JPH10272735A - Laminated paper containing magnetic material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To hold a magnetic material inside without using an adhesive by disposing the magnetic material on a sheet base material, laminating a sheet thereon, making it pass a nip part having two rolls with a specific linear pressure, and calendering it to integrate them. SOLUTION: A magnetic material 2 is disposed on a sheet 1 by a magnetic material spreader 6, another sheet 3 is further superposed, passed through a nip part 4 having two rolls by a linear pressure of 500 to 2500 kg/cm, and integrated without using adhesive. Thus, adhesive component is exudated in the steps of printing, punching and cutting, entangling of sheet fibers is further strengthened by applying a high pressure without contaminating an apparatus due to exudating the component. In the case of cutting or punching, fluffing of a cut surface or drop of fiber is reduced to obtain satisfactory cutting characteristics. And, in the case of recycling after use, separation of pulp from magnetic metal can be facilitated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The magnetic material-containing laminated paper of the present invention can be used for securities, securities, stamps, various certificates, banknotes, prepaid cards, cash cards, tickets, regular tickets, which are required to have high security. Tickets, toll tickets,
The present invention relates to a magnetic-material-containing laminated paper provided for use as a material for an ID card or the like.

[0002]

2. Description of the Related Art In recent years, securities, securities, stamps, various certificates, bills, prepaid cards, cash cards,
Counterfeiting of tickets, commuter passes, pass tickets, prepaid cards such as ID cards, cash cards, credit cards, ID cards and the like has become a social problem. In order to prevent forgery, printing using fluorescent ink or the like (Japanese Patent Laid-Open No. 59-13 / 1984)
No. 5451), printing using an invisible ink (JP-A-63-116286), a method using a hologram, a method using a thermochromic dye, and the like have been devised.

Attempts have been made to provide unique information by providing a magnetic card with a non-rewritable magnetic barcode or the like. For example, Japanese Patent Application Laid-Open No. 1-26
See JP-A-9227, JP-A-2-98498, JP-A-3-252901, JP-A-5-318974, and JP-A-8-55338. Attempts have also been made to prevent forgery by using a signal obtained by forming a magnetic fiber on paper and scanning it with a magnetic sensor for authenticity determination. (Japanese Unexamined Patent Publication No. 7-156
No. 583)

[0004]

However, when a magnetic fiber or the like is laid, magnetic metal, for example, a magnetic metal fiber or the like is dispersed in the thickness direction of the paper, and the depth is not constant. Therefore, it is necessary to use a special detector in which the signal output does not depend on the depth direction as the detector for the magnetic metal, or to perform accurate adjustment so that there is no individual difference in the sensitivity in the depth direction between the detectors. In addition, it was necessary to devise a method of uniformly dispersing the magnetic metal in the raw material slurry at the time of kneading. Furthermore, since magnetic metal fibers and the like exist near the surface, the magnetic metal may fall off from the surface with use, and the unique signal corresponding to the magnetic metal may change.

[0005] As a countermeasure against this, a method of placing a magnetic metal between two films or papers, bonding them with an adhesive, and laminating them is also conceivable. However, although the magnetic metal-containing film laminated by lamination using an adhesive is advantageous in terms of durability, it is difficult to reuse it after use and becomes waste containing heavy metals.
It is hardly desirable from the viewpoint of effective use of resources. Further, even when paper is used, there is a drawback in that it is not biodegradable because it uses an adhesive in the laminating step, and it is difficult to use recycled paper.

Further, when a paper or a film is bonded by using these adhesives, an adhesive applying device, a drying device, and the like are required, and further, maintenance and cleaning of the devices are troublesome. In addition, there is a danger that the adhesive component may ooze out of the cut surface in processes such as printing, punching, and cutting, thereby soiling the device and the like. Therefore, the present invention does not use an adhesive,
An object of the present invention is to provide a magnetic material-containing laminated paper having a magnetic material held therein.

[0007]

The magnetic material-containing laminated paper according to the present invention has a structure in which a magnetic material is disposed on a paper base material, paper is laminated thereon, and two papers are applied at a linear pressure of 500 to 2500 kg / cm. The paper is passed through a nip portion composed of a roll, and is integrated by performing a calendar process. Further, a powder containing a metal having a magnetic property and or a compound of the metal,
At least one of a fiber and a thin film may be used.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details will be described below. In the present invention, the term "magnetic metal" refers to "magnetic metal (iron, nickel, etc.) alone" and "magnetic metal compound (oxide, alloy, etc.)". Also,
The term "containing a magnetic metal" means "contains a metal having magnetism" or "contains a compound of a metal having magnetism (including oxides and alloys)". The magnetic material refers to a powder, fiber, or thin film containing a metal having magnetism and / or a compound of the metal.

The inventors of the present application dispose at least one magnetic material of powder, fiber, or thin film containing a magnetic metal and a compound of a magnetic metal between two or more sheets of paper, and Linear pressure between nips consisting of rolls of 500 to 25
Surprisingly, it has been found that it is possible to produce an integrated magnetic material-containing laminated paper without using an adhesive when the paper is passed at 00 kg / cm. FIG. 1 schematically shows a production process of the magnetic material-containing laminated paper of the present invention. The magnetic material 2 is arranged on the paper 1 by the magnetic material disperser 6, and another paper 3 is stacked thereon, and a linear pressure of 500 to 2500 kg /
cm, a magnetic material-containing laminated paper 5 is obtained. Normally, when a calendar process is performed on paper, a linear pressure of 200
Since it is carried out at a pressure of kg / cm or less, it was impossible to obtain an integrated laminated paper as in the present invention.

[0010] Unlike a method in which a metal fiber or the like is directly woven into paper, the magnetic material-containing laminated paper obtained by the present method has high security because the magnetic material or the like is not exposed on the surface.
In addition, there is no danger that the magnetic material or the like will fall off the surface with use and the unique signal corresponding to the magnetic material will change. The surface of the magnetic-material-containing laminated paper obtained by the present invention may be subjected to various surface treatments, for example, a water-resistant treatment, an antistatic treatment, a glossy layer, a chemical-resistant layer, and a solvent barrier layer.

The magnetic-material-containing laminated paper obtained according to the present invention can be used as a certificate, a security, etc. through a process such as printing and cutting. Further, a magnetic recording layer, a heat-sensitive recording layer and the like are provided on the magnetic material-containing laminated paper obtained by the present invention,
It can also be used for magnetic cards, prepaid cards, tickets, and the like. The magnetic material-containing laminated paper obtained by the present invention is that the main material is paper, and since no adhesive is used in the lamination process, during recycling after use,
It has excellent characteristics that it can be easily disaggregated and can easily separate pulp from magnetic metal and the like. Pulp is a desirable material from the viewpoint of effective utilization of resources because it can be used as a raw material for recycled paper.

Since the magnetic-material-containing laminated paper obtained by the present invention does not use an adhesive in the laminating process, the adhesive component permeates from the cut surface in the printing, punching, cutting and other processes. There is no need to worry about taking out and soiling the equipment. Furthermore, by applying a high pressure, the entanglement between the paper fibers becomes stronger, and in the cutting or punching process, the cut surface is less likely to be fluffed or the fibers are dropped off, so that a good cut can be obtained. Show characteristics. Therefore, when applied to applications such as magnetic cards, tickets, and securities, it can be said that the material is an excellent material that is easy to handle in the processing step.

Conventionally, a material mainly composed of paper as a base material of a magnetic card or the like is largely inferior to a material mainly composed of a plastic film in terms of surface smoothness, rigidity, and the like. However, since the magnetic material-containing laminated paper obtained by the present invention applies a high pressure that can be said to be peculiar in the laminating process, it has high smoothness even though it is a paper, and has high rigidity. Furthermore, it is suitable as a base material for a magnetic card or the like.

[0014] In addition, when a conventional paper is processed into a magnetic card, a base treatment such as a coating of a solvent barrier layer is required before applying a coating for a magnetic recording layer because the coating penetrates into the inside of the paper. It was a difficult point. On the other hand, the magnetic material-containing laminated paper of the present invention has an extremely high tension because an extremely high pressure is applied in the lamination process. For this reason, there is an advantage that a base treatment is not required because of exhibiting a high solvent barrier property exceeding a normal paper area.

When used as a base material of a magnetic card, unlike a magnetic card that is conventionally used with a plastic film such as PET as a base material, since the material is paper, the ink setting property at the time of printing is used. And it is easy to perform good printing without using a special printing method such as a UV ink or a waterless printing plate. Further, since the binding between the paper fibers is extremely strong as described above, the surface strength is high and the generation of paper dust is suppressed.

The magnetic metal in the laminated paper obtained according to the present invention can be detected using a magnetic sensor such as a magnetic head, a Hall element, an MR element, and a coil. In addition, as a detection method, detection can be performed using a metal detection sensor using ultrasonic waves, microwaves, eddy currents, or the like. One or a plurality of types of sensors can be used in combination. The detection sensor may be arranged so as to scan a part of the object to be detected, or may be arranged so as to scan a plurality of places or the whole surface.

When an object made of the magnetic material-containing laminated paper of the present invention is scanned by the magnetic metal detection sensor, an output corresponding to the distribution of the magnetic metal in the object can be obtained.
If this output is digitized and stored as unique information of each object, the object is then scanned by the magnetic metal detection sensor, and the obtained signal is compared with the previously stored unique information. By doing so, the authenticity of the object to be verified can be easily determined.

The information for collation may be stored in a collation machine,
Further, the data may be stored in another device through the network from the collator, or may be stored in the collation target itself by a method such as magnetic recording. In the step of arranging the magnetic material on the paper, the magnetic material-containing laminated paper of the present invention can be arranged in a random manner, for example, by using a method such as spraying. It is very difficult to place the body, and it takes time and cost to make forgery virtually impossible.

The pulp as a raw material for paper to be treated in the present invention is not particularly limited, but chemical pulp such as generally used softwood kraft pulp and hardwood kraft pulp, GP, TM
Mechanical pulp such as P and MP, pulp obtained from non-wood raw materials such as hemp and kenaf, waste paper pulp and the like can be used. The paper making method used in the present invention is not particularly limited, but a fourdrinier multi-cylinder paper machine, a fourdrinier Yankee paper machine, a round net paper machine, or the like can be used.

As long as the effects of the present invention are not impaired, organic and inorganic fillers and chemicals (auxiliaries) can be used in the base paper. Examples of the magnetic powder used in the present invention include metals such as iron, nickel, and cobalt, alloys such as permalloy, sendust, and stainless steel, and metal oxides such as ferrites.

As the magnetic fiber used in the present invention, a magnetic metal fiber and a fiber containing a magnetic metal can be used. As the magnetic metal fiber, although not particularly limited, iron,
A magnetic material such as a metal such as nickel and cobalt and an alloy such as permalloy, sendust, and stainless steel is processed into a fibrous shape by drawing and cutting.
The fiber length is not particularly limited, but is preferably about 100 μm to 2 cm from the viewpoint of workability in the process of arranging fibers on paper. If the fiber diameter is too small, the production cost increases. If the fiber diameter is too large, the flexibility and the surface smoothness after lamination are undesirably exerted.

As the fiber containing a magnetic metal, a fiber obtained by kneading a magnetic metal powder or a magnetic metal fine fiber with a resin and spin-drying the mixture can be used. Further, a fiber produced by dispersing magnetic metal powder or magnetic metal fine fiber in a resin solution and wet-spinning the same may be used. If the amount of magnetic metal in the fiber is too large, spinning becomes difficult, and the strength of the obtained fiber is insufficient. Conversely, if the amount of the magnetic metal is too small, it becomes difficult to detect the presence and position of the magnetic metal in the laminated paper. Therefore, although it depends on the type of resin and magnetic metal, the amount of magnetic metal in the fiber is desirably 10 to 80% by weight. If the fiber diameter is too small, spinning becomes difficult, and if the fiber diameter is too large, the flexibility and the effect on the surface smoothness after lamination are undesirable.
Is desirable. Although the material of the resin is not particularly limited, various polyolefins such as polyethylene and polypropylene, P
Various polyesters such as ET, polystyrenes, polyarylates, various acrylic resins such as polymethacrylate, various rayons, various nylons, and the like can be used.

If necessary, chemicals such as antioxidants and various pigments may be added to the fiber containing the magnetic metal. The magnetic material thin film used in the present invention is a thin film of a magnetic metal alone, a plastic film containing a magnetic metal, or a material in which a layer of a magnetic material is provided on a plastic film by a method such as vapor deposition, coating, and plating. Say. Also,
It also includes a thin film obtained by printing and applying a magnetic ink containing a magnetic material, a magnetic toner or a coating liquid on a paper substrate, and a thin film obtained by depositing or plating a magnetic metal.

The material of the magnetic material layer is not particularly limited as long as it is a substance having magnetism, and examples thereof include metals such as iron, nickel and cobalt, alloys such as permalloy and sendust, and metal oxides such as ferrites. . A soft magnetic material may be used as a magnetic material of the deposited film, and a magnetic recording can be performed on the magnetic film itself using a ferromagnetic material.

Although the material of the plastic film is not particularly limited, various polyolefins such as polyethylene and polypropylene, various polyesters such as PET, various acrylic resins such as polymethacrylate, various rayons,
Various nylons and the like can be used. The thickness of the magnetic film is not particularly limited. However, if the thickness is too large, the lamination process is hindered.

When the magnetic film is arranged on the entire surface of the paper, a sufficient adhesive strength may not be obtained in the laminating step. Therefore, it is desirable that the arrangement area of the magnetic film is kept within 80% of the paper base material. . The magnetic film may be arranged after being formed into a geometric pattern such as a stripe, a halftone dot, a polygon, a lattice, or the like by using any means. Also, any image, character, figure, or barcode may be used. The arrangement of the magnetic films may be random.

The method for arranging the magnetic powder, the magnetic fiber or the magnetic film on the paper is not particularly limited, but a method such as spraying, magnetic attraction, electrostatic attraction, coating, transfer and printing may be used. Can be done. The place to be arranged may be applied to the entire surface of the paper to be processed, or may be limited to a place corresponding only to the detection site of the detection device, or may be arranged in various figures, images, and characters. Good. The area to be arranged can be set arbitrarily as long as the adhesion is not hindered in the laminating process.
It is desirable to keep it within.

As a method of arranging magnetic fibers on paper,
A method of processing the material into a woven or nonwoven fabric in advance and then arranging it on paper may be used. The material of the magnetic substance deposited film used in the present invention may be any substance having magnetism,
Although not particularly limited, metals such as iron, nickel, and cobalt, alloys such as permalloy and sendust, and metal oxides such as ferrites may be used. A soft magnetic material may be used as the magnetic material of the deposited film, and magnetic recording can be performed on the deposited film itself using a ferromagnetic material. When a vapor-deposited film is formed on the entire surface of the paper to be processed, a sufficient adhesive strength may not be obtained in the laminating step. Therefore, it is desirable that the vapor-deposited area is kept within 80% of the paper base material. The vapor deposition may be performed in a geometric pattern such as a stripe, a halftone dot, a polygon, or a lattice by using an arbitrary means such as a mask. Also,
Arbitrary images, characters, figures, and barcodes may be used.
The deposition method is not particularly limited, and the deposition can be performed using a known method or apparatus such as ordinary deposition, sputtering, or ion plating. Instead of directly forming the vapor-deposited film on paper, it may be formed on paper using a method such as transfer.

The magnetic ink used in the present invention is not particularly limited as long as it is an ink containing a magnetic metal. The magnetic material in the magnetic ink is not particularly limited as long as it is a substance having magnetism, but metals such as iron, nickel, and cobalt and alloys thereof, alloys such as permalloy, sendust, stainless steel, and metal oxides such as ferrites are included. can give. If the content of the magnetic material in the magnetic ink is too small, detection by a magnetic sensor becomes impossible, and if it is too large, the properties of the ink are inferior. Therefore, the content of the magnetic material is preferably 5 to 80% by weight based on the solid content of the ink.

The method of arranging the magnetic ink on paper is not particularly limited, but includes printing such as offset printing, gravure printing, letterpress printing, flexographic printing, and screen printing. Alternatively, printing may be performed by an electrophotographic method using a magnetic toner as a magnetic ink, for example, using a laser printer. The printing location may be applied to the entire surface of the paper to be processed, or may be limited to the location corresponding to only the detection site of the detection device, and may be various figures, images,
It may be printed in character form. The printing area can be set arbitrarily according to the purpose and application as long as the lamination is not hindered in the lamination process. The apparatus used for performing the lamination process has a linear pressure of 500 at the nip between the rolls.
An apparatus having at least a pair of rolls capable of applying 〜2500 kg / cm is used. For example, a calendar device, a multi-stage calendar device, or the like can be used. It is desirable that the material of the roll used for pressing be a material having high hardness such as metal and ceramic. When a material having low hardness such as cotton and various rubbers is used, the nip portion is deformed by pressure, so that not only a desired pressure cannot be applied to the paper to be processed, but also the paper to be processed may be damaged.

The roll used for pressing may have an appropriate crown so that a uniform pressure is applied to the paper to be processed in the width direction. The pressure required for the laminating process may be such that the nip gap between the two rolls is fixed to generate pressure when paper passes through the nip, or the nip pressure may be controlled by a hydraulic cylinder or the like.

The step of arranging the magnetic substance on paper and the step of laminating by high-pressure treatment may be performed continuously or may be performed in separate steps. The step of arranging the magnetic material on the paper and the step of laminating may be performed in a web form, or may be cut into a sheet to be processed in a single sheet. When laminating, usually, lamination is performed on two sheets of paper.
It is also possible to stack more than one paper and perform the lamination process at once. Also, the lamination process may be repeated to laminate an arbitrary number of papers.

The nip linear pressure between the two rolls during the laminating process is desirably 500 to 2500 kg / cm. If the nip linear pressure is too high, only a part of the paper will be stretched or the fiber will be damaged, making it difficult to obtain a uniform laminated paper. Conversely, if the nip linear pressure between the two rolls is less than 500 kg / cm, sufficient adhesive strength cannot be obtained. It is also possible to perform the laminating process by heating the rolls in order to increase the effect of the pressure during the laminating process. If the surface temperature of the roll at this time is too high, blisters or bleaching of the paper due to rapid evaporation of moisture in the paper or discoloration of the paper may occur.
It is desirably 00 ° C or less.

The speed at which the paper is passed between the rolls during the laminating process varies depending on the material, thickness, moisture content, applied pressure and the like of the paper, but cannot be unconditionally determined, but is preferably from 10 to 500 m / min. The water content in the paper during the lamination process is desirably 2 to 15% in terms of the adhesive strength of the obtained laminated paper. In order to adjust the water content in the paper, the lamination process may be performed after supplying water to at least one of the bonding surfaces to wet the surface.

[0035]

【Example】

Example 1 A ferrite powder was sprayed on a Kent paper having a thickness of 100 μm in the form of a stripe having a width of 5 mm. FIG. 2 is a perspective view of the magnetic substance-containing paper of Example 1 in such a scattered state. A Kent paper having a thickness of 100 μm was stacked thereon, passed through a nip portion composed of two metal rolls at a linear pressure of 800 kg / cm, and laminated. The obtained magnetic powder-containing laminated paper was completely integrated.

When the surface of the magnetic material-containing laminated paper was scanned by a magnetic sensor using an MR element in a direction perpendicular to the stripes formed of magnetic powder, a uniform output was obtained corresponding to the position of the magnetic powder. .

Example 2 On a Kent paper having a thickness of 100 μm, a thickness of 10 μm and a length of 2
４304 mm SUS304 metal fibers were sprayed at 3000 fibers / m ² . FIG. 3 shows a perspective view of the magnetic substance-containing paper of Example 2 in such a scattered state. On top of this, a thickness of 100μ
m Kent papers were stacked, passed through a nip portion composed of two metal rolls at a linear pressure of 800 kg / cm, and laminated. The obtained magnetic fiber-containing laminated paper was completely integrated.

When the surface of the magnetic fiber-containing laminated paper was scanned by a magnetic sensor using an MR element, a uniform output was obtained corresponding to the position of the magnetic fiber. Example 3 On a Kent paper having a thickness of 100 μm, a thickness of 50 μm and a length of 2
Fibers containing magnetic powders of 4 to 4 (iron powder having an average particle size of 1 μm
(A polyester fiber containing 0% by weight) was scattered at 3000 fibers / m ² . A Kent paper having a thickness of 100 μm is placed on top of this, and a linear pressure of 80 is applied to a nip portion composed of two metal rolls.
Paper was passed at 0 kg / cm and laminated. The obtained magnetic fiber-containing laminated paper was completely integrated.

When the surface of the magnetic fiber-containing laminated paper was scanned by a magnetic sensor using an MR element, a uniform output was obtained corresponding to the position of the magnetic fiber.

Example 4 A magnetic ink (magnetic toner) was printed in bar code form on a Kent paper having a thickness of 100 μm by a laser printer. A Kent paper having a thickness of 100 μm is placed thereon, and a linear pressure of 800 kg / cm is applied to a nip portion composed of two metal rolls.
And the sheets were laminated. The obtained magnetic ink-containing laminated paper was completely integrated.

When the surface of the magnetic material-containing laminated paper was scanned by a magnetic sensor using an MR element, a uniform output was obtained corresponding to the position of the printed barcode. Example 5 25 μm thick and 5 m wide on Kent paper having a thickness of 100 μm
m of magnetic tape was placed. A Kent paper having a thickness of 100 μm was stacked thereon, passed through a nip portion composed of two metal rolls at a linear pressure of 800 kg, and laminated. The obtained magnetic material-containing laminated paper was completely integrated.

When the surface of the magnetic material-containing laminated paper was scanned by a magnetic sensor using an MR element in a direction perpendicular to the magnetic tape, a uniform output was obtained corresponding to the position of the magnetic tape.

Example 6 Ni was vapor-deposited in stripes of 5 mm width on Kent paper having a thickness of 100 μm. A Kent paper having a thickness of 100 μm was stacked thereon, passed through a nip portion composed of two metal rolls at a linear pressure of 800 kg, and laminated. The obtained magnetic material-containing laminated paper was completely integrated.

When the surface of the magnetic material-containing laminated paper was scanned by a magnetic sensor using an MR element in a direction orthogonal to the vapor-deposited stripes, a uniform output was obtained corresponding to the position of the magnetic tape.

Comparative Example 1 Pulp and stainless fiber having a length of 2 mm and a thickness of 10 μm were dispersed in water, sieved with a wire mesh, and then dried to produce a stencil paper. When the surface of the paper on which the obtained magnetic metal fibers were laid was scanned with a magnetic sensor using an MR element, an output was obtained corresponding to the position of the magnetic fibers, but the output was not constant because the depth was not constant. Was not uniform in size. Comparative Example 2 A magnetic fiber-containing laminated paper was produced in the same manner as in Example 2 except that the linear pressure was changed to 200 kg / cm. However, lamination was not complete and peeling occurred.

Comparative Example 3 A laminated sheet containing magnetic fibers was prepared in the same manner as in Example 2 except that the linear pressure was 3000 kg / cm. A phenomenon of thinning occurred and a uniform magnetic fiber-containing laminated paper could not be produced.

[0047]

According to the present invention, a magnetic material-containing laminated paper having a magnetic material held therein without using an adhesive was obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view schematically showing a manufacturing process of a magnetic-material-containing laminated paper of the present invention.

FIG. 2 is a perspective view showing the magnetic material-containing laminated paper of Example 1.

FIG. 3 is a perspective view showing a magnetic-material-containing laminated paper of Example 2.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Paper 2 Magnetic powder etc. 3 Paper 4 Nip part 5 Laminated paper 6 Magnetic sprayer

Claims (2)

[Claims] 1. A magnetic material is arranged on a paper base material, paper is laminated thereon, and the paper is passed through a nip portion composed of two rolls at a linear pressure of 500 to 2500 kg / cm to perform a calendering process. A laminated paper containing a magnetic material, characterized by being integrated by: 2. The magnetic material-containing laminated paper according to claim 1, wherein the magnetic material is at least one of a metal having magnetism and a powder, a fiber, and a thin film containing a compound of the metal.