Skin design sheet and skin design sheet manufacturing method

Abstract

To enable a reception layer to be stably thermal-transferred onto an elastic sheet.SOLUTION: A laminated sheet has: a band-like peelable sheet; an adhesive layer provided on the peelable sheet; and an elastic sheet provided on the adhesive layer. The elastic sheet has a melting point of 155°C or higher. The elastic sheet may have a melting point of 215°C or lower. The elastic sheet may be a urethane film. The elastic sheet may include a crystalline material. The adhesive layer may be for attachment to skin.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a laminated sheet, a skin-design sheet, and a method for manufacturing a skin-design sheet. [Background technology]

[0002] Skin design sheets, such as tattoo stickers and skin concealing sheets, are known for application to the skin. Tattoo stickers with various designs printed on them are sold at variety stores, sporting and music event venues, amusement parks, etc., and are used to liven up the atmosphere.

[0003] Skin-concealing sheets are sheets in which a base material is pre-colored with a predetermined color by screen printing or the like, and are used to conceal discolorations such as skin blemishes and blemishes. Users choose one that matches their skin color. For example, a skin-concealing sheet is made up of a release sheet, an adhesive layer, a stretchable base material, and a cover sheet laminated in that order, and is attached to the user's skin by peeling off the release sheet, attaching the adhesive layer to the skin, and then peeling off the cover sheet.

[0004] Users can choose a skin concealing sheet that matches their natural skin color from the multiple colors available on the market, but the colors of skin concealing sheets on the market are limited, and users can be bothered by the color difference between the skin concealing sheet and their natural skin, which can leave them dissatisfied.

[0005] It is conceivable to produce a skin-concealing sheet by on-demand printing in a color that matches the user's skin tone. A dye-sublimation thermal transfer printer, which has excellent color reproducibility and gradation, is suitable for printing. Thermal transfer printers heat a thermal transfer sheet and transfer dyes to form an image, so the skin-concealing sheet must be provided with a receiving layer to receive the dye. If a receiving layer is provided on a stretchable substrate in advance, there is a risk that the stretchable substrate may melt, be damaged, or be denatured or deformed by the solvent contained in the coating liquid during the process of applying and drying a coating liquid for the receiving layer on the stretchable substrate. Therefore, it is preferable to transfer the receiving layer onto the stretchable substrate by thermal transfer. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2009-100851 Summary of the Invention [Problem to be solved by the invention]

[0007] An object of the present disclosure is to provide a laminated sheet, a skin design sheet, and a method for manufacturing a skin design sheet that can stably thermally transfer a receiving layer onto a stretchable sheet. [Means for solving the problem]

[0008] The laminated sheet of the present disclosure comprises a strip-shaped release sheet, an adhesive layer provided on the release sheet, and an elastic sheet provided on the adhesive layer, wherein the melting point of the elastic sheet is 155°C or higher.

[0009] The method for manufacturing a skin design sheet of the present disclosure includes the steps of using a thermal transfer printer to transfer a receiving layer onto the stretchable sheet of the laminated sheet of the present disclosure and transferring a dye to the receiving layer to form an image, transferring a protective layer onto the image to produce a skin design sheet including the adhesive layer, the stretchable sheet, the receiving layer, and the protective layer, and cutting out an area including the skin design sheet from the laminated sheet.

[0010] The skin design sheet of the present disclosure comprises an adhesive layer, an elastic sheet provided on the adhesive layer, and a receiving layer provided on the elastic sheet and having a skin image printed thereon, wherein the melting point of the elastic sheet is 155°C or higher. [Effects of the Invention]

[0011] According to the present disclosure, a receptor layer can be stably thermally transferred onto a stretchable sheet. [Brief explanation of the drawings]

[0012] [Figure 1] 1a and 1b are cross-sectional views of the laminated sheet. [Figure 2] FIG. 2a is a cross-sectional view of the laminated sheet, and FIG. 2b is a plan view of the laminated sheet. [Figure 3] FIG. 3a is a cross-sectional view of the laminated sheet, and FIG. 3b is a plan view of the laminated sheet. [Figure 4] FIG. 2 is a plan view of a laminated sheet. [Figure 5] FIG. 1 is a schematic diagram illustrating the configuration of a printer. [Figure 6] FIG. 2 is a plan view of a thermal transfer sheet. [Figure 7] 7a to 7c are diagrams illustrating the process of removing the protective film. [Figure 8] FIG. 8a is a cross-sectional view of the laminated sheet, and FIG. 8b is a plan view of the laminated sheet. [Figure 9] FIG. 9a is a cross-sectional view of the laminated sheet, and FIG. 9b is a plan view of the laminated sheet. DETAILED DESCRIPTION OF THE INVENTION

[0013] 1a is a cross-sectional view of a laminated sheet 20 used in the manufacture of a skin-design sheet according to an embodiment of the present disclosure. The laminated sheet 20 is a long strip, and has a release sheet 21, an adhesive layer 22 (first adhesive layer), and an elastic sheet 23 laminated in this order.

[0014] Peel-off sheet Release paper or the like that has been subjected to a silicone release treatment or the like can be used as the release sheet 21. The thickness of the release sheet is preferably about 130 μm or more and 210 μm or less.

[0015] The release sheet preferably has a bending resistance of 150 mg to 2500 mg, more preferably 280 mg to 2100 mg. A bending resistance of 150 mg or more can prevent jamming during image formation in the printer 4, which will be described later. A bending resistance of 2500 mg or less can easily cut the release sheet using a cutter 38 (see FIG. 5) of the printer 4, which will be described later.

[0016] The surface of the release sheet (the surface on which the adhesive layer is provided) preferably has a plurality of recesses (dimples). The planar shape of the recesses is approximately circular with a diameter of approximately 2 mm to 3 mm. The recess occupancy rate on the surface of the release sheet is approximately 3% to 20%. The bottoms of the recesses are curved, and the depth of the deepest part is approximately 1 μm to 17 μm. By forming such recesses on the surface of the release sheet, the peel force between the release sheet and the adhesive layer can be adjusted to an appropriate value. Furthermore, in the image formation process on the laminated sheet using a printer described below, an appropriate printing pressure can be applied, preventing the occurrence of orange peel.

[0017] adhesive layer The adhesive layer 22 is preferably made of a urethane or acrylic adhesive that is less likely to cause rashes or inflammation on the skin. Furthermore, a gel-type adhesive is preferable to ensure close contact with the skin. The thickness of the adhesive layer is, for example, 15 μm or more and 30 μm or less.

[0018] Elastic sheet For example, a urethane sheet can be used as the stretchable sheet 23. The stretchable sheet preferably has an elongation rate of approximately 30% to 100%, more preferably approximately 60%, so that it can follow the expansion and contraction of the skin when attached.

[0019] The elongation percentage of the stretchable sheet is determined by a test method conforming to JIS-K-7127 (1999). The elongation percentage can be calculated using the following formula (1). Elongation (%) = 100 × (L - L0) / L0 Equation (1)

[0020] In formula (1), L is the length at which the stretchable sheet breaks (ruptures) when it is pulled at a speed of 200 mm / min using a tensile tester. L0 in formula (1) is the length of the recorded portion before being pulled by the tensile tester. A Tensilon universal material testing machine or the like can be used as the tensile tester.

[0021] In addition, to allow permeation of sweat vapor from the skin, 1000g / (m 2 It is preferable that the material has a moisture permeability of at least 24 hours.

[0022] The thickness of the stretchable sheet is preferably 5 μm or more, more preferably 7 μm or more, to prevent wrinkles during application and to improve workability, and is preferably 30 μm or less to prevent discomfort during application.

[0023] The stretchable sheet preferably has a melting point of 155°C or higher so that the receiving layer can be stably transferred onto the stretchable sheet in the transfer process of the receiving layer using a printer described below. The stretchable sheet preferably has a melting point of 215°C or lower so that it is flexible and does not feel uncomfortable when applied.

[0024] The stretchable sheet preferably contains a crystalline material and has a melting point peak measured by a differential scanning calorimeter (DSC). It is even more preferable that the stretchable sheet be made of a crystalline material and have a melting point peak measured by a differential scanning calorimeter. This allows for stable transfer of the receptor layer. For example, several stacked stretchable sheets are cut out to a diameter of approximately 5 mm to prepare a sample weighing approximately 5 mg. The sample is placed in a differential scanning calorimeter (DSC-7000X, Hitachi High-Tech Corporation) and measured in a nitrogen gas atmosphere with a heating and cooling rate set to 7.5°C / min using the following temperature program:

[0025] [Table 1]

[0026] In order to facilitate handling of the laminated sheet 20 in which the release sheet 21, adhesive layer 22, and stretchable sheet 23 are laminated in this order, a processing film 40 may be provided on the stretchable sheet 23, as shown in Fig. 1b. The processing film 40 may be an LDPE film or the like having a thickness of about 30 µm to 60 µm.

[0027] As shown in Figures 2a and 2b, the adhesive layer 22 and stretchable sheet 23 of the laminated sheet 20 are processed into the shape of the product form of the skin-design sheet using a known cutting device. Figure 2a is a cross-sectional view taken along line IIa-IIa in Figure 2b. For example, as shown in Figures 2a and 2b, the adhesive layer 22 and stretchable sheet 23 are processed into a circular shape in plan view. The circular adhesive layer 22 and stretchable sheet 23 are formed at predetermined intervals in the longitudinal direction. The circular adhesive layer 22 and stretchable sheet 23 arranged in the longitudinal direction may be in one row or multiple rows. Figures 2a and 2b show an example of two rows.

[0028] If the process film 40 is provided, it is peeled off from the stretchable sheet 23 when the laminated sheet 20 is set in the cutting device.

[0029] After the adhesive layer 22 and the stretchable sheet 23 have been processed into a product form, a long strip-shaped protective film 24 is attached to the laminate sheet 20, as shown in Figures 3a and 3b. The protective film 24 has a weak adhesive layer 25 (second adhesive layer) provided on one side thereof. The weak adhesive layer 25 is provided in a position that does not contact the adhesive layer 22 or the stretchable sheet 23. For example, in the example shown in Figure 3a, three lines of the weak adhesive layer 25 are provided on one side of the protective film 24, and are attached to the surface of the release sheet 21 at three locations: outside the stretchable sheet 23 (and adhesive layer 22) in the width direction (short direction), and between the stretchable sheets 23, 23.

[0030] An LDPE film or a PP film having a thickness of about 30 μm to 60 μm can be used for the protective film 24. An acrylic or urethane weak adhesive can be used for the weak adhesive layer 25.

[0031] Next, using a known cutting device, a plurality of half cuts 26 extending in the width direction are formed at predetermined intervals in the protective film 24, as shown in Fig. 4. The half cuts 26 are formed at positions between the stretchable sheets 23. For example, the half cuts 26 are formed at positions between the stretchable sheets 23, 23 adjacent in the longitudinal direction.

[0032] The laminated sheet 20 having the half cut 26 formed in the protective film 24 is wound into a roll to produce a laminated sheet roll, which is set in the printer 4 shown in FIG.

[0033] FIG. 5 is a schematic diagram of the printer 4, and FIG. 6 is a plan view of a thermal transfer sheet 10 used in the printer 4. As shown in FIG.

[0034] The thermal transfer sheet 10 is wound around a supply section 33, and is fed from the supply section 33, passes through the thermal head 31, and is wound around and collected by a collection section .

[0035] The thermal transfer sheet 10 has a transfer-type receiving layer 11, a yellow dye layer 12, a magenta dye layer 13, a cyan dye layer 14, and a protective layer 15 formed in surface order from the recovery section 34 side on one surface of a base sheet (not shown). The receiving layer 11 is a transparent layer that receives the dye transferred from the thermal transfer sheet 10. The yellow dye layer 12, the magenta dye layer 13, and the cyan dye layer 14 contain a binder resin and a sublimable dye. Known materials can be used for the yellow dye layer 12, the magenta dye layer 13, and the cyan dye layer 14.

[0036] Examples of resins for forming the receiving layer 11 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, ionomers, cellulose resins such as cellulose diacetate, polycarbonate resins, polyvinyl acetal resins, and polyvinyl alcohol resins.

[0037] A transparent resin material can be used for the protective layer 15. Furthermore, the protective layer 15 is preferably matte with low surface reflectance to prevent shine when applied to the skin. Here, "matte" refers to a state with a glossiness of 40% or less. The glossiness is measured using a gloss meter at an incident angle of 45°.

[0038] The laminate sheet 20 is unwound from a laminate sheet roll 36. The laminate sheet roll 36 is manufactured by the method described above and is attached to a reel part (not shown). When the reel part is rotated (forward / reverse), the laminate sheet roll 36 rotates, and the laminate sheet 20 is unwound or wound. The laminate sheet 20 has a high stiffness because the release sheet 21 has a bending resistance of 150 mg or more and a protective film 24 is provided on the elastic sheet 23, ensuring stable transportability within the printer 4.

[0039] In the printer 4, a rotatable platen roll 32 is provided on the opposite side of the thermal head 31 with the thermal transfer sheet 10 sandwiched between them. The thermal head 31 and the platen roll 32 sandwich the laminated sheet 20 and the thermal transfer sheet 10 and heat the thermal transfer sheet 10.

[0040] A conveying guide 35 is provided downstream of the thermal head 31 in the conveying direction of the laminated sheet 20. A cutter 38 is provided downstream of the conveying guide 35 in the conveying direction of the laminated sheet 20 and near the discharge port (not shown) of the printer 4.

[0041] To form an image of a desired color on the stretchable sheet 23 of the laminated sheet 20, it is necessary to peel off the protective film 24. Therefore, before forming the image, as shown in Fig. 7a, the leading end of the laminated sheet 20 is ejected from the printer 4 through the ejection port of the printer 4 to the outside, and in that state, the conveyance of the laminated sheet 20 is temporarily stopped.

[0042] As shown in Fig. 7b, an operator peels off the protective film 24 from the leading end of the laminated sheet 20 and cuts it along the half cut 26. After peeling off the protective film 24, the leading end of the laminated sheet 20 is rewound into the printer 4 as shown in Fig. 7c.

[0043] When the stretchable sheet 23 with its surface exposed reaches the thermal head 31, the thermal head 31 heats the transfer-type receiving layer 11 and transfers the receiving layer 11 onto the stretchable sheet 23 of the laminated sheet 20, as shown in Figures 8a and 8b. The receiving layer 11 is transferred to match the shape of the stretchable sheet 23. The stretchable sheet 23 has a melting point of 155°C or higher, so the receiving layer 11 can be transferred stably.

[0044] Next, the thermal head 31 sequentially heats the yellow dye layer 12, the magenta dye layer 13, and the cyan dye layer 14 based on the data of the skin design sheet, transferring the dyes to the receiving layer 11 on the image receiving sheet 20 and forming the skin design sheet image G.

[0045] Next, the protective layer 15 of the thermal transfer sheet 10 is heated, and the protective layer 15 is transferred onto the receiving layer 11 on which the skin design sheet image G is formed, as shown in Figures 9a and 9b. This forms a skin design sheet 5 on the release sheet 21, in which the adhesive layer 22, the stretchable sheet 23, the receiving layer 11 on which the skin design sheet image G is formed, and the protective layer 15 are laminated in this order.

[0046] Thereafter, the cutter 38 cuts the tip of the release sheet 21 in the width direction, cutting out the area where the skin design sheet 5 is provided from the laminated sheet 20, and ejecting it from the printer 4. The cutter 38 only needs to cut the release sheet 21 portion, and the blade does not come into contact with the adhesive layer 22, so it is possible to suppress a decrease in cutting performance with use. In addition, because the bending resistance of the release sheet 21 is 2500 mg or less, it is easy for the cutter 38 to cut the release sheet 21.

[0047] A cover sheet may be attached onto the skin design sheet 5 (protective layer 15) discharged from the printer 4.

[0048] Thus, according to this embodiment, the skin design sheet 5 is produced on demand from a photographed image of the user P, so that the color of the skin design sheet 5 matches the natural skin color of the user P, thereby reducing the sense of discomfort when the skin design sheet 5 is applied to the skin and resulting in a natural finish.

[0049] Furthermore, since the melting point of the stretchable sheet 23 is 155° C. or higher, the receiving layer 11 can be stably transferred onto the stretchable sheet 23, and a high-quality skin-design sheet can be produced.

[0050] It is preferable that the conveyance guide 35 and guide rollers (not shown) in the printer 4 are made of non-adhesive materials.

[0051] In the above embodiment, the transfer-type receptor layer 11 provided on the thermal transfer sheet 10 used in the printer 4 may be a white receptor layer. The white receptor layer is formed by laminating a transparent receptor layer and a primer layer containing a white pigment 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 use of the white receptor layer suppresses reflected light from the discolored area S, enhances the concealment of the discolored area S, and improves the reproducibility of the desired skin color. The transparent receptor layer may contain light-scattering particles.

[0052] A hiding layer may be further provided on the white layer (primer layer containing a white pigment) of the white receiving layer. The hiding layer is preferably a metal pigment, such as aluminum, nickel, chromium, brass, tin, brass, bronze, zinc, silver, platinum, gold, and oxides thereof, as well as particles of glass or the like subjected to metal vapor deposition. Among these, aluminum pigments are particularly preferred in terms of the transferability and glossiness of the hiding layer. The aluminum pigment may be either a leafing type or a non-leafing type, but non-leafing types are preferred in terms of the transferability and glossiness of the hiding layer.

[0053] In the above embodiment, the part photographed by the photographing device 1 of the skin design sheet manufacturing system may be other than the face.

[0054] In the above embodiment, an example was described in which the photographing device 1 photographs the user P and generates a facial image, but the user P may prepare facial image data in advance and store it in a portable terminal such as a smartphone or a portable storage medium such as a USB memory, and then input the facial image data into the arithmetic and control device 2. [Example]

[0055] The present disclosure will now be described in more detail with reference to examples, but the present disclosure is not limited to these examples.

[0056] (Preparation of laminated sheets) An acrylic weak adhesive was applied as an adhesive to a release sheet (SLB-110WT, manufactured by Sumitomo Kakoshi Co., Ltd., thickness 170 μm) to form an adhesive layer with a thickness of 30 μm. A urethane film (stretchable sheet) was attached to the adhesive layer, and the release sheet, adhesive layer, and stretchable sheet were laminated in this order to form Example 1. 、2、 Laminated sheets of Example 4 and Comparative Example 1 were prepared. 、2、 The urethane films used in the laminated sheets of Example 4 and Comparative Example 1 are as shown in Table 2.

[0058] (Preparation of thermal transfer sheet) A 4.5 μm thick polyethylene terephthalate film (manufactured by Toray) was prepared as the substrate, and a receiving layer coating liquid having the following composition was applied to the surface of this substrate using a bar coater.After pre-drying with a dryer, it was dried in an oven at 100°C for 1 minute to form a 2 μm thick receiving layer, and a thermal transfer sheet was produced.

[0059] [Receptor layer coating liquid composition] Vinyl chloride-vinyl acetate copolymer 15.8 parts (Solvine (registered trademark) CNL, Nissin Chemical Industry Co., Ltd.) Vinyl chloride-vinyl acetate copolymer 1 part (Solvine (registered trademark) C, Nissin Chemical Industry Co., Ltd.) Epoxy-modified silicone oil 1.2 parts (KF-101 Shin-Etsu Chemical Co., Ltd.) Methylstyrene-modified silicone oil 1.2 parts (X-24-510 Shin-Etsu Chemical Co., Ltd.) Polyether-modified silicone oil 0.8 parts (KF-352A Shin-Etsu Chemical Co., Ltd.) 40 parts methyl ethyl ketone 40 parts toluene

[0060] (Transfer of the receiving layer) Example 1 、2、4 The transfer-type receiving layer provided on the thermal transfer sheet was transferred onto the urethane film of the laminated sheet of Comparative Example 1 under the following conditions.

[0061] [Transfer conditions] Thermal head: KGT-217-12MPL20 (Kyocera Corporation) Heating element average resistance: 31915 (Ω) Print density in the main scanning direction: 300 dpi Sub-scanning direction print density: 300 dpi ·Applied power: 0.12(w / dot) 1 line period: 5 (msec.) ·Printing start temperature: 40(℃) Applied pulse: A multi-pulse test printer was used that could vary the number of divided pulses, each with a pulse length that divides one line cycle into 256 equal parts, from 0 to 255 during one line cycle. The duty ratio of each divided pulse was fixed at 60%, and the number of pulses per line cycle was fixed at 255.

[0062] <<Evaluation of printability of transfer-type receptor layer>> The printability of the transfer-type receptor layer was evaluated based on the following criteria, and the results are shown in Table 2.

[0063] "Evaluation Criteria" A: The urethane film and the receiving layer of the transfer mold were adhered, and the receiving layer of the transfer mold could be peeled off from the substrate of the thermal transfer sheet, resulting in normal printing. B: The urethane film and the receiving layer of the transfer mold were fused together, and the receiving layer of the transfer mold could not be peeled off from the substrate of the thermal transfer sheet, resulting in poor printing.

[0064] <<Tactile evaluation>> The laminated sheet to which the receiving layer had been transferred was touched with a hand and evaluated for tactile sensation based on the following evaluation criteria. The results are shown in Table 2.

[0065] "Evaluation Criteria" A: It was flexible and felt good to the touch. B: It was not flexible and felt hard.

[0066] [Table 2] [Explanation of symbols]

[0067] 4 Printers 10 Thermal transfer sheet 11 Receptor 15 Protective layer 20 Laminated Sheet 21 Peel-off sheet 22 Adhesive layer 23 Elastic Sheet 24 Protective Film 25 Low adhesive layer

Claims

1. A process for preparing a laminated sheet having a strip-shaped release sheet, a plurality of adhesive layers provided on the release sheet at predetermined intervals along the longitudinal direction of the release sheet, and an elastic sheet provided on the adhesive layer, wherein the melting point of the elastic sheet is 155°C or higher; transferring a receiving layer onto the stretchable sheet of the laminated sheet using a thermal transfer printer and transferring a dye to the receiving layer to form an image; A step of transferring a protective layer onto the image to prepare a skin-design sheet including the adhesive layer, the stretchable sheet, the receiving layer, and the protective layer; A method for manufacturing a skin design sheet comprising:

2. The method for manufacturing a skin design sheet according to claim 1, further comprising a step of cutting out an area including the skin design sheet from the laminated sheet.

3. An adhesive layer; a stretchable sheet provided on the adhesive layer; a receiving layer provided on the stretchable sheet and having a skin image printed thereon; Equipped with The skin design sheet, wherein the melting point of the stretchable sheet is 155°C or higher.

4. The skin-design sheet according to claim 3, wherein the melting point of the stretchable sheet is 215°C or less.

5. The skin-design sheet according to claim 3 or 4, wherein the stretchable sheet is a urethane film.

6. The skin design sheet according to any one of claims 3 to 5, wherein the stretchable sheet contains a crystalline material.

Images