20).

The attaching the film (S10) may include decreasing the adhesive force between the base sheet and the film by allowing the base sheet to absorb a solution (S11), attaching the base sheet and the film on the skin (S12), and separating the base sheet from the film (S13).

Referring to FIG. 4, in the decreasing the adhesive force between the base sheet and the film by allowing the base sheet to absorb a solution (S11), the adhesive force of the interlayer 15 of the skin attachment patch 1 may be decreased.

For the skin attachment patch 1, the additive material is absorbed by the interlayer 15, and the adhesive force of the interlayer 15 may be decreased. The additive material, which is a solution, may be absorbed by the interlayer 15 in various ways.

In an embodiment, when the skin attachment patch 1 is immersed in a solution DW stored in a container B as illustrated in FIG. 4, the solution DW is absorbed by the base sheet 10 and penetrates into the interlayer 15. The adhesive force of the interlayer 15 may be decreased by the solution DW.

As another example, by spraying the solution DW from the top or side of the base sheet 10, the solution DW may penetrate into the interlayer 15. The adhesive force of the interlayer 15 may be decreased by the solution DW.

Although the drawing shows that the liner sheet 20 is removed after the solution DW is absorbed by the skin attachment patch 1, embodiments of the present disclosure are not limited thereto. Before the liner sheet 20 is removed from the skin attachment patch 1 and the film 100 is attached to the skin S, the solution DW may be absorbed by the skin attachment patch 1.

Referring to FIG. 5, in the attaching the base sheet and the film on the skin (S12), the skin attachment patch 1 may be attached to the skin S, after the liner sheet 20 is removed. Due to the adhesive force of the second layer 120, the skin attachment patch 1 may be fixed on the skin S.

Referring to FIG. 6, in the separating the base sheet from the film (S13), the base sheet 10 may be removed. Since the adhesive force of the interlayer 15 is decreased due to the solution DW, the user may simply separate the base sheet 10 from the film 100.

In another embodiment, the attaching the film (S10) may include attaching the base sheet and the film on the skin (S12) and separating the base sheet from the film (S13). By forming the interlayer 15 having a smaller adhesive force than the second layer 120, the decreasing the adhesive force between the base sheet and the film by allowing the base sheet to absorb the solution (S11) may be omitted.

The interlayer 15 may have a lower adhesive force than the second layer 120 of the film 100. When the base sheet 10 is removed after the second layer 120 of the film 100 is attached on the skin, since the adhesive force between the second layer 120 and the skin may be less than the adhesive force between the base sheet 10 and the interlayer 15 or the adhesive force between the first layer 110 and the interlayer 15, the base sheet 10 may be easily removed.

Referring to FIG. 7, in the decreasing of the thickness of the film by the activating material (S20), the activating material AM may be applied or sprayed onto the film 100.

In an embodiment, the activating material AM may be sprayed to the first layer 110 of the film 100 by the spray SP as illustrated in FIG. 7. When the activating material AM reacts with the first layer 110, the thickness of the first layer 110 may be decreased and the softness thereof may be increased.

In an optional embodiment, in order to increase the reaction between the first layer 110 and the activating material AM, the user may press the film 100 using, for example, a puff on the first layer 110 on which the activating material AM is applied. Under pressure, the activating material AM may penetrate into the interior of the first layer 110.

Referring to FIG. 8, when the skin attachment patch 1 is attached on the skin S, a void VO may be formed between the film 100 and the skin S by an uneven surface of the skin S. The void VO formed between the film 100 and the skin S may reflect or distort visible light coming from the outside. Thus, when viewed from the outside, the film does not look transparent, and wrinkles may be easily formed.

Referring to FIG. 9, when the film 100 is activated by the activating material AM, the thickness of the first layer 110 may be decreased from the first thickness T1 to the first′ thickness T1′ so that the film 100 becomes softer and is more adhesive to the skin. That is, the first layer 110 may be attached to fit the uneven surface of the skin S, so that the void VO may be removed. In an embodiment, the thickness of the first layer 110 may be decreased and the transparency thereof may be increased.

FIGS. 12 and 13 are graphs illustrating the UV blocking effect of the patch for attachment on the skin illustrated in FIG. 1.

The skin attachment patch of FIGS. 12 and 13 includes a UV blocking material in a film, and may have UV blocking performance, water resistance (FIG. 12) and blocking retention (FIG. 13). In the graphs, the x-axis represents the wavelength, and the y-axis is defined as the blocking rate.

When the thickness of the skin attachment film was 25 nm, the UV protection factor (UPF) of the film was 343, the UV-B blocking ratio was 99.9% and the UV-A blocking ratio was 95.8%.

When the thickness of the skin attachment film was 35 nm, the UV protection factor (UPF) of the film was 343, the UV-B blocking ratio was 99.9% and the UV-A blocking ratio was 97.4%.

In the water resistance test, the skin attachment patch was fixed on a 96 well plate, and an experimental environment was provided such that both the inner and outer surfaces of the skin attachment film was immersed in water. Immersing (20 min) and drying (20 min) were repeatedly performed.

In the graph of FIG. 12, 160 min refers to a case where immersing and drying were performed 8 times, 320 min refers to a case where immersing and drying were performed 16 times, 480 min refers to a case where immersing and drying were performed 24 times, and 640 min refers to a case where immersing and drying were performed 32 times. Even when the patch for attachment on the skin was repeatedly immersed and dried, the UV protection efficiency was not decreased. In particular, it was confirmed that even if the patch for attachment on the skin was repeatedly immersed and dried, almost 100% blocking efficiency was maintained in the UV-B wavelength band, and the UV-A wavelength band of 390 nm or lower.