KR101147912B1 - Security paper - Google Patents

Abstract

In order to prevent theft and loss of an article, a security paper provided with a metal detection layer or a metal ink print layer identifiable by metal detection and / or X-ray search is provided.

Security paper according to the present invention, the first sheet is exposed to the outside; A metal detection layer formed by depositing or coating a metallic material identifiable by metal detection directly on the surface of the first sheet; And a second sheet exposed to the outside covering the metal detection layer so that the metal detection layer deposited on the first sheet is not exposed to the outside.

According to such a security paper, it is not recognized as a means to prevent leakage of confidential matters, which can effectively prevent unauthorized removal of security items, and can be easily distinguished from other items when X-ray search or metal detection is performed. Since there are a variety of ways to use it has the advantage of ease of use. In addition, even when using the security paper for printing or copying can minimize the paper jam phenomenon and the security paper is not easily deformed by moisture or heat.

Security paper, theft, take out, metal deposition, metal coating, metal ink, metal detection, X-ray

Description

Security paper having a metal detection layer or a metal ink printing layer

The present invention relates to a security paper for preventing theft and loss of the article, and more particularly to a security paper having a metal detection layer or a metal ink printing layer to be identifiable by metal detection and / or X-ray search. It is about.

In order to prevent the company's confidential expenses from leaking outside, documents, books or information storage media (for example, CDs, DVDs, USBs, floppy disks, etc.) containing the company's confidential expenses are prohibited from being exported outside the company. have. In this case, generally, a detection label is attached to the book or the information storage medium so that external transport can be detected, and a detector for detecting the detection label is provided near the entrance. Therefore, when a person exports the above document, book or information storage medium outside the company without the approval of the company, the detector detects the detection label attached to the document, book or information storage medium and generates an alarm sound. The document, book or information storage medium will be notified to the outside.

In addition, books or articles displayed in large stores such as department stores are also attached with anti-theft detection labels in the form of rolls or sticks to prevent visitors from carrying out the articles without permission. Even in this case, a detector is installed around the doorway to prevent unauthorized release of books or items that have not been calculated.

With reference to the accompanying drawings will be described in detail a conventional sensing label.

1 is a schematic use state diagram of a conventional detection label and detector.

As illustrated in FIG. 1, a sensing label 1 is attached to a book 2 that stores a company's confidential expenses or displayed in a library or a bookstore, and detectors 3 and 4 are installed at an entrance side.

The visitor carries a book (2) with a detection label (1) attached therebetween, and a sensing coil (not shown) is built in between the transmitter (3) and the receiver (4) of the detector installed so as to face each other at a predetermined interval. When passing through, the radio wave transmitted from the transmitting device 3 is modulated and received by the receiving device 4 by the sensing label 1 which is a magnetic substance attached to the book 2.

Accordingly, the controller 5 electrically connected to the above-described transmitter 3 and receiver 4 generates an alarm sound through the speaker 6 or lights up a lamp, not shown, so as to be normally approved for carrying out. Or it can be confirmed that the item is not calculated.

However, since the sensing label 1 is attached to the cover of the book 2 or the article and is directly exposed to the outside, the sensing label 1 is caused by contact with other objects in the process of using the book 2 by the user. This damage and separation, or the user can easily remove or damage the detection label (2) by malicious, if the detection label (1) is damaged or separated in this way, the book (2) There is a problem that unauthorized export is not detected.

In addition, the conventional sensing label 1 has the same reaction as that of other metal articles when detected by the detectors 3 and 4, and thus the book 2 to which the articles sensed by the detectors 3 and 4 are carried out without permission. There is a disadvantage that it is difficult to distinguish whether it is a cognitive or a general metal article.

In addition, in order to detect the detection label 1, as shown in FIG. 1, the transmitter 3 and the receiver 4 must be installed to face each other, thereby limiting the installation space and increasing installation costs. The disadvantage is that it costs.

In order to solve this problem, the applicant is attached to cover both sides or the entire outer surface of the metal sheet so that the patent application 2006-0029329 (patent registration No. 704989) can be identified by metal detection or X-ray search. A security paper including a sheet has been proposed.

2 shows the security paper 10 proposed by the applicant in the patent application No. 2006-0029329 (patent registration No. 704989).

As shown in FIG. 2, the security paper 10 of the patent includes a metal sheet 22 that can be identified by metal detection or X-ray search, and a sheet 21 that covers both sides of the metal sheet 22. , 23, and the metal thin plates 22 and the sheets 21 and 23 are attached to each other by an adhesive.

Since the security paper according to the patent uses the metal thin plate 22, it is useful for metal detection or X-ray retrieval, and the metal thin plate 22 is not exposed to the outside, so it is difficult for a user to recognize that the paper is secure. When printing or copying to record the security information on the security paper 10, there is a possibility that a paper jam occurs in the printer or copier. That is, the security paper 10 according to the patent attaches the metal thin plate 22 of about 2 to 20 microns (usually 6 microns) between the sheets 21 and 23 because of the physical properties of the metal thin plate 22 itself. If the security paper 10 is stiff and this causes the paper jam to occur when used in a printer or copier, there is a disadvantage that waste of the security paper and damage to the printer / copier may occur.

In addition, the security paper 10 according to the patent has a large difference in physical properties due to the moisture generated in the air or the heat generated when using a copier / printer because the sheets 21, 23 and the metal thin plate 22 is attached to each other by an adhesive Deformation occurs between the sheets 21 and 23 and the metal thin plate 22, or the adhesive force of the adhesive is weakened, and the sheets 21 and 23 and the metal thin plate 22 may be peeled off.

In addition, since the security paper 10 according to the patent is provided with a metal thin plate 22 of a predetermined thickness, the warp phenomenon of the security paper 10 itself may occur, and thus the user may recognize that the security paper is a security paper.

 Therefore, a new type of security paper that can solve the disadvantages of the conventional security paper 10 is required.

The present invention has been proposed to solve the above problems, it is not recognized as a security means for preventing the leakage of confidential matters in appearance, it is easy to distinguish from other metal items and other products when searching, easy to use security paper The purpose is to provide.

In addition, an object of the present invention is to provide a security paper that can minimize the paper jam phenomenon even when using a copy machine or a printer.

In addition, an object of the present invention is to provide a security paper that is resistant to moisture and heat and that the sheet does not easily peel off.

As one aspect for achieving the above object, the present invention is a first sheet exposed to the outside; A metal detection layer formed by depositing or coating a metallic material identifiable by metal detection directly on the surface of the first sheet; And a second sheet exposed to the outside covering the metal detection layer so that the metal detection layer deposited on the first sheet is not exposed to the outside. Provides a security paper comprising a. In this case, the metallic material forming the metal detection layer may be identified by metal detection and X-ray search.

In addition, the present invention is a first sheet; A metal detection layer formed by depositing or coating a metallic material identifiable by X-ray search on the surface of the first sheet; And a second sheet covering the metal detection layer so that the metal detection layer deposited on the first sheet is not exposed to the outside.

Preferably, the metal detection layer may be formed over the entire surface of the first sheet, or alternatively, may be formed over a portion of the surface of the first sheet to have a unique identification pattern.

More preferably, the metal detection layer may be formed by depositing or coating one or more materials of aluminum, gold, silver, copper, or a compound including at least one of them.

Also preferably, the metal detection layer may be configured to be covered with a coating layer that is visible light impermeable and X-ray transmissive.

In another aspect, the present invention provides a display device comprising: a first sheet exposed to the outside; A metal ink print layer on which a metal ink including a metallic material identifiable by metal detection is printed directly on the surface of the first sheet; And a second sheet covering the metal ink print layer so that the metal ink print layer is not exposed to the outside and exposed to the outside. In this case, the metallic material forming the metal ink print layer may be identified by metal detection and X-ray search.

In addition, the present invention, the first sheet; A metal ink print layer formed by printing a metal ink including a metallic material identifiable by X-ray search on the surface of the first sheet; And a second sheet covering the metal ink print layer so that the metal ink print layer is not exposed to the outside.

Preferably, the metal ink print layer may be formed on the entire surface of the first sheet, or alternatively, may be formed over a portion of the surface of the first sheet to have a unique identification pattern.

In this case, the metal ink print layer may be formed by printing a metal ink including one or more materials of aluminum, gold, silver, copper, or a compound including at least one of these materials.

In addition, the metal ink printing layer may be configured to be covered with a coating layer that is visible light impermeable and X-ray transmissive.

On the other hand, in the security paper according to the present invention, the second sheet may be made of a release paper detachable by being adhered by the pressure-sensitive adhesive.

Also preferably, a release paper that may be attached and detached by an adhesive may be attached to a surface of the first sheet or the second sheet.

Security paper according to an aspect of the present invention can be identified by metal detection and / or X-ray search can prevent the leakage of confidential matters, and apparently not recognized as a means for preventing leakage of confidential matters Intentional removal of the metal detection and / or X-ray search part is prevented, thereby effectively preventing unauthorized removal of the security article.

In addition, the security paper according to an aspect of the present invention can obtain the effect that the metal detection layer or the metal ink printed layer has a certain identification pattern, it is easy to distinguish from other items during the X-ray search.

In addition, according to an aspect of the present invention, by using a release paper, it is possible to attach a security paper to a variety of security holding articles such as documents, disks, CD-ROM, it is easy to use and has a wide range of applications.

In addition, according to an aspect of the present invention, unlike conventional security paper, paper jamming phenomenon even when using a copier or a printer because the metal is deposited directly on the sheet or printed with a metal ink, without using a metal thin plate having stiff physical properties. The effect can be minimized.

In addition, while the conventional security paper is attached to the sheet on both sides of the metal foil by using an adhesive, the security paper according to an aspect of the present invention is configured to attach another sheet to the sheet on which the metal is deposited or the metal ink is printed. Have Therefore, according to an aspect of the present invention, since the surface to be attached by using the adhesive is reduced compared to the conventional and the sheet and the sheet having a large difference in physical properties are attached, not only the deformation due to moisture or heat can be minimized, but also Not only can the consumption be reduced, but the adhesion process is reduced, so that the manufacturing process is simplified. In addition, the security paper according to an aspect of the present invention has an effect that the warpage phenomenon is unlikely to be recognized as a security paper because the warpage phenomenon hardly occurs unlike the conventional security paper due to the presence of the metal foil.

Hereinafter, with reference to the accompanying drawings looks at an embodiment of the security paper according to the present invention.

3 is an exploded perspective view of the security paper according to the first embodiment of the present invention, Figure 4 is a cross-sectional view of the security paper shown in Figure 3, Figure 5 is a security paper according to a modification of the first embodiment of the present invention 6 to 8 are cross-sectional views of the security paper according to another modification of the first embodiment of the present invention. 9 is a plan view of a security paper according to a second embodiment of the present invention, FIG. 10 is a sectional view of the security paper shown in FIG. 9, and FIG. 11 is a security paper according to a modification of the second embodiment of the present invention. 12 and 13 are explanatory views showing an example of use of the security paper according to the present invention.

First, the security paper 100 according to the first embodiment of the present invention will be described with reference to FIGS. 3 to 8, 12, and 13.

3 and 4, the security paper 100 according to the present invention may be identified by at least any one of a first sheet 110 exposed to the outside, a metal detection, and an X-ray search. The metal detection layer 120 formed by depositing or coating a metallic material directly on the surface of the first sheet 110 and the metal detection layer 120 deposited on the first sheet 110 may not be exposed to the outside. Covering the metal detection layer 120, and includes a second sheet 130 exposed to the outside.

In the security paper 100 according to the present invention, since the second sheet 130 covers the metal detection layer 120 identified by metal detection and / or X-ray search, the document, book or information storage medium is carried out. It will not be recognized as a means for preventing the export to prevent.

The first sheet 110 and the second sheet 130 may be a sheet of synthetic resin as well as paper of various materials such as plain paper, glossy paper, art paper, color paper. However, when the security paper 100 according to the present invention is applied to a booklet in terms of not using the same material as the general paper of the booklet or using the same material as a general office paper, it is not recognized that the security paper 100. desirable. In addition, the sheets 110 and 130 may print or copy various letters, symbols, drawings, drawings, and the like, as commonly used paper, and the user may write and memo using various writing instruments such as a pencil or a ballpoint pen. Is preferred. On the other hand, the first sheet 110 and the second sheet 130 may be used different materials depending on the purpose of the security paper (100).

Meanwhile, the metal detection layer 120 is formed by depositing or coating one or more materials of aluminum, gold, silver, copper, or a compound containing at least one of these materials so as to enable metal detection and / or X-ray retrieval. Can be. However, if either metal detection or X-ray search is possible, the metallic material forming the metal detection layer 120 is not limited to the above-mentioned materials, and may include iron or various nonferrous metals. On the other hand, metal deposition and metal coating is somewhat different in the manufacturing process, for convenience of description, in the present specification, the metal deposition layer formed by the metal deposition of the metal detection layer 120 and the metal coating layer formed by coating a metal material It is defined by the concept of inclusion. Deposition of such a metal or coating of a metal material is well known, so a detailed description thereof will be omitted.

Since the metal detection layer 120 can be formed with an extremely thin thickness unlike a metal thin plate having a conventional stiff physical property, even if formed between the first and second sheets 110 and 130, the user is extremely difficult to recognize the security. The effect can be maximized. That is, since the thickness of the metal detection layer 120 is significantly thinner than the conventional metal thin plate, the security paper according to the present invention is soft like ordinary paper, and unlike the conventional security paper having the metal thin plate, the warpage phenomenon is reduced. It is light and has the advantage of minimizing paper jams when recording security information using a printer or copier.

In addition, the thickness of the metal detection layer 120 may be generally formed to 200 ~ 3000Å, it can be adjusted according to the sensitivity of the X-ray detection equipment or metal detection equipment. At this time, the metal detection layer 120 may be formed with a low thickness of 200 ~ 400Å (although there may be a slight difference depending on the process) in the process of one time metal deposition or metal coating, X-ray detection equipment or metal detection In consideration of the sensitivity of the equipment, it is more preferable to increase the thickness of the metal detection layer 120 through a plurality of processes.

On the other hand, the first sheet 110 and the second sheet 130 on which the metal detection layer 120 is formed may be bonded by an adhesive, or may be combined by a thermocompression bonding or a high frequency bonding method without an adhesive. . The attachment structure of the first sheet 110 and the second sheet 130 is not limited to a specific method, and any one of various types of attachment / bonding methods that are commercially available may be used.

As such, when the security paper 100 according to the embodiment of the present invention is bonded to the first sheet 110 and the second sheet 130 on which the metal detection layer 120 is directly formed, the metal sheet is completed. Since the number of adhesive surfaces is reduced in comparison with the conventional security paper using, there is an advantage that the manufacturing process is simplified and the use of the adhesive is reduced.

In addition, the security paper 100 according to the present invention has a large difference in physical properties between the first sheet 110 and the conventional second sheet 130 on which a metal detection layer is formed, unlike a security paper using a conventional metal sheet. Since the sheets 110 and 130 are not attached, deformations due to moisture or heat can be minimized.

The security paper 100 according to the present invention configured as described above may be used as a confidential document describing minutes or important matters only by the paper itself, and also used as a drawing paper for outputting drawings, various output papers and memo papers, etc. It can be used for a variety of purposes, such as for the office to prevent leakage to the outside.

For example, when the first and second sheets 110 and 130 are applied to a commonly used paper, the security paper 100 according to the present invention is recognized as a plain paper in appearance, so that the bookshelf of a book to prevent unauthorized carrying out (I.e., it can be used as a book cover, slip sheet or inlay) (it is also possible to construct a large number of slip sheets or inlays). As such, when the security paper 100 is used as one of the bookshelves, it is difficult to determine which bookshelf plays a role of the export prevention means, thereby preventing the removal of the prevention means by the person who wants to take out the book without permission. do. Therefore, when the security paper 100 according to the present invention is used as at least a part of a plurality of bookcases, an effect of suppressing unauthorized carrying out of books is obtained.

In addition, the first and second sheets 110 and 130 may be made of copy protection paper to prevent the printed or described security contents from being copied and carried out. In order to prevent copying as described above, at least one of the first and second sheets 110 and 130 is configured to have a latent image display effect, that is, a latent image pattern is formed so that a character or an image representing a copy is displayed upon copying. Can be.

In addition, the first and second sheets 110 and 130 may have a reflective layer formed on an outer surface of the first and second sheets 110 and 130 so that copying is prevented because the radiant light of the copier is reflected on the reflective layer during copying.

Meanwhile, the metal detection layer 120 may be formed on the entire surface of the first sheet 110, as shown in FIGS. 3 and 4.

However, when the metal detection layer 120 is formed in a flat shape as shown in FIG. 3, since the security paper 100 appears in a rectangular shape when X-ray scanning is performed, it is difficult to distinguish it from a rectangular metal product. May occur. In particular, when the leather is photographed by X-rays, since the brightness and saturation are almost similar to those of the metal detection layer 120 applied to the present invention, there is a problem that it is difficult to distinguish it from a rectangular wallet.

Therefore, the metal detection layer 120 applied to the present invention is part of the surface of the first sheet 110 so that it can be clearly distinguished from metal products, leather wallets, etc. when the X-ray is searched as shown in FIG. 5. And may be configured to have a unique identification pattern 125. The metal detection layer 120 may be formed by treating a portion of the surface of the first sheet 110 to prevent deposition or coating.

Although FIG. 5 illustrates an example in which the unique identification pattern 125 is formed of letters, the identification pattern 125 may be formed in various patterns such as numbers, figures, various patterns, and bands.

As such, since the thickness of the metal detection layer 120 is extremely thin, a portion of the unique identification pattern 125 may not be recognized externally because of unevenness even when the second sheet 130 is attached, and printing or copying is also stable. It can be performed as.

On the other hand, when the metal detection layer 120 is formed only in a partial region of the first sheet 110, when the security paper 100 is reflected in visible light such as sunlight or illumination light, the metal detection layer 120 is formed and formed. Since the visible light transmittance of the portion which is not is different, there is a possibility of visually recognizing the presence or absence of the metal detection layer 120.

Therefore, when the metal detection layer 120 is formed only on a part of the first sheet 110, as shown in FIG. 6, the metal detection layer 120 may be formed of a material having visible light impermeability and X-ray transmission. It may have a configuration covered with the coated coating layer 140.

When the coating layer 140 is covered on the metal detection layer 120 as described above, even when the security paper 100 is reflected on visible light, the identification pattern 125 or the metal detection layer 120 is not visually recognized. Therefore, it becomes difficult to distinguish the security paper 100 from general paper. In this case, since the X-ray coating layer 140 is made of a transparent material, when the X-ray search is performed, it is possible to identify a portion where the identification pattern 125 is formed and a portion that does not.

On the other hand, as shown in Figure 7, the security paper 100 according to an embodiment of the present invention, the second sheet 130 is a release paper (Releas paper, which is detachably adhered by the adhesive 150) It may be made of.

In addition, as shown in FIG. 8, a separate release paper 160 using an adhesive 150 on the surface of the first sheet 110 or the second sheet 120 of the security paper 100 shown in FIG. 6. It is also possible to configure a detachable adhesive.

As described above, the security paper 100 according to the present invention uses a pressure-sensitive adhesive 150 after separating the second sheet 130 or the separate release paper 160 which is a release paper, or the booklet 310 shown in FIG. 13 may be attached to various information storage media such as the CD-ROM 320 and a floppy disk. That is, the security paper 100 according to the present invention may be used as a label of the booklet 310 or the information storage medium 320 so as not to be easily determined by the user.

Next, the security paper 200 according to the second embodiment of the present invention will be described with reference to FIGS. 9 to 13.

9 to 11 is identified by at least one method of metal detection and X-ray search instead of the metal detection layer 120 of the security paper 100 according to the first embodiment. It is the same as the first embodiment except that a metal ink including a possible metallic material is formed by directly printing on the surface of the first sheet 210.

That is, the security paper 200 according to the second embodiment of the present invention is the first sheet 210 exposed to the outside as shown in Figs. 9 and 10 and the metal ink printing directly formed on the surface of the first sheet A layer 220 and a second sheet 230 covering the metal ink print layer 220 and exposed to the outside are configured.

The metal ink print layer 220 may be formed on the entire surface of the first sheet 210. Alternatively, the metal ink print layer 220 may be formed over a portion of the surface of the first sheet 210 as illustrated in FIGS. 9 to 11. It may have a unique identification pattern.

That is, the metal ink print layer 220 may be formed of various patterns such as numbers, figures, various patterns, and bands so that the metal ink print layer 220 may be clearly distinguished from metal products or leather wallets when searched by X-rays.

The metal ink print layer 220 may be formed by printing a metal ink including at least one material of aluminum, gold, silver, copper, or a compound including at least one of the materials on the surface of the first sheet 210. have. However, if either metal detection or X-ray search is possible, the metallic material forming the metal ink print layer 220 is not limited to the above-described materials, and may include iron or various nonferrous metals.

In this case, as shown in FIG. 10, the metal ink print layer 220 may be absorbed and formed in the first sheet 210, but the surface of the first sheet 210 may be thinned according to the physical properties of the metal ink. It is also possible to cover with thickness.

Meanwhile, as shown in FIG. 11, the metal ink print layer 220 of the security paper 200 is covered with a coating layer 240 coated with a material having visible light impermeability and X-ray transparency. Can have As such, when the coating layer 240 is formed, even when the metal ink print layer 220 is formed only on a part of the first sheet 210, the security paper 100 may be secured even if the security paper 100 is reflected in visible light such as sunlight or illumination light. There is an advantage that it is difficult to distinguish 200 from plain paper.

In addition, the security paper 200 according to the second embodiment also functions as a release paper of FIG. 7 so that it can be used as a label of an information storage medium such as the booklet 310 of FIG. 12 or the CD-ROM 320 of FIG. It is also possible to have two sheets 120 or the release paper 160 attached separately in FIG. 8.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the appended claims. It will be understood that the invention may be varied and varied without departing from the scope of the invention.

1 is a schematic use state diagram of a conventional detection label and detector.

Figure 2 is an exploded perspective view showing a security paper filed in the prior application of the present application.

3 is an exploded perspective view of the security paper according to the first embodiment of the present invention.

4 is a sectional view of the security paper shown in FIG.

5 is a plan view of a security paper according to a modification of the first embodiment of the present invention.

6 to 8 are cross-sectional views of the security paper in another modification of the first embodiment of the present invention.

9 is a plan view of a security paper according to a second embodiment of the present invention.

10 is a cross-sectional view of the security paper shown in FIG.

11 is a cross-sectional view of the security paper according to a modification of the second embodiment of the present invention.

12 and 13 are explanatory diagrams showing an example of use of the security paper according to the present invention.

<Description of the symbols for the main parts of the drawings>

100,200 ... Security paper 110,210 ... First sheet

120 ... metal detection layer 130,230 ... second sheet

140,240 ... Coating layer 150 ... Release paper adhesive

160 ... release paper 220 ... metal ink printing layer

Claims (16)

A first sheet exposed to the outside; A metal detection layer formed by depositing or coating a metallic material identifiable by metal detection directly on the surface of the first sheet; And A second sheet covering the metal detection layer such that the metal detection layer deposited on the first sheet is not exposed to the outside and exposed to the outside; Security paper comprising a. The method of claim 1, The metallic material forming the metal detection layer may be identified by metal detection and X-ray search. delete The method according to claim 1 or 2, And the metal detection layer is formed on the entire surface of the first sheet. The method according to claim 1 or 2, And the metal detection layer is formed over a portion of the surface of the first sheet to have a unique identification pattern. The method according to claim 1 or 2, The metal detection layer is a security paper, characterized in that formed by depositing or coating a compound containing at least one of aluminum, gold, silver, copper or at least one of them. The method according to claim 1 or 2, And the metal detection layer is covered with a coating layer having visible light impermeability and X-ray transmission. A first sheet exposed to the outside; A metal ink print layer on which a metal ink including a metallic material identifiable by metal detection is printed directly on the surface of the first sheet; And A second sheet covering the metal ink print layer so that the metal ink print layer is not exposed to the outside and exposed to the outside; Security paper comprising a. The method of claim 8, And the metallic material forming the metal ink print layer is identifiable by metal detection and X-ray search. delete 10. The method according to claim 8 or 9, And the metal ink print layer is formed on the entire surface of the first sheet. 10. The method according to claim 8 or 9, And the metal ink print layer is formed over a portion of the surface of the first sheet to have a unique identification pattern. 10. The method according to claim 8 or 9, The metal ink print layer is formed by printing a metal ink including at least one material of aluminum, gold, silver, copper or a compound containing at least one of them. 10. The method according to claim 8 or 9, And the metal ink print layer is covered with a coating layer having visible light impermeability and X-ray transmission. The method according to any one of claims 1, 2, 8, and 9, The second sheet is a security paper, characterized in that made of a release paper detachable by being adhered by the pressure-sensitive adhesive. The method according to any one of claims 1, 2, 8, and 9, Security paper, characterized in that the release paper is attached to the surface of the first sheet or the second sheet is detachable by adhesive.

Images