Printed matter, manufacturing method of printed matter, and method for determining authenticity

Abstract

To provide printed material that is hard to be counterfeited and allows easy authenticity determination thereof, and a manufacturing method and an authenticity determination method of the printed material.SOLUTION: The printed material includes: a substrate; a receiving layer that is provided on one surface of the substrate and has an image formed thereon; a first protection layer that is provided on the receiving layer in a predetermined pattern; and a second protection layer that is provided on a different area from the first protection layer on the receiving layer. The adhesive force between the first protection layer and the receiving layer is greater than the adhesive force between the second protection layer and the receiving layer.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a printed matter, a method for manufacturing a printed matter, and a method for determining authenticity. [Background technology]

[0002] Conventionally, anti-counterfeiting technologies have been applied to various printed materials such as ID cards, securities, tickets, and coupons. For example, a technology is known that makes it possible to see latent images by irradiating ultraviolet or infrared light on printed materials that cannot be seen by the naked eye under normal circumstances. In addition, a technology has been proposed that makes it possible to make latent images discernible in copies of printed materials. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 3544536 Summary of the Invention [Problem to be solved by the invention]

[0004] An object of the present disclosure is to provide a printed matter that is difficult to counterfeit and easy to determine its authenticity, a method for manufacturing a printed matter, and a method for determining its authenticity. [Means for solving the problem]

[0005] The print according to the present disclosure comprises a substrate, a receiving layer provided on one side of the substrate and having an image formed thereon, a first protective layer provided in a predetermined pattern on the receiving layer, and a second protective layer provided in an area on the receiving layer different from the first protective layer, wherein the adhesive strength between the first protective layer and the receiving layer is greater than the adhesive strength between the second protective layer and the receiving layer.

[0006] A method for manufacturing a printed matter according to the present disclosure includes a step of transferring a first protective layer in a predetermined pattern to one side of a receiving body having an image formed on the one side, and a step of transferring a second protective layer to at least a portion of an area of ​​the one side of the receiving body to which the first protective layer has not been transferred, wherein the adhesive strength between the first protective layer and the receiving body is different from the adhesive strength between the second protective layer and the receiving body.

[0007] The authenticity determination method according to the present disclosure includes a first irradiation step of irradiating the printed matter of the present disclosure with invisible light, a step of attaching adhesive tape to the printed matter after the first irradiation step, a step of peeling off the adhesive tape from the printed matter, a second irradiation step of irradiating the printed matter with the invisible light after the adhesive tape has been peeled off, and a step of comparing a pattern confirmed in the first irradiation step with a pattern confirmed in the second irradiation step to determine the authenticity of the printed matter. Effect of the Invention

[0008] The printed matter of the present disclosure is difficult to counterfeit and easy to determine its authenticity. [Brief description of the drawings]

[0009] [Figure 1] 1a to 1c are cross-sectional views of a thermal transfer sheet according to an embodiment of the present disclosure. [Diagram 2] 2a and 2b are cross-sectional views illustrating the steps of a method for producing a print. [Diagram 3] FIG. [Figure 4] FIG. 4a is a cross-sectional view of the print with the protective layer removed, and FIG. 4b is a plan view of the print with the protective layer removed. [Diagram 5] FIG. 2 is a cross-sectional view of a print from which a protective layer has been peeled off. [Figure 6] 6a and 6b are diagrams showing transfer patterns of the first and second protective layers. [Figure 7] 7a to 7c are diagrams showing transfer patterns of the first protective layer and the second protective layer. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, an embodiment of the present disclosure will be described with reference to the drawings.

[0011] In this embodiment, a print is produced by transferring two types of protective layers to a transfer target. For example, as shown in Fig. 1a, a thermal transfer sheet 10A for transferring a first protective layer 1 and a thermal transfer sheet 10B for transferring a second protective layer 2 are used.

[0012] Thermal transfer sheet 10A has a substrate 3 and a first protective layer 1 provided on the substrate 3. Thermal transfer sheet 10B has a substrate 3 and a first protective layer 2 provided on the substrate 3. Thermal transfer sheets 10A and 10B may further include a back layer 4 on the surface of substrate 3 opposite to the surface on which the protective layer is provided.

[0013] As shown in FIG. 1b, a thermal transfer sheet 10C may be formed in which a first protective layer 1 and a second protective layer 2 are provided in surface order on the same substrate 3.

[0014] As shown in FIG. 1c, a thermal transfer sheet 10D may be formed in which a first protective layer 1, a second protective layer 2 and a color material layer 5 are provided on a substrate 3 in surface order.

[0015] The first protective layer 1 and the second protective layer 2 contain an invisible light absorbing material. The invisible light absorbing material is a fluorescent whitening agent, an ultraviolet absorbing material, an infrared absorbing material, etc. The invisible light absorbing materials contained in the first protective layer 1 and the second protective layer 2 may be different types or the same type.

[0016] 2a, a transfer recipient 20 is prepared, in which a receiving layer 22 is provided on a substrate 21. An image is formed on the receiving layer 22. When using a thermal transfer sheet 10C, a colorant is transferred from the colorant layer 5 to the receiving layer 22 to form an image.

[0017] The first protective layer 1 is transferred in a predetermined pattern from the thermal transfer sheet 10A, 10C, or 10D onto the receiving layer 22 of the transfer recipient 20.

[0018] Next, as shown in Fig. 2b, the second protective layer 2 is transferred in a predetermined pattern from the thermal transfer sheet 10B, 10C, or 10D onto the receiving layer 22 of the transfer recipient 20 to produce a print. The second protective layer 2 is transferred to at least a part of the area where the first protective layer 1 is not transferred. Fig. 3 shows an example where the first protective layer 1 and the second protective layer 2 are transferred so as to be alternately arranged.

[0019] In this embodiment, the adhesive force (adhesion) between the first protective layer 1 and the transferred body 20 (receiving layer 22) is greater than the adhesive force between the second protective layer 2 and the transferred body 20 (receiving layer 22).

[0020] In other words, in this print, the peeling force required to peel the second protective layer 2 from the receiving layer 22 is smaller (lighter) than the peeling force required to peel the first protective layer 1 from the receiving layer 22.

[0021] Therefore, when attempting to peel or remove the protective layer from the printed matter, as shown in Figures 4a and 4b, the second protective layer 2 is peeled off from the receiving layer 22, while the first protective layer 1 remains adhered to the receiving layer 22.

[0022] When counterfeiting a printed matter, the protective layer is peeled off and a new image is formed on the receiving layer 22. However, in this embodiment, only the second protective layer 2 is peeled off and the first protective layer 1 remains, making it difficult to form a new image.

[0023] Furthermore, as shown in Figure 4b, it is possible to form a new image only in the area where the second protective layer 2 has been peeled off and the surface of the receiving layer 22 is exposed. However, since the removal of the second protective layer 2 means that the pattern that can be confirmed when invisible light is irradiated onto the printed matter differs from the original pattern, it is easy to detect that the printed matter is a counterfeit.

[0024] When adhesive tape is applied to a printed matter and then peeled off, only the second protective layer 2 peels off, leaving the first protective layer 1, so that by comparing the pattern confirmed by irradiating the printed matter with invisible light before the adhesive tape is applied with the pattern confirmed by irradiating the printed matter with invisible light after the adhesive tape is applied and peeled off, if the pattern changes, it may be determined that the printed matter had the second protective layer 2, i.e., the printed matter was genuine. On the other hand, if the pattern confirmed by irradiating invisible light does not change, it is determined that the second protective layer 2 was not provided, i.e., the printed matter was forged with the second protective layer 2 peeled off.

[0025] Only the second protective layer 2, which is more easily peeled off than the first protective layer 1, may contain an invisible light absorbing material.

[0026] A counterfeiter may use a strong adhesive tape to peel off not only the second protective layer 2 but also the first protective layer 1, as shown in Fig. 5. In the area where the first protective layer 1, which has a strong adhesive force with the receiving layer 22, has been peeled off, the receiving layer 22 is also partially peeled off together with the first protective layer 1, and the surface of the receiving layer 22 becomes a complex uneven shape, destroying the image formed on the receiving layer 22. It is difficult to form a new image on the receiving layer 22 with such a surface state, and this can enhance the anti-counterfeiting effect.

[0027] The transfer patterns of the first protective layer 1 and the second protective layer 2 are not limited to those shown in Fig. 3. For example, as shown in Fig. 6a, the first protective layer 1 may be transferred to the peripheral portion of the transfer target, and the second protective layer 2 may be transferred to the center portion inside the peripheral portion. In this case, a counterfeiter may easily mistakenly believe that the protective layer has been peeled off from the entire surface of the printed matter by peeling off the second protective layer 2. Since the first protective layer 1 remains on the peripheral portion of the counterfeit printed matter, the pattern confirmed by irradiating it with invisible light indicates that it is a counterfeit.

[0028] As shown in Fig. 6b, the second protective layer 2 may be transferred to the peripheral portion of the transfer target object, and the first protective layer 1 may be transferred to the center portion inside the peripheral portion. In this case, when attempting to peel the protective layer from the printed matter, the second protective layer 2 is peeled off in a frame shape, and the first protective layer 1 in the center portion remains. Since the first protective layer 1 is located away from the edge of the printed matter, it is difficult to peel off, and this can enhance the anti-counterfeiting effect.

[0029] When the printed matter is an ID card or the like, as shown in Fig. 7a, the first protective layer 1 is transferred to an area R1 where the name, address, expiration date, etc. are printed, and the second protective layer 2 is transferred to the other areas. As shown in Fig. 7b, the first protective layer 1 may be transferred to an area R2 where a face image is printed. Alternatively, as shown in Fig. 7c, the first protective layer 1 may be transferred to areas R1 and R2.

[0030] In this way, by transferring the first protective layer 1 to an area related to personal information, when the first protective layer 1 is peeled off, the receptive layer in that area is destroyed in a focused manner, making counterfeiting difficult.

[0031] Each layer of the thermal transfer sheet will be described below.

[0032] (base material) The substrate 3 can be any substrate without particular restrictions as long as it has heat resistance sufficient to withstand the thermal energy applied during thermal transfer (e.g., heat from a thermal head) and mechanical strength and solvent resistance sufficient to support a protective layer or the like formed on the substrate.

[0033] Examples of the substrate include polyesters such as polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyethylene naphthalate (PEN), 1,4-polycyclohexylene dimethylene terephthalate, and terephthalic acid-cyclohexanedimethanol-ethylene glycol copolymers; polyamides such as nylon 6 and nylon 6,6; polyolefins such as polyethylene (PE), polypropylene (PP), and polymethylpentene; polyvinyl chloride, polyvinyl alcohol (PVA), polyvinyl acetate, vinyl chloride-vinyl acetate copolymers, and polyvinyl butyrate. Films (hereinafter simply referred to as "resin films") made of vinyl resins such as polyvinylpyrrolidone (PVP), (meth)acrylic resins such as polyacrylate, polymethacrylate, and polymethyl methacrylate, imide resins such as polyimide and polyetherimide, cellulose resins such as cellophane, cellulose acetate, nitrocellulose, cellulose acetate propionate (CAP), and cellulose acetate butyrate (CAB), styrene resins such as polystyrene (PS), polycarbonate, and ionomer resins can be used.

[0034] The thickness of the substrate is not particularly limited, but is, for example, from 2 μm to 25 μm.

[0035] (protective layer) The first protective layer 1 and the second protective layer 2 are made of a thermoplastic resin to which a fluorescent whitening agent, an ultraviolet absorbing material, or an infrared absorbing material has been added.

[0036] Examples of the thermoplastic resin for the first protective layer include polyester, vinyl chloride-vinyl acetate copolymer, etc. The content of the thermoplastic resin in the first protective layer is preferably 40% by mass or more and 80% by mass or less.

[0037] Examples of the thermoplastic resin of the second protective layer include vinyl acetal resins such as polyvinyl acetoacetal and polyvinyl butyral, (meth)acrylic resins such as poly(meth)acrylate, cellulose resins such as cellulose acetate, nitrocellulose, cellulose acetate propionate and cellulose acetate butyrate, polyolefins such as polyethylene and polypropylene, etc. The content of the thermoplastic resin in the second protective layer is preferably 40% by mass or more and 80% by mass or less.

[0038] Examples of the fluorescent brightening agent that can be used include fluorescein compounds, thioflavin compounds, eosin compounds, rhodamine compounds, coumarin compounds, imidazole compounds, oxazole compounds, triazole compounds, carbazole compounds, pyridine compounds, imidazolone compounds, naphthalic acid derivatives, stilbene disulfonic acid derivatives, stilbene tetrasulfonic acid derivatives, and stilbene hexasulfonic acid derivatives.

[0039] Examples of ultraviolet absorbing materials include organic ultraviolet absorbing materials such as benzotriazole-based compounds, triazine-based compounds, benzophenone-based compounds, and benzoate-based compounds, and inorganic ultraviolet absorbing materials such as titanium oxide, zinc oxide, cerium oxide, iron oxide, and barium sulfate.

[0040] Examples of infrared absorbing materials include diimonium-based compounds, aminium-based compounds, phthalocyanine-based compounds, dithiol-based organometallic complexes, cyanine-based compounds, azo-based compounds, polymethine-based compounds, quinone-based compounds, diphenylmethane-based compounds, triphenylmethane-based compounds, and oxol-based compounds.

[0041] The first and second protective layers preferably have approximately the same thickness, for example, from 1 μm to 6 μm.

[0042] (back layer) The back layer 4 prevents thermal fusion between the thermal head of the thermal transfer printer and the thermal transfer sheets 10A to 10D, and allows smooth running. The back layer may contain a binder resin, examples of which include cellulose resin, vinyl resin, polyester, polyurethane, fluorine-modified polyurethane, and acrylic resin.

[0043] (color material layer) The color material layer 5 contains a colorant and a binder resin. The colorant may be appropriately selected from carbon black, inorganic pigments, organic pigments, and dyes depending on the required color tone.

[0044] Examples of the binder resin include polyester, polyamide, polyolefin, vinyl resin, (meth)acrylic resin, imide resin, cellulose resin, styrene resin, polyol resin, polycarbonate, and ionomer resin.

[0045] The present disclosure is not limited to the above-described embodiment as it is, and in the implementation stage, the components can be modified and embodied without departing from the spirit of the present disclosure. [Explanation of symbols]

[0046] 1 1st protective layer 2 Second protective layer 3 Base material 4 Back layer 5 Color material layer 10A~10D Thermal transfer sheet 20 Transferred object

Claims

1. A substrate; a receiving layer provided on one surface of the substrate and having an image formed thereon; a first protective layer provided in a predetermined pattern on the receiving layer; a second protective layer provided on at least a portion of an area on the receiving layer where the first protective layer is not provided; Equipped with A print, wherein the adhesive strength between the first protective layer and the receiving layer is greater than the adhesive strength between the second protective layer and the receiving layer.

2. The print according to claim 1 , wherein the second protective layer comprises an invisible light absorbing material.

3. transferring a first protective layer in a predetermined pattern onto one surface of a receiving material having an image formed on one surface; transferring a second protective layer to at least a portion of an area of ​​the one surface of the transfer target body where the first protective layer is not transferred; Equipped with A method for producing a print product, wherein an adhesive strength between the first protective layer and the transfer recipient is different from an adhesive strength between the second protective layer and the transfer recipient.

4. A first irradiation step of irradiating the print object according to claim 2 with invisible light; a step of attaching an adhesive tape to the printed matter after the first irradiation step; A step of peeling off the adhesive tape from the printed matter; a second irradiation step of irradiating the print object with the invisible light after the adhesive tape is peeled off; a step of comparing a pattern confirmed in the first irradiation step with a pattern confirmed in the second irradiation step to determine the authenticity of the printed matter; A method for determining authenticity is provided.

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