Skin-patterned sheet and method for manufacturing a skin-patterned sheet

Abstract

To provide a skin design sheet that conceals discolored skin areas and blends smoothly with the skin, ensuring that edges are less noticeable, and to provide a production method of the same.SOLUTION: A skin design sheet includes an elastic sheet 13, a concealment layer 21 provided on the elastic sheet 13, and a skin image G formed on the concealment layer 21. The concealment layer 21 includes a solid concealment layer 21a, and dot concealment layers 21b disposed so as to surround the solid concealment layer 21a. A marginal zone of the skin image G comprises a gradient image G2 that fades into a lighter color as the marginal zone extends outward. The gradient image G2 is positioned on the dot concealment layers 21b.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to a skin design sheet and a method for manufacturing the skin design sheet.

Background Art

[0002] In order to make discolored parts of the skin such as stains and scars less noticeable, a skin design sheet to be attached to the discolored part is known. The skin design sheet is a sheet in which a predetermined color is previously colored on a base material by screen printing or the like, and the user selects and uses one that matches the color of their natural skin.

[0003] However, when a conventional skin design sheet is attached to the natural skin, the edge part (the boundary part with the natural skin) may be conspicuous and cause a sense of discomfort.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] An object of the present disclosure is to provide a skin design sheet that conceals discolored parts, conforms to human skin, and has an inconspicuous edge part, and a method for manufacturing the same.

Means for Solving the Problems

[0006] The skin design sheet of the present disclosure is a skin design sheet including a stretchable sheet, a concealment layer provided on the stretchable sheet, and a skin image formed on the concealment layer, wherein the concealment layer has a solid concealment layer and a halftone concealment layer disposed so as to surround the solid concealment layer, and a peripheral portion of the skin image is a gradation image having a lighter color toward the outside, and the gradation image is located on the halftone concealment layer.

[0007] The present disclosure's method for manufacturing a skin-patterned sheet comprises the steps of: heating a heat transfer sheet provided with a concealing layer; solidly transferring the concealing layer onto a stretchable sheet in a predetermined shape; transferring the concealing layer in a halftone pattern so as to surround the solidly transferred concealing layer; and forming a skin image on the transferred concealing layer, wherein the peripheral portion of the skin image is a gradient image with lighter colors towards the outside. [Effects of the Invention]

[0008] According to this disclosure, it is possible to conceal discolored areas, make the material blend in with human skin, and make the edges of the skin-like design sheet less noticeable. [Brief explanation of the drawing]

[0009] [Figure 1] This is a cross-sectional view of a laminated sheet used in the manufacture of a textured sheet according to the embodiment of this disclosure. [Figure 2] This is a plan view of a heat transfer sheet. [Figure 3] Figure 3A is a cross-sectional view of the laminated sheet, and Figure 3B is a plan view of the laminated sheet. [Figure 4] Figure 4A is a cross-sectional view of the laminated sheet, and Figure 4B is a plan view of the laminated sheet. [Figure 5] This figure shows an example of a skin image. [Figure 6] This is a cross-section of the skin-patterned sheet. [Figure 7] Figure 7A is a plan view of the concealment layer, and Figure 7B is a view of the skin image. [Figure 8] This is a plan view of the concealed layer. [Modes for carrying out the invention]

[0010] Figure 1 is a cross-sectional view of a laminated sheet 10 used in the manufacture of a textured sheet according to the embodiment of this disclosure. The laminated sheet 10 has a release sheet 11, an adhesive layer 12, and an elastic sheet 13 that are laminated in order. The laminated sheet 10 is, for example, in the shape of a long strip.

[0011] Figure 2 is a plan view of a heat transfer sheet 20 used in the manufacture of a textured sheet. The heat transfer sheet 20 is in the shape of a long strip, and a concealing layer 21, a transfer type receiving layer 22, a dye layer 23, and a protective layer 24 are formed sequentially on one side of a base sheet (not shown). The concealing layer 21 is, for example, a white layer. The dye layer 23 has, for example, a yellow dye layer, a magenta dye layer, and a cyan dye layer formed sequentially on the surface.

[0012] The laminated sheet 10 and the thermal transfer sheet 20 are set in a known thermal transfer printer, and the laminated sheet 10 and the thermal transfer sheet 20 are sandwiched between the thermal head and the platen roll, and the thermal head heats the thermal transfer sheet 20 from the back side (substrate sheet side).

[0013] The thermal head heats the concealing layer 21 based on the data of the skin-pattern sheet and transfers the concealing layer 21 onto the stretchable sheet 13 of the laminated sheet 10, as shown in Figures 3A and 3B. The concealing layer 21 is transferred to match the shape to be used as the skin-pattern sheet, for example, so that the overall shape is circular in plan view.

[0014] The opacity layer 21 is transferred so that the center is a solid opacity layer 21a and the periphery is a halftone opacity layer 21b. The diameter of each halftone dot is preferably between 0.1 mm and 1 mm. The solid opacity layer 21a is formed in a circular shape in plan view, and the halftone opacity layer 21b is arranged in a ring shape surrounding the solid opacity layer 21a. As shown in Figure 8, it is preferable to create a gradient in the halftone opacity layer 21b by gradually decreasing the halftone dot area ratio from 100% to 0% towards the outside. The halftone dot area ratio may be adjusted by the size of the halftone dot's plan view area, or it may be adjusted by fixing the plan view area and adjusting the number of halftone dots. The shape of the halftone dot may be a circle, or a polygon such as a square, rectangle, or pentagon.

[0015] Next, the thermal head heats the receiving layer 22 based on the data of the skin design sheet, and transfers the receiving layer 22 onto the concealing layer 21 as shown in FIGS. 4A and 4B. The receiving layer 22 is transferred in accordance with the shape used as the skin design sheet. For example, it is transferred into a circular shape in plan view. The receiving layer 22 is transferred solid so as to cover the concealing layer 21, and is also transferred solid onto the dot concealing layer 21b. The receiving layer 22 is a layer that is transparent enough to see the concealing layer 21 when viewed from the receiving layer 22 side after being transferred onto the concealing layer 21 (solid concealing layer 21a and dot concealing layer 21b).

[0016] When the receiving layer 22 is transferred onto the concealing layer 21, a part of the receiving layer 22 may enter between the dots of the dot concealing layer 21b and fill the space between the dots. The receiving layer 22 may be transferred in a size larger (in the planar direction) than the concealing layer 21. In this case, the receiving layer 22 located outside the dot concealing layer 21b is transferred onto the stretchable sheet 13. Since the concealing layer 21 has a small thickness, in the skin image forming process described later, it is also possible to transfer the dye from the thermal transfer sheet 20 to the receiving layer 22 located outside the dot concealing layer and transferred onto the stretchable sheet 13.

[0017] Next, the thermal head 31 heats the dye layer 23 based on the data of the skin design sheet, transfers the dye to the receiving layer 22 on the laminated sheet 10, and forms a skin image. As shown in FIG. 5, the skin image has a single-color image G1 at the center and a gradation image G2 whose color gradually fades toward the outer periphery at the peripheral part. Here, the color fading means that the total light transmittance increases. The total light transmittance is measured in accordance with JIS K7361-1:1997. Also, the single color is not a gradation.

[0018] The image G1 in the center part has a skin color that matches the skin of the user who uses the skin design sheet. By adjusting the transfer density ratios of yellow dye, magenta dye, and cyan dye, skin colors with different hues can be expressed. For example, there are multiple types of skin colors with different hues as shown in Table 1. The transfer density ratios of yellow dye, magenta dye, and cyan dye corresponding to each hue are measured in advance and registered in the memory of the thermal transfer printer.

[0019]

Table 1

[0020] Subsequently, the protective layer ........

[0021] The image receiving sheet 10 on which the concealment layer transfer, the receiving layer transfer, the skin image formation, and the protective layer transfer have been performed is cut into the product shape, and the skin design sheet is produced. The user peels off the release sheet 11 of the produced skin design sheet to expose the adhesive layer 12, and attaches the skin design sheet to the skin so that the central part of the skin design sheet covers the discolored part of the skin.

[0022] In the skin design sheet according to this embodiment, the central part of the concealment layer 21 is a solid concealment layer, and the peripheral part thereof is a halftone concealment layer. Also, the skin image formed on the receiving layer 22 has a skin color image in the central part that matches the skin, and a gradation image in the peripheral part.

[0023] Since the solid concealment layer and the receiving layer on which the skin color image is formed are laminated at the central part of the skin design sheet, the discolored part of the skin can be concealed. Since the peripheral part (outer peripheral part) of the skin design sheet is laminated with the halftone concealment layer and the receiving layer on which the gradation image is formed, the edge of the skin design sheet (the boundary part with the skin) fits in with human skin and is not conspicuous, resulting in a non-uncomfortable appearance.

[0024] In the above embodiment, the skin-colored image may be a solid color image or a patterned image as described in Japanese Patent Publication No. 4632333.

[0025] As shown in Figures 7A and 7B, when the plan view shape of the solid opacity layer 21a transferred onto the stretchable sheet 13, the plan view shape of the entire opacity layer 21 consisting of the solid opacity layer 21a and the halftone opacity layer 21b, the plan view shape of the skin-colored image G1 (monochromatic image) formed on the receiving layer 22, and the plan view shape of the skin image G including the skin-colored image G1 and the gradient image G2 are all circular, it is preferable that the radius r10 of the opacity layer 21, the radius r11 of the solid opacity layer 21a, the radius r20 of the skin image G, and the radius r21 of the skin-colored image G1 have the following relationship. r20>r10>r21>r11

[0026] By setting r20 > r10, exposure of the concealing layer 21 is suppressed, and the color of the concealing layer 21 is prevented from showing through. R20 is preferably 101% to 120% of R10, and more preferably 105% to 115%.

[0027] By setting r10 > r21 > r11, a layered structure of halftone opacity layer 21b and gradient image G2 is obtained, and since the solid opacity layer 21a is not located below the gradient image G2, the outer edge of the skin-like design sheet blends in with human skin and becomes less noticeable.

[0028] The planar shape of the skin-pattern sheet is not limited to a circle, but may be an ellipse or a polygon, or a shape that includes multiple curved parts with different curvatures in its outline, a shape that includes multiple straight parts in its outline, or a shape that includes both curved and straight parts in its outline. The planar shape of the skin-pattern sheet is preferably a circle or a square, with a circle being particularly preferred. The area S10 of the entire concealing layer 21 in plan view, the area S11 of the solid concealing layer 21a, the area S20 of the skin image G, and the area S21 of the skin-color image G1 are preferably related as follows. S20>S10>S21>S11

[0029] In the above embodiment, if the gradient image is omitted and the entire skin image is a single-color skin-tone image, the edges of the skin design sheet become noticeable. Also, if a halftone image (dot pattern) is used instead of a gradient image, aligning the halftone dots of the halftone opacity layer 21b with the halftone dots of the skin image is extremely difficult, and if the halftone dot positions are misaligned, the color (white) of the opacity layer 21 becomes visible, making it even more noticeable. As in the above embodiment, by placing the gradient image G2 on the halftone opacity layer 21b, the edges of the skin design sheet can be made less noticeable.

[0030] The materials of the laminated sheet 10 will be described below.

[0031] The release sheet 11 of the laminated sheet 10 can be made of release paper that has been treated with a silicone release agent or the like. The thickness of the release sheet is preferably 130 μm to 210 μm.

[0032] It is preferable that the surface of the release sheet (the side on which the adhesive layer is provided) has multiple recesses (dimples). The planar shape of the recesses is approximately circular with a diameter of about 2 mm to 3 mm. The recess occupancy rate on the surface of the release sheet is about 3% to 20%. The bottom of the recesses is curved, and the depth of the deepest part is about 1 μm to 17 μm. By forming such recesses on the surface of the release sheet, the peeling force between the release sheet and the adhesive layer can be set to a suitable value.

[0033] The adhesive layer 12 preferably uses a urethane-based or acrylic-based adhesive that is less likely to cause skin irritation or inflammation. Furthermore, a gel-type adhesive is preferable to ensure good adhesion to the skin. The thickness of the adhesive layer is, for example, 15 μm to 30 μm.

[0034] The stretchable sheet 13 can be made of, for example, a urethane film. The stretchable sheet preferably has an elongation rate of about 30% to 100%, and more preferably about 60%, in order to follow the stretching and contracting of the skin when it is applied.

[0035] The elongation rate of the stretchable sheet is the elongation rate obtained by the test method compliant with JIS-K-7127 (1999). The elongation rate can be calculated using the following formula (1). Growth rate (%) = 100 × (L - L0) / L0 ... Equation (1)

[0036] In equation (1), L is the length at which the stretchable sheet breaks when pulled at a speed of 200 mm / min using a tensile testing machine. In equation (1), L0 is the length of the recording section before being pulled by the tensile testing machine. A tensile testing machine such as a Tensilon universal material tester can be used.

[0037] Furthermore, to allow water vapor from sweat through the skin to pass through, 1000g / (m 2 It is preferable that the moisture permeability is 24hr or higher.

[0038] The stretchable sheet is preferably 3 μm or thicker, and more preferably 5 μm or thicker, in order to prevent wrinkles during application and to improve workability. Furthermore, to minimize discomfort during application, the thickness of the stretchable sheet is preferably 30 μm or less.

[0039] Next, we will describe the materials used for the heat transfer sheet 20.

[0040] Examples of resins for forming the receiving layer 21 of the heat transfer sheet 20 include polyolefin resins such as polypropylene, halogenated polymers such as polyvinyl chloride, vinyl chloride / vinyl acetate copolymer, and polyvinylidene chloride, vinyl polymers such as polyvinyl acetate, ethylene / vinyl acetate copolymer, and polyacrylic ester, polyester resins such as polyethylene terephthalate and polybutylene terephthalate, polystyrene resins, polyamide resins, copolymer resins of olefins such as ethylene and propylene with other vinyl monomers, cellulose resins such as ionomers and cellulose diacetate, polycarbonate resins, polyvinyl acetal resins, and polyvinyl alcohol resins.

[0041] The concealing layer 22 can be a white layer which is a heat-seal layer containing white pigments such as silica, titanium oxide, titanium dioxide, zinc oxide, cerium oxide, titanium mica, muscovite, white carbon, calcium carbonate, barium sulfate, alumina white, or talc. The white layer preferably contains titanium oxide. The white layer may further contain pearl pigments.

[0042] The dye layer 23 can be a conventionally known one containing a binder resin and a sublimable dye.

[0043] A transparent resin material can be used for the protective layer 24. The protective layer 24 is preferably matte in appearance with low surface reflectivity to suppress glossiness when applied to the skin. Here, "matte" refers to a gloss level of 40% or less. The gloss level is measured using a gloss meter at an incident angle of 45°.

[0044] In the above embodiment, the release liner and adhesive layer may be omitted from the skin-like design sheet, and it may be attached to the skin with glue or water. Alternatively, the protective layer may be omitted from the skin-like design sheet.

[0045] In the above embodiment, an example of forming a skin image using a sublimation transfer method that has good color development, excellent gradation expression, and high durability was described. However, the method of forming the skin image is not limited to sublimation transfer, and a melt transfer method that transfers heat-meltable ink or an inkjet method may also be used. In the case of melt transfer, the ink is transferred using halftone dots smaller than the halftone dots of the halftone opacity layer to form a gradation image.

[0046] [Example of experiment] Fabrication of laminated sheets A 30 μm thick adhesive layer was formed by applying an acrylic-based weak tack to a release sheet (Sumitomo Paper Processing Co., Ltd., SLB-110WT, 170 μm thick). A urethane film (Okura Industries Co., Ltd., Silklon NES85, 15 μm thick) was laminated onto the adhesive layer as a stretchable sheet, creating a laminated sheet in which the release sheet, adhesive layer, and stretchable sheet were layered in that order.

[0047] Fabrication of skin-patterned sheets A laminated sheet was placed in a thermal transfer printer (DS620, manufactured by Dai Nippon Printing Co., Ltd.), and a 2 μm thick white layer (opacity layer) was transferred onto a urethane film in a circular shape when viewed from above. The white layer was transferred so that the center was solid white and the surrounding area was halftone. The radius of the solid white layer in the center was 10 mm, and the radius r10 of the entire white layer, including the solid white layer and the halftone white layer, was 15 mm. The halftone white layer was designed to have a gradient in halftone area ratio, gradually decreasing from 100% to 0% towards the outside.

[0048] A receptive layer was transferred onto the transferred white layer, forming a circular skin image on the transferred receptive layer. The skin image consisted of a skin-colored image in the center (skin color 21#EAB68F in Table 1) and a gradient image around it where the color gradually faded towards the outside (gradually fading from the skin color in the center). The radius of the central skin-colored image was set to 12 mm, and the ratio of the radius r20 of the skin image including the skin-colored image and the gradient image to the radius r10 of the white layer is shown in Table 2. Skin design sheets for Experimental Examples 1-6 were then prepared.

[0049] <<Evaluation of Boundary Visibility of Skin-Shaped Design Sheets>> The release liner was peeled off the skin-patterned sheets from Experimental Examples 1-6, and they were applied to human skin (arm). The edges of the skin-patterned sheets were visually inspected from a distance of 30 cm and evaluated according to the evaluation criteria below. The results are shown in Table 2.

[0050] "Evaluation Criteria" A: There was no discomfort at the edges, and it was fine. B: There was a slight oddity around the edges, but it was within an acceptable range. C: There was something strange about the edge.

[0051] [Table 2] [Explanation of symbols]

[0052] 10 Laminated Sheets 11. Release sheet 12 Adhesive layer 13 Stretchable Sheet 20 Heat Transfer Sheets 21 Concealment layer 22 Receptor layer 23 Dye layer 24 Protective layer

Claims

1. A skin-pattern sheet comprising a stretchable sheet, a concealing layer provided on the stretchable sheet, and a skin image formed on the concealing layer, The concealing layer comprises a solid concealing layer and a halftone concealing layer arranged to surround the solid concealing layer. The edges of the aforementioned skin image are a gradient image where the color becomes lighter towards the outside. A skin-patterned sheet in which the gradient image is positioned on the halftone opacifying layer.

2. The skin design sheet according to claim 1, wherein the area inside the gradient image of the skin image is a monochrome image.

3. The skin design sheet according to claim 2, wherein, when the area of ​​the concealing layer is S10, the area of ​​the solid concealing layer is S11, the area of ​​the skin image is S20, and the area of ​​the monochrome image is S21, S20 > S10 > S21 > S11.

4. The plan view shape of the aforementioned concealing layer and the solid concealing layer is circular. The aforementioned skin image and the aforementioned monochrome image are circular. The skin design sheet according to claim 3, wherein, when the radius of the opacity layer is r10, the radius of the solid opacity layer is r11, the radius of the skin image is r20, and the radius of the monochrome image is r21, r20 > r10 > r21 > r11.

5. The skin design sheet according to claim 1, wherein the skin image is formed on a receiving layer provided on the concealing layer.

6. The skin-pattern sheet according to claim 5, wherein the receiving layer has a larger size in the planar direction than the concealing layer.

7. The textured sheet according to any one of claims 1 to 6, further comprising an adhesive layer and a release sheet laminated sequentially on the side of the stretchable sheet opposite to the concealing layer.

8. A heat transfer sheet having an opacity layer is heated, the opacity layer is transferred onto a stretchable sheet in a predetermined shape, and the opacity layer is transferred in a halftone pattern surrounding the transferred opacity layer. A step of forming a skin image on the transferred concealing layer, Equipped with, A method for manufacturing a skin-patterned sheet, wherein the peripheral area of ​​the aforementioned skin image is a gradient image where the color becomes lighter towards the outside.

Images