JPH06313298A - Forgery-preventive paper and printed matter therefrom - Google Patents

Abstract

PURPOSE:To obtain a forgery-preventive paper and a printed matter therefrom which gives only copies of a quite different color tone from the original, even when it is copied by a copying machine. CONSTITUTION:The base paper is coated with a partial coating layer mainly comprising pearl pigments and an adhesive. As a pearl pigment, a pigment emitting rainbow colors is preferably used. Further, the paper is subjected to printing to give a forgery-preventive printed matter. Since the rainbow colors of the pearl luster layer are not copied, the printed matter can readily be winnowed from the false.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to anti-counterfeit paper and anti-counterfeit printed matter. More specifically, the present invention relates to an anti-counterfeit paper and an anti-counterfeit printed material that can obtain only a copy having a color tone completely different from that of a document (genuine) even if copying is performed by a copying machine.

[0002]

2. Description of the Related Art Recently, the accuracy of copying machines has been remarkably improved, and in particular, the spread of electrophotographic color copying machines facilitates the forgery of various securities. Various anti-counterfeiting measures have been considered to prevent this, and one of them is one that has a glitter in a current copying machine, for example, one that utilizes the inability to reproduce a metallic color. .

For example, as proposed in Japanese Utility Model Laid-Open No. 58-168754, a copy is prepared by providing a bright plate such as aluminum foil having a remarkable metal color tone on the upper surface of a base paper and providing a letter pattern on the surface of the bright plate. There is a proposal for non-copyable paper by machine.
When this is copied, the character pattern applied to the paper surface becomes unreadable because the foil surface is blackened when the light is emitted from the copying machine. Although this paper has the advantage that copying itself is impossible (the copy cannot be read), it has the drawback that the metallic color is overemphasized because it occupies a large area on the bright printing paper, which makes it uncomfortable. Further, there is another problem that the manufacturing process of the paper becomes complicated and the cost is inevitably increased.

Another method as an anti-counterfeiting means in consideration of a color copying machine is to print using a special ink,
There is a printed matter that is copied in a color completely different from that of a manuscript, and is applied to banknotes and the like.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide an anti-counterfeit paper and anti-counterfeit printed matter which are completely different from those of the prior art. Specifically, it is an object to obtain an anti-counterfeit paper and an anti-counterfeit printed matter in which the hue of the partial coating layer formed on the base paper cannot be reproduced even if an attempt is made to copy using a color copier.

[0006]

The present invention is an anti-counterfeit paper which is characterized in that a partial coating layer composed mainly of a pearl pigment and an adhesive is formed on the surface of a base paper. Further, the present invention is
The anti-counterfeit printed material is characterized in that a partial coating layer mainly composed of a pearl pigment and an adhesive and a printing layer on which predetermined matters are printed are formed on the surface of the base paper.

As the pearl pigment used in the present invention, any of known pearl pigments such as natural pearl essence, mica powder, titanium oxide-coated mica powder, basic carbonate and fish scale foil can be used. These manufacturing methods and the like are described in JP-B-35-5367, JP-B-39-28885, JP-B-48-23179, JP-B-47-29569, and JP-B-53-47375.
JP-B-56-39669, JP-B-58-7674,
JP-B-1-22873, JP-B-4-48812, JP-A-58-174449 and JP-A-58-180561.
JP-A-58-219226 and JP-A-59-782.
No. 65, JP-A-60-92359, and JP-A-62-34.
962, JP-A-62-285956, JP-A-4-2.
Any of the techniques described in No. 27666, etc. can be used.

The adhesive used in the present invention is an aqueous starch solution,
Alkaline-cut casein aqueous solution, styrene-butadiene copolymer latex, methyl methacrylate-butadiene copolymer latex, polyvinyl acetate emulsion,
A water-based adhesive consisting of a single or mixture of polyacrylate emulsion, phenol resin, alkyd resin, petroleum resin, vinyl resin, polyamide resin,
Any of acrylic resin, nitrocellulose, cyclized rubber, chlorinated rubber and the like, or an adhesive obtained by dissolving a mixture thereof in an organic solvent can be used.

The usage ratio of the pearl pigment and the adhesive is usually 100: 50 to 500 in terms of dry weight. At this time, a water resistant agent, a curing agent, a colorant, within a range that does not impair the object of the present invention,
Auxiliary materials such as a viscosity adjusting agent, an antiblocking agent, an antiseptic agent and an antifungal agent may be appropriately used in combination.

The anti-counterfeit paper of the present invention is mainly prepared by mixing the pearl pigment and the adhesive as described above to prepare a paint or ink, which is coated or printed on a part of the base paper to partially cover it. It is manufactured by forming layers.

By printing a predetermined matter on the anti-counterfeit paper thus manufactured to form a printing layer, the anti-counterfeit printed matter of the present invention can be obtained. Alternatively, a partial coating layer may be formed on the base paper by a printing means with an ink mainly composed of a pearl pigment and an adhesive, and predetermined items may be printed later, or vice versa.

When the thus obtained printed matter is copied by a color copying machine, the color of the portion (covering layer) where the pearl pigment layer is formed is not reproduced in the copied matter. The reason for this is not clear, but it was presumed that the reason was as follows. The pearl pigment is composed of particles having a plate-like crystal structure, and the pearl luster is generated by multiple reflection of light incident from the surface. In the color copying machine, the irradiation light is incident on the original at around 45 degrees, and most of the methods expose the photosensitive drum with reflected light around 90 degrees. The reflected light loses its pearlescent appearance at an angle of around 90 degrees,
The color of the pearlescent pigment is not reproduced in the copy.

Some pearl pigments emit iris color,
The feature is that the hue changes depending on the viewing angle. As the pearl pigment used in the present invention, it is particularly preferable to use a pearl pigment that emits this iris color. When paints or inks are separately prepared with pearl pigments that emit different hues of iris, and the coating layers are formed separately on the base paper, different iris colors can be partially visually recognized by the human eye. Similarly, the hue is not reproduced in the color copying machine, and the effect of preventing forgery is further enhanced.

The shape of the coating layer composed mainly of pearl pigment and adhesive can be selected from various shapes such as circle, ellipse, square, rectangle, star, stripe, arbitrary characters and figures. The method of forming the coating layer is a method of gravure coating using a gravure roll carved into a specific shape, a method of forming a striped coating layer using a stripe coater, a coating layer of a specific shape using a printing machine. Any method such as a method of partially forming a can be adopted.

The base paper used in the present invention is a bleached softwood kraft pulp (NBKP) or a bleached hardwood kraft pulp (LBK).
P), softwood bleached sulfite pulp (NBSP), thermomechanical pulp (TMP), and other paper-making pulps as main components, and a dry paper strength enhancer, a wet paper strength enhancer, a sizing agent, a fixing agent, a yield improving agent, A freeness improver, an antifoaming agent, a dye, a coloring pigment, a fluorescent agent, etc. are appropriately used in combination, and usually a freeness of 550 to 250 ml C.I. S. F. The paper is made using a known paper machine such as a Fourdrinier paper machine or a cylinder paper machine. In the present invention, it is also possible to apply starch, polyvinyl alcohol, various surface sizes, and the like on the paper surface during the papermaking process with a size press device or the like. If necessary, machine calendering treatment or super calendering treatment may be performed to improve the surface smoothness.

The anti-counterfeit paper of the present invention can be used in combination with other anti-counterfeit means. For example, see-through, mixed paper with dyed fibers, thread-making, and the like. As a result, the forgery prevention effect can be further enhanced.

[0017]

Example 1 350 parts of 20 parts by weight of NBKP and 80 parts by weight of LBKP
C. S. F. Beaten to 10 parts by weight of clay, 0.3 parts by weight of paper strengthening agent (trade name "Polystron 191", manufactured by Arakawa Chemical Industry Co., Ltd.), sizing agent (trade name "Size Pine E", Arakawa 1.0 part by weight of Chemical Industry Co., Ltd. and an appropriate amount of a sulfuric acid band were added to prepare a paper stock, and a base paper having a basis weight of 100 g / m ^{2 was} produced by a conventional method using a Fourdrinier paper machine. Prepare a paint consisting of 100 dry parts by weight of pearl pigment (trade name "Merlin Magna Pearl 1000", manufactured by Marl Corporation) and 220 parts by weight of adhesive (acrylic ester emulsion), and use a stripe coater to make a width of 5 m.
m stripes are applied to the base paper at intervals of 10 cm, and the thickness is 1
A 0 μm-thick coating layer was formed in a stripe shape to obtain an anti-counterfeit paper.

Example 2 The anti-counterfeit paper of Example 1 was color-printed with predetermined items using an offset printing machine. Color printing was not performed on the striped coating layer. The obtained anti-counterfeit printed matter was copied with a toner type color copying machine (trade name "Pixel" manufactured by Canon Inc.), but the pearl luster and hue of the striped coating layer were not copied at all, and the original copy The difference between the products was clearly recognized.

Example 3 An ink containing a pearl pigment having the following formulation was prepared. Formulation 1 Iridescent pearl pigment (trade name "Merlin Raster Pigments, Highlight Super Red 94
30Z ", manufactured by Marl Corporation) 100 parts by weight, medium (trade name" MFG medium "manufactured by Toyo Ink Co., Ltd.) 300 parts by weight, and solvent 500 parts by weight were prepared as an ink for gravure. Prescription 2 Pearl pigment that emits a green iris color (Product name: Merlin Raster Pigments, Highlight Super Green 1
8430Z ", manufactured by Marl Corporation) 100
An ink for gravure was prepared comprising dry parts by weight, 300 parts by weight of medium (trade name "MFG medium", manufactured by Toyo Ink Co., Ltd.), and 500 parts by weight of solvent. The base paper of Example 1 was coated with 15 g / m ² of clay. Next, using the gravure ink of Formulation 1, printing was performed using a cylinder roll in which 50 rectangles each having a size of 3 mm × 5 mm were randomly etched in an area of 10 cm × 10 cm. Then, using the gravure ink of Formula 2, 3 mm ×
Printing was performed using a cylinder roll in which 60 squares of 3 mm shape were randomly engraved in an area of 10 cm × 10 cm. In the anti-counterfeit paper thus obtained, red and green iris colors were visible at a certain angle.

Example 4 The anti-counterfeit paper of Example 3 was printed with a predetermined color using an offset printing machine in a single color (black) with many white spots. The obtained anti-counterfeit printed matter was copied with a toner type color copying machine (trade name "Pixel" manufactured by Canon Inc.), but the pearlescent luster and iris color of the rectangular and square covering layers were not copied at all, and the original And the difference between the duplicates was clearly recognized.

[0021]

As described above, the anti-counterfeit paper and anti-counterfeit printed matter of the present invention are manufactured and have the following remarkable effects. 1) Even if an attempt is made to make a copy with a color copying machine, the gloss and hue of the pearl pigment layer provided on a part of the base paper cannot be reproduced, so that it is possible to immediately determine whether or not it is a forged one. 2) Since the pearl pigment has a gentle color, it does not feel uncomfortable compared to anti-counterfeit paper that uses metal vapor deposition. 3) Since printing paper can be used to manufacture paper, small lots can be handled. 4) Easy recovery of papermaking fibers from waste paper. 5) Taking advantage of such characteristics, the anti-counterfeit paper of the present invention is a check paper, stock paper, bond paper, banknote paper, gift certificate paper, passport paper, various ticket papers, ticket,
It can be suitably used for ballots and the like.

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Claims (4)

[Claims] 1. An anti-counterfeit paper, characterized in that a partial coating layer composed mainly of a pearl pigment and an adhesive is formed on the surface of the base paper. 2. The anti-counterfeit paper according to claim 1, wherein the pearl pigment is a pearl pigment which emits an iris color. 3. A forgery-preventing printed matter, comprising a partial coating layer mainly composed of a pearl pigment and an adhesive and a printing layer on which predetermined matters are printed, formed on the surface of the base paper. 4. The anti-counterfeit printed matter according to claim 3, wherein the pearl pigment is a pearl pigment which emits an iris color.