KR20240146738A - Length extension type nail sticker - Google Patents

Abstract

An extended nail sticker is disclosed. The extended nail sticker according to the present invention comprises a sticker body having an adhesive region adhered to a nail, and an extended region extending from the adhesive region and protruding outward from a free edge of the nail; and a semi-cured layer provided on an upper surface of the sticker body and hardened after the sticker body is adhered to the nail.

Description

{LENGTH EXTENSION TYPE NAIL STICKER}

The present invention relates to an extended nail sticker.

Generally, artificial nails are used to decorate fingernails and toenails, and nail stickers that assist with manicure are mainly used.

Artificial nails have the advantage of being more aesthetically pleasing than natural nails and being able to be shaped to extend from the natural nail, but they have the problem of causing a foreign body sensation to the wearer, hair getting caught between the natural nail and artificial nail, and contaminants seeping in.

On the other hand, nail stickers have the advantage of excellent fitting and preventing hair and contaminants from getting caught between the nail and the nail sticker, but they have the problem that they must maintain the original shape of the nail and cannot be extended from the nail.

In addition, considering that artificial nails require a high level of technology to make and use and are expensive and time-consuming, nail stickers printed on fabric with various patterns and colors are gaining popularity.

In this situation, there is a need for technology for nail stickers that can be extended from fingernails, etc., which is an advantage of artificial nails.

Republic of Korea Patent No. 10-1797203 (announced on November 15, 2017)

Therefore, the technical problem that the present invention seeks to solve is to provide an extendable nail sticker that has the advantages of a nail sticker and can extend outward from the free edge of a nail.

According to one aspect of the present invention, an extended nail sticker may be provided, comprising: a sticker body having an adhesive region adhered to a nail; an extended region extending from the adhesive region and protruding outward from a free edge of the nail; and a semi-cured layer provided on an upper surface of the sticker body and hardened after the sticker body is adhered to the nail.

The above semi-cured layer may have a three-dimensional dome shape whose thickness increases from the cuticle layer of the nail toward the free edge of the nail.

The thickness of the above sticker body is 250 to 400 ㎛, and the thickness of the semi-cured layer increases from the cuticle layer of the nail toward the free edge of the nail, so that the sum of the thickness of the end of the sticker body protruding outward from the free edge of the nail and the thickness of the end of the semi-cured layer may be 600 to 2,500 ㎛.

The ratio of the thickness of one end of the nail sticker positioned on the cuticle layer of the nail and the thickness of the other end of the nail sticker positioned at the end protruding outward from the free edge side of the nail may be 1.5 to 10.

The length of the above extended area may be less than 2.5 times the length of the above adhesive area.

The bending strength of the nail sticker in the hardened state of the above semi-cured layer can be 20 to 150 gf/mm ² .

The above sticker body may further include an adhesive layer that adheres to a nail; and a UV top gel or top coat applied to a lower surface of the adhesive layer located in the extended area, or a box sticker transferred to a lower surface of the adhesive layer located in the extended area.

An embodiment of the present invention comprises a sticker body having an extended area protruding outward from the free edge of a nail and a semi-cured layer provided on an upper surface of the sticker body, so that a nail sticker extending outward from the nail can be implemented by adhering the sticker body to the nail and then curing the semi-cured layer.

In addition, the embodiment of the present invention can prevent bending of an extended area protruding outwardly of a nail even when the nail sticker extends outwardly of the nail, prevent curling during hardening of a semi-cured layer, and prevent a curved pattern from being formed on the nail sticker corresponding to the free edge position of the nail.

Figure 1 is a plan view showing an extended nail sticker according to the present invention.
Figures 2a to 2d are cross-sectional views taken along line AA of Figure 1.
Figure 3 is a BB cross-sectional view of Figure 1.
Figure 4 is a photograph showing a state in which a curved pattern is formed on a nail sticker when the nail sticker is adhered to the nail and hardened.
Figures 5 and 6 are diagrams showing the usage status of an extended nail sticker according to the present invention.
Figure 7 is a perspective view showing an extended nail sticker according to the present invention adhered to a fingernail.
Fig. 8 is a cross-sectional view along the DD line of Fig. 7.
Fig. 9 is a cross-sectional view along the EE line of Fig. 7.
Fig. 10 is a drawing showing an extended nail sticker as viewed from the F direction of Fig. 7.
Figure 11 is a drawing showing a state in which a box sticker is transferred to an extended area of the sticker body while the extended nail sticker according to the present invention is adhered to a nail.

In order to fully understand the present invention, the operational advantages of the present invention, and the objects achieved by practicing the present invention, reference should be made to the accompanying drawings illustrating preferred embodiments of the present invention and the contents described in the accompanying drawings.

Hereinafter, the present invention will be described in detail by describing preferred embodiments of the present invention with reference to the attached drawings. The same reference numerals presented in each drawing represent the same components.

FIG. 1 is a perspective view showing an extended nail sticker according to the present invention, FIGS. 2a to 2d are cross-sectional views taken along line A-A of FIG. 1, FIG. 3 is a cross-sectional view taken along line B-B of FIG. 1, and FIG. 4 is a photograph showing a state in which a curved pattern is formed on a nail sticker when the nail sticker is adhered to a nail and hardened.

Referring to FIGS. 1 to 4, the extended nail sticker (100) according to the present invention has an excellent fit to the shape of the user's fingernail (M) and has an excellent aesthetic feel as it extends outside the free edge of the fingernail (M).

An extended nail sticker (100) includes a sticker body (110) that is adhered to a nail (M) and is positioned to protrude outward from the free edge of the nail (M), and a semi-cured layer (130) that is provided on the upper surface of the sticker body (110) and is positioned to protrude outward from the free edge of the nail (M). In addition, the extended nail sticker (100) may additionally include a protective film (150) that is provided on the upper surface of the semi-cured layer (130) in a peelable manner.

The sticker body (110) according to the present embodiment is adhered to the user's fingernail (M) or the like, which is a target surface. The sticker body (110) has an adhesive area (S1) adhered to the fingernail (M), and an extended area (S2) that extends from the adhesive area (S1) and protrudes outward from the free edge of the fingernail (M). In the present embodiment, the length of the extended area (S2) of the sticker body (110) is preferably within 2.5 times the average fingernail length. In other words, the length of the extended area (S2) of the sticker body (110) is preferably smaller than 2.5 times the length of the adhesive area (S1) of the sticker body (110).

For reference, the average thumb nail length is 12.83 mm, the average index nail length is 11.46 mm, the average middle nail length is 11.81 mm, the average ring nail length is 11.49 mm, and the average little nail length is 9.82 mm.

Referring to FIGS. 2A to 3, the sticker body (110) includes a release paper (not shown), an adhesive layer (111) that is releasably adhered to the upper surface of the release paper, an intermediate layer (115) provided on top of the adhesive layer (111), and a printing layer (113) provided between the adhesive layer (111) and the intermediate layer (115). Meanwhile, although not shown, the printing layer (113) may also be provided between the intermediate layer (115) and the semi-cured layer (130).

The release paper prevents the adhesive component of the adhesive layer (111) from sticking.

On the upper surface of the release paper, an adhesive layer (111), a printing layer (113), an intermediate layer (115), and a semi-cured layer (130) are sequentially laminated. Meanwhile, although not shown, an adhesive layer (111), an intermediate layer (115), a printing layer (113), and a semi-cured layer (130) may be sequentially laminated on the upper surface of the release paper. The adhesive layer (111), the printing layer (113), the intermediate layer (115), and the semi-cured layer (130) are peeled off from the release paper as a whole. By setting the surface tension of the release paper to 36 dyne/cm or less per unit width, the adhesive layer (111) is easily peeled off from the release paper, while preventing breakage and pop-up of the release paper.

The release paper can be manufactured by surface-coating a film or sheet made of one selected from among paper, polyvinyl chloride (PVC), polyethylene (PE), polyurethane (PU), polypropylene (PP), polyethylene phthalate (PET), polyolefin elastomer (POE), ethylene-vinyl acetate copolymer (EVA), and acrylic resins, or a polymer thereof, with silicone, Teflon, fluorine, or the like.

The adhesive layer (111) adheres to a target object, such as a fingernail (M).

The adhesive layer (111) may be formed of one or a blend of these, such as a PSA (Pressure Sensitive Adhesive), a vinyl monomer-based polymeric adhesive, a rubber-based adhesive, or a polyurethane-based two-component adhesive.

The adhesive strength of the adhesive layer (111) is preferably 300 to 25,000 gf/in. The adhesive strength can be measured by ASTM D3330 180 degree PEEL TEST. For example, when attaching the adhesive layer (111) to a nail (M), if the adhesive strength of the adhesive layer (111) is less than 300 gf/in, the adhesive layer (111) may be lifted from the nail (M) and may be easily separated from the nail (M), and if the adhesive strength of the adhesive layer (111) exceeds 25,000 gf/in, the nail (M) may be damaged when the user separates the adhesive layer (111) from the nail (M) for replacement. Therefore, the adhesive strength of the adhesive layer (111) is preferably 300 to 25,000 gf/in.

Referring to FIGS. 2A to 3, the adhesive layer (111) is illustrated as being provided under the printing layer (113), but is not limited thereto and the adhesive layer (111) may be provided under the intermediate layer (115).

In the case where the adhesive layer (111) is provided on the lower side of the printing layer (113), the adhesive layer (111) may be provided on the entire lower side of the printing layer (113), or may be provided on a part of the lower side of the printing layer (113) in consideration of the length of the nail (M), etc. Meanwhile, in the case where the adhesive layer (111) is provided on the lower side of the intermediate layer (115), the adhesive layer (111) may be provided on the entire lower side of the intermediate layer (115), or may be provided on a part of the lower side of the intermediate layer (115) in consideration of the length of the nail (M), etc.

In the case where the adhesive layer (111) is provided on the entire lower surface of the printing layer (113) or the intermediate layer (115), if the adhesive layer (111) is adhered to the nail (M), the adhesive layer (111) provided on the lower part of the sticker body (110) located in the extended area (S2) may be contaminated during use. Therefore, in order to prevent contamination of the adhesive layer (111) exposed to the outside, a UV top gel or top coat (Dry) may be applied to the exposed adhesive layer (111), or a box sticker (P) may be adhered to the exposed adhesive layer (111) and then transferred. When a UV top gel or top coat is applied, the nail sticker (100) is expected to become more durable and be usable for a long time, but since it is inconvenient for the user to perform an additional procedure, it is preferable to adhere the box sticker (P) to the exposed adhesive layer (111) considering the ease of use (see FIG. 11).

Meanwhile, even when the adhesive layer (111) is provided on a part of the lower surface of the printing layer (113) or the intermediate layer (115), a UV top gel or top coat (Dry) can be applied to the lower surface of the printing layer (113) or the intermediate layer (115) exposed to the outside of the nail (M) to prevent foreign substances from being caught between the sticker body (110) and the nail (M).

The printing layer (113) imparts color or design.

The printing layer (113) may be arranged to be laminated on the upper surface of the adhesive layer (111) (or the lower surface of the intermediate layer (115)). Meanwhile, although not shown, in the case where the intermediate layer (115) is laminated on the upper surface of the adhesive layer (111), the printing layer (113) may be arranged to be laminated on the upper surface of the intermediate layer (115).

The printing layer (113) may be printed in one color on the entire lower surface or upper surface of the intermediate layer (115), but is not limited thereto. The lower surface or upper surface of the intermediate layer (115) may be divided into multiple areas, and different colors or predetermined colors may be repeatedly printed in each area.

That is, the printing layer (113) can be formed on the lower surface of the intermediate layer (115) or the upper surface of the intermediate layer (115) by gravure printing, silk printing, flexographic printing, digital printing, laser printing, UV printing, master printing, rotary printing, sealing printing, offset printing, pad printing, screen printing, air brushing using an air gun, a spraying method, a flocking method, etc.

Additionally, the printing layer (113) may be a transparent or opaque film or sheet laminated on the lower surface of the intermediate layer (115) or the upper surface of the intermediate layer (115).

In addition, the printing layer (113) may be a transparent hologram film having various holographic patterns, designs, etc. formed on one side of the substrate film. The hologram film changes in various colors or designs depending on the viewing direction. In addition, the substrate film used in the transparent hologram film may be manufactured from a polymer resin that is identical or similar to the material of the intermediate layer (115) described above.

The middle layer (115) provides flexibility to the sticker body (110) and improves the strength of the sticker body (110).

The intermediate layer (115) may be arranged to be laminated on the upper surface of the printing layer (113). That is, the adhesive layer (111), the printing layer (113), and the intermediate layer (115) may be arranged to be laminated sequentially in the height direction. Meanwhile, although not shown, the intermediate layer (115) may be arranged to be laminated on the upper surface of the adhesive layer (111) (or the lower surface of the printing layer (113)). That is, the adhesive layer (111), the intermediate layer (115), and the printing layer (113) may be arranged to be laminated sequentially in the height direction.

The intermediate layer (115) may be any one selected from polyvinyl chloride (PVC), polyethylene (PE), polyurethane (PU), polypropylene (PP), polyethylene phthalate (PET), polyolefin elastomer (POE), ethylene-vinyl acetate copolymer (EVA), and acrylic resin, or may be a film or sheet made of a polymer thereof. However, the materials of the intermediate layer (115) listed above are only examples, and the scope of the present invention is not limited thereto. In addition, the intermediate layer (115) may additionally include a filler (not shown) such as glass fiber.

The semi-cured layer (130) according to the present embodiment may be provided to be laminated on the entire upper surface of the sticker body (110), specifically, on the entire upper surface of the intermediate layer (115). Meanwhile, although not shown, in the case where the adhesive layer (111), the intermediate layer (115), and the printing layer (113) are provided to be sequentially laminated in the height direction, the semi-cured layer (130) may be provided to be laminated on the entire upper surface of the printing layer (113).

The semi-cured layer (130) maintains a semi-solid state with a certain degree of flexibility, and after the sticker body (110) is adhered to the nail (M), it hardens and changes into a solid state.

When the semi-cured layer (130) is hardened after the sticker body (110) is adhered to the nail (M), the hardened semi-cured layer (130) can have a three-dimensional shape identical to or similar to that of an artificial nail. Thus, the thickness (T2) of the semi-cured layer (130) according to the present embodiment increases from one end of the sticker body (110) arranged on the cuticle layer of the nail (M) toward the other end of the sticker body (110) protruding outward from the free edge side of the nail (M), and the semi-cured layer (130) can have a three-dimensional dome shape. Accordingly, the extended nail sticker (100) according to the present invention can have excellent aesthetics like an artificial nail.

In this embodiment, the thickness (T1) of the sticker body (110) may be 250 to 400 μm. In addition, the thickness (T2) of the semi-cured layer (130) may increase from one end of the sticker body (110) disposed on the cuticle layer of the nail (M) toward the other end of the sticker body (110) protruding outward from the free edge side of the nail (M), so that the sum of the end thickness (T1) of the sticker body (110) protruding outward from the free edge side of the nail (M) and the end thickness (T2) of the semi-cured layer (130), i.e. the end thickness (T) of the nail sticker, may be 600 to 2,500 μm. The semi-cured layer (130) is formed by applying a liquid semi-cured layer (130) to the upper surface of the intermediate layer (115) and then thermally curing the liquid semi-cured layer (130). Therefore, the upper surface of the semi-cured layer (130) is formed to correspond to the smooth upper surface curve of the liquid semi-cured layer (130).

In addition, as shown in FIGS. 2a and 2b, the upper end surface of the semi-cured layer (130) may be formed to be rounded, or as shown in FIGS. 2c and 2d, the upper end surface of the semi-cured layer (130) may be formed to be bent.

The semi-cured layer (130) includes a thermosetting component and a photo-curable component, and the semi-cured layer (130) can be further photo-cured after thermosetting. In addition, the semi-cured layer (130) may additionally include a filler such as glass fiber.

The semi-cured layer (130) may exist in a form in which a thermosetting component and a photocurable component are dispersed. The semi-cured layer (130) may be heat-cured by applying heat to a mixture of a thermosetting component and a photocurable component to maintain flexibility, and may be hardened by additional photocuring.

In this embodiment, the term “thermosetting” includes not only the conventional sense of thermosetting triggered by thermal crosslinking through heat treatment, but also the concept of partial solidification caused by drying of a solvent included in a polymer or a mixture thereof.

In addition, in this embodiment, the semi-cured layer (130) can maintain a certain degree of flexibility even after thermal curing or partial solidification by thermal crosslinking, since uncured photocurable components remain.

The thermosetting component may include any one selected from polyvinyl chloride, polyethylene, polyurethane, polypropylene, polyethylene terephthalate, polyolefin elastomer, ethylene-vinylacetate copolymer, acrylic resin, polystyrene, polyvinylidene chloride, thermoplastic polyurethane (TPU), polyester, epoxy resin, acrylic resin, cellulose, polyol, and combinations thereof, and may optionally further include a curing agent.

Polyol can be used without limitation as a common polyol used in the synthesis of polyurethane resin. The content of polyol is not particularly limited and can be determined by considering flexibility, hardness, and wear resistance. And the curing agent is not particularly limited as long as it can form the thermosetting component.

The photocurable component comprises at least one of a photopolymerizable monomer, oligomer and combinations thereof and a photoinitiator.

For example, the photocurable component may include a polyfunctional epoxy (meth)acrylate monomer having at least one epoxy group in the molecule and being difunctional or more, a polyfunctional silicone (meth)acrylate oligomer having at least one silicone in the molecule and being pentafunctional or more, and a photoinitiator.

The above photopolymerizable monomer or oligomer may be, for example, any one of epoxy (meth)acrylate, polyurethane (meth)acrylate, polyester (meth)acrylate, etc.

The photoinitiator is one in which a reaction is initiated by the action of light, and examples of initiators that can be used include ethylphenyl phosphinate, trimethylbenoylbenoyl phosphinoxide, alpha amino ketone, alpha hydroxy ketone, acyl phosphine oxide, benzyldimethyl ketal, benzophenone, cationic (BASF), metallocene, and phenylglyoxylate series initiators, and the scope of the present invention is not limited thereto.

The above-described semi-cured layer (130) is formed by preparing a composition including a thermosetting component and a photo-curable component, applying a liquid semi-cured layer (130) to the upper surface of the intermediate layer (115), and then thermally curing the liquid semi-cured layer (130). By applying and thermally curing the liquid semi-cured layer (130) in this way, a semi-cured layer (130) having a shape corresponding to the shape of the upper surface of the intermediate layer (115) can be easily prepared.

The semi-cured layer (130) can maintain a certain degree of flexibility because the photo-curable component remains. The semi-cured layer (130) formed by thermal curing exists in a form in which the photo-curable component is dispersed, and the photo-curable component can further undergo a photopolymerization reaction by irradiating it with a predetermined UV light. That is, after the user adheres the adhesive layer (111) of the sticker body (110) to the nail (M), the semi-cured layer (130) can be hardened by photo-curing.

As shown in FIGS. 2A and 2C, a protective film (150) according to the present embodiment may be additionally provided on the upper surface of the semi-cured layer (130) to protect the semi-cured layer. The user removes the protective film (150) before adhering the adhesive layer (111) to the nail (M).

The protective film (150) may be manufactured by surface-coating a film or sheet made of one selected from among paper, polyvinyl chloride (PVC), polyethylene (PE), polyurethane (PU), polypropylene (PP), polyethylene terephthalate (PET), polyolefin elastomer (POE), ethylene-vinyl acetate copolymer (EVA), and acrylic resins, or a polymer thereof, with silicone, fluorine, etc.

As described above, the extended nail sticker (100) according to the present invention is adhered to the nail (M) and protrudes outward from the free edge of the nail (M). The extended area (S2) of the sticker body (110) corresponds to the extended area (S2) of the nail sticker (100), and the adhesive area (S1) of the sticker body (110) corresponds to the adhesive area (S1) of the nail sticker (100). The length of the extended area (S2) of the extended nail sticker (100), that is, the length protruding outward from the free edge of the nail (M), corresponds to the length of the extended area (S2) of the sticker body (110).

At this time, it is preferable that the length of the extension area (S2) of the nail sticker (100) protruding outward from the free edge of the nail (M) is within 2.5 times the average nail length. That is, the length of the extension area (S2) of the nail sticker (100) corresponding to the extension area (S2) of the sticker body (110) is preferably smaller than 2.5 times the length of the adhesive area (S1) of the nail sticker (100) corresponding to the adhesive area (S1) of the sticker body (110). If the length of the extension area (S2) of the nail sticker (100) is 2.5 times or more the length of the adhesive area (S1) of the nail sticker (100), the nail sticker may be vulnerable to bending or breaking during use.

And when the nail sticker (100) is pressed and attached to the nail (M), a curved pattern (C) may be created on the nail sticker (100) corresponding to the free edge position of the nail (M) due to the pressure applied to the nail sticker (100) (see FIG. 4).

Accordingly, in order to prevent the formation of a curved pattern (C) in the extended nail sticker (100) according to the present embodiment, the thickness (T1) of the sticker body (110) can be formed to be 250 to 400 μm. When the thickness (T1) of the sticker body (110) is less than 250 μm, a curved pattern (C) may be formed in the nail sticker (100) corresponding to the free edge position of the nail (M), and when the thickness (T1) of the sticker body (110) exceeds 400 μm, the formation of a curved pattern (C) in the nail sticker (100) corresponding to the free edge position of the nail (M) can be prevented, but foreign substances may frequently be introduced between the nail (M) and the sticker body (110) in the cuticle layer region of the nail (M), or hair may become entangled therein. Therefore, the thickness (T1) of the sticker body (110) is preferably 250 to 400 μm.

Meanwhile, when the sticker body (110) is adhered to the nail (M) and the semi-cured layer (130) is hardened, a curl may occur in which the end of the nail sticker (100) protruding outward from the free edge side of the nail (M) is lifted upward.

Accordingly, in order to prevent curling at the end of the nail sticker (100), after attaching the nail sticker (100) to the nail (M), the semi-cured layer (130) is irradiated with UV for 5 to 10 seconds to harden it, and then the nail sticker (100) is trimmed by hand and the semi-cured layer (130) is irradiated with UV again, and this action is repeated, or after attaching the nail sticker (100) to the nail (M), a guide member (not shown) in the shape of a nail (M) is pressed against the upper surface of the semi-cured layer (130), and then UV is irradiated to harden the semi-cured layer (130). In particular, when a guide member is used, the formation of an undesirable shape can be prevented and a natural nail shape can be achieved.

In addition, in this embodiment, in order to omit the repetitive motion of irradiating UV and trimming the nail sticker (100) by hand as described above and the additional provision of a guide member, the thickness (T2) of the semi-cured layer (130) is increased from one end of the sticker body (110) arranged on the cuticle layer of the nail (M) toward the other end of the sticker body (110) protruding outward from the free edge side of the nail (M). That is, since the thickness (T2) of the semi-cured layer (130) increases toward the end of the nail sticker, curling can be prevented by the weight of the semi-cured layer (130), and thus, a natural nail shape can be formed.

At this time, the ratio of the thickness of one end of the nail sticker (100) located on the cuticle layer of the nail (M) and the thickness of the other end of the nail sticker located at the end protruding outward from the free edge side of the nail (M) may be 1.5 to 10, and preferably may be 2.0 to 3.5 to have a natural nail shape.

Meanwhile, the extended nail sticker (100) according to the present invention may have a bending strength of 20 to 150 gf/mm 2 in the extended area (S2) of the nail sticker (100) when the nail sticker (100) is adhered to the nail (M) so that the extended area (S2) protruding from the free edge of the nail ( ^M ) is not bent or folded during use. In this embodiment, the bending strength is measured using a CT3 texture analyzer (universal material property analyzer) with a load cell of 50 kg at a test speed of 0.5 mm/s.

That is, when the semi-cured layer (130) is hardened, the extension area (S2) of the nail sticker (100) can have a bending strength of 20 to 150 gf/mm ² .

When the bending strength of the extended area (S2) of the nail sticker (100) is less than 20 gf/ ^mm2 while adhered to the nail (M) and the semi-cured layer (130) is hardened, the phenomenon of the extended area (S2) of the nail sticker (100) protruding from the free edge of the nail (M) being bent or bent by an external force during use (bending phenomenon) may frequently occur. And when the bending strength of the extended area (S2) of the nail sticker (100) exceeds 150 gf/ ^mm2 when adhered to the nail (M) and the semi-cured layer (130) is hardened, the extended area (S2) of the nail sticker (100) protruding from the free edge of the nail (M) is likely to be broken or fractured by an external force during use, and the nail sticker (100) may be lifted off the nail (M), which may frequently cause foreign substances to be introduced between the nail and the nail (M) or hair to become caught. Therefore, it is preferable that the bending strength of the extended area (S2) of the nail sticker (100) when adhered to the nail (M) and the semi-cured layer (130) is hardened be 20 to 150 gf/ ^mm2 .

As described above, the extended nail sticker (100) according to the present invention has a bending strength of the extended area (S2) of the nail sticker (100) of 20 to 150 gf/mm ² when the semi-cured layer (130) is cured. In addition, as described above, in order to provide a three-dimensional effect like an artificial fingernail (M), the extended nail sticker (100) according to the present invention has a thickness (T1) of the sticker body (110) of 250 to 400 ㎛, and the sum of the end thickness (T1) of the sticker body (110) protruding outward from the free edge side of the fingernail (M) and the end thickness (T2) of the semi-cured layer (130), i.e., the end thickness (T) of the nail sticker (100), has a thickness of 600 to 2,500 ㎛. When the end thickness (T) of the nail sticker (100) is less than 600 ㎛, it may be difficult to obtain the required bending strength of the extended area (S2) of the nail sticker (100), and also, while the sticker body (110) is adhered to the nail (M) and the semi-cured layer (130) is hardened, a curl may occur at the end of the nail sticker (100) protruding outward from the free edge side of the nail (M). In addition, when the end thickness (T) of the nail sticker (100) exceeds 2,500 ㎛, particularly, the extended area (S2) of the nail sticker (100) protruding from the free edge of the nail (M) may be easily broken or fractured by an external force during use. It is preferable that the end thickness (T) of the nail sticker (100) is 600 to 2,500 ㎛.

The operation of attaching the extended nail sticker (100) according to the present invention configured as described above to a nail (M) is described as follows.

FIG. 5 and FIG. 6 are diagrams showing the state of use of an extended nail sticker according to the present invention, FIG. 7 is a perspective view showing a state in which an extended nail sticker according to the present invention is adhered to a nail, FIG. 8 is a cross-sectional view taken along line D-D of FIG. 7, FIG. 9 is a cross-sectional view taken along line E-E of FIG. 7, FIG. 10 is a diagram showing an extended nail sticker as seen from the direction F of FIG. 7, and FIG. 11 is a diagram showing a state in which a box sticker is transferred to an extended area of a sticker body in a state in which an extended nail sticker according to the present invention is adhered to a nail.

Referring to FIG. 5, first, the release paper is peeled off from the sticker body (110). Then, with the release paper peeled off, the adhesive layer (111) of the sticker body (110) having an extended area (S2) protruding outward from the free edge of the nail (M) is adhered to the nail (M). In addition, as shown in FIGS. 2A and 2B, when a protective film (150) is provided on the upper surface of the semi-cured layer (130), the protective film (150) can be peeled off from the semi-cured layer (130) before the adhesive layer (111) of the sticker body (110) is adhered to the nail (M).

Then, the upper surface of the semi-cured layer (130) is pressed to adhere the adhesive layer (111) to the nail (M). At this time, the upper surface of the semi-cured layer (130) is pressed with a predetermined force so that the adhesive area (S1) of the flexible sticker body (110) does not lift off from the upper surface of the nail (M).

And referring to Fig. 6, the sticker body (110) and the semi-cured layer (130) are adhered to the nail (M) and laminated, and UV light is irradiated to harden the semi-cured layer (130).

And referring to Fig. 7, when the semi-cured layer (130) is cured, only the sticker body (110) and the cured semi-cured layer (130) remain adhered to the upper surface of the nail (M).

FIG. 8 shows a longitudinal cross-section of a nail sticker (100) while the nail sticker (100) is adhered to a nail (M), FIG. 9 shows a widthwise cross-section of a nail sticker (100) while the nail sticker (100) is adhered to a nail (M), and FIG. 10 shows a front view of a nail sticker (100) while the nail sticker (100) is adhered to a nail (M).

Meanwhile, since the adhesive layer (111) may be exposed to the outside when the nail sticker (100) is adhered to the nail (M), a box sticker (P) may be adhered to the adhesive layer to prevent the adhesive layer (111) from being contaminated, as shown in FIG. 11.

As described above, a sticker body (110) having an extended area (S2) protruding outward from the free edge of the nail (M) is adhered to the nail (M), and then a semi-cured layer (130) provided on the upper surface of the sticker body (110) is hardened to implement a nail sticker (100) extending outward from the nail (M).

In addition, a semi-cured layer (130) having a three-dimensional dome shape can be hardened to laminate a three-dimensional nail sticker (100) on a nail (M), thereby realizing an aesthetic feel similar to an artificial nail.

In addition, since the sticker body (110) is flexible, it does not come off the nail (M) and provides an excellent fit that conforms to the shape of the nail (M).

As such, the present invention is not limited to the described embodiments, and it is obvious to those skilled in the art that various modifications and variations can be made without departing from the spirit and scope of the present invention. Accordingly, such modified or modified examples should fall within the scope of the claims of the present invention.

100: Nail sticker 110: Sticker body
111: Adhesive layer 113: Print layer
115: Middle layer 130: Semi-cured layer
150: Protective film

Claims (7)

A sticker body having an adhesive area that adheres to a nail and an extension area that extends from the adhesive area and protrudes outward from the free edge of the nail; and
An extended nail sticker comprising a semi-cured layer provided on the upper surface of the sticker body and hardened after the sticker body is adhered to the nail. In the first paragraph,
The above semi-cured layer is,
An extension nail sticker with a three-dimensional dome shape whose thickness increases from the cuticle layer of the nail toward the free edge of the nail. In the first paragraph,
The thickness of the above sticker body is 250~400㎛.
An extended nail sticker in which the thickness of the semi-cured layer increases from the cuticle layer of the nail toward the free edge of the nail, and the sum of the thickness of the end of the sticker body protruding outward from the free edge of the nail and the thickness of the end of the semi-cured layer is 600 to 2,500 μm. In the first paragraph,
An extended nail sticker in which the ratio of the thickness of one end of the nail sticker positioned on the cuticle layer of the nail and the thickness of the other end of the nail sticker positioned at the end protruding outward from the free edge of the nail is 1.5 to 10. In the first paragraph,
An extended nail sticker wherein the length of the extended area is less than 2.5 times the length of the adhesive area. In the first paragraph,
^An extended nail sticker having a bending strength of 20 to 150 gf/mm2 when the semi-cured layer is hardened. In the first paragraph,
The above sticker body is,
an adhesive layer that adheres to the nail; and
An extended nail sticker further comprising a UV top gel or top coat applied to the lower surface of the adhesive layer positioned in the extended area, or a box sticker transferred to the lower surface of the adhesive layer positioned in the extended area.

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