JPH1134474A - Manufacturing method of anti-counterfeit paper - Google Patents

Abstract

(57) An object of the present invention is to provide a forgery prevention paper having a watermark pattern and a method for manufacturing the forgery prevention paper having strips or threads partially exposed. At least one or more air nozzles attached to a wire part of a web paper machine when making at least one or more paper layers A and another paper layer B by a web paper machine. A method for producing a forgery prevention paper, characterized in that a watermark pattern, a strip or a thread is partially exposed in a window shape by injecting compressed air onto the surface of the paper layer B.

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 anti-counterfeit paper. More specifically, anti-counterfeiting paper that can be distinguished at a glance by a special watermark manufacturing method, and a copy that has a completely different color tone from the original (genuine) even if it is copied by a color copier or copied by an image processing system The present invention relates to a method for producing a forgery prevention paper from which only a product or a copy can be obtained.

[0002]

2. Description of the Related Art It is well known in the art to provide a banknote with a watermark pattern and to insert a protective strip or thread made of a plastic film into a counterfeit. In particular, as is presently the case in pound notes, the method of producing those protective strips or those having a window free of stock on a part of the thread is described in EP0059056 filed in Europe and the United States by Portals, UK. And US Pat. No. 4,462,866.
These are production methods using a so-called circular paper machine, and when a cylindrical wire mesh (cylinder mold) whose part of the surface is processed into an uneven shape rotates in a vat containing a stock suspension, The strip or yarn rotates together while contacting the irregularities on the processed surface, and as a result, the portion of the strip or yarn that was in contact with the convexities on the wire mesh surface has stock on it. No, this is a manufacturing method that becomes a so-called window.

[0003]

As a method for producing a protective strip made of a plastic film or a paper having a window in which a stock is not present in a part of the yarn, there is disclosed in the above-mentioned EP0059056 of Portals, UK. The mesh making method described in U.S. Pat. No. 4,462,866 and U.S. Pat. No. 4,462,866 has a relatively low sheet forming speed due to its mechanism, and forms a window by processing a metal mesh into an uneven shape. There is a problem that the interval and the size of the images cannot be changed.

Therefore, a compressed air nozzle for injecting compressed air into a rotating drum is provided on a fourdrinier wire, and a compressed air injection hole for injecting compressed air into a stock suspension layer is opened. A rotating drum having a rotation control mechanism is installed, and the strip or the stock suspension layer on the yarn previously inserted into the stock suspension layer on the wire is moved by blowing compressed air, and the paper is moved to the section. A method and an apparatus for forming a so-called window in which no material is present are disclosed in JP-A-6-2722.
No. 00 discloses this.

However, the method does not mention the positional relationship between the insertion position of the strip and the rotating drum,
Because this paper machine is a single layer paper layer using a fourdrinier paper machine, depending on the position where the strip is inserted, the moisture in the paper layer is too low, so that even if compressed air is blown, the window is formed. If it is difficult, or if the nozzle is installed at the moisture position of the paper layer where the window can be formed well, it is too close to the head box and the insertion of the strip into the stable paper layer this time In this method, it was difficult to produce a sheet having a window as desired. SUMMARY OF THE INVENTION It is an object of the present invention to provide a manufacturing method and a manufacturing apparatus capable of easily changing the interval and size of a window portion during manufacturing of the paper.

[0006]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to solve these problems, and as a result, have come to invent a method of manufacturing a forgery prevention paper of the present invention. That is, the method for producing a forgery prevention paper of the present invention comprises at least one or more paper layers A
And at the time of laminating another paper layer B by the web paper machine, compressed air is injected to the paper layer B surface by at least one or more air nozzles attached to the wire part of the web paper machine. It is characterized by forming a watermark pattern and combining them.

Another method for producing a forgery prevention paper according to the present invention is a method for winding at least one or more paper layers A onto a bobbin when the other paper layer B is formed by a round paper machine. After the provided strip or yarn is provided on the paper layer A, the paper layer B is laminated, and the surface of the paper layer B is formed by at least one or more air nozzles attached to a wire part of the web paper machine. The compressed air is injected to partially expose the strip or the yarn.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a method for producing a forgery prevention paper of the present invention will be described in detail.

The stock preferably used for the anti-counterfeit paper of the present invention is composed mainly of wood pulp and filler. As wood pulp, chemical pulp such as LBKP, NBKP, GP, PGW, RMP, TMP, CTMP, C
Including mechanical pulp such as MP and CGP, pulp such as waste paper pulp such as DIP, etc., if necessary, conventionally known pigments, binders and sizing agents, fixing agents, retention agents, cationizing agents, paper strength agents, etc. It is adjusted by mixing one or more kinds of various additives.

As the filler, for example, light calcium carbonate, heavy calcium carbonate, kaolin, clay, talc,
Of calcium sulfate, barium sulfate, titanium dioxide, zinc oxide, zinc sulfide, satin white, aluminum silicate, diatomaceous earth, calcium silicate, magnesium silicate, synthetic silica, aluminum hydroxide, alumina, lithopone, zeolite, magnesium carbonate, magnesium hydroxide Such as white inorganic pigments, styrene-based plastic pigments,
Organic pigments such as acrylic plastic pigments, polyethylene, microcapsules, urea resins, and melamine resins.

Examples of the sizing agent include rosin sizing agents for acidic papermaking, modified rosin sizing agents for neutral papermaking, AK
D, ASA, cationic polymer type sizing agents, and the like.

Using such a stock, a multi-row paper machine capable of forming at least one or more paper layers A and another paper layer B by a circular paper machine is used. The anti-counterfeit paper having a multilayer structure of the present invention can be manufactured.

For example, FIG. 1 shows an example of a two-row circular web paper machine for producing a laminated paper made of two paper layers, and forms a paper layer A having neither a watermark portion nor a window portion. And a wire part 2 of a circular net type for forming an outermost paper layer B having a watermark portion or a window portion. This example is merely an example of the paper machine used in the present invention, and at least one or more paper layers A
Any paper machine of a multi-row type that can combine the paper layer B with another paper layer B by a round paper machine is not limited.

A large number of air nozzles 3 for spraying compressed air, which are referred to in the present invention, are arranged in the wire wire part 2 forming the outermost paper layer B, and are controlled by various flow rates and timings. The compressed air nozzle injects various patterns of compressed air into the paper layer forming section of the wire part, thereby forming a window pattern in which a watermark pattern composed of portions having locally different masses or the outermost layer stock does not exist. be able to.

It is preferable that a large number of air nozzles in the wire part are provided at positions where the suspended stock on the wire is dewatered. The diameter of the air nozzle is several cm or less, and the pressure of the compressed air to be injected is usually 0.3 to 3.0 kg / cm ² . The direction in which the compressed air is jetted from the air nozzle is effective in a direction perpendicular to the paper layer forming surface or at an angle close to the perpendicular. An electromagnetic valve is attached to each air nozzle, and can be adjusted so that opening and closing can be controlled from the outside at a timing according to a pattern to be formed. In addition, each air nozzle can freely form a pattern portion and a shade of a watermark by mechanically moving its jetting portion up and down, left and right, and back and forth, or by raising and lowering or interrupting its jetting pressure.

When a watermark pattern according to the present invention is formed by using such an apparatus, it is possible to form a pattern for jetting compressed air into a desired figure, character, or the like. In addition, as shown in FIG. 1, a strip or thread consisting of a bobbin on which a strip or thread is wound and a fixing portion is inserted between the outermost paper layer B and the paper layer A formed up to that point. Strips or yarns are inserted from the device 4 installed for insertion between the layers, and compressed air is applied at an appropriate interval and an appropriate width to the paper layer forming portion of the mesh wire part forming the outermost paper layer B. By removing the outermost paper layer by spraying, it is possible to partially expose the strip or the yarn.

In the anti-counterfeit paper of the present invention, starch, polyvinyl alcohol, various surface sizes and the like can be coated on the paper surface by a size press device or the like during the paper making process. Further, if necessary, a machine calendering treatment or a super calendering treatment is performed to improve the surface smoothness as appropriate.

Examples of the strip or thread used in the present invention include gold-silver strips or gold-silver threads, hologram strips or hologram threads, magnetic strips or magnetic threads, fluorescent coloring strips or fluorescent coloring threads. Different types of strips or yarns can be used.

For example, a gold-silver strip can be produced by vacuum-depositing metallic aluminum on a polyester film, coating a resin for protection on the vapor-deposited surface, and slitting it with a microslitter.

The forgery prevention paper of the present invention usually has a basis weight of 50 to 2
Manufactured at 00 g / m ² . Further, the ratio of the outermost paper layer B to the other paper layer A is preferably 20:80 to 80:20. The attachment ratio is, for example, a basis weight of 100
As the production of paper two layers Extract alignment g / m ^2, it puts the ratio 20:80 to outermost paper layer B is 20 g / m ^2, the other paper layer A is composed of 80 g / m ² Means If the application ratio of the outermost paper layer B is less than 20, there is a problem that the sharpness of the watermark pattern or the like is lost, and when the strip or the thread is partially exposed, the strip or the thread peels off during printing. On the other hand, if it exceeds 80, there are problems that the watermark pattern and the like are easily broken, and it becomes difficult to expose the strip or the thread.

The anti-counterfeit paper of the present invention has a heat-sensitive recording layer, a pressure-sensitive recording layer,
It is also possible to provide various functional coating layers such as a magnetic recording layer, an ink receiving layer, an adhesive layer, a release layer, a coated layer for printing, and a metal deposition layer. In addition, as a coating apparatus at that time, an air knife coater, a gravure coater, a die coater, a blade coater, or the like is used.

[0022]

EXAMPLES The present invention will be described below with reference to examples of the present invention, but the present invention is not limited to these examples.
Further, "%" shown in the examples indicates% by weight unless otherwise specified.

Example 1 [Preparation of pulp stock] Anionic polyacrylamide (Star Gum A15) was used for 100 g of wood pulp composed of 70 g of LBKP beaten to a freeness of 400 mlcsf with a double disc refiner and 30 g of NBLP beaten to a freeness of 450 mlcsf. , Manufactured by Seiko Chemical Co., Ltd.).
3 g, cationic starch (Kate F, manufactured by Oji National)
Was added, 0.4 g of an alkyl ketene dimer sizing agent (Hercon 11-2, manufactured by Dick-Hercules) and 0.3 g of a polyamide-polyamine-epichlorohydrin resin (Saimen S25, manufactured by Dick-Hercules) were added. The stock was adjusted to a 0.5% consistency.

[Preparation of anti-counterfeit paper] No work is applied to the first row of a two-row type circular web paper machine (1200 mm wide) as shown in FIG. Nozzle diameter 1 mm, spacing 10 at 100 mm position on the forming surface
mm, the pressure of the compressed air is 1.0 kg / cm ² , the injection timing is 0.1 seconds,
And 0.1 second stop, the timing of the start of injection for each air nozzle is changed at random, with machine speed 60 m / min by using the paper stock, so that the total basis weight 100 g / m ² 2-layer Extract alignment paper ( A first layer of 50 g / m ² and a second layer of 50 g / m ² ) were produced.
The produced patterned paper had a geometric pattern in which a large number of watermarks each having a width of 2 mm and a length of 100 mm were arranged.

Example 2 The interval of the air nozzles was 100 mm, the injection timing was 0.01 seconds, the injection was stopped for 0.005 seconds, and the first gold nozzle having a width of 2 mm was placed immediately below each air nozzle.
Except that the strip was inserted between the layer and the second layer,
A two-layer laminated paper was manufactured in the same manner as in Example 1. The produced paper had a 2 mm wide strip exposed in the longitudinal direction by 10 mm and buried between the 5 mm paper layers.

COMPARATIVE EXAMPLE 1 Using a fourdrinier machine made of a single layer, a gold strip having a width of 2 mm was inserted from the wire part immediately after the head box so as to be buried in the paper layer, and then the strip was inserted into the paper layer. The air nozzle used in Example 1 was installed at a position of 100 mm above the paper layer forming surface in a state of being stably buried, and the compressed air was injected from the air nozzle to produce a forgery prevention paper having a window. The paper layer on the strip could not be blown off due to too low moisture in the layer and no window could be formed. Therefore, the installation position of the air nozzle was changed in the direction of the head box where the moisture of the paper layer was high,
This time, the buried state of the strip was not stable in the paper layer, and compressed air was blown with an air nozzle, but the desired window could not be formed.

[0027]

As described above, according to the present invention, a multi-row paper machine capable of laminating at least one or more paper layers A and another paper layer B by a round paper machine is used. , Just install a simple compressed air nozzle in the circular mesh part,
Forgery-preventing paper having a watermark pattern and a forgery-preventing paper having a window in which a strip or a thread is partially exposed, the forgery-preventing paper capable of freely changing the interval, pattern, and the like of the windows can be manufactured. Furthermore, unlike other methods, such as forming a concave and convex mold on the cylinder part of the wire part, the paper machine does not need to be remodeled significantly, so the remodeling cost is relatively low and the forgery prevention is highly practical. It can be said that this is a method for manufacturing paper.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing one example of a multi-row circular net paper machine used for producing the forgery prevention paper of the present invention.

[Explanation of symbols]

Reference Signs List 1 wire part for forming paper layer A having neither watermark nor window 2 wire part for forming outermost paper layer B 3 air nozzles for spraying compressed air 4 strips or yarns are wound Installed to insert strips or yarns consisting of fixed bobbins and fixed parts between paper layers

Claims (2)

[Claims] 1. At least one air layer attached to a wire part of a web machine when at least one or more paper layers A are combined with another paper layer B by a web machine. A method for producing forgery-prevention paper, characterized in that compressed air is jetted onto the surface of the paper layer B by means of a nozzle to form a watermark pattern and make the sheets together. 2. A strip or thread wound on a bobbin is provided on the paper layer A when at least one or more paper layers A are combined with another paper layer B by a round paper machine. After that, the paper layer B is laminated, and compressed air is jetted to the surface of the paper layer B by at least one or more air nozzles attached to a wire part of the web paper machine to partially remove the strip or the yarn. A method for producing anti-counterfeit paper, characterized in that the paper is exposed to light.