scratched with a knife in the form of a grid with intervals of 2 mm (see Fig. 11), a transparent scotch tape is stuck thereon, It was judged that the coating state was good.

Types of Photoinitiators and LED Lamp Wavelength result Remarks Comparative Example 1-1 DAROCURE TPO-50% 365 nm Non-drying Comparative Example 1-2 DAROCURE TPO-50% 375 nm Bad Experimental Example 1-1 DAROCURE TPO-50% 385 nm Good O.K Experimental Example 1-2 DAROCURE TPO-50% 395 nm Good O.K Comparative Example 1-3 DAROCURE TPO-50% 405 nm Non-drying Comparative Example 2-1 IRGACURE 819-50% 365 nm Non-drying Comparative Example 2-2 IRGACURE 819-50% 375 nm Bad Yellowing Experimental Example 2-1 IRGACURE 819-50% 385 nm Good Yellowing EXPERIMENTAL EXAMPLE 2-2 IRGACURE 819-50% 395 nm Good Yellowing Comparative Example 2-3 IRGACURE 819-50% 405 nm Non-drying Comparative Example 3-1 IRGACURE 2022-50% 365 nm Non-drying Comparative Example 3-2 IRGACURE 2022-50% 375 nm Non-drying Comparative Example 3-3 IRGACURE 2022-50% 385 nm Non-drying Comparative Example 3-4 IRGACURE 2022-50% 395 nm Non-drying Comparative Example 3-5 IRGACURE 2022-50% 405 nm Non-drying

As shown in <Table 1>, both the coating state and the yellow state were good in the case of Experimental Example 1-1 and 1-2, and in the case of Experimental Example 2-1 and Experimental Example 2-2, But yellowing phenomenon occurred somewhat.

On the other hand, in Comparative Examples 1-1 and 1-3 and Comparative Examples 2-1 and 2-3, the wavelength range of the LED lamp did not match with the photosensitive range of the experimental examples of the present invention, In Examples 1-2 and 2-2, curing occurred but peeling occurred later. On the other hand, in the case of Comparative Examples 3-1 to 3-5, the curing was not well performed in the entire wavelength range.

12A is a photograph of the case where the coating state on the MDF plate is good, the left side is a photograph in a state of being painted, and the right side is a photograph of a state in which a scratch is made in order to check whether the MDF plate is defective. FIG. 12B is a photograph of a state in which the coating state on the MDF plate material is a state in which the interior surface is not cured but only the surface thereof is cured and wrinkles are generated, as in the case of Comparative Example 1-1, And the pictures of the case of Comparative Example 1-2.

Therefore, in view of this fact, it is preferable to use "DAROCURE TPO-50%" as the photoinitiator and to cure by irradiating an LED ultraviolet lamp having a wavelength of 380 to 400 nm thereto. However, if yellowing is not taken into consideration, Quot; IRGACURE 819-50% "was used as the ultraviolet light, and curing was performed by irradiating an LED ultraviolet lamp having a wavelength of 380 to 400 nm thereto, it was possible to cure within a short time enough to simultaneously perform compression and curing.

It was found that the use of an LED ultraviolet lamp or other photoinitiator out of the above wavelength range was unsuitable.

( Experimental Example  4-1 to 6-2 and Comparative Example  4-1 to 6-3)

On the other hand, as various other experimental examples and comparative examples of the LED UV paint coating method on the plate material capable of rapid curing of the present invention, a transparent paint and a colored paint were used, and under the same conditions, (Maximum speed) were tested, respectively.

At this time, the transparent paint used was the same as that used in Experimental Example 1-1, and in the case of the colored paint, a part of the acrylic monomer and the reactive oligomer was replaced with the TiO ₂ white pigment.

That is, 3% by weight of a photoinitiator of "DAROCURE TPO-50%" ("DAROCURE TPO" dissolved in TPGDA at a concentration of 50% at 70 ° C.) was added to 80% by weight of a reactive oligomer (unsaturated polyester resin) And 17% by weight of an acrylic monomer (TPGDA) were used,

On the other hand, 4% by weight of a photoinitiator of "DAROCURE TPO-50%"("DAROCURETPO" dissolved in TPGDA at a concentration of 50% at 70 ° C.) (TPGDA) of 15 wt%, and further mixed with 3 wt% of a white pigment (TiO ₂ ).

On the other hand, 4% by weight of the photoinitiator of "DAROCURE TPO-50%"("DAROCURETPO" dissolved in TPGDA at a concentration of 50% at 70 ° C.) was added to the 5% ) And 14% by weight of an acrylic monomer (TPGDA), and further mixed with 5% by weight of a white pigment (TiO ₂ ).

Experimental Example  4-1

The clear coating material was used as an ultraviolet light coating material, and the LED was irradiated with UV light by one row of 385 nm wavelength LED ultraviolet lamps having a width of 10 mm to harden, and the intensity of 6 W / cm 2 (10 mm wide LED lamps in one row) were cured while moving relative to each other at a constant speed to obtain a maximum line speed (maximum speed) with good curing.

Experimental Example  4-2

The maximum line speed (maximum speed) at which curing was good was obtained while irradiating an ultraviolet ray paint and UV irradiation apparatus same as in Experimental Example 4-1 and irradiating an LED ultraviolet lamp having a wavelength of 395 nm.

Experimental Example  5-1

The above 3% colored paint was used as an ultraviolet paint in place of the clear paint, and one set of 385 nm wavelength LED ultraviolet lamp having a width of 10 mm was cured by LED UV irradiation, and 6 W / Cm &lt; 2 &gt; was cured while relatively moving at a constant speed in a 10 mm width (one row of 10 mm width LED lamps) to obtain a maximum line speed (maximum speed) with good curing. (Conditions other than the paint used are the same as in Experimental Example 4-1).

Experimental Example  5-2

The maximum line speed (maximum speed) with good curing was obtained while irradiating an ultraviolet ray paint and UV irradiator same as in Experimental Example 5-1 and irradiating an LED ultraviolet lamp having a wavelength of 395 nm. (The other conditions are the same as in Experimental Example 5-1).

Experimental Example  6-1

The above 5% colored paint was used as an ultraviolet paint in place of the clear paint, and a set of LED UV lamps having a width of 10 mm and a wavelength of 385 nm was irradiated with UV light to cure the LEDs. / Cm &lt; 2 &gt; was cured while relatively moving at a constant speed in a 10 mm width (one row of 10 mm width LED lamps) to obtain a maximum line speed (maximum speed) with good curing. (Conditions other than the paint used are the same as in Experimental Example 4-1).

Experimental Example  6-2

A maximum line speed (maximum speed) with good curing was obtained while curing the same by irradiating an ultraviolet ray paint and UV irradiation apparatus same as in Experimental Example 6-1 with an LED ultraviolet lamp having a wavelength of 395 nm. (The other conditions are the same as in Experimental Example 6-1).

As a comparative example in comparison with Experimental Examples 4-1 to 6-2 of the present invention, examples of the constituent components of each component and the wavelength of the LED lamp used are as follows.

Comparative Example  4-1

The maximum line speed (maximum speed) at which curing was good was obtained while irradiating a UV ultraviolet lamp of 365 nm wavelength with the same UV coating and UV irradiation apparatus as in Experimental Example 4-1. (The other conditions are the same as in Experimental Example 4-1).

Comparative Example  4-2

The maximum line speed (maximum speed) at which curing was good was obtained while curing the same by irradiating an ultraviolet ray paint and UV irradiation apparatus same as in Experimental Example 4-1 with an LED ultraviolet lamp having a wavelength of 405 nm. (The other conditions are the same as in Experimental Example 4-1).

Comparative Example  5-1

A maximum line speed (maximum speed) with good curing was obtained while curing the same by irradiating an ultraviolet ray painting apparatus and a UV irradiation apparatus as in Experimental Example 5-1 with an LED ultraviolet lamp having a wavelength of 365 nm. (The other conditions are the same as in Experimental Example 5-1).

Comparative Example  5-2

A maximum line speed (maximum speed) with good curing was obtained while curing the same by irradiating an ultraviolet ray paint and a UV irradiation apparatus same as in Experimental Example 5-1 with an LED ultraviolet lamp having a wavelength of 405 nm. (The other conditions are the same as in Experimental Example 5-1).

Comparative Example  6-1

A maximum line speed (maximum speed) with good curing was obtained while irradiating an ultraviolet ray paint and UV irradiator same as in Experimental Example 6-1 and irradiating an LED ultraviolet lamp having a wavelength of 365 nm. (The other conditions are the same as in Experimental Example 6-1).

Comparative Example  6-2

The maximum line speed (maximum speed) at which curing was good was obtained while irradiating an ultraviolet ray paint and UV irradiation apparatus same as in Experimental Example 6-1 and irradiating an LED ultraviolet lamp having a wavelength of 405 nm. (The other conditions are the same as in Experimental Example 6-1).

( Experimental Example  7-1 to 9-2 and Comparative Example  7-1 to 7-3)

On the other hand, as another experimental example and a comparative example of the LED UV paint coating method on a plate material capable of rapid curing of the present invention, a transparent paint and a colored paint were used, and under the same condition, In this test, the LED line speed of one row was tested in Experimental Example 4-1, but in this test, two rows of LEDs (maximum speed) were tested. The line speed was tested.

In this case, the transparent paints and colored paints used were the same as those used in Experimental Examples 4-1 to 6-1, and the LED lamps were the same as Experimental Examples 4-1 to 6-1 -1, respectively.

Experimental Example  7-1

The transparent coating material was used as an ultraviolet light coating material, and the LED was irradiated with UV light in a set of two rows of 385 nm wavelength LED ultraviolet lamps having a width of 10 mm to cure the MDF having a strength of 6 W / cm 2 (10 mm wide LED lamps arranged in two rows) were cured while moving relative to each other at a constant speed to obtain a maximum line speed (maximum speed) with good curing. (Other conditions than the LED lamp irradiation width are the same as in Experimental Example 5-1).

Experimental Example  7-2

A maximum line speed (maximum speed) with good curing was obtained while curing the same by irradiating an ultraviolet ray paint and a UV irradiation apparatus same as in Experimental Example 7-1 with an LED ultraviolet lamp having a wavelength of 395 nm. (The other conditions are the same as in Experimental Example 7-1).

Experimental Example  8-1

The above 3% colored paint was used as an ultraviolet paint in place of the clear paint, and the LED was irradiated with UV light by two rows of LED ultraviolet lamps having a width of 10 mm and a wavelength of 385 nm and cured, / Cm &lt; 2 &gt; was cured while relatively moving at a constant speed with a width of 20 mm (10 mm wide LED lamps arranged in two rows) to obtain a maximum line speed (maximum speed) with good curing. (Conditions other than the paint used are the same as those in Experimental Example 7-1).

Experimental Example  8-2

A maximum line speed (maximum speed) with good curing was obtained while curing the same by irradiating an ultraviolet ray paint and UV irradiator same as in Experimental Example 8-1 with an LED ultraviolet lamp having a wavelength of 395 nm. (The other conditions are the same as in Experimental Example 8-1).

Experimental Example  9-1

The above 5% colored paint was used as the ultraviolet paint in place of the clear paint, and two sets of 385 nm wavelength LED ultraviolet lamps having a width of 10 mm were cured by LED UV irradiation, and 6 W / Cm &lt; 2 &gt; was cured while relatively moving at a constant speed with a width of 20 mm (10 mm wide LED lamps arranged in two rows) to obtain a maximum line speed (maximum speed) with good curing. (Conditions other than the paint used are the same as those in Experimental Example 7-1).

Experimental Example  9-2

The maximum line speed (maximum speed) with good curing was obtained while curing the same by irradiating an ultraviolet ray paint and UV irradiator same as in Experimental Example 9-1 with an LED ultraviolet lamp having a wavelength of 395 nm. (The other conditions are the same as in Experimental Example 9-1).

As a comparative example in comparison with Experimental Examples 7-1 to 9-2 of the present invention, examples of the constituent components of each component and the wavelength of the LED lamp used are as follows.

Comparative Example  7-1

The maximum line speed (maximum speed) at which curing was good was obtained while irradiating a UV ultraviolet lamp having a wavelength of 365 nm with the same UV coating and UV irradiation apparatus as in Experimental Example 7-1. (The other conditions are the same as in Experimental Example 7-1).

Comparative Example  7-2

The maximum line speed (maximum speed) with good curing was obtained while curing the same by irradiating an ultraviolet ray paint and UV irradiator same as in Experimental Example 7-1 with an LED ultraviolet lamp having a wavelength of 405 nm. (The other conditions are the same as in Experimental Example 7-1).

In the case of Comparative Example 8-1 , Comparative Example 8-2 and Comparative Example 8-3 , only the wavelengths of LED lamps used under the same conditions as in Experimental Example 8-1 were 365 nm, 375 nm, and 405 nm , And the remaining conditions were the same.

In the case of Comparative Example 9-1 , Comparative Example 9-2 and Comparative Example 9-3 , only the wavelengths of LED lamps used under the same conditions as in Experimental Example 9-1 were 365 nm, 375 nm, and 405 nm , And the remaining conditions were the same.

Table 2 shows the experimental methods and experimental results of Experimental Examples 4-1 to 6-2 and Comparative Examples 4-1 to 6-3. As a result, the maximum line speed at which hardening of the plate material is possible Respectively. For example, in the case of Experimental Example 4-1, coating at a speed of 8 m / min or less indicates sufficient curing, and the faster the maximum speed, the better the technique.

365 nm 375 nm 385 nm 395 nm 405 nm Clear paint Comparative Example 4-1 Comparative Example 4-2 Experimental Example 4-1 Experimental Example 4-2 Comparative Example 4-3 3% colored pigment Comparative Example 5-1 Comparative Example 5-2 Experimental Example 5-1 Experimental Example 5-2 Comparative Example 5-3 5% colored pigment Comparative Example 6-1 Comparative Example 6-2 Experimental Example 6-1 Experimental Example 6-2 Comparative Example 6-3 LED illumination width 10mm 365 nm 375 nm 385 nm 395 nm 405 nm Clear paint 2.5 3 8 8 3 3% colored pigment 1.5 2 5 5 2 5% colored pigment 1.5 2 4 4 2 Unit: m / min

As shown in Table 2, the test samples 4-1 and 4-2 were able to perform the coating even at the fastest line speed (less than 8m per minute), and then the test samples 5-1 and 5-2 Example 5-2 could be carried out even at a line speed of 5 m per minute, and then the coatings could be carried out at a line speed of 4 m per minute in Experimental Example 6-1 and Experimental Example 6-2.

In the other comparative examples, the curing had to be performed at a line speed of 3 m per minute or less. In particular, in each experiment, there was a remarkable difference between 375 nm and 385 nm, and a remarkable difference between 395 nm and 405 nm.

Table 3 shows the experimental methods and experimental results of Experimental Examples 7-1 to 9-2 and Comparative Examples 7-1 to 9-3. As shown in Table 3, the maximum line speed Respectively.

365 nm 375 nm 385 nm 395 nm 405 nm Clear paint Comparative Example 7-1 Comparative Example 7-2 Experimental Example 7-1 Experimental Example 7-2 Comparative Example 7-3 3% colored pigment Comparative Example 8-1 Comparative Example 8-2 Experimental Example 8-1 Experimental Example 8-2 Comparative Example 8-3 5% colored pigment Comparative Example 9-1 Comparative Example 9-2 Experimental Example 9-1 Experimental Example 9-2 Comparative Example 9-3 LED illumination width 20mm 365 nm 375 nm 385 nm 395 nm 405 nm Clear paint 5 6 15 15 6 3% colored pigment 3 4 10 10 4 5% colored pigment 2.5 3 8 8 3.5 Unit: m / min

As shown in Table 3, in Examples 7-1 and 7-2, even at the fastest line speed (10 m per minute or less), the coating could be transferred evenly. Next, in Experimental Example 8-1 and Experimental Example 7-2 8-2 could be carried out even at a line speed of 10 m per minute, and then the coatings could be carried out at a line speed of 8 m per minute in Experimental Example 9-1 and Experimental Example 9-2.

In the other comparative examples, the curing was performed at a line speed of 6 m / min. Also, in each experiment, there was a remarkable difference between 375 nm and 385 nm, and a remarkable difference between 395 nm and 405 nm. In Table 3 where the LED width is 20 mm, the difference is more remarkable than in Table 2 where the LED lines are arranged in one line (LED width is 10 mm).

On the other hand, the above-described UV coating method on a plate that can be rapidly cured according to the present invention can be applied to a UV coating method and apparatus of the present invention, , It is more preferable.

(Optimal Examples  Applied Application Technology)

5 to 9, a method and apparatus for coating a UV coating on a plate, which simplifies the curing process using the UV coating method on a plate material capable of rapid curing of the present invention, will now be described in detail.

FIG. 5 is a schematic view of a UV paint coating apparatus on a plate which simplifies a curing process applying a UV paint coating method to a plate material capable of rapid curing of the present invention, and FIGS. 6 to 8 are schematic views Fig. 6 is a side view of the main part of the UV paint coating device on a plate material in which the curing process using the UV paint coating method is applied, Fig. 6 is a side view in which the material is placed in the support and elevation parts, Fig. 8 is a side view of a state in which curing is performed in a state of being flattened and pressed by a pressing roller. Fig. FIG. 9 is a flowchart of a method of coating a UV paint on a plate in which the curing process using the UV paint coating method on a plate material capable of rapid curing of the present invention is simplified.

As shown in FIG. 5, the UV paint coating apparatus on the plate, which simplifies the curing process of applying the UV paint coating method to the plate material capable of rapid curing of the present invention, is made of MDF plate material, plywood, The inlet end and the outlet end table lifter 1 for introducing the material to be shipped to the loading unit 10 for the introduction into the UV paint coating apparatus of the present invention, A discharge conveyor 8 for conveying the material packed in the packing section 9 to the discharge end table lifter 1, and a combination roller section 8 corresponding to a main part of the present invention. (5), a supporting and elevating part (6), and a pressing and hardening part (7), and an intermediate conveyor (4) is required before, after and between these main parts. If necessary, it may be subjected to a direct rolling part 3 and a first hardening step as a pre-treatment step. The intermediate conveyor 4 is provided between the combination rolling section 5 and the supporting and elevating section 6 as well as between the direct rolling section 3 and the combination rolling section 5 and between the supporting and elevating section 6 And the discharge conveyor 8, as shown in Fig.

The supporting and elevating part 6 which is a main part of the present invention includes a table 67 for holding a material 64 such as MDF, a support table 61 for supporting the table 67, A cylinder 66 for raising and lowering the support table 61 as required and an ultraviolet paint 63 roughly coated on the surface of the material by the combination rolling section 5 are covered with the poly film 62, And a frame 65 which is planarized.

On the other hand, the pressing and hardening portion 7, which is another essential part of the present invention, is formed by flattening the ultraviolet paint 63 coated on the material 64 placed on the table 67 with the poly film 62, A crane 74 for horizontally moving the pressing roller on the table, and an ultraviolet painting material which is supported on the crane by another support 78 and is flattened just behind the pressing roller, A shielding film 77 which is supported on the crane by the support 78 and shields the clamping roller 75 and the UV lamp 76 from shattering; . For example, the supporting and conveying means may comprise a cross bar 72 supporting the crane, a vertical bar 71 supporting the bar, and a rail 73 installed on the bar and sliding the sliding roller of the crane .

Now, the operation of the UV paint coating apparatus on the plate material in which the curing process applying the UV paint coating method to the plate material capable of rapid curing of the present invention is simplified will be explained with reference to FIG. 5 to FIG.

First, as shown in Fig. 5, the material is supplied to the direct rolling section 3 through the table lifter 1 and the inflow conveyor 2 at the right end. In the direct rolling part 3, a pair of rollers rotating in a forward direction with respect to a material feeding direction is performed, and the adhesion is performed for the purpose of pretreatment for an enhancement indicator, and can be performed in the same manner as in the conventional preprocessing method. And may be omitted in some cases.

Next, it is preliminarily cured using a UV lamp, and is transported to the combination rolling part 5 through the first intermediate conveyor 4. The combination rolling section 5 is provided with a pair of forward rollers for applying a coating material to the material while rotating in the forward direction with respect to the material supply direction and a pair of reverse rollers for flattening the coating material applied to the material while rotating in the opposite direction And is conveyed through the second intermediate conveyor 4 to the supporting and elevating part 6, which is the main part of the present invention.

On the other hand, as shown in FIG. 6, a rectangular ring-shaped frame (not shown) holding the poly film 62 is disposed directly above the material 64 on which the paint 63 is applied to the upper surface, Since the supporting and elevating portions 6 are located on the lower side, the central portion of the poly film 62 is downward.

Now, when the supporting and elevating portion 6 is raised upward by the cylinder 66, the poly film immediately above the material 64 on which the paint is applied on the upper surface is convex upward (refer to FIG. 7 ). Thereafter, as shown in Fig. 8, the UV flattening and curing are performed simultaneously by the pressing and hardening portion 7.

That is, as the crane 74 is slid along the rails 73 provided on the cross bar 72 of the press-bonding and hardening section 7 and the press roller 75 presses the poly film 62, The ultraviolet curing is performed by the UV lamp 76 in a state in which the coating layer 63 is uniformly pressed, so that the ultraviolet curing coating can be uniformly coated and the generation of air bubbles between the coating and the polyfilm can be suppressed as much as possible.

Further, in the case of a material having a very large size, materials such as MDF can be slightly bent when stored for a long time. In the conventional case, the material and the ultraviolet ray paint are flattened by press rolling, In this case, since the MDF is bent in a state in which the ultraviolet ray paint is slightly floating, the uneven coating film is formed on the warped MDF material. However, according to the apparatus and method of the present invention, And the material is instantaneously cured in a state in which the material is squeezed. Therefore, such a phenomenon can be prevented as much as possible. In addition, there has been a problem of paint failure phenomenon that the paint is not completely adhered to the material in the case of MDF as well as incomplete curing phenomenon of the paint when the ultraviolet paint is applied and cured for a long time on the material. According to the method and the method, such a problem can be minimized.

Thereafter, the material 64 and the poly film 62 are moved relative to each other, and the crane 74 is returned to the original position in the opposite direction to prepare for the next operation. The material having been painted is transferred to the third intermediate conveyor 4 by a horizontal movement to the discharge conveyor 8. Thereafter, wrapping is performed in the packaging section 9, and finally, the painting of the present invention is completed by loading the material on the loading section 10 through the table lifter 1 at the left end.

If necessary, after the third intermediate conveyor 4 and the discharge conveyor 8, a post-treatment can be carried out through the cold UV lamp on the material off the poly-film, which may remain in the painted coating layer It is for blowing away organic compounds.

On the other hand, in order to achieve coating by such an apparatus of the present invention, it is premised that good ultraviolet curing is performed. As a result, the present inventors have found that the "DAROCURE TPO-50%" or "IRGACURE 819-50 Quot;% "is mixed with an acrylic oligomer and an ultraviolet ray paint mixed with an acrylic monomer, and irradiating an LED ultraviolet lamp having a wavelength of 380 nm to 400 nm thereto, instantaneous curing which is sufficiently meaningful is possible, and compression rolling and ultraviolet curing I could do it.

The LED ultraviolet lamp 76 having a wavelength ranging from 380 nm to 400 nm is irradiated on the MDF 64 having a length of 2.4 m to cure the UV LED lamp 76 with a pressing roller 75 and a pressure of 2 to 20 W / Cm &lt; 2 &gt;) was pressed and cured while relatively moving the cantilever 74 supporting the LED ultraviolet lamp 76 by the support 78 at a speed of 10 m / min.

Finally, a method of coating a UV paint on a plate, which simplifies the curing process applying the UV paint coating method to a plate material capable of rapid curing of the present invention, will be described with reference to FIG.

9, when the material flows into the direct rolling part 3 through the table lifter 1 and the inflow conveyor 2 at the right end, the direct rolling part 3 moves in the forward direction with respect to the feeding direction of the material A direct rolling step is performed by a pair of rotating rollers (S11), and then preliminary curing, which is a preliminary ultraviolet irradiation step like the related art, is performed using a UV lamp (S12).

The pair of forward rollers are rotated in the forward direction with respect to the feeding direction of the material so that the material is supplied to the combination roller 5 through the first intermediate conveyor 4, And a pair of reverse rollers are rotated in opposite directions to perform a combination rolling step of flattening the paint applied to the material (S13).

Thereafter, the material is transferred to the supporting and elevating portion 6, which is a main portion of the present invention, through the second intermediate conveyor 4, and is placed on the elevating table (S14) To the position of the poly film 62 immediately above the material 64 (S15). For reference, the rim portion of the poly-film 62 is fixed to the frame 65 in the form of a rectangular rim by elastic means such as a rubber string. Therefore, when the elevating table is raised to a proper position, do. That is, when the supporting and elevating portion 6 is lifted upward by the cylinder 66, the poly film immediately above the material 64 on which the paint is applied on the upper surface becomes convex upward, .

Thereafter, as the crane 74 is slid along the rails 73 provided on the cross bar 72 of the pressing and hardening section 7, and the pressing roller 75 presses the poly film 62, (S16) so that ultraviolet curing is performed by the UV lamp 76 in a state in which the UV lamp 63 is uniformly pressed.

After the ultraviolet curing is performed, the table 64 is lowered so that the material 64 and the poly film 62 are spaced apart from each other (S17), and the material with painted coating is conveyed to the discharge conveyor 8 through the third intermediate conveyor 4, (S18). Thereafter, wrapping is performed in the packaging section 9, and the material is loaded on the loading section 10 through the table lifter 1 at the left end to be shipped.

If necessary, post-treatment can be carried out through the cold UV lamp on the material off the poly-film in the third intermediate conveyor 4 and the discharge conveyor 8, as described above.

As described above, according to the method and apparatus for coating a UV paint on a plate material applying the curing method according to the present invention, it is possible to easily carry out work with only one person . Furthermore, since the polyfilm is pressed uniformly by the pressing roller and cured immediately, it is possible to minimize the occurrence of uniform coating and bubbles, and to coat the plate with minimal warpage.

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.

(Invention)
1: table lifter 2: inflow conveyor
3: Direct rolling part 4: Medium conveyor
5: Combination rolling part 6: Support and elevation part
7: Compression and hardening part 8: Discharge conveyor
9: packing section 10:
61: support frame 62: poly
63: ultraviolet paint 64: material
65: Frame 66: Cylinder
67: Table
71: Vertical pole 72: Crossbar
73: rail 74: crane
75: Compression roller 76: UV lamp
77: blocking film 78: support
(Prior art)
11: support 12: poly-film
13: ultraviolet paint 14: material
a: Rubber R: Roller
T: Table

Claims (8)

As a UV paint coating method on a plate material capable of rapid curing,
Positioning the poly film (62) directly on the wood material (64) coated with UV paint;
Pressing the poly film (62) with a pressing roller (75) to uniformly planarize the UV paint (63); And
Curing the planarized UV paint over a lamp line arranged in one or more rows of LED UV lamps;
, &Lt; / RTI &
The UV paint is a mixture of 53 to 94% by weight of reactive oligomer, 5 to 40% by weight of an acrylic monomer as a crosslinking agent, and 1 to 7% by weight of a photoinitiator, and a small amount of extender pigment and other additives are added thereto And,
The photoinitiator is a " DAROCURE TPO "or" IRGACURE 819 "or a mixture thereof in liquid form,
Wherein the wavelength of the LED lamp is in the range of 380 nm to 400 nm. As a UV paint coating method on a wood material plate capable of rapid curing,
Positioning the poly film (62) directly on the wood material (64) coated with UV paint;
Pressing the poly film (62) with a pressing roller (75) to uniformly planarize the UV paint (63); And
Curing the planarized UV paint over a lamp line arranged in one or more rows of LED UV lamps;
, &Lt; / RTI &
The UV paint is a mixture of 53 to 94% by weight of reactive oligomer, 5 to 40% by weight of an acrylic monomer as a crosslinking agent, and 1 to 7% by weight of a photoinitiator, and a small amount of extender pigment and other additives are added thereto And,
The photoinitiator is a " DAROCURE TPO "or" IRGACURE 819 "or a mixture thereof in liquid form,
The acrylic monomer may be selected from the group consisting of 2-HEA (2-Hydroxyethyl Acrylate), IBOA (Isobornyl Acrylate), DPHA (Dipentaerythritol Hexylacrylate), TMPTA (Trimethylopropane Triacrylate), HDDA (1.6 Hexanediol Diacrylate), PETA (Pentaerythritol Triacrylate) ) Or a mixture of two or more monomers. The UV curable coating composition according to claim 1, 3. The method according to claim 1 or 2,
Wherein the wavelength of the LED lamp is in the range of 385 nm to 395 nm. 3. The method according to claim 1 or 2,
Wherein the photoinitiator is a 100% liquid phase initiator which is obtained by dissolving "DAROCURE TPO" in a concentration of 30 to 50% in a monomer having two or more functionalities with low volatility, or an organic solvent-free initiator. UV paint coating method. 3. The method according to claim 1 or 2,
Wherein the UV paint is a colored paint further comprising 1 to 25 parts by weight of a colored pigment based on 100 parts by weight of the mixture of the reactive oligomer, the acrylic monomer and the photoinitiator. Way. 3. The method according to claim 1 or 2,
Wherein the LED lamp line is arranged in two rows of LED lamps having a predetermined width. 3. The method according to claim 1 or 2,
Wherein the step of uniformly planarizing the UV coating and the step of curing the UV coating are carried out at the same time. A table 67 on which the painted material 64 is placed is supported and lifted and the upper portion is supported and elevated with the frame 65 of the poly film 62 being placed thereon, And a pressing and hardening unit 7 for curing the flattened ultraviolet coating material while pressing the ultraviolet coating material 63 applied on the material 64 placed on the substrate 64 in a state of being covered with the poly film 62 As a UV paint coating method on a plate using a UV paint coating apparatus,
(S14) of conveying the material to the supporting and elevating part (6) and seating it on the elevating table;
Raising (S15) the supporting and elevating part (6) to the position of the poly film (62) immediately above the material (64);
The ultraviolet curing is performed by the UV lamp 76 while uniformly holding the ultraviolet curing coating 63 so as to press the poly film 62 while horizontally moving the pressing roller 75 of the pressing and curing unit 7, (S16);
(S17) lowering the elevation table so that the material 64 and the poly film 62 are separated from each other after the ultraviolet curing is performed; And
A step S18 of discharging the painted material by horizontally moving the material;
/ RTI &gt;
The UV paint is a mixture of 53 to 94% by weight of reactive oligomer, 5 to 40% by weight of an acrylic monomer as a crosslinking agent, and 1 to 7% by weight of a photoinitiator, and a small amount of extender pigment and other additives are added thereto And,
The photoinitiator is a " DAROCURE TPO "or" IRGACURE 819 "or a mixture thereof in liquid form,
Wherein the UV lamp has a wavelength in the range of 380 nm to 400 nm.

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