JP3937557B2 - Paper with magnetic barcode - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a security paper, and more particularly, a magnetic bar that can easily classify a paper and improve security by reading data by a magnetic bar code provided in a contact / non-contact manner. The present invention relates to a sheet having a code.
[0002]
[Prior art]
In recent years, the accuracy of copying machines has improved significantly, and the spread of color copying machines in particular has facilitated the forgery of various securities. Means for preventing forgery against color copying have been considered. Among them, many have been proposed that use materials having glitter such as metal films and metallic gloss inks.
[0003]
Among them, the most representative copy prevention means is one using OVD (Optical Variable Device) technology such as a hologram image or a diffraction grating image that can express a stereoscopic image or a special decoration image by using light interference. .
[0004]
Among them, there are holograms such as embossed holograms that form subtle irregularities and Lippmann holograms that form interference fringes in the photosensitive material to give the image a three-dimensional effect. Since the color and the image change according to the viewing angle due to the interference, it is impossible to reproduce the image by color copy.
In addition, in order to manufacture holograms, advanced technology and large-scale equipment are required, so it is an effective means for counterfeiting such as forgery, and a credit card or ID card that requires a high anti-counterfeit effect It is also used a lot.
[0005]
Further, a technique for improving data security by giving data to a diffraction grating manufactured by a method similar to that for holograms is also known. When a laser is applied to the diffraction grating, data is converted according to the angle at which the diffracted light is reflected. Since the medium has machine-readable ID data, management that is not limited to human eyes can be performed.
[0006]
As means for sticking such OVD to an article, most conventional forming methods are sticking to a base material as a medium using a seal or a transfer foil.
[0007]
On the other hand, as an anti-counterfeiting means directly applied to securities paper, there has been proposed a method in which various anti-counterfeit items such as OVD are threaded into paper in advance. For example, as disclosed in Japanese Patent Application Laid-Open No. 7-56377, there has been proposed a method in which a pearl pigment ink or a transfer foil having a metallic luster is used to form a film and then rubbed into paper as a thread.
[0008]
[Problems to be solved by the invention]
These technologies as described above have the following problems. That is, OVD has a drawback that it is vulnerable to dirt because it is an optical counterfeit prevention measure. Moreover, since the used foil or seal | sticker can be peeled off with a solvent etc. and forged, forgery was possible. The engraving technique is an effective measure against peeling, but it is an optical counterfeit prevention measure. When data is to be provided by a diffraction grating, the data portion needs to be on the surface of the substrate. Therefore, manufacture is difficult.
[0009]
In order to solve the above problems, the present invention can read data without being affected by dirt or the like by providing a magnetic bar code on a thread inserted into a paper base material. Provided is a paper having a magnetic bar code, which has an anti-counterfeit effect capable of utilizing the technology.
[0010]
[Means for Solving the Problems]
In order to achieve the above object in the present invention, first, in claim 1, a thread formed by slitting a sheet having a magnetic bar code provided on a thread base material into a narrow width is formed on the thread base material. A forming layer, a reflective thin film layer, a magnetic barcode layer, and an adhesive layer are sequentially laminated, and the thread is arranged on the surface of the paper base material or arranged between the paper layers. It is a sheet having a magnetic barcode.
[0011]
According to a second aspect of the present invention, the magnetic material used in the magnetic bar code according to the first aspect has a coercive force of 30 Oe or less.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail.
[0014]
FIG. 1 is a plan view showing a basic configuration of a sheet 30 having a magnetic bar code according to the present invention, FIGS. 2 and 3 are sectional views thereof, and FIG. 2 is a sectional view of a portion where a thread 26 is on the surface. FIG. 3 is a cross-sectional view of a portion where the thread 26 is between the paper layers. The thread 26 is formed by sequentially laminating an OVD forming layer 22, a reflective thin film layer 23, a magnetic barcode layer 24, and an adhesive layer 25 on a thread base material 21. Although not shown in the drawing, an adhesive layer may be provided on the opposite surface (upper surface in FIG. 2) on which each layer of the thread base material 21 is provided.
[0015]
The paper base 20 used in the present invention is made by using plant fibers or synthetic fibers as raw materials, beating them in water, making them entangled, dewatering and drying them. At this time, the paper base material can obtain strength between fibers by hydrogen bonding between hydroxyl groups of cellulose as a raw material.
Also, there are clay, talc, calcium carbonate, titanium dioxide, etc. as fillers for paper, and sizing agents include rosin, alkyl ketene dimer, stearic anhydride, alkenyl succinic anhydride, wax, etc. Examples of the enhancer include modified starch, polyvinyl alcohol, polyacrylamide, urea-formaldehyde, melamine-formaldehyde, polyethyleneimine, etc. These materials are added at the time of paper making, and are mainly made by a long net paper machine. is not.
[0016]
The paper making method may be a method used in the production of ordinary plant fiber paper, and kneaded well with fibers sufficiently swollen with water-diluted raw material concentration of 0.1 to 5%, preferably 0.3 to 0.6% It is made by pouring and arranging it on a suede / mesh wire, etc., and evaporating the water by heating after squeezing.
[0017]
In addition, in the case of paper mixed with synthetic fibers other than plant fibers, since there is no binding force such as hydrogen bonding between the synthetic fibers, a binder is often required, so the synthetic fiber ratio and binding It is desirable that the amount of the agent is appropriately determined so as not to reduce the strength of the paper.
[0018]
Manufacture of threaded paper (incorporating the thread 26 into the paper base material 20) is performed by various methods. One is to insert the thread between the paper while bonding the already formed paper together. And two or more layers of wet paper are formed by a method such as circular mesh multi-tank papermaking or a combination of short nets or circular nets and long meshes, and threads are placed between the paper layers during the process of combining the wet papers together. It is classified into two kinds of methods in which the insertion is integrated.
[0019]
Here, the thread is a part including the characteristic points of the present invention.
The thread substrate 21 is made of a synthetic resin such as polyethylene terephthalate, polyvinyl chloride, polyacrylate, polyester, polycarbonate, polymethyl methacrylate, or polystyrene, which is mechanically strong and flexible or flexible, or a polymer material of natural resin. A composite comprising a plastic film, paper, or synthetic paper made of singly or in combination is used as necessary. The film generally has a thickness of 5 to 500 μm. In this case, if it is too thick, the design property as a printing paper is impaired. Therefore, the film is preferably 9 to 50 μm in thickness. Further, in order to give a metallic luster, it is necessary to impart smoothness by a calendar press method or the like because the glossiness is not achieved unless the smoothness is high regardless of the film or paper as the base material.
[0020]
The OVD formation layer 22 can be formed by heating and pressing a nickel press plate on which a fine uneven pattern constituting a relief hologram is formed on the OVD formation layer. Further, the OVD formation layer only needs to have an OVD pattern on the layer surface or in the layer. In addition, the OVD formation layer has a fine concavo-convex shape by, for example, two-beam interference or a diffraction grating (grating) by an electron beam (EB). A grating image, a Lippmann hologram, etc. are applicable.
The materials used are generally polycarbonate resins, polystyrene resins, polyvinyl chloride resins, acrylic resins, polyester resins, thermoplastic resins such as vinyl acetate resins, melamine resins, epoxy resins, urethane (meth) acrylates, polyesters. Thermoplastic resins such as (meth) acrylates, epoxy (meth) acrylates, polyol (meth) acrylates, melamine (meth) acrylates, triazine (meth) acrylates, or mixtures thereof, and heat having radically polymerizable unsaturated groups A moldable material or the like can be used, and materials other than those described above can be used as long as they can form an OVD image and have stability.
These resins are provided with a film thickness of about 0.5 to 10 μm by various coating methods such as gravure coating, and printing methods such as gravure printing and screen printing.
[0021]
The reflective thin film layer 23 is formed of a single metal such as Sn, Te, In, Al, Bi, Zn, or Pb, or an alloy or compound of these metals by a method such as vacuum deposition, sputtering, plating, transfer, or lamination. be able to. The thickness of the reflective thin film layer may be about 50 to 10,000 mm, preferably about 400 to 800 mm.
[0022]
Next, a magnetic bar code layer 24 which is a feature of the present invention is provided. Here, the magnetic barcode layer can be formed by a printing method such as gravure printing or screen printing, or a dry process such as vapor deposition or sputtering. In particular, in a dry process, barcode patterning can be provided by a mask method, a soluble ink printing method, an etching method, or the like. The soluble ink printing method is a method of printing a pattern with, for example, a water-soluble resin on a portion where vapor deposition is to be removed, and removing the printed portion of the pattern by water washing after vapor deposition. The etching method is like a resist after vapor deposition. This is a method in which a pattern is printed with a simple resin, and then unnecessary portions other than the pattern are dissolved and removed with an alkali or the like.
[0023]
Magnetic materials used include oxide magnetic materials such as Ba-ferrite, Sr-ferrite, Mn-Zn ferrite and Ni-Zn ferrite, and metals and metals such as Fe, Co, Ni, permalloy, bicalloy, and SmCo alloys. There are alloy-based magnetic materials. Among them, as an effective material, there is a magnetic material in which an alloy such as FeCoSiB, FeNiMoB, FeBSi, FeBSiC, and FeBSiCr is made amorphous by a rapid cooling method. These materials have a very high magnetic permeability and work well when sensing. If these magnetic materials are converted into inks as pigments, a printing method can be used and a target for a dry process can be used. In addition, it is desirable that the material has a low coercive force because it does not leave a history of sensing. In particular, a material of 30 Oe or less is more preferable.
[0024]
As the adhesive layer 25, a general adhesive material can be used as long as it does not alter or affect the layer in contact therewith. For example, vinyl chloride-vinyl acetate copolymer, polyester-based polyamide, acrylic-based, butyl rubber-based, natural rubber-based, silicone-based, polyisobutyl-based adhesives alone or alkyl methacrylate, vinyl ester, acrylonitrile, styrene, vinyl Necessary additives such as coagulating components such as monomers, unsaturated carboxylic acids, hydroxy group-containing monomers, modifying components such as acrylonitrile, polymerization initiators, plasticizers, curing agents, curing accelerators, and antioxidants What was added according to can be used.
The adhesive layer 25 can be formed by a known gravure printing method, offset printing method, screen printing method, or other coating method, or a barcode method, roll coating method, or the like.
[0025]
On the other hand, pulp fiber paper used as a raw material for paper base is made of wood pulp such as softwood, hardwood, rice, esparto, bagasse, hemp, flax, kenaf, cannabis, polyethylene terephthalate, polypropylene, polyacrylate, polyvinyl chloride, etc. Synthetic fiber made from plastic is fully swollen with water-diluted raw material having a raw material concentration of 0.1 to 5%, preferably 0.3 to 0.6%, by the method used for the production of ordinary plant fiber paper. It is made by thoroughly kneading the fibers, pouring them on a wire / mesh wire part, arranging them, and evaporating the water by heating after squeezing. At this time, the thread 26 is squeezed by using a wire or a mold made by cutting out a thin plate (metal etc.) fixed on the wire part, and applying the metallic luster part of the thread to this part. It is possible to scoop paper so that it hides.
[0026]
There are several methods for mechanically reading a magnetic bar code formed by the magnetic bar code layer 24, but there are mainly three methods: contact type, non-contact type, and remote type. Each is an application of existing technology, and a contact type can use a magnetic head, a non-contact type can use an MR (Magnetic Resistance) sensor or MI (Magnetic Impedance) sensor, an orthogonal 8-shaped coil pair, and the like. In the case of a remote type, an antenna can be used.
[0027]
In general, a magnetic head is provided with at least two coil portions in a head core, and a magnetic bar code portion is scanned while a direct current bias magnetic field is generated by a direct current. By this method, an output voltage corresponding to the magnetic barcode pattern can be obtained.
[0028]
The MR sensor, MI sensor, orthogonal 8-shaped coil pair, and the like are basically the same reading method as the magnetic head. In other words, a bias magnetic field is generated, and a change in the magnetic field due to the presence of a magnetic substance in the generated magnetic field is detected as a voltage. There is also a method of detecting a barcode pattern by creating a region sensitive to a magnetic field change by the antenna, and passing a magnetic barcode through that portion by a remote antenna reading method.
[0029]
【Example】
Hereinafter, specific examples of the present invention will be given and described in detail.
[0030]
<Production of thread>
An embodiment having the structure shown in FIG. 1 will be described below.
An OVD forming layer having the following composition is applied on a thread substrate made of a polyethylene terephthalate film having a thickness of 25 μm (manufactured by Toray Industries, Inc .: F65), and formed with a thickness of 2 μm after drying. OVD was formed at 160 ° C.
・ Vinyl chloride-vinyl acetate copolymer 20 parts ・ Urethane resin 15 parts ・ Methyl ethyl ketone 70 parts ・ Toluene 30 parts 【0031】
Thereafter, an Al layer having a thickness of 1000 mm was formed by a vacuum evaporation method to form a reflective thin film layer.
On top of this, a magnetic ink having the following ink composition was printed on a barcode pattern using a screen printing method to form a barcode layer.
・ Carbonyl iron powder 60 parts ・ Vinyl chloride-vinyl acetate copolymer 15 parts ・ Cyclohexanone 10 parts ・ Isophorone 10 parts ・ Solvesso 150 5 parts 【0032】
An acrylic adhesive (Toyo Morton Co., Ltd .: ADCOTE-S35) was applied to both sides of the thread film thus formed to a thickness of 4 μm after drying, and then 1.5 mm using a micro slitter. The slit was made with a width and wound around a bobbin to obtain a thread.
Thereafter, after conifer pulp was beaten in water, it was made with a wire using a hand mill, dehydrated and dried to prepare a paper (75 g / m ² ) having the magnetic bar code.
[0033]
<Machine reading>
A magnetic pattern consisting of a magnetic barcode layer was read by a DC bias applied magnetic barcode reading head. With a bias current of 10 mA, the magnetic pattern could be read as shown in FIG.
[0034]
<Copy prevention>
When the produced paper having the magnetic bar code was copied with an existing color copier, the portion appeared black due to the metallic luster of the thread portion, and the color could not be reproduced.
[0035]
【The invention's effect】
By using the paper having the magnetic bar code of the present invention, it is possible to mechanically classify the paper and to have a copy prevention effect, so it is possible to provide a highly secure paper. .
Therefore, the paper having the magnetic bar code of the present invention exhibits excellent practical effects when used as paper for various securities.
[Brief description of the drawings]
FIG. 1 is a plan view of a sheet according to the present invention.
FIG. 2 is a cross-sectional configuration diagram of a sheet of a portion where the thread portion of FIG. 1 is on the surface.
3 is a cross-sectional configuration diagram of a sheet of a portion where the thread portion of FIG. 1 is between paper layers.
FIG. 4 is a waveform read from a magnetic barcode pattern according to an embodiment of the present invention.
[Explanation of symbols]
20 ... Paper substrate 21 ... Thread substrate 22 ... OVD forming layer 23 ... Reflective thin film layer 24 ... Magnetic bar code layer 25 ... Adhesive layer 26 ... Thread 30 ... (with magnetic bar code) Paper

Claims (2)

A thread formed by slitting a sheet provided with a magnetic barcode on a thread base material is formed by sequentially laminating an OVD forming layer, a reflective thin film layer, a magnetic barcode layer, and an adhesive layer on the thread base material. What is claimed is: 1. A paper having a magnetic bar code, characterized in that the thread is arranged on the surface of a paper substrate or between paper layers .   A paper having a magnetic bar code, wherein the coercive force of the magnetic material used in the magnetic bar code according to claim 1 is 30 Oe or less.

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