JP4765201B2 - OVD seal and manufacturing method thereof - Google Patents

Description

【００３７】
＜実施例２＞
まず、厚み２５μｍの透明ポリエチレンテレフタレート（ＰＥＴ）フィルムから成る支持体に剥離層およびホロ層をグラビア法にて各々２０μｍおよび５μｍ塗布し、次いで、ロールエンボス法によりＯＶＤレリーフパターンを形成した後、真空蒸着法を用いて膜厚０．０５μｍのＡｌ蒸着薄膜層（ＯＶＤ効果層）を設けた。その後、部分的にエッチング加工を施し、図４、Ａに示すように中央部にだけＡｌ蒸着が残るように加工した。
【００３８】
次に紫外線効果型粘着剤をコンマコート法にて２０μｍ設け、離型紙をラミネートし、ＯＶＤシールを作製した。さらに、基材面側から半抜き加工・カス取り加工を施し、図４、Ａに示したＯＶＤシールを得た。
【００３９】
[剥離層塗料]
アクリル系樹脂 …２０部
メチルエチルケトン …４０部
トルエン …４０部
【００４０】
［ＯＶＤ形成層塗料]
塩化ビニル−酢酸ビニル共重合体 …１５部
ウレタン樹脂 …１０部
メチルエチルケトン …５０部
トルエン …２５部
【００４１】
[接着層塗料]
アクリレート系紫外線効果型粘着剤 …５０部
メチルエチルケトン …２０部
【００４２】
以上にして得られたＯＶＤシールそれぞれダンボール紙に貼りつけ、基材側から紫外線を照射し、接着剤を硬化せしめた。このように貼り付けられた実施例３のシールを剥がそうとすると図４、Ｂに示したように、接着剤の硬化した部分は剥離層部分で剥がれ、未硬化な部分では接着剤部分で剥がれＯＶＤが破壊した。
剥離剤を用いて剥離を試みた結果を表２に示す。
【００４３】
【表２】

【００４４】
いずれの実施例においても剥離剤を用いてもシールを剥がすことができなかった。
【００４５】
【発明の効果】
このように本発明のＯＶＤシールは剥離剤で壊れにくい硬化タイプの接着剤からなっており、剥離剤を用いて剥がそうとしても剥がれないあるいは剥がれる前にＯＶＤが破壊してしまう。
つまるところ、本発明によれば、例えば市販のラベル剥離剤によって粘着剤を冒して不正行為を行なおうと試みても、それに伴う貼り替えを防ぐなど、貼り替えによる不正行為を許さないことに有効なＯＶＤシールとその製造方法を提供することができた。
【図面の簡単な説明】
【図１】本発明のＯＶＤシール構成の一例を示す断面図。
【図２】Ａ；本発明のＯＶＤシール構成の一例を示す断面図。
Ｂ；Ａに示した本発明のＯＶＤシールを剥離したときに破壊する様子を描いた断面図。
【図３】Ａ；本発明のＯＶＤシール構成の一例を示す断面図。
Ｂ；Ａに示した本発明のＯＶＤシールを剥離したときに破壊する様子を描いた断面図。
【図４】Ａ；本発明のＯＶＤシール構成の一例を示す断面図。
Ｂ；Ａに示した本発明のＯＶＤシールを剥離したときに破壊する様子を描いた断面図。
【符号の説明】
１ ・・基材
２ ・・ＯＶＤ層
２ａ・・ＯＶＤ形成層
２ｂ・・ＯＶＤ効果層
３ ・・接着層
２４・・剥離層[0001]
BACKGROUND OF THE INVENTION
The present invention is an effective technique for preventing replacement, and particularly relates to an OVD seal using an OVD whose color and image change depending on the direction of light including a hologram used for authentication of brand protection in recent years. .
[Prior art]
[0002]
In recent years, optical multilayers that can express stereoscopic images and special decorative images using light interference, and produce a color change (color shift) depending on the viewing angle by overlaying holograms, diffraction gratings, or thin films with different optical properties Development of OVD (abbreviation of Optical Variable Device) represented by a thin film is being promoted in various places.
[0003]
These OVDs have an excellent decorative effect in order to give a unique impression such as a stereoscopic image and color shift, and have been used for general printed materials such as various packaging materials, picture books, catalogs, and the like.
In addition, since this OVD requires advanced manufacturing technology, it is formed and used as a part of or on the entire surface of credit cards, securities, certificates and the like as an effective counterfeiting means.
Recently, in addition to securities, it is affixed to sports equipment, computer parts and other electrical product software, etc., as an authentication sticker that proves the authenticity of the product, and as a seal sticker that is affixed to the package of those products Has also become widely used.
[0004]
[Problems to be solved by the invention]
These so-called authentication seals and seal seals are worried about forgery that once they are peeled off and then pasted onto another product (usually a fake article if fraudulent acts). So-called brittle type seals have been proposed that break. For example, according to Utility Model Registration No. 2032258, a layer using a brittle material is provided in a part of the structure, and if the layer is forcibly removed, the layer portion using the brittle material is destroyed. It is characterized by the spread of destruction.
However, such a technique has a drawback (problem) that it may be easily peeled off by, for example, injuring the pressure-sensitive adhesive with a commercially available label remover (seal remover or the like).
[0005]
The present invention has been made in view of the problems of the prior art, and the purpose thereof is, for example, even if an attempt is made to carry out an illegal act by using a commercially available label remover to carry out fraud It is to provide an OVD seal and a method for manufacturing the OVD seal that are effective in preventing fraudulent actions caused by re-installation.
[0006]
[Means for Solving the Problems]
In order to solve the above problems, the means provided by the present invention is an OVD seal in which at least two layers of an OVD layer and an adhesive layer are laminated in this order on a support using a polymer resin material. And
The OVD seal is characterized in that a curable resin is used for a part or all of the adhesive layer. (Claim 1)
[0007]
The OVD seal according to claim 1, wherein the adhesive layer is made of a resin that is cured by electron beam irradiation. (Claim 2)
According to this, it can be cured in a short time and can be easily applied.
[0008]
The OVD seal according to claim 1, wherein the OVD layer is partially provided in a surface of the OVD seal. (Claim 3)
According to this, the adhesive can be easily cured from the support side.
[0009]
The OVD seal according to any one of claims 1 to 3, wherein the support and the OVD layer are easily separated. (Claim 4)
According to this, if it tries to peel off forcibly, only the support will be peeled off and destroyed.
[0010]
The OVD seal according to any one of claims 1 to 3, wherein a portion that is easily peeled and a portion that is difficult to peel are provided between the support and the OVD layer. (Claim 5)
According to this, when it tries to peel, it will be destroyed partially, and it will be in the state which cannot be restored even if it tries to return.
[0011]
The OVD seal according to any one of claims 1 to 5, wherein a portion that is easily peeled and a portion that is difficult to peel are provided between the OVD layer and the adhesive layer. (Claim 6)
[0012]
A method for producing an OVD seal in which at least two layers of an OVD layer and an adhesive layer are laminated in this order on a support using a polymer resin material,
A OVD seal manufacturing method is characterized in that a curable resin is used for a part or all of the adhesive layer. (Claim 7)
[0013]
In general, the present invention has an adhesive layer mainly composed of a curable resin, and it is difficult to peel off with a commercially available label remover, or even if it is peeled off, it breaks somewhere and is effective in preventing re-sticking. OVD seal is provided.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a cross-sectional view showing the basic structure of the anti-replacement seal of the present invention. 2, FIG. 3, and FIG. 4 are diagrams showing a configuration example of the anti-replacement seal according to the present invention. In the figure, A is a state before peeling, and B is a figure which shows a state when it is peeled and destroyed.
Hereinafter, the present invention will be described in more detail with reference to these drawings.
[0015]
1 includes a support 1, an OVD layer 2, and an adhesive layer 3 that are sequentially laminated. 2, 3, and 4 are seals of a type that completely breaks when peeled off, and each is provided with a peeling layer 24 that is easily peeled between layers or partially.
[0016]
The substrate 1 only needs to have heat resistance and strength that does not soften and deform due to the heat pressure during the sealing process. The materials include polyvinyl chloride, polyester, polycarbonate, polymethyl methacrylate, polystyrene, polyethylene, polyethylene terephthalate, polyethylene naphthalate, polypropylene, polyvinyl alcohol and other synthetic resins, natural resins, paper, synthetic paper, etc. The body can be used.
It is also possible to coat the above-mentioned tough film with a soft thermoplastic resin and remove the film portion after applying an intermediate product or a seal to the substrate.
The thickness is preferably about 2 to 25 μm in consideration of operability and workability.
[0017]
Next, the OVD layer 2 will be described.
OVD is an image using light interference and diffraction, and is a display body that causes a color shift in which the color changes depending on the representation of a stereoscopic image and the viewing angle. Among them, examples of OVDs such as holograms and diffraction gratings include a relief type for recording light interference fringes on a plane as a fine uneven pattern and a volume type for recording interference fringes in the volume direction. On the other hand, a multilayer film system in which a thin film made of ceramics or a metal material having different optical characteristics and a method different from that of a hologram or a diffraction grating is laminated to cause a color change (color shift) depending on the viewing angle is an example.
Among these OVDs, in consideration of mass productivity and cost, a relief hologram (diffraction grating) or a multilayer thin film type is preferable, and these OVDs are generally widely used.
[0018]
Relief-type holograms (diffraction gratings) are produced by producing a relief-type master plate consisting of fine concavo-convex patterns by an optical photographing method, and mass-producing them on nickel press plates in which the patterns are duplicated by electroplating. That is, this press plate is heated and pressed against the OVD forming layer 2a to replicate the uneven pattern.
[0019]
The OVD formation layer 2a is required to have a performance of being moldable by a press plate, and the material thereof may be any of a thermoplastic resin, a thermosetting resin, an ultraviolet ray, or an electron beam curable resin. For example, urethanes added with polyisocyanate as a crosslinking agent to thermoplastic resins such as acrylic resins, epoxy resins, cellulose resins, vinyl resins, acrylic polyols and polyester polyols having reactive hydroxyl groups, etc. Resins, thermosetting resins such as melamine resins and phenol resins, and ultraviolet or electron beam curable resins such as epoxy (meth) acryl and urethane (meth) acrylate can be used alone or in combination. Other than the above, any known material that can form an OVD image can be used.
[0020]
The OVD effect layer 2b is made of a material having a refractive index different from that of the polymer material constituting the relief surface in order to increase the diffraction efficiency of the OVD image. Examples of the material to be used include high refractive index materials such as TiO2, Si2O3, SiO, Fe2O3, and ZnS having different refractive indexes, and metal materials such as Al, Sn, Cr, Ni, Cu, and Au having a higher reflection effect. These materials can be used alone or in layers.
These materials are formed by a well-known thin film forming technique such as vacuum deposition or sputtering, and the film thickness varies depending on the application, but is formed at about 50 to 10,000 mm.
[0021]
On the other hand, when the multilayer thin film method is used, as described above, the OVD layer is composed of a multilayer thin film layer having different optical suitability, and is laminated as a metal thin film, a ceramic thin film, or a composite thin film formed by combining them. For example, when thin films having different refractive indexes are stacked, a high refractive index thin film and a low refractive index thin film may be combined, or a specific combination may be stacked alternately. By combining them, a desired multilayer thin film can be obtained.
[0022]
This multilayer thin film layer is made of a material such as ceramics or metal, and is formed by laminating approximately two or more high refractive index materials and a low refractive index material having a refractive index of about 1.5 with a predetermined film thickness.
An example of the material used below is given. First, as ceramics, Sb2O3 (3.0 = refractive index n: the same applies hereinafter), Fe2O3 (2.7), TiO2 (2.6), CdS (2.6), CeO2 (2.3), ZnS ( 2.3), PbCl2 (2.3), CdO (2.2), Sb2 O3 (2.0), WO3 (2.0), SiO (2.0), Si2 O3 (2.5), In2 O3 (2 .0), PbO (2.6), Ta2O3 (2.4), ZnO (2.1), ZrO2 (2.0), MgO (1.6), SiO2 (1.5), MgF2 (1. 4), CeF3 (1.6), CaF2 (1.3 to 1.4), AlF3 (1.6), Al2 O3 (1.6), GaO (1.7), etc. Examples of the thin film include Al, Fe, Mg, Zn, Au, Ag, Cr, Ni, Cu, and Si. Examples of the low refractive index organic polymer include polyethylene (1.51), polypropylene (1.49), polytetrafluoroethylene (1.35), polymethyl methacrylate (1.49), polystyrene (1. 60). By absorbing at least one kind from these high refractive index materials or 30% to 60% transparent metal thin films and at least one kind from low refractive index materials and alternately laminating them with a predetermined thickness, absorption of visible light of a specific wavelength is achieved. Or it comes to show reflection.
[0023]
In addition, since the optical characteristics such as the refractive index of the thin film made of metal vary depending on the state of the constituent material and the formation conditions, values in certain conditions are used in the embodiments of the present invention.
[0024]
Each of the above materials is appropriately selected based on optical properties such as refractive index, reflectance, and transmittance, weather resistance, interlayer adhesion, and the like, and is laminated as a thin film to form a multilayer thin film. A known method can be used as the formation method, and the film thickness, film formation speed, number of layers, or optical film thickness (= n · d, n: refractive index, d: film thickness) can be controlled. The vacuum evaporation method and the sputtering method are used.
[0025]
These OVD effect layers 2b can be formed by removing arbitrary portions as shown in FIG. 4 or can be removed. Hereinafter, an example of a method of partially providing the OVD effect layer like the OVD effect layer 2b of FIG. 4 will be described. First, a method of printing a pattern with an ink using a water-soluble resin on the OVD forming layer 2a, providing the OVD effect layer 2b, and then washing the water-soluble ink portion can be mentioned. It is also possible to use a method in which masking printing is performed after the OVD effect layer is provided, and then the OVD effect layer 2b is partially dissolved and removed with an alkali or acidic chemical. Any other technique can be used as long as it is a known technique such as a laser removal method.
Thus, by providing an effect layer partially, the designability can be improved.
[0026]
On the other hand, when an adhesive or the like that promotes curing with ultraviolet rays or an electron beam, which will be described later, is used, light does not pass through a portion where the OVD effect layer 2b is present, and curing cannot be expected, but light does not appear when there is no OVD effect layer 2b. Can be cured. When this structure is peeled off, a part of the structure is easily peeled off and a part of the structure is hardly peeled off, and an effect of partial destruction can be expected.
[0027]
The adhesive layer 3 is a layer for attaching and fixing the OVD seal to the adherend, and a curable resin is used so as not to easily dissolve in the release agent. Specifically, a thermosetting adhesive that can be completely cured by applying heat, an electron beam, an ultraviolet curable adhesive, or the like is used.
Examples include urethane polyols that promote the heat curing, thermosetting resins such as melamine curable resins and epoxy curable resins, epoxy (meth ) UV or electron beam curable resins such as acrylic and urethane (meth) acrylate. The above resins can be used alone or in combination with a thermoplastic resin or the like, but are not limited to these as long as they are known adhesive agents with high solvent resistance.
[0028]
On the other hand, the peeling layer 24 is a layer provided so that the whole or a part is peeled off when the seal is peeled off, and the seal is broken, and can be provided between the layers.
The material of the release layer 24 may be any of a thermoplastic resin, a thermosetting resin, an ultraviolet ray, or an electron beam curable resin as long as the material is peeled between layers. Examples include thermoplastic polyacrylate resins, chlorinated rubber resins, vinyl chloride-vinyl acetate copolymer resins, cellulose resins, chlorinated polypropylene resins, epoxy resins, polyester resins, nitrocellulose resins, styrene. Thermoplastic resins such as acrylate-based resins, polyether-based resins, and polycarbonate-based resins, urethane-based cured resins, thermosetting resins such as melamine-cured resins and epoxy-cured resins, epoxy (meth) acryl, urethane (meth) acrylate, etc. And ultraviolet ray or electron beam curable resin.
[0029]
In consideration of releasability, various waxes such as petroleum wax and plant wax, metal salts of higher fatty acids such as stearic acid, mold release agents such as silicone oil, Teflon (R) powder, polyethylene powder, silicone Organic fillers such as fine particles and acrylonitrile-based fine particles, and inorganic fillers such as silica fine particles can be added to reduce the cohesive force of the layer itself and make it easy to break. This release layer is provided on the entire surface or a part of the support and the OVD layer, or between the OVD layer and the adhesive layer, and can be designed so as to be easily broken during peeling.
[0030]
The above has been described with the configuration in which the substrate 1, the OVD layer 2, and the adhesive layer 3 are laminated, which is the simplest configuration of the OVD seal of the present invention. This configuration is a basic configuration, and it is a well-known counterfeit that allows each layer to be colored or a printed layer provided between the layers to improve design, and to verify ultraviolet / infrared light-emitting inks and infrared absorbing inks. It is also possible to appropriately form a printing layer using a prevention ink and enhance the forgery prevention effect according to the purpose. Further, in order to further prevent peeling, it is possible to add a cut to the seal.
[0031]
【Example】
<Example 1>
First, a holo layer is applied to a support made of a transparent polyethylene terephthalate (PET) film having a thickness of 25 μm by a gravure method, then an OVD relief pattern is formed by a roll embossing method, and then a film thickness is formed using a vacuum deposition method. A 0.05 μm Al vapor-deposited thin film layer (OVD effect layer) was provided. Thereafter, an adhesive having thermosetting property was provided by 20 μm by a comma coating method, a release paper was laminated, and an OVD seal was produced. Next, half blanking and scrap removal were performed from the substrate surface side, and the OVD seal shown in FIG. 3 was obtained.
An adhesive layer is made of a curable resin, and a re-sticking prevention seal that cannot be peeled off by a commercially available label release agent or that breaks even if peeled off is provided.
[0032]
[OVD forming layer paint]
Vinyl chloride-vinyl acetate copolymer 15 parts urethane resin 10 parts methyl ethyl ketone 50 parts toluene 25 parts
[Adhesive layer paint]
Acrylic adhesive ... 50 parts isocyanate ... 10 parts methyl ethyl ketone ... 30 parts toluene ... 50 parts
<Comparative example>
After producing a sheet on which OVD was formed by the same method as in Example 1 described above, an adhesive having the following composition was provided by 20 μm by a comma coating method, release paper was laminated, and an OVD seal was produced. Next, half punching and scrap removal were performed to obtain an OVD seal of a comparative example.
[0035]
Each of the OVD seals obtained as described above was affixed to a corrugated cardboard and an attempt was made to remove the seal using a release agent. The seal of Example 1 was tested after it was pasted and stored at 60 ° C. for 7 days.
The results are shown in Table 1.
[0036]
[Table 1]

[0037]
<Example 2>
First, a release layer and a holo layer were applied to a support composed of a transparent polyethylene terephthalate (PET) film having a thickness of 25 μm by a gravure method, respectively, and then an OVD relief pattern was formed by a roll embossing method, followed by vacuum deposition. Using this method, an Al vapor-deposited thin film layer (OVD effect layer) having a thickness of 0.05 μm was provided. Thereafter, etching was partially performed so that Al deposition remained only at the center as shown in FIG.
[0038]
Next, an ultraviolet effect type adhesive was provided by a comma coating method to a thickness of 20 μm, release paper was laminated, and an OVD seal was produced. Furthermore, half blanking and scrap removal were performed from the substrate surface side, and the OVD seal shown in FIG. 4A was obtained.
[0039]
[Peeling layer paint]
Acrylic resin ... 20 parts methyl ethyl ketone ... 40 parts toluene ... 40 parts
[OVD forming layer paint]
Vinyl chloride-vinyl acetate copolymer 15 parts urethane resin 10 parts methyl ethyl ketone 50 parts toluene 25 parts
[Adhesive layer paint]
Acrylate UV effect adhesive: 50 parts Methyl ethyl ketone: 20 parts
Each of the OVD seals obtained as described above was affixed to corrugated cardboard and irradiated with ultraviolet rays from the substrate side to cure the adhesive. As shown in FIGS. 4 and B, when the seal of Example 3 attached in this way is peeled off, the cured part of the adhesive peels off at the peeling layer part, and the uncured part peels off at the adhesive part. OVD broke down.
Table 2 shows the results of peeling using a release agent.
[0043]
[Table 2]

[0044]
In any of the examples, the seal could not be peeled off even when a release agent was used.
[0045]
【The invention's effect】
Thus, the OVD seal of the present invention is made of a hardened adhesive that is hard to break with a release agent. Even if it is peeled off using the release agent, the OVD is not peeled off or is destroyed before it is peeled off.
In other words, according to the present invention, for example, even if an attempt is made to cheat with a commercially available label remover to prevent an improper act, it is effective for not permitting an act of improper due to an improper change. An OVD seal and its manufacturing method could be provided.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an example of an OVD seal configuration of the present invention.
FIG. 2A is a cross-sectional view showing an example of the OVD seal configuration of the present invention.
B: A cross-sectional view depicting a state in which the OVD seal of the present invention shown in A is broken when it is peeled off.
FIG. 3A is a cross-sectional view showing an example of the OVD seal configuration of the present invention.
B: A cross-sectional view depicting a state in which the OVD seal of the present invention shown in A is broken when peeled.
FIG. 4A is a cross-sectional view showing an example of the OVD seal configuration of the present invention.
B: A cross-sectional view depicting a state in which the OVD seal of the present invention shown in A is broken when peeled.
[Explanation of symbols]
1 .. Base material 2 .. OVD layer 2 a... OVD formation layer 2 b... OVD effect layer 3 .. Adhesive layer 24.

Claims (1)

A method of manufacturing an OVD seal in which a release layer, an OVD layer, and an adhesive layer are laminated in this order on a support using a polymer resin material, the OVD layer comprising: The OVD effect layer is partially provided on the surface of the OVD formation layer on the adhesive layer side, and the entire surface of the surface on which the OVD formation layer and the OVD effect layer are provided is irradiated with ultraviolet rays or electron beams. A step of providing the adhesive layer made of a resin to be cured, and a step of curing the portion without the OVD effect layer by irradiating ultraviolet rays or an electron beam from the surface side of the support of the OVD seal. OVD seal manufacturing method.

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