Laminated sheet, skin design sheet, and method for producing skin design sheet

Abstract

To provide a laminated sheet usable as a skin design sheet printable by a printer.SOLUTION: A laminated sheet comprises a release sheet, an adhesive layer, and a substrate layer in this order, wherein a ratio (T1 / T2) of the thickness (T1) of the adhesive layer to the thickness (T2) of the substrate layer is 0.50 or less.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a laminated sheet, a skin design sheet, and a method for producing a skin design sheet. [Background technology]

[0002] Skin design sheets that are applied to the skin are known (see, for example, Patent Document 1). The skin design sheet includes, for example, a release sheet, an adhesive layer, a base layer, and a protective sheet in this order in the thickness direction. The release sheet is peeled off from the adhesive layer, the adhesive layer is applied to the skin, and then the protective sheet is peeled off from the base layer, in the following procedure to apply the skin design sheet to the user's skin.

[0003] Examples of skin design sheets include tattoo stickers and skin concealing sheets. Tattoo stickers are sheets with various designs printed on a substrate. Tattoo stickers are sold, for example, at variety stores, sporting and music event venues, amusement parks, and the like, and are used to liven up the atmosphere. Skin concealing sheets are sheets with a substrate colored in advance with a predetermined color by screen printing or the like. Skin concealing sheets are used, for example, to conceal discolored areas such as skin scratches or blemishes. Users choose a skin design sheet that matches their skin color. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 6147874 Summary of the Invention [Problem to be solved by the invention]

[0005] However, the colors of skin concealing sheets available on the market are limited, and the color difference between the skin concealing sheet and the skin can be a concern and dissatisfaction. Therefore, it has been considered to provide a skin design sheet that matches the color of the user's skin by forming an image on a laminated sheet that includes a release sheet, an adhesive layer, a base layer, and a protective sheet in this order in the thickness direction by on-demand printing from a photographed image of the user. This can reduce the discomfort felt when the skin design sheet is applied to the user's skin.

[0006] Therefore, when we tried to print on a laminated sheet for a skin design sheet using a printer, when inserting the laminated sheet into the printer, curling occurred between the release sheet and the adhesive layer at the conveying roller section, and in some cases it was impossible to insert it into the printer.

[0007] An object of the present disclosure is to provide a laminated sheet that can be used as a skin design sheet that can be printed on with a printer. Another object of the present disclosure is to provide a skin design sheet whose color matches the skin color of the user, and a manufacturing method thereof. [Means for solving the problem]

[0008] The laminate sheet of the present disclosure comprises a release sheet, an adhesive layer, and a base layer in this order, and the ratio (T1 / T2) of the thickness (T1) of the adhesive layer to the thickness (T2) of the base layer is 0.50 or less. Effect of the Invention

[0009] According to the present disclosure, it is possible to provide a laminate sheet that can be used as a skin design sheet that can be printed on with a printer. Furthermore, according to the present disclosure, it is possible to provide a skin design sheet whose color matches the skin color of the user. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a cross-sectional view of a laminate sheet. [Diagram 2]FIG. 2 is a cross-sectional view for explaining a method for measuring insertion resistance in an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, the embodiments of the present disclosure will be described in detail. The present disclosure can be implemented in many different forms, and is not to be interpreted as being limited to the description of the embodiments exemplified below. In the drawings, the width, thickness, shape, etc. of each layer may be shown diagrammatically in order to make the explanation clearer, but these are merely examples and do not limit the interpretation of the present disclosure. In this specification and each figure, elements similar to those already explained with respect to the previous figures are given the same reference numerals, and detailed explanations may be omitted as appropriate.

[0012] In the present disclosure, when multiple upper limit candidates and multiple lower limit candidates are listed for a certain parameter, the numerical range of the parameter may be configured by combining any one upper limit candidate and any one lower limit candidate. Examples of the above parameters include physical property values, component content ratios, and layer thicknesses. As an example, the description "Parameter B is preferably A1 or more, more preferably A2 or more, and even more preferably A3 or more. Parameter B is preferably A4 or less, more preferably A5 or less, and even more preferably A6 or less." will be explained. In this example, the numerical range of parameter B may be A1 or more and A4 or less, A1 or more and A5 or less, A1 or more and A6 or less, A2 or more and A4 or less, A2 or more and A5 or less, A2 or more and A6 or less, A3 or more and A4 or less, A3 or more and A5 or less, or A3 or more and A6 or less.

[0013] In this specification, each of the components (for example, resin materials, and additives such as colorants) appearing in the following description may be used either alone or in combination of two or more kinds.

[0014] [Laminated sheet] The laminate sheet of the present disclosure comprises, in this order, a release sheet, an adhesive layer, and a base layer.

[0015] Specific examples of the laminate sheet of the present disclosure will be described below with reference to the drawings. The laminated sheet 1 shown in Fig. 1 includes a release sheet 10, an adhesive layer 20, and a base layer 30 in this order in the thickness direction. In this example, one or both of the adhesive layer 20 and the base layer 30 may be colored with a colorant to a desired color, such as skin color. A printed layer may be provided on one or both surfaces of the base layer 30.

[0016] The laminate sheet may further include a protective sheet (not shown) on the surface of the base layer opposite to the surface facing the adhesive layer. The laminate sheet may include a release sheet, an adhesive layer, a base layer, and, if necessary, a protective sheet in this order in the thickness direction.

[0017] The laminate sheet may include, in this order, a release sheet, an adhesive layer, a substrate layer, a receiving layer on which an image is formed, and, in this order, a protective sheet, if necessary. The laminate sheet may include, in this order, a release sheet, an adhesive layer, a substrate layer, a receiving layer on which an image is formed, a protective layer, and, in this order, a protective sheet, if necessary. In these examples, an image of a desired color, such as flesh color, is formed on the receiving layer by a coloring agent such as a dye.

[0018] In one embodiment, the laminate sheet of the present disclosure has a long strip shape, and FIG. 1 is a cross-sectional view perpendicular to the longitudinal direction of the laminate sheet 1, for example.

[0019] <Release sheet> The laminated sheet of the present disclosure includes a release sheet. Examples of the release sheet include release paper with at least one side of a paper substrate treated for release, and resin film with at least one side of a resin film treated for release. Examples of the release treatment include release treatment using a release agent such as a silicone resin-based release agent, an alkyd resin-based release agent, a long-chain alkyl compound-based release agent, and a fluororesin-based release agent. Examples of the resin film include resin films formed from resin materials such as polyolefin, vinyl resin, styrene resin, acrylic resin, fluororesin, polyester, and polyamide.

[0020] The thickness of the release sheet is preferably 50 μm or more, more preferably 100 μm or more, and is preferably 300 μm or less, more preferably 200 μm or less. The thickness of the release sheet is, for example, 50 μm or more and 300 μm or less.

[0021] <Adhesive layer> The laminated sheet of the present disclosure includes an adhesive layer. The adhesive layer is formed, for example, using an adhesive. An adhesive is also called a pressure-sensitive adhesive, and refers to a material that has adhesiveness at room temperature and can be attached to an adherend by applying pressure. For example, even when an adherend attached to the adhesive layer is peeled off, the adhesive layer retains a practical adhesive strength.

[0022] Examples of the adhesive include acrylic adhesives, urethane adhesives, silicone adhesives, rubber adhesives, vinyl alkyl ether adhesives, polyester adhesives, polyamide adhesives, and fluorine adhesives. The adhesive may contain a solvent. For example, either a water-based or solvent-based solvent can be used. For the adhesive, it is preferable to select an adhesive that is less likely to cause skin rash or irritation for medical use, and for example, acrylic adhesives and urethane adhesives are preferable.

[0023] The adhesive layer may contain an additive. Examples of the additive include an ultraviolet absorber, a light stabilizer, an antioxidant, a colorant, a filler, and a release agent. The adhesive layer may contain a colorant as necessary. The adhesive layer may contain a colorant to match the color tone of the laminated sheet to a desired color, such as skin color. Examples of the colorant include pigments and dyes.

[0024] The adhesive strength of the adhesive layer is preferably 5000gf / 50mm or less, more preferably 100gf / 50mm or more and 5000gf / 50mm or less. If the adhesive strength is 5000gf / 50mm or less, for example, there is little risk of damaging the adherend (particularly the skin of a human body or an animal) when the sheet is misattached or peeled off when replacing. If the adhesive strength is 100gf / 50mm or more, for example, the adhesive strength to the adherend (particularly the skin of a human body or an animal) can be secured, and peeling of the sheet due to sweating or movement of the skin can be suppressed.

[0025] The peel strength of the release sheet between the release sheet and the adhesive layer is preferably 120 mN / 20 mm or more, more preferably 150 mN / 20 mm, and even more preferably 170 mN / 20 mm. If the peel strength is 120 mN / 20 mm or more, peeling of the release sheet can be suppressed when the laminated sheet is inserted into a printer. The peel strength is measured in accordance with the method (90° peel) described in JIS Z 0237:2009.

[0026] The thickness of the adhesive layer is preferably 3 μm or more, more preferably 5 μm or more, and is preferably 40 μm or less, more preferably 30 μm or less. The thickness of the adhesive layer is, for example, 3 μm or more and 40 μm or less.

[0027] <Base material layer> The laminate sheet of the present disclosure includes a substrate layer. The substrate layer may be, for example, a resin film formed from a resin material, such as polyurethane, polyester, polyamide, polyimide, polyolefin, vinyl resin, styrene resin, acrylic resin, or cellulose resin.

[0028] As the base layer, for example, a stretchable base material is preferably used. Examples of the stretchable base material include the above-mentioned resin films, and among the above-mentioned resin films, polyvinyl chloride (PVC) films, urethane films, and polyethylene films are preferred.

[0029] The stretchable substrate preferably has an elongation percentage of 30% or more and 100% or less so that it can follow the expansion and contraction of the adherend when the laminate sheet is attached to the adherend. The elongation percentage of the stretchable substrate is the elongation percentage obtained by a test method in accordance with JIS K 7127:1999. The elongation percentage is expressed by the following formula (1). Elongation rate (%) = 100 × (LL 0 ) / L 0 (1)

[0030] L in formula (1) is the length at which the elastic substrate breaks when the elastic substrate is pulled at a speed of 200 mm / min using a tensile tester. 0 is the length of the elastic substrate before being pulled by the tensile tester. A Tensilon universal material testing machine can be used as the tensile tester.

[0031] The substrate layer may contain an additive. Examples of the additive include an ultraviolet absorbing agent, a light stabilizer, an antioxidant, a colorant, a filler, and a release agent. The substrate layer may contain a colorant as necessary. The substrate layer may contain a colorant to match the color tone of the laminated sheet to a desired color, such as skin color. Examples of the colorant include a pigment and a dye.

[0032] The thickness of the base layer is preferably 5 μm or more, more preferably 15 μm or more, and even more preferably 30 μm or more. A laminate sheet having a base layer with a thickness of 5 μm or more can, for example, suppress the occurrence of wrinkles when the sheet is applied. In particular, a laminate sheet having a base layer with a thickness of 30 μm or more can easily peel off and apply the release sheet without twisting the base layer (seal paper) when peeling it off from the laminate sheet, improving workability. The thickness of the base layer is preferably 120 μm or less, more preferably 115 μm or less, further preferably 70 μm or less, and particularly preferably 50 μm or less. A laminate sheet having such a base layer can, for example, suppress a sense of discomfort felt by a user after application of the sheet.

[0033] A printing layer may be provided on the base layer. The printing layer may be a layer for adjusting the color tone of the laminated sheet to a desired color such as skin color. The printing layer contains a colorant. Examples of the colorant include pigments and dyes.

[0034] (protective layer) The laminate sheet of the present disclosure may be provided with a protective layer. The laminate sheet of the present disclosure may include, for example, a release sheet, an adhesive layer, a substrate layer, and a protective layer in this order, or may include a release sheet, an adhesive layer, a substrate layer, a receiving layer on which an image is formed, and a protective layer in this order. The receiving layer will be described later.

[0035] The protective layer may be made of, for example, a resin material, such as polyester, polyamide, polyurethane, polycarbonate, vinyl resin, styrene resin, acrylic resin, acrylic polyol resin, cellulose resin, phenoxy resin, epoxy resin, silicone-modified versions of these resins, ultraviolet absorbing resins, and ionizing radiation curable resins.

[0036] Examples of polyesters include polyethylene terephthalate and polyethylene naphthalate. Examples of vinyl resins include vinyl chloride-vinyl acetate copolymers, polyvinyl chloride, polyvinyl acetate, polyvinyl alcohol, polyvinyl butyral, polyvinyl acetal, and polyvinyl pyrrolidone. Examples of cellulose resins include ethyl cellulose, hydroxyethyl cellulose, ethyl hydroxycellulose, methyl cellulose, and cellulose acetate.

[0037] Examples of ionizing radiation curable resins include resins obtained by crosslinking and curing a radical polymerizable polymer or a radical polymerizable oligomer by exposure to ionizing radiation. Specific examples include resins obtained by adding a photopolymerization initiator to a radical polymerizable polymer or a radical polymerizable oligomer as necessary, and polymerizing and crosslinking the resulting polymer by exposure to an electron beam or ultraviolet light.

[0038] The content of the resin material in the protective layer is preferably 80% by mass or more, and more preferably 85% by mass or more, based on the total mass of the protective layer, which can provide, for example, sufficient durability to the protective layer.

[0039] The protective layer may contain an additive. Examples of the additive include an ultraviolet absorbing agent, a light stabilizer, an antioxidant, a colorant, a filler, and a release agent. The protective layer may contain a colorant as necessary. The protective layer may contain a colorant to match the color tone of the laminated sheet to a desired color, such as skin color. Examples of the colorant include pigments and dyes.

[0040] The content of the additive in the protective layer is preferably 1% by mass or more, more preferably 2% by mass or more, and preferably 20% by mass or less, more preferably 15% by mass or less, based on the total mass of the protective layer. The content of the additive in the protective layer is, for example, 1% by mass or more and 20% by mass or less.

[0041] The thickness of the protective layer is preferably 0.1 μm or more, more preferably 0.5 μm or more, even more preferably 1 μm or more, and is preferably 20 μm or less, more preferably 10 μm or less, even more preferably 5 μm or less. Such a protective layer can, for example, provide a sufficient protective function to the laminated sheet. The thickness of the protective layer is, for example, 0.1 μm or more and 20 μm or less.

[0042] The protective layer can be formed, for example, by applying a coating liquid containing the above-mentioned materials to a base layer or the like by a known means such as roll coating, reverse roll coating, gravure coating, reverse gravure coating, bar coating, or rod coating, and then drying the applied coating.

[0043] The protective layer can be formed, for example, by preparing a thermal transfer sheet having a protective layer, superimposing the thermal transfer sheet on a base film or the like corresponding to the base layer, and transferring the protective layer onto the base film or a receiving layer on which an image is formed by a thermal transfer process.

[0044] (Receptive layer) The laminate sheet of the present disclosure may include a receiving layer. The laminate sheet of the present disclosure may include, for example, a release sheet, an adhesive layer, a substrate layer, and a receiving layer on which an image is formed, in this order. The receiving layer is a layer for receiving dyes and the like transferred from a thermal transfer sheet. For example, when forming an image using a printer, it is desirable to provide a receiving layer on the substrate layer. The image may be, for example, an image for matching the color tone of the laminate sheet to a desired color, such as skin color.

[0045] The material constituting the receiving layer may be, for example, a resin material. Examples of the resin material include polyolefin, vinyl resin, styrene resin, acrylic resin, polyester, polyamide, polyimide, polyurethane, polycarbonate, cellulose resin, and ionomer resin. Examples of the polyolefin include polyethylene and polypropylene. Examples of the vinyl resin include polyvinyl chloride, polyvinyl acetate, and vinyl chloride-vinyl acetate copolymer. Examples of the polyester include polyethylene terephthalate and polyethylene naphthalate. The resin material constituting the receiving layer is preferably a vinyl resin, and more preferably a vinyl chloride-vinyl acetate copolymer.

[0046] The content of the resin material in the receiving layer is preferably 70% by mass or more, and more preferably 80% by mass or more, based on the total mass of the receiving layer, which can provide, for example, sufficient durability to the receiving layer.

[0047] The receiving layer may contain additives, such as ultraviolet absorbers, light stabilizers, antioxidants, colorants, fillers, and release agents.

[0048] The content of the additive in the receiving layer is preferably 1% by mass or more, more preferably 2% by mass or more, and preferably 30% by mass or less, more preferably 20% by mass or less, based on the total mass of the receiving layer. The content of the additive in the receiving layer is, for example, 1% by mass or more and 30% by mass or less.

[0049] The receiving layer may be a white receiving layer. The white receiving layer may, for example, include a primer layer containing a white pigment and a transparent receiving layer in this order. Examples of the white pigment include silica, titanium oxide, titanium dioxide, zinc oxide, cerium oxide, titanium mica, white mica, white carbon, calcium carbonate, barium sulfate, alumina white, and talc. By using the white receiving layer, it is possible to suppress reflected light from the discolored part of the adherend, increase the concealment of the discolored part, and improve the reproducibility of the desired skin color. The transparent receiving layer may contain particles that scatter light.

[0050] A concealing layer may be further provided on the primer layer containing the white pigment. The concealing layer may contain a metal pigment. Examples of the metal pigment include aluminum, nickel, chromium, brass, tin, brass, bronze, zinc, silver, platinum, gold, and oxides thereof, as well as particles of glass and the like that have been subjected to metal deposition. Among these, aluminum pigments are preferred from the viewpoint of transferability and glossiness of the concealing layer. The aluminum pigment may be of leafing type or non-leafing type, but non-leafing type is preferred from the viewpoint of transferability and glossiness of the concealing layer.

[0051] The thickness of the receiving layer is preferably 0.5 μm or more, more preferably 1 μm or more, and is preferably 20 μm or less, more preferably 10 μm or less. This can improve the density of the thermal transfer image formed on the receiving layer, for example. The thickness of the receiving layer is, for example, 0.5 μm or more and 20 μm or less.

[0052] The receiving layer can be formed, for example, by applying a coating liquid containing the above-mentioned materials to a base layer or the like by a known means such as roll coating, reverse roll coating, gravure coating, reverse gravure coating, bar coating, or rod coating, and then drying the applied coating.

[0053] When a receiving layer is provided on a substrate layer, the substrate layer may be melted and damaged, denatured, or deformed by the solvent contained in the coating liquid during the process of applying and drying the coating liquid for the receiving layer on the substrate layer. In this case, it is preferable to transfer the receiving layer onto the substrate layer by thermal transfer. The receiving layer may be provided on the substrate layer in advance, or may be provided by thermal transfer onto the substrate layer during image formation.

[0054] <Protective sheet> The laminated sheet of the present disclosure may include a protective sheet releasably provided on the base layer. Examples of the protective sheet include a low-density polyethylene (LDPE) sheet and a polypropylene (PP) sheet. The protective sheet is provided with, for example, a weak adhesive layer. An acrylic weak adhesive and a urethane weak adhesive can be used to form the weak adhesive layer. The thickness of the protective sheet is, for example, not less than 10 μm and not more than 200 μm.

[0055] <Laminated sheet> In the laminate sheet of the present disclosure, the ratio (T1 / T2) of the thickness (T1) of the adhesive layer to the thickness (T2) of the base layer is 0.50 or less.

[0056] By making the thickness ratio (T1 / T2) of the adhesive layer to the base layer 0.50 or less, i.e., making the thickness (T2) of the base layer 2 times or more the thickness (T2) of the adhesive layer, the adhesive layer is prevented from touching the conveying roller when the laminated sheet is inserted into the printer, and thus the laminated sheet can be inserted into the printer without curling between the release sheet and the adhesive layer.

[0057] The ratio (T1 / T2) is preferably 0.40 or less, more preferably 0.20 or less, so that when the laminate sheet is inserted into the printer, the peeling between the release sheet and the adhesive layer does not occur, and the laminate sheet can be easily inserted into the printer.

[0058] The laminate sheet of the present disclosure preferably has an insertion resistance of 120 gf or less when a laminate sheet cut into a 10 cm square is inserted into a printer. The insertion resistance value is the resistance value measured when inserting the printer into a thermal transfer printer (DP-QW410, manufactured by Dai Nippon Printing Co., Ltd.) using a commercially available push-pull gauge (for example, model "FS-1K", manufactured by Imada Co., Ltd.).

[0059] If the insertion resistance is 120 gf or less, the laminate sheet can be easily inserted into the printer without curling between the release sheet and the adhesive layer when the laminate sheet is inserted into the printer. The insertion resistance is more preferably 75 gf or less, and even more preferably 50 gf or less.

[0060] The laminate sheet of the present disclosure preferably has a dynamic friction coefficient between the ABS resin and the laminate sheet of 0.4 or less, measured in accordance with the method described in JIS K7125:1999.

[0061] If the dynamic friction coefficient is 0.4 or less, when the laminate sheet is inserted into the printer, a large frictional force is not generated between the laminate sheet and the ABS resin of the transport roller, which prevents curling between the release sheet and the adhesive layer, making it easier to insert the laminate sheet into the printer.

[0062] The total thickness of the laminate sheet of the present disclosure is preferably 100 μm or more, more preferably 135 μm or more, and preferably 350 μm or less, more preferably 300 μm or less. The total thickness of the laminate sheet is, for example, 100 μm or more and 350 μm or less. If the total thickness of the laminate sheet is within the above range, it is easy to satisfy the above-mentioned requirements when inserted into a thermal transfer printer.

[0063] [Applications of laminated sheets] An example of the use of the laminate sheet of the present disclosure will now be described. In one embodiment, the laminate sheet can be used as a skin design sheet (skin sheet) to be attached to the skin by forming an image. Examples of the skin design sheet include a skin concealing sheet and a tattoo sticker.

[0064] In one embodiment, a skin design sheet can be produced from the laminated sheet. For example, a plurality of skin design sheets may be produced from the laminated sheet. For example, a roll-shaped laminated sheet may be cut to produce a sheet-shaped laminated sheet in the product form.

[0065] The skin design sheet can be applied to skin having spots, birthmarks, freckles, wrinkles, sagging skin, pores, scars, acne scars, burn scars, discoloration due to skin diseases, etc., with the adhesive layer in contact with the skin, thereby hiding these and making them less noticeable.

[0066] In addition, by producing a skin design sheet on the laminated sheet by on-demand printing from a photographed image of the user, the color of the skin design sheet can be matched to the skin color of the user. This reduces the discomfort felt when the skin design sheet is applied to the user's skin.

[0067] [Manufacturing method of skin design sheet] The skin design sheet of the present disclosure can be produced, for example, by a thermal transfer process. A long base film corresponding to the laminate sheet of the present disclosure is prepared. The base film may have an adhesive layer and a release sheet. The base film and the thermal transfer sheet are set in a thermal transfer printer.

[0068] The thermal transfer sheet comprises a substrate, a transfer type receiving layer, a dye layer and an optional protective layer, which are provided in face order on one side of the substrate. The receiving layer is a layer that receives the dye transferred from the thermal transfer sheet, and is transparent. Examples of the dye layer include a yellow dye layer, a magenta dye layer and a cyan dye layer. The dye layer contains a binder resin and a sublimation dye. Known materials can be used for the yellow dye layer, the magenta dye layer and the cyan dye layer. Details of the receiving layer and the protective layer are as described above. If a receiving layer is provided on the substrate film in advance, it is not necessary for the thermal transfer sheet to have a receiving layer, and it is not necessary to transfer the receiving layer as described below.

[0069] The thermal transfer printer has a thermal head and a platen roll that sandwich the base film and the thermal transfer sheet, and heats the thermal transfer sheet. The thermal head heats the receptor layer of the transfer mold to transfer the receptor layer onto the base film. Next, the thermal head sequentially heats the yellow dye layer, the magenta dye layer, and the cyan dye layer based on, for example, the data of the skin design sheet, and transfers the dye to the receptor layer transferred onto the base film to form an image. This makes it easy to match the color of the laminated sheet to the color of the user's skin. If necessary, the protective layer of the thermal transfer sheet is then heated and transferred onto the receptor layer on which the image has been formed.

[0070] If necessary, the surface of the base film may be subjected to a shaping process such as embossing to form a concave-convex shape. In the embossing process, for example, an embossing plate or a shaping sheet can be used. The embossing plate and the shaping sheet can be used without any particular restrictions. The surface shape of the embossing plate and the shaping sheet and the surface shape shaped by them are almost the opposite shapes.

[0071] The long laminate sheet is cut parallel to the width direction of the laminate sheet by a cutter in a thermal transfer printer to obtain a single laminate sheet. A protective sheet may be attached to the surface resin layer of the single laminate sheet, if necessary.

[0072] Next, the laminated sheet is cut into a shape of the product form of the skin design sheet using a known cutting device. For example, the laminated sheet is punched into a circular shape when viewed from above. The shape is not particularly limited.

[0073] In this manner, a skin design sheet having a desired shape can be produced. In the above method, the adhesive layer may be provided on the substrate film after the thermal transfer process. In this case, it is preferable to provide a release sheet after the adhesive layer is formed.

[0074] Although the method for producing a skin design sheet by a thermal transfer process has been described, the method for producing the skin design sheet of the present disclosure is not limited to the above method. For example, the skin design sheet may be produced by sequentially forming each layer of a laminated sheet.

[0075] In addition, in the manufacturing method of the skin design sheet of the present disclosure, an embodiment using a thermal transfer printer (thermal printer) has been described, but the present invention is not limited to this. The printer may be a thermal transfer printer, an inkjet printer, etc. Among these, a thermal transfer printer is preferable. As the thermal transfer printer, a dye-sublimation type thermal transfer printer, which has excellent color reproducibility and gradation, is preferable.

[0076] The present disclosure relates to, for example, the following [1] to [9]. [1] A release sheet, an adhesive layer, and a base layer, in this order; A laminate sheet, wherein the ratio (T1 / T2) of the thickness (T1) of the adhesive layer to the thickness (T2) of the base layer is 0.50 or less. [2] The laminate sheet according to [1], wherein the ratio (T1 / T2) is 0.40 or less. [3] The laminate sheet according to [1] or [2], wherein the thickness (T2) of the base layer is 30 to 115 μm. [4] The laminate sheet according to any one of [1] to [3], wherein the base layer is a resin film formed from polyurethane. [5] The laminate sheet according to any one of [1] to [4], wherein the insertion resistance when the laminate sheet is cut into a 10 cm square and inserted into a printer is 120 gf or less. [6] A laminate sheet according to any one of [1] to [5], in which the coefficient of dynamic friction between the ABS resin and the laminate sheet, measured in accordance with the method described in JIS K7125:1999, is 0.4 or less. [7] The laminate sheet according to any one of [1] to [6], wherein the peel strength of the release sheet between the release sheet and the adhesive layer is 120 mN / 20 mm or more. [8] The laminate sheet according to any one of [1] to [7], further comprising a receiving layer. [9] A skin design sheet including a laminated sheet on which an image is formed, The laminate sheet is A release sheet, an adhesive layer, and a base layer are provided in this order, A skin design sheet, wherein the ratio (T1 / T2) of the thickness (T1) of the adhesive layer to the thickness (T2) of the base layer is 0.50 or less.

[10] A method for producing a skin design sheet, comprising inserting the laminate sheet according to any one of [1] to [8] and a transfer sheet into a printer to form an image on the laminate sheet. EXAMPLES

[0077] The laminate sheet of the present disclosure will be described in more detail with reference to examples, but the laminate sheet of the present disclosure is not limited to these examples.

[0078] [Example 1] An adhesive composition having the following composition was applied as an adhesive onto a release sheet (Toyobo Co., Ltd., K1212, thickness 100 μm) and dried to form an adhesive layer having a thickness of 9 μm. A polyethylene terephthalate film having a thickness of 100 μm (Toray Co., Ltd., Lumirror #100-S10, transparent substrate) was attached to the adhesive layer. In this manner, a laminated sheet (total thickness 209 μm) including a release sheet, an adhesive layer, and a substrate was produced.

[0079] (Adhesive composition) Acrylic copolymer 15 parts (SK Dyne 1251, Soken Chemical Industries, Ltd.) Hardener 0.33 parts (L-45, Soken Chemical Co., Ltd.) Hardener 0.1 parts (E-AX, Soken Chemical Co., Ltd.) Ethyl acetate 8 parts

[0080] [Example 2] An acrylic adhesive was applied onto a release sheet (Sumika Kako Co., Ltd., double-sided polylaminated wood-free paper #166, thickness 166 μm) and dried to form an adhesive layer 35 μm thick. A polyethylene terephthalate film 115 μm thick (Toray Industries, Inc., Lumirror #125-E20, white substrate) was attached to the adhesive layer. In this way, a laminated sheet (total thickness 316 μm) comprising a release sheet, adhesive layer and substrate was produced.

[0081] [Example 3] An acrylic adhesive was applied onto a release sheet (Sumika Kako Co., Ltd., double-sided polylaminated wood-free paper #166, thickness 160 μm) and dried to form an adhesive layer 9 μm thick. A 70 μm thick polyvinyl chloride film (Lonseal Corporation, FV3-RW-TR-70, substrate) was attached to the adhesive layer. In this way, a laminated sheet (total thickness 239 μm) comprising a release sheet, adhesive layer and substrate was produced.

[0082] [Example 4] The adhesive composition used in Example 1 was applied as an adhesive onto a release sheet (TOYOBO Co., Ltd., K1212, thickness 100 μm) and dried to form an adhesive layer with a thickness of 20 μm. Also, the receiving layer coating liquid having the above composition was applied onto a urethane film with a thickness of 50 μm (OHKURA INDUSTRIES Co., Ltd., NES85, elastic substrate) and dried to form a receiving layer with a thickness of 4 μm. Next, the release sheet and the urethane film were bonded together via the adhesive layer. In this way, a laminated sheet (total thickness 174 μm) including a release sheet, an adhesive layer, a substrate, and a receiving layer was produced.

[0083] [Example 5] An acrylic adhesive (Soken Chemical, MD-1) was applied onto a release sheet (Sumika Kako Co., Ltd., double-sided polylaminated wood-free paper #166, thickness 100 μm) and dried to form an adhesive layer 15 μm thick. A receiving layer coating liquid having the following composition was applied onto a 50 μm thick urethane film (Okura Kogyo Co., Ltd., NES85, elastic substrate) and dried to form a receiving layer 4 μm thick. The release sheet and urethane film were then bonded together via the adhesive layer. In this manner, a laminated sheet (total thickness 169 μm) comprising a release sheet, adhesive layer, substrate and receiving layer was produced.

[0084] (Coating solution for receiving layer) 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.) Methyl ethyl ketone 40 parts Toluene 40 parts

[0085] [Example 6] A laminated sheet (total thickness 179 μm) including a release sheet, an adhesive layer, a substrate and a receiving layer was produced in the same manner as in Example 5, except that an adhesive layer having a thickness of 25 μm was formed.

[0086] [Example 7] An acrylic adhesive (Soken Chemical, MD-1) was applied onto a release sheet (Sumika Kako Co., Ltd., double-sided polylaminated wood-free paper #166, thickness 100 μm) and dried to form an adhesive layer with a thickness of 5 μm. Also, a receiving layer coating liquid with the above composition was applied onto a urethane film with a thickness of 30 μm (Okura Kogyo Co., Ltd., NES85, elastic substrate) and dried to form a receiving layer with a thickness of 4 μm. Next, the release sheet and the urethane film were bonded together via the adhesive layer. In this way, a laminated sheet (total thickness 139 μm) comprising a release sheet, adhesive layer, substrate and receiving layer was produced.

[0087] [Example 8] A laminated sheet (total thickness 149 μm) including a release sheet, an adhesive layer, a substrate and a receiving layer was produced in the same manner as in Example 7, except that an adhesive layer having a thickness of 15 μm was formed.

[0088] [Comparative Example 1] In Example 4, a laminated sheet (total thickness 268 μm) comprising a release sheet, an adhesive layer and a substrate was prepared in the same manner as in Example 4, except that an acrylic adhesive (Cosmede Pharmaceutical Co., Ltd., HIPSA10) was applied and dried to form an adhesive layer with a thickness of 40 μm.

[0089] [Comparative Example 2] The adhesive composition used in Example 1 was applied as an adhesive onto a release sheet (TOYOBO Co., Ltd., K1212, thickness 100 μm) and dried to form an adhesive layer with a thickness of 9 μm. A urethane film with a thickness of 10 μm (OHKURA INDUSTRIES CO., LTD., NES85, elastic substrate) was attached to the adhesive layer. In this manner, a laminated sheet (total thickness 119 μm) including a release sheet, an adhesive layer, and a substrate was produced.

[0090] [Comparative Example 3] A silicone adhesive (Wacker Asahi Kasei Silicone, SILPURAN 2130) was applied onto a release sheet (Sumika Kako Co., Ltd., double-sided polylaminated wood-free paper #166, thickness 100 μm) and dried to form an adhesive layer 20 μm thick. A 10 μm thick urethane film (Okura Kogyo Co., Ltd., NES85, elastic substrate) was attached to the adhesive layer. In this way, a laminated sheet (total thickness 130 μm) comprising a release sheet, adhesive layer and substrate was produced.

[0091] [Comparative Example 4] The adhesive composition used in Example 1 was applied as an adhesive onto a release sheet (TOYOBO Co., Ltd., K1212, thickness 100 μm) and dried to form an adhesive layer with a thickness of 10 μm. An 8 μm-thick urethane film (OHKURA INDUSTRIES Co., Ltd., NES85, elastic substrate) was attached to the adhesive layer. In this manner, a laminated sheet (total thickness 128 μm) including a release sheet, an adhesive layer, and a substrate was produced.

[0092] <Thickness ratio> For each laminate sheet, the ratio (T1 / T2) of the thickness (T1) of the adhesive layer to the thickness (T2) of the base layer is shown in Table 1 below.

[0093] <Insertion resistance> A dye-sublimation digital photo printer "DP-QW410" (manufactured by Dai Nippon Printing Co., Ltd.) was used to measure the insertion resistance force when inserting a laminated sheet cut to a 10 cm square using a push-pull gauge (IMADA Co., Ltd., FS-1K).

[0094] A method for measuring the insertion resistance will be specifically described with reference to Fig. 2. Fig. 2 is a schematic cross-sectional view of a sheet insertion section of a printer for explaining a method for measuring the insertion resistance. As shown in Fig. 2, the printer insertion section 60 includes a resin transport guide 61 and a sheet leading edge detection sensor 62 located near the insertion opening of the transport guide 61.

[0095] To measure the insertion resistance, first, the leading end of the laminated sheet 40 is inserted into the insertion opening of the conveying guide 61 of the printer insertion section 60 with the release surface 40a on top and the image receiving surface 40b on the bottom. Next, the push-pull gauge 50 is used to push the rear end of the laminated sheet 40 toward the rear along the conveying guide 61, and the maximum insertion resistance force until the leading end of the laminated sheet 40 reaches the sheet leading end detection sensor 62 is measured. This is repeated five times and the average value is recorded as the insertion resistance.

[0096] Here, if the sheets are made of the same material, the thicker the sheet, the greater the insertion resistance, since the bending deformation force acts as a frictional resistance with the transport guide. If the sheets are made of the same thickness, the greater the friction coefficient between the resin on the image receiving surface side and the resin of the transport guide, the greater the frictional resistance, and therefore the greater the insertion resistance. Furthermore, if the urethane sheet is turned over due to the insertion resistance and the adhesive surface adheres to the guide sheet, the insertion resistance will become even greater. If the insertion resistance force becomes greater than the buckling stress of the sheet, the sheet will bend and block the conveying guide.

[0097] <Kinematic friction coefficient> The coefficient of dynamic friction between the ABS resin and the laminated sheet was measured using a friction tester HEIDON in accordance with the method described in JIS K7125:1999. The ABS resin used was the same as that used for the guide roller provided at the insertion port of a dye-sublimation digital photo printer "DP-QW410" (manufactured by Dai Nippon Printing Co., Ltd.).

[0098] <Release strength of release sheet> The peel strength between the release sheet and the adhesive layer was measured using Shimadzu's "EZ-TEST." The peel strength was measured in accordance with the method (90° peel) described in JIS Z 0237:2009.

[0099] <Printing suitability> Using a dye-sublimation digital photo printer "DP-QW410" (manufactured by Dai Nippon Printing Co., Ltd.), the laminated sheet was inserted and the presence or absence of peeling (peeling) of the adhesive layer and base material from the release sheet was confirmed. A: The above-mentioned curling of the laminated sheet is not observed inside the printer. B: The above-mentioned curling of the laminated sheet is slightly observed inside the printer. C: The above-mentioned curling of the laminated sheet was observed inside the printer. D: The laminate sheet is curled up inside the printer.

[0100] <Ease of handling> When peeling the release sheet from the laminated sheet, the handleability (ease of application) was evaluated by determining whether the release sheet could be peeled off without twisting the base material (seal paper). A: It is easy to apply. B: It's a bit difficult. C: I can somehow paste it. D: It can't be attached.

[0101] [Table 1] [Explanation of symbols]

[0102] 1 Laminated sheet 10 Release sheet 20 Adhesive layer 30 Base material layer

Claims

1. A release sheet, an adhesive layer, and a base layer are provided in this order, A laminate sheet, wherein the ratio (T1 / T2) of the thickness (T1) of the adhesive layer to the thickness (T2) of the base layer is 0.50 or less.

2. The laminated sheet according to claim 1 , wherein the ratio (T1 / T2) is 0.40 or less.

3. The laminate sheet according to claim 1, wherein the thickness (T2) of the base layer is 30 to 115 μm.

4. The laminate sheet according to claim 1 , wherein the base layer is a resin film formed from polyurethane.

5. 2. The laminate sheet according to claim 1, wherein an insertion resistance when the laminate sheet cut into a 10 cm square is inserted into a printer is 120 gf or less.

6. 2. The laminate sheet according to claim 1, wherein the coefficient of dynamic friction between the ABS resin and the laminate sheet, measured in accordance with the method described in JIS K7125:1999, is 0.4 or less.

7. The laminate sheet according to claim 1 , wherein the peel strength of the release sheet between the release sheet and the adhesive layer is 120 mN / 20 mm or more.

8. The laminate sheet of claim 1 further comprising a receiving layer.

9. A skin design sheet including a laminated sheet on which an image is formed, The laminate sheet is A release sheet, an adhesive layer, and a base layer are provided in this order, The skin design sheet, wherein the ratio (T1 / T2) of the thickness (T1) of the adhesive layer to the thickness (T2) of the base layer is 0.50 or less.

10. A method for producing a skin design sheet, comprising inserting the laminate sheet according to any one of claims 1 to 8 and a transfer sheet into a printer to form an image on the laminate sheet.

Images