JPH10885A - Document required for genuineness - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively prevent a forgery or an alternation by laminating a sheet containing no conductive fiber or a plastic film on at least one surface of a sheet mixed with a conductive fiber. SOLUTION: A conductive fiber contained in a mixed sheet 3 includes, in addition to a metal processed in a fiber state, carbon kneaded with a resin and formed in a fiber state, or a polymer fiber coated with a metal by vapor depositing which has its volume specific resistance value of 10<4> Ωcm or less. The sheet 3 having a thickness of about 50μm is used. At the time of mixing, it is not completely dried, but held in a moisture containing state. A sheet 2 having a thickness of about 100μm containing no conductive film is held in a moisture containing state, these three sheets are lamination both the surfaces, which are heated, press-bonded and then dried. A print layer 1, a magnetic recording layer 4 and a protective concealing layer are applied to this document. Thus, a basis of the document for holding its security can be formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to securities, prepaid cards, winning horse voting tickets, toll road pass tickets, railway tickets, bills, passports, credit cards, entry / exit management cards, bonds, certificates, and various certificates. And other documents (substrates) requiring authenticity, such as letters and other substitutes for banknotes.

[0002]

2. Description of the Related Art Documents requiring authenticity must have a function of preventing forgery and falsification. As one of techniques for preventing such forgery / falsification, it has been proposed to hold a conductive fiber in a document (for example, see Japanese Patent Publication No. 63-501250).
According to this technique, conductive fibers (hereinafter referred to as conductive fibers) are randomly distributed and held on a non-conductive document, and the distribution state of the conductive fibers is magnetically recorded on the document. It is recorded on a part or an external recording device. When checking the authenticity of a document, the document is irradiated with electromagnetic waves such as microwaves,
By detecting the reflection or transmission with a detector,
Detect the distribution state of the conductive fiber, compare the detection result with the recorded contents of the reference distribution state, and if forgery or falsification is added to the document,
Since the distribution state of the conductive fibers of the document is different from the previously recorded content, it is determined that the document is not authentic.

[0003] It has been proposed to apply this technology to official documents such as banknotes, driver's licenses and identification cards.

[0004]

This system is, in principle, an extremely effective countermeasure against counterfeiting and alteration. However, it is not always easy to randomly distribute the cards, certificates, certificates, etc., which require authenticity used in the system without directly damaging the conductive fiber. Thus, documents (substrates) that are easy to manufacture or that can be easily applied to post-processing have been expected. The present invention is a document requiring authenticity in which paper or a plastic film containing no conductive fiber is laminated on at least one surface of paper mixed with conductive fiber.

[0005] The present invention also relates to a document requiring authenticity in which a plastic film containing no conductive fiber is attached to at least one surface of paper mixed with conductive fiber using an adhesive. Further, it is a document requiring authenticity in which a plastic film containing no conductive fiber is bonded to at least one surface of paper mixed with conductive fiber by heat fusion.
The present invention has been made in view of the above circumstances, and provides a document that is extremely effective in preventing forgery and alteration without damaging the conductive fiber and without impairing the appearance. It is.

[0006]

According to the present invention, as a paper having a thickness of 10 .mu.m to 300 .mu.m, conductive fibers are mixed so as to have a uniform content and to be randomly oriented. This is a document requiring authenticity in which paper or a plastic film containing no conductive fiber is laminated on at least one surface.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The conductive fiber used in the present invention is, in addition to a metal processed into a fiber form, a carbon kneaded with a resin and formed into a fiber form, or a polymer fiber formed by depositing a metal on a polymer fiber. Volume resistivity such as coated is 10 ⁴ Ω · c
m, preferably 10 ⁻² Ω · cm or less.
Paper mixed with conductive fibers used in the present invention (hereinafter referred to as mixed paper) is, for example, Japanese Patent Publication No. Sho 62-219.
19 can be obtained. That is, a bundle of conductive fibers each having a diameter of 25 μm or less is immersed in a water-soluble binder agent bath, coated with the binder agent, and dried to form a bundle of fibers having a length of 0.1 to 30 μm.
mm, the bundle is cut so as to obtain a paper dissolution solution containing a large amount of water in the latter half of the papermaking process, and dried. This mixed paper is desirably mixed with a thermoplastic aqueous binder or the like at the time of mixing to prepare for the next step.

As the thermoplastic aqueous binder, those made of polyester, polyvinyl chloride, polystyrene, saponified ethylene-copolymer, or the like, or a laminate containing two or more kinds can be used. When a thermoplastic aqueous binder is used on both sides of the mixed paper, both sides may be of the same type or different types. By laminating paper or a plastic film containing no conductive fiber on at least one surface, preferably both surfaces, of the mixed paper, a document requiring authenticity can be obtained. In addition, it is desirable to use it on both sides of the mixed paper in consideration of the appearance, durability and the like of the substrate.

As the paper to be laminated on the mixed paper, the same paper as the mixed paper or another type of paper is laminated by a usual paper making method. The plastic film to be laminated on the mixed paper is a film having a thickness of about 10 μm to 300 μm such as a polyethylene film, a polypropylene film, a polyester film, a polyamide film, and a polyvinyl chloride film, and a colored film containing an additive such as a pigment. However, it is also possible to use a transparent film, which is printed on the surface in a manner that prevents forgery. The method of laminating the mixed paper and the plastic film is performed by a method using an adhesive, a heat fusion method, or the like. In the method using an adhesive, it is bonded with a solvent-based, water-based, solvent-free, or reaction-curable adhesive such as an acrylic, rubber, urethane, or epoxy resin. The lamination method is also not particularly limited, and may be a dry lamination method, an aqueous lamination method, or the like.

[0010] As the heat fusion method, a film that can be thermally fused is used. For example, a polypropylene film, a polyvinyl chloride film or the like is used. As a lamination method, lamination is performed by an extrusion method, a film lamination method, or the like. The outer side of the document is usually printed.

[0011]

The present invention will be described below in detail with reference to examples. Example 1 FIG. 1 is an enlarged sectional view showing an embodiment of the present invention.
A mixed paper 3 having a thickness of about 50 μm is used. The mixed paper 3 is not completely dried at the time of mixing, but is kept in a water-containing state. Keeping them moist, stack these three,
When both sides were heated, pressed, and dried, a document requiring authenticity was obtained without using an adhesive. The printed layer 1, the magnetic recording layer 4, and the protective concealing layer 5 were added to this document, and cut into a suitable size to obtain a base material for a prepaid card.

Embodiment 2 FIG. 2 is an enlarged sectional view showing an embodiment of the present invention.
A mixed paper 3 having a thickness of about 50 .mu. Was subjected to a corona discharge treatment on both sides thereof to facilitate the next step.
When the 5 μm polyethylene terephthalate film 2 was bonded, a document requiring authenticity was obtained. The printed layer 1, the magnetic recording layer 4, and the protective concealing layer 5 were added to this document, and cut into a suitable size to obtain a base material for a prepaid card. Example 3 FIG. 3 is an enlarged sectional view showing an embodiment of the present invention.
A mixed paper 3 having a thickness of about 80 .mu.m was used. A white polyvinyl chloride film 1 having a thickness of about 200 .mu. And a transparent polyvinyl chloride film 2 having the same thickness were laminated on both sides, and a magnetic paint was coated on one side. The film layers 4 were overlaid, heated, pressed, cooled, and then cut to an appropriate size. As a result, a credit card base material was obtained.

[0013]

As described above, a conductive fiber-free paper, a plastic film, a polyvinyl chloride film, or the like is laminated on at least one surface of the paper mixed with the conductive fiber to obtain a conductive fiber. The fibers can be dispersed very well at random and there is no fear of damaging the fibers during kneading. The substrate of the document requiring authenticity obtained by the present invention is cut into the size of a prepaid card, and each of them is cut into 24 pieces.
Irradiating microwaves of GHz, collecting data of the reflected signal waveform, and examining the correlation coefficient between the data, the probability that the correlation coefficient becomes 0.75 or more, that is, the same The ratio of outputting such a waveform was 1/10000 to 1 / 200,000. This indicates that the dispersion condition of the conductive fiber is extremely good, and at the same time, it has been proved that the substrate of the document obtained by the present invention is necessary and sufficient for security maintenance.

[Brief description of the drawings]

FIG. 1 is an enlarged sectional view showing a substrate (document) according to Example 1 of the present invention.

FIG. 2 is an enlarged sectional view showing a substrate (document) according to a second embodiment of the present invention.

FIG. 3 is an enlarged sectional view showing a base (document) according to a third embodiment of the present invention.

[Explanation of symbols]

1-printing layer 2-paper or plastic film not containing conductive fiber 3-conductive fiber mixed paper 4-magnetic recording layer 5-protective concealment layer

Claims (3)

[Claims] 1. A document requiring authenticity, wherein a paper or a plastic film containing no conductive fiber is laminated on at least one surface of paper mixed with conductive fiber. 2. A document requiring authenticity, wherein a plastic film containing no conductive fiber is attached to at least one surface of paper mixed with conductive fiber using an adhesive. 3. A document requiring authenticity, wherein a plastic film containing no conductive fiber is bonded to at least one surface of paper mixed with conductive fiber by heat fusion.