JP4334681B2 - Anti-counterfeit thread and anti-counterfeit paper using the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an anti-counterfeit thread and an anti-counterfeit paper using the same. Specifically, the substrate resin film is provided with a roughened portion with an ink whose surface is roughened, and further includes a ferromagnetic material thin film layer deposited on the resin film or the roughened portion. The anti-counterfeit thread and anti-counterfeit paper using the same. Such anti-counterfeit paper can be used for various security media such as gift certificates, gift certificates, certificates, tickets, voting tickets, tickets, and labels.
[0002]
[Prior art]
As a measure for preventing counterfeiting of various security media, there is a method of embedding various threads on paper. Such anti-counterfeiting means using threads is provided at the stage of paper manufacture, so it is difficult to forge by methods such as color copying, scanner capture, and plate-making printing. However, there are cases where counterfeit paper incorporating a counterfeit thread imitating a genuine thread is available, and a simple magnetic thread or glitter thread alone may not be sufficient for authenticity determination.
[0003]
On the other hand, a structure in which a general magnetic recording material is combined with a thread is not an advanced anti-counterfeiting structure because it is easy to falsify magnetic recording information.
For this reason, as a data recording carrier having a higher level of anti-counterfeit structure, as a structure in which a roughened portion and a magnetic film are combined, in Japanese Patent Laid-Open No. 10-64051, a magnetically patterned magnetic plate or the like is proposed.
Therefore, the present invention intends to further improve the anti-counterfeit effect by further improving the magnetic plate and applying it to the anti-counterfeit thread and the anti-counterfeit paper using the same.
[0004]
[Means for Solving the Problems]
The first of the gist of the present invention for solving the above problems is a thread for embedding on a forgery-preventing paper for use, and a roughened portion by roughening ink is formed on a substrate made of a resin film. A ferromagnetic material thin film layer provided on the resin film base material and the roughened portion so as to follow the surface by vapor phase growth , and the squareness ratio on the base material is The anti-counterfeit thread is 0.8 to 1.0 and has a squareness ratio of 0.5 or less on the textured portion. Such a forgery prevention thread is difficult to forge and tamper. Such a thread for preventing forgery can be configured such that a portion having a roughened portion and a portion not having a roughened portion are combined so as to give a constant read signal, and the ferromagnetic thin film layer, the roughened portion and the substrate A light reflecting layer may be provided between the two. Further, if an adhesive layer is provided on the surface opposite to the surface on which the roughened portion of the thread is formed or on the ferromagnetic material thin film layer, the adhesion of the anti-counterfeit paper to the base paper can be strengthened. .
[0005]
A second aspect of the present invention for solving the above-described problem is a forgery prevention paper provided by embedding the above-described anti-counterfeit thread on a base paper, wherein the base paper intermittently disposes the thread. An anti-counterfeit paper comprising an exposed exposed portion and a covering portion that intermittently covers the thread between the exposed portions. Because of such anti-counterfeit paper, it is difficult to forge and tamper.
Such an anti-counterfeit paper may be provided with a plurality of rows of exposed portions and cover portions, and a plurality of anti-counterfeit threads incorporated therein. By doing so, counterfeiting and tampering become more difficult.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
The present invention relates to a forgery prevention thread in which a roughened portion is provided on a substrate made of a resin film, and a ferromagnetic material thin film is formed on the surface thereof by a vapor phase method such as sputtering, and to a forgery prevention paper using the same.
Since the ferromagnetic material thin film used in the present invention is basically a thin film formed by vapor deposition such as vapor deposition or sputtering, when detecting the magnetic properties of the thin film, the surface roughness of the substrate on which the thin film is formed is determined. Unless the thickness is about several μm or less, the magnetic properties inherent to the magnetic material do not appear. For example, a PET film having a flat surface area with a surface roughness of about 0.01 to 0.1 μm is required as the base material. At this time, the surface roughness of the base material is several μm or more and becomes porous. If a magnetic material is formed on the non-flat region, the original magnetic characteristics of the formed magnetic material do not appear, and the magnetic detection signal becomes weak or disappears. The present invention utilizes such a phenomenon for a forgery prevention thread.
[0007]
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view showing an embodiment of the thread for preventing forgery of the present invention. In the case of this embodiment, the anti-counterfeit thread 10 has a roughened portion 13 formed of a roughened ink on a base material 11 made of a resin film, and is strong on the surface of the resin film and the surface of the roughened portion. A magnetic material thin film layer 15 is provided so as to follow the roughened portion 13. As described above, the roughened portion 13 portion gives a magnetic characteristic of 0.5 or less with a small squareness ratio by the magnetic head, and the smoothness portion without the roughening ink has a large squareness ratio of 0.8 to 1.0. Given the magnetic properties of Although the surface of the roughened portion 13 is required to be a rough surface, the thickness Δh of the roughened portion from the substrate surface itself is not an element that significantly affects the magnetic properties. In a preferred embodiment of the present invention, as will be described later, the roughening unit 13 has a configuration in which a portion is present and a portion that is not present, and the unique pattern configuration gives unique identification information to the read magnetic characteristics. There is.
[0008]
An adhesive layer 16a is provided on the surface of the base material 11 opposite to the surface on which the roughened portion 13 is formed (hereinafter also referred to as "back surface"), and the upper surface (hereinafter referred to as "surface") of the ferromagnetic material thin film layer 14 is provided. .) Can also be provided with an adhesive layer 16b. These adhesive layers have the effect of increasing the adhesive strength with the paper when the thread is incorporated into the anti-counterfeit paper.
[0009]
Hereinafter, each component of the anti-counterfeit thread will be described in more detail.
As the substrate 11, a water-resistant and heat-resistant resin film can be used. Generally, a polyethylene terephthalate (PET) resin film and other polyester resin films, polyamide resin films, polyimide resin films, polycarbonate resin films are used. , Polystyrene resin film, polypropylene resin film, polysulfone resin film, polyphenylene sulfide resin film, cellulose resin film, and the like. The recommended thickness is about 1 to 300 μm, preferably 5 to 50 μm.
[0010]
The surface-roughening ink is a non-magnetic metal, carbon, ceramic, oxide such as alumina, silica, titania, etc., calcium carbonate, resin powder, etc. Resin, etc.) and dissolved in a solvent to form an ink. The ink does not need to be colored because it is intended to roughen or rough the substrate surface.
In the present invention, it is preferable that the roughness of the surface of the roughened portion by the roughening ink is sufficiently larger than the thickness of the ferromagnetic material thin film layer 15. The roughened portions by the roughening ink may be scattered three-dimensionally, or may be formed so that certain uneven stripes are arranged in a certain direction. However, even if it is a stripe shape, it is a rough pitch that is provided by printing, so that an effect like a diffraction grating does not occur.
Since the thickness Δh of the roughened portion by the roughening ink is 1 μm to several tens of μm, it can be made sufficiently thicker than the thickness of the ferromagnetic material thin film layer 15. However, if the thickness of the ink layer is increased, cracks, cracks in the magnetic film, etc. are generated, and the influence on measurement is considered to be about 50 μm. Such roughening ink can be printed by intaglio printing such as silk screen printing or gravure printing.
[0011]
Next, the ferromagnetic material thin film layer 15 may be crystalline or amorphous, and is made of one or a combination of two or more of iron (Fe), cobalt (Co), and nickel (Ni). Mainly composed of magnetic material, boron (B), carbon (C), magnesium (Mg), aluminum (Al), silicon (Si), phosphorus (P), sulfur (S), titanium (Ti) , Vanadium (V), chromium (Cr), manganese (Mn), copper (Cu), zinc (Zn), yttrium (Y), zirconium (Zr), niobium (Nb), molybdenum (Mo), palladium (Pd) , Silver (Ag), indium (In), tin (Sn), tantalum (Ta), tungsten (W), iridium (Ir), platinum (Pt), gold (Au), lead (Pb) Seed metal or And a additive metal elements.
[0012]
Ferromagnetic material thin film layers are formed by vacuum processes such as sputtering, vapor deposition, and ion plating using an alloy composed of iron, cobalt, nickel as the main component and a material composed of additive elements or a mixture thereof as a target material or vapor deposition source. It is formed by means using The ferromagnetic material is represented by a cobalt Co-zirconium Zr system or iron Fe-silicon Si system.
The thickness of the ferromagnetic material thin film layer is suitably 500 to 5000 mm. The reason why the lower limit of the layer is 500 mm or less is that the thickness of the magnetic layer is reduced, so that the saturation magnetic flux decreases as the absolute amount of the magnetic body decreases, and the magnetic signal becomes smaller. This is because the thickness of the magnetic material needs to be 500 mm or more in order to obtain a magnetic signal to be used. The reason why the upper limit is 5000 mm is to make a clear distinction from a magnetic film produced by another method (usually 1 μm or more in thickness), and it is preferable to avoid making it thicker than this. is there. Further, when the thickness is larger than this, the thread characteristics are deteriorated due to curling or the like due to the internal stress of the film, and wrinkles or cracks may occur.
In view of the productivity of the ferromagnetic thin film layer and the stability of the magnetic signal, the preferred thickness of the layer is in the range of 1500 to 3000 mm (0.15 to 0.3 μm).
[0013]
Such a ferromagnetic material thin film layer exhibits unique characteristics in Hc (coercivity) and Bm (saturation magnetic flux density), and from the magnetic characteristics, the magnetic field strength applied normally and the magnetic flux density of the magnetic material magnetized by the magnetic field. Has a non-linear BH characteristic (hysteresis curve), and can be clearly distinguished from general magnetic materials.
The ferromagnetic material thin film layer used in the present invention preferably has Hc (coercive force) of 0.5 to 50 Oe and Rsq (square ratio) of 0.75 to 1.0.
FIG. 2 shows a hysteresis curve of the ferromagnetic thin film layer. On the substrate surface that is smooth and has no irregularities, the ferromagnetic thin film layer 15 has a small coercive force Hc as shown in FIG. In addition, a BH hysteresis curve having a high squareness ratio (0.8 to 1.0) is obtained. On the other hand, on the uneven substrate surface, as shown in FIG. 2 (B), the saturation magnetic flux density Bm decreases, and a hysteresis characteristic with a low squareness ratio (0.5 or less) is obtained.
The squareness ratio Rsq is
Rsq = Br (residual magnetic flux density) / Bm (saturated magnetic flux density)
It is represented by
[0014]
A nonmagnetic metal film can be provided as the light reflecting layer 14 between the ferromagnetic material thin film layer 15 and the roughened portion 13 or the substrate 11. In this case, the glossy color of the non-magnetic metal can be observed as reflected light from the outside without being affected by the color of the ferromagnetic thin film. No anti-counterfeiting thread is given. Such a light reflection layer is made of a reflective non-magnetic metal material such as gold, silver, aluminum, chromium, nickel, or the like. In general, aluminum is preferably employed due to cost and technical problems, and the thickness can be formed to a thickness of about 100 to 2000 mm, but preferably about 200 to 1000 mm.
[0015]
FIG. 3 is a diagram illustrating an example of a roughening portion of a forgery prevention thread. FIG. 6 shows a pattern of a configuration combined so as to give a specific magnetic characteristic as described above, where the roughening portion 13 and the “absent” portion 13n of the roughening portion are the scanning direction of the magnetic head or the length of the thread. Different read magnetic properties are given to the direction.
In FIG. 3A, the “present” portion 13 and the “absent” portion 13n of the roughened portion are alternately and repeatedly formed in the length direction of the thread. As described above, the magnetic signal is weakened or disappears in the portion having the roughened portion. Therefore, if the “present” portion of the roughened portion is “0” and the “not present” portion is “1”, 0, A repetitive signal of 1, 0, 1 is obtained.
In FIG. 3B, the “present” portion 13 and the “absent” portion 13n of the roughened portion are repeatedly formed in the order of two, one in the length direction of the thread. If the “present” portion of the roughening portion is “0” and the “not present” portion is “1”, a repetitive signal of 0, 0, 1, 0, 0, 1 is obtained.
[0016]
The adhesive layer 16a is for increasing the adhesive strength with the paper when the anti-counterfeit thread 10 is formed on the paper, and is composed of a water-soluble binder having a heat melting temperature of 60 to 80 ° C. An agent layer can be provided on the back surface of the substrate 11. Alternatively, the adhesive layer 16b may be provided on the upper surface (surface) of the ferromagnetic material layer. Specifically, an adhesive made of starch, casein, carboxymethyl cellulose, carboxyethyl cellulose, or the like that is water-soluble can be employed.
Alternatively, the adhesive layer may be a hot melt adhesive having a heat melting temperature of 60 to 80 ° C. The coating thickness may be within a few μm.
[0017]
Next, the forgery prevention paper of the present invention will be described.
Anti-counterfeiting paper that is threaded so as to be exposed in the window is, for example, paper of a type in which glittering threads or magnetic threads are embedded in the base paper, and the base paper is glittering threads. There are known ones that include an exposed portion (window) that intermittently exposes and a covering portion that intermittently covers the glittering thread between the exposed portions.
The anti-counterfeit paper having this configuration is provided with a small convex part having the same width as or wider than the thread on one paper net part of the multi-cylinder paper machine, and the thread is placed on the convex part. It can be manufactured by supplying a stock solution. That is, in this way, the covering portion is formed because the thread is sandwiched by the stock liquid at the position where there is no convex portion, and the exposed portion is exposed from the lower surface side of the stock liquid at the convex portion position. It is formed.
[0018]
In the threaded paper with the window as described above, the glittering thread and the like are intermittently exposed at the exposed portion, so that even when copied, the metal color is not reproduced, so that forgery can be prevented. In addition, it is not necessary to check the end face of the paper to see if it is a counterfeit product, and it is possible to prevent the glittering thread or the like from being peeled off from the base paper.
[0019]
FIG. 4 is a diagram showing a first embodiment of the forgery prevention sheet of the present invention. 4A is a plan view thereof, and FIG. 4B is a cross-sectional view taken along line AA in FIG. 4A. As shown in FIG. 4, in the first embodiment of the anti-counterfeit paper 20 of the present invention, a single thread 10 is drawn into the base paper 21, and the thread 10 is intermittently inserted into the base paper 21. A plurality of exposed portions 26 that are exposed to each other and a covering portion 27 that intermittently covers the thread 10 between the exposed portions. The exposed portion 26 may be the same width as the thread, but by making the both sides of the thread 10 become the watermark portion 28 by making it wider than that, the tolerance (blurring) of the thread generated during paper making is absorbed by the watermark portion. be able to.
[0020]
However, the base paper 21 is preferably configured so that both end portions of the thread 10 are covered portions 17 with respect to any thread. This is because if the end of the thread is exposed, the thread peels off. The width of the thread to be used is not particularly limited depending on the purpose of use of the paper, but a width of about 0.2 mm to 5 mm is usually used.
[0021]
FIG. 5 is a diagram showing a second embodiment of the forgery prevention sheet of the present invention. 5A is a plan view thereof, and FIG. 5B is a cross-sectional view taken along line AA in FIG. 5A. As shown in FIG. 5, in the second embodiment of the forgery-preventing paper of the present invention, a plurality of threads 10 are formed on the base paper 21, and the base paper 21 exposes the threads 10 intermittently. A plurality of exposed portions 26 and a covering portion 27 that intermittently covers the thread 10 between the exposed portions are the same as in the first embodiment.
The second embodiment is characterized in that the exposed portion 26 and the covering portion 27 appear in the same state at the same position from the end of the sheet at the thread end with respect to a plurality of threads. That is, both the thread 10a and the thread 10b are exposed at the position x from the paper edge, and both the thread 10a and the thread 10b at the position y from the paper edge. It is a covering part.
[0022]
However, the base paper 21 is preferably configured as a covering portion 27 for both threads at both ends of the thread 10. This is because if the end of the thread is exposed, the thread peels off. The width of the thread to be used is not particularly limited depending on the purpose of use of the paper, but a width of about 0.2 mm to 5 mm is usually used. The widths of the plurality of threads do not need to be the same width, and it is also arbitrary to change the color tone, optical characteristics, color development characteristics, magnetic characteristics, and the like.
As described above, by introducing two or more threads into the security medium, the method of simply pasting a forged thread increases the forgery cost and the process becomes complicated, so that the forgery suppression effect increases. .
[0023]
FIG. 6 is a diagram showing a third embodiment of the anti-counterfeit paper according to the present invention. 6A is a plan view thereof, and FIG. 6B is a cross-sectional view taken along line AA of FIG. 6A. As shown in FIG. 6, the third embodiment of the anti-counterfeit paper according to the present invention has a configuration in which a plurality of threads 10 are formed on the base paper 21, and the base paper 21 exposes the threads 10 intermittently. A plurality of exposed portions 26 and a covering portion 27 that intermittently covers the thread 10 between the exposed portions are the same as in the first embodiment.
In the third embodiment, the exposed portion 26 and the covering portion 27 are different between at least two adjacent threads of the plurality of threads at the same position from the end of the sheet at the thread end. There are features that appear. That is, at the position x from the end of the paper, it is an exposed portion for the thread 10a and a covering portion for the thread 10b. However, the base paper 21 is preferably the same as the first embodiment in that both end portions of the thread 10 are configured as the covering portions 27, and the same applies to the following embodiments.
In this way, when the exposed portion is provided in a so-called staggered pattern, it is possible to reduce the rise of the thread portion when the sheets are stacked, facilitating printing, and preventing roll-up during handling of the take-up paper. can do.
[0024]
Next, the manufacturing state of the anti-counterfeit paper of the present invention will be described.
FIG. 7 is a diagram illustrating a state in which a forgery-preventing sheet with threads is drawn. 7A is a cross section parallel to the thread, FIG. 7B is a cross section taken along line CC in FIG. 7A and perpendicular to the thread, and FIG. 7C is a cross section taken along line DD. Is shown. As shown in the figure, this threaded anti-counterfeit paper 20 is provided with ridges 29a of the sash net portion having the same width as or wider than the thread 10 at appropriate intervals on the slat mesh portion 29 of the paper machine. It can be manufactured by supplying the stock liquid 22a in a state where the thread 10 is placed on 29a. In other words, in this way, the thread 10 is sandwiched by the paper material liquid 22a at the position between the convex portions 29a and 29a, so that the covering portion 27 is formed, and at the position of the convex portion 29a, the thread 10 is the bottom surface. Therefore, when the paper is peeled from the paper mesh of the paper machine, the thread appears on the surface and the exposed portion 26 is formed.
[0025]
When the projecting portion 29a of the perforated net portion has the same width as the thread 10 as shown in FIG. 7D, the watermark portion 28 does not enter on both sides of the thread 10. In addition, when the width is set so as to straddle the thread, a watermark portion is inserted to enhance the decorative effect, and the blurring of the thread can be absorbed as described above.
When the watermark pattern 25 is provided around the thread, a pattern-like convex portion may be formed on the perforated net portion in the same manner as the convex portion 29a.
[0026]
【Example】
Embodiments of the present invention will be described below with reference to the drawings.
(Example)
<Fabrication prevention thread>
As a base film 11 for anti-counterfeiting thread, a smooth and transparent polyethylene terephthalate film (“Lumirror S-28” manufactured by Toray Industries, Inc.) [thickness: 16 μm] is coated with a surface-roughening ink having the following composition and a width of 2 mm The roughened portion was printed by gravure printing and dried. The thickness Δh of the roughened portion after drying was set to 7 μm.
When the roughened portion is cut into threads, as shown in FIG. 3A, the “absent” portion 13n of the roughened portion and the “present” portion of the roughened portion 13 are in the length direction of the thread. It was printed so that it might be repeated.
[Ink composition]
Binder; Vinyl chloride / urethane resin 100 parts by weight Granules: Microsilica (particle size 5.5 μm) 10 parts by weight
Subsequently, a vapor deposition film made of Al is formed to a thickness of 300 mm on the roughened portion and on the surface of the base material without the roughened portion, and similarly, the ferromagnetic material thin film layer 15 made of iron Fe-silicon Si is used. Was deposited by sputtering to a thickness of 0.2 μm.
In addition, after applying a vinyl chloride-based adhesive to a thickness of 1 μm on the back surface of the base film, it is slitted to a width of 2 mm so as to be orthogonal to the stripe of the roughened portion using a slitter machine. Completed anti-counterfeiting thread.
[0028]
As a result of measuring the magnetic properties of this thread, the squareness ratio in the smooth portion 13n having no roughening portion due to the roughening ink was 0.9. Moreover, the squareness ratio in the roughening part 13 was 0.2. The measurement was performed using a VSM (sample vibration magnetometer) with a DC magnetic field, but the same result was obtained with a BH analyzer using an AC magnetic field.
[0029]
<Making of anti-counterfeit paper>
As shown in FIG. 4, a paper making net in which the exposed portion 26 is repeated with a pitch of 10 mm × width of 10 mm and the covering portion 27 with a pitch of 10 mm so that the two anti-counterfeit threads 10 manufactured above appear on the anti-counterfeit paper as shown in FIG. Using a pattern paper machine, paper was made on high-quality paper of 90 kg / sixth edition. In addition, the height of the convex part of the netting part was adjusted so that the upper part of the covering part 27 was 35 g / m ² and the lower part of the covering part was 69 g / m ² .
When the anti-counterfeit paper 20 thus completed is read with a magnetic head, the “existing” portion of the roughening portion is “0” and the “non-existing” portion of the roughening portion is in the length direction of the thread. As “1”, a repetitive signal of 0, 1, 0, 1 was obtained.
[0030]
【The invention's effect】
The anti-counterfeit thread according to the present invention forms a roughened portion with a roughened ink on a substrate, and follows the surface by vapor phase growth on the roughened portion and on a substrate that is not the roughened portion. Since the ferromagnetic thin film layer is formed , the magnetic thin film layer has a unique magnetic property, that is, the ferromagnetic thin film layer formed on the base material which is not the above-mentioned roughened portion has a high squareness ratio of 0.8 to 1 when magnetized. It shows 2.0, formed on the roughened portion ferromagnetic thin layer can give a characteristic that exhibits a low squareness ratio of 0.5 or less when it is magnetized, ordinary magnetic thread and bright It has an anti-counterfeit effect that cannot be obtained with sex threads. In addition, since the anti-counterfeit paper of the present invention has such anti-counterfeit threads incorporated in the base paper, it is difficult to duplicate, and the reliability of gift certificates and other securities can be improved.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an embodiment of an anti-counterfeit thread according to the present invention.
FIG. 2 shows a hysteresis curve of a ferromagnetic thin film layer.
FIG. 3 is a diagram illustrating an example of a roughening portion of a forgery prevention thread.
FIG. 4 is a diagram illustrating a first embodiment of a forgery prevention sheet according to the invention.
FIG. 5 is a diagram showing a second embodiment of the forgery prevention sheet of the invention.
FIG. 6 is a diagram showing a third embodiment of the forgery prevention sheet of the invention.
FIG. 7 is a diagram illustrating a state in which a forgery-preventing paper with a thread is formed.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Anti-counterfeit thread 11 Base material 13 Roughening part 14 Light reflection layer 15 Ferromagnetic material thin film layers 16a and 16b Adhesive layer 20 Anti-counterfeit paper 21 Base paper 22a Paper material liquid 26 Output part 27 Cover part 28 Watermark part 29 Perforated net part 29a Convex part of perforated net part

Claims (7)

A thread for use crowded paper making the anti-falsification paper, the roughened portion is provided by roughening the ink on a substrate made of a resin film, the gas on the resin film substrate and roughened portion on further comprising a ferromagnetic material thin film layer is deposited so as to follow to the surface by phase growth, and squareness ratio on the substrate a 0.8 to 1.0, the roughened portion on An anti-counterfeit thread having a squareness ratio of 0.5 or less.     2. The forgery prevention thread according to claim 1, wherein a portion having the roughening portion and a portion not having the roughening portion are combined so as to give a constant read signal.    The anti-counterfeit thread according to claim 1 or 2, further comprising a light reflecting layer between the ferromagnetic thin film layer, the roughened portion, and the substrate.    The anti-counterfeit thread according to claim 1, wherein an adhesive layer is provided on a surface of the base material opposite to the surface on which the roughened portion is formed.    The anti-counterfeit thread according to claim 1, wherein an adhesive layer is provided on the ferromagnetic material thin film layer.    An anti-counterfeit paper provided by embedding the anti-counterfeit thread according to claim 1 on a base paper, wherein the base paper includes an exposed portion that exposes the thread intermittently and the exposed surface. An anti-counterfeit paper, characterized in that it is provided with a covering portion that intermittently covers the threads.    The anti-counterfeit paper according to claim 6, wherein a plurality of exposed portions and covering portions are provided, and a plurality of anti-counterfeit threads are incorporated.

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