KR102313807B1 - Midia for nail sticker - Google Patents

Abstract

The present invention relates to a recording medium for nail stickers, and more particularly, to a recording medium in which an ink-receiving layer is formed on a substrate made of a polyurethane material, so that a nail sticker can be printed using a sublimation printer.
A recording medium for a nail sticker according to the present invention includes a release paper; An adhesive layer formed on the release paper; A transparent substrate made of a polyurethane material attached to the adhesive layer; a white layer formed between the adhesive layer and the substrate; and an ink receiving layer formed on the substrate.

Description

Recording medium for nail sticker {MIDIA FOR NAIL STICKER}

The present invention relates to a recording medium for nail stickers, and more particularly, to a recording medium in which an ink-receiving layer is formed on a substrate made of a polyurethane material, so that a nail sticker can be printed using a sublimation printer.

In general, nail art refers to the beautiful expression of nails or toenails, and it is a comprehensive concept that means that an artistic expression is applied to the nails from simply applying manicure. For example.

Recently, the domestic beauty and nail art industry is showing rapid growth, and the size of the nail art industry is estimated to be about 1 trillion won in the beauty market, which is estimated to be about 4 trillion won. expected to be seen

Also, among the decorative materials used in nail art, there is a “nail sticker” that can be used conveniently. These nail stickers have a design printed on one side and an adhesive applied on the other side. It is a product that has a cosmetic effect by attaching it.

1 illustrates a general nail sticker. Referring to this, the nail sticker includes a base layer 11, an adhesive layer 12 formed by being applied to the bottom of the base layer 11, and the adhesive layer ( 12), a release paper 13 detachably attached to the bottom surface and a decorative layer 14 formed by silk-screen printing on the upper surface of the above-described base layer 11 with a glitter mix in which epoxy and glitter are mixed. . Since the base layer must be attached to curved nails, etc., a material having elasticity and flexibility is used.

On the other hand, there is a thermal transfer printer in which heat is applied to a thermal transfer ribbon coated with dye among printers that form an image so that the dye on the thermal transfer ribbon is transferred to a recording medium and fixed.

The thermal transfer printer includes a sublimation thermal transfer method in which the dye is transferred while sublimating, and a fusion thermal transfer method in which the dye or pigment layer is melted by a thermal recording head and transferred according to the thermal transfer method of the dye. is divided into

The thermal transfer printer is an important means of a photo printer along with the inkjet printing method, and its use area is becoming common from the manufacturing of ID cards or the field of printing an image electrically expressed from a camera through a printer.

Such a thermal transfer printer, in particular, a sublimation printer is suitable for personal use or portable use due to its small size.

Therefore, it is not impossible for users to make nail stickers at home according to their personal preferences using a sublimation printer. However, in order to produce a nail sticker using a sublimation printer, it is necessary to develop a dedicated recording medium.

In sublimation printers, photo paper or sticker paper is mainly used as a recording medium. Photo paper includes an ink-receiving layer having good compatibility with sublimation dye on a substrate, and in the case of sticker paper, an adhesive layer is further included on the opposite side of the substrate. In this case, void PET or PP synthetic paper is used as the substrate, which greatly affects the printability depending on the substrate, so the material used is limited.

In addition, in the printing method of the sublimation printer, Y(yellow)→M(magenta)→C(cyan)→O(Overlay) is transferred or coated on the recording medium in order. If the recording medium is transported back and forth and the rigidity of the recording medium is not too high, a paper feeding error occurs at the initial or reciprocating time. In the case of photo paper or sticker paper, plastic film such as PET or PP with rigidity is basically used, so there is no feeding problem during printing.

However, void PET or PP synthetic paper has a problem in that it is difficult to apply as a recording medium for gel nail stickers that have to be attached to curved nails, etc.

Patent Publication 10-2007-0062825 Patent Publication 10-2016-0011658 Patent Publication 10-2017-0018649 Registered Patent 10-1413858

The present invention has been devised to solve the above-mentioned problems, and an object of the present invention is to provide a recording medium having an ink receiving layer formed on a polyurethane material substrate, so that a nail sticker can be printed using a sublimation printer. .

Another object of the present invention is to provide a recording medium that can be transferred flat without deforming an ink receiving layer formed on a substrate made of a flexible material such as polyurethane when transferring the recording medium in a sublimation printer.

In order to solve the above technical problems, a recording medium for a nail sticker according to the present invention includes a release paper; An adhesive layer formed on the release paper; A transparent substrate made of a polyurethane material attached to the adhesive layer; a white layer formed between the adhesive layer and the substrate; and an ink receiving layer formed on the substrate.

In addition, the white layer is preferably formed of a titanium oxide material as a pigment.

In addition, the thickness of the white layer is preferably 5 ㎛ or less.

In addition, the ink receiving layer preferably has a thickness of 15 μm or more.

In addition, the ink receiving layer is selected from the group consisting of polyester resin, polyacrylate resin, polyvinyl acetate resin, polycarbonate resin, polyurethane resin, polyamide resin, polyvinyl chloride resin and vinyl chloride-vinyl acetate copolymer. It is preferably formed of any one resin.

In addition, the ink-receiving layer may further include polyethylene wax or silicone oil to improve releasability during transfer.

In addition, the ink receiving layer preferably further contains a surfactant for dispersing the resin and polyethylene wax or silicone oil.

In addition, it is preferable that the thickness of the substrate is 50 μm or more.

In addition, it is preferable that the thickness of the ink-receiving layer/thickness of the substrate is greater than 0.15.

In addition, the thickness of the ink-receiving layer/thickness of the substrate is preferably within a range greater than 0.15, and as the thickness of the substrate increases, the thickness of the ink-receiving layer also increases.

In addition, it is preferable that an undercoat layer is formed between the substrate and the ink receiving layer to enhance solvent resistance when the ink receiving layer is coated.

In addition, the undercoat layer is preferably formed of any one of polyester, acrylic polymer, and polyurethane.

In addition, it is preferable that a back coating layer is further formed on the back surface of the release paper.

In addition, the back coating layer is preferably formed of a polyurethane or acrylic material.

In addition, the back coating layer preferably further includes a pigment.

In addition, the thickness of the back coating layer is preferably 2-3㎛.

According to the present invention, it is possible to provide a recording medium capable of printing nail stickers using a sublimation printer because an ink receiving layer is formed on a substrate made of polyurethane.

Since the transfer part to which the base material is not attached to the ink receiving layer is formed on both sides of the release paper, when the recording medium is transported in the sublimation printer, there is an effect that the flexible ink receiving layer can be transported flat without deformation.

1 shows a conventional nail sticker.
2 and 3 show an embodiment according to the present invention.
4 is a view showing the transfer state of the embodiment according to the present invention in the sublimation printer.
Figure 5 shows that the sticker for the nail and the sticker for the toenail are formed.

Hereinafter, embodiments according to the present invention will be described in detail with reference to the accompanying drawings.

2 is a cross-sectional view taken along line A-A of FIG. 3, and FIG. 3 is a perspective view of an embodiment according to the present invention. Referring to this, the embodiment 100 of the recording medium according to the present invention includes a release paper 110 , an adhesive layer 120 , a substrate 130 , and an ink receiving layer 140 .

The release paper is detachably attached to the adhesive layer, and when using the nail sticker, the user separates the release paper from the adhesive layer and attaches the base material to the nail or toenail using the adhesive force of the adhesive layer.

The release paper 110 is mainly made of a polyester material, and is formed to a thickness of 75 to 125 μm.

When the thickness of the release paper 110 is less than 75 μm, there is a problem that the feed roller is contaminated by the adhesive layer during printing, and when it exceeds 125 μm, the overall weight increases to reduce the burden on the feeding of the printer. In addition, there is a problem of cost increase.

The adhesive layer 120 is formed on the back surface of the substrate, and the substrate 130 separated from the release paper 110 is attached to the nail or toenail.

The base material 130 is a component corresponding to the parent body of the nail sticker, and is formed of a polyurethane material in this embodiment.

Since the base material 130 is formed of a polyurethane material, it has elasticity and flexibility, so that it can be attached to curved nails or toenails.

In particular, the substrate 130 of the polyurethane material is formed to have a thickness of 50 ~ 200㎛.

When the thickness of the substrate 130 is less than 50 μm, there is a problem such as inconvenient and easily stretched when handling by a user, and when it exceeds 200 μm, the step becomes too large, which puts a strain on the paper feeding of the printer, as well as the cost. There is a problem with rising

It is preferable to use a material for the ink receiving layer 140 that has good affinity with the dye transferred from the thermal transfer ribbon, diffuses well during the transfer process, and has good preservation for the dye after transfer.

Such materials include polyester resins, polyacrylate resins, polyvinyl acetate resins, polycarbonate resins, polyurethane resins, polyamide resins, polyvinyl chloride resins, vinyl chloride-vinyl acetate copolymers, and other highly polar resins. and resins having bonds.

In the ink receiving layer 140 , polyethylene wax, silicone oil, etc. may be added to improve releasability during transfer along with these resins, and a surfactant may also be used to disperse them.

Titanium dioxide, calcium carbonate, clay, zinc oxide, etc. may be added to improve the whiteness of the recording medium 100, and a fluorescent dye may be added to impart fluorescence. In addition, antioxidants or ultraviolet absorbers may be introduced to increase weather resistance.

The ink receiving layer 140 may be formed by coating a coating solution containing a resin, an additive, and, if necessary, an inorganic material, followed by drying.

The thickness of the ink receiving layer 140 is preferably 15 μm to 30 μm, and the “thickness of the ink receiving layer/thickness of the substrate” is preferably greater than 0.15.

In addition, the thickness of the ink-receiving layer/thickness of the substrate is preferably within a range greater than 0.15, and as the thickness of the substrate increases, the thickness of the ink-receiving layer also increases.

When the substrate 130 made of polyurethane is used, when the thickness of the ink receiving layer is less than 15 μm, it is impossible to satisfy the sublimation type printability.

The reason that void PET or PP synthetic paper is used as the substrate of the sublimation printer is because the substrate itself has rigidity and a certain amount of cushioning. Due to the characteristics of the sublimation type printer, the ribbon and the recording medium meet at one point during printing and pressure is applied between the head and the platen roller to closely adhere to each other. The transfer proceeds insufficiently, which causes a decrease in printability such as a drop in optical density (OD, optical density).

Conversely, if the substrate has too good elasticity and flexibility, such as polyurethane, it does not receive pressure properly, resulting in insufficient dye transfer and a problem in reciprocating feeding.

In order to solve this problem, the portion of the ink receiving layer that comes into contact with the ribbon should be treated thicker than the existing 5㎛ to compensate for the portion deteriorated by the polyurethane substrate. As a result of several experiments, it was found that the above problem could be solved with an ink receiving layer of 15 μm or more, which was also affected by the thickness of the polyurethane substrate. As mentioned before, the binders used in the ink receiving layer are mainly polymers with rigidity, so it could be supplemented only by adjusting the thickness.

As a solvent for the coating agent of the ink receiving layer 140, alcohol, glycol ether, ketone, toluene, dimethylformaldehyde, ethyl acetate, etc. may be used together in consideration of solubility and workability. In the present invention, ketone, toluene, dimethylformaldehyde and the like are preferable.

An undercoat layer 150 is further formed between the substrate 130 and the ink receiving layer 140 . This is to enhance solvent resistance when coating the ink receiving layer 140 .

In the prior art, the substrate is formed of PET or PP, and these substrates have some solvent resistance to solvents such as toluene or MEK (Methyl Ethyl Ketone) of the ink receiving layer, so they are hardly affected when coating the ink receiving layer.

However, in the case of polyurethane, which is the base material of the present invention, depending on the type, it is easily soluble in toluene or MEK, so when the ink receiving layer is coated, the base material is melted or swollen by the solvent of the ink receiving layer, causing the whole to cry. do. To prevent this, you can solve this problem by using solvent-resistant polyurethane or by placing an undercoat layer under the ink-receiving layer. The use of solvent-resistant polyurethane has advantages and disadvantages, such as limiting the selection of polyurethane and introducing an undercoat layer increases cost.

The undercoating layer 140 is coated with a coating solution containing a high-gloss resin, so that a recording medium having excellent gloss can be manufactured regardless of the material of the substrate 130 . The coating solution used for the undercoating layer 140 contains a UV blocker, an antioxidant, and the like to improve the vulnerability of the substrate to light, thereby increasing the light resistance of the recording medium.

In general, a brightener or dye may be added to the ink receiving layer 140 to increase the whiteness of the recording medium. These are factors that cause yellowing of the printed and non-printed parts in the long term.

By adding such a brightener or dye to the undercoating layer 140 instead of the ink receiving layer, the effect on the external environment can be reduced, thereby improving light resistance.

Resins that can be used for the undercoating layer 140 include polyol-based resins, polyurethane-based resins, acrylic resins, and vinyl resins, and usually a curing agent such as polyisocyanate or aziridine is used together. These can be used not only for polyurethane, but also for polyolefin-based films such as polypropylene and polyethylene, and polyethylene terephthalate films. Any coating method can be applied to the undercoat layer, for example, a bar or gravure coating method is generally used.

The thickness of the undercoating layer 140 is preferably 3 μm to 5 μm.

When the thickness of the undercoating layer 140 is less than 3 μm, there is a problem that sufficient solvent resistance cannot be seen, and when it exceeds 5 μm, the overall thickness increases and the cost increases.

In addition, when the substrate 130 made of the urethane material is transparent, it is preferable to form the white layer 160 between the adhesive layer 120 and the substrate 130 .

Of course, when the substrate 130 is opaque, for example, when the substrate 130 is white polyurethane, the white layer 160 is unnecessary.

The thickness of the white layer 160 is preferably 5 μm or less.

In addition, a back coating layer 170 is formed on the back surface of the release paper 110 . The back coating layer 170 is for separability and aesthetics during printing between recording media, and may be subjected to matte treatment, antistatic agent, release property, etc., and may additionally print a company logo.

The back coating layer 170 is formed of a polyurethane or acrylic material, and if necessary, a pigment such as silica may be added. It is preferable that thickness is 2 micrometers - 3 micrometers.

When the thickness of the back coating layer 170 is less than 2 μm, there is a problem in that separation between the recording media is not smooth.

Hereinafter, it will be described in detail through embodiments according to the present invention. However, the present invention is not limited by the following examples.

Examples and Comparative Examples

On the other side of the polyurethane (trade name: DSAL series, Korea 2&2 Chemical) substrate of various thicknesses on which a 50㎛ transparent polyethylene terephthalate (PET) protective film is laminated on one side, the adhesive layer composition of [Table 1] is baked After drying using an applicator, apply to a thickness of ~40㎛ to form an adhesive layer of the recording medium for nail stickers, and then peel off the 50㎛ protective film and ~105㎛ release PET with antistatic agent and matte back coating Release paper was laminated toward the adhesive layer. After drying the undercoating layer composition shown in [Table 2] on the one surface of the polyurethane base of the thus-prepared recording medium using a bar coater to become ~4㎛, the ink receiving layer shown in [Table 3] again thereon After drying the composition using a bar coater, the composition was applied to various thicknesses to complete the final nail sticker recording medium.

adhesive layer composition division compound Input amount (parts by weight) solute 2-ethylhexyl acrylate 46.5 acrylic acid 3.3 2,2-Azobisisobutylonitrile 0.2 menstruum ethyl acetate 50

Note) Solute compound: Japan Pure Chemicals

Undercoat layer composition division compound Input amount (parts by weight) solute Water-dispersible polyurethane (32%) ¹⁾ 30.9 aziridine crosslinking agent ²⁾ 0.1 Silicone additive (surfactant) ³⁾ One menstruum water 68

Note) 1) Water-dispersible polyurethane: Handok Industrial, HU-SM100

2) Arijirin crosslinking agent: BF Chemtech, CL-467

3) Silicone additive: BYK Korea, BYK-348

Ink Receptive Layer Composition division compound Input amount (parts by weight) solute Vinyl chloride-vinyl acetate copolymer ¹⁾ 19 Amino-modified silicone oil ²⁾ 0.02 Epoxy-modified silicone oil ³⁾ 0.02 Fluorine surfactant ⁴⁾ 0.06 menstruum methyl ethyl ketone 40 toluene 40

Note) 1) Vinyl chloride-vinyl acetate copolymer: Hanwha Chemical, CP-430

2) Amino-modified silicone oil: Shinwol Chemical of Japan, KF-393

3) Epoxy-modified silicone oil: Shinwol Chemical of Japan, X-22-343

4) Fluorine surfactant: US 3M, FC-4430

The following [Table 4] shows Examples and Comparative Examples according to the thickness of the polyurethane and the thickness of the ink receiving layer.

Recording medium for nail sticker (Unit: ㎛) floor division Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 polyurethane base 200 120 50 220 40 120 60 ink receiving layer 30 20 15 35 15 15 10

Experimental method: Evaluation of characteristics of recording media for nail stickers

The recording media for nail stickers prepared in Examples (1 to 3) and Comparative Examples (1 to 4) were printed using a thermal transfer photo printer (PC389P) manufactured by LG Electronics, Korea. At this time, wrinkles and unevenness of the image, paper feed quality (round trip), and optical density (OD) were evaluated, and the results are summarized in Table 5 below.

In Table 5 below, the optical density was measured with a SpectroEye measuring device manufactured by X-rite of the United States after printing magenta and black images of 1 cm X 1 cm.

In addition, the evaluation of wrinkles and unevenness of the printed image was performed by visually confirming whether or not there were wrinkles or unevenness in the image when printing the image, and comparing the sizes with each other. As a result, when there is no wrinkle or stain, "○", when the size is 0.3 cm or less, "Δ", and when the size is 0.3 cm or more, "x".

In addition, the evaluation of the paper feed quality is similarly, when printing images, printing in Y(yellow)→M(magenta)→C(cyan)→O(Overlay) order, stopping at the beginning or the middle, or stopping the film in the last order of O It was visually confirmed whether a paper feeding error such as this sticking occurred, and the degree was compared. As a result, “○” indicates that there is no paper feeding error, “△” indicates that a paper-feed error occurs in 1 out of 3 sheets or a problem occurs in the last O sequence, and “×” indicates that a paper-feeding error almost always occurs. indicated as

division Wrinkles/Stains paper feed quality magenta black note Example 1 ○ ○ 1.77 1.85 Chapter 3 Average Example 2 ○ ○ 1.78 1.83 Chapter 3 Average Example 3 ○ ○ 1.75 1.83 Chapter 3 Average Comparative Example 1 X X - - Print 1 sheet Y only Comparative Example 2 ○ ○ 1.76 1.84 Chapter 3 Average Comparative Example 3 ○ ○ 1.58 1.61 Chapter 3 Average Comparative Example 4 △ △ 1.36 1.42 Chapter 2 (Chapter 1 O Fail) Average

From the results of Table 5, in all cases, the 'wrinkle/stain' and 'paper quality' problems occurred only in Comparative Examples 1 and 4. In the case of Comparative Example 1, the total thickness of the recording medium was more than 400 μm, which was too thick even with a slight mechanical modification of the printer, so that feeding did not proceed properly. As a result, 1 out of 3 sheets had been printed with Y, but at that time, the ink-receiving layer/polyurethane substrate was pushed, and wrinkles and stains were observed. Although there is a cost aspect, it seems that it is not easy to fit a recording medium that is too thick mechanically. In Comparative Example 4, the value of 'thickness of the ink receiving layer/thickness of the substrate' was 0.17, which was larger than 0.15, but the thickness of the ink receiving layer was 10 μm and smaller than 15 μm.

As mentioned before, the introduction of polyurethane, which has good elasticity and flexibility, has a great effect on paper feed quality. It can be seen that if the ink receiving layer is thick (more than 15㎛), the disadvantages of polyurethane are compensated. In Comparative Example 4, the ink receiving layer was not thick enough, which caused problems in paper feed quality, and thus also caused wrinkle/stain problems.

In Comparative Example 3, the thickness of the polyurethane is also 50 μm or more and the thickness of the ink receiving layer is 15 μm or more, but the value of “thickness of the ink receiving layer/thickness of the substrate” is 0.125, which is less than 0.15.

The thickness of the ink receiving layer is 15㎛ or more, so there are no problems with ‘wrinkle/stain’ and ‘feeding quality’.

Although the magenta and black optical densities are higher than Comparative Example 4 in which the ink receiving layer is 10 μm, it can be seen that the magenta and black optical densities are decreased by about 10% compared to the Example. In the case of Comparative Example 2, there is no problem in wrinkles/stains, paper feed quality, and optical density during printing.

However, when removing the sticker part from the printed recording medium to attach it to the actual nail or toenail after printing, the polyurethane part is too thin to remove it from the release paper, and it tends to stretch easily. It is also uncomfortable to attach to the nail. This indicates that the polyurethane must have a thickness (50 μm or more) of more than a certain level considering that it is a sticker for nail art.

division Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 usability No problem No problem No problem - weeping No problem -

3 and 4 , in the recording medium 100 according to the present invention, the substrate 130 and the ink receiving layer 140 are removed from both ends of the release paper 110 to expose the surface of the release paper 110 . It can be seen that the transfer unit 111 is formed.

The release paper 110 is a component for feeding the protrusions 211 of the feed roller 210 into the hole at an accurate pitch.

That is, the substrate 130 has a smaller area than the release paper 110 . Accordingly, both sides of the release paper 110 are exposed to form the transfer unit 111 .

As described above, in the printing method of the sublimation printer, Y(yellow)→M(magenta)→C(cyan)→O(Overlay) is transferred or coated on the recording medium. During this process, the recording medium is transferred back and forth from the printer. It must be transported at least 4 times. Accordingly, the sublimation printer is provided with a pressure roller 220 on the upper part and a feed roller 210 on the lower part with the recording medium interposed therebetween.

The feed roller 210 has a plurality of protrusions 211 penetrating through the release paper 110 , and the pressure roller 220 has a step portion 222 in close contact with the transfer unit 111 .

Since there is no polyurethane base material 130 in the portion through which the protrusion 211 penetrates, the base 130 made of a flexible material is not distorted by the pressure through which the protrusion 211 penetrates. In particular, since the step portion 222 closely presses the transfer unit 111, it does not affect the substrate 130 located inside the stepped portion 222, so that the substrate 130 can be maintained flat. .

The width of the step portion 222 is preferably equal to or greater than the width of the transfer portion 111 .

Referring to FIG. 5 , in the embodiment according to the present invention, a cut line is formed on the upper portion of the release paper 110 , so that the nail sticker S1 and the toenail sticker S2 can be easily separated.

100: recording medium (embodiment)
110: release paper
120: adhesive layer
130: description
140: ink receiving layer
150: undercoat layer
160: white layer
170: back coating

Claims (16)

release paper;
an adhesive layer formed on the release paper;
a transparent substrate made of a polyurethane material attached to the adhesive layer;
a white layer formed between the adhesive layer and the substrate; and
Including; an ink receiving layer formed on the substrate;
The ink receiving layer has a thickness of 15 μm or more,
The thickness of the substrate is 50 μm or more,
The thickness ratio of the thickness of the ink receiving layer / the thickness of the substrate is a value greater than 0.15,
A recording medium for nail stickers in which the thickness of the entire layer satisfies 400 μm or less.
According to claim 1,
The white layer is a recording medium for nail stickers, characterized in that it is formed of a titanium oxide material as a pigment.
According to claim 1,
A recording medium for nail stickers, characterized in that the thickness of the white layer is 5 μm or less.
delete According to claim 1,
The ink receiving layer is any one selected from the group consisting of polyester resin, polyacrylate resin, polyvinyl acetate resin, polycarbonate resin, polyurethane resin, polyamide resin, polyvinyl chloride resin and vinyl chloride-vinyl acetate copolymer A recording medium for nail stickers, characterized in that it is formed of a single resin.
6. The method of claim 5,
The ink-receiving layer further comprises polyethylene wax or silicone oil to improve releasability during transfer.
7. The method of claim 6,
The ink receiving layer further comprises a surfactant for dispersing the resin and polyethylene wax or silicone oil.
delete delete delete According to claim 1,
A recording medium for nail stickers, characterized in that an undercoat layer is formed between the substrate and the ink receiving layer to enhance solvent resistance when the ink receiving layer is coated.
12. The method of claim 11,
The undercoating layer is a recording medium for nail stickers, characterized in that it is formed of any one of polyester, acrylic polymer, and polyurethane.
According to claim 1,
A recording medium for nail stickers, characterized in that a back coating layer is further formed on the back surface of the release paper.
14. The method of claim 13,
The back coating layer is a recording medium for nail stickers, characterized in that formed of a polyurethane or acrylic material.
15. The method of claim 14,
The back coating layer is a nail sticker recording medium, characterized in that it further comprises a pigment.
14. The method of claim 13,
The recording medium for nail stickers, characterized in that the thickness of the back coating layer is 2-3㎛.

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