KR102073007B1 - High Gloss UV Coated Exterior Panel and Manufacturing Method Thereof - Google Patents

Abstract

According to the present invention, the transfer film is thermally transferred to an aluminum panel in a continuous process using a thermal transfer roll, thereby greatly reducing the manufacturing process and time of the panel, thereby enabling mass production, and allowing the operation of the panel size to be carried out. By forming a UV coating layer using a UV-curable resin containing, even if the panel edge is bent to be used as a building exterior panel, there is no crack in the coating layer and thermal transfer patterns.
In addition, the present invention eliminates the process of applying the adhesive on the surface of the panel to be printed, by performing the transfer using the transfer film with the adhesive layer formed at the same time there is an effect of greatly shortening the print coating manufacturing time.

Description

High Gloss UV Coated Exterior Panel and Manufacturing Method Thereof}

The present invention relates to a bendable high gloss UV coated exterior panel having a transfer coating layer and a method of manufacturing the same.

The contents described in this section merely provide background information on the present embodiment and do not constitute a prior art.

Aluminum panels are light and weather resistant and are widely used for architectural exteriors. However, aluminum panels for this purpose are not easily expressed in various patterns, and are mostly manufactured in a flat form.

Since the aluminum panel itself does not absorb any transfer ink at all, the ink is smeared by heat during the process and the pattern is easily damaged. In addition, general high gloss UV coating is likely to cause cracks and breakage when the panel edges are bent.

In order to solve the above problems, the present invention is a UV film using a UV curable resin containing a urethane oligomer while performing a thermal transfer to the panel in a continuous process using a thermal transfer roll transfer film comprising a pattern layer or color layer The main purpose of the coating is to greatly shorten the manufacturing time of the printed coating of the aluminum exterior panel, and to provide the exterior panel without cracking of the coating layer even when the edge is bent.

In order to solve the above problems, the exterior panel according to an embodiment of the present invention, the panel preheating stage for preheating the panel to a first temperature; A thermal transfer film feed end; A thermal transfer stage for thermally transferring a transfer film including a print layer including a base ink layer and a vinyl layer separated after transfer onto a panel, the first roller and a second temperature heated to a second temperature higher than a first temperature. A thermal transfer stage in which transfer is performed by a thermal transfer roller stage including a second roller heated to a higher third temperature; A release paper peeling end separating the vinyl layer from the thermally transferred panel to complete thermal transfer; And a UV coating stage for forming a UV coating layer on the thermal transfer completed panel, the UV coating stage including a smoothing stage configured to irradiate increased UV light energy when the color of the base ink layer has low reflectance. In the exterior panel manufactured by the device, the UV coating layer is 20 to 30% by weight acrylic monomer, 30 to 40% by weight urethane oligomer, 10 to 20% by weight 2-methoxyethanol and isopropyl It is characterized by consisting of a resin of 10 to 20% by weight alcohol.

In addition, the UV coating step, the UV paint coating step for applying a UV paint on the heat transfer completed panel; Stabilization stage for stabilizing the applied UV paint over a predetermined time; It includes a first smooth stage to maintain the temperature of 15 ~ 20 ℃ higher than the room temperature to establish the smoothness of the stabilized UV paint, and a second smooth stage to produce a chemical reaction by the first UV lamp to further build the smoothness of the UV paint , Smooth; A first drying stage for first drying the UV coating with a second UV lamp; A second drying stage for completely drying the UV paint with a third UV lamp; And it characterized in that it comprises a cooling stage for cooling the completely dried panel to room temperature.

In addition, the transfer film, a vinyl layer; A release agent layer laminated on the vinyl layer; Including an adhesive layer laminated on the printing layer, the printing layer is characterized in that laminated between the release agent layer and the adhesive layer.

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In addition, the printing layer is characterized in that it further comprises a pattern ink layer laminated on the base ink layer.

The thermal transfer roller end may further include a third roller heated at a fourth temperature higher than the third temperature.

The second temperature is 195 to 205 ° C, the third temperature is 205 to 215 ° C, and the fourth temperature is 225 to 235 ° C.

Further, the first UV lamp, the second UV lamp and the third UV lamp are composed of a mercury UV lamp having a wavelength of 365 nm and a gallium UV lamp having a wavelength of 420 nm, wherein the first UV lamp has a low pressure of 140 W and the second UV lamp. The UV lamp is a high pressure of 1 kW, the third UV lamp is characterized in that the ultra-high pressure of 13 ~ 16.8 kW.

In addition, the first UV lamp is a mercury UV lamp when the base ink layer is a bright color and the reflectivity is 50% or more, only the mercury UV lamp is activated, and when the base ink layer is a dark color and the reflectance is less than 50%. It is characterized by operating with.

In addition, when the panel is an aluminum panel, the first temperature is characterized in that 75 to 85 ℃.

In addition, the UV coating step after the UV coating layer is characterized in that it further comprises a V-cutting end to be bent the outer panel is formed.

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According to the present invention, the transfer film is thermally transferred to an aluminum panel in a continuous process by a thermal transfer roll, thereby greatly reducing the manufacturing process and time of the panel, thereby enabling mass production, and allowing the operation of the panel size to be carried out. By forming a UV coating layer using a UV-curable resin containing, even if the panel edge is bent to be used as a building exterior panel, there is an effect that the crack of the coating layer does not occur.

In addition, the present invention eliminates the process of applying the adhesive to the surface of the panel to be printed, by providing a transfer film using the transfer film with the adhesive layer and at the same time by providing a UV coating provides an effect of significantly shortening the print coating manufacturing time.

1 is a cross-sectional view showing the structure of an exterior panel having a transfer coating layer according to an embodiment of the present invention.
2 is a cross-sectional view showing the structure of a transfer film according to an embodiment of the present invention.
3 is a conceptual diagram illustrating equipment for manufacturing a thermal transfer exterior panel according to an embodiment of the present invention.
4 is a flowchart illustrating a method of manufacturing an exterior panel according to an embodiment of the present invention.

Hereinafter, some embodiments of the present invention will be described in detail through exemplary drawings. In adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are used to refer to the same components as much as possible, even if displayed on different drawings. In addition, in describing the present invention, if it is determined that the detailed description of the related well-known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

In addition, in describing the component of this invention, terms, such as 1st, 2nd, A, B, (a), (b), can be used. These terms are only for distinguishing the components from other components, and the nature, order or order of the components are not limited by the terms. Throughout the specification, when a part is said to include, 'include' a certain component, which means that it may further include other components, except to exclude other components unless otherwise stated. . In addition, as described in the specification. The terms 'unit' and 'module' refer to a unit for processing at least one function or operation, which may be implemented by hardware or software or a combination of hardware and software.

1 is a cross-sectional view showing the structure of an exterior panel having a transfer coating layer according to an embodiment of the present invention.

Referring to FIG. 1, an exterior panel having a transfer coating layer 140 according to an embodiment of the present invention includes an aluminum panel 14, a transfer film transfer layer 11 disposed on an aluminum panel 14, and a transfer film transfer. UV coating layer 100 disposed on layer 11.

2 is a cross-sectional view showing the structure of a transfer film according to an embodiment of the present invention.

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Referring to FIG. 2, the transfer film 10 may include a vinyl layer 110, a release agent layer 120 formed on the vinyl layer 110, and a print layer on which a pattern to be transferred formed on the release agent layer 120 is printed. 140, an adhesive layer 150 formed on the printed layer 140 to attach the aluminum panel 14 and the transfer film 10.

The vinyl layer 110 may be made of a transparent and stretchable polyvinyl chloride material, and is a layer removed after the transfer.

The release agent layer 120 is comprised by synthesize | combining resin of a mold release agent component, and various organic solvents.

The print layer 140 is a layer formed by printing a dye in which a urethane resin and an organic solvent are mixed to form a pattern film. The print layer 140 is transferred and printed on the surface of the aluminum panel 14 by thermal transfer.

The adhesive layer 150 is a layer formed on the other side of the printing layer 140 and attached to a portion of the aluminum panel 14 to be transferred, and may be formed of an oily bond or an aqueous bond. In the case of an aqueous bond, for example, dichloromethy Phosphorus 60-70% by weight, acetone 1-10% by weight, para-tertiary-buthylphenol-formaldehyde 10-20% by weight and polyurethane 10-20% by weight Can be.

In the aluminum exterior panel according to the exemplary embodiment of the present invention, a printing pattern is thermally transferred on the aluminum panel 14 by the transfer film 10.

3 is a conceptual diagram illustrating equipment for manufacturing a thermal transfer exterior panel according to an embodiment of the present invention.

3, the exterior panel manufacturing equipment according to an embodiment of the present invention is a panel preheating stage 210, thermal transfer film supply end 212, thermal transfer roller end 214, release paper peeling end 216, UV paint coating stage 220, stabilizing stage 222, the first smooth end 224, the second smooth end 226, the first drying end 228, the second drying end 230, cooling stage 232 ) And a protective film attachment end 236.

4 is a flowchart illustrating a method of manufacturing an exterior panel according to an embodiment of the present invention.

4, the exterior panel manufacturing method according to an embodiment of the present invention is a panel preheating step (S100), thermal transfer film supply step (S200), thermal transfer step (S300), release paper peeling step (S400) and UV It includes a coating step (S500).

In addition, the UV coating step (S500) is UV coating step (S510), stabilization step (S520), the first smoothing step (S530), the second smoothing step (S540), the first drying step (S550), the second drying A step S560 and a cooling step S570 are included.

The panel preheating stage 210 preheats the continuously supplied aluminum panel 14 and reduces the temperature difference between the thermal transfer rollers 304, 306, 308 and the aluminum panel 14 in the thermal transfer process. The adhesive layer 150 is bonded to the aluminum panel 14 by heat in the thermal transfer process and has a viscosity by increasing the temperature. The adhesive layer 150 absorbs the transfer ink better in this state. By preheating the aluminum panel 14, the aluminum panel 14, the adhesive layer 150, and the printing layer 140 may be tightly adhered to each other.

In addition, when thermally transferring the aluminum panel 14 as in one embodiment, since the heat dissipation in the aluminum panel 14 is fast, preheating the aluminum panel 14 maintains the thermal transfer process at a constant temperature. It is advantageous to. In addition, since the thermal transfer is performed in a state in which the aluminum panel 14 is thermally expanded by preheating, the thermal expansion degree of the transfer film 10 may be reduced and the difference may be more accurately transferred.

The panel preheating stage 210 has a structure in which the top, bottom, left, and right sides of the panel except for the inlet and outlet through which the aluminum panel 14 is inserted and discharged are sealed. In the panel preheating stage 210, a heating unit for heating the injected aluminum panel 14 is installed. For example, in the case of the aluminum panel 14, it is heated to preheat the surface temperature of the discharged aluminum panel 14 to around 80 ° C. The negative temperature is maintained at 230 ° C. It is preferable to set the surface temperature of the aluminum panel 14 and the temperature of the heating part to a high temperature at which the transfer ink of the printing layer 140 does not melt and flow, and appropriate process conditions through experiments depending on the material and size of the panel. Can be selected.

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The thermal transfer film supply end 212 is a section in which the roller 302 on which the transfer film 10 is wound is arranged. The roller 302 is introduced from the thermal transfer film supply end 212 above.

The thermal transfer roller end 214 allows the print layer 140 to be transferred to the surface of the aluminum panel 14 through the adhesive layer 150. Referring to FIG. 2, the thermal transfer roller stage 214 includes a first roller 304, a second roller 306, and a third roller 308 and is configured in three stages.

In the thermal transfer process, a cross-linked body is formed in the adhesive layer 150 due to the elevated temperatures of the transfer film 10 and the aluminum panel 14, thereby increasing the bonding force with the aluminum panel 14.

Further curing of the transfer coating layer 11 in the thermal transfer process may be performed for 150 to 250 to 1 to 30 minutes based on the temperature of the thermal transfer roller (304, 306, 308). The temperature of the transfer coating layer 11 is lower than the temperature of the thermal transfer rollers 304, 306, 308. At this time, the process conditions such as the preheating temperature of the aluminum panel 14, the temperature of the thermal transfer rollers 304, 306, and 308, and the transfer speed of the aluminum panel 14 may be determined by the transfer coating ink used, the thickness of the transfer coating layer 11, and the type of the panel. And so on.

When thermally transferring the transfer film 10 to the aluminum panel 14 according to an embodiment of the present invention, the temperature of the first roller 304 is 200 ° C., the temperature of the second roller 306 is 210 ° C., and the third The temperature of the roller 308 is set to 230 ° C., and the feeding speed of the aluminum panel 14 is preferably 6 m / min.

The release paper peeling end 216 peels off the vinyl layer 110 from the aluminum panel 14 on which thermal transfer is completed, winds up the collection roll 310, and transfers the thermally transferred aluminum panel 14 to a UV coating step. Before the UV coating, foreign matters on the surface of the aluminum panel 14 may be removed using an air brush 312 or the like.

In this process, the surface may be corona discharged to improve the wettability of the surface of the aluminum panel 14, thereby improving adhesion of UV coating thereafter. Alternatively, a primer layer may be formed on the thermal transfer layer 11 to improve adhesion of UV coating.

UV coating is a coating method excellent in freshness, smoothness, hiding power, whiteness, high gloss, and hardness, and the coating material is cured by curing the material that is exposed to ultraviolet rays among the paint components using ultraviolet (UV).

In one embodiment, the UV-curable resin cured by ultraviolet light is 20 to 30% by weight acrylic monomer, 30 to 40% by weight urethane oligomer, 10 to 20% by weight 2-methoxyethanol and iso It is preferable that 10-20 weight% of propyl alcohol is mixed.

As a component of the resin, the monomer is used as a reactive diluent of the oligomer to impart the workability of the resin mixture, and also means a compound that polymerizes itself by ultraviolet irradiation to act as a crosslinking agent between polymers, and is compatible with the oligomer and the photoinitiator. Compound. The acrylic and urethane may be cured through a process of grafting / crosslinking by UV irradiation in a state of mixing in an emulsion state so that the acryl and urethane are in an intimate molecular mixing state.

When acrylic is formed of a polymer, it has excellent weather resistance and obtains a high gloss surface, but is inferior in elasticity and low in abrasion resistance. On the other hand, urethane has good elasticity, high resistance to abrasion, and excellent solvent resistance.

The acrylic monomer is preferably 30% by weight, and at higher weight%, the elasticity decreases and becomes harder, and thus the wear characteristics may be lowered, and the mixing of the acrylic monomer and the urethane oligomer may not be sufficiently intimate. It may cure to show two phases, but rather lower the physical properties of the film. The acrylic monomer is preferably 20 to 30% by weight so that surface cracking does not occur when bending the panel while securing sufficient hardness to be used as a building exterior panel by the acrylic monomer. On the other hand, urethane is less resistant to moisture such as rain and snow than acryl, and when the content of acrylate monomer is 30% by weight, the degree of moisture absorption is reduced by half compared to pure urethane, thereby securing weather resistance required for exterior panels. have.

As a main factor in determining the properties of the UV coating layer 100, the urethane oligomer imparts abrasion resistance, toughness and bendability to the UV coating layer 100. The aluminum exterior panel according to the embodiment of the present invention is formed with a UV coating layer 100 including a urethane oligomer, even if the exterior panel is bent the edge of the panel to be mounted on the outer wall of the building transfer coating layer 11 and the UV coating layer 100 ) No damage such as cracks). On the other hand, by using a urethane-based oligomer can be expected to increase the adhesive strength to the residual release agent layer 122 and the pattern ink layer 144.

On the other hand, in the use of UV-curable resin paint in the exterior panel, the viscosity of the resin is the most important factor of the physical properties of the paint used for coating applications, ensuring the appropriate viscosity to facilitate the convenience of work or control of the coating film thickness very important. 2-methoxyethanol of one embodiment also serves to ensure the viscosity of the paint and the role of a solvent comprising a prepolymer consisting of a urethane oligomer and an acrylic monomer. 2-methoxyethanol is a tacky solvent. In one embodiment, a stabilization step of stabilizing the applied UV paint after a predetermined time, the first smoothing step (S530) and the first to build a smoothness of the stabilized UV paint by maintaining a temperature 15 ~ 20 ℃ higher than room temperature 1 In the process of performing the second smoothing step (S540) in which a chemical reaction is carried out by the UV lamp to further build the smoothness of the UV paint, the UV resin is used to obtain the thickness uniformity and smoothness of the UV paint applied by using 2-methoxyethanol. Contribute to securing.

UV coating is a painting using a line (automation) such as conveyor conveying. The whole process is performed in a clean room. The conveying conveyor is preferably at a speed of 5-10 m / min, and in one embodiment, conveys at a panel conveying speed of 6 m / min in the thermal transfer process. The coating method may be a curtain coat method or an auto spray application method using a machine.

The UV paint coating stage 220 is applied to the UV-curable paint according to an embodiment on the aluminum panel 14, the transfer is completed. UV paint is supplied at a temperature of 35 ° C., for example, to improve flowability by reducing the viscosity of the paint and apply it to the aluminum panel 14 at a uniform thickness, and have a film-like laminar flow having a width larger than that of the aluminum panel 14. It is applied to the aluminum panel 14 being transferred in laminar flow. In one embodiment, the coating thickness of the UV paint is 70 μm.

The stabilization stage 222 is a step for stabilizing the paint immediately after the application of UV paint is carried out, it is a section to ensure that the applied paint is stabilized by spreading by the viscosity of the paint itself by having a certain period of conveyor transport time.

The first smoothing stage 224 maintains the temperature at a constant level to build a smoothness of the initial UV coating, and the entire dust-free room using a steam boiler, electric heater and IR (Infra-Red, 316) lamp, etc. It is the section to build the initial UV paint smoothness by keeping the temperature constant.

The second smooth stage 226 is a step of generating a second smoothness by chemical reaction of the UV paint using a small amount of the first UV lamp 318, TL (thalium) lamp of low pressure (140 W) The UV lamp consists of a mercury UV lamp with a 365 nm wavelength and a gallium UV lamp with a 420 nm wavelength.

The first drying stage 228 performs a step of first drying the UV paint applied to the aluminum panel 14 by causing a chemical reaction of the UV paint using the second UV lamp 320. It is a high-pressure (1 kW or more) TL lamp section. The UV lamp consists of a mercury UV lamp with a 365 nm wavelength and a gallium UV lamp with a 420 nm wavelength. The first drying stage 229 may be provided with a high speed ventilation system, for example with a wind speed of 38 m / min, to exhaust the internal solvent to be evaporated. By lowering the internal pressure of the drying stage, the internal solvent can be evaporated and dried quickly.

The first UV lamp 318 may operate differently depending on the color of the base ink layer 142.

When the color of the base ink layer 142 is white, UV irradiation may be performed using only a mercury UV lamp, and the darker the color of the base ink layer 142, the more preferably the gallium UV lamp is operated to perform UV irradiation. . When the color of the base ink layer 142 is dark, the ratio of UV light reflected from the base ink layer 142 after the UV coating layer 100 has been reduced is reduced, and the gallium UV lamp providing higher light energy is used together. It is more preferable to establish the smoothness of the UV coating layer (100).

The second drying stage 230 performs a step of completely drying the UV coating applied to the aluminum panel 14 using the light amount of the high pressure third UV lamp 322. A high pressure 13 kW gallium UV lamp, 16.8 kW gallium UV lamp, and 13 kW of mercury UV lamp light quantity is carried out to completely dry the UV coating applied on the aluminum panel (14).

The cooling stage 232 is a section for cooling the dried aluminum panel 14 to room temperature. Then, the inspection (양) of the UV coating layer 100 under the illumination for inspection.

Protective film attachment end 236 is a section for attaching a protective film for protecting the appearance of the aluminum panel 14 in the storage and transportation process to the outside of the completed aluminum panel 14. The protective film is coated with an adhesive that is easy to peel off, and preferably has a thickness of 50 to 100 μm as a PE or PET material.

If the aluminum panel 14 is used to bend the edge, a process of performing a V-cutting process in advance in the bent portion in the step before attaching the protective film may be added.

In one embodiment, a single aluminum panel 14 has been described, but a sandwich structure panel in which a foamed resin layer is formed, for example, for thermal insulation, and the aluminum panel is bonded to both sides may also be included in the scope of the present invention.

The above description is merely illustrative of the technical idea of the present embodiment, and those skilled in the art to which the present embodiment belongs may make various modifications and changes without departing from the essential characteristics of the present embodiment. Therefore, the present embodiments are not intended to limit the technical idea of the present embodiment but to explain, and the scope of the technical idea of the present embodiment is not limited by these embodiments. The scope of protection of the present embodiment should be interpreted by the following claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present embodiment.

Claims (11)

A panel preheating stage for preheating the panel to a first temperature;
A thermal transfer film feed end;
A thermal transfer step of thermally transferring a transfer film including a print layer including a base ink layer and a vinyl layer separated after transfer on the panel, the first roller heated to a second temperature higher than the first temperature, and the A thermal transfer stage in which transfer is performed by a thermal transfer roller stage including a second roller heated to a third temperature higher than a second temperature;
A release paper release end that separates the vinyl layer from the thermally transferred panel to complete thermal transfer; And
A UV coating stage for forming a UV coating layer on the panel on which thermal transfer is completed, the UV coating stage including a smoothing stage configured to irradiate more UV light energy as the reflectance of the color of the base ink layer is smaller;
In the exterior panel manufactured by the manufacturing apparatus comprising a,
The UV coating layer is a resin of 20 to 30% by weight of acrylic monomer, 30 to 40% by weight of urethane oligomer, 10 to 20% by weight of 2-methoxyethanol and 10 to 20% by weight of isopropyl alcohol. Mixed
Exterior panel characterized in that. The method of claim 1,
The UV coating stage,
UV paint coating step for applying a UV paint on the panel the thermal transfer is completed;
A stabilization stage for stabilizing the applied UV paint after a predetermined time;
The first smooth stage to build the smoothness of the UV paint stabilized by maintaining a temperature 15 ~ 20 ℃ higher than room temperature, and the second smooth stage to further build the smoothness of the UV paint by chemical reaction with the first UV lamp Including, the smoothing stage;
A first drying stage for first drying the UV paint with a second UV lamp;
A second drying stage for completely drying the UV paint with a third UV lamp; And
Cooling stage to cool the completely dried panel to room temperature
Exterior panel comprising a. The method of claim 1,
The transfer film,
The vinyl layer;
A release agent layer laminated on the vinyl layer; And
Adhesive layer laminated on the printed layer
Including,
The printing panel is laminated between the release agent layer and the adhesive layer. The method of claim 3, wherein
The print layer is
The exterior panel further comprising a pattern ink layer stacked on the base ink layer. The method of claim 1,
The thermal transfer roller end,
And a third roller heated to a fourth temperature higher than the third temperature. The method of claim 5,
The second temperature is 195 to 205 ℃,
The third temperature is 205 to 215 ℃,
The fourth temperature is an exterior panel, characterized in that 225 to 235 ℃. The method of claim 2,
The first UV lamp, the second UV lamp and the third UV lamp,
Mercury UV lamp with a wavelength of 365 nm and gallium UV lamp with a wavelength of 420 nm,
The first UV lamp is a low pressure of 140 W,
The second UV lamp is a high pressure of 1 kW,
The third UV lamp is an external panel, characterized in that the ultra-high pressure of 13 ~ 16.8 kW. The method of claim 7, wherein
The first UV lamp,
If the base ink layer is a light color and reflectance is 50% or more, only the mercury UV lamp is activated,
And the gallium UV lamp is operated together with the mercury UV lamp when the base ink layer is dark and reflectance is less than 50%. The method of claim 1,
If the panel is an aluminum panel, the first panel is characterized in that the first temperature is 75 to 85 ℃. delete The method of claim 1,
Exterior panel characterized in that it further comprises a V-cutting end to be bent after the UV coating layer is the exterior panel in which the UV coating layer is formed.

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