JP7314643B2 - Method for producing threaded printed matter and anti-counterfeit paper, and roll film printed matter and anti-counterfeit paper - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thread capable of visually recognizing a pattern such as microcharacters used for anti-counterfeiting purposes, and anti-counterfeiting paper in which the thread is made into paper.

2. Description of the Related Art Conventionally, anti-counterfeit paper in which a thin band-like thread is formed on a part of the paper is used in security products such as securities, passports, and ID cards that require high anti-counterfeiting properties. As a result, it becomes difficult to make a color copy on paper, or to reproduce an image by scanning it with a scanner and printing it. In order to enhance the anti-counterfeiting effect, the threads can be subjected to various processing such as micro-character printing processing, hologram processing, metal vapor deposition processing, magnetic information recording processing, and addition of fluorescent coloring function. Of these, in order to create a thread involving metal deposition processing that is also used for foreign banknotes, for example, as described in Patent Document 1, it is necessary to undergo a complicated process (demetallizing process) in which areas other than the pattern portion such as microcharacters are masked in advance, metal such as aluminum is vacuum-deposited only on the pattern portion, and then the mask printing is washed away.

In addition, as in Patent Document 2, when manufacturing a thread-like printed matter in which a colored pattern is provided by printing on a light-transmitting substrate without using metal vapor deposition, there is no vacuum vapor deposition process or cleaning process, which is advantageous in terms of manufacturing cost and lead time. On the other hand, when a pattern colored with a solvent-based colored ink is printed on a base material, a transparent protective layer having durability, chemical resistance, etc. should be provided on the upper layer in order to prevent deterioration of the pattern due to rubbing or moisture absorption. However, in this case, the solvent of the printing ink provided as the protective layer may attack the ink forming the colored pattern, making the pattern invisible as intended.

Japanese Patent No. 3279212 Japanese Patent No. 4736840

The present disclosure has been made in view of such circumstances, and an object thereof is to provide a thread-like printed matter and anti-counterfeit paper having an anti-counterfeiting effect, and a method for manufacturing roll film printed matter and anti-counterfeit paper, which can be manufactured at a low cost by a simple process.

The thread-like printed material according to the present embodiment is a thread-like printed material for being incorporated into anti-counterfeit paper, and comprises a substrate, a partial pattern formed on one surface of the substrate containing colored ink, and a fluorescent printing layer provided so as to cover the pattern, wherein the colored ink forming the pattern contains an isocyanate-based curing agent, and the fluorescent ink forming the fluorescent printing layer contains a fluorescent pigment, a resin-based binder, and a curing agent. The pattern is visible from either side of the one surface of the substrate and the other surface opposite thereto.

Further, the anti-counterfeit paper according to the present embodiment is produced by inserting the thread-like printed material into paper.

Further, in the forgery-preventive paper according to another aspect of the present embodiment, the entire thread-like printed material may be embedded in the paper, or part of the thread-like printed material may be embedded in the paper and another part of the thread-like printed material may be exposed from the paper.

The method for producing a roll film printed matter for producing a thread-shaped printed matter according to the present embodiment includes the steps of preparing a transparent film-like substrate, colored ink containing an isocyanate-based curing agent, and fluorescent ink containing a fluorescent pigment, a resin-based binder, and a curing agent; printing the colored ink on one surface of the film-like substrate to partially form a pattern, and then drying the pattern; and a step of printing the fluorescent ink to form a fluorescent print layer, and then drying it.

Further, in the method for manufacturing a roll film printed matter according to another aspect of the present embodiment, the colored ink may be printed while containing a first solvent, the fluorescent ink may be printed while containing a second solvent different from the first solvent, and the boiling point of the second solvent may be lower than the boiling point of the first solvent.

Further, a method for manufacturing a roll film printed matter according to another embodiment of the present invention may include a step of slitting the roll film printed matter manufactured by the method for manufacturing a roll film printed matter to prepare a threaded printed matter, and a step of forming the threaded printed matter into paper to prepare anti-counterfeiting paper.

According to the present embodiment, it is possible to provide a method for manufacturing a thread-like printed matter and anti-counterfeit paper having anti-counterfeiting effects, and a roll film printed matter and anti-counterfeit paper, which can be manufactured at low cost through simple steps.

FIG. 3 is a cross-sectional view for explaining the configuration of a thread-like printed matter according to the first embodiment; FIG. 2 is a plan view for explaining the configuration of a thread-like printed matter corresponding to FIG. 1; 1 is a schematic diagram for explaining the configuration of a roll film printed matter according to a first embodiment; FIG. 1A and 1B are a plan view and a cross-sectional view illustrating the configuration of an anti-counterfeit sheet according to the first embodiment; FIG. 8A and 8B are a plan view and a cross-sectional view illustrating the configuration of an anti-counterfeit paper according to a modification; 8A and 8B are a cross-sectional view and a plan view illustrating the configuration of a thread-like printed matter according to a second embodiment; FIG.

Hereinafter, with reference to drawings and the like, an example of a method for manufacturing a thread-like printed matter and anti-counterfeit paper, and a roll film printed matter and anti-counterfeit paper of the present disclosure will be described. However, the method of manufacturing the thread-like printed matter and anti-counterfeiting paper, and the roll film printed matter and anti-counterfeiting paper of the present disclosure are not limited to the embodiments and examples described below.

In addition, each figure shown below is shown typically. Therefore, the size and shape of each part, the thickness of each layer in cross-sectional views, and the like are exaggerated as appropriate for easy understanding. In each figure, hatching indicating cross sections of members is omitted as appropriate. Numerical values such as dimensions and material names of each member described in this specification are examples as an embodiment, and are not limited to these, and can be appropriately selected and used. In this specification, terms specifying shapes and geometrical conditions, such as parallel, orthogonal, perpendicular, etc., are intended to include substantially the same states as well as strictly defined terms. Also, for convenience of explanation, the terms "upper" and "lower" are sometimes used, but the vertical direction may be reversed, and the same applies to the horizontal direction.

1. First Embodiment of Present Disclosure A first embodiment of a method for manufacturing a thread-like printed matter and anti-counterfeit paper, and a roll film printed matter and anti-counterfeit paper of the present disclosure will be described. FIG. 1 is a cross-sectional view illustrating the configuration of a thread-like printed material 1 according to the first embodiment of the present disclosure. FIG. 2 is a plan view of the thread-like printed matter 1 as viewed from above the page of FIG. FIG. 1 is a cross-sectional view of the thread-like printed matter 1 of FIG. 2 cut along the center line in the vertical direction of the page. 3A and 3B are schematic diagrams for explaining the roll film printed matter 3, which is the basis for forming the threaded printed matter 1 of the present embodiment. FIG. 3A is a plan view of the roll film printed matter 3 in a film state, and FIG. FIG. 3(c) is a perspective view showing an image of the unprinted roll film 2 before becoming the roll film print 3. FIG. The configuration of the thread-like printed matter 1 will be described below.

(a) Thread-like Printed Material As shown in FIG. 1, the thread-like printed material 1 has a structure in which a pattern 40 is formed on one side of a base material 10 provided with a surface-treated surface-treated portion 20, and further has a structure in which a fluorescent printed layer 30 is formed on one side of the base material 10 on which the pattern 40 is formed, including areas where the pattern 40 is not formed. The pattern 40 includes, for example, black colored ink, and is a combination of micro-characters, small symbols, figures, etc., which can be visually recognized from the outside with the naked eye or through a magnifying glass or the like. In addition, in the example of FIG. 1, the fluorescent print layer 30 is arranged as a layer that produces fluorescent colors different from those of the first fluorescent print layer 31 and the second fluorescent print layer 32 . Each configuration of the thread-like printed matter 1 will be described in detail below.

(i) Substrate The substrate 10 has transparency, and the pattern 40 formed with colored ink formed on one surface of the substrate 10 is preferably visible from both the one surface and the other surface opposite thereto with the naked eye or through a magnifying glass. As the substrate 10, such a resin film having a certain degree of transparency, water resistance and heat resistance can be used. Examples include polyester resin films such as polyethylene terephthalate (PET) resin films, polyamide resin films, polyimide resin films, polycarbonate resin films, polystyrene resin films, polypropylene resin films, polysulfone resin films, polyphenylene sulfide resin films, cellulose resin films, and the like. The thickness of the base material 10 is arbitrary, but in consideration of processability, durability, etc., the thickness can be, for example, 1 μm or more and 300 μm or less, preferably 5 μm or more and 50 μm or less. The substrate 10 may be colored in a chromatic color as long as it has a certain degree of transparency as described above.

Since the pattern 40 and the fluorescent print layer 30 are formed on one of the front and back surfaces of the base material 10, it is desirable to improve the surface quality of the base material 10 by applying corona discharge irradiation, i.e., corona treatment, to one surface of the base material 10 immediately before printing. Thereby, the adhesion of the pattern 40 and the fluorescent print layer 30 to the substrate 10 can be improved. In addition to the corona treatment, a similar effect can be expected by applying an easy-adhesion treatment such as applying a primer to one surface of the substrate 10 .

(ii) Colored Ink Pattern As shown in FIGS. 1 and 2, on one surface of the base material 10 provided with the corona-treated surface-treated portion 20, a black ink pattern 40 consisting of letters "ABC" is formed by printing, as an example. The colored ink in the present disclosure refers to an ink obtained by adding a pigment or dye as a coloring agent to a resin binder, which can produce a contrast with the base material 10 to such an extent that the pattern formed on the base material 10 can be visually recognized with the naked eye or a magnifying glass. As a method for printing this on the substrate 10, a known printing method such as gravure printing, offset printing, flexographic printing, silk screen printing, or inkjet coating can be used. In the present embodiment, the pattern 40 is printed on the substrate 10 by gravure printing from the viewpoints of the clarity and shape stability of the pattern of microcharacters, suitability of ink, and the like.

The characters "ABC" of the pattern 40 of the present embodiment can be visually recognized as a normal image of the characters "ABC" as they are in the character string on the left side of the page of FIG. The pattern 40 of the thread-like printed matter 1 can be visually recognized from both sides of the anti-counterfeiting paper that is embedded in the paper material, so that the pattern 40 can be read from either side. However, it is not necessary to consider that the pattern 40 can be read from both sides. In addition, using characters as the pattern 40 is merely an example, and arbitrary characters, numbers, symbols, graphics, or a combination thereof may be used.

Colored inks used in gravure printing are composed of colorants, resin binders, solvents, hardeners and other additives. A dye, an organic pigment, or an inorganic pigment is used as the colorant. Examples of organic pigments include azo, perylene, perinone, phthalocyanine, quinacridone, anthraquinone, thioindigo, dioxazine, isoindolinone, and quinophthalone pigments. Examples of inorganic pigments include carbon black, titanium oxide, barium sulfate, zinc oxide, zinc sulfide, calcium carbonate, chromium oxide, silica, red iron oxide, mica (mica), and aluminum.

By appropriately selecting these coloring agents, not only yellow, red, indigo, black ink, etc., but also lustrous colors such as gold and silver, and pearl inks can be used. In addition to having absorbency in the visible light region, the coloring agent may be added with an ultraviolet absorber or an infrared absorber so that the pattern can be recognized by an ultraviolet or infrared sensor, a camera, or the like in addition to visual visibility. Furthermore, the pattern 40 may be composed of a combination of characters, symbols, etc. of multiple colors. In the present embodiment, carbon black, which is an inorganic pigment, is used to develop a black ink (black) color that provides a good contrast with the substrate 10 having transparency.

As the resin binder, those commonly used as gravure inks can be applied, and examples thereof include ethylene-vinyl acetate copolymer resins, vinyl acetate resins, polyamide resins, acrylic resins, polyester resins, polyurethane resins, polyurethane urea resins, chlorinated polypropylene resins, polyvinyl chloride resins, alkyd resins, rosin-based resins, rosin-modified maleic acid resins, chlorinated rubber, butyral, ketone resins, and the like. These resins can be used alone or in combination of two or more. In addition, those having an amino group, a hydroxyl group, a carboxyl group, or the like capable of causing a crosslinking reaction with an isocyanate-based curing agent, which will be described later, are preferable.

Examples of the solvent include organic solvents that are commonly used as gravure inks. Examples include aromatic organic solvents such as toluene and xylene, ketone solvents such as acetone, methyl ethyl ketone, and methyl isobutyl ketone, ester solvents such as ethyl acetate and butyl acetate, and alcohol solvents such as n-propanol, inopropanol, n-butanol, and propylene glycol monomethyl ether. These solvents can be used alone or in combination of two or more. In this embodiment, a solvent having a higher boiling point than the solvent contained in the fluorescent ink, which will be described later, is used. Specifically, ethyl acetate (boiling point of approximately 70.4° C.) is used for the ink forming the fluorescent print layer 30 in contrast to toluene (boiling point of approximately 111° C.) contained in the colored ink forming the pattern 40.

In addition, the colored ink contains an isocyanate-based curing agent to accelerate the curing of the pattern 40 after printing. Examples of isocyanate-based curing agents include tolylene diisocyanate, diphenylmethane diisocyanate, trimethylhexamethylene diisocyanate, isophorone diisocyanate, hexamethylene diisocyanate, and xylene diisocyanate. Moreover, these can be used individually or in mixture of 2 or more types. As a result, the shape stability, durability, etc. of the pattern 40 printed with colored ink can be obtained, and adverse effects on the pattern 40, including solvent attack during the formation of the fluorescent print layer 30, which will be described later, can be suppressed.

The isocyanate curing agent contained in the colored ink is preferably 1 part or more and 10 parts or less per 100 parts of the ink portion other than the curing agent of the colored ink. When the curing agent is within this range, the colored ink forming the pattern 40 can improve fixability to the substrate 10 when the solvent evaporates during the drying process in the heat drying oven. Further, after that, when completely cured, the solvent resistance is also improved.

Whether or not the colored ink forming the pattern 40 contains an isocyanate curing agent can be easily determined by using FT-IR (Fourier transform infrared spectroscopy). For example, an FT-IR measurement device (Nicolet 6700) or the like can be used for measurement under the conditions that the measurement method is the ATR method (microscope) and the number of integrations is 64. Since the wavelength of the isocyanate group is about 2270 cm ⁻¹ , the presence or absence of the isocyanate group in the curing agent can be determined by checking the presence or absence of this peak.

Specifically, when a pigment-based colorant is used, an ink containing a colorant composed of approximately 5 to 15 parts of a pigment component, approximately 10 to 20 parts of a resin binder, a slight amount of an auxiliary agent, and a solvent, and a curing agent ink composed of approximately 60 to 80 parts of a resin binder, approximately 0.1 to 1.0 part of an isocyanate-based curing agent, and a curing agent ink and other solvents are added to 100 parts of the ink containing the coloring agent. A colored ink is produced by mixing so that the ink is about 1 part or more and 7 parts or less. In addition, the thickness of the pattern 40 formed on the surface of the substrate 10 can be, for example, 0.3 μm or more and 5.0 μm or less.

(iii) Fluorescent Print Layer As shown in FIGS. 1 and 2, a fluorescent print layer 30 composed of regions of two types of fluorescent ink is formed so as to cover the entire pattern 40 of colored ink printed on one surface of the substrate 10 provided with the surface-treated surface-treated portion 20. In the figure, the first fluorescent printed layer 31, which is a two-color fluorescent printed layer, and the second fluorescent printed layer 32 having different light emission characteristics are illustrated, but in this embodiment, as described later, the fluorescent printed layers of three colors are formed in a frame-sequential manner. However, the number of ink colors that the fluorescent print layer 30 has is not limited to this, and a large number of colors of four or more colors can be divided and used. The fluorescent print layer 30 is formed on the base material 10 by a known printing method such as gravure printing, offset printing, flexographic printing, silk screen printing, inkjet coating, or the like, using ink obtained by adding a fluorescent pigment, a curing agent, or the like that is excited by irradiation with light of a specific wavelength and emitting visible light to a solvent and a resin binder.

The fluorescent print layer 30 preferably has transparency to the extent that it does not hinder the visibility of the pattern 40 formed by colored ink previously printed on the surface of the base material 10. For example, the transmittance of visible light having a wavelength of 380 nm or more and 780 nm or less is preferably 20% or more. The fluorescent print layer 30 contains, for example, a fluorescent pigment that emits light in a specific color in a specific visible light wavelength region when excited by ultraviolet irradiation, instead of a coloring agent used in normal printing ink. It is desirable to have the same transmittance as above for the transparency at the time of light emission in the specific visible light wavelength region when excited by ultraviolet irradiation.

As a phosphor used for such a fluorescent pigment that emits fluorescence when irradiated with ultraviolet rays, it is possible to select either an inorganic phosphor or an organic phosphor depending on the color to be emitted. Examples of inorganic phosphors that emit red light include _Y2O3 :Eu, _YVO4 :Eu, 3.5MgO, 0.5mgF, _2GeO2 :Mn _, (Y,Gd) _Bo3 :Eu, and Y(P,V) _O4 :Eu.緑色光を発光する無機蛍光体としては、例えば、ＺｎＯ：Ｚｎ、Ｚｎ ₃ ＳｉＯ ₂ ：Ｍｎ、Ｚｎ ₃ Ｓ：Ｃｕ，Ａｌ、（Ｚｎ，Ｃｄ）Ｓ：Ｃｕ，Ａｌ、ＺｎＳ：Ｃｕ，Ａｕ，Ａｌ、Ｚｎ ₂ ＳｉＯ ₄ ：Ｍｎ、ＺｎＳ：Ａｇ，Ｃｕ、（Ｚｎ，Ｃｄ）Ｓ：Ｃｕ、ＺｎＳ：Ｃｕ、Ｇｄ ₂ Ｏ ₂ ：Ｔｂ、Ｌａ ₂ Ｏ ₂ Ｓ：Ｔｂ、Ｙ ₂ ＳｉＯ ₅ ：Ｃｅ，Ｔｂ、Ｚｎ ₂ ＧｅＯ ₄ ：Ｍｎ、ＣｅＭｇＡｌ ₁₁ Ｏ ₁₃ ：Ｔｂ、ＳｒＧａ ₂ Ｓ ₄ ：Ｅｕ ²⁺ 、ＺｎＳ：Ｃｕ，ＣＯ、ＭｇＯ・ｎＢ ₂ Ｏ ₃ ：Ｃｅ，Ｔｂ、ＬａＯＢｒ：Ｔｂ，Ｔｍ、Ｌａ ₂ Ｏ ₂ Ｓ：Ｔｂ、ＺｎＳ：Ｃｕ（Ｍｎ）等が挙げられる。 Examples of _inorganic phosphors that emit blue _light include ZnS:Ag, _CaWO4 , _Y2SiO5 :Ce, ZnS:Ag, Ga, Cl, _Ca2B5O3Cl : ^Eu2+ _{, BaMgAl14O23} : ^Eu2+ _, and _Sr3 ( _PO2 ) _3Cl :Eu.

On the other hand, examples of organic phosphors include diaminostilbene disulfonic acid derivatives, imidazole derivatives, coumarin derivatives, triazole, carbazole, pyridine, naphthalic acid, derivatives such as imidazolone, dyes such as fluorescein and eosin, and compounds having a benzene ring such as anthracene.

Many of ordinary fluorescent inks do not contain a resin binder and are composed only of a solvent and a fluorescent pigment so as not to impede the fluorescent coloring property. However, in this embodiment, as will be described later, in order to suppress the melting of the fluorescent print layer due to the heat sealing process performed in the process of inserting the thread-like printed material into the paper, the colored ink forming the pattern 40 is colored. A resin binder is added to contain an isocyanate-based curing agent. As the resin binder, the various resins exemplified as the resin binders for the colored inks described above can be used singly or in combination of two or more.

As the solvent, the same solvents as those used for the colored inks described above can be used. However, in this embodiment, ethyl acetate, which has a boiling point lower than that of toluene contained in the colored ink, is used. Also, like the colored inks, the fluorescent inks contain an isocyanate-based curing agent similar to that described above to accelerate the curing of the fluorescent print layer 30 after printing.

Specifically, the proportions of the four types of fluorescent ink, resin binder, solvent, and curing agent, which form the fluorescent printing layer 30, are about 5 to 55 parts for the resin binder, about 1 to 10 parts for the curing agent ink, and 5 to 55 parts for the solvent, with respect to 100 parts of the fluorescent ink. It is particularly preferable that the resin binder contained in the ink of the fluorescent printing layer is 10 parts or more and 50 parts or less with respect to 100 parts of the fluorescent ink. The proportions of each of the four materials constituting the fluorescent ink are as follows. The fluorescent ink is composed of about 10 to 20 parts of fluorescent pigment and about 80 to 90 parts of solvent (when the total number of parts is 100 parts). The resin binder is composed of about 15 to 25 parts of resin (for a total of 100 parts) and solvent. When the total number of parts is 100, the curing agent ink is composed of about 0.1 to 0.5 parts of an isocyanate curing agent, about 65 to 85 parts of a resin, and a solvent. Within this range, inhibition of ultraviolet absorption and fluorescence color development of the fluorescent pigment can be suppressed, and the presence of the resin binder enables effective addition of the curing agent.

The fluorescent printed layer 30 formed in this manner is irradiated with a commercially available compact black light that emits ultraviolet light with a wavelength of 365 nm, for example, and in FIGS. Then, through each of the first fluorescent printed layer 31 and the second fluorescent printed layer 32, the pattern 40 formed by the colored ink of the base can be visually recognized. For example, when the first fluorescent printed layer 31 fluoresces red and the second fluorescent printed layer 32 fluoresces green when irradiated with ultraviolet light, the letters "ABC" of the pattern 40, which are black micro-characters, can be seen from both the front and back sides of the thread-like printed material 1 through the fluorescent printed layer 30, which fluoresces red or green.

The size of the micro-characters printed as the pattern 40 is not particularly limited, but it is necessary to consider how the pattern 40 looks when the fluorescent print layer 30 is illuminated with ultraviolet light and when it is not, and the color difference between the character color of the pattern 40 and the fluorescent color. When visual confirmation is assumed, the character size is generally 2 points or more and 14 points or less, and when using a magnifying glass or the like, the character size is preferably 0.25 points or more. One point is approximately 0.35 mm.

Further, layers such as the first fluorescent printed layer 31 and the second fluorescent printed layer 32 that emit different fluorescent colors when irradiated with ultraviolet rays may be provided in association with the characters of the pattern 40 . For example, the area corresponding to the letter "A" of the pattern 40 is made to fluoresce red, the area corresponding to the letter "B" is made to fluoresce green, and the area corresponding to the letter "C" is made to fluoresce blue.

(iv) Features of thread-like printed matter of the present embodiment When the thread-like printed matter 1 of the present embodiment is incorporated into paper or the like, in an environment exposed to normal visible light, the pattern 40 such as micro-characters colored in black ink on the transparent substrate 10 can be clearly seen from either the front or back of the paper with the naked eye or with a magnifying glass. In addition, since the transparent fluorescent print layer 30 is formed so as to entirely cover the pattern 40, the pattern 40 is sandwiched between the transparent base material 10 and the transparent fluorescent print layer 30. As a result, both surfaces of the pattern 40 are protected by the base material 10 and the fluorescent print layer 30, and deterioration in visibility, discoloration, and deterioration of the pattern 40 due to rubbing, humidity, and the like are suppressed.

The pattern 40 is printed after the surface portion of the base material 10 has been subjected to an easy-adhesion treatment such as corona treatment or primer coating, so that the adhesion of the colored ink to the base material 10 can be improved. In addition, the adhesion of the fluorescent printed layer 30 printed on the upper layer of the pattern 40 to the substrate 10 can also be improved.

Furthermore, the solvent contained in the fluorescent ink, resin binder, and curing agent ink forming the fluorescent printing layer has a lower boiling point than the solvent contained in the colored ink forming the pattern 40 . As a result, in the process of drying the colored ink, the solvent of the fluorescent print layer printed on the upper layer is attacked, preventing curing and preventing the pattern 40 from becoming unclear.

Further, as described above, when the thread-like printed matter 1 of the present embodiment is irradiated with, for example, a commercially available compact black light that emits ultraviolet rays with a wavelength of 365 nm, the visibility of the pattern 40 such as micro-characters in black ink is not hindered, and the fluorescent printed layer 30 can fluoresce in a single color or in a plurality of regions in a plurality of regions, thereby contributing to effective authentication determination.

The thread-like printed material 1 of this embodiment has the advantage that it can be manufactured at a low cost by a simple process without going through complicated processes such as printing with water washing ink before vapor deposition and cleaning and removing mask printing after vapor deposition, and has a high anti-counterfeiting effect, as compared with the conventional method of performing a demetallizing process in which pattern portions such as microcharacters are formed by vapor deposition of metal such as aluminum. In addition, it has the advantage that the thread-like printed material 1 for anti-counterfeiting with high durability and reliability can be formed by suppressing the material cost and complication of the process, such as sandwiching with a plurality of transparent films, and by simply providing the pattern 40 and the fluorescent printed layer 30 by two types of printing on the base material 10.

(b) Manufacturing Method of Roll Film Printed Material Next, a manufacturing method of the roll film printed material 3, which is the basis of the thread-like printed material 1, will be described. The thread-like printed material 1 as shown in FIGS. 1 and 2 can be obtained by slitting the roll film printed material 3 as shown in FIGS. A method for manufacturing the roll film printed matter 3 will be briefly described below.

(i) Formation of Pattern on Roll Film As the substrate 10, the roll film 2 in the form of a roll made of the above-described transparent material is prepared. On this, for example, by gravure printing, colored ink having the composition described above is used to print the pattern 40 in a form in which the pattern 40 is repeatedly arranged vertically and horizontally. Immediately before printing, in order to improve the adhesion of the pattern 40 and the fluorescent print layer 30 to the roll film 2, the surface to be printed of the roll film 2 is subjected to an easy-adhesion treatment such as corona treatment or primer coating. In the case of corona treatment, it is preferable to convey the roll film 2 at a feed speed of about 10 m/min or more and 20 m/min or less. For the pattern 40, a plurality of different color inks may be prepared, and patterns of different colors may be arranged.

The gravure printing of the colored ink for forming the pattern 40 is performed at a speed of about 20 m/min to 40 m/min, and immediately after that, the solvent is volatilized through a heat drying oven with a section of 1 m or more at a temperature of 100 ° C. or more to cure the ink. The same is true when printing multiple colors.

(ii) Forming a fluorescent printed layer on the roll film After the pattern 40 is printed and thermally cured, the printed roll film printed matter 3 is gravure-printed with the above-described material composition on the same line or on another line. The fluorescent print layer 30 is also printed at a speed of about 20 m / min to 40 m / min as in gravure printing of colored ink, and immediately after that, the solvent is passed through a heat drying oven with a temperature of 100 ° C. or more and a section of 1 m or more. Volatilize the ink and cure the ink. In FIGS. 3A and 3B, the fluorescent print layer 30 is formed by repeating the three-color configuration of the first fluorescent print layer 31, the second fluorescent print layer 32, and the third fluorescent print layer 33 in a frame-sequential manner. However, it is not limited to this. These may be those that develop red, green, and blue, respectively, or other colors when irradiated with ultraviolet rays, for example. Alternatively, a region that fluoresces when irradiated with ultraviolet rays and a region that does not fluoresce may be arranged. Thus, the roll film printed material 3 on which the pattern 40 and the fluorescent print layer 30 are formed is taken up as a take-up 4 and stored, transported, or used in subsequent processes.

(c) Method for manufacturing anti-counterfeiting paper Next, a method for manufacturing anti-counterfeiting paper by slitting the printed roll film 3 into thread-like printed matter 1 and inserting it into a paper material will be described. First, one of the front and back sides of the roll film printed matter 3 is heat-sealed. In this method, an adhesive that melts and softens by heating is applied in advance to the roll film printed matter 3 before slitting so that the threaded printed matter 1 is firmly adhered to the paper material. Examples of adhesives include known materials such as polyvinyl chloride resins, polyvinyl acetate resins, polyester resins, ethylene-vinyl acetate copolymer resins, polyvinyl alcohol resins, and polyacrylate resins. A heat seal layer is formed on the surface of the roll film printed material 3 by using a well-known coating machine such as gravure printing using such an adhesive alone or in combination. The coating amount is, for example, about 0.1 to 10 g/m ² in terms of dry mass.

After that, the roll film printed matter 3 is slit into narrow widths by a micro slitter. The width of the slit thread-like printed material 1 can be arbitrarily set depending on the application, but can be set to a width of 1 mm or more and 15 mm or less, for example.

Next, the thread-like printed matter 1 is made into paper by using a known method of making into a paper material, thereby manufacturing anti-counterfeiting paper. FIG. 4(a) shows a plan view of anti-counterfeit paper 5 in which the front and back surfaces of thread-like printed matter 1 are covered with paper material 6, and FIG. FIG. 5(a) shows a plan view of anti-counterfeit paper 5A in which the front and back of thread-like printed matter 1 are covered with paper material 6 with intermittent windows partially open, and FIG.

As described above, the fluorescent printed layer 30 provided on the thread-like printed material 1 emits light of visible light wavelengths when irradiated with ultraviolet rays, etc., so the paper material 6 preferably does not contain a fluorescent whitening agent. This is because, if the paper material 6 contains a fluorescent brightening agent, it develops a purple or blue color when irradiated with ultraviolet rays, and if it mixes with the coloring of the fluorescent printing layer 30, the originally expected fluorescent coloring may not be obtained.

In the anti-counterfeit paper 5 shown in FIGS. 4( a ) and 4 ( b ), the entire thread-like printed matter 1 is embedded in the paper material 6 . Such anti-counterfeiting paper can be produced by inserting a nozzle into the flow of paper material in the sliced portion of a fourdrinier paper machine, feeding the thread-like printed matter 1 while water is flowing through the nozzle, and inserting the thread-like printed matter 1 into the paper web formed on the paper machine (Japanese Patent Application Laid-Open No. 51-130309). In the anti-counterfeit paper 5, the transparent base material 10 is arranged on one side on which the pattern 40 is formed, and a heat seal layer 66 may be formed on the outer side, that is, on the lower side in FIG. 4(b). By forming this heat seal layer, the adhesion between the lower paper portion 62 of the paper material 6 and the thread-like printed matter 1 can be strengthened. On the other side on which the pattern 40 is formed, the first fluorescent printed layer 31, the second fluorescent printed layer 32, and the third fluorescent printed layer 33, which are the fluorescent printed layers 30, are arranged. The heat seal layer may be formed only on one side of the thread-like printed material 1 that penetrates the paper, or may be formed on both sides.

In this way, the front and back surfaces of the thread-like printed matter 1 are sandwiched between the upper paper portion 61 and the lower paper portion 62 of the paper material 6, making it difficult to take out only the thread-like printed matter 1. This enhances the anti-counterfeiting effect and reduces the risk of damage and deterioration of the thread-like printed matter 1. The paper materials of the upper paper layer portion 61 and the lower paper layer portion 62 of the paper material 6 are preferably 30 g/m ² or more and 65 g/m ² or less. This is because when the paper material of the paper material 6 is within this range, the visibility of the pattern 40 and the like of the thread-like printed matter 1 can be ensured while the effect of protecting the thread-like printed matter 1 is obtained.

(d) Modified Example of Manufacturing Method of Anti-Counterfeit Paper In the anti-counterfeit paper 5A according to the modified example shown in FIGS. Such a method for manufacturing anti-counterfeiting paper is also known as a method for manufacturing "windowed thread-filled paper". For example, a groove is provided at the tip of the convex part of a guide having uneven parts, and with the thread-like printed material 1 inserted in this groove part, the guide is embedded in the stock suspension on the wire of the fourdrinier paper machine, and when the water in the stock suspension is dewatered downward from the wire and the paper layer is almost formed, the guide is moved upward, and the part in contact with the tip of the convex part of the guide forms a window opening where the thread-like printed material 1 is exposed (Japanese Patent Publication No. 5-85680). Alternatively, a rotating drum with a built-in compressed air nozzle is installed on the wire of a fourdrinier paper machine, and the compressed air is intermittently blown from the compressed air nozzle in the rotating drum to the wet paper on the wire in which the thread-like printed material 1 is inserted to blow off the slurry on the thread-like printed material 1, thereby intermittently forming a window opening where the thread-like printed material 1 is exposed (JP-A-6-272200).

In the anti-counterfeit paper 5A, the transparent base material 10 and the lower layer paper portion 64 of the paper material 6 are arranged on one surface on which the pattern 40 is formed, and the fluorescent print layer 30 is arranged on the other surface on which the pattern 40 is formed. Furthermore, on the outer side, that is, on the upper side of FIG. 5B, the upper paper portion 63 of the paper material 6 is intermittently arranged, and at the positions where the upper paper portion 63 is not arranged, window portions 65A, 65B, and 65C are formed, and the thread-like printed material 1 can be partially directly visually recognized. Therefore, micro-characters and the like can be clearly confirmed in part, and security and design are excellent. Further, in FIG. 5B, the orientation of the thread-like printed material 1 with respect to the paper material 6 may be opposite to the vertical direction of the paper surface. That is, the thread-like printed matter 1 may be arranged so that the transparent base material 10 faces the upper paper portion 63 side and the fluorescent print layer 30 faces the lower paper portion 64 side. When arranged in this way, the part of the thread-like printed material 1 exposed through the window 65 of the paper material 6 is the base material 10, so the protection performance of the pattern 40 and the fluorescent printed layer 30 can be further enhanced. As with the anti-counterfeit paper 5, a heat seal layer 66 is formed on the outer side of the base material 10, that is, on the lower side in FIG. 5(b). By forming the heat seal layer, the adhesion between the lower paper portion 64 of the paper material 6 and the thread-like printed matter 1 can be strengthened.

2. Second Embodiment of Present Disclosure Next, a second embodiment of a method for manufacturing a thread-like printed matter and anti-counterfeit paper, and a roll film printed matter and anti-counterfeit paper of the present disclosure will be described. FIG. 6(a) is a cross-sectional view illustrating the configuration of a thread-like printed matter 1A according to the second embodiment of the present disclosure, and FIG. 6(b) is a plan view of the thread-like printed matter 1A viewed from above the page of FIG. FIG. 6(a) is a DD cross-sectional view of the thread-like printed material 1A of FIG. 6(b) cut along the center line in the vertical direction of the paper surface. Hereinafter, a method for manufacturing a thread-like printed matter and anti-counterfeit paper, and a roll film printed matter and anti-counterfeit paper according to the present disclosure will be described, focusing on differences from the first embodiment.

(a) Threaded Printed Matter As shown in FIGS. 6A and 6B, the threaded printed matter 1A is provided with surface-treated portions 21 and 22 on both sides of the substrate 11. FIG. Two types of patterns, a pattern 41 and a pattern 42, are formed on both sides of the base material 11, respectively, and the patterns 41 and 42 are arranged so as to face one side and the other side of the base material 11, respectively. That is, at the position where the character pattern 41A of "ABC", which is the pattern 41, is provided on the upper surface of the base material 11 in the paper surface of FIG. In addition, in the portion where the pattern 42A composed of symbols, which is the pattern 42, is provided on the upper surface of the substrate 11, the facing lower surface of the substrate 11 is provided with the character pattern 41B, which is the pattern 41.

FIG. 6B is a plan view of this viewed from the upper side of the base material 11, and the letters "ABC" are visible on the left side of the paper in the normal image and on the right side in the reverse image. Furthermore, square and circle symbols are arranged around the left and right characters. Further, even when the thread-like printed material 1A is viewed from the opposite side, the pattern can be visually recognized as substantially the same pattern. However, in reality, similar characters “ABC”, patterns 41A and 41B, are arranged on different front and back surfaces of the substrate 11, and patterns composed of symbols, patterns 42A and 42B, are arranged on different front and back surfaces of the substrate 11.

In this way, the patterns 41 and 42 that appear to be formed on the same surface of the base material 11 can actually be printed on different surfaces of the front and back surfaces of the base material 11, thereby further enhancing security. Further, for example, the thread-like printed material 1A can be formed such that a first pattern in which all patterns are formed only on one surface of the substrate 11 and a second pattern in which the pattern is partially dispersed and formed on one surface and the other surface of the substrate 11 are repeated regularly or irregularly. At this time, the first pattern and the second pattern may be formed to look substantially the same, or may be formed to look different.

Alternatively, a pattern may be printed on one surface of the substrate 11 with ink colored in a first color, and a pattern printed on the other surface of the substrate 11 with ink colored in a second color different from the first color. As a result, it is possible to suppress troubles such as pattern bleeding and poor drying due to non-uniformity of the printed film thickness, which are caused by overprinting of patterns with two or more colors of ink on the same surface of the base material 11. Workability can also be improved, for example, printing on the base material 11 can be divided between the front and back sides.

The composition of the colored ink used to form the substrate 11 and the patterns 41 and 42 is the same as in the first embodiment.

Also, as shown in FIG. 6A, the fluorescent printed layer is the same as in the first embodiment except that it has a fluorescent printed layer 30A formed on one surface of the base material 11, that is, the upper surface of the paper surface, and the other surface of the base material 11, that is, the fluorescent printed layer 30B formed on the lower surface of the paper surface. The fluorescent printed layer 30A is formed by sequentially arranging a first fluorescent printed layer 34 and a second fluorescent printed layer 35 having a different light emission characteristic from the first fluorescent printed layer 34, and the fluorescent printed layer 30B is also formed by a first fluorescent printed layer 36 and a second fluorescent printed layer 37 having a different light emission characteristic arranged in a frame sequential manner. Basically, the first fluorescent printed layers 34 and 36 and the second fluorescent printed layers 35 and 37, which are arranged opposite to each other on the front and back sides, preferably have the same light emission characteristics when irradiated with ultraviolet rays, but they can be made to have different light emission characteristics. The detailed composition and the like of the fluorescent print layers 30A and 30B are the same as in the first embodiment.

In the thread-like printed matter 1A of the present embodiment, as in the thread-like printed matter 1 of the first embodiment, when it is made into a paper material, the patterns 41 and 42 such as colored microcharacters on the transparent base material 11 can be clearly visually recognized with the naked eye or a magnifying glass from either the front or back side of the paper in an environment exposed to normal visible light. In addition, transparent fluorescent print layers 30A and 30B are formed so as to cover the patterns 41 and 42 entirely. As a result, the patterns 41 and 42 are protected by being sandwiched between the fluorescent print layers 30A and 30B on both sides, and the visibility of the patterns 41 and 42 is prevented from deteriorating, discoloring, and deteriorating due to friction, humidity, and the like.

Furthermore, since the patterns 41 and 42 can be printed and formed dispersedly on either the front or back surface of the base material 11, even if one side of the thread-like printed material 1A is to be scraped to erase the pattern, it is difficult to scrape the pattern printed on the other side at the same time, thereby improving security and tampering prevention.

(b) Method for manufacturing roll film, etc. The roll film on which the thread-like printed matter 1A is based can be manufactured by the same method as in the first embodiment, except that the patterns 41 and 42 are to be printed on the front and back sides of the roll film, and the fluorescent print layers 30A and 30B are also printed on the front and back sides of the roll film.

(c) Method for manufacturing anti-counterfeit paper The method for manufacturing anti-counterfeit paper, in which the printed roll film is slit into a thread-like printed material 1A, and is then made into a paper material, can be performed in the same manner as the method described in the first embodiment.

EXAMPLES Next, the present invention will be described more specifically with reference to examples. Hereinafter, unless otherwise specified, parts or percentages are based on mass.

(a) Example 1
(i) Pattern formation on roll film with colored ink As the roll film, a roll type transparent polyester film (manufactured by Toray Industries, Inc., product name: Lumirror (registered trademark)) having a width of 520 mm and a thickness of 16 μm was used, and one surface thereof was used as a surface to be printed, and corona treatment was carried out in advance at a corona output of 0.5 kW and a conveying speed of 15 m/min. About 24 hours after that, a gravure printing machine was used to repeatedly print a pattern consisting of a fixed string of letters in an array with a character size of 2.5 points (about 0.88 mm) and a character pitch of about 2.08 mm in one color of black at a printing speed of 25 m/min. The film thickness of the ink was about 1 μm.

[Colored ink (black)]
Black ink formulation Black ink 100 parts Isocyanate hardener ink 4 parts Black ink formulation Synthetic resins 15 parts Carbon black 10 parts Auxiliary less than 1 part Solvent (toluene) 75 parts Isocyanate hardener ink formulation Resin 74 parts Isocyanate 0.3 parts Solvent (toluene) 25.7 parts

(ii) Formation of fluorescent print layer on roll film On the patterned surface of the roll film, the fluorescent print layer is printed solidly so as to cover the entire pattern portion at a printing speed of 25 m / min with a gravure printing machine. The fluorescent printing ink has the property of emitting visible light with a wavelength in the blue region when irradiated with a commercially available compact black light that emits ultraviolet light with a wavelength of 365 nm. Immediately thereafter, the ink was dried by passing it through a hot drying oven with a zone of about 1 m heated at 100°C. The film thickness of the ink was about 1 μm.

[Ink for fluorescent printing layer (blue)]
Formula of ink for fluorescent printing layer Fluorescent ink 100 parts Resin binder 30 parts Solvent (ethyl acetate) 30 parts Isocyanate curing agent 5 parts Formula of fluorescent ink Fluorescent pigment 15 parts Solvent (ethyl acetate) 85 parts Formula of resin binder Synthetic resin 20 parts Solvent (ethyl acetate) 80 parts Formulation of isocyanate curing agent ink Resin 74 parts Isocyanate 0.3 parts Solvent (ethyl acetate) 25 .7 copies

(iii) Application of Adhesive to Roll Film and Slitting to Thread-Like Printed Matter On the roll film in wound form on which the above pattern formation and fluorescent print layer formation have been completed, an ethylene-vinyl acetate-based heat-seal adhesive was applied to the opposite side of the pattern-formed side by a gravure printing machine. The film thickness of the heat seal adhesive was about 1 μm. Thereafter, the roll film was split into pieces having a width of about 150 mm by a slitter, and threads having a width of about 2 mm were produced by a micro-slitter and wound on reels.

(b) Comparative Examples 1-5
Comparative Example 1, which differs from Example 1 only in that the isocyanate-based curing agent used in the fluorescent printing layer was not added, Comparative Example 2, which differs from Example 1 only in that the solvent used in the fluorescent printing layer is toluene, Comparative Example 3, which differs from Example 1 only in that an isocyanate-based curing agent is not added to the colored ink for pattern formation, and isocyanate, which does not add an isocyanate-based curing agent to the colored ink for pattern formation and is used in the fluorescent printing layer, compared to Example 1. Samples of Comparative Example 4, which differed from Example 1 in that no curing agent was added, and Comparative Example 5, which differed from Example 1 only in that corona treatment was not performed, were also prepared, and roll film production and slitting were performed as described above.

(c) Test Results Regarding the test sample of the thread-like printed material, the appearance of the pattern, the adhesive strength of the fluorescent printed layer, and the printed appearance of the fluorescent printed layer after wiping off the solvent were confirmed.
[Pattern Appearance]
- Good: There was no bleeding of the characters or dissolution of the ink, and the characters were well visible.
Somewhat poor: There is no problem in reading characters, but bleeding is partially observed.
• Poor: Bleeding and ink dissolution were conspicuous to the extent that they could be problematic in terms of appearance.
[Adhesion of fluorescent printing layer]
・Judged by classifications 0 to 5 of the cross-cut test (JIS K5600-5-6). However, the sample for test was performed with the size according to the standard.
[Print appearance of fluorescent print layer after wiping off solvent]
・To check the printed appearance of the fluorescent print layer, a cloth was soaked in toluene, and the fluorescent print layer was repeatedly wiped (rubbed).
Good: No ink was removed by wiping up to 5 times.
- Poor: The ink was easily removed by wiping up to 5 times.

Table 1 shows the test results. In Example 1 according to the first embodiment of the present disclosure, the appearance of the pattern was "good", and the adhesion of the fluorescent print layer was also "class 0" and good. Furthermore, the printed appearance of the fluorescent printed layer was also "good". On the other hand, in Comparative Examples 1 and 5, the adhesive strength of the fluorescent printed layer was "Class 3", which is insufficient, and in Comparative Example 1, the printed appearance of the fluorescent printed layer was "poor". In Comparative Examples 2 and 3, the appearance of the pattern was "slightly poor", and in Comparative Example 4, the appearance of the pattern was "poor". From this, it became clear that an isocyanate-based curing agent should be added to the colored ink for pattern formation, that the solvent used in the fluorescent printing layer should have a boiling point lower than that of the solvent used in the colored ink for pattern formation, that the isocyanate-based curing agent should be added to the fluorescent printing layer, and that corona treatment or the like is effective before printing.

1, 1A Thread-like printed matter 2 Roll film 3 Rolled film printed matter 4 Winding 5, 5A Anti-counterfeiting paper 6 Paper materials 10, 11 Base materials 20, 21, 22 Surface treatment units 30, 30A, 30B Fluorescent printed layers 31, 34, 36, 71 First fluorescent printed layers 32, 35, 37, 72 Second fluorescent printed layers 33, 73 Third fluorescent printed layers 40, 41, 41A, 41B, 42, 42A, 42B Patterns 61, 63 Upper paper portions 62, 64 Lower paper portions 65, 65A, 65B, 65C Window portion 66 Heat seal layer

Claims (5)

A thread-like printed material for embedding in anti-counterfeit paper,
a substrate;
a partial pattern formed on one side of the substrate containing colored ink;
A fluorescent printing layer provided to cover the pattern,
The colored ink forming the pattern contains a first solvent and an isocyanate-based curing agent,
The fluorescent ink forming the fluorescent printing layer contains a second solvent different from the first solvent, a fluorescent pigment, a resin binder, and a curing agent,
The boiling point of the second solvent is lower than the boiling point of the first solvent,
A thread-like printed matter in which the pattern is visible from both the one surface and the opposite surface of the substrate. Anti-counterfeiting paper prepared by incorporating the threaded printed matter according to claim 1 into paper. The anti-counterfeiting paper according to claim 2, wherein the entire printed thread is embedded in the paper, or a portion of the printed thread is embedded in the paper and another portion of the printed thread is exposed from the paper. a film-like substrate having transparency;
a colored ink containing an isocyanate curing agent;
providing a fluorescent ink containing a fluorescent pigment, a resin-based binder and a curing agent;
a step of printing the colored ink on one surface of the film-like substrate to partially form a pattern, and then drying it;
A step of printing the fluorescent ink to cover the pattern to form a fluorescent printed layer, and then drying it ,
The colored ink is printed in a state containing a first solvent,
The fluorescent ink is printed in a state containing a second solvent different from the first solvent,
A method of producing a roll film print for producing a threaded print , wherein the boiling point of the second solvent is lower than the boiling point of the first solvent . a step of slitting the roll film print manufactured by the method for manufacturing the roll film print according to claim 4 to create a thread-like print;
A method for producing anti-counterfeiting paper, comprising a step of forming the thread-like printed material into paper to prepare anti-counterfeiting paper.