JP2845197B2 - Manufacturing method of anti-counterfeit paper - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing forgery prevention paper. More specifically, counterfeiting is called "windowed threaded paper" in which threads made between the paper layers of multiple paper layers are exposed at the window provided on the outermost paper layer. The present invention relates to a method for manufacturing prevention paper.

[0002]

2. Description of the Related Art Threaded paper in which a thread is inserted into a paper layer
Anti-counterfeit papers, which are referred to as, are well known. As a typical example of the thread, there is a thread as described later in detail. Paper that incorporates these requires extremely advanced technology for production, so it is very effective in preventing forgery,
It is often used for banknotes in various countries.

[0003] There are two main types of threaded paper. One is a type in which a thread is inserted into a sheet and is not exposed on the surface of the sheet, and the other is a type called "window-opening threaded paper" in which a part of the thread is exposed on the surface of the sheet.

[0004] As the former method for producing paper, a nozzle is inserted into the flow of stock in a sliced portion of a fourdrinier paper machine, and a thread is drawn out while flowing water through the nozzle to form a paper web formed on a papermaking net. A method of milling a filamentous material in
No.-130309) or a method of installing a device for inserting a thread into the stock flowing out of a flow box of a fourdrinier paper machine, and making the thread and the stock in a non-contact state with an air flow to form the thread ( JP-A-2-169790) Using a round paper machine having two or more tanks, feeding two or more layers, and sending out a thread-like material between paper layers by using a feeding pipe having unevenness on the inner wall. , A method of forming a thread between paper layers (Japanese Patent Publication No. 5-400)
No. 80) has been proposed.

As a method of manufacturing the latter "paper with a window opening thread", a belt mechanism having a groove through which a thread is passed at the tip of a convex portion of a guide having an uneven portion is buried in a stock suspension on a wire. Manufacturing method (Japanese Patent Publication No. 5-85680)
Or, use a net processed into an uneven shape for the upper net of a circular net paper machine,
A method in which a thread is inserted into a window opening by inserting a thread into contact with the uneven portion of the net surface (US Patent No. 44628).
No. 66) or a method in which a compressed air nozzle is built in a rotating drum on a wire of a fourdrinier paper machine, and a slurry on a filament inserted into a web is intermittently blown off with compressed air to expose the filament. (JP-A-6-272200) and the like have been proposed.

On the other hand, "inserted paper" in which characters and images are "inserted" into paper requires a high level of technology for its manufacture, and has been used for a long time to prevent forgery. The use of multiple anti-counterfeiting means for the anti-counterfeiting paper is more excellent in anti-counterfeiting.Therefore, like a British pound bill, a threaded window opening is provided at a predetermined position, and a person is placed at a different position. As in the example with the statue plowed, the above-mentioned "with window-opening thread"
A variety of anti-counterfeit papers using both the above-mentioned technology and the “plow-in” technology are also manufactured.

[0007]

However, a common problem with these papers is that the paper cannot be wound into a long length in a roll. Threads usually have a thickness of several tens of μm, and are continuously milled at a specific position on the paper, so when wound up in a roll, the thickness of the paper at the point where the thread is milled is partially This is because the film gradually becomes thicker, and wrinkles will be formed at that location. According to the study by the present inventors, when a thread having a thickness of about 15 μm is continuously machined on paper of 100 g / m ² , when the thread is wound up into a roll shape of about 1000 m, wrinkles occur at the thread insertion portion. I confirmed. If wrinkles occur, the paper after the wrinkles will be defective even if the paper is further wound up. Whether or not the paper can be wound into a roll has a great effect on productivity when printing on the paper later. This is because if the paper cannot be roll-finished, it must be finished in plain format.

[0008] In the forgery prevention paper in which the above-mentioned technology of "with window thread" and the technology of "pull-in" are used in different portions of the paper, a "window-threaded" portion and a "plow-in" are used. There is a problem that printing is difficult on the part and only a very light color can be printed even when printing, so there are restrictions on the print design such as a decrease in the paper surface on which decorative printing can be performed. Was. SUMMARY OF THE INVENTION An object of the present invention is to provide a method for producing a new and improved forgery prevention paper which can solve these problems.

[0009]

Means for Solving the Problems The occurrence of wrinkles when the paper is wound into a roll during the production of threaded paper is caused by the fact that the thickness of the paper is locally increased by inserting the thread as described above. It is due to going. To solve this problem, the present inventors have made various studies based on the idea that if the paper thickness is partially reduced so as to offset the local increase in the paper thickness, wrinkles will disappear. went. As a result, it has been found that the above problem can be solved by providing a window opening of a specific size with a reduced paper thickness on the surface of the paper and milling the thread so that the thread is exposed at the window opening. Was. However, in this method, when the paper is held over light, the entire window opening portion appears to be transparent and white, so that it feels very unnatural. The inventors of the present invention have continued their studies, and it is possible to eliminate the drawback by providing a puncture made of characters and images inside the window opening. It was found that by applying it to the same place, the design restrictions when printing on paper could be eliminated.

The present invention provides a method for producing a new and improved anti-counterfeit paper as described above, characterized in that at least one of the outermost paper layer and the other paper layers is provided. When producing a two-layered laminated paper using a multi-tank-type circular web paper machine, (a) a paper layer other than the outermost layer is formed in a tank before the final tank, and the flow direction of the paper layer in the final tank Forming an outermost paper layer having a window opening intermittently and having a cut-in made of characters or images in the window opening, or (b) flowing the paper layer in the first tank. Forming an outermost paper layer having a window opening intermittently in the direction and having a penetration made of characters or images in the window opening, and forming a paper other than the outermost layer in the second and subsequent tanks; Just before the outermost paper layer and other paper layers are superimposed on each other, at the window opening of the outermost paper layer. Threads to location and inserted into the paper layers, whereby consists in obtaining Extract alignment paper window opened a thread by having a plow insertion and window opening portion portion of the outermost layer of the paper layer is exposed.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION In order to make it easier to understand the method for producing anti-counterfeit paper of the present invention, 2 papers formed by the method of the present invention are used.
Referring to FIG. 1 showing an example of a gift certificate using forgery prevention paper made of layered laminated paper, FIG. 2 which is a partially enlarged view thereof, and FIG. 3 which is a partial sectional view, forgery obtained by the method of the present invention. The configuration of the prevention sheet will be described. In other words, the illustrated anti-counterfeit paper is composed of the outermost paper layer 3 and the paper layers 4 other than the outermost layer.
The outermost paper layer 3 is provided with a window opening 1 intermittently in the longitudinal direction of the paper (the flow direction of the paper layer during papermaking). Alternatively, a clearance 2 composed of an image is provided. A thread 5 is inserted between the outermost paper layer 3 and the paper layer 4 in contact with the outermost layer, and the thread 5 is exposed at the window opening 1. The present invention is a method for reliably and efficiently producing a forgery prevention paper having such a configuration.

In carrying out the method for producing a forgery prevention paper of the present invention, a stock is first prepared. The preparation of the stock is made of softwood bleached kraft pulp (NBKP), hardwood bleached kraft pulp (LBKP), softwood bleached sulphite pulp (N
BSP) or other non-wood pulp made from raw materials such as hemp, cotton and straw, etc., are appropriately mixed and beaten, and the mixture is filled with filler, dry paper strength agent, wet paper strength agent, sizing agent, fixing agent, A retention aid, a drainage improver, an antifoaming agent, a dye, a coloring pigment, a fluorescent agent, etc. are appropriately added, and usually a freeness of 400 to 250 m
1C. S. F. Adjust to

In general, a multi-vessel type circular paper machine is used for the production of two or more layers of laminated paper, but a multi-vessel type circular paper machine can be used in the present invention. FIG. 4 shows an example of a two-tub-type circular web paper machine for producing a laminated paper comprising two paper layers 3, 4 (FIG. 3). A first tank (tank before the last tank) 11 for forming the paper layer 4 other than the outer layer, and a second tank for forming the outermost paper layer 3 having the window opening 1 and the clearance 2. A tank (final tank) 12 is provided.

The upper net 12 of the cylinder 12a of the tank 12
As shown in FIG. 5, a mold 13 corresponding to the window opening 1 made of metal, resin, paper, or the like is attached to b with a thin metal wire, soldered, or attached with an adhesive. The shape of the mold 13 corresponding to the window opening is rectangular in the illustrated example, but may be any other shape such as a square, a circle, an ellipse, and the like. At this time, a part of the mold 13 is provided with a defective portion 13a formed of a through hole for forming a clearance 2 for characters or images.

When the mold 13 as shown in FIG. 5 is attached to the upper net 12b of the circular cylinder of the tank 12 for forming the outermost paper layer 3, the flow direction of the paper layer indicated by the arrow W (the vertical direction of the paper) In the direction X) corresponding to the window opening 1
The mold 13 is intermittently attached at an interval such that a ratio of the length Y corresponding to the non-window-opening portion 6 located between the window-opening portions is 3: 1 to 1: 2. Is desirable. When the ratio of the window opening portion 1 is in this range, not only the effect of preventing wrinkles from occurring when the paper is continuously wound into a roll is ensured, but also the design of the paper surface is favorable.

An upper net without any work is mounted on the net cylinder 11a of the tank 11 of the net paper machine shown in FIG. The paper layer 4 made by the mesh cylinder 11a equipped with an upper net without any work is transferred to the blanket 14 and the mold 13 of the tank 12 is formed.
Is transported onto the mesh cylinder 12a on which the paper layer 3 is attached, and the outermost paper layer 3 formed by the mesh cylinder 12a is overlaid on the cylinder layer 12a to form a sheet in which the two paper layers are combined. The insertion of the thread 5 is performed at a position indicated by an arrow V immediately before the paper layer 4 and the paper layer 3 are overlapped. As a method of feeding the thread 5, a method of feeding the thread using a pipe having irregularities on the inner wall, as proposed by the same applicant as the present application in the above-mentioned Japanese Patent Publication No. Hei 5-40080, or The method proposed in the aforementioned US Pat. No. 4,462,866 can be employed.

Although the mold 13 attached to the mesh cylinder 12a is shown in some places in FIG. 4 and simplified, it is actually attached intermittently around the entire circumference of the mesh cylinder 12a.

According to the method of the present invention described above, forgery prevention paper having the structure shown in FIGS. 1 to 3 can be manufactured. That is, in the outermost paper layer 3 formed by the mesh cylinder 12a to which the mold 13 is attached, the window opening 1 where the stock is not put on the portion corresponding to the mold 13 is formed. A clearance 2 for a character or image on which a stock is placed is formed. By inserting the thread 5 between the paper layers 3 and 4 so as to enter into the window part 1, the thread 5 is exposed in the window part 1 and between the paper layers 3 and 4 in the non-window part 6. The thread is buried at the point.

In the method for producing anti-counterfeit paper of the present invention, it is possible to apply starch, polyvinyl alcohol, various surface sizes, etc. to the paper surface during the paper making process using a size press or the like. Further, if necessary, a machine calendering treatment or a super calendering treatment is performed to appropriately improve the surface smoothness.

As the thread 5 used in the present invention, any type of thread that has been conventionally proposed for preventing forgery, such as a thread for gold and silver threads, a hologram thread, a magnetic thread, and a fluorescent coloring thread, can be used. For example, a thread for gold / silver yarn is manufactured by vacuum-depositing metal aluminum on a polyester film, coating a resin for protection on the deposition surface, and slitting with a microslitter.
A gold thread can be manufactured by coloring the resin to be applied yellow. It is preferable that the thread be coated with a heat-sensitive adhesive. As a result, the heat-sensitive adhesive functions by the heat of the drying zone of the paper machine, and the thread and the paper are more securely bonded to each other.

In the present invention, the dimensions of the mold 13 used by being attached to the cylinder cylinder 12a are such that the length X in the flow direction W of the paper layer shown in FIG. The length Z is preferably set to 10 to 50 mm. The size of the mold 13 is the window opening 1 of the paper shown in FIG.
Is equivalent to the size of If the window opening 1 is smaller than this range, the characters or images inserted into the window opening 1 will be too small.
The exposure length is too long and the balance is poor in terms of design.

The anti-counterfeit paper obtained in the present invention is usually produced at a basis weight of 70 to 150 g / m ² . The ratio of the outermost paper layer to the other paper layers is 20:80 to 80:
It is preferably 20. The attachment ratio is, for example, when manufacturing two-layer paper with a basis weight of 100 g / m ² ,
The attachment ratio of 20:80 means that the outermost paper layer is composed of 20 g / m ² and the other paper layers are composed of 80 g / m ² . If the ratio of the outermost paper layer is less than 20, the characters or images to be inserted tend to lose sharpness, and if it exceeds 80, the characters or images to be inserted tend to be broken.

In the above-described embodiment, as shown in FIG. 4, a plain paper layer is formed in the first tank 11 in which neither a window opening nor a clearance is formed, and a second tank (final tank) 12 is formed. To form an outermost paper layer having a window opening and a clearance.
However, in the present invention, as shown in FIG.
An embodiment in which the outermost layer having a window opening and a clearance is formed in the first tank 21, and a plain paper layer is formed in the second tank (final tank) 22. In this case, the window opening and the mold 23 for making a clearance are attached by the same means as described above over the entire circumference of the upper mesh of the circular cylinder cylinder 21a of the first tank 21. Part 23a of the mold 23 for making
Is provided in a manner opposite to that of FIG. 5, as shown in FIG.

[0024]

EXAMPLES Example 1 Preparation of Paper Stock 350 parts by weight of 20 parts by weight of NBKP and 80 parts by weight of LBKP
C. S. F. 10 parts by weight of clay, 0.3 parts by weight of a paper strength agent (trade name "Polystron 191", manufactured by Arakawa Chemical Industry Co., Ltd.), a sizing agent (trade name "Size Pine E", Arakawa 1.0 part by weight (manufactured by Chemical Industry Co., Ltd.) and an appropriate amount of a sulfuric acid band were added to prepare a stock.

Production of a paper net A large number of resin plates having a short side of 10 mm, a long side of 25 mm, and a thickness of 0.3 mm were prepared, and a missing portion 13a having a width of 1.2 mm and consisting of characters "A" and "B" was prepared. The molds 13 were prepared at intervals (FIG. 5). Next, a mold 13 made of a resin plate is continuously attached to the upper net 12b (width 1300 mm) of the net paper machine at intervals of 5 mm (Y) with respect to the flow direction W of the paper layer using an adhesive. I pasted it. Six rows were attached at equal intervals in the width direction of the upper net 12b.

Paper making of paper The upper net without any work is attached to the round net cylinder 11a of the first tank of the two tank type round net paper machine as shown in FIG.
An upper net 12b to which the above-mentioned mold 13 was attached was attached to the second net cylinder 12a. The paper layer 3 of the second layer (outermost layer) formed in the second tank is overlapped with the paper layer 3 of the second layer formed in the first tank formed on the first layer formed in the first tank.
A two-layer laminated paper was produced at 0 m / min. At this time, a thread for gold and silver thread having a thickness of 15 μm and a width of 1.0 mm was placed between the first layer (50 g / m ² in terms of dry weight) and the second layer (50 g / m ² ). It was inserted at a position corresponding to the center of the mold 13 using the method proposed in JP-A-5-40080.
Next, the wet paper was dehydrated according to a conventional method, and then dried with a cylinder dryer to produce a forgery prevention paper made of two-layer laminated paper. In the obtained paper, the length X of the window opening 1 in the longitudinal direction of the paper is 10 mm, and the length Y of the non-window opening 6 is 5 mm.
In the window opening 1, a letter 2 of "A" and "B" having a width of 1.2 mm is formed, and a thread 5 is exposed inside the window opening 1, and a thread is exposed in the non-window opening 6. 5 was buried between the paper layers. When this paper was wound into a roll with a paper machine winder,
No wrinkling was observed even after winding up 6000 m.

[0027]

According to the method of the present invention as described above and the anti-counterfeit paper obtained by this method, the following remarkable effects can be obtained. 1) Since both the clearance 2 for characters and images and the exposed part of the thread 5 are formed in the window opening part 1, a forgery prevention paper which is not unnatural in design can be obtained. Also when printing on this paper, restrictions on the print design received when the clearance 2 and the exposed portion of the thread 5 are formed in different portions of the paper, for example, the print area is reduced when decorative printing is desired. Such a problem can be solved.

2) Even if the paper is continuously wound into a roll by a winder of a paper machine, wrinkles due to a partial increase in the thickness of the paper due to thread insertion can be completely eliminated. This makes it possible to use roll-finished paper in a rotary printing press when printing on paper, and the efficiency is significantly improved as compared with printing plain-finished paper.

3) Even when securities are manufactured using the obtained paper and a large number of securities are stacked, the handling is easy because there is no partial swelling at the thread insertion portion, and the stacked piles collapse. Not even. Similarly, even when a large number of sheets are stacked and read by an OCR automatic reading device or the like, the handling becomes easy because there is no partial swelling at the thread insertion portion.

The anti-counterfeit paper obtained according to the present invention by utilizing the above characteristics can be suitably used for bills, checks, stock certificates, bonds, gift certificates, cards, confidential documents, passports, identification cards, and the like.

[Brief description of the drawings]

FIG. 1 is a top view of an example of a gift certificate using forgery prevention paper obtained by the method of the present invention.

FIG. 2 is an enlarged view of a window opening portion of FIG. 1 as viewed from above.

FIG. 3 is an end view cut along line AA ′ of FIG. 2;

FIG. 4 is an explanatory view showing an example of a multi-vessel type round paper machine which can be preferably used in the method of the present invention.

FIG. 5 is a partial explanatory view showing a state in which a mold for forming a window opening and a clearance is attached to the upper net of the net cylinder used in the net paper machine of FIG.

FIG. 6 is an explanatory view showing another example of a multi-vessel type round paper machine which can be preferably used in the method of the present invention.

FIG. 7 is a partial explanatory view showing a state in which a mold for forming a window opening and a clearance is attached to the upper net of the net cylinder used in the net paper machine shown in FIG. 6;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Window opening part 2 Penetration 3 Outermost paper layer 4 Paper layer in contact with the outermost layer 5 Thread 6 Non-window opening part 11,21 Tank 11a, 21a before last tank Circular cylinder of tank before last tank 12 , 22 Final tank 12a Round cylinder cylinder in final tank 13,23 type 13a, 23a Missing part V thread insertion point

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) D21F 1/00-13/12 D21H 11/00-27/42

Claims (5)

(57) [Claims] When producing a combined paper comprising at least two layers, an outermost paper layer and another paper layer, using a multi-tank-type mesh paper machine, (a) a tank preceding the final tank. A paper layer other than the outermost layer is formed in the outermost layer having a window opening part intermittently in the flow direction of the paper layer in the final tank, and a crevice consisting of characters or images in the window opening part. Form paper layer or
Or (b) forming an outermost paper layer having a window opening intermittently in the flow direction of the paper layer in the first tank and having a penetration made of characters or images in the window opening; A paper layer other than the outermost layer is formed in the second and subsequent tanks, and the thread is positioned so as to be positioned at the window opening of the outermost layer immediately before the outermost layer and the other layer are overlapped. A forged paper having a gap in the window opening of the outermost paper layer and having a thread exposed at the window opening. Method. 2. A defect having a size corresponding to the window opening portion in a circumferential direction of an upper net of a net cylinder forming the outermost paper layer and forming a clearance for the character or image. A plurality of molds with parts formed are attached intermittently,
2. The method according to claim 1, wherein the outermost paper layer is formed using the circular cylinder. 3. A length (X) corresponding to a window opening portion of a sheet and a position between the window opening portions when the plurality of dies are circumferentially mounted on an upper net of the cylinder cylinder. The anti-counterfeit paper according to claim 2, wherein the molds are intermittently attached at intervals such that the ratio of the length (Y) of the non-windowed portion to be formed is 3: 1 to 1: 2. Method. 4. The size of the mold is a length (X) of 5 to 30 mm in a flow direction of the paper layer, and a length of 10 to 50 mm in a transverse direction (Z) perpendicular to the flow direction of the paper layer. The method for producing a forgery prevention paper according to claim 2. 5. The anti-counterfeit paper according to claim 1, wherein the outermost paper layer and the other paper layers are combined so that the application ratio is 20:80 to 80:20. Method.