KR20180003845A - Method for manufacturing sign having thick coating of synthetic resin - Google Patents

Abstract

The present invention relates to a method for manufacturing a sign having synthetic resin thicker coating. According to the present invention, by irradiating an ultraviolet LED on a coated surface at once in a nitrogen atmosphere, a surface and the inside of a coating film are completely cured to have 1.5 mm or more of thicker coating. Therefore, there is an effect of manufacturing various planar and stereoscopic sings, which provides stereoscopic signs and prevents toning and discoloration and yellowing of color actual image sheet can be prevented.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method for manufacturing a sign,

The present invention relates to a method for manufacturing a sign, and more particularly, to a method for manufacturing a sign that can be used as a coating film after a synthetic resin coating of 1.5 mm or more.

The signs of signboards are installed inside and / or outside the building and used in various forms to advertise to consumers.

For example, an acrylic plate or the like is cut into a letter or a graphic form, and then subjected to a coloring and anti-discoloration coating process and then used as a planar sign without a separate channel, or a planar sign made of an acryl plate, And is used as a stereoscopic sign.

Here, various techniques have been developed to prevent yellowing of an acrylic plate and prevent discoloration. Among them, Korean Patent No. 10-1138002 discloses a method in which a pigment colorant, a UV absorber, a UV blocker, a hardener and the like are mixed in a transparent filler material on a fixed panel and then dried and cured at room temperature for 4 to 8 hours to form a channel signboard Korean Patent No. 10-1210663 discloses a method of coating a color synthetic resin composition having a UV curable color on a display surface of a transparent material at a thickness of 1 to 1.5 mm and then passing the composition through an ultraviolet curing machine for 10 to 15 seconds Thereby forming a coating film.

The prior art of the prior art has solved the problem that the curing time is longer than 10 hours by filling the epoxy resin into the conventional channel, but since the drying time is required for 4 to 8 hours, there is still a problem that the work efficiency is low, Can be remarkably reduced, and the ultraviolet curing type synthetic resin composition is environmentally protected without generation of volatile organic compounds (VOCs), which is an environmental pollution source, and is excellent in scratch resistance, durability, wear resistance and weather resistance But it is difficult to increase the coating thickness to more than 1.5 mm. However, it is difficult to increase the coating thickness to more than 1.5 mm.

The reason why the coating thickness of the conventional ultraviolet curing type synthetic resin composition is limited to 1.5 mm or less is that mercury, metal halide or gallium UV lamps used as curing UV lamps are irradiated with ultraviolet rays of various wavelengths and the surface of the synthetic resin is first cured , Whereas UV LEDs emit a single wavelength to cure the interior of the resin more quickly, so that no uniform curing occurs on the surface and inside of the UV LED.

Accordingly, there has been a problem in that it is difficult to form a back coating film having a thickness of 1.5 mm or more, which can give a sufficient volume feeling (three-dimensional feeling) to a sign by ultraviolet curing type synthetic resin.

The present invention has been proposed in order to solve the problems of the prior art as described above. Even when the ultraviolet curing type synthetic resin is coated to a thickness of 1.5 mm or more and then cured by irradiating UV LED, the surface and interior are completely cured, The present invention also provides a method for manufacturing a sign having a synthetic resin back coating capable of performing decoloring and yellowing prevention coating of a coloring and color photographing sheet as well as a sign printed with a synthetic resin.

In order to accomplish the above object, the present invention provides a method for manufacturing a sign, comprising: a first step of cutting a sign sheet to produce a desired sign; A second step of coloring the sign shape; And applying the ultraviolet curing type synthetic resin to the colored upper part of the sign pattern, irradiating ultraviolet LEDs of 365 to 405 nm from the application surface of the ultraviolet curing type synthetic resin for a predetermined time at a distance from the application surface of the ultraviolet curing type synthetic resin in a nitrogen atmosphere, And a third step.

Wherein the sign plate is an acrylic plate or polycarbonate (PC) plate, the sign shape is a three-dimensional sign having a channel-less planar sign or channel structure and light emitting means, and in the third step, the application of the ultraviolet- And the irradiation time of the ultraviolet LED is 10 to 60 seconds, according to another aspect of the present invention.

The UV irradiation of the ultraviolet LED in the third step is carried out in a predetermined ultraviolet curing apparatus, and the nitrogen atmosphere is supplied from a nitrogen bomb through the injection nozzle at a pressure of 0.1 to 0.2 MPa at a flow rate of 1 to 2 L / And the internal pressure of the ultraviolet curing unit is maintained at 1 to 2 atm, according to another aspect of the present invention.

The ultraviolet curing device is characterized in that the ultraviolet LED is controlled to be driven by a constant voltage constant current (SMPS) method at a light amount of 1.5 W / cm 2 or more to the coated surface at a distance of 15 cm from the coated surface.

Wherein the sign original plate is an acrylic plate, the sign shape is a channel-less planar sign, the second step is colored with a coloring or color photographing sheet, and in the third step, the application of the ultraviolet- 1.6 to 30 mm, and the coating film has a convex shape in its upper part, according to another aspect of the present invention.

Wherein the sign plate is a polycarbonate (PC) plate, the sign shape is a three-dimensional sign having a channel structure and light emitting means, the channel structure is made of aluminum or polycarbonate (PC) And the coating thickness of the coated surface is convex so that the coated thickness of the coated surface is 1.6 to 30 mm, and the coating film has a convex shape in the third step. .

The channel structure includes left and right frames formed of aluminum, and the left and right frames are arranged in a direction opposite to each other from the bottom to the bottom of the plate for attaching the alpovan sheet, the support plate for supporting the light diffusion cover plate, And a light diffusing lid plate according to the sign shape is inserted between the supporting plate and the light interception plate, and the second step is a step of inserting a coloring or color photographing sheet on the light diffusing lid plate And the third step is characterized in that the ultraviolet curing type synthetic resin is applied on the light diffusion cover plate colored with the coloring or the color fact sheet and the light blocking plate.

The present invention irradiates ultraviolet LED on a coated surface in a nitrogen atmosphere to completely cure both the surface and the interior of the coating film, and it is possible to provide a back coating film having a thickness of 1.5 mm or more, It is possible to manufacture a variety of planar and cubic signatures that can prevent the above-mentioned problems.

1 is a perspective view illustrating a planar sign manufactured according to an embodiment of the present invention.
2 is a cross-sectional view taken along line AA 'of FIG.
3 and 4 are cross-sectional views illustrating the configuration of a stereoscopic sign manufactured according to another embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

The method of manufacturing a sign according to the present invention basically comprises: a first step of cutting a sign sheet to produce a desired sign; A second step of coloring the sign shape; And applying the ultraviolet curing type synthetic resin to the colored upper part of the sign pattern, irradiating ultraviolet LEDs of 365 to 405 nm from the application surface of the ultraviolet curing type synthetic resin for a predetermined time at a distance from the application surface of the ultraviolet curing type synthetic resin in a nitrogen atmosphere, And a third step.

Here, the sign original plate may be an opaque plate such as a tree or a metal, and may be an acrylic plate or a polycarbonate (PC) plate, in addition to various resin plates capable of displaying a predetermined thickness.

The sign original plate is cut to produce a desired sign in the form of letters, figures, etc. constituting the sign (step 1).

As shown in FIG. 1, the sign shape includes a planar sign 1 formed without a channel by simply cutting a sign original plate, and a light emitting means (not shown) 70 "). ≪ / RTI >

Here, in the case of the stereoscopic signatures 2 and 2 ', the channel structure 50 can be made of aluminum or polycarbonate (PC).

3, the channel structure includes left and right frames 42 and 44 made of aluminum, and the left and right frames are formed in a direction opposite to each other, A light shielding plate 45 is integrally formed and attached to the light shielding plate supporting support plate 41 and the light shielding plate support supporting plate 43 and a position 0.5 to 1 mm away from the upper end A light diffusion cover plate 12 made in accordance with the shape of a sign is inserted and fixed between the light blocking plate 45 and an alopone plate 60 having a lamp or LED module 70 fastened to the stone plate 41 May be wrapped around the lower projecting portion 49 and attached by a tack pin or an adhesive.

It is preferable that each of the alpano plate attachment projection 41 and the light diffusing lid plate supporting plate 43 is about 3 mm and the light blocking plate 45 is about 1 mm. Thus, it is possible to fix the light diffusion cover plate 12, and to prevent light from being emitted to the edge of the light diffusion cover plate 12 and causing a shadow or the like on the front side.

The light diffusion cover plate 12 may be made of an acrylic plate, but it is preferably formed of a resin plate such as a polycarbonate (PC) plate having a high degree of light diffusion.

Next, the sign form is painted (second step).

In this case, when the sign shape is a planar sign 1, coloring can be performed by directly applying pigments to the cut sign sheet 10 as shown in FIG. 2 or by attaching the color sight sheet 20, 3, the light-diffusing lid 12 may be thinly colored (not colored layer) on the light-diffusing lid plate 12 as shown in Fig. The color photographing sheet 20 can be attached and colored.

Then, an ultraviolet curing type synthetic resin is applied on the color-coated upper side of the sign shape, and ultraviolet LEDs of 365 to 405 nm are irradiated for a predetermined time at a position vertically distanced from the application surface of the ultraviolet curing type synthetic resin in a nitrogen atmosphere, (Step 3).

Here, the ultraviolet curing type synthetic resin is obtained by slowly heating bisphenol A solid epoxy resin having a molecular weight of 1,700 to 1,800 to 60 to 80 占 폚, mixing hexane diol diacrylate and / or urethane acrylate thereto, And gradually increased to 80 ° C. Then, additives such as acrylic acid, dimethylamine and silicone were added, and then the temperature was raised to 90 ° C. When the pH became 3 or less, the temperature was lowered and the viscosity was measured at room temperature. Share it. The ultraviolet curing type synthetic resin thus prepared was prepared by mixing 30 to 40 wt% of epoxy acrylate oligomer and 3 to 4 wt% of polyester acrylate oligomer, 0.5 to 10 wt% of photoinitiator, 0.01 to 1 wt% of leveling agent, Lt; / RTI >

The application of the ultraviolet curing-type synthetic resin is poured on top of the above-mentioned various sign forms so as to be convex upward by the surface tension so that the middle thickness (t) of the coated surface after curing is adjusted to 1 to 30 mm.

The curing of the ultraviolet curing type synthetic resin is performed by irradiating ultraviolet LEDs of 365 to 405 nm in a nitrogen atmosphere for a predetermined time at a position spaced vertically from the coated surface of the ultraviolet curing type synthetic resin. Thus, in the curing process, the surface and the inside are completely cured even when the coating film becomes thicker than 1.6 mm by irradiating with ultraviolet LED in a nitrogen atmosphere (nitrogen 95% or more) in which oxygen is cut off to the utmost extent to obtain a coating film 30 of convex lens form . It was confirmed by experiment that when the thickness of the coating film is more than 30 mm, the coating film functions almost completely (discoloration and yellowing prevention, convex lens function and aesthetics) .

The irradiation time of the ultraviolet LED may vary depending on the thickness of the coating film and the arrangement of the ultraviolet LED, but the coating film of 1 to 30 mm can be cured within a short time of 10 to 60 seconds.

At this time, the ultraviolet LED is irradiated in an ultraviolet ray curing apparatus having a predetermined closed space for an effective process, which can be performed in any space under a nitrogen atmosphere, and the nitrogen atmosphere is injected from a nitrogen bomb (gas cylinder) And flows into the ultraviolet curing unit through the nozzle at a pressure of 0.1 to 0.2 MPa at a flow rate of 1 to 2 L / min to maintain the internal pressure of the ultraviolet curing unit at 1 to 2 atm.

In addition, the ultraviolet ray curing device preferably has an ultraviolet LED disposed at a distance of 15 cm from the coated surface of the ultraviolet curing type synthetic resin and is controlled to be driven by a constant voltage constant current (SMPS) method at a light amount of 1.5 W / cm 2 or more. This is because the amount of ultraviolet rays is inversely proportional to the square of the distance, and if the light amount is too low or too high, it is difficult to obtain uniform curing within a short time of 10 to 60 seconds Because.

Further, the arrangement of ultraviolet LEDs may be arranged on a plane separated by a distance from the application surface of ultraviolet curing type synthetic resin, and the operation of each ultraviolet LED may be controlled such that only LEDs on the application surface of the synthetic resin of the sign are operated.

Therefore, according to the present invention, it is possible to effectively produce a sign having a synthetic resin back coating having a thickness of 1.5 mm or more, which has been conventionally difficult, as well as coated with protrusions of 1 mm or more on an acrylic sign.

1: planar sign 2, 2 ': cubic sign
10: cut sign sheet 12: light diffusion cover plate
20: Color photographing sheet 30: Coating film
41: an alpaca mounting stone publication 42: a left frame
43: Support plate for supporting the light diffusion cover plate 44: Right frame
45: photometric blocking plate 47: upper protrusion
49: lower protrusion 50: channel
60: Alopane 70: LED module

Claims (7)

A first step of cutting a sign sheet to produce a desired sign shape;
A second step of coloring the sign shape; And
A UV light curing type synthetic resin is applied to the upper part of the colored pattern and then an ultraviolet LED of 365 to 405 nm is irradiated for a predetermined time at a position vertically distant from the application surface of the ultraviolet curing type synthetic resin in a nitrogen atmosphere to cure the coating film The method of claim 1, further comprising:
The method according to claim 1,
The sign original plate is an acrylic plate or polycarbonate (PC) plate,
Wherein the sign shape is a stereoscopic sign having a light-emitting means in a channel-free planar sign or channel structure,
Wherein the coating of the ultraviolet curing type synthetic resin in the third step is such that the center thickness of the coated surface is 1 to 3 mm and the irradiation time of the ultraviolet LED is 10 to 60 seconds.
3. The method according to claim 1 or 2,
The UV irradiation of the ultraviolet LED in the third step is carried out in a predetermined ultraviolet curing apparatus, and the nitrogen atmosphere is supplied from a nitrogen bomb through the injection nozzle at a pressure of 0.1 to 0.2 MPa at a flow rate of 1 to 2 L / Wherein the internal pressure of the ultraviolet curing unit is maintained at 1 to 2 atm.
The method of claim 3,
Wherein the ultraviolet light LED is controlled to be driven by a constant voltage constant current (SMPS) method at a light amount of 1.5 W / cm 2 or more to the coated surface at a distance of 15 cm from the coated surface.
The method of claim 3,
Wherein the sign original plate is an acrylic plate,
Wherein the sign shape is a channel-less planar sign,
The second step is colored with a coloring or colorimetric sheet,
Wherein the application of the ultraviolet curable synthetic resin in the third step is such that the middle thickness of the coated surface is 1.6 to 30 mm, and the coating film has a convex shape.
The method of claim 3,
The sign original plate is a polycarbonate (PC) plate,
The sign shape is a stereoscopic sign having a light emitting means in a channel structure,
The channel structure is made of aluminum or polycarbonate (PC)
The second step is colored with a coloring or colorimetric sheet,
Wherein the application of the ultraviolet curable synthetic resin in the third step is such that the middle thickness of the coated surface is 1.6 to 30 mm, and the coating film has a convex shape.
The method according to claim 6,
Wherein the channel structure includes left and right frames formed of aluminum,
The left and right frames are attached in a direction opposite to each other with a light blocking plate at a position spaced 0.5 to 1 mm away from the upper end of the stone plate for mounting the alpovan plate, the support plate for supporting the light diffusion plate,
And a light diffusion cover plate formed according to the sign shape is inserted between the supporting support plate and the light blocking plate,
The second step is colored with a coloring or colorimetric sheet on the light diffusion cover plate,
Wherein the third step comprises applying the ultraviolet curing type synthetic resin on the light diffusing lid plate colored with the coloring or the color fact sheet and the light blocking plate.

Images