JP5200486B2 - Anti-counterfeit paper and anti-counterfeit printed matter - Google Patents

Description

  The present invention relates to anti-counterfeit paper incorporating threads (also referred to as strips, filaments, filaments, safety strips, etc.) suitably used in fields where anti-counterfeiting is desired, and securities using the same. The present invention relates to anti-counterfeit printed matter such as money and banknotes.

  More specifically, in the thread-made paper in which the thread with the anti-counterfeit layer provided on the surface is made between the paper layers, by changing the opacity of the paper layer to be combined, the paper surface (front side) and The present invention relates to a thread imprinting paper characterized in that when the back surface is observed, the anti-counterfeit layer provided on the thread can be visually recognized on the front and back sides, and an anti-counterfeit printed matter using the same. In the present invention, a micro character and a micro image (hereinafter referred to simply as “micro character” in the present invention) will be described as typical examples of the anti-counterfeit layer.

  “Threaded paper” in which a thread called a thread is formed in a paper layer is generally well known as a form of anti-counterfeit paper. As is well known, this thread prevents forgery such as hologram layer, metal deposition layer, magnetic layer, micro character layer, micro image layer, thermochromic layer, ultraviolet fluorescent color developing layer, interference color developing layer on the surface of the base film. A layer is provided and manufactured by micro slitting. Since the threaded paper requires a very advanced technique for manufacturing, it has a great effect on prevention of counterfeiting and is widely used for banknotes in various countries as is well known.

  The threaded paper is roughly classified into two types. One of them is that the thread is engraved inside the paper and is not exposed on the paper surface. The other is called “paper with open window thread” in which a part of the thread is intermittently exposed on the paper surface.

  In the former method, the nozzle is inserted into the flow of the stock in the slice part of the long net paper machine, the thread is fed while water is passed through the nozzle, and the thread is formed in the paper net and formed in the paper layer. Install the thread insertion device into the stock flowing out from the flow box of the long web paper machine (for example, see Patent Document 1), and keep the thread in a non-contact state with the air flow. Threading method (for example, see Patent Document 2), using a circular paper machine having two or more layers, and using two or more layers of paper pipes with unevenness on the inner wall Has been proposed (for example, refer to Patent Document 3).

  The latter method of making “paper with window empty thread” is to use a mesh processed into an uneven shape for the upper net of a circular paper machine, and insert the thread while making contact with the uneven portion of the net surface to open the window When a multi-layered laminated paper is produced using a method of making a thread into a paper (see, for example, Patent Document 4) or a circular paper machine, a paper layer in which a window opening is formed in the outermost layer is positioned. The other paper layers are combined so that the paper layer that does not form the window empty portion is positioned, and the thread is embedded so that the thread is exposed in the window empty portion when the paper layers are combined ( For example, see Patent Document 5).

  Hereinafter, as a representative example of the thread, a micro character-containing thread in which micro characters are formed as a forgery prevention layer on the surface of the base film will be described. The reason for this is that the effect of the present invention can be maximized in a forgery prevention paper using a thread with micro characters.

  Threads with micro characters are selected by printing micro characters on plastic films using colored inks, threading micro characters directly on plastic films, or using a mask or template in a vacuum evaporation system There are known a method of metallization and a method of demetalizing by corrosion after metallization (see, for example, Patent Document 6). Of these, threads that form micro characters with colored ink and threads that form micro characters by “demetalizing” are frequently used for banknote paper, passport paper, gift certificate paper, and the like.

By the way, when the thickness of the paper is small, it transmits a lot of light, but as the thickness increases, it becomes difficult to transmit the light. Although it depends on the prescription, for example, it is an anti-counterfeit paper used for the body paper of a passport booklet having a basis weight of 90 g / m ² , and the opacity (specified in JIS P8149) often shows a value of 80 to 90%. If the opacity of the paper is about this level, the micro characters can be read from the front and back surfaces of the paper when a thread in which the micro characters are formed on the transparent base film is formed on the paper. However, if the thread is not roughly centered with respect to the thickness direction of the paper, the appearance of the micro characters is not the same when viewed from the front of the paper and when viewed from the back, and is quite different. It will be visible. However, for example, in applications where both front and back sides are used, such as the text sheet of a passport booklet, it is inconvenient if the appearance of the micro characters formed on the thread is not the same on the front side and the back side of each page.

  In addition, forgery prevention paper often employs various forgery prevention techniques in addition to threading. A representative technique is “watermark”. As is well known, (1) a metal or plastic mold is attached to the upper net of a circular net machine or a dandy roll of a long net paper machine. In particular, it is manufactured using a net that is painted with a resin or the like, and (3) a net having an uneven pattern on the upper net.

  In the above methods (1) and (2), since the mesh of the mold part is blocked, the passage of the paper stock is suppressed, and even if a paper layer is not formed or formed in this part, it becomes thin. A watermark appears. In the method (3), the watermark pattern is formed as the unevenness of the mesh, but the mesh is not blocked. The watermark pattern appears as a result of differences in fiber accumulation depending on the size of the unevenness of the mesh and the angle of the slope of the mesh.

Watermarked paper is manufactured for both single-layer paper and multi-layer paper. In a multi-layered watermarked paper, in order to maximize the effect of the watermark, the layers are not necessarily combined with the same weight, and an odd number of paper layers may be combined. For example, if a paper sheet with a watermark of 100 g / m ² is manufactured by combining three layers, the front layer and the back layer are each 30 g / m ² , the intermediate layer is 40 g / m ² , and the intermediate layer is watermarked. Things are done. Further, there is a case in which ultraviolet fluorescent coloring fiber is formed on the intermediate layer of the three-layered laminated paper without using a watermark, and a thread with micro characters is formed on the paper. In such a case, the thread is inserted either between the paper layer of the front surface layer and the paper layer of the intermediate layer, or between the paper layer of the back surface layer and the paper layer of the intermediate layer.

If the paper is manufactured with the former configuration, the micro characters formed on the thread are read from the front surface through a 30 g / m ² paper layer and from the back surface through a 70 g / m ² paper layer. Of course, in the 30 g / m ² paper layer and the 70 g / m ² paper layer, the light transmittance is larger in the case of 30 g / m ² , so that when viewed from the front side, it is viewed from the back side. The micro letters will appear clearer. For this reason, as described above, in applications where both front and back sides are used, such as the text of a passport booklet, the back side is required even though the micro characters are required to be seen from both sides. Causes a problem that micro characters are difficult to see.

Prior art documents are shown below.
Japanese Patent Laid-Open No. 51-130309 JP-A-2-169790 Japanese Patent Publication No. 5-40080 U.S. Pat. No. 4,462,866 Japanese Patent No. 2845197 Japanese Patent Publication No. 6-62030

  The present invention is intended to solve such problems of the prior art. When a thread on which a forgery prevention layer (a micro letter is a typical example) is formed on a sheet, the thread is extracted. Providing anti-counterfeit paper and anti-counterfeit printed matter so that the anti-counterfeit layer can be seen in the same way when viewed from the front or back side of the paper even if the inserted position is biased to the front or back side With the goal.

  In the present invention, the fact that the anti-counterfeit layer can be seen in substantially the same manner means that the hue, density, and saturation of the anti-counterfeit layer appear to be the same or almost the same (hereinafter referred to as the present specification). Unless otherwise noted, “same or nearly identical” is referred to as “almost identical”).

The present invention has been made to solve the above-described problems, and the invention according to claim 1 of the present invention is a forgery-preventing paper in which a thread having a forgery-preventing layer formed on the surface is formed between paper layers. A paper layer formed by combining one paper layer or a plurality of paper layers positioned on the front side of the thread, and one paper layer or a plurality of paper layers positioned on the back side of the thread. The paper layer is a forgery-preventing paper characterized in that the opacity is the same.

  The invention according to claim 2 of the present invention is an anti-counterfeit printed matter using the anti-counterfeit paper according to claim 1.

  The anti-counterfeit paper according to the present invention is a forgery-preventing paper in which a thread provided with a forgery-preventing layer is formed between paper layers. By changing the opacity of the paper layer to be combined, the surface of the paper (front When the front and back surfaces are observed, the anti-counterfeit layer provided on the thread can be seen almost the same, so that the thread formed with the anti-counterfeit layer is drawn at a position shifted from the center in the thickness direction of the paper. Even if it is included, the anti-counterfeit layer can be seen in substantially the same way when viewed from the front or back surface of the paper.

  Since the anti-counterfeit paper of the present invention has such features, it is particularly suitable for use in which both front and back sides are used, for example, anti-counterfeit printed matter such as passport booklet text paper, banknotes, gift certificates, identification booklets, etc. it can.

  The embodiment of the present invention will be described in detail with reference to FIGS. 1 to 7, but is not particularly limited thereto.

  FIG. 1 is a perspective view showing an embodiment of a thread for anti-counterfeit paper according to the present invention, FIG. 2 is a side sectional view showing an embodiment of a thread for anti-counterfeit paper according to the present invention, and FIG. FIG. 4 is a side sectional view of the anti-counterfeit paper in which the thread of FIG. 2 is formed on the three-layered laminated paper, and FIG. 4 is the side of the anti-counterfeit paper in which the thread of FIG. FIG. 5 is a side sectional view showing another embodiment of the thread of the anti-counterfeit paper according to the present invention, and FIG. 6 shows another embodiment of the thread of the anti-counterfeit paper according to the present invention. FIG. 7 is a side sectional view, and FIG. 7 is a plan view showing one embodiment of a forgery-preventing printed matter according to the present invention.

  In the thread formed with the micro characters according to the present invention, the micro characters formed on the base film can be used in any form. For example, a form in which a printed layer of micro characters or images is formed on a base film, a form in which a layer of micro characters or images by demetalizing is formed on the base film, a combination thereof, or the like can be given.

  In particular, it is preferable that the thread form capable of maximizing the effects of the present invention is the one filed by the present applicant in PCT / JP2006 / 313855 (International Publication No. WO2007 / 007784A1).

  Specifically, as shown in FIG. 6, one or more metal thin film layers (3) formed in a desired pattern on one surface of the base film (1), and the metal thin film layer (3) A colored resin layer (7) formed in the same pattern as each metal thin film layer (3) and colored thereon is provided on each, and a region where the metal thin film layer (3) is present, and the metal thin film layer (3 ), The contrast between the former and the latter is generated when exposed to light, and the metal thin film layer (3) of the base film (1) and the colored resin. A thread characterized by being able to visually recognize the patterned colored resin layer (7) when observed from the side provided with the layer (7) is preferable.

  Furthermore, on the opposite surface of the base film (1), each of the one or more metal thin film layers (4) formed in a desired pattern, and each of the metal thin film layers (8) on each of them. A thread (20) provided with the colored resin layer (8) formed in the same pattern as the metal thin film layer (4) and colored is also preferable.

  Hereinafter, the present invention will be described in detail with reference to the drawings. First, a thread in which micro characters are formed as a forgery prevention layer will be described as a representative example.

  FIG. 1 is a perspective view of an example of a thread in which micro characters are formed on the surface of FIG. 1 of Japanese Patent Application No. 2006-288840 filed earlier by the present applicant. The thread shown in FIG. 1 has a micro character (2) formed as a forgery prevention layer on a strip-shaped base film (1).

  FIG. 2 is FIG. 2 of Japanese Patent Application No. 2006-288840 filed earlier by the present applicant and shows a cross-sectional view of a thread. The thread (20) is obtained by forming the micro character (2) as a forgery prevention layer on the transparent base film (1), and the micro character is seen from the front surface or the back surface of the thread (20). (2) looks substantially the same.

  FIG. 3 is the same as FIG. 3 of Japanese Patent Application No. 2006-288840 filed earlier by the present applicant, and the anti-counterfeit paper in which the thread (20) of FIG. 2 is formed on a three-layer laminated paper. FIG.

  In FIG. 3, the paper layer (11, 12, 13) composition ratio of the three-layered laminated paper is the same and is 1: 1: 1. In this case, the appearance of the micro characters is different when viewed from the front side and the back side of the paper. That is, when viewed from the front surface, the micro character (2) on the thread (20) is viewed through the single paper layer (11), so that the micro character (2) is clearly visible, but viewed from the back surface. Since the micro character (2) on the thread (20) is viewed through the two paper layers (13, 12), the appearance of the micro character (2) becomes unclear.

  FIG. 4 is the same as FIG. 4 of Japanese Patent Application No. 2006-288840 filed earlier by the present applicant, and the anti-counterfeit paper in which the thread (20) of FIG. 2 is formed on a two-layer laminated paper. FIG.

  In FIG. 4, the paper layer (14, 15) combining ratio of the two-layered laminated paper is the same and is 1: 1. In this case, the micro characters (2) on the thread (20) are viewed through the paper layer (14) or the paper layer (15) having substantially the same thickness when viewed from the front surface and the back surface, respectively. Therefore, the appearance of the micro character (2) is almost the same.

  As shown in FIG. 3, the anti-counterfeit paper according to the present invention is viewed from the surface of the paper when the distance in the thickness direction from the front and back surfaces of the anti-counterfeit paper to the anti-counterfeit layer of the thread is different from each other. However, it is intended to make the appearance of the micro characters almost the same when viewed from the back side.

  Next, the configuration of the threads used in the present invention will be described in detail with typical examples, but it goes without saying that threads other than these configurations can be used in the present invention.

[Example of forming micro characters with colored ink]
This thread is the thread shown in FIG. 2, in which micro characters are formed by printing colored ink as a forgery prevention layer on a transparent base film. Since the base film of this thread is transparent, the micro characters are observed the same regardless of whether the thread is viewed from the front side or the back side.

[Example of forming demetamicro characters on one side]
This thread is a thread shown in FIG. 2, in which micro characters are formed on a transparent base film by a demetalizing process as a forgery prevention layer. Since the base film of this thread is transparent, the micro characters are observed identically when viewed from either the front side or the back side of the thread.

[Example of micro characters printed on both sides of a white base film]
FIG. 5 is FIG. 2 of Japanese Patent Application No. 2006-293772 filed earlier by the present applicant, and shows a cross-sectional view of the thread (20). In this thread (20), colored printing layers (31, 32) are formed on both front and back surfaces of an opaque white base film (1).

[Example of double-sided demetamicro character thread based on transparent film]
FIG. 6 is FIG. 5 of PCT / JP2006 / 313855 filed earlier by the present applicant. This thread is a micro character by demetalizing processing as an anti-counterfeit layer on both sides of the transparent base film (2). Is formed. In this example, a colored resin print layer (7, 8) is not formed on the entire surface of the substrate, but a partially non-colored resin print layer (9) is provided. Since the base film of this thread is transparent, the micro characters are observed in the same tone when viewed from the front side or the back side of the thread.

  Next, means for forming micro characters will be described. Printing and demetalizing processes are known as representative examples of micro character forming means.

Ink used for forming micro characters by printing method is not only binder resin, color pigment, white pigment, but also curing agent, fluidity improver, antiblocking agent, antistatic agent, plasticizer, surfactant It prepares by mix | blending various adjuvants, such as these as needed. As the color pigment, a known organic or inorganic color pigment is used. Organic pigments such as phthalocyanine, azo, and anthraquinone, inorganic pigments such as carbon black, titanium oxide, iron oxide, iron hydroxide, chromium oxide, aluminum, and other white powders The above pigments can be used.

  In the case of forming micro characters by demetalizing, a known method can be used (refer to Japanese Patent Publication No. 2005-13585). For example, after printing micro characters with a resin ink having alkali resistance and acid resistance on a base film vacuum-deposited with metal aluminum to form a resin print layer, a vapor deposition layer of aluminum other than the printing portion with an alkaline aqueous solution or an acidic aqueous solution The method of washing away is used. Moreover, the method of apply | coating a photoresist to the vapor deposition layer surface, exposing a micro character pattern, hardening the resist, and performing the etching process is also used. By these treatments, a vapor deposition layer such as aluminum is left in the printing portion or the cured resist portion, and the base film is exposed at places other than the printing portion or other than the cured resist portion. Examples of various modifications of the demetalizing process include a method proposed by the present applicant in PCT / JP2006 / 313855.

  The metal used for the vapor deposition layer is typically aluminum, but in addition to this, a simple substance or an alloy of metal such as tin, zinc, iron, nickel, chromium and cobalt can be used. By forming at least a part of the micro character string as a deposited film of a magnetic material such as nickel-cobalt, forgery prevention means based on magnetic information can be obtained. The thickness of the metal vapor deposition layer is usually 10 to 100 nm.

Hereinafter, the thread manufacturing method according to the present invention will be described in more detail. In the following description, g / m ² , mass%, and parts by mass all represent dry conversion values.

  In the present invention, the base film is a semi-synthetic or synthetic resin film such as cellophane, polypropylene, polyester, polybutylene terephthalate, polyacetal, polyphenylene ether, liquid crystal polymer, polyvinyl chloride, polyamide, polycarbonate, polyethyl methacrylate, or polystyrene. It can be used in the form of a single layer or a laminate. In the present invention, as a representative example of the base film, a polyester film having a large physical strength and being chemically stable can be suitably used.

  The base film is preferably not melted or softened in the drying zone of the paper machine and is not tacky at 90 to 110 ° C. If the thickness of the base film is too thin, various processing becomes difficult, and if it is too thick, when the thread is formed between the paper layers, the thickness partially increases and causes various problems. It is preferable to do.

  Base film can be any of achromatic and transparent film, chromatic and transparent film, achromatic and translucent film, chromatic and translucent film, achromatic and opaque film, chromatic and opaque film Can also be used.

  Next, micro characters are formed on the base film by a printing method or a demetalizing method. If necessary, apply an adhesive to one or both sides of the base film. As the adhesive, an adhesive that has the ability to soften or melt with a dryer of a paper machine and firmly adhere to the paper is used.

Specifically, adhesives such as polyvinyl acetate resin, polyvinyl chloride resin, polyester resin, polyacrylate resin, ethylene-vinyl acetate copolymer resin, and polyvinyl alcohol resin are used as water or solvent. It can be formed by coating on the surface of the substrate using a coating machine such as a roll coater or a gravure coater.

The coating amount of the adhesive is usually 0.1 to 10 g / m ² . If necessary, an anti-blocking agent, a lubricant, a colorant, an ultraviolet fluorescent color former and the like may be added to the adhesive. If it is necessary to determine the front and back of the thread, use a base film that absorbs ultraviolet rays as the base film, add an ultraviolet fluorescent color former to the adhesive, and apply this adhesive only to one side. And the front and back of the thread are determined based on the presence or absence of light emission by ultraviolet irradiation.

  Subsequently, the thread | sled of this invention can be manufactured by slitting a base film with a predetermined width | variety according to a conventional method using a micro slitter apparatus. The width of the thread is usually 0.5 to 10 mm. The micro characters on the thread are formed so that one or more rows of regular characters and regular patterns can be visually recognized.

  Next, an example of the manufacturing method of the forgery prevention paper of this invention is demonstrated.

  First, paper pulp such as softwood bleached kraft pulp (NBKP), hardwood bleached kraft pulp (LBKP), softwood bleached sulfite pulp (NBSP), thermomechanical pulp (TMP), etc., and beaters and disc refiners are used. This is beating treatment, and it is made of white clay, kaolin, diatomaceous earth, white carbon (amorphous synthetic silica), resin filler such as urea resin, various fillers such as talc, calcium sulfate, calcium carbonate, titanium dioxide, aluminum hydroxide, A paper material is prepared by appropriately using a paper strength enhancer, a sizing agent, a yield improver, an antifoaming agent, a coloring dye, a coloring pigment, a fluorescent whitening agent, a fixing agent, and the like.

  The anti-counterfeit paper of the present invention is manufactured using a conventionally known multi-layer stitching method. For example, a combination of a plurality of long net paper machines and a combination of a plurality of circular paper machines. As a method for inserting the thread between the paper layers, a conventionally known method can be adopted. For example, a method of inserting a thread into a paper layer formed on a paper net by inserting a nozzle into the flow of the stock in the slice portion of the long paper machine, feeding the thread while flowing water through the nozzle (for example, (See Patent Document 1 above), a method of inserting a thread into a stock flowing out of a flow box of a long paper machine, and making a thread while making the thread and the stock non-contact with an air flow (for example, , See Patent Document 2) Using a circular paper machine having two or more layers, and sending two or more layers, a thread is sent between the paper layers using a feed pipe with an uneven inner wall. A method of making threads between paper layers (for example, see Patent Document 3) can be employed. Of course, the anti-counterfeit paper of the present invention may be manufactured by employing other methods.

  In the present invention, by changing the opacity of the paper layers to be combined, the anti-counterfeit layer provided on the thread can be seen almost the same when the front surface (front surface) and the back surface of the paper are observed. It is necessary. For example, when three layers of paper layers having the same basis weight are combined, a thread is inserted between the first paper layer and the second paper layer, or the second paper layer and the third layer. Either between the paper layers. In the former case, the opacity of the first paper layer must match the opacity when the second and third paper layers are combined, and the paper material forming the first layer The paper materials forming the second layer and the third layer are prepared by changing them and guided to the paper making head. In the latter case, the opacity of the third paper layer needs to match the opacity when the first and second paper layers are combined, and the paper material forming the third layer The paper materials forming the first layer and the second layer are prepared by changing them and guided to the paper making head.

  As a means for changing the opacity of the paper layers to be combined, it is generally possible to increase the amount of filler added to the paper material for forming the paper layer. At this time, it is preferable to employ a filler having a high refractive index, which has a large effect of increasing opacity when compared with the same addition amount. For these reasons, fillers such as titanium dioxide are preferably used. Of the titanium dioxides, rutile type titanium dioxide is most effective because of its high refractive index.

In the present invention, a polyacrylamide resin, starch, polyvinyl alcohol, or the like may be applied to the paper surface using a size press device or the like during papermaking. If necessary, a machine calendar process or a super calendar process is performed to improve the surface smoothness as appropriate. The basis weight of the paper is usually 50 to 150 g / m ² .

  Below, based on an Example, this invention is demonstrated in detail.

<Example of thread production>
[Production Example 1: Thread with micro characters by printing method]
As a base film, a roll of a transparent polyester film having a thickness of 12 μm [manufactured by Toray Industries, Inc., Lumirror (trade name)] was prepared. Micro characters were printed on one side of the base film using black ink. This micro character has a repeating pattern of a normal character of “SECURITY” and a reverse character (appears as a normal character of “SECURITY” when the film is turned over). The size of a micro character is 2.5 points (the number of points means an American point number, 1 point is about 0.35 mm), the distance between characters is 0.3 mm, and the distance between character strings is 0 8 mm. On the back surface of the film, an ethylene-vinyl acetate heat-sensitive adhesive was applied to a thickness of 2 μm to form an adhesive layer. A 2.4 mm wide thread was then produced using a micro slitter.

[Production Example 2: Double-sided micro character thread by demetalizing]
As a base film, a roll of a transparent polyester film having a thickness of 12 μm [manufactured by Toray Industries, Inc., Lumirror (trade name)] was prepared. According to a conventional method using a vacuum vapor deposition machine, metal aluminum was deposited on both sides of the base film by 50 nm (nanometers). On both sides, a gravure printing machine was used, and a blue-colored alkali-resistant resin ink [100 parts by mass of acrylic resin for demetalizing processing was blended with 20 parts by mass of the blue dye Oreosol Blue (manufactured by Sumitomo Chemical Co., Ltd.). The resin printing layer (micro character printing layer) colored with [thing] was formed. This micro character has a repeating pattern of a normal character of “★ ABCD” and a reverse character. The size of the micro character was 2.5 points, the distance between the characters was 0.4 mm, and the distance between the character string and the character string was 0.8 mm. The character string was printed with an inclination of 18 degrees with respect to the thread length direction. According to a conventional method, an aluminum hydroxide aqueous solution was used to perform a demetalizing process, followed by washing with water, drying and winding up on a roll. Furthermore, using a gravure coater, an ethylene-vinyl acetate heat-sensitive adhesive was applied to one side with a thickness of 2 μm to form an adhesive layer. A 2.4 mm wide thread was then produced using a micro slitter.

  Examples of anti-counterfeit paper manufacturing will be given below.

<Example 1>
Example of paper production in a three-tank type paper machine This circular paper machine first forms the first paper layer in the first tank, and forms the next paper layer (intermediate layer) in the second tank. The paper layer formed in the tank is combined with the paper layer formed in the third tank, and the paper layer formed in the tanks 1 and 2 is combined.

Preparation of paper stock-1 25 parts by mass of NBKP and 75 parts by mass of LBKP were mixed with 350 ml of freeness C.I. S. F. As a filler, 12 parts by mass of rutile titanium oxide, 0.4 part by mass of an acrylamide-based paper strength enhancer [manufactured by Arakawa Chemical Industry Co., Ltd., Polystron (trade name)], a sizing agent [Arakawa Chemical Industries, Ltd.] Size Pine E (trade name)] 1.0 part by mass and an appropriate amount of a sulfuric acid band were added to prepare a paper stock.

The same stock material as the stock material-1 was prepared except that the prepared filler of the stock material-2 was changed to 15 parts by mass of white clay.

The stock-1 was introduced into the first tank of the three-tank paper machine, and a paper layer having a basis weight of 30 g / m ² was formed. The stock-2 is introduced into the second tank and the third tank, a paper layer (intermediate layer) having a basis weight of 40 g / m ² is formed in the second tank, and a basis weight of 30 g / m in the third tank. An m ² paper layer was formed and each was made. A white watermark consisting of the characters “SECURITY” (36 points) was applied to the paper layer formed in the second tank according to a conventional method. When the paper layer formed in the first tank and the paper layer formed in the second tank were combined, the thread manufactured in Production Example 1 was incorporated according to a conventional method. Thereafter, forgery prevention paper was produced by drying with a multi-cylinder dryer according to a conventional method. A modified starch aqueous solution was applied between the first group of dryers and the second group of dryers with a size press device for the purpose of enhancing paper strength. When the obtained anti-counterfeit paper was observed with reflected light from the front and back surfaces, the appearance of the micro characters was almost the same from either side. In addition, it was peeled at the interface between the paper layer formed in the first tank and the paper layer formed in the second tank of this anti-counterfeit paper, and the opacity of the paper layer formed in the first tank was measured according to JISP8149. .5%. Further, when the opacity of the paper layers made in the second and third tanks was measured, it was almost the same at 78.3%.

<Example 2>
Example of paper production with a two-tank type paper machine This circular paper machine first forms the first paper layer in the first tank, forms the next paper layer in the second tank, and forms it in the first tank. It has a structure in which the paper layers are made together. The stock-1 was introduced into the first tank of the circular paper machine to form a paper layer having a basis weight of 30 g / m ² . The stock-2 was introduced into the second tank, and a paper layer having a basis weight of 70 g / m ² was formed in the second tank, and the paper layers were combined. When the paper layer formed in the first tank and the paper layer formed in the second tank were combined, the thread manufactured in Production Example 2 was incorporated according to a conventional method. Thereafter, forgery prevention paper was produced by drying with a multi-cylinder dryer according to a conventional method. A polyvinyl alcohol aqueous solution was applied between the first group of dryers and the second group of dryers with a size press to increase paper strength. When the obtained anti-counterfeit paper was observed with reflected light from the front surface and the back surface, the appearance of the micro characters could be visually recognized from both surfaces with almost the same tone. When the paper layer formed in the first tank and the paper layer formed in the second tank were peeled at the interface of the first tank and the opacity of the paper layer formed in the first tank was measured according to JISP8149, 79 was obtained. 0.0%. Further, when the opacity of the paper layer formed in the second tank was measured, it was almost the same at 78.8%.

<Example 3>
[Manufacture of anti-counterfeit printed matter]
As shown in FIG. 7, the anti-counterfeit paper of Example 2 was used to print a printing part (P) such as a design of a gift certificate to produce a forgery-preventing printed matter (200).

  When the anti-counterfeit printed matter (200) was observed with reflected light from the front surface and the back surface, the appearance of the micro characters on the engraved thread (20) was visually recognized with almost the same tone.

It is a perspective view which shows one Example of the thread | thread of the forgery prevention paper which concerns on this invention. It is a sectional side view which shows one Example of the thread | yarn of the forgery prevention paper which concerns on this invention. FIG. 3 is a side sectional view of an anti-counterfeit paper in which the thread of FIG. 2 is formed on a three-layer laminated paper. FIG. 3 is a side sectional view of an anti-counterfeit paper in which the thread of FIG. 2 is formed on a two-layer laminated paper. It is a sectional side view which shows the other Example of the thread | thread of the forgery prevention paper which concerns on this invention. FIG. 6 is a side cross-sectional view showing still another embodiment of a thread for forgery prevention paper according to the present invention. It is a top view which shows one Example of the forgery prevention printed matter which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Base film 2 ... Micro character 20 ... Thread 3 ... Metal thin film layer 4 ... Metal thin film layer 7 ... Colored resin layer 8 ... Colored resin layer 9 ... Uncolored resin layer 11 ... Paper layer 12 ... Paper layer 13 ... Paper layer 14 ... Paper layer 15 ... Paper layer 31 ... Colored printing layer 32 ... Colored printing layer 200 ... Anti-counterfeit printed matter P ... Printing section for gift certificate designs, etc.

Claims (2)

A forgery-preventing paper in which a thread provided with a forgery-preventing layer is formed between paper layers, a paper layer formed by combining one paper layer or a plurality of paper layers located on the surface side of the thread; and An anti-counterfeit paper characterized in that the opacity coincides with a paper layer or a paper layer formed by combining a plurality of paper layers located on the back side of the thread .   An anti-counterfeit printed matter using the anti-counterfeit paper according to claim 1.

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