WO2005110766A1 - Fil présentant la fonction d'évaluer une authenticité et feuille anti contrefaçon l'utilisant - Google Patents

Fil présentant la fonction d'évaluer une authenticité et feuille anti contrefaçon l'utilisant Download PDF

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Publication number
WO2005110766A1
WO2005110766A1 PCT/JP2004/007021 JP2004007021W WO2005110766A1 WO 2005110766 A1 WO2005110766 A1 WO 2005110766A1 JP 2004007021 W JP2004007021 W JP 2004007021W WO 2005110766 A1 WO2005110766 A1 WO 2005110766A1
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WO
WIPO (PCT)
Prior art keywords
thread
layer
paper
function
light
Prior art date
Application number
PCT/JP2004/007021
Other languages
English (en)
Japanese (ja)
Inventor
Toru Murakami
Shinichi Akahori
Hironori Miura
Original Assignee
Tokushu Paper Mfg. Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tokushu Paper Mfg. Co., Ltd. filed Critical Tokushu Paper Mfg. Co., Ltd.
Priority to PCT/JP2004/007021 priority Critical patent/WO2005110766A1/fr
Publication of WO2005110766A1 publication Critical patent/WO2005110766A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/355—Security threads

Definitions

  • the present invention relates to a thread having an authenticity judgment function, and a forgery prevention paper using the thread.
  • a thread having an authenticity judgment function under normal light such as indoor light or natural light, it only looks like a thread with excellent pearl luster, but it is hidden when viewed with a device that can radiate infrared rays and visualize it.
  • the present invention relates to a thread having an advanced function of judging authenticity such that characters and images such as characters can be seen, and to forgery prevention paper using the same. Background technology
  • Securities with monetary value such as banknotes, gift certificates, stock certificates, bonds, checks, lotteries, etc.
  • This counterfeit prevention measure can be broadly divided into two. The first is to use anti-counterfeit paper, that is, anti-counterfeit paper, and the second is to apply anti-counterfeit measures by printing.
  • the aforementioned securities may be counterfeited by a method using a multi-color printing machine, a method using a color copier, a method of capturing an image with a scanner linked to a personal computer, and printing the image with a power printer.
  • a method using a multi-color printing machine a method using a color copier
  • a method of capturing an image with a scanner linked to a personal computer a method of capturing an image with a scanner linked to a personal computer
  • printing the image with a power printer There are many. Recently, the resolution, hue, etc. have become much more elaborate so as to be indistinguishable from genuine products, and counterfeit products can be produced relatively easily.
  • Techniques for authenticity determination using this merism include the colors that can be seen under normal light, such as sunlight, fluorescent lamps, and incandescent lamps, and whether they can be viewed through a desired filter or a desired spectral energy distribution.
  • Forgery prevention technology using metameric ink which is a color material having a metameric property in which colors seen under a light source have different hue, lightness, and saturation, has been proposed. See 8711.
  • a desired pattern group is formed as a combination pattern on the surface of paper with this metameric ink and ordinary printing ink of the same color under normal light, for example, when copied using a color copier, In this case, the same color was found, and a difference was found between the two colors, which proved to be counterfeit.
  • Another example is anti-counterfeit paper in which a paper base or a paper base made of pulp fiber is coated with a paper piece or fiber piece coated with an ink containing a metallic coloring material, and securities using the same.
  • Has been proposed see Japanese Patent Application Laid-Open No. 2001-159904.
  • the applicant first made up of two or more layers of laminated paper, and the outermost paper layer Is 20 to 50 g / m 2 and contains glittering strips (see Japanese Patent No. 3 075 544). ). Further, at least one or more underlayer printing coatings formed on the substrate to be printed using an ink containing no pearl pigment to improve the smoothness of the surface of the substrate to be printed are laminated. There is also proposed a pearl-like printed material, characterized in that at least one layer of a pearl print film formed using a pearl ink containing a pearl pigment is laminated on the base print film. Japanese Patent Laid-Open No. 2001-260705).
  • the surface of the substrate to be printed is rough, and the orientation direction of the pearl pigment in the printed coating film is not constant.
  • the objective is to eliminate the problem of insufficient pearl luster.
  • the hue of the underlayer printing film be a dark color having relatively low brightness in order to make the pearl luster of the upper layer pearl printing film easily visible.
  • anti-counterfeit paper having a high anti-counterfeit effect there is a paper called “paper with a window thread”.
  • the method for producing this anti-counterfeit paper is a method in which a stock suspension on a wire is buried with a belt mechanism having a groove passing through a thread at the tip of a convex part of a guide having a concave and convex part (Japanese Patent Publication No. 5-500).
  • Injection method see US Patent No.
  • the present applicant has also proposed a thread to be used for such anti-counterfeit paper (see Japanese Patent No. 3262008), and the multilayer pearlescent film is described in paragraph 047 of the same publication.
  • a thread material To be used as a thread material.
  • the forgery-preventing printing technology using metameric proposed in Japanese Patent Publication No. 60-58711 and Japanese Patent Application Laid-Open Publication No. 2001-159904 described above has this mechanism.
  • one of the metallic coloring materials is an inorganic coloring pigment with excellent light resistance
  • the other is a combination of organic dyes with poor light resistance.
  • the printed surface was discolored by light in a short time, or discolored during long-term storage.
  • the hues of pearl pigments proposed in Japanese Patent Application Laid-Open No. Hei 6-3133298 and Japanese Patent No. 3075454 have a mild pearl color and lack contrast with the color of paper. The problem was that the visibility was slightly inferior. Also, the pearl-like printed matter proposed in the above-mentioned Japanese Patent Application Laid-Open No. 2001-265017 could be forged relatively easily once the mechanism is known. Further, the anti-counterfeit paper proposed by the present applicant in Japanese Patent Application Laid-Open No. 08-31180 and Japanese Patent No. 3262008 is required to further enhance the anti-counterfeit technology. ing. Disclosure of the invention
  • the present invention solves the above-mentioned problems of the prior art, and has a completely new anti-counterfeit technology (authentication) that has a clear chili color that cannot be obtained with the hues of pearl pigments and further enhances the anti-counterfeit effect. (Judgment function).
  • One of the surfaces of the multilayer pearlescent film 1, which has the ability to transmit light, is provided with a printed layer 3a such as a pattern or a character having the ability to absorb infrared rays, and a pattern or a character having a performance to reflect infrared rays.
  • a printing layer 3b and an adhesive layer 4 are provided, and a printing layer 3a of a pattern or a character having the performance of absorbing the infrared rays and a printing of a pattern or a character having a performance of reflecting infrared rays are provided.
  • Layer 3b is a thread having an authenticity judgment function characterized in that it looks the same color under ordinary light and has a different spectral reflectance in the infrared region.
  • the second invention of the present invention which is described with reference to FIG. 2, is anti-counterfeit paper characterized in that the thread T is exposed at a window opening W formed on the surface of the paper.
  • FIG. 1 is a partially enlarged cross-sectional view of a thread having an authentication function of the present invention.
  • FIG. 2 is a partially enlarged top view of a forgery prevention sheet having a window-opening thread into which a thread having an authenticity judgment function of the present invention is formed.
  • Figure 3 is a graph showing the results (spectral reflectance curve) of indigo ink printed on coated paper using an RI tester and measured with a spectrophotometer.
  • Figure 4 is a graph showing the results (spectral reflectance curves) of yellow ink printed on coated paper using an RI tester and measured with a spectrophotometer.
  • Fig. 5 is a graph showing the results (spectral reflectance curve) of red ink printed on coated paper using RI TES, and measured with a spectrophotometer.
  • FIG. 6 shows the results of spectrophotometer measurements of black ink mixed with indigo, yellow, and red inks printed on coated paper using an RI tester with a spectrophotometer, and carbon black as a colorant.
  • FIG. 4 is a graph showing the results of measurement of a paper printed on coated paper using the used black ink with a spectrophotometer.
  • FIG. 7 shows an example in which a print layer is formed on a piece of paper in the form of a fine pattern.
  • FIG. 8 is an image obtained by irradiating the printed matter of FIG. 7 with infrared rays and visualizing the infrared rays.
  • Figure 9 shows an example of printing a microphone word that absorbs infrared light.
  • FIG. 10 is an image visualized by irradiating the thread of the present invention with infrared rays.
  • the first invention of the present invention a pattern having a function of absorbing infrared light on one surface of a multilayer pearlescent film 1 having a performance of transmitting both visible light and infrared light shown in FIG. And a printed layer 3a for characters and characters, a printed layer 3b for reflecting infrared rays, and an adhesive layer 4 are provided.
  • a thread having an authenticity judgment function which is characterized in that it is described above, will be described.
  • the terms “transmission”, “absorption” and “reflection” used in the present invention mean “completely transmitted (transmittance 100%)”, “completely absorbed”.
  • the multi-layer pearlescent film 1 is characterized by its iridescent iris when viewed with specular reflection light.
  • the product name is “AURORA FILM”, Engelhard
  • This film consists of a number of parallel layers of transparent thermoplastic resin material (usually tens to hundreds of layers), and adjacent layers are made of various resin materials having different refractive indexes.
  • the individual layers of this film are very thin and their thickness is in the range of tens to hundreds of nm, thereby causing a lot of interference and developing an iris color
  • the Multilayer films consist of a supply block that collects the melt from each of the two or more extruders and places it in the desired layer pattern, usually in a single die manifold die for flat manifold films. It can be obtained, for example, by manufacturing by a low-temperature roll casting method by using in combination with.
  • this multi-layer pearlescent film enhances its pearly luster by being attached to the surface of printed paperboard, and this effect is widely used in the field of packaging. . It is well known that this effect increases as the brightness of the printed layer decreases.
  • anti-counterfeiting paper which is made from fine pearl luster film called Dali Yuichi and then milled on the paper surface, is used as a 100,000 gil sheet in the Netherlands. It is widely known that it had been adopted.
  • the present inventors have paid attention to the peculiar performance of this multilayer pearlescent film and have made various studies with the aim of developing a new technology for preventing forgery, thereby completing the present invention. That is, the present inventors have found that the above-mentioned multilayer pearlescent film has both visible light (that is, light having a wavelength of 380 nm to 770 nm) and infrared light (that is, light having a wavelength of 770 nm to 2). The present inventors have found that the film has the ability to transmit light, and found that a completely new anti-counterfeiting film can be produced by combining this with the above-mentioned penetration phenomenon, thereby completing the present invention.
  • a printed layer 3 a of a pattern or a character having an ability to absorb infrared rays” and “a pattern or a letter or the like having a performance of reflecting infrared rays” (In the present invention, the print layer 3a and the print layer 3b are collectively referred to as the print layer 3).
  • the printed layer 3a of a pattern or a character having the ability to absorb the infrared rays and the printed layer 3b of a pattern or a letter having a performance of reflecting the infrared rays are composed of a white light bulb, a fluorescent lamp, and a sun. It looks the same color under normal light such as light, It is necessary to make the spectral reflectances in the infrared region different.
  • the printing layer 3 is formed using printing ink or paint.
  • printing inks are based on colorants, vehicles, and auxiliaries.
  • the coloring material is composed of organic or inorganic pigments and dyes
  • the vehicle is composed of oil, resin, pitch, solvent, plasticizer, etc.
  • the auxiliary is wax, grease, dryer, antioxidant, wetting agent, etc.
  • Consists of The coating material is prepared by using a coloring material and a binder as main components, and appropriately adding the above-mentioned auxiliary agents. At this time, the organic solvent resistance can be increased by appropriately using a crosslinking agent such as a dissocyanate-based resin in order to improve the organic solvent resistance of the resin or the binder.
  • a coloring material having a unique performance is used. In other words, under normal light, they look the same color (this invention includes not only chromatic colors but also achromatic colors), but a unique effect is exhibited by a combination of color materials having different spectral reflectances in the infrared region. .
  • Organic pigments include well-known pigments such as Resor Red, Lake Red C, Carmine 6B, Quinacrine Red, Isoindoline Yellow, Quinophthalone Yellow, Disazoyello, Futaguchi Cyanine Blue, and Alkaline Blue.
  • the spectral reflectance in the infrared region can be changed by adding a white pigment which is white or pale under normal light to the above-mentioned color material.
  • a white pigment which is white or pale under normal light
  • pigments having a high reflectance of ordinary light and a low reflectance in an infrared region for example, well-known pigments such as phosphate-based white crystals and glass-based powders and ITO (indium-tin oxide) powders can be suitably used. .
  • inks normally used to produce color prints are trying to reproduce all colors using the three primary colors of indigo ink, yellow ink, and red ink.
  • Ink mixing indicates so-called “subtractive color mixing", and when the three primary colors are mixed together, it becomes “black”. Actually, it does not become black as theoretically, so printing using carbon black as a color material called “black ink” is performed.
  • black ink Normally, cyan ink blue is used as a coloring material for indigo ink, disazoiello I is used as a coloring material for yellow ink, and Rikichi Min 6B is used as a coloring material for red ink.
  • Figure 3 shows an indigo ink that uses Fusi Russian Nimble I as a color material, and is printed solid on a coated paper of 90% using an RI tester and measured with a spectrophotometer. (Reflectance curve).
  • Fig. 4 shows the results of a yellow ink using disazoeiro-1 as a coloring material, printed solid on a coated paper of ⁇ R> 90> using an RI tester and measured with a spectrophotometer (spectral reflectance curve). Is shown.
  • Fig. 5 shows the results of a spectrophotometer measurement of a red ink using Riki-Min 6B as a coloring material, which was solid printed on a coated paper of 90% using an RI tester. Rate curve).
  • Fig. 6 shows a spectrum of the solid printed on the coated paper of 90-90% using RI test using the black ink mixed with the indigo ink, yellow ink and red ink. The results obtained by a photometer and the results of measurements by a spectrophotometer on black and white ⁇ 46> coated paper using black ink using carbon black as the coloring material are shown.
  • the spectral reflectance curve of the printing surface using ink mixed with “blue, yellow, and red ink” has a wavelength of 400 to 700.
  • the reflectivity at nm is extremely low, and after 700 nm, the reflectivity sharply increases, indicating a slightly reddish black appearance.
  • the spectral reflectance curve of the printing surface using ⁇ carbon black ink '' also shows that the reflectance in the visible light region is almost the same as the reflectance of the ink mixed with ⁇ blue + yellow + red ink '' and turns black. It shows that you can see. Since the difference between the two is very small, as shown in Fig.
  • a multilayer pearlescent film 1 has the ability to transmit both visible light and infrared light. Even if the layer 3a and the printed layer 3b of a pattern or a character having the ability to reflect infrared rays are formed, the difference between the two can not be substantially confirmed, and the layer looks only black.
  • FIGS. 7 and 8 illustrate this in detail.
  • Fig. 7 shows an example in which a print layer is formed with a finely patterned pattern on a 46 * 90 coated paper, and the finely patterned print layer 3a is black ink using carbon black and the finely patterned print layer 3 b is formed using black ink mixed with indigo, yellow, and red inks. Under normal light, the printed layers 3a and 3b look the same color (black) under normal light, as shown in Fig. 7.
  • infrared rays Although the reflectance of infrared rays is different, devices that can visualize the image, such as an LED that emits infrared rays with a peak wavelength of 830 nm or 900 nm or an infrared ray with a wavelength of 160 nm, Infrared light is emitted using a glass laser that emits light, and the image is taken with a CCD camera or the like with the infrared filter removed, and observed using a device that projects an image on a CRT. Only a appears black, and printing layer 3 b is not visible because it is not visible.
  • the printing layer 3 is a method in which the printing layer 3a is printed first, and the printing layer 3b is overprinted thereon (for example, FIG. 1) .
  • the printing layer 3b is printed first, and the printing layer 3a is stacked thereon.
  • Printing method, printing method with printing layer 3a and printing layer 3b in contact, printing method with printing layer 3a separated from printing layer 3b, printing layer 3b as part of printing layer 3a May be used singly or in a combination of a plurality of methods such as overlapping.
  • the printing layer 3 is printed with characters and patterns (in the present invention, the entire printing is also included in the category of patterns). In this case, the characters and patterns are printed by either solid printing or halftone printing. It may be expressed by the following method.
  • the 3a printing layer since the effect of enhancing the anti-counterfeiting effect is great, it is preferable to form the 3a printing layer with micro-characters or fine prints. Also, machine-readable processing can be performed by forming barcode printing or OCR-readable characters. Also, by forming a print layer of 3a with an ink obtained by mixing black iron oxide and carbon, which can be read by MIC R, it becomes possible to read M IC R.
  • the printing layer 3 has been described with two examples of the printing layer 3a and the printing layer 3b, but the printing layer 3a itself is made of two or more types of inks having different spectral reflectances in the infrared region. However, it does not matter if the printed layer 3b is formed of two or more different types of inks that look the same color under normal light.
  • the present invention can be realized with a hue other than black.
  • yellow-green ink produced from a combination of phthalocyanine green, disazoyello, carbon black, blue lake, disazoeello
  • the yellow-green ink produced in one combination looks the same hue under normal light, but the former has a large spectral reflectance in the infrared region, and the latter has a small spectral reflectance, so that it can be suitably used in the present invention.
  • the spectral reflectance of the printing layer 3 in the visible light region be 40% or less.
  • the pearl luster of the multilayer pearl luster film can be enhanced by contacting the low-reflectivity print layer rather than by the high-reflectance print layer, enhancing the contrast with the surroundings and improving visibility. This is because it can be improved.
  • the adhesive layer 4 is further provided on the printed layer 3 for patterns and characters.
  • the adhesive of the adhesive layer 4 a well-known adhesive having a property of being activated in a drying zone of a paper machine and firmly adhering to paper is used. These adhesives are described in detail in Japanese Patent Application Laid-Open Nos. 10-010988 and 10-226969.
  • the adhesive layer may be provided on the front and back surfaces, or may be provided on the surface opposite to the surface exposed at the window opening W. Its thickness is usually about 1 to 10 m.
  • a layer having excellent light reflectivity such as a white layer or a metal deposition layer between the adhesive layer 4 and the printed layer 3 for patterns and characters, etc.
  • the slit width is usually 0.5 to 5 mm.
  • the thread having the authenticity judgment function according to the first invention of the present invention is completed.
  • this thread it is possible to visually recognize the excellent pearl luster with a clear interference color that cannot be obtained with the hue of pearl pigments, and to observe hidden characters and patterns when observed with a device that can visualize an infrared image.
  • a stealth-type (invisible) barcode can be read.
  • a second invention of the present invention is a forgery prevention paper characterized in that any one of the aforementioned threads T is exposed in a window opening W formed on the surface of the paper.
  • Any of the conventionally proposed methods can be used for the manufacture of this window-preventing thread type anti-counterfeit paper. Since the sled is exposed at the window opening W, it can absorb infrared light when it is observed indoors by irradiating infrared light and capturing it with a CCD or other camera capable of detecting infrared light and outputting the image to a CRT. It is possible to clearly read the printed layer 3a such as a design or a character having a pattern. Since the thread extends between the paper windows between the window windows, the printed layer 3a in this area (tunnel) is not clear but can be seen. This indicates that to a certain extent the infrared rays can enter the inside of the paper layer.
  • Example 1 Example of manufacturing a thread having an authenticity judgment function
  • the film was a multilayer pearl luster film having a thickness of 17; A / PET / PMMA having a thickness of 17; m and a width of 52 mm.
  • polyester heat-sensitive adhesive (trade name "Vylon", Toyobo Co., Ltd. granulation) a fluorescent dye 0.5 wt% added to paint the 5 gZm 2 (Drying equivalent) of Chiofen system by applying thermal An adhesive coating layer 4 (see FIG. 1) was formed. Then, using a micro-slider, the characters were slit so that the characters were located at the center of the thread, and a 2.4 mm wide thread was manufactured.
  • the thread with the authenticity determination function was irradiated with infrared light (using LEDs) with a wavelength of 880 nm in a dark room, and the image was output to a CRT using a CCD video camera that can also detect infrared light.
  • the micro letter “Y” could be clearly read (see Figure 10).
  • Example 2 Example of manufacturing forgery prevention paper
  • ⁇ 20 parts by weight and 80 parts by weight of LBKP are beaten into 350 m 1 CSF freeness, 10 parts by weight of clay, paper strength agent (trade name “Polystron 191”, Arakawa Chemical Co., Ltd.) 0.3 Parts by weight, sizing agent (trade name “Size Pine E”, manufactured by Arakawa Chemical Industry Co., Ltd.) 1.0 parts by weight and an appropriate amount of a sulfate band were added to prepare a stock.
  • a large number of molds consisting of rectangular resin plates with a short side of 10 mm, a long side of 25 mm, and a thickness of 0.3 mm are placed on the upper screen (width: 1300 mm) of the round cylinder of the round paper machine using an adhesive. They were continuously attached at 5 mm intervals in the flow direction. Six rows were installed at equal intervals in the width direction of the upper net.
  • the window opening can be formed in the paper layer on the surface of the upper net by using a mold made of a resin plate attached to the upper net.
  • a black light (ultraviolet light) was installed at the position of the coach roll to irradiate the wet paper with ultraviolet light. If the thread exposed at the window opening of the paper appears blue-white due to the irradiation of ultraviolet light, it means that the thermal adhesive coating layer containing the fluorescent dye on the back of the thread is exposed. Cut off the thread After reversing the front and back sides, an operation of inserting again was performed. By performing this operation until the thread no longer develops color by irradiation with ultraviolet light, a normal thread insertion state can be obtained. Subsequently, the wet paper was dehydrated according to a conventional method, and then dried with a cylinder drier to produce a double-layered laminated paper with anti-counterfeit paper with a window thread of the present invention.
  • This anti-counterfeit paper is illuminated with infrared light (using LEDs) with a wavelength of 880 nm in a dark room, captured with a CCD video camera that can also sense infrared light, and output to a CRT.
  • infrared light using LEDs
  • CCD video camera that can also sense infrared light
  • output to a CRT the microphone mouth letters of "SECUR I TY" could be clearly read. Micro-letters could not be seen clearly in the thread part of the tunnel that was sunk into the tunnel.
  • the thread of the present invention having an authenticity judgment function, and the anti-counterfeit paper using the same have the following effects.
  • the thread having the authenticity judgment function of the present invention can be suitably used for anti-counterfeit paper.
  • the anti-counterfeit paper using the same can be suitably used for banknotes, checks, stock certificates, bonds, gift certificates, cards, confidential documents, passports, identification cards, security tags, labels, and the like.

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Abstract

Un fil présentant la fonction d'évaluer une authenticité combinant un type de phénomène métallique dans la région de la lumière visible et dans la région de l'infrarouge grâce à un film lustrant nacré multicouche, ainsi qu'une feuille anti-contrefaçon utilisant ce fil. Il est fourni un fil présentant la fonction d'évaluer une authenticité sur un côté du film lustrant nacré multicouche (1) présentant la fonction de transmettre à la fois la lumière visible et les rayons infrarouges, une couche d'impression (3a) de motifs, de caractères et autres présentant la fonction d'absorber les rayons infrarouges, une couche d'impression (3b) de motifs, de caractères et autres présentant la fonction de réfléchir les rayons infrarouges et une couche adhésive (4). La couche d'impression (3a) de motifs, de caractères et autres présentant la fonction d'absorber les rayons infrarouges et la couche d'impression (3b) de motifs, de caractères et autres présentant la fonction de réfléchir les rayons infrarouges apparaissent être de la même couleur sous une lumière normale mais montrent un pouvoir réfléchissant spectral différent dans la région de l'infrarouge.
PCT/JP2004/007021 2004-05-18 2004-05-18 Fil présentant la fonction d'évaluer une authenticité et feuille anti contrefaçon l'utilisant WO2005110766A1 (fr)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2553134A (en) * 2016-08-25 2018-02-28 De La Rue Int Ltd A security booklet

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03208634A (ja) * 1989-10-31 1991-09-11 Mearl Corp:The 真珠光沢性ラミネートフイルム
JP2003306897A (ja) * 2002-04-18 2003-10-31 Tokushu Paper Mfg Co Ltd 真贋判定機能を有するスレッド、及びそれを使用した偽造防止用紙

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03208634A (ja) * 1989-10-31 1991-09-11 Mearl Corp:The 真珠光沢性ラミネートフイルム
JP2003306897A (ja) * 2002-04-18 2003-10-31 Tokushu Paper Mfg Co Ltd 真贋判定機能を有するスレッド、及びそれを使用した偽造防止用紙

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2553134A (en) * 2016-08-25 2018-02-28 De La Rue Int Ltd A security booklet
GB2553134B (en) * 2016-08-25 2020-01-08 De La Rue Int Ltd A security booklet

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