KR101679187B1 - Panel printing method using a thermal transfer and panel printed using the same - Google Patents

Abstract

The present invention relates to a panel printing method using a thermal transfer method and a printed panel using the same and, more specifically, to a panel printing method capable of easily printing an image formed by a plurality of colors on a panel by transferring ink printed by a digital printer and the like on an ink absorbing layer after forming the ink absorbing layer on a panel surface and to use a thermal transfer method having clearness and adhesion by fusing the ink with the ink absorbing layer by infecting the ink with the ink absorbing layer in a heating and compression process of a thermal transfer film and a panel printed by using the same. The panel printing method comprises the steps of: preparing a panel including a printing part which is printed and a non-printing part which is not printed; forming a mask layer on the non-printing part of the panel; forming a first ink absorbing layer by drying the first absorbing layer in 15 to 25C for 5 to 20 minutes after spraying first painting liquid on the printing part of the panel; forming a second ink absorbing layer by spraying second painting liquid on the first ink absorbing layer; forming a third ink absorbing layer by drying the third ink absorbing layer in 70 to 90C for 120 to 150 minutes after spraying the third painting liquid on the second ink absorbing layer; and laminating a thermal transfer film in which ink is printed by a digital printing method on the third ink absorbing layer.

Description

[0001] The present invention relates to a panel printing method using a transfer method and a panel printed using the same,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a panel printing method using a transfer method and a panel printed using the method, and more particularly, to an ink absorbing layer formed on a surface of a panel, Can be easily printed on a panel, and since the ink penetrates into the ink absorbing layer during the heating and pressing process of the transfer film, the panel printing method using the transfer method having a clear and excellent adhesive force and printing Lt; / RTI >

In general, various images are printed using various colors in window glass for display of IT devices such as smart phones and tablet PCs, LCD protective films for IT devices, cases, and battery back covers.

In this way, in order to print on the surface of the print using various colors, the printing operation is completed through a very difficult step for each color. Therefore, a silk screen printing method is mainly used for printing on the surface of printed matter.

However, when printing is performed several times for each color, there is a problem in that the printing state is not so good that the boundary surfaces of different colors are overlapped, so that a clean printing product can not be produced, and also lifting phenomenon occurs at the interface.

In order to solve such a problem, Korean Patent No. 10-1252157 discloses a process of printing on a printed matter through various steps, in which printing is automatically performed while a printed matter is moving, so that a large amount of printed matter can be printed in a short time, A window glass printing apparatus is disclosed in which a cleaner unit is provided to remove foreign matter remaining on a printing pad at any time to obtain a clean printed surface, improve productivity, and produce a high quality printed product.

However, since a silk screen suitable for each color is to be provided on the basis of characteristics unique to silk screen printing, in the case where an image composed of various colors changes frequently as in the past, a number of silks There is a disadvantage that it is troublesome to newly manufacture screen and dispose of existing silk screen, and it is a complication of printing apparatus and process, which causes a rise in manufacturing cost and a weak adhesive force because it is directly printed on a glass surface.

On the other hand, Korean Patent No. 10-1454184 discloses an ink printing implementation method for preventing glass transfer failure including a thermal transfer step of thermally transferring a glass of a display device using a film member having a third and a second ink layer formed thereon .

However, the thermal transfer type printing as in the above-mentioned patent is easier to implement images of various colors than silk screen printing, but it has a disadvantage in that the adhesion is weak when it is directly transferred to the surface of a window glass.

Therefore, it is necessary to develop a printing method that can apply a transfer method that can easily implement various images to a window glass or the like.

1. Korean Patent No. 10-1454184 entitled " Method of Implementing Ink Printing for Preventing Glass Transfer Failure " 2. Korean Patent No. 10-1252157 entitled "Window Glass Printing Apparatus" 3. Korean Registration Practice No. 20-0456840 entitled "Surface Protective Film for Display Device" 4. Korean Patent Registration No. 10-1295251 entitled "

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide an ink absorbing layer on a surface of a panel such as a window glass and then thermally transferring the ink absorbing layer, The present invention provides a panel printing method using a transfer method that can easily print an image composed of a plurality of colors.

It is another object of the present invention to provide a panel printing method using a transfer method which is excellent in sharpness and adhesion because the ink penetrates into the ink absorbing layer and is fused during the heating and pressing process of the transfer film.

According to an aspect of the present invention, there is provided a panel printing method using a transfer method, comprising: providing a panel including a printing unit for printing and a non-printing unit for printing; Forming a mask layer on the non-printed portion of the panel; Forming a first ink absorbing layer by spraying a first coating liquid on a printing portion of the panel and then drying at a temperature of 15 to 25 ° C for 5 to 20 minutes; Forming a third ink absorbing layer by spraying a third coating liquid onto the printing portion of the panel and then drying at a temperature of 70 to 90 캜 for 120 to 150 minutes; Laminating a transfer film on which the ink is printed on the third ink absorbing layer in a digital printing manner; Heating and pressing the transfer film to fuse the ink into the first and third ink absorbing layers to perform printing; Wherein the step of printing is performed in a chamber provided with a lower heater, an upper heater, and a jig, wherein the panel is mounted on the jig, and the jig is placed in a chamber directly below the jig The panel and the transfer film are heated from below and the upper heater disposed in the upper part of the chamber is heated to maintain the temperature in the chamber at 70 to 90 ° C And printing is performed.

Further, in the panel printing method using the transfer method according to the present invention, the panel is made of any one of glass, metal, and acrylic resin.

In the panel printing method using the transfer method according to the present invention, the first and third ink absorbing layers are formed by spraying a coating liquid containing a subject and a solvent in a spraying manner, The first coating liquid of the third ink absorbing layer has a composition ratio of urethane resin, a curing agent and a solvent of 3: 0.5 to 1.5: 2 to 3: 1, 3 < / RTI > by weight.

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Further, in the panel printing method using the transfer method according to the present invention, after the step of forming the first ink absorbing layer is formed, the second ink absorbing layer is formed by spraying the second coating liquid onto the first ink absorbing layer Further comprising the steps of:

Further, in the panel printing method using the transfer method according to the present invention, the second coating liquid is composed of the urethane resin, the curing agent and the solvent, which are the main components, in a weight ratio of 3: 0.5 to 1.5: 1 to 2, Is formed by spraying the second coating liquid onto the printing portion and then drying at a temperature of 70 to 90 ° C for 5 to 20 minutes.

In the panel printing method using the transfer method according to the present invention, the coating thicknesses of the first, second and third ink absorption layers are respectively 5 to 8 占 퐉 and the total thickness of the first, The ratio of the thickness of the ink printed on the transfer film is 1: 0.3-0.5.

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Further, in the panel printing method using the transfer method according to the present invention, the printing portion of the panel is made of a 3D solid structure having a curved surface, and the transfer film has an elongation of at least 40% so as to be pressed along the curved surface of the printing portion. And is made of a flexible material.

In the panel printing method using the transfer method according to the present invention having the above-described structure, an ink absorbing layer is formed on a panel such as a window glass, and then the ink is printed thereon with ink printed on a digital printer or the like, Can be easily printed.

In addition, the panel printing method using the transfer method according to the present invention is sharp and excellent in adhesion because the ink fuses while penetrating the ink absorbing layer during the heating and pressing process of the transfer film.

1 is a block diagram showing each step of a panel printing method using a transfer method according to the present invention.
2 is a perspective view showing a window glass of the present invention.
FIG. 3A is a cross-sectional view showing a state in which a mask layer is formed on the glass of the present invention, FIG. 3B is a cross-sectional view showing an ink absorbing layer formed on the glass of the present invention, Is laminated on the ink absorbing layer. FIGS. 3 (a) and 3 (e) are cross-sectional views showing a state in which the transfer film of the present invention is transferred, and FIG. 3 (f) is a cross-
FIG. 4A is a photograph of a state where an ink absorbing layer is formed on a window glass of the present invention, and FIG. 4B is a photograph of a glass on which an image is printed by the transferring method of Embodiment 1 of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings and the following description. However, the present invention is not limited to the embodiments described herein but may be embodied in other forms. Rather, the embodiments disclosed herein are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

In the description of the present invention, the same or similar elements are denoted by the same or similar reference numerals, and a detailed description thereof will be omitted.

The panel to which the printing method of the present invention is applied may be exemplified by a window glass of an IT device such as a smart phone or a tablet PC, a protective glass for protecting the window glass, a camera lens, a back cover, The material of which is made of glass, metal, acrylic resin or the like. In addition, various colors and designs can be produced by the thermal transfer method on the surface of the panel to be printed.

In the following description, the panel to be printed is a window glass for display.

1 to 3E, a panel printing method using a transfer method according to the present invention includes a step S1 of providing a window glass 100, a step S2 of forming a mask layer (not shown) on the non-printing portion 103 of the window glass 100, A step S3 of forming first, second, and third ink absorbing layers 131, 132, and 133 on the printing unit 101 of the window glass 100; A step S4 of laminating a transfer film 150 on the third ink absorbing layer 133 and a step of heating and pressing the transfer film 150 so that the ink 151 penetrates the ink absorbing layer 130 (131, 132, 133) A step S5 of fusing and printing may be performed, and a step S6 of removing the mask layer 110 may be included.

As shown in FIG. 2, the window glass 100 provided in the step S1 includes a printing unit 101 for printing various images including various logos, characters, patterns, and characters, a printing unit 101 for printing, And the non-printing unit 103 that does not print.

The mask layer 110 in the step S2 is to prevent the coating liquid or the ink 151 from adhering to the non-printing portion 103. It is preferable to use an oil-based masking ink so as to be easily removed, Printed on the non-printing portion 103 by a silkscreen printing method, and then dried at a temperature of 140 to 160 ° C.

In step S3, the first, second, and third ink absorbing layers 131, 132, and 133 may be sequentially formed. However, since the second ink absorbing layer 132 is provided to impart gloss performance, It may be omitted.

The first ink absorbing layer 131 may be formed by spraying a first coating solution for ink absorption onto the printing portion and then drying at a temperature of 15 to 25 ° C for 5 to 20 minutes. If the amount of the solvent is less than 1 part by weight relative to the acrylic resin, the viscosity of the first coating liquid is increased and a uniform coating film is difficult to form. If the ratio of the acrylic resin and the solvent exceeds 3 parts by weight It is too thin to form a desired coating film thickness.

The acrylic resin may be at least one selected from the group consisting of Methyl methacrylate (MMA), Ethyl acrylate monomer (EAM), n-Butyl Acrylate (BA), n-Butyl Methacrylate ), And acrylic acid (AA).

Examples of the solvent include ethyl alcohol, methyl isobutyl ketone, butyl alcohol, acetate, ketone, and ester.

The second ink absorbing layer 132 may be formed by spraying a second coating liquid for ink absorption onto the printing unit and then drying at a temperature of 70 to 90 ° C for 5 to 20 minutes. The second coating liquid can be exemplified by the weight ratio of urethane resin, curing agent and solvent being 3: 0.5 ~ 1.5: 1 ~ 2.

The third ink absorbing layer 133 may be formed by spraying a third coating liquid for ink absorption onto the second ink absorbing layer, followed by drying at a temperature of 70 to 90 ° C for 120 to 150 minutes . The third coating liquid may be a mixture of urethane resin, curing agent and solvent in a weight ratio of 3: 0.5 to 1.5: 2 to 3, and may be added with white, black, other color pigment or pearl .

Since the drying time of the first ink absorbing layer 131 and the second ink absorbing layer 132 is shortened by about 5 to 20 minutes and dried, the entire ink absorbing layer forming process can be processed quickly, During the drying process of the absorbing layer 133, complete curing is performed.

The thicknesses of the first, second, and third ink absorbing layers 131, 132, and 133 are 5 to 8 μm, respectively. The ratio of the total thickness of the first, second and third ink absorbing layers to the thickness of the ink printed on the transfer film is 1: 0.2 to 0.6, more preferably 0.3 to 0.5. For example, When the total thickness of the second and third ink absorbing layers 131, 132, and 133 is 15 占 퐉, the ink may have a thickness of 4 to 8 占 퐉. If the ratio of the thickness of each coating film is less than 1: 0.3, the thickness of the ink becomes thicker, and the amount of ink not penetrated into the ink absorbing layer becomes excessively large, The amount of the ink is relatively small and the sharpness of the color may be lowered.

On the other hand, when the printing unit 101 of the window glass 100 is formed of a curved surface, each ink absorbing layer may be formed using digital printing, 3D printing, or the like. In this case, the step of forming the mask layer may be omitted.

In step S4, a transfer printing method of heat pressing by heating and pressing the transfer film is performed.

3D, the window glass 100 is fixed to the jig Z having a structure capable of being elevated, and then the jig Z is lifted to transfer the transfer film 150 to the heating plate H, The thermal transfer can be performed. 3E, the window glass 100 is fixed on a jig provided in the chamber, and a vacuum pump is operated while the transfer film 150 is stacked and fixed on the window glass to transfer the transfer film 150 ) May be squeezed in such a manner as to be adsorbed to the window glass, and the thermal transfer may be performed while being heated by the upper heater and the lower heater (H1, H2). At this time, the temperature in the chamber is maintained at 70 to 90 DEG C, and the temperature of the lower heater H2 is 100 to 140 DEG C.

The ink 151 needs to use a water-soluble ink composed of a pigment, water, a solvent, a surface tension adjusting agent, and a viscosity adjuster so as to be fused with the ink absorbing layer 130 in the transfer process. That is, when the oil-based ink is used, the ink is not easily fused with the ink absorbing layer, but is separated from the ink absorbing layer 130 and the sharpness of color is lowered.

When the ink 151 is adhered to the transfer film 150, the ink 151 is in a solid state, and when it is heated and pressed, the ink 151 becomes a liquid phase that can flow as shown in FIG. 3E, .

In the case of transferring to a transfer film on which oil-based ink is directly printed on the glass surface without forming an ink absorbing layer, the adhesive force is weak, and therefore, a separate adhesive must be squeezed on the surface of the glass. In this case, when the sprayed adhesive is not evenly sprayed, the smoothness of the printed layer is lowered, the color of the printed layer is not clear by the adhesive, and the non-printed portion must be masked so that the adhesive is not applied to the non-printed portion.

However, when the water-soluble ink is fused with the ink absorbing layer as in the present invention, the adhesion of the ink and the sharpness of the color are greatly improved.

In step S5, the transfer film 150 is preferably vacuum-pressed at a temperature of 70 to 150 ° C for 2 to 10 minutes. When the temperature is lower than the above-mentioned range, The penetration and the fusion of the ink absorbing layer are not sufficiently achieved, and it is difficult to expect an increase in the effect even if the temperature and the time range are exceeded, which is inefficient.

And forming a hard coating layer (not shown) made of urethane resin or the like for protecting the printing surface when printing is completed.

In step S6, the mask layer 110 is removed in a state in which printing is completed on the window glass 100. Since the mask layer 110 is formed of the water-soluble marking ink as described above, it can be easily removed.

Hereinafter, a panel printing method using a transfer method according to the present invention will be described in detail with reference to a more preferred embodiment.

1. First, a mask layer is formed on the non-printing portion previously formed on one side of the window glass using a silk screen method using the oil-based masking ink.

2. Next, first, second and third ink absorbing layers each having a thickness of 5 mu m are sequentially formed on the printing portion on which the mask layer is not formed. Here, the first ink absorbing layer is made of an acrylic resin (Ethyl acrylate monomer (EAM)) and acrylic resin (acrylic acid, AA), and the second and third ink absorbing layers are made of urethane resin Respectively. The drying conditions of the first, second and third ink absorbing layers were 5 minutes at a temperature of 20 캜, 5 minutes at a temperature of 20 캜 and 130 minutes at a temperature of 80 캜. The first and second ink absorbing layers were transparent without adding pigments, and the third ink absorbing layer was formed with white pigments added thereto, and the window glass formed with the ink absorbing layer was shown in the photograph of FIG. 4A.

3. Next, a PET transfer film having excellent elongation is laminated on the ink absorbing layer. Here, water-soluble ink is printed on one side of the transfer film, and the thickness of the water-soluble ink is 15 占 퐉.

4. Next, the window glass is fixed to the jig provided in the chamber, the transfer film is laminated and fixed, and then the vacuum film is processed to fix the transfer film on the window glass. At this time, the temperature in the chamber is set at 80 占 폚, and the lower heating plate is set at 110 占 폚 to perform thermal transfer printing.

5. Next, the glass was washed to complete the printing process by the transfer method, and the printed glass photograph was shown in FIG. 4B.

The images printed on the window glass were clear in color and were not scratched or damaged when the edges of the image printed with the nails were scratched.

While the present invention has been described in connection with certain exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. Therefore, it is to be understood that the present invention is not limited to the above-described embodiments. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims. It is also to be understood that the invention includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.

100: Glass 101: Printing section
103: non-printing portion 110: mask layer
130: ink absorbing layer 150: transfer film
151: ink Z: jig
H1, H2: Upper and lower heater

Claims (10)

A step of providing a panel composed of a printing unit where printing is performed and a non-printing unit where printing is not performed;
Forming a mask layer on the non-printed portion of the panel;
Forming a first ink absorbing layer by spraying a first coating liquid on a printing portion of the panel and then drying at a temperature of 15 to 25 ° C for 5 to 20 minutes;
Forming a second ink absorbing layer by spraying a second coating liquid onto the first ink absorbing layer;
Forming a third ink absorbing layer by spraying a third coating liquid onto the second ink absorbing layer, and then drying the ink at a temperature of 70 to 90 DEG C for 120 to 150 minutes;
Laminating a transfer film on which the ink is printed on the third ink absorbing layer in a digital printing manner;
Heating and pressing the transfer film to fuse the ink into the first, second and third ink absorbing layers to perform printing;
And removing the mask layer,
Wherein the second coating liquid comprises a urethane resin, a curing agent and a solvent in a weight ratio of 3: 0.5 to 1.5: 1 to 2,
The second ink absorbing layer is formed by spraying the second coating liquid onto the first ink absorbing layer and then drying at a temperature of 70 to 90 ° C for 5 to 20 minutes,
Wherein the step of printing comprises:
A lower heater, an upper heater, and a jig,
The panel is mounted on the jig and the lower heater disposed directly below the jig is heated to 100 to 140 ° C to heat the panel and the transfer film from below and the upper heater Wherein the printing is performed in an atmosphere in which the temperature in the chamber is maintained at 70 to 90 캜, and the ink is printed while being infiltrated into the 1, 2, and 3 ink absorbing layers.
The method according to claim 1,
Wherein the panel is made of one of glass, metal, and acrylic resin.
The method according to claim 1,
Wherein the first and third ink absorbing layers are formed by spraying a coating liquid containing a subject and a solvent in a spraying manner,
Wherein the first coating liquid of the first ink absorption layer is composed of acrylic resin and solvent in a weight ratio of 1: 1 to 3,
Wherein the third coating liquid of the third ink absorbing layer comprises a urethane resin, a curing agent and a solvent in a weight ratio of 3: 0.5 ~ 1.5: 2 ~ 3.
delete delete delete The method according to claim 1,
The coating thicknesses of the first, second and third ink absorbing layers are respectively 5 to 8 탆,
Wherein the ratio of the total thickness of the first, second and third ink absorbing layers to the thickness of the ink printed on the transfer film is 1: 0.3-0.5.
delete The method according to claim 1,
Wherein the printing unit of the panel has a three-dimensional structure having a curved surface,
Wherein the transfer film is made of a flexible material having an elongation of at least 40% so that the transfer film can be pressed along the curved surface of the printing unit.
A panel according to claim 1, characterized in that printing is performed.

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