KR20230082003A - Panel for signboard and method manufacturing thereof - Google Patents

Abstract

The purpose of the present invention is to provide a panel for signboards, which includes a metal layer to have excellent strength and weather resistance while having excellent surface quality, such as excellent adhesion and high smoothness. Provided is a panel for signboards, sequentially comprising a surface film, an urethane-based adhesive layer, and a composite substrate, wherein the composite substrate includes a metal layer and a resin base layer, the metal layer is disposed on the urethane-based adhesive layer side, and the metal layer is disposed on the urethane-based adhesive layer side, an uneven surface including an uneven pattern.

Description

Advertising signboard panel and its manufacturing method {PANEL FOR SIGNBOARD AND METHOD MANUFACTURING THEREOF}

The present invention relates to a panel for an advertisement signboard and a manufacturing method thereof.

In general, advertising signboards include a structure of a film, an adhesive, and a substrate layer representing an image of a company's name or product, and are installed inside and outside a building to advertise and publicize the company's name or product.

The condition of advertising signs can affect the publicity and image of companies and products. Therefore, the surface of the film displaying the company's name or product must be flat without being damaged, and the advertising signboard is required to exhibit excellent adhesion.

In addition, advertising signboards are required to be usable for a long period of time even in an external environment. For example, outdoor signboards are required to have weather resistance of 5 years or more. To this end, it may be desired to impart excellent strength and weather resistance by including a metal layer to the advertising signboard. On the other hand, in relation to the surface film due to the adhesive, the metal layer may have a problem of deterioration in quality, such as deterioration in adhesion and uneven expression of the surface film.

An object of the present invention is to provide a panel for an advertising signboard having excellent surface quality, such as exhibiting excellent strength and weather resistance, including a metal layer, and at the same time, exhibiting excellent adhesion, and having high smoothness by minimizing the surface roughness of the surface film.

Another object of the present invention is to provide a method for manufacturing the panel for the advertising signboard.

The objects of the present invention are not limited to the above-mentioned objects, and other objects and advantages of the present invention not mentioned above can be understood by the following description and will be more clearly understood by the examples of the present invention. It will also be readily apparent that the objects and advantages of the present invention may be realized by means of the instrumentalities and combinations indicated in the claims.

A surface film according to the present invention, a urethane-based adhesive layer and a composite substrate are sequentially included, the composite substrate includes a metal layer and a resin substrate layer, the metal layer is disposed on the side of the urethane-based adhesive layer, and the metal layer is the urethane-based On the side of the adhesive layer, it is possible to provide a panel for an advertisement signboard including a concave-convex surface including a concave-convex pattern.

In addition, in the composite substrate comprising a metal layer and a resin substrate layer according to the present invention, forming a concave-convex pattern on the metal layer to form a concave-convex surface on one surface of the metal layer; forming a urethane-based adhesive layer by applying a urethane-based adhesive to the uneven surface of the metal layer; Applying primary heat to one side of the surface film while unwinding the surface film from the take-up roll; And it is possible to provide a method for manufacturing a panel for an advertising signboard comprising a; step of laminating the surface film on the urethane-based adhesive layer by applying secondary heat and pressure while disposing the surface film.

The panel for advertising signs according to the present invention includes a metal layer and exhibits excellent strength and weather resistance, and at the same time, it can exhibit excellent adhesion and excellent surface quality of the laminated body.

In addition, the method of manufacturing a panel for an advertising signboard according to the present invention can provide the panel for an advertising signboard.

In addition to the effects described above, specific effects of the present invention will be described together while explaining specific details for carrying out the present invention.

1 is a schematic diagram schematically showing a cross-section of a panel for an advertisement signboard according to an embodiment of the present invention.
2 is a schematic diagram schematically illustrating a concave-convex pattern formed on a concave-convex surface of a metal layer of a panel for an advertising signboard according to an embodiment of the present invention.
3 is a schematic diagram schematically illustrating a method of manufacturing a panel for an advertisement signboard according to another embodiment of the present invention.

The above objects, features and advantages will be described later in detail with reference to the accompanying drawings, and accordingly, those skilled in the art to which the present invention belongs will be able to easily implement the technical spirit of the present invention. In describing the present invention, if it is determined that the detailed description of the known technology related to the present invention may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted. Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to indicate the same or similar components.

Hereinafter, the arrangement of an arbitrary element on the "upper (or lower)" or "upper (or lower)" of a component means that an arbitrary element is placed in contact with the upper (or lower) surface of the component. In addition, it may mean that other components may be interposed between the component and any component disposed on (or under) the component.

Hereinafter, a panel for an advertisement signboard according to some embodiments of the present invention will be described.

One embodiment of the present invention sequentially includes a surface film, a urethane-based adhesive layer, and a composite substrate, wherein the composite substrate includes a metal layer and a resin substrate layer, the metal layer is disposed on the side of the urethane-based adhesive layer, and the metal layer is , To the side of the urethane-based adhesive layer, provides a panel for advertising signboards including a concave-convex surface including a concave-convex pattern.

Typically, advertising signboards use a lot of urethane-based adhesives between the surface film and the substrate layer. In addition, the urethane-based adhesive may function as an adhesive by reacting as shown in Formula (1) below. That is, since the urethane-based adhesive requires water as a reactant and generates gas (CO 2 ) as a reaction product, a passage through which water enters and gas is discharged is required.

[Equation 1]

NOC-R-CON + H2O → NOC-R-NH2 + CO2

NOC-R-NH2 + NOC-R-CON → NOC-R-NH-CO-NH-R-CON

Here, R may be a hydrocarbon group.

Conventionally, plywood such as MDF (medium density fiberboard) having pores in which pores are connected to form a passage has been used as the substrate layer of the advertising signboard, so that water and gas can move through the passage, There was no particular problem in using the urethane-based adhesive.

On the other hand, advertising signboards are required to be usable for a long period of time even in an external environment. For example, outdoor signboards are required to have weather resistance of 5 years or more. To this end, it may be desired to impart excellent strength and weather resistance by including a metal layer to the advertising signboard.

On the other hand, metals do not have passages such as pores unless they are perforated, so moisture necessary for the curing reaction of urethane-based adhesives cannot be supplied, and gas, which is a reaction product, cannot be discharged. There is a problem that the surface quality of the signboard is deteriorated. And, when perforating a metal, the strength and the like are lowered.

The advertising signboard panel includes a metal layer to impart excellent strength and weather resistance, and includes a concave-convex surface including a concave-convex pattern on the metal layer to exhibit excellent adhesive strength and excellent surface quality while including a urethane-based adhesive layer.

1 is a schematic diagram schematically showing a cross-section of a panel for an advertisement signboard according to an embodiment of the present invention. As shown in Figure 1, the panel for advertising signs of the present invention sequentially includes a surface film, a urethane-based adhesive layer, and a composite substrate from the top, and the composite substrate includes a metal layer and a resin substrate layer. At this time, the metal layer is disposed on the side of the urethane-based adhesive layer, and the metal layer includes a concave-convex surface including a concave-convex pattern on the side of the urethane-based adhesive layer.

Specifically, the composite substrate includes a resin substrate layer and a metal layer laminated on one surface of the resin substrate layer. The metal layer may be laminated on both surfaces with the resin substrate layer interposed therebetween, so that the composite substrate may have a sandwich structure (not shown).

The advertising signboard panel includes a resin base layer. Specifically, the resin base layer may be a polyolefin resin base layer filled with a polyolefin resin selected from the group consisting of polyethylene, polypropylene, polybutylene, and combinations thereof. For example, the resin base layer may include a polyethylene resin base layer, and thus, molding is easy, and high-thickness sheeting (sheeting) of 100 μm or more, that is, film formation may be facilitated. In addition, since the resin has a low glass transition temperature (Tg), it is possible to impart flexibility to the laminated panel, and when an external force is applied to the panel for advertising signboards, it responds elastically to the impact caused by the external force to prevent breakage or bending. can do. In addition, the resin has a low melting point (Tm), is easy to mold and process, and has a low specific gravity, so that the overall weight of the panel for advertising signboards can be reduced.

The resin base layer may further improve weather resistance by further including a flame retardant. In this case, the resin base layer may improve miscibility with the flame retardant material (eg, aluminum hydroxide, etc.) by including the resin. In addition, the resin has a low glass transition temperature (Tg) and a low melting point (Tm) at the same time, and can improve the dispersion of flame retardants and the like.

The thickness of the resin substrate layer may be about 0.5 mm to about 10 mm. For example, it may be 2.6 mm to about 3 mm. When the thickness of the substrate layer is less than the above range, it may not sufficiently support the surface film and the metal layer laminated thereon, and the bending strength may be weak, resulting in poor durability. And, if it exceeds the above range, there may be a problem in that production efficiency is lowered by giving a burden to the manufacturing process.

The advertising signboard panel includes a metal layer on one side of the resin base layer, so that excellent strength and weather resistance can be imparted. Specifically, the metal layer is from the group consisting of aluminum (Al), indium (In), stainless steel, copper (Cu), nickel (Ni), chromium (Cr), cobalt (Co), and combinations thereof. Can contain selected one. Alternatively, the metal layer may be formed by anodizing the metal, depositing another metal, or coated with a functional coating solution.

For example, the metal layer may include aluminum, thereby imparting excellent strength and weatherability in a more economical manner and improving workability. The metal layer may have a thickness of about 0.1 mm to about 0.9 mm and about 0.2 mm to about 0.5 mm. When the thickness of the metal layer is less than the above range, the bending strength of the panel for advertising signs is lowered, and it may be easily damaged by an external force during molding or during installation. In addition, when the thickness of the metal layer exceeds the above range, the weight is excessively increased and the cost is increased, resulting in uneconomical problems.

The metal layer is disposed on the side of the urethane-based adhesive layer and attached to the surface film. When the composite substrate has a sandwich structure, one of the metal layers may be disposed on the side of the urethane-based adhesive layer and attached to the surface film.

The urethane-based adhesive layer includes a urethane-based adhesive. Urethane-based adhesives are a two-component type in which a curing agent containing a difunctional or higher functional aromatic or aliphatic isocyanate is applied to a subject containing polyol, and a prepolymer that leaves an NCO group at the end, and the NCO group is capped with an OH group. There is a one-component type that is in the form of polyol, which is blocked by blocking it, and provides eco-friendliness. For example, the two-component urethane-based adhesive is a polyol, and polyether polyol, low molecular weight glycols, or a combination thereof may be used. As the polyether polyol, polybutadiene diol, polytetramethylene ether glycol, polypropylene oxide glycol, polypropylene oxide triol, polybutylene oxide glycol, polybutylene oxide trione, and combinations thereof may be used. Examples of the low molecular weight glycols include 1,4-butanediol, 1,3-butanediol, 1,6-hexanediol, ethylene propylene glycol, diethylene glycol, dipropylene glycol, neopentyl glycol, and combinations thereof. . The isocyanate is methylenediphenyl diisocyanate (MDI), 1,6-hexamethylene diisocyanate (HDI), p-phenylene diisocyanate (p-phenylene diisocyanate, PPDI), Toluene diisocyanate (TDI), 1,5-naphthalene diisocyanate (NDI), isophoron diisocyanate (IPDI), cyclohexylmethane diisocyanate (H12MDI) At least one compound selected from the group consisting of xylene diisocyanate (XDI), norbornane diisocyanate (NBDI), trimethyl hexamethylene diisocyanate (TMDI), and combinations thereof can include The isocyanate may be included in an amount of 10 to 60% by weight. The two-component urethane-based adhesive may further include an elasticity supplement to improve elongation.

The urethane-based adhesive layer includes a one-component urethane-based adhesive instead of a two-component urethane-based adhesive, so that environmental friendliness can be imparted to the panel for advertising signboards. The one-component urethane-based adhesive is a reaction product of a polyol and polyisocyanate, and may be a polyurethane oligomer having an isocyanate group at both ends. As described above, a high molecular weight poly It hardens while making urethane, and as a reaction derived from it, a urea reaction (urea reaction) is created. The isocyanate (NCO) value of the one-component urethane-based adhesive may be 2 to 90% or 2 to 7%.

The thickness of the urethane-based adhesive layer may be about 0.1 μm to about 100 μm. When the thickness of the adhesive layer is less than the above range, there is a problem of insufficient adhesive strength, and when it exceeds the above range, formability is deteriorated and bubbles may be excessively generated, thereby degrading the quality of the product, especially There may be a problem in that securing sufficient air permeability becomes impossible. The thickness of the urethane-based adhesive layer may be, for example, about 1 μm to about 30 μm, and, if necessary, may have a thickness of 100 μm or more.

The metal layer includes a concave-convex surface including a concave-convex pattern toward the urethane-based adhesive layer. The metal layer is properly supplied with moisture necessary for the curing process of the urethane-based adhesive without applying a separate perforation, that is, without a passage such as a hole, by the concavo-convex pattern, so that the adhesive reacts smoothly, resulting in excellent bond strength can represent In addition, it is possible to provide excellent appearance quality and excellent adhesion strength by discharging gas, which is a reaction product, to prevent the surface of the surface film from being uneven or raised due to bubbles formed by the gas. Another surface of the metal layer facing the resin substrate layer may form a flat surface.

The metal layer may include an air channel formed by the concavo-convex pattern. The air channel may be formed along a concave portion formed by a concavo-convex pattern, or along a deepest valley in the concave portion. Accordingly, the concavo-convex surface increases the contact area with the adhesive with a large surface area, and facilitates the discharge of moisture required by the reaction of the urethane-based adhesive and gas formed by the reaction to prevent the surface film from lifting, resulting in more improved initial and long-term adhesion strength can be indicated. The irregularities may be formed through brushing using a sandpaper or the like. As shown in FIG. 1 , the air channel may be formed along a part of the concave portion or may be formed along the entire concave portion formed by irregularities.

The uneven pattern may include first scratches unidirectionally oriented in a first direction. Here, being unidirectionally oriented includes, for example, a state in which the two first scratches are perfectly parallel to each other, as well as a state in which there is no intersection point due to an error range that is difficult to identify when viewed with the naked eye, or a state in which there is no intersection point It should be understood that The scratches may continuously exist without being interrupted in an alignment direction from one end to the other end of the uneven surface. Through this, the gas generated in the middle of the film can be well discharged.

2 is a schematic diagram schematically illustrating a concave-convex pattern formed on a concave-convex surface of a metal layer of a panel for an advertising signboard according to an embodiment of the present invention. The uneven pattern may include first scratches unidirectionally oriented in a first direction and second scratches unidirectionally oriented in a second direction.

An alignment direction of the first direction and an alignment direction of the second direction may have a structure that is crossed with each other. Accordingly, the first scratch and the second scratch may have one or more intersection points. Specifically, in the concavo-convex pattern, an intersection angle between the alignment direction in the first direction and the alignment direction in the second direction may be 0.5° to 90°. Alternatively, the crossing angle may be 5 ° to 90 ° or 15 ° to 90 °. For example, when the intersection angle between the first direction and the second direction is 90°, the first scratch and the second scratch may form a mesh-like shape.

The concavo-convex pattern includes first scratches unidirectionally oriented in a first direction and second scratches unidirectionally oriented in a second direction, as described above. Accordingly, the advertising signboard panel may include air channels having orientations in two or more different directions along the concave portion formed by the first scratch and the second scratch. Thus, gas can be discharged smoothly, and not only improved adhesion strength but also excellent surface quality can be imparted. For example, when a scratch is cut in the middle or only a one-way channel is formed with a hairline, one part of the channel is easily clogged in the process of forming an adhesive layer by applying an adhesive, and thus the entire channel is blocked, increasing the adhesive strength. There may be a problem of deterioration and deterioration of surface quality.

Specifically, the uneven surface may include a plurality of grooves and a plurality of flat parts. The plurality of grooves may have a predetermined width and depth, and may be disposed between the plurality of flat parts. The depth of the groove is based on a direction perpendicular to the plane of the concavo-convex surface of the metal layer. The concavo-convex surface may not include a protrusion protruding from the surface of the metal layer. Accordingly, it is possible to have high smoothness by preventing the surface of the surface film from becoming uneven due to protrusions on the concave-convex surface.

Specifically, the average depth D of the irregularities formed on the uneven surface E may be about 350 nm to about 1,500 nm, and the average width W of the irregularities may be about 0.5 μm to about 50 μm. For example, the average depth (D) of the irregularities may be about 350 nm to about 800 nm or about 600 nm to about 800 nm, and the average width (W) is about 3 μm to about 11.5 μm or about 3 μm to about may be 9 μm. The unevenness may include an average depth and width within the above ranges to control an adhesive area with the urethane-based adhesive and form an appropriately sized air channel. The average depth and width of the irregularities may be measured using a Confocal Laser Scanning Microscope (CLSM).

Specifically, when the average depth of the concavo-convex is less than the above range, the adhesive is easily filled in the concavo-convex and air channels are not formed, and thus, the reaction product of the urethane-based adhesive is not discharged, resulting in a raised or uneven appearance of the film surface. The quality may be damaged, and there may be a problem of easy peeling due to a small adhesive area. And, when the average depth of the unevenness exceeds the above range, gas may be easily discharged, but there may be a problem in that the adhesive strength decreases as the empty space between the adhesive layer and the metal layer increases. And, when the average width of the unevenness is less than the above range, it is not easy to fill the adhesive, and the contact area between the adhesive and the metal layer is not sufficient, so that the adhesive is easily peeled off and the adhesive strength is lowered. In addition, when the average width of the irregularities exceeds the above range, the adhesive is easily filled in the valleys and air channels are not formed, and accordingly, the gas, which is a reaction product of the urethane-based adhesive, is not discharged, so that the surface of the film is raised or bumpy. Appearance quality may be impaired.

The advertising signboard panel includes an air channel formed along the concave portion formed by the first scratch and the second scratch, and may exhibit excellent adhesion strength and excellent surface quality while including a urethane-based adhesive layer. When air channels are present in panels for advertising signboards, water is absorbed by capillary action when the panels are immersed in water. Accordingly, it is possible to check the size of the air channel through the water absorption rate of the panel.

The water absorption rate of the advertising signboard panel according to Equation 1 below may be 0.3% to 4%. Since the panel for advertising signboards has a water absorption rate within the above range, it can be confirmed that air channels of an appropriate size exist. For example, when the water absorption rate is less than the above range, the surface of the surface film may be bumpy due to bubbles, or the surface may be lifted, and the adhesive strength may be lowered. And, in the case of exceeding the above range, there may be a problem such as easily detached by an external force, the adhesive strength between the surface film and the metal layer is significantly reduced.

[Equation 1]

Water absorption rate (%) = (|Final weight of panel (Wt)- Initial weight of panel (Wo)|/ Initial weight of panel (Wo)) X 100

In Equation 1, Wo is the initial weight of the 10 cm (width) X 10 cm (length) advertising signboard panel before being immersed in water, and Wt is the advertising signboard panel in water at room temperature (25 ℃) It means the final weight (Wt) of the advertising sign panel after soaking for 24 hours and then drying at 50° C. for 24 hours.

The surface film may include a vinyl chloride resin layer and an acrylic resin layer, and the vinyl chloride resin layer may be attached to the urethane-based adhesive layer. The surface film has a vinyl chloride resin layer containing polyvinyl chloride (PVC) on the surface attached to the urethane adhesive layer, so that the acrylic resin layer exposed to the outside is flat and maintains an excellent surface appearance with high smoothness While doing so, the vinyl chloride resin layer can modify the surface state of the vinyl chloride resin layer by the first heat described later and further improve the adhesive strength by the anchor effect by heat in relation to the adhesive layer. In addition, by disposing an acrylic resin layer containing polymethyl methacrylate (PMMA) on the vinyl chloride resin layer, high contamination resistance may be exhibited. The surface film may have a thickness of about 50 μm to about 250 μm. And, the thickness of the vinyl chloride resin layer may be about 45㎛ to about 245㎛. When the thickness of each layer is less than the above range, durability may be deteriorated, and when the thickness exceeds the above range, there may be a problem in that the layer is easily detached due to shrinkage or the like due to heterogeneous adhesion.

The adhesive strength of the advertising signboard panel having the above structure may be about 2.8 Kgf/inch2 to about 15 Kgf/inch2. or from about 4 Kgf/inch2 to about 15 Kgf/inch2. Accordingly, even when installed on the outer wall of a building exposed to the external environment, the panel for advertising signs can maintain excellent adhesion strength for a long time. In particular, even when the panel for advertising signboards includes a one-component urethane-based adhesive as the urethane-based adhesive layer, excellent adhesion strength within the above range can be imparted. In general, a one-component urethane-based adhesive has poor adhesion strength compared to a two-component urethane-based adhesive. Therefore, it is difficult to use a one-component urethane-based adhesive that imparts eco-friendliness to an advertising signboard panel installed on an outer wall of a building that is easily exposed to the external environment. On the other hand, the advertising signboard panel includes a one-component urethane-based adhesive as a urethane-based adhesive layer to impart eco-friendliness, and by having the above structure, it can exhibit eco-friendliness, excellent adhesion strength, and excellent surface quality at the same time.

Another embodiment of the present invention, in the composite substrate including a metal layer and a resin substrate layer, forming a concave-convex pattern on the metal layer to form a concave-convex surface on one surface of the metal layer; forming a urethane-based adhesive layer by applying a urethane-based adhesive to the uneven surface of the metal layer; While unwinding the surface film from the take-up roll. Applying a first heat to one surface of the surface film; and laminating the surface film on the urethane-based adhesive layer by applying secondary heat and pressure while disposing the surface film.

Conventional panels for advertising signboards are manufactured using an oven, and the process is complicated and thus uneconomical. Meanwhile, the method for manufacturing a panel for a billboard can manufacture a desired panel for a billboard without using an oven.

As described above, by the above manufacturing method, it is possible to manufacture a panel for an advertisement signboard having excellent surface quality, such as excellent strength and weather resistance, and at the same time, excellent adhesion and improved smoothness of the surface film.

3 is a schematic diagram schematically illustrating a method of manufacturing a panel for an advertisement signboard according to another embodiment of the present invention. The manufacturing method is described below.

First, in the composite substrate including a metal layer and a resin substrate layer, forming a concave-convex pattern on the metal layer to form a concave-convex surface on one surface of the metal layer.

Matters related to the concavo-convex pattern are as described above.

Then, a step of forming a urethane-based adhesive layer by applying a urethane-based adhesive to the uneven surface of the metal layer.

The urethane-based adhesive may have a viscosity of about 5,500 cps to about 10,000 cps at 120 °C. The urethane-based adhesive is applied to a metal layer having high thermal conductivity, and when applied to the metal layer, the viscosity may increase rapidly while the temperature decreases rapidly. The manufacturing method is to adjust the viscosity of the urethane-based adhesive to the above range in consideration of this. Accordingly, the urethane-based adhesive is appropriately applied to the concave-convex surface of the metal layer to impart excellent adhesive strength and maintain an appropriate air channel formed along the concave portion. For example, when the viscosity of the urethane-based adhesive is less than the above range, the adhesive is completely filled in the concavo-convex groove and no air channel is formed, and when the viscosity exceeds the above range, adhesion may be reduced. The urethane-based adhesive may be applied to the uneven surface of the metal layer in a roll-to-roll manner to form a urethane-based adhesive layer.

And, while unwinding the surface film from the winding roll on which the surface film is wound, applying a first heat to one surface of the surface film. The surface film maintains a constant tension while being guided through a guide bar toward the urethane-based adhesive layer. At this time, by applying the first heat to one surface of the surface film, it is possible to impart ductility to the film and improve the degree of flatness of the surface of the surface film. Accordingly, it is possible to further improve the attachment strength of the advertising signboard panel.

The first heat may be applied using an infrared heater (IR heater) at a temperature higher than the glass transition temperature (Tg) of the surface film. For example, the first heat may be applied to the vinyl chloride resin layer at a temperature of about 50 °C to about 80 °C for about 2 seconds to about 15 seconds.

Finally, a step of laminating the surface film on the urethane-based adhesive layer by applying a second heat and pressure while disposing the surface film.

While disposing the surface film on the urethane-based adhesive layer, the advertising signboard panel may be manufactured by passing it between rollers disposed up and down. In this case, the roller may be a rubber roller, and secondary heat and pressure may be applied using the rubber roller. Second, the second heat may be at a temperature of about 70 °C to about 100 °C. And, the pressure may be about 1 kpa to about 10 kpa. For example, it may be about 3 kpa to about 7 kpa.

In the manufacturing method, by adjusting the secondary heat and pressure to the above range with a rubber roller, the viscosity of the urethane-based adhesive is lowered to fill the air channels or to prevent the air channels from being filled with the urethane-based adhesive due to the pressure. That is, while maintaining the shape of the concave-convex pattern described above to increase adhesion strength, it is possible to exhibit excellent surface appearance quality. Specifically, when the heat and pressure are less than the above range, the adhesive strength is reduced, and when the above range is exceeded, there may be a problem in that the urethane-based adhesive is filled in the valleys of the concave-convex pattern and air channels are not formed.

(Example)

Example 1:

A composite substrate having a sandwich structure in which a 0.2 mm thick aluminum foil, a 2.6 mm thick polyethylene resin substrate layer, and a 0.2 mm thick aluminum foil were sequentially laminated was prepared. In addition, a concave-convex pattern was formed on the surface of one of the aluminum foils through brushing to form a concave-convex surface on the outer surface of the metal layer. At this time, the concave-convex pattern includes a first scratch unidirectionally oriented in a first direction and a second scratch oriented unidirectionally in a second direction, and the first direction and the second direction are crossed so that the intersection angle is 90 °. formed. In addition, the concave portion formed on the uneven surface had an average depth of 648.82 nm and an average width of 6.2 μm.

Thereafter, a one-component urethane-based adhesive (Henkel) having a viscosity of 10,000 cps was applied to the uneven surface of the metal layer in a roll-to-roll manner at 120° C. to form a urethane-based adhesive layer having a thickness of 30 μm.

Then, while unwinding the surface film from the winding roll of the surface film having a thickness of 200 μm including a vinyl chloride resin (PVC) layer and an acrylate layer (PMMA), the polyvinyl chloride resin (PVC) layer of the surface film A first heat of 80° C. was applied for 7 seconds by an infrared heater. And, while the surface film was placed on the urethane-based adhesive layer on which the composite substrate was laminated, it was laminated by applying a pressure of 5 kpa with a rubber roll along with secondary heat of 80 ° C. Accordingly, a panel for an advertisement signboard having an air channel formed along the concave portion formed by the first scratch and the second scratch was manufactured.

Comparative Example 1 : (without irregularities)

Except for forming a concave-convex pattern on the metal layer and directly applying a one-component urethane-based adhesive in a roll to roll manner on the surface of the metal layer that does not contain concavo-convex convexities to form a urethane-based adhesive layer, the above embodiment A panel for an advertisement signboard was manufactured in the same manner as in Example 1.

evaluation

Experimental Example 1: Measuring the degree of air channel formation (moisture absorption rate)

A specimen of 10 cm (width) X 10 cm (length) was prepared by cutting the advertising signboard panels of Examples and Comparative Examples, and the initial weight (Wo) of the specimen was measured. Then, the specimen was immersed in water at room temperature (25° C.) for 24 hours. Then, after drying at 50 °C for 24 hours, the final weight (Wt) of the specimen was measured.

Then, according to the following [Equation 1], the absorption rate of moisture absorbed by the capillary action by the air channels formed in the advertising signboard panel was confirmed.

[Equation 1]

Water absorption rate (%) = (|Final weight of panel (Wt)-Initial weight of panel (Wo)|/ Initial weight of panel (Wo)) X 100

Experimental Example 2: Lifting of the film surface

Advertising sign panels of Examples and Comparative Examples were left in an oven at 80° C. for 300 hours. After that, the surface of the surface film of the advertising signboard panel was evaluated according to the following criteria by visually observing and tactile whether or not a lifting phenomenon caused by bubbles (including a phenomenon in which the surface becomes uneven due to bubbles) occurs on the surface of the surface film.

<Evaluation Criteria>

○: Lifting is observed with the naked eye and felt by touch.

Δ: Lifting is not observed with the naked eye, but is felt by the touch of the hand.

Х: Lifting is not observed with the naked eye or by touch.

Experimental Example 3: Attachment strength

According to the standards of PSTC-1, it was measured under the 180° Peel test condition using a TA peeler.

water absorption rate Whether or not there is a lifting phenomenon adhesion strength Example 1 1.78% X 4.8 kgf/in Comparative Example 1 0.02% O 1.2 kgf/in

As shown in the table above, Example 1 has a water absorption rate above a certain level, and accordingly, no lifting phenomenon is observed on the surface, and it can be confirmed that it has excellent adhesion strength. Although described with reference to the drawings, the present invention is not limited by the embodiments and drawings disclosed herein, and it is obvious that various modifications can be made by a person skilled in the art within the scope of the technical spirit of the present invention. In addition, although the operation and effect according to the configuration of the present invention have not been explicitly described and described while describing the embodiments of the present invention above, it is natural that the effects predictable by the corresponding configuration should also be recognized.

100: surface film
200: urethane-based adhesive layer
300: composite substrate
10: metal layer
20: resin base layer
30 air channel
1: Groove
2: flat part
H: concave
D: Depth
W: width
P: concavo-convex pattern
E: uneven surface
S1: first scratch
S2: Second scratch

Claims (14)

sequentially including a surface film, a urethane-based adhesive layer, and a composite substrate;
The composite substrate includes a metal layer and a resin substrate layer, the metal layer is disposed on the side of the urethane-based adhesive layer,
The metal layer includes a concave-convex surface including a concave-convex pattern toward the urethane-based adhesive layer.
Panels for advertising signs.
According to claim 1,
The concavo-convex pattern includes a first scratch unidirectionally oriented in a first direction.
Panels for advertising signs.
According to claim 2,
The concavo-convex pattern further includes a second scratch unidirectionally oriented in a second direction, and the first direction and the second direction have a structure crossed with each other
Panels for advertising signs.
According to claim 1,
The metal layer includes an air channel formed by the concavo-convex pattern.
Panels for advertising signs.
According to claim 3,
In the concave-convex pattern, the intersection angle between the first direction and the second direction is 0.5 ° to 90 °
Panels for advertising signs.
According to claim 1,
The average depth of the irregularities is 350 nm to 1,500 nm, and the average width of the irregularities is 0.5 μm to 50 μm.
Panels for advertising signs.
According to claim 1,
The moisture absorption rate of the advertising signboard panel according to the following formula 1 is 0.3% to 4%
Panels for advertising signs:

[Equation 1]
Water absorption rate (%) = (|Final weight of panel (Wt)-Initial weight of panel (Wo)|/ Initial weight of panel (Wo)) X 100

In Equation 1, Wo is the initial weight of the 10 cm (width) X 10 cm (length) advertising signboard panel before being immersed in water, and Wt is the advertising signboard panel in water at room temperature (25 ℃) It means the final weight (Wt) of the advertising sign panel after soaking for 24 hours and then drying at 50° C. for 24 hours.
According to claim 1,
The metal layer may include one selected from the group consisting of aluminum (Al), indium (In), stainless steel, copper (Cu), nickel (Ni), chromium (Cr), cobalt (Co), and combinations thereof. including
Panels for advertising signs.
According to claim 1,
The surface film includes a vinyl chloride resin layer and an acrylic resin layer, and the vinyl chloride resin layer is attached to the urethane-based adhesive layer.
Panels for advertising signs.
According to claim 1,
The urethane-based adhesive layer comprises a one-component urethane-based adhesive
Panels for advertising signs.
According to claim 1,
The adhesive strength is 2.8 kgf/inch2 to 15 Kgf/inch2
Panels for advertising signs.
In the composite substrate including a metal layer and a resin substrate layer, forming a concavo-convex pattern on the metal layer to form a concavo-convex surface on one surface of the metal layer;
forming a urethane-based adhesive layer by applying a urethane-based adhesive to the uneven surface of the metal layer;
Applying primary heat to one side of the surface film while unwinding the surface film from the take-up roll; and
Laminating by applying a second heat and pressure while disposing the surface film on the urethane-based adhesive layer; comprising
A method of manufacturing panels for advertising signs.
According to claim 12,
The urethane-based adhesive has a viscosity of 5,500 to 10,000 cps at 120 ° C.
A method of manufacturing panels for advertising signs.
According to claim 12,
The pressure is applied at a pressure of 1 kPa to 10 kPa using a rubber roll.
A method of manufacturing panels for advertising signs.

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