JPH0647754Y2 - Base for card-like documents that require authenticity - Google Patents

Description

[Detailed Description of the Invention] [Objective of the Invention] (Industrial field of application) The present invention is applicable to securities, prepaid cards, horse race voting tickets,
The present invention relates to a base material for documents requiring authenticity such as expressway tickets, parking tickets, railway tickets, banknotes, passports, credit cards, bonds, certificates and other substitutes for banknotes.

More specifically, the present invention relates to a durable document base that does not wrinkle, warp, or wear even when it is taken in and out from a reading device a plurality of times.

(Prior Art) It is important for documents that require authenticity to have a function of preventing forgery and falsification.

As a technique for preventing such forgery and tampering, it has been proposed to hold a conductive fiber in a document (see, for example, Japanese Patent Application Publication No. 63-501250).

In this technique, conductive fibers are randomly distributed and held on a document substrate made of a non-conductive material, and the distribution state of the conductive fibers is recorded on the document by means such as magnetic recording, or Record in an external storage device. When checking the authenticity of a document, the distribution state of the fibers on the document is detected by irradiating the document with microwaves, etc. and detecting its reflection or transmission with a detector. Is compared with the recorded content that records the reference distribution state. If the document is modified or altered, the distribution state of the fibers on the document does not match the recorded content, so it can be determined that the document or the document base is not authentic.

It has been proposed to apply this technology to official documents such as banknotes, licenses, and ID cards.

(Problems to be solved by the invention) This document is a very excellent technology for preventing counterfeiting / alteration in principle, but when reading recorded information, it is generally taken in and out of a reading device using a rotating roller. In this case, if there are wrinkles or warps, there is a problem that they are not transferred into the device or are erroneously recognized. In addition, there is a problem in that the head may be misrecognized by being worn and thinned by the transfer roller and the reading head after being used a plurality of times, or the head portion may be soiled with abrasion powder.

The present invention has been made in view of the above circumstances, and provides a document substrate that is less likely to cause wrinkles and warps and has excellent abrasion resistance.

[Constitution of device]

(Means for Solving the Problems) The present invention is a substrate for a card-like document having a structure in which a plastic film is attached to both sides of a fiber structure containing conductive fibers to which a fiber technology is applied by using an adhesive. is there.

That is, one bundle of conductive fibers having a diameter of 0.025 mm or less is immersed in a water-soluble binder agent bath, coated with the binder agent, and dried to form a bundle of fibers, and the length is adjusted to 0.1 to 30 mm. A substrate for a card-like document requiring authenticity, which is obtained by cutting a bundle and adhering a plastic film on both surfaces of a conductive fiber-containing fiber structure obtained by mixing with a non-conductive fiber and water with an adhesive. .

A description will be given below with reference to the drawings.

FIG. 1 is a partial sectional view showing an embodiment of the present invention.

In FIG. 1, the plastic film 4 is not particularly limited, and polyester, polyamide, polyvinyl chloride,
There are films made of polyacrylonitrile, polycarbonate, polystyrene, polyolefin, saponified ethylene-vinyl acetate copolymer, or the like, or laminated films containing two or more kinds. Both surfaces of the fibrous structure may be films of the same kind or different kinds.

A polyester film is preferable from the viewpoint of thermal stability, dimensional stability, and rigidity.

Further, this plastic film is preferably colored in white or the like for the purpose of printing as a card-like document and for hiding the pattern of conductive fibers.
The coloring is, for example, a plastic film in which a coloring agent is kneaded, or a painted film.

The adhesive tank 3 is a thermosetting adhesive, an adhesive, a pressure sensitive adhesive, a hot melt adhesive, and further ultraviolet (UV) or electron beam (EB).
Although curable adhesives can be used, when water resistance, solvent resistance, heat resistance, etc. are required, curable adhesives are preferable, and thermosetting or UV / EB curable adhesives are selected. Be done. Further, the adhesive layer is not limited to a single layer, and two or more different types of adhesives can be used together.

It is also possible to use a means such as a sandwich lamination as a bonding means.

A known material as disclosed in Japanese Patent Publication No. 62-21919 can be applied to the fibrous structure 1 containing conductive fibers. As the non-conductive fibers, polyolefin fibers are particularly water resistant, solvent resistant, and fibrous. It is preferable in terms of price when manufacturing the structure. Further, since it becomes possible to extrude and laminate a relatively inexpensive polyolefin of the same kind, there is an advantage that the price of the card-shaped document can be further reduced. However, extrusion-laminated polyolefin is printable or
From the viewpoint of rigidity, it is not preferable to use the outermost surface of the card-shaped document substrate, and it is necessary to further laminate a polyester film for the purpose of covering this drawback. In this method, it is preferable to use an extrusion lamination method in which an anchor layer is provided on a polyester film, and then an ori-olefin is extruded and the fibrous structure is attached to the extruded lamination method since the number of steps can be minimized.

Example A 20,000 bundle of stainless steel having a diameter of 8 μm was immersed in a solution containing polyvinyl alcohol and dried at 100 ° C. Next, the bundle was cut into a length of 10 mm, and after polyethylene fiber and water were stirred, a fiber structure containing stainless fibers (thickness: 30 μm) was obtained by a known wet papermaking method. The amount of stainless fiber was adjusted to 0.7 g / m ² . Urethane-based anchor coating agent AD-335A / AD-FJ = 100 as anchor coating agent on white polyethylene terephthalate film (Lumirror E20 # 50 manufactured by Toray Industries, Inc.)
/ 6 (manufactured by Toyo Rayon Co., Ltd.) is coated and dried, low-density polyethylene is melted at 300 ° C., extruded from a T-die, and laminated on both sides of the fiber structure to obtain a card-like document substrate that requires authenticity. It was

[Brief description of drawings]

FIG. 1 is a partial sectional view showing an embodiment of the present invention. In the figure, 1 ... Card-shaped document substrate, 2 ... Conductive fiber structure, 3 ... Adhesive, 4 ... Plastic film, respectively.

Claims (6)

[Scope of utility model registration request] 1. A bundle of conductive fibers having a diameter of 0.025 mm or less is immersed in a water-soluble binder agent bath, coated with the binder agent, and dried to form a fiber bundle having a length of 0.1 to 30 mm. As described above, the bundle is cut into pieces, and a plastic film is adhered to both sides of a conductive fiber-containing fiber structure obtained by mixing with non-conductive fibers and water by using an adhesive agent. Base for card-like documents that require 2. The card-shaped document substrate according to claim 1, wherein the plastic film is a white polyester film. 3. The substrate for a card-like document according to claim 1, wherein the fiber structure in which the fibers other than the conductive fibers are polyolefin is used. 4. The adhesive is a thermosetting adhesive.
A substrate for a card-like document described in any one of 1 to 3. 5. The substrate for a card-like document according to claim 1, wherein the adhesive is an electron beam curable adhesive. 6. The card-like article according to claim 1, wherein the plastic film is a polyester film, and the fiber structure and the plastic film are laminated by heat-melting polyolefin on the polyester film provided with an anchor coat layer. Document base.