JPH06155975A - Paper whose content can not be copied - Google Patents

Abstract

PURPOSE:To obtain respectively clear discrimination of a character or the like and a preventive effect against copying by a method wherein a mirror face reflective area by a smooth surface of a metal thin layer is formed in an existing area of a resin layer in a base material, and a diffused reflection area by a mat-shaped surface of the metal thin layer is respectively formed in a non-existing area of the resin layer. CONSTITUTION:In a base material 1 of which at least one surface is formed in a mat state, a resin layer 2 of which upper face is smooth is arranged on one part of the mat-shaped surface. Further, a metal thin layer 3 is arranged so as to cover respective surfaces of the base material 1 and the resin layer 2. Furthermore, a printing acceptive layer 4 is arranged on the upper surface of the metal thin layer 3. Then, a mirror face reflective area A is formed by a smooth surface of the metal thin layer 3 in an area where the resin layer 2 exists. Besides, a diffused reflection area B is formed by a mat-shaped surface of the metal thin layer 3 corresponding to the mat- shaped surface of the base material 1 in an area where the resin layer 2 does not exist. Thereby, a character or the like formed on the printing acceptive layer 4 in the diffused reflective area B is clearly discriminated, and besides a copying preventive effect is obtained by the mirror face reflective area A.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet having a protection function against illegal copying or forgery using a copying machine, and more particularly to a non-copyable sheet suitable as a sheet of securities, lottery tickets, gift certificates, commuter passes and the like. .

[0002]

2. Description of the Related Art Paper having a metallic luster on its surface is known as a paper having a protection function against illegal copying or forgery using a copying machine. When such a sheet is copied by an ordinary copying machine, the light from the light source of the copying machine is not correctly reflected on the photoconductor, so that only a black copy can be obtained, so that illegal copying or forgery cannot be performed. However, since the entire surface of this paper has a metallic luster close to that of a mirror surface, letters, numbers, symbols, figures and images (hereinafter referred to as "characters") printed on this surface are visually recognizable. It has the drawback of being difficult to do.

In order to solve this drawback, a metallic glossy surface is formed only on a part of the surface of the paper and a printing paper surface is formed on the other part (Japanese Utility Model Publication No. 57-42699),
There has been proposed a paper having at least a part of the paper surface provided with a metallic luster portion in the form of dots or lines (Japanese Utility Model Publication No. 63-47492, Japanese Patent Laid-Open Publication No. 60-262690).

[0004]

However, even if the metallic glossy surface is formed only on a part of the surface of the paper, if the other part is formed by printing characters on the ordinary paper, Since the light reflectances of these two portions are extremely different, the distinctiveness of characters and the like with the naked eye is actually extremely low. Further, with respect to the surfaces other than the metallic glossy surface, it is not possible to completely avoid the risk that the characters and the like formed here will be tampered with by forgery means other than copying, such as scraping.

[0005]

According to the present invention, a base material having a mat-like surface on at least one side, and a resin layer having a smooth upper surface provided on a part of the mat-like surface of the base material are provided. ,
A metal thin layer provided so as to cover the surfaces of the base material and the resin layer, and a print receiving layer provided on the metal thin layer, and the region where the resin layer is present is the metal thin layer. And a region where the resin layer does not exist forms an irregular reflection region due to a mat-shaped metal thin layer surface corresponding to the mat-shaped surface of the base material. Non-copyable paper is provided.

That is, the non-copyable paper of the present invention is capable of forming characters and the like on the entire surface thereof by at least one of arbitrary printing means including printing, thermal transfer, writing, and imprinting, and at the same time, in the specular reflection area. On the other hand, the characters and the like formed in the diffused reflection area having a small difference in covering glossiness can be clearly recognized by visual observation.

In another aspect of the present invention, a resin layer having a matte upper surface is provided on a part of a base material having a smooth surface, and a metal thin layer and a print receiving layer are provided thereon. In this case, the region where the resin layer is present is the irregular reflection region, and the region where the resin layer is not present is the specular reflection region.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, the base material indicated by reference numeral 1 has a mat-like shape with one surface having fine irregularities over its entire surface. A resin layer 2 having a smooth surface is provided on a part of the mat-like surface. ing. That is, the surface of the base material 1 is divided into a mat-shaped area and a smooth area covered with the resin layer 2. Then, a metal thin layer 3 is provided over the entire surface, and a print receiving layer 4 is provided thereon. On the upper surface of the thin metal layer 3, there are two areas: a specular reflection area A that is smooth and forms a mirror surface, and a diffuse reflection area B that has a similar matte shape because the lower surface is in contact with the matte surface of the substrate. Exists.

The "matte" and "smooth" in the present invention mean a digital gloss meter (JIS Z8741;
It can be represented by the specular glossiness of the surface measured by the 60-degree specular gloss method, and "matte" is 40 or less, preferably 30 or less, and "smooth" is 70 or more, preferably 80 or more. Refers to a value.

The substrate 1 can be composed of a film or sheet of plastic such as natural or synthetic paper, polyester, polypropylene, polycarbonate, polyethylene, polyvinyl chloride, polyimide, polyvinylidene chloride. In the embodiment of FIG. 1, at least one surface of the base material 1 has a mat shape over the entire surface.

The substrate 1 can be used by appropriately selecting one having a surface specular gloss of 40 or less, preferably 30 or less from the following materials, and having a surface specular gloss of 40 or less.
Materials exceeding 5 can be used by performing suitable mat processing such as sand mat processing and coating mat processing in advance.

Alternatively, vinyl chloride type, cellulose type,
It is also possible to add about 10% of a matting agent (matting additive) to a polyester-based or acrylic-based resin and apply the matting agent on the entire surface of the base material 1 by a usual printing method or coating method. A matt surface can be formed on the surface.

Further, by using this method, a material having poor adhesion to a thin metal layer and heat resistance, such as general paper, can be used as a substrate.

The resin layer 2 is provided in a predetermined region of the base material 1 so as to form a smooth surface which is not affected by the unevenness of the surface of the base material 1, and its material and forming method are not particularly limited. Generally, the resin layer 2 having a specular gloss of 70 or more can be formed by printing with a normal ink or coating with a paint. The material of the resin layer 2 includes vinyl chloride type, cellulose type,
A resin-based coating such as polyester-based, acrylic-based or urethane-based is used, and 1 to 3 is partially applied to the base material by a usual printing means such as a gravure method, an offset lithographic method and a silk screen method.
It is formed with a thickness of μm. Since another layer of resin is applied as the print-receiving layer on the upper layer, it is desirable to use a curable coating composition such as a two-component curing system, an external beam curing system, or an electron beam curing system.

As a pattern to be printed, a simple pattern such as a line is sufficient, but if a pattern or the like is designed, only this portion is finished into a glossy shape and has a design effect.

The thin metal layer 3 is made of Al, Cu, Ag, Zn,
It is made of a metal such as Ni, Sn, Pb, Bl, or Au, or an alloy of these metals, and is formed by an appropriate thin film forming means such as a vacuum vapor deposition method, a sputtering method, an ion plating method. Alternatively,
It can also be provided by printing using an ink containing metal powder. Whatever method is used, it is desired that the thickness of the metal thin layer 3 be as thin as possible in order to reflect the mat-like surface of the base material 1 thereunder on the upper surface. Whether the vacuum deposition method or the printing method is applied, the thickness of the metal thin layer 3 is 0.03 to 2.0 μm.
m is suitable. Therefore, the type of metal used and the method for forming a thin film are not particularly limited, but the vacuum deposition method of Al is most practical because it is inexpensive and it is easy to obtain a thin metallic glossy surface.

The uppermost print receiving layer 4 is a layer on which characters and the like can be formed by means such as printing or thermal transfer. This is a transparent or semitransparent resin, and a thin metal layer formed by a usual means such as a coating method. 3 can be formed by coating the entire surface thereof. Suitable resins are polyester, polyamide, polyvinyl alcohol, polyvinylcarbazole, vinyl chloride, acrylic, polyurethane, fluororesins and the like. The print receiving layer 4 is appropriately selected from these resins in consideration of surface protection, print receiving property, heat resistance, transparency and the like. As the forming means, various coating methods or ordinary printing methods such as a gravure method, a silk screen method and an offset lithographic method can be applied, but the gravure coating method is preferable in practice. The thickness is 1 to 20 μm, preferably 2 to 3
μm. Further, when the paper is used as paper for securities, lottery tickets, gift certificates, commuter tickets, etc., a tint block layer can be provided on the print receiving layer 4.

As the resin constituting the tint block layer, it is necessary to use a resin which is easily dissolved in an organic solvent which hardly dissolves the base material of the recording medium and the print receiving layer. That is, it is useful to prevent these fraudulent acts by having the property of being extremely sensitive to erasure by alcohols, aromatic solvents or plastic erasers that are easily used for forgery, alteration or modification. .

Resins usually used as a material for the tint block layer are, for example, synthetic resinous substances such as polyvinyl formal, polyvinyl acetal, polyvinyl butyral, pine resin, shellac and other natural resins.

When the copy-forgery-inhibited pattern layer is formed of a composition mainly composed of a hydrocarbon resin, the paper of the present invention can prevent fraud even if an aromatic solvent such as benzene, toluene or xylene is used.

The paper thus constructed has a specular reflection area A covered with the resin layer 2 and a matte irregular reflection area B having a reflectance somewhat smaller than the specular reflection area A.
Therefore, the characters and the like formed on the print receiving layer 4 in the irregular reflection area B can be clearly identified, and
A copy protection effect due to the specular reflection area A can be obtained.

FIG. 2 shows a non-copyable sheet according to another embodiment of the present invention. In this example, a resin layer 2'having a matte upper surface is formed on a part of a base material 1'having a smooth surface.
Is provided, and the metal thin layer 3 and the print receiving layer 4 are provided thereon by the same means as described above. Therefore, FIG.
Contrary to the example described above, the portion where the resin layer 2 ′ is present forms the irregular reflection area B, and the portion where it is not present forms the specular reflection area A. As the substrate 1 ', a material having a surface specular gloss of 70 or more, preferably 80 or more can be appropriately selected and used from the same materials as the substrate 1, but the surface specular gloss is less than 70. Even the above materials can be used by performing appropriate smoothing processing such as calendar processing in advance.

Further, a vinyl chloride-based, cellulose-based, polyester-based, acrylic-based resin or the like may be applied to the entire surface of the base material 1'by a usual printing method or coating method to form a smooth surface on the base material 1 '. Can be formed.

The resin layer 2'can be formed by the same constitution means as the resin layer 2 using a paint similar to the resin layer 2 mixed with about 10% of a matting agent (matting additive).

An embodiment in which a passenger commuter pass and copy paper are prepared according to the present invention will be described below.

Example 1 (passenger ticket for boarding) Width 410 mm, thickness 188 μm, surface specular gloss 32
The white PET film (Toray E-24) was prepared and the magnetic recording layer was coated. The magnetic recording layer uses barium ferrite as magnetic powder and has a thickness of about 11 μm and a coercive force of 275.
0 Oersted, squareness ratio 0.8 or more, residual magnetic flux 1.4
It was Maxwell / cm. Further, a protective layer was overcoated on the magnetic recording layer. As a paint for the protective layer, a polyester-based paint was used in combination with an isocyanate-based curing agent, and the coating was applied by a gravure method to a dry film thickness of 1 μm. Next, the following paint was gravure-coated on the opposite surface of the substrate to form a resin layer having a smooth surface and a thickness of 1 μm, which was composed of a plurality of continuous strip-shaped solid patterns having a width of 5 mm and a distance of 30 mm. (Mirror surface glossiness of resin layer: 78) Polyurethane resin paint "N-2301" (Nippon Polyurethane Industry) 30 parts by weight Isocyanate curing agent "Coronate L" (Nippon Polyurethane Industry) 2 parts by weight MEK 40 parts by weight Toluene 40 parts by weight Then, aluminum was vapor-deposited by a vacuum vapor deposition method so as to cover the surfaces of the base material and the resin layer to form a thin metal layer having a thickness of 0.08 μm.

At this stage, the portion directly vapor-deposited on the white PET film has already formed a diffuse reflection area in which a metallic luster is not generated and glare is suppressed, while vacuum vapor deposition is performed on a resin layer having a smooth surface. A specular reflection area having a metallic luster is formed in the formed portion. After that, the following coating material was applied on the entire surface of the thin metal layer by reverse roll coating and dried at 120 ° C. for 1 minute to form a print receiving layer of about 2 μm. Polyester resin paint "Vylon 20SS" (Toyobo) 50 parts by weight Microcrystalline wax (Nippon Seiro) 1 part by weight MEK 25 parts by weight Toluene 25 parts by weight Further, a tint block made of vinyl chloride resin is formed on the print receiving layer by the gravure printing method. did.

The above product was punched into a commuter pass size, and thermal transfer printing was performed with a thermal printer using a resin ribbon (Sony Chemical TR4070).

As a result, a clear printed image was obtained in which the printed contents could be sufficiently identified even with the naked eye. When the commuter pass thus obtained was copied with a color copying machine, the printing section and the tint block printing section were faithfully reproduced, but a black copy was obtained in which the region where the resin layer was present was continuous strip-shaped. .

Example 2 (copy paper) width 410 mm, thickness 100 μm, surface specular gloss 98
Was prepared, and the following paint was gravure coated to form a resin layer having a matte surface with a thickness of 1 μm, which is composed of a plurality of continuous strip-shaped solid patterns having a width of 50 mm and an interval of 5 mm. (Mirror surface glossiness of the resin layer: 25) Polyurethane resin paint "N-2301" (Nippon Polyurethane Industry) 30 parts by weight Isocyanate curing agent "Coronate L" (Nippon Polyurethane Industry) 2 parts by weight Matting agent "Neoflat Base"# 2 "(Isam paint) 8 parts by weight MEK 40 parts by weight Toluene 40 parts by weight Subsequently, aluminum was vacuum-deposited so as to cover the surfaces of the base material and the resin layer to form a thin metal layer having a thickness of 0.08 μm. . After that, the following paint was applied to the entire surface by gravure coating and dried at 120 ° C. for 1 minute to form a print receiving layer of about 2 μm.

Polyester resin paint “Vylon 29SS” (Toyobo) 30 parts by weight MEK 35 parts by weight Toluene 35 parts by weight The obtained sheet was cut into A4 size sheets and set in a copying machine as copy paper to copy the document. As a result, a clear copy image was obtained in which the contents of the document could be sufficiently read with the naked eye. Subsequently, when the sheet was further copied, a black copy was obtained in which the region where the resin layer did not exist was formed into a continuous strip.

[0032]

As described above, in the non-copyable paper of the present invention, the specular reflection area covered with the resin layer and the matte irregular reflection area having a reflectance slightly smaller than that are formed. As a result, the characters and the like formed on the print receiving layer thereabove can be clearly identified, and the effect of copy protection due to the specular reflection area can be obtained.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a non-copyable sheet according to an embodiment of the present invention.

FIG. 2 is a vertical sectional view of a non-copyable sheet according to another embodiment of the present invention.

[Explanation of symbols]

 1,1 'Base material 2,2' Resin layer 3 Metal thin layer 4 Print receiving layer

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI Technical display location D21H 27/00 G03G 7/00 101 Z 21/00

Claims (2)

[Claims] 1. A base material having at least one surface of a mat shape, a resin layer having a smooth upper surface provided on a part of the mat-like surface of the base material, and the surfaces of the base material and the resin layer. A metal thin layer provided so as to cover the metal thin layer, and a print receiving layer provided on the metal thin layer, the region where the resin layer is present is a specular reflection region due to the smooth surface of the metal thin layer. A non-copyable sheet, wherein the region where the resin layer does not exist forms an irregular reflection region due to a mat-shaped metal thin layer surface corresponding to the mat-shaped surface of the substrate. 2. A base material having at least one smooth surface, a resin layer having a mat-shaped upper surface provided on a part of the smooth surface of the base material, and the surfaces of the base material and the resin layer. A metal thin layer provided so as to cover the metal thin layer and a print receiving layer provided on the metal thin layer, and the region where the resin layer does not exist is the metal thin layer corresponding to the smooth surface of the base material. A specular reflection area is formed by the smooth surface of the layer, and the area where the resin layer is present forms an irregular reflection area by the mat-shaped metal thin layer surface corresponding to the mat-shaped surface of the resin layer. Characteristically non-copyable paper.