JPH11245569A - Form sheet with magnetic bar code - Google Patents

Abstract

PROBLEM TO BE SOLVED: To read data without influence of a dirt or the like and to give a forgery preventing effect by constituting to watermark threads obtained by slitting a sheet having a magnetic bar code in a fine width on a sheet base material on a thread base material. SOLUTION: Threads 26 are formed by sequentially laminating a OVD(optical variable device) forming layer 22, a reflective thin film layer 23, a magnetic bar code layer 24 and an adhesive layer 25 on a thread base material 21. A form sheet base material 20 to be used is manufactured by using vegetable fibers or synthetic fibers as a raw material, beating, entangling it under water to papermake it, then dehydrating and drying it. The layer 24 is formed by a printing method such as gravure printing, screen printing or the like or a dry process such as a vapor depositing, sputtering method or the like. As an embodiment of the magnetic material, a magnetic oxide such as a Ba-ferrite, Sr-ferrite or the like, or metal and a metal alloy magnetic material such as Fe, Co, permalloy, vicalloy or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to paper having security properties. More specifically, the present invention relates to a magnetic barcode provided by reading data in a contact / non-contact manner to easily classify the paper and to provide security. The present invention relates to a paper having a magnetic barcode with improved performance.

[0002]

2. Description of the Related Art In recent years, the accuracy of copying machines has been greatly improved, and in particular, the spread of color copying machines has facilitated forgery of various securities. Forgery prevention means for color copying have been considered, and among them, a number of methods using a material having glitter, such as a metal film or a metallic glossy ink, have been proposed.

[0003] Among them, the most typical copy protection means is OVD such as a hologram image or a diffraction grating image capable of expressing a three-dimensional image or a special decoration image using light interference.
(Optical Variable Device) technology.

[0004] Of these, holograms include embossed holograms in which an image is formed in subtle irregularities and Lippmann holograms in which interference fringes are formed in a light-sensitive material to give the image a three-dimensional effect. Since color and image change depending on the viewing angle due to light diffraction and interference, it is impossible to reproduce the image by color copying. In addition, in order to manufacture a hologram, advanced technology and large-scale equipment are required, so that it is an effective means against counterfeiting such as counterfeiting, and a credit card or ID card requiring a high anti-counterfeiting effect is required. It is also widely used.

[0005] Further, a technique for improving data security by giving data to a diffraction grating manufactured by the same method as a hologram is also known. When a laser is applied to the diffraction grating, data is generated according to the angle at which the diffracted light is reflected. Since the medium has machine-readable ID data, management not limited to human eyes can be performed.

As a means for sticking such OVD to an article, most of the conventional forming methods employ a method of sticking to a substrate as a medium using a seal or a transfer foil.

On the other hand, as a forgery prevention means for directly applying to security paper, a method has been proposed in which various forgery prevention items such as OVD are formed in a thread form in advance in paper. For example, as disclosed in JP-A-7-56377, a method has been proposed in which a pearl pigment ink or a transfer foil having a metallic luster is used to form a film and then threaded into paper.

[0008]

The above-mentioned technologies have the following problems, respectively. That is,
OVD has a drawback that it is susceptible to dirt and the like because it is an optical forgery prevention measure. Further, since the foil or seal used can be peeled off and pasted with a solvent or the like, forgery was possible. The squeezing technique is an effective measure against peeling, but is an optical counterfeit prevention measure. When trying to provide data using a diffraction grating, the data part must be exposed on the surface layer of the base material. Therefore, production is difficult.

In order to solve the above problem, the present invention provides a magnetic barcode provided on a thread laid in a paper substrate, whereby data can be read without being affected by dirt or the like. The present invention also provides a paper having a magnetic barcode, which has a forgery prevention effect capable of utilizing the prior art.

[0010]

In order to achieve the above object, according to the present invention, a sheet provided with a magnetic barcode on a thread base material is slit into a narrow width. This is a sheet having a magnetic barcode, wherein a thread is cut into a sheet substrate.

Further, in claim 2, the thread is:
2. A paper having a magnetic barcode according to claim 1, wherein an OVD forming layer, a reflective thin film layer of metal or the like, a magnetic barcode layer, and an adhesive layer are sequentially laminated on the thread base material. Things.

According to a third aspect of the present invention, there is provided a paper having a magnetic barcode, wherein the coercive force of the magnetic material used in the magnetic barcode according to the first aspect is 30 Oe or less. is there.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail.

FIG. 1 is a plan view showing a basic structure of a sheet 30 having a magnetic barcode according to the present invention.
FIG. 2 is a cross-sectional view of a portion where the thread 26 is on the surface, and FIG. 3 is a cross-sectional view of a portion where the thread 26 is between the paper layers. The thread 26 is a thread base 21
An OVD forming layer 22, a reflective thin film layer 23, a magnetic barcode layer 24, and an adhesive layer 25 are sequentially laminated. Although not shown in the figure, an adhesive layer may be provided on the opposite surface (the upper surface in FIG. 2) on which the respective layers of the thread base material 21 are provided.

The paper substrate 20 used in the present invention is prepared by using a plant fiber or a synthetic fiber as a raw material, beating it in water, entangled, dehydrated and dried. At this time, the strength between the fibers is obtained by the hydrogen bond between the hydroxyl groups of the cellulose as the raw material. In addition, as a filler used for paper, there are clay, talc, calcium carbonate, titanium dioxide, and the like.
Sizing agents include rosin, alkyl ketene dimer, stearic anhydride, alkenyl succinic anhydride, wax, etc., and paper strength agents include modified starch, polyvinyl alcohol, polyacrylamide, urea-formaldehyde, melamine-formaldehyde, polyethylene There are imine, etc., these materials are added at the time of papermaking,
The paper is mainly formed by a fourdrinier paper machine, but is not limited thereto.

The paper-making method may be a method used in the production of ordinary plant fiber paper, and a fiber sufficiently swollen with a water-diluted raw material having a raw material concentration of 0.1 to 5%, preferably 0.3 to 0.6%. Is made by kneading the mixture well, flowing it over a slender or mesh-like wire, squeezing water, and evaporating the water by heating.

Further, in the case of paper mixed with synthetic fibers other than vegetable fibers, for example, since a synthetic fiber does not have a binding force such as a hydrogen bond, a binder is required in many cases.
It is desirable that the synthetic fiber ratio and the amount of the binder are appropriately determined so as not to reduce the strength of the paper.

The production of threaded paper (making the thread 26 into the paper substrate 20) is carried out by various methods. One is to attach a thread formed between papers while laminating already formed paper. Two or more layers of wet paper are formed by a method of inserting and integrating, and a combination of a round net or a short net or a round net and a long net, and a thread is formed during the process of integrally forming each wet paper. It is classified into two types of insertion and integration between paper layers.

Here, the thread is a part including the feature of the present invention. The thread base material 21 is a polymer material of a synthetic resin or a natural resin such as polyethylene terephthalate, polyvinyl chloride, polyacrylate, polyester, polycarbonate, polymethyl methacrylate, and polystyrene, which is mechanically strong and has flexibility and flexibility. A composite of a plastic film, paper, synthetic paper, or the like consisting of a single or a combination thereof is used as necessary. The film generally has a thickness of 5 to 500 μm. In this case, if the film is too thick, the design property as printing paper is impaired.
A film having a thickness of about 50 μm is preferable. In addition, in order to obtain a metallic luster, the luster does not become high unless the smoothness is high irrespective of the film or paper used as the base material. Therefore, it is necessary to impart smoothness by a calendar press method or the like.

The OVD forming layer 22 can be formed by heating and pressing a nickel press plate on which a fine concavo-convex pattern constituting a relief type hologram is formed to the OVD forming layer. The OVD-forming layer may be a material having an OVD pattern on the layer surface or in the layer. In addition, the OVD-forming layer may have a fine uneven shape by, for example, a two-beam interference or a diffraction grating (grating) by an electron beam (EB). A grating image, a Lippmann hologram, or the like is applicable. Materials used are generally thermoplastic resins such as polycarbonate resin, polystyrene resin, polyvinyl chloride resin, acrylic resin and polyester resin, vinyl chloride resin, melamine resin, epoxy resin, urethane (meth) acrylate, polyester Thermoplastic resins such as (meth) acrylate, epoxy (meth) acrylate, polyol (meth) acrylate, melamine (meth) acrylate, and triazine (meth) acrylate, or mixtures thereof, and heat having a radical polymerizable unsaturated group. A moldable material or the like can be used, and materials other than those described above can be used as long as the material can form an OVD image and has 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.

As the reflective thin film layer 23, Sn, Te,
A single metal such as In, Al, Bi, Zn, and Pb, or an alloy or compound of these metals can be formed by a method such as vacuum evaporation, sputtering, plating, transfer, and lamination. The thickness of this reflective thin film layer is 50 to 10
It may be about 000 °, preferably about 400-800 °.

The magnetic barcode layer 24 which is a feature of the present invention.
Is provided next. 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 evaporation or sputtering. In particular, in the dry process, the barcode can be patterned by a mask method, a soluble ink printing method, an etching method, or the like. The soluble ink printing method is a method in which a pattern is printed on a portion where removal of vapor is to be removed, for example, with a water-soluble resin and the like, and the printed portion of the pattern is removed by water washing after the vapor deposition. This is a method of printing in a pattern with a suitable resin, and then dissolving and removing unnecessary portions other than the pattern with an alkali or the like.

The magnetic materials used include Ba-ferrite, Sr-ferrite, Mn-Zn ferrite, and N-ferrite.
Oxide magnetic materials such as i-Zn ferrite, Fe, Co,
There is a metal / metal alloy based magnetic material such as Ni, permalloy, baicaloy, and SmCo based alloy. Among the effective materials, there are magnetic materials in which alloys such as FeCoSiB, FeNiMoB, FeBSi, FeBSiC, and FeBSiCr are amorphously formed by a quenching method. These materials have a very high magnetic permeability and work advantageously when performing sensing. If these magnetic materials are made into inks as pigments, a printing method can be used, and a target for a dry process can be used. As a property of the material, a material having a low coercive force is preferable because it does not leave a history of sensing. In particular, a material of 30 Oe or less is more preferable.

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. For example, vinyl chloride-vinyl acetate copolymer, polyester-based polyamide, acrylic, butyl rubber-based, natural rubber-based, silicone-based, polyisobutyl-based pressure-sensitive adhesive alone or alkyl methacrylate, vinyl ester, acrylonitrile, styrene, vinyl Requires aggregation components such as monomers, unsaturated carboxylic acids, hydroxy-containing monomers, modifying components such as acrylonitrile, and additives such as polymerization initiators, plasticizers, curing agents, curing accelerators, and antioxidants. Can be used according to the above. For forming the adhesive layer 25, a known printing method such as a gravure printing method, an offset printing method, a screen printing method, or a coating method such as a barcode method or a roll coating method can be used.

On the other hand, pulp fiber paper used as a raw material of the paper base material includes coniferous and hardwood, rice, esparto, bagasse, hemp, and the like.
Wood pulp such as flax, kenaf and cannabis, and synthetic fibers made from plastics such as polyethylene terephthalate, polypropylene, polyacrylate, and polyvinyl chloride are used in a method used for the production of ordinary plant fiber paper. 0.1-5%, preferably 0.3-0.6%
Fibers sufficiently swollen with the water-diluted raw material are well kneaded, flown on a sudare / mesh-shaped wire part, arranged, squeezed, and heated to evaporate water. At this time, a wire or a thin plate (metal or the like) is used to insert the thread 26.
The mold made by cutting out the wire is fixed on the wire part and used as a sieving net. The metallic glossy part of the thread can be applied to this part and the paper can be squeezed so that it is hidden.

There are several methods of mechanically reading the magnetic barcode formed by the magnetic barcode layer 24, but there are three general methods: contact type, non-contact type, and remote type. Each is an application of existing technology, contact type magnetic head, non-contact type MR (MagneticResistance) sensor and M
An I (Magnetic Impedance) sensor, an orthogonal figure-8 coil pair and the like can be used. In the case of a remote type, an antenna can be used.

The magnetic head has at least two head cores.
A general method is to provide a single coil portion and scan a magnetic barcode portion while generating a DC bias magnetic field by a DC current. With this method, an output voltage corresponding to the magnetic barcode pattern can be obtained.

The reading method for the MR sensor, the MI sensor, the orthogonal figure-8 coil pair and the like is basically the same as that of the magnetic head. That is, a method of generating a bias magnetic field and detecting a change in the magnetic field due to the presence of a magnetic substance in the generated magnetic field as a voltage. As a reading method using a remote antenna, there is a method in which a region sensitive to a magnetic field change is created by the antenna, and a barcode pattern is detected by passing a magnetic barcode through the region.

[0029]

The present invention will now be described in detail with reference to specific examples.

<Manufacture of Thread> An embodiment having the structure shown in FIG. 1 will be described below. An OVD-forming layer having the following composition was applied to a 25 μm-thick polyethylene terephthalate film (manufactured by Toray Industries, Inc .: F65) thread substrate and formed to 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

Thereafter, an Al layer having a thickness of 1000 ° was formed by a vacuum evaporation method to form a reflective thin film layer. On top of that, 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

An acrylic adhesive (AD: Toyo Morton Co., Ltd.) is applied to both sides of the thread film thus produced.
(COTE-S35) was dried and applied to a thickness of 4 μm, slit with a microslitter to a width of 1.5 mm, and wound on a bobbin to obtain a thread. Thereafter, the softwood pulp was beaten in water, made into a wire using a handmade device, dehydrated and dried to prepare a paper (75 g / m ² ) having the magnetic barcode.

<Mechanical Reading> A magnetic pattern consisting of a magnetic barcode layer was read by a DC bias applying type magnetic barcode reading head. At a bias current of 10 mA, the magnetic pattern could be read as shown in FIG.

<Prevention of Copying> When the prepared paper having the magnetic barcode is copied by an existing color copier, the color is reproduced black due to the metallic luster of the thread portion. could not.

[0035]

By using the paper having the magnetic barcode of the present invention, the paper can be classified mechanically, and also has a copy protection effect. Can be provided. Therefore, the paper having the magnetic barcode 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 a thread portion of FIG.

FIG. 3 is a cross-sectional configuration diagram of a sheet in a portion where a thread portion in FIG.

FIG. 4 is a waveform read from a magnetic barcode pattern according to one embodiment of the present invention.

[Explanation of symbols]

 20 paper base 21 thread base 22 OVD forming layer 23 reflective thin layer 24 magnetic barcode layer 25 adhesive layer 26 thread 30 (with magnetic barcode ) Paper

Claims (3)

[Claims] 1. A sheet having a magnetic barcode, wherein a thread formed by slitting a sheet having a magnetic barcode provided on a thread base material into a narrow width is cut into a paper base material. 2. The thread according to claim 1, wherein an OVD forming layer, a reflective thin film layer of a metal or the like, a magnetic barcode layer, and an adhesive layer are sequentially laminated on the thread base material.
Paper having the magnetic barcode described in the above. 3. A paper having a magnetic barcode, wherein the coercive force of the magnetic material used for the magnetic barcode according to claim 1 is 30 Oe or less.