JP2002258726A - Method of manufacturing hologram sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of manufacturing a sheet which is simple in constitution, is inexpensive, has high luminance and a strong iris over the entire part of a segment coated with ink and is highly effective in preventing forgery. SOLUTION: The prescribed portion of a base material surface is coated with the ink containing many hologram micropieces and the hologram film micropieces are so oriented as to be made nearly flat to the base material surface. The hologram film micropieces are so oriented as to be nearly paralleled to the base material surface in coating the base material surface with the ink containing the many hologram micropieces or after the coating.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a sheet having excellent design properties and, in particular, a high anti-counterfeiting property for forms such as receipts and securities, IC cards, magnetic cards and rewritable cards. is there.

[0002]

2. Description of the Related Art Hitherto, a hologram label or a brilliant label has been pasted on a substrate surface of a foam or a card for the purpose of making it difficult to forge, and a high brightness pigment such as a titanium coating mica has been used. Ink (pearl ink, etc.) is printed on a specific portion of the substrate surface.

[0003] These are excellent in that they are not easily forged and do not require a special authentication device, but on the other hand, hologram labels are complicated and expensive to manufacture, and bright labels are also expensive. There was a problem that manufacturing cost increased. An ink using a high-brightness pigment-containing ink gives a pearl-like luster, but has the drawback that the luminance is low and the iris (color change when viewed at different angles) is weak.

On the other hand, there is a method of printing a mark or the like with a special fluorescent ink. According to this method, the mark is concealed in a normal state without increasing the manufacturing cost and complicating the manufacturing process. This kind of special fluorescent ink is lighter in color,
In some cases, it is difficult to make a determination, and in addition, a black light irradiation device is required for authenticity determination.

[0005] These authenticity determination techniques have a problem in that when they have been technically established, the date has passed, and when they are generally recognized and become publicized, the possibility of being easily forged is increased. is there.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to solve the conventional drawbacks and problems, and to provide a sheet having a strong luminance and a strong iris. An object of the present invention is to provide a novel sheet manufacturing method which can be suitably applied to forms such as inexpensive receipts and securities, IC cards, magnetic cards, rewritable cards, etc., without requiring a proper authentication device.

[0007]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to solve the above-mentioned problems, and as a result, have used a hologram film and prepared a surface of a substrate using an ink containing many fine pieces of the hologram film. The present inventors have found that this problem can be solved by applying the fine particles so as to be substantially parallel to the substrate surface, and have completed the present invention.

That is, in the method for producing a hologram sheet according to the first aspect of the present invention, when or after applying an ink containing a large number of hologram fine pieces, the hologram film fine pieces are applied to the substrate surface. Are oriented so as to be substantially parallel to each other. Further, the method for producing a hologram sheet according to claim 2 of the present invention is characterized in that, in the method for producing a hologram sheet according to claim 1, the ink containing a large number of hologram fine pieces is an ultraviolet curable ink.

In the present invention, a hologram film is used, and the hologram film is coated on a base material using an ink containing fine flakes. A number of fixed hologram film micro-pieces have strong brightness and strong iris, and are excellent in design, and especially easy to manufacture novel sheets with high anti-counterfeiting properties it can.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1A is a schematic cross-sectional explanatory view of an embodiment of a hologram sheet manufactured by the method of the present invention, and FIG. 1B is a cross-sectional view of the hologram sheet shown in FIG. It is a plane explanatory view.

As shown in FIGS. 1 (a) and 1 (b), the hologram sheet 1 manufactured by the method of the present invention is exposed to visible light containing a hologram film fine piece 3 at a predetermined portion of the surface of a substrate 2. The hologram film 3 is formed by applying a transparent ink 4 and orienting the hologram film fine pieces 3 so as to be substantially flat with respect to the surface of the substrate 2.

The hologram film used in the present invention is not particularly limited as long as interference fringes corresponding to the wavefront of light from an object are formed as a hologram image. For example, the thickness is about 10 to 20 μm. Form the same groove as the visible light spectrum with a laser beam etc. in a polyethylene terephthalate film transparent to visible light,
In order to further increase the reflectance, the surface is subjected to aluminum evaporation. In the present invention, a commercially available hologram foil or hologram film can be used. For example, a thermoplastic resin layer such as an acrylic lacquer is formed on the surface of a support film such as a polyester film, a hologram surface having irregularities of about 2500 ° is formed on the surface, and various metals are further vapor-deposited. is there. In addition, an ultraviolet (or electron beam) curable resin solution is applied to a part or the entire surface of the support film, a commercially available hologram film is pressed, irradiated with ultraviolet (or electron beam) and cured, and the commercially available hologram film is peeled off. A method of forming a hologram unevenness on the surface of an ultraviolet (or electron beam) curable resin layer (JP-A-5-232853), or a method in which a metal deposition layer is formed thereon Is also good. Further, those obtained by laminating a protective film on the surface of the various hologram films described above may be used.

In the present invention, the hologram film is used as fine pieces. Such fine pieces are also commercially available [eg, Geometric Pigment, Silver 256 (100 μm × 100 μm) manufactured by Tomoe Kogyo KK)
mx thickness 12μm), Geometric Pigment, Silver 500 (length 50μm x width 50μm x thickness 12μ)
m)].

For example, a known ultraviolet curable ink containing an appropriate amount of these fine pieces is applied to a base material, and the fine pieces 3 are made substantially flat with respect to the surface of the base material 2 as shown in FIG. Hologram sheet 1
Is a novel sheet having strong brightness and strong iris and excellent in anti-counterfeiting properties. In the present invention, the fine piece 3 may be directed to the surface of the hologram sheet 1, to the side opposite to the surface of the hologram sheet 1, or to be mixed at an arbitrary ratio. But you can.

The method for orienting the fine pieces 3 so as to be substantially flat with respect to the surface of the substrate 2 is not particularly limited.

The method for producing a hologram sheet according to the present invention can be carried out by letterpress printing, intaglio printing such as gravure printing, flat printing such as offset printing, screen printing, ink jet printing and other commonly used printing methods. Even if the ink to be used is applied to the base material, the fine pieces 3 may be slightly oriented to be substantially flat with respect to the surface of the base material 2, but most of the fine pieces 3 It is not oriented so as to be almost flat with respect to the plane.

Therefore, as one method, for example, when the ink used in the present invention is applied to a substrate using a roll, a stick (about 10 mm in diameter), a spatula, a cloth pad (about 100 mm in diameter), or the like. If the shearing force is applied to the fine pieces 3 by stretching or rubbing with a roll, a stick, a spatula, a cloth pad, etc., most of the fine pieces 3 It is oriented so as to be almost flat with respect to the surface of the substrate 2. Thereafter, if necessary, the film is dried or irradiated with ultraviolet rays to be cured.

In the present invention, most of the fine pieces 3
Means that about 50% or more, preferably about 60% or more, and particularly preferably 70% or more of the total fine pieces 3 contained in the Means almost flat.

As another method, after the ink used in the present invention is applied to a substrate and before the ink is cured, for example, the coated surface is extended or stretched using a roll, a spatula, a bar, a cloth pad, or the like. If a shear force is applied to the fine pieces 3 by rubbing or rubbing the coating film, most of the fine pieces 3 are oriented so as to be almost flat with respect to the surface of the substrate 2. Thereafter, if necessary, the film is dried or irradiated with ultraviolet rays to be cured.

Another method is a method in which the fine pieces 3 are oriented so as to be substantially flat with respect to the surface of the substrate 2 by a method combining the above two methods.

In the present invention, any of the above methods can be used. Above all, if the shear force is applied to the fine pieces 3 when applying the ink used in the present invention to the base material, most of the fine pieces 3 become almost flat with respect to the surface of the base material 2 in a small number of steps. This method can be preferably used because the orientation can be adjusted as follows.

In the present invention, an ink containing a large number of hologram film fine pieces is used. The vehicle is not particularly limited, and a known ink vehicle can be used. Most preferred. Such an ultraviolet-curable vehicle can be arbitrarily selected from known acrylic photopolymerizable monomers and / or acrylic photopolymerizable oligomers.

Examples of such photopolymerizable monomers include unsaturated carboxylic acids such as acrylic acid and methacrylic acid and esters thereof, such as alkyl-, cycloalkyl-, halogenated alkyl-, alkoxyalkyl-, hydroxyalkyl-, and the like. Aminoalkyl-, tetrahydrofurfuryl-, allyl-, glycidyl-, benzyl-,
Phenoxy-acrylates and methacrylates, alkylene glycols, mono- or diacrylates and methacrylates of polyoxyalkylene glycols, trimethylolpropane triacrylate and methacrylate, pentaerythritol tetraacrylate and methacrylate, acrylamide, methacrylamide or derivatives thereof, such as alkyl groups and Allyl compounds such as acrylamide and methacrylamide, diacetone acrylamide and methacrylamide, N, N'-alkylenebisacrylamide and methacrylamide mono- or di-substituted with a hydroxyalkyl group, for example, allyl alcohol, allyl isocyanate, diallyl phthalate, triaryl Allyl isocyanurate and the like can be mentioned.

In the case of an application in which the curing shrinkage is hindered, for example, isobornyl acrylate or methacrylate, norbornyl acrylate or methacrylate, dicyclopentenoxyethyl acrylate or methacrylate, dicyclopentenoxypropyl acrylate or Such as methacrylate, acrylate or methacrylate of diethylene glycol dicyclopentenyl monoether, acrylate or methacrylate of polyoxyethylene or polypropylene glycol dicyclopentenyl monoether, such as dicyclopentenyl cinnamate, dicyclopentenoxy Ethyl cinnamate, dicyclopentenoxyethyl monofumarate or difumarate, such as 3,9-bis (1,1
-Bismethyl-2-oxyethyl) -spiro [5,5]
Undecane, 3,9-bis (1,1-bismethyl-2-
(Oxyethyl) -2,4,8,10-tetraoxaspiro [5,5] undecane, 3,9-bis (2-oxyethyl) -spiro [5,5] undecane, 3,9-bis (2-oxyethyl) Mono-, diacrylate or mono-, such as -2,4,8,10-tetraoxaspiro [5,5] undecane, dimethacrylate, or mono-, ethylene- or propylene oxide addition polymers of these spiroglycols; Diacrylate, or mono-, dimethacrylate, or methyl ether of the above-mentioned monoacrylate or methacrylate, 1-azabicyclo [2,2,2] -3-octenyl acrylate or methacrylate, bicyclo [2,2,1] -5 Dicyclopentane such as heptene-2,3-dicarboxyl monoallyl ester Enyl acrylate or methacrylate, it can be used a photopolymerizable monomer, such as dicyclopentadienyl oxyethyl acrylate or methacrylate, dihydrodicyclopentadienyl acrylate or methacrylate. These photopolymerizable monomers may be used alone or in combination of two or more.

Examples of the acrylic photopolymerizable oligomer include:
Acrylic ester of epoxy resin such as diglycidyl ether diacrylate of bisphenol A, reaction product of epoxy resin with acrylic acid and methyltetrahydrophthalic anhydride, reaction product of epoxy resin with 2-hydroxyethyl acrylate, glycidyl diacrylate Ring opening copolymerization ester of acrylate and phthalic anhydride, ester of methacrylic acid dimer and polyol, polyester obtained from acrylic acid, phthalic anhydride and propylene oxide, reaction product of polyvinyl alcohol and N-methylolacrylamide After esterification of an unsaturated polyester-based prepolymer such as a reaction product of polyethylene glycol, maleic anhydride and glycidyl methacrylate, and polyvinyl alcohol with succinic anhydride,
Polyvinyl alcohol-based prepolymers such as those to which glycidyl methacrylate is added, such as a reaction product of methyl vinyl ether-maleic anhydride copolymer and 2-hydroxyethyl acrylate or a product obtained by further reacting glycidyl methacrylate Polyacrylic acid or maleic acid copolymer-based prepolymers, and the like, as well as urethane prepolymers having a polyoxyalkylene segment and / or a saturated polyester segment linked via a urethane bond and having an acryloyl group or a methacryloyl group at both ends. Can be mentioned. These acrylic photopolymerizable oligomers,
Those having a weight average molecular weight of about 2,000 to 30,000 are suitable.

As the photopolymerization initiator, conventionally known photopolymerization initiators may be used. For example, 1-hydroxy-cyclohexyl-phenyl-ketone, 2-hydroxy-2-methyl-1
-Phenyl-propan-1-one, 1- [4- (2-hydroxyethoxy) -phenyl] -2-hydroxy-methyl-1-propan-1-one, 2-methyl-1- [4
-(Methylthio) phenyl] -2-morpholinopropan-1-one, 2-benzyl-2-dimethylamino-1
-(4-morpholinophenyl) -butanone-1-bis (2,6-dimethoxybenzoyl) -2,4,4-trimethyl-pentylphosphine oxide-bis (2
4,6-trimethylbenzoyl) -phenylphosphine oxide. These photopolymerization initiators may be used alone or in combination of two or more. Its content is usually 10
It is preferably selected in the range of 5 to 15 parts by mass per 0 parts by mass.

The ink used in the present invention may further contain, if desired, commonly used additives such as a reactive diluent, a tackifier, a viscosity modifier, an antioxidant, an ultraviolet absorber, and a pH regulator. , Defoamers, various stabilizers, coloring agents, lubricants,
A sensitizer and the like can be contained.

The ink used in the present invention can be obtained by simply printing using letterpress printing, intaglio printing such as gravure printing, flat printing such as offset printing, screen printing, ink jet printing and other commonly used printing methods. It is difficult to orient the hologram film fine piece 3 so as to be substantially flat with respect to the surface of the substrate 2 as described above, but the ink used in the present invention is applied to at least a predetermined portion of the upper surface of the substrate by these printing methods. At the time of coating or after coating, if the hologram film fine piece 3 is oriented so as to be substantially flat with respect to the surface of the base material 2 as described above, Can be oriented to be almost flat. Then, the sheet according to the present invention can be dried and cured by irradiating light such as ultraviolet rays as needed.

As the base material used in the present invention, fine paper, art paper, coated paper, mirror coated paper, condenser paper,
In addition to paraffin paper and other papers, paper, films and sheets with an overcoat layer (protective layer), as well as synthetic paper or the synthesis of polyethylene, transparent polyethylene terephthalate, polypropylene, vinyl chloride, etc. Films and sheets can also be used. When using such synthetic films or sheets, it is preferable to apply a surface treatment such as mat treatment or corona treatment to the surface of the substrate. The amount of coating on the substrate surface is not particularly limited, but is, for example, 1 to 30 g / m ² , preferably 3 g / m ² .
To 20 g / m ^2, further preferably 5 to 15 g / m ^2.

Since the present invention is not limited to the above embodiment, various modifications can be made without departing from the spirit of the appended claims.

[0031]

The present invention will be described in more detail with reference to the following Examples and Comparative Examples, but the present invention is not limited to these Examples. (Example 1) 100 parts by mass of a commercially available ultraviolet curable ink (silver varnish, T & K TOKA) was used to prepare a hologram film fine piece [Geometric Pigment manufactured by Tomoe Kogyo Co., Ltd.
Silver 256 (length 100 μm x width 100 μm x thickness 1
2 μm)], and mixed to prepare an ink used in the present invention. Using this ink, a substrate (plastic card) surface is coated with a pad (approximately 100 mm in diameter) by a pad (approximately 100 mm in diameter) to form a coating film, and a shearing force is applied to the fine pieces 3, as shown in FIG. As described above, most of the fine pieces 3 were oriented so as to be substantially flat with respect to the surface of the base material 2 and then cured by irradiating ultraviolet rays to produce a hologram sheet according to the present invention. This sheet was visually evaluated for luminance and iris (color change when viewed at different angles). As a result of evaluation based on the following evaluation criteria, the luminance was 5 and the iris was 5.

Luminance evaluation criterion: 5: The entire coated surface shines strongly. 4: The entire coated surface is shining temporarily. 3: Each hologram film fine piece shines, but the entire coated surface does not shine. 1: No shine.

Iris evaluation criteria; 5: Strong iris as a whole coated surface is observed. 4: An iris is temporarily observed as the whole coated surface. 1: Each hologram film fine piece has an iris, but does not have a strong iris as a whole coated surface.

Example 2 Hologram Film Fine Piece 8
An ink used in the present invention was prepared in the same manner as in Example 1 except that the amount was changed to 0 parts by mass, and a hologram sheet according to the present invention was prepared in the same manner as in Example 1, and the luminance and iris were visually evaluated. As a result, the luminance was 5 and the iris was 5.

Example 3 Hologram Film Fine Piece 1
An ink used in the present invention was prepared in the same manner as in Example 1 except that the amount was changed to 50 parts by mass, a hologram sheet according to the present invention was prepared in the same manner as in Example 1, and the luminance and iris were visually evaluated. As a result, the luminance was 5 and the iris was 5.

Example 4 A fine piece of a hologram film [Geometric Pigment, Silver 500 (50 μm × 50 μm × 12 μm), manufactured by Tomoe Kogyo Co., Ltd.]
The hologram sheet according to the present invention was prepared in the same manner as in Example 1 except that the ink was used in the same manner as in Example 1 except that the hologram sheet was contained in an amount of 80 parts by mass.
The luminance and the iris were visually evaluated.
Met.

Example 5 A fine piece of a hologram film [Geometric Pigment, Silver 500 (50 μm in length × 50 μm in width × 12 μm in thickness) manufactured by Tomoe Kogyo Co., Ltd.]
Was used to prepare the ink used in the present invention in the same manner as in Example 1, except that the hologram sheet was used, and a hologram sheet according to the present invention was prepared in the same manner as in Example 1, and the luminance and iris were visually observed. As a result of the evaluation, the luminance was 5 and the iris was 5.

Comparative Example 1 The hologram film was coated by screen printing using the ink used in Example 1 without performing the operation of orienting the fine pieces of the hologram film so as to be substantially flat with respect to the substrate surface. A sheet for comparison was prepared in the same manner as in Example 1 except that the coating thickness was 50 μm), and the luminance and iris were visually evaluated.

Comparative Example 2 The hologram film was coated by screen printing using the ink used in Example 2 without performing the operation of orienting the fine pieces of the hologram film so as to be substantially flat with respect to the substrate surface. A sheet for comparison was prepared in the same manner as in Example 2 except that the coating thickness was 100 μm), and the luminance and iris were visually evaluated.

Comparative Example 3 The hologram film was coated by screen printing using the ink used in Example 3 without the operation of orienting the fine pieces of the hologram film so as to be substantially flat with respect to the substrate surface. A sheet for comparison was prepared in the same manner as in Example 3 except that the coating thickness was 150 μm), and the luminance and iris were visually evaluated.

[0041]

According to the method for producing a hologram sheet of the present invention, an ink containing a large number of hologram fine pieces is applied to a predetermined portion of a base material surface, and the hologram film fine pieces are applied to the base material surface. Because it is oriented so that it is almost flat, many fixed hologram film fine pieces have strong brightness and strong iris, and are excellent in design,
In particular, there is a remarkable effect that a novel sheet having a high anti-counterfeit property, which has never existed before, can be easily manufactured. Further, by using an ultraviolet curable ink as the ink, a more remarkable effect that a stable ink layer can be easily formed is exhibited.

[Brief description of the drawings]

FIG. 1A is a schematic cross-sectional explanatory view of one embodiment of a hologram sheet manufactured by the method of the present invention;
(B) is an explanatory plan view of the hologram sheet shown in (A).

[Description of Signs] 1 hologram sheet 2 base material 3 hologram film fine piece 4 ink containing many hologram fine pieces

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2C005 HA02 HB10 JA18 2H113 AA04 BA01 BA03 BA05 BA09 BB02 BB08 BB22 BC02 CA37 CA39 DA53 DA54 DA57 FA04 FA09 FA10 2K008 AA13 DD03 DD12

Claims (2)

[Claims] 1. The method according to claim 1, wherein the hologram film fine particles are oriented so as to be substantially parallel to the base material surface when or after the application of the ink containing a large number of hologram fine particles. A method for manufacturing a hologram sheet. 2. The method for manufacturing a hologram sheet according to claim 1, wherein the ink containing a large number of hologram fine pieces is an ultraviolet curable ink.