JP2013193758A - Shrink cap and container using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a security shrink cap capable of performing detection with a security ink while having a hologram layer including a metal reflecting layer.SOLUTION: A shrink cap includes at least a heat shrinking layer, a hologram forming layer in which an optical diffraction pattern forming a hologram is recorded as an uneven pattern, a dot-like metal reflective layer reflecting visible light, and partially transmitting the light, and a security ink printed layer successively laminated. A container fitted with the shrink cap on its lid part, is disclosed.

Description

  The present invention relates to a security shrink cap capable of authenticating. In particular, the present invention relates to a shrink cap using a hologram and security ink used for preventing the distribution of counterfeit liquor and a container with a security shrink cap using the same.

Conventionally, a label using a hologram is known as a technique capable of determining authenticity.
For example, in a cash card, a credit card, a prepaid card, a securities, a passbook, a passport, etc., a hologram or the like is pasted to guarantee its authenticity or to give a design such as a card.
The guarantee of authenticity is based on the difficulty of counterfeiting holograms, and the authenticity of a card or the like on which a hologram is affixed is confirmed by visual authentication.

The function of holograms used in conventional cash cards, etc. is mainly to provide visual authenticity or to provide design properties. Unless it is a skilled person, strict appraisal is difficult. It has no function at all regarding fraud prevention and authentication in a processing device such as a card.
For this reason, many proposals have been made to confirm the authenticity of a card or the like by recognizing the hologram reproduction image itself with an optical sensor (Patent Document 3 and others).

However, although relief holograms that have been used in the past have characteristics that are difficult to forge, since they are duplicated by embossing, each time a variable information (for example, serial number) for identifying an individual is assigned, the version is changed. Basically, only the same pattern and information can be given, and variable information must be recorded in a magnetic recording section or print recording section in a different area from the hologram. There was a big restriction on the space and design.
In addition, since the variable information is recorded in a different area from the hologram, the variable information may be rewritten, and the feature of the hologram that is difficult to forge does not guarantee the authenticity of the variable information itself.

As a method for recording variable information for individual identification, a label provided with characters and symbols using security ink that cannot be recognized by human eyes but can be detected by a verification machine such as an infrared detector is known.
For example, in order to prevent forgery and falsification of printed materials such as documents, vouchers, cards, etc., fluorescent light that can not be recognized with ordinary visible light, etc., but can be identified by emitting fluorescence only in the visible light region. There is a latent image technology.

  In order to form this fluorescent latent image, it can be produced by printing using an ink that develops fluorescence when irradiated with ultraviolet rays. However, this anti-counterfeiting method has a problem that an unspecified number of people can recognize the existence of the anti-counterfeiting technology because an inexpensive black light can be purchased and irradiated with ultraviolet rays.

On the other hand, in the medium that requires advanced anti-counterfeiting technology, the anti-counterfeiting effect that can be detected only by a very limited number of people is desired because only the above-mentioned fluorescent light-emitting ink has little anti-counterfeiting effect. For this purpose, infrared absorbing ink, infrared light emitting ink, and the like have been developed.
Even if this infrared ray absorbing ink or infrared light emitting ink is irradiated with infrared rays, the light emitting effect cannot be observed with the naked eye, and it can be observed only with a specific visualization device, and the effect of preventing forgery is high.

  For example, in Patent Document 1, the first print image composed of the first infrared-absorbing printing ink on the substrate and the infrared absorptivity in the infrared wavelength region of the first infrared-absorbing printing ink are: A second print image composed of a second infrared absorbing printing ink having different infrared absorptivity is provided, and both the first print image and the second print image are machine-readable by infrared rays, and either One of them has an infrared wavelength region in which only one of them can be read by a machine, and a machine-readable information printed matter has been proposed.

  Further, in Patent Document 2, in a printed matter provided with an infrared light emitting layer containing an inorganic phosphor that is excited by infrared light and emits light in the infrared wavelength region on a substrate, polyurethane is used as a binder component of the infrared light emitting layer. Resin, polycarbonate resin, polyvinyl butyral resin, polystyrene resin, acrylic silicone resin, alkyd resin, ethylene-vinyl acetate copolymer, ethyl acrylate resin, epoxy resin, phenoxy resin, or modified products thereof At least one binder resin selected, or selected from epoxy acrylate, polyester acrylate, polyether acrylate, urethane acrylate, acrylic alkylate, and alkyl acrylate. There has been proposed an infrared light emitting layer printed matter characterized by containing at least one kind of resin.

Furthermore, as disclosed in Patent Document 4, a security ink that can be detected by a processing device such as a card having an optical reading means and can be detected by a hologram and infrared rays is provided as an optical diffraction pattern recording medium that is difficult to forge or alter. Devices are known.
This device has at least a relief layer in which the light diffraction pattern is recorded as a concavo-convex pattern, a concealing layer that substantially transmits infrared light and does not transmit visible light, and a printing portion comprising an infrared light absorption portion or a reflection portion in order. The optical diffraction pattern recording medium is characterized by being laminated.

In recent years, there has been a demand for a high-capacity shrink cap in order to prevent unauthorized use of the bottle (such as using a bottle of high-quality liquor that has been discarded to sell fake liquor).
As means for that, a shrink label provided with a hologram as in Patent Document 5 and Patent Document 6 has been proposed.

  For example, in Patent Document 5, when a heat-shrinkable film is used as a label film, such as a shrink label for plastic bottles, glass bottles, and dry batteries, the film shrinks due to heat during hologram embossing. Therefore, it has been difficult to add a hologram to the heat-shrinkable film surface.

For this purpose, a label using a heat-shrinkable film, a hologram-formed resin layer embossed with a hologram image on the back surface of the heat-shrinkable label substrate layer as a shrink label having a hologram image formed on the label surface, and A shrink label is proposed in which a metal-deposited reflective layer and an adhesive layer are laminated in this order.
However, with this method, when an aluminum vapor deposition layer is formed on the heat-shrinkable resin base layer as a reflective layer in order to enhance the hologram effect, there is a problem that the vapor deposition layer is cracked by a subsequent shrink process, or the vapor deposition layer is white. There was a problem of becoming.

  Further, in Patent Document 6, the heat-shrinkable resin base material layer has an embossed shape for hologram, and the pattern image can be inspected after pattern printing, and the vapor deposition layer does not peel off even after the shrink process. As a shrink label capable of maintaining the effect, from the outer peripheral side, a pattern printing layer, a heat-shrinkable resin base material layer having an embossed shape for hologram on the inner peripheral surface, and the embossing of the heat-shrinkable resin base material layer A shrink label has been proposed in which transparent vapor-deposited layers are sequentially laminated in a thin film shape following the shape.

Visibility is enhanced by providing a metal reflective layer and a high refractive index layer in the hologram, but when a metal reflective layer is used, in a configuration in which a security ink layer is provided under the hologram layer as in Patent Document 4, The reflective layer interferes with security ink detection.
Specifically, when security ink is to be detected by infrared rays, the security ink cannot be detected because the metal reflection layer blocks infrared rays.
Accordingly, the inventors of the present invention have reached the present invention as a result of earnestly examining the possibility of providing a security shrink cap that can be detected by security ink while having a hologram layer having a metal reflection layer.

JP 2005-246719 A Japanese Patent No. 2992651 JP-A-1-142784 Japanese Patent Laid-Open No. 6-247084 JP 2003-177672-A JP 2010-54865 A

  An object of the present invention is to provide a security shrink cap that can be detected with security ink while having a hologram layer including a metal reflection layer.

  In order to solve the above-mentioned problems, by combining a device verification technology with a hologram whose visual authentication is ambiguous and using an infrared fluorescent pigment that is highly difficult to counterfeit as a security ink used for device verification, In comparison, it is possible to carry out verification using an infrared fluorescent sensor that can be manufactured at a low cost and has a high possibility of spreading.

  According to the first aspect of the present invention, at least a heat shrinkable layer, a hologram forming layer in which a light diffraction pattern for forming a hologram is recorded as a concavo-convex pattern, a dot-like metal reflective layer, and a security ink printing layer are sequentially laminated It is a shrink cap characterized by being made.

  The invention according to claim 2 of the present invention is the shrink cap according to claim 1, wherein a perforation for cutting at the time of opening is formed in a region of the hologram forming layer of the shrink cap. .

  The invention according to claim 3 of the present invention is the shrink cap according to claim 2, wherein a perforation is formed in a region other than the hologram forming layer of the shrink cap.

  The invention according to claim 4 of the present invention is characterized in that the area ratio of the dot-opening portion of the dot-like metal reflective layer is in the range of 5% to 30%. The shrink cap according to item.

The invention according to claim 5 of the present invention is characterized in that the security ink printing layer is printed with a fluorescent ink containing a fluorescent substance that emits light when excited by any one of ultraviolet rays, visible rays, and infrared rays. It is a shrink cap of any one of Claim 1 to 4.

  In the invention according to claim 6 of the present invention, the security ink printing layer is printed with infrared light absorbing ink on the outside of the infrared light reflection layer provided on the inside thereof, or infrared light provided on the inside thereof. The shrink cap according to any one of claims 1 to 4, wherein the shrink cap is printed on the outside of the absorption layer with an infrared light reflecting ink.

  The invention according to claim 7 of the present invention is characterized in that the transparent protective layer is provided on the hologram forming layer side and the release layer is provided on the security ink printing layer side. The shrink cap according to item.

  The invention according to claim 8 of the present invention is a container characterized in that the shrink cap according to any one of claims 1 to 7 is attached to a lid portion.

According to the present invention, by combining a hologram forming layer having a shrinkable layer and a dot-like metal reflective layer that reflects visible light and partially transmits light, and security ink, the security of the hologram can be obtained while maintaining security. A shrink cap capable of mechanically detecting ink can be obtained.
Further, by bonding the shrink layer to the hologram forming layer after hologram embossing, the change in the shape of the hologram at the time of heat shrinkage can be prevented and visibility can be secured.

  The shrink cap of the present invention includes at least a contraction layer that contracts by heating, a hologram formation layer in which a light diffraction pattern for forming a hologram is recorded as a concavo-convex pattern, and a dot-like metal reflection that reflects visible light and partially transmits light This is a shrink cap in which layers of security ink and security ink are sequentially stacked, making it difficult to use both methods of authenticity determination using hologram forgery difficulty and information hiding using machine detection of security ink. As a result, it was possible to obtain a shrink cap that can easily and reliably read out the authentication and secret information.

  A reflective layer made of a metal thin film is provided on the inner surface of the layer on which the hologram diffraction grating is formed to enhance the visibility of the hologram, and the metal reflection is performed so that incident light and reflected light are partially blocked by the metal reflective layer. By providing a dot-like light transmission hole in the layer, a metal reflective layer that reflects visible light and partially transmits light was formed, and a shrink cap capable of detecting the security ink layer inside the metal reflective layer could be obtained.

  Since the perforation is engraved in the region having the hologram forming layer, the hologram forming layer is broken at the time of opening and cannot be repaired. Therefore, the shrink cap cannot be reused, so that it is difficult to forge by displaying a similar brand. . Furthermore, since the perforation is also engraved in the area other than the above, the label is cut at the time of opening, and forgery becomes more difficult.

The security label of the present invention can exhibit its function effectively when the area ratio of the halftone dot openings of the halftone metal reflective layer constituting the security label of the present invention is in the range of 5% to 30%.
That is, when the area ratio of the halftone dot openings is less than 5%, the halftone dot metal reflecting layer hardly transmits light and thus functions as a concealing layer, and the hologram visibility is excellent. It becomes impossible to read information.
When the area ratio of the halftone dot openings exceeds 30%, the distance for reading the information of the security ink layer increases, but the effect as a reflection layer for improving the visibility of the hologram is reduced.

  The security ink printed layer is printed with a fluorescent ink containing a fluorescent material that emits light when excited by one of ultraviolet rays, visible rays, or infrared rays. Information recorded on the security ink printing layer can be read reliably.

In addition, for example, by using a fluorescent material that is excited by infrared rays and emits light in the infrared region for fluorescent ink, it is possible to use a detection method in which the information reading operation itself cannot be detected from the appearance.
The fluorescent ink containing the fluorescent substance cannot be visually distinguished from the ink not containing the fluorescent substance, and emits light only when infrared light is irradiated in an apparatus including a light source having a specific wavelength. In this case, the color development is in the infrared region outside the visible light region and cannot be visually confirmed.

In the shrink cap of the present invention, an infrared light absorbing ink or an infrared light reflecting ink can be used as the security ink.
In order to detect the recording information of the infrared light absorbing ink with certainty, it is necessary to increase the infrared light absorbability of the infrared light absorbing ink. There is also a problem that the visibility of fluctuates.

The security ink printing layer is printed on the outside of the infrared light reflecting layer provided on the inner side with infrared light absorbing ink, so that the difference in the absorptance between the reflecting layer and the absorbing ink layer increases and the contrast is clear. Machine reading is more reliable.
The same applies to the case where the outer side of the infrared light absorbing layer provided on the inner side is printed with the infrared light reflecting ink.

As described above, according to the present invention, it is possible to provide a security shrink cap that can be detected with security ink while having a hologram layer provided with a metal reflection layer.
By covering the shrink cap over the lid of the container and making it heat-shrink and adhere, the authenticity determination of the target container can be performed more reliably, and the reuse of the label can also be prevented.

The cross-sectional schematic diagram which shows an example of a structure of the shrink cap of this invention (halftone dot formation by an etching). The cross-sectional schematic diagram which shows another example of a structure of the shrink cap of this invention (halftone dot formation by a laser). The cross-sectional schematic diagram which shows another example of a structure of the shrink cap of this invention. The cross-sectional schematic of the security ink layer of the shrink cap of this invention. The manufacturing process schematic of the cap using the shrink cap of this invention.

The shrink cap according to the present invention will be described with reference to the drawings as necessary. FIG. 1 is a schematic cross-sectional view showing an example of the configuration of the shrink cap of the present invention, which is an example in which halftone dots are formed on a metal reflection layer by etching.
FIG. 2 is a schematic cross-sectional view showing another example of the configuration of the shrink cap of the present invention, which is an example in which halftone dots are formed on the metal reflective layer by a laser.
FIG. 3 is a schematic cross-sectional view showing another example of the configuration of the shrink cap of the present invention. A polyethylene terephthalate film is used as the base material of the hologram forming layer, and the surface of the security ink layer is used to prevent blocking during winding. This is an example when a release layer is provided.
FIG. 5 is a conceptual diagram of a typical usage as a shrink cap in which the shrink cap of the present invention attached to the back of a cylinder is placed on the neck of the container and then heat-shrinked so as to adhere to the neck of the container. ) To (e).

  The shrink cap (1) according to the present invention, as shown in the schematic diagram of the cross section in the case of the simplest configuration in FIG. 1, has a light diffraction pattern for forming a hologram on the surface of the heat shrink layer (2). A shrink cap formed by sequentially laminating a hologram forming layer (4), a halftone dot metal reflecting layer (5) that reflects visible light and partially transmits light, and a security ink printing layer (6). is there.

As the heat-shrinkable layer (2), a known material such as a stretched polystyrene (PS) film or a stretched polyethylene terephthalate (PET) film that shrinks by ordinary heating can be used.
As the stretched PET film used for shrink wrapping, for example, a film that shrinks by about 50% in the horizontal direction and about 25% in the vertical direction by heating for about 5 seconds at around 100 ° C. is used.

The heat-shrinkable layer (2) and the hologram layer (45) can be bonded by a usual method such as dry lamination.
Note that the hologram layer can be formed in a stripe shape so that the hologram layer can be easily attached to the heat-shrinkable layer.

As the hologram forming layer (4), a known layer such as a diffraction structure or a volume hologram can be used.
As a light diffraction pattern recorded as a concavo-convex pattern, a relief hologram or a relief diffraction grating in which the intensity distribution of the interference fringe light due to the interference between the object light and the reference light is recorded as a concavo-convex pattern can be recorded. Holograms, Fraunhofer holograms, lensless Fourier transform holograms, laser reproduction holograms such as image holograms, and white light reproduction holograms such as rainbow holograms, color holograms utilizing these principles, computer holograms, hologram displays, multiplex holograms, Examples include holographic stereograms and holographic diffraction gratings that use hologram recording means. In addition, the diffraction gratings are mechanically created using an electron beam drawing device, etc. Can also be mentioned the diffracted light hologram or diffraction grating is obtained, and these may be recorded in a single or multiple.

For example, in the case of a hologram using a diffractive structure, the light diffraction pattern is expressed by using a photosensitive resin, a thermoplastic, or the like to form a relief hologram or a relief diffraction grating. The resulting relief hologram or relief diffraction grating is molded by plating or the like to create a mold or a resin mold and used. It becomes possible.
The hologram forming layer (4) is made of a moldable synthetic resin and has a thickness of about 0.4 to 4 μm, preferably 1 to 2 μm.

  Examples of the synthetic resin that can be molded include the following. Thermoplastic resins such as polyvinyl chloride, acrylic (eg, MMA), polystyrene, polycarbonate, unsaturated polyester, melamine, epoxy, polyester (meth) acrylate, urethane (meth) acrylate, epoxy (meth) acrylate, polyether (meta ) Cured thermosetting resins such as acrylates, polyol (meth) acrylates, melamine (meth) acrylates, triazine acrylates, etc., or mixtures of the above thermoplastic resins and thermosetting resins can be used.

The halftone dot metal reflecting layer (5) shown in FIG. 1 gives reflectivity to the light diffraction pattern of the hologram forming layer (4), and includes Cr, Ti, Fe, Co, Ni, Cu, Ag, Au, It is formed by using metals such as Ge, Al, Mg, Sb, Pb, Pd, Cd, Bi, Se, Sn, In, Ga, and Rb, and oxides and nitrides thereof alone or in combination of two or more.
Of these metals, Al, Cr, Ni, Ag, Au and the like are particularly preferable.
The dot-like metal reflective layer (5) can be formed by a method such as vapor deposition, sputtering, ion plating, CVD, or plating, and the thickness is preferably 20 to 100 nm.

As shown in FIG. 2, a mask layer (7) is formed on the metal of the reflective layer, and the metal of the reflective layer is partially etched by etching. A known method such as a method of removing or partially removing or modifying the metal of the reflective layer with a laser or the like as shown in FIG. 1 can be used.
For the mask layer (7), a resin material that is resistant to an etching solution and formed by a normal printing method can be used.

It is preferable that the area ratio of the dot-shaped apertures of the metal reflective layer formed in this way is in the range of 5 to 30%.
If it is less than this, the visibility as a hologram is poor, and if it is more than this, the reflection layer hinders light transmission, which hinders mechanical detection.
More preferably, it is 20 to 25%. The shape of the dot-like opening of the metal reflection layer is not limited.

As the ink of the security ink layer (6) shown in FIG. 1, fluorescent ink, ink having absorption in the infrared region, or the like can be used.
As the ink having absorption in the infrared region, an ink composed of a substance having absorption in the infrared region and a solvent can be used, and an acrylic resin binder or the like can be contained as necessary.

FIG. 4A shows a cross section when an infrared light absorbing ink layer (6a) is formed on the surface of the infrared light reflecting layer (12) as the security ink layer (6).
Binders that can be used in infrared light absorbing inks include, for example, red made of carbon black, blackened silver, cyanine dyes, phthalocyanine dyes, natoquinone dyes, anthraquinone dyes, diol dyes, triphenylmethane dyes, etc. After adding various pigments and dyes that absorb external light, and after adding plasticizers, stabilizers, waxes, greases, desiccants, drying aids, curing agents, thickeners, and dispersants as necessary Ordinary gravure method, offset method, silk method, thermal transfer method using thermal head, sublimation transfer method, ink jet method, electrostatic adsorption method, etc. using paint or ink sufficiently kneaded with solvent or diluent The printing method can be used to form a desired portion.

The security ink layer (6) may be printed by printing the infrared light reflecting ink (6b).
In that case, instead of the base material (12) that reflects infrared light, resins such as nylon, cellulose diacetate, polyvinyl chloride, polystyrene, polyethylene, polypropylene, polyester, polyimide, and polycarbonate, or carbon to these resins Substrates that absorb or transmit infrared light mixed with black, silver black, cyanine dyes, phthalocyanine dyes, natoquinone dyes, anthraquinone dyes, diolol dyes, triphenylmethane dyes, and the like (11) ) Is used.

Fluorescent ink can be used as the ink of the security ink layer (6) shown in FIG. As the fluorescent ink, for example, a pigment that emits visible light when irradiated with ultraviolet light, a pigment that emits infrared light when irradiated with infrared light, and an ink made of resin can be used.

  Examples of infrared emitting pigments include vanadates, molybdates, tungstates, phosphates, etc. doped with neodymium and ytterbium, and elements that can take part of this neodymium or ytterbium. Substituted materials can be used.

As such a pigment, for example,
Ca ₁₀ (PO ₄ ) ₆ F ₂ : Nd, Yb
Ca ₈ La ₂ (PO ₄ ) ₆ O ₂ : Nd, Yb
YAlO ₃ : Nd, Yb
Y ₃ Al ₅ O ₁₂ : Nd, Yb
_{(Y, La, Lu) PO} 4: Nd, Yb
(Nd, Yb) P ₃ O ₉
(Nd, Yb) P ₅ O ₁₄
(Li, Na, K) (Nd, Yb) P ₄ O ₁₂
K ₃ (Nd, Yb) P ₂ O ₈
Na (Nd, Yb) (WO ₄ ) ₂
Na ₅ (Nd, Yb) (WO ₄ ) ₄
Na (Nd, Yb) (MoO ₄ ) ₂
Na ₅ (Nd, Yb) (MoO ₄ ) ₄
Na ₂ (Nd, Yb) Mg ₂ (VO ₄ ) ₃
(Al, Cr) ₃ (Nd, Yb) (BO ₃ ) ₄
Na ₅ (Nd, Yb) ((Si, Ge) O ₃ ) ₄
Na ₃ (Nd, Yb) (Si, Ge) ₂ O ₇
(Nd, Yb) MgAl ₁₁ O ₁₉
(Y, La, Nd, Yb) VO ₄
And other materials.
As the fluorescent ink, an ink made of a fluorescent substance and a solvent is used, and an ink that contains an acrylic resin binder as necessary may be used.

As shown in FIG. 4A, when an ink (6a) having absorption in the infrared region is used as the security ink, it is preferable to further provide an infrared light reflection layer (12) on the back side.
By providing the infrared light reflection layer (12), an infrared absorption pattern by ink can be detected with high contrast when performing mechanical detection. In addition, when sticking to an infrared light reflective substance, an infrared light reflection layer does not need to be provided.
The infrared light reflection layer (12) can be composed of a resin material appropriately selected in consideration of characteristics required as a base material.

  In addition, Fast Yellow G, Fast Yellow 10G, Disazo Yellow AAA, Disazo Yellow AAMX, Disazo Yellow AAOT (above, yellow pigment), Toluidine Red, Naphthol Carmine FB, Naphthol Red M, Viralozone Red (above, red pigment), Victoria Pure Blue BO Lake, Bootsick Blue 5B Lake, Fast Sky Blue, Alkali Blue G Toner, Reflex Blue (above, blue pigment), Aniline Black, Iron Black, Format Black (magenta + cyan) (above, black pigment), Infrared reflective layer (12) is formed by applying or printing paint or ink containing materials that reflect infrared light such as zinc white, titanium white, calcium carbonate, barium sulfate, alumina white (and above, white pigment) To do Can, also, it is also possible to configure the base material by kneading a material that reflects infrared light to synthetic resin to reflect infrared light.

  As shown in FIG. 3, in addition to the basic structure of FIG. 2, a transparent substrate (8) such as a PET film for applying the hologram forming layer (4) is heated via the adhesive layer (10). A structure in which a release layer (9) is provided on the surface of the security ink layer (6) in order to adhere to the shrink layer (2) and prevent blocking in the wound state may be employed.

<Example 1>
The shrink cap of the present invention was prepared by the following method and attached to the neck of the container.
A melt of acrylic resin (polymethyl methacrylate: PMMA) was applied to the surface of a PET substrate (8) having a thickness of 12 μm as a hologram forming layer (4) so as to have a film thickness of 10 μm after drying and dried.

Thereafter, the surface of the acrylic resin layer was heated and pressed with an embossed plate to form a diffractive structure, and an aluminum thin film with a thickness of 150 nm was provided thereon as a metal reflective layer by vapor deposition.
Further, a mask layer is provided at an arbitrary area ratio thereon, and then the reflective layer is partially removed by an etching solution, and the dot-like metal reflection in which the area ratio of the dot-like openings in the metal reflection layer is 5%. Layer (5) was formed.

Next, a character symbol is formed as a security ink layer (6) with an ink containing 10 wt% of solid substance of infrared fluorescent substance Na ₅ (Nd, Yb) (MoO ₄ ) ₄ having a particle diameter of 2 μm as a fluorescent pigment. (103) Further, after the release layer (9) was provided on the back surface, a shrink cap was formed by the process shown in FIG.

  Next, in the step shown in FIG. 5, after peeling off the release layer (9) of the label, it is slit in the winding direction (vertical direction in the figure), and then printed (101) as a heat shrink layer (2) in advance. The applied 25 μm-thick biaxially stretched polyethylene terephthalate (PET) film (FIG. (A)) was bonded to the non-printing region (102) via an adhesive layer (10) formed of a urethane-based adhesive ( (B).

Then, after the perforation (Fig. (B)), the left and right ends are bonded to form a cylindrical shape (Fig. (C)). A shrink top container (figure (e)) was formed by covering with a hot air and shrinking with hot air.
This shrink top container is not only easy to open because the perforation is also engraved in the security printing area (103), but after opening the security ink layer (6) is destroyed, the label is resealed. It cannot be reused and cannot be displayed falsely.

<Example 2>
A shrink top container (2) was obtained in the same manner as in Example 1 except that the area ratio of the dot-like openings in the metal reflective layer was 10%.
<Example 3>
A shrink top container (2) was obtained in the same manner as in Example 1 except that the area ratio of the dot-like openings in the metal reflective layer was 15%.
<Example 4>
A shrink top container (2) was obtained in the same manner as in Example 1 except that the area ratio of the dot-like openings of the metal reflective layer was 20%.
<Example 5>
A shrink top container (2) was obtained in the same manner as in Example 1 except that the area ratio of the dot-like openings of the metal reflection layer was 25%.
<Example 6>
A shrink top container (2) was obtained in the same manner as in Example 1 except that the area ratio of the dot-like openings in the metal reflective layer was 30%.

<Comparative Example 1>
A shrink top container (2) was obtained in the same manner as in Example 1 except that the area ratio of the dot-like openings in the metal reflective layer was 0%.
<Comparative example 2>
A shrink top container (2) was obtained in the same manner as in Example 1 except that the area ratio of the dot-like openings in the metal reflection layer was 100%.

The visibility of the obtained shrink top container as a hologram and the maximum detection distance of a fluorescence reading machine from the security ink layer were measured and evaluated. It was excited by irradiation with a light-emitting lamp containing infrared light having a wavelength of 825 nm, and infrared light near 987 nm was detected.
The maximum detection distance of fluorescence emission was prepared based on the shrink top container without the metal reflection layer, and the ratio of the detection distance to the detection distance of the reference shrink top container was expressed in%.
The results are shown in Table 1. In the results, ◎ means no problem, ○ means almost no problem, △ means usable, and x means unavailable.

From the evaluation results shown in Table 1, in Comparative Example 1 in which the area ratio of the dot-like openings in the metal reflective layer is 0%, the infrared light emitted from the security layer is completely blocked by the metal reflective layer. It cannot be detected from the front side.
Further, in Comparative Example 2 in which the area ratio of the dot-like opening portions of the metal reflection layer is 100%, the visibility of the hologram is not possible because there is no metal reflection layer.

In Examples 1 to 6, as the area ratio of the dot-like apertures of the metal reflection layer increases, the visibility of the hologram decreases, but conversely, the maximum detection distance of fluorescence emission increases and the metal reflection layer It is considered that the allowable range of both is the range where the area ratio of the dot-like apertures is 5% to 30%.
Among them, the conditions of Examples 2 to 5, that is, the conditions where the dot-like aperture area ratio of the metal reflection layer is 10% to 25% are the optimum ranges that satisfy both the requirements of visibility and detection distance. It was.

  Thus, according to the shrink cap of the present invention, by combining the hologram forming layer having the dot-like metal reflective layer and the security ink, the mechanical detection of the security ink is possible while having the visibility of the hologram. I was able to make it a shrink cap.

  The technology of the shrink cap of the present invention requires a high level of anti-counterfeiting by combining different effects by providing a coating having both reflectivity and transparency between two different optical effect layers by a simple means. Can be used for

1 ... Shrink cap 2 ... Shrink layer (shrink film)
DESCRIPTION OF SYMBOLS 3 ... Seal 4 ... Hologram formation layer 45 ... Hologram layer 5 ... Halftone dot metal reflection layer 6 ... Security ink layer 6a ... Infrared light absorption ink layer 6b ... Infrared light reflection ink layer 7 ... Mask layer 8 ... Hologram layer base Material 9 ... Release layer 10 ... Adhesive layer 11 ... Infrared light absorbing layer 12 ... Infrared light reflecting layer 101 ... Printing part 102 ... Non-printing part 103 ... Security printed hologram 104 ... Perforation

Claims (8)

  A shrink cap characterized by comprising at least a heat shrink layer, a hologram forming layer in which a light diffraction pattern for forming a hologram is recorded as a concavo-convex pattern, a dot-like metal reflective layer, and a security ink printing layer.   2. The shrink cap according to claim 1, wherein a perforation for cutting at the time of opening is formed in a region of the hologram forming layer of the shrink cap.   The shrink cap according to claim 2, wherein a perforation is formed in a region other than the hologram forming layer of the shrink cap.   The shrink cap according to any one of claims 1 to 3, wherein an area ratio of a halftone dot opening portion of the halftone dot metal reflective layer is in a range of 5% to 30%.   The security ink printing layer is printed with a fluorescent ink containing a fluorescent substance that emits light when excited by any one of ultraviolet rays, visible rays, and infrared rays. The shrink cap described.   The security ink printing layer is printed with infrared light absorbing ink on the outside of the infrared light reflecting layer provided on the inside thereof, or the infrared light reflecting ink is printed on the outside of the infrared light absorbing layer provided on the inside with the security ink printing layer. The shrink cap according to claim 1, wherein the shrink cap is printed.   The shrink cap according to claim 1, wherein the transparent protective layer is provided on the hologram forming layer side, and the release layer is provided on the security ink printing layer side.   A container, wherein the shrink cap according to claim 1 is attached to a lid.

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