JP3022084B2 - Anti-counterfeit paper and anti-counterfeit printed matter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to anti-counterfeit paper and anti-counterfeit printing. More specifically, the present invention relates to anti-counterfeit paper and anti-counterfeit printed matter whose authenticity can be easily discriminated even when a forgery is attempted by copying with a color copying machine.

[0002]

2. Description of the Related Art In recent years, the accuracy of copying machines has been remarkably improved, and in particular, the spread of electrophotographic color copying machines has facilitated forgery of various securities and has become a social problem. To prevent this, various anti-counterfeiting means have been considered, but one of them is to utilize the fact that current copiers cannot reproduce brilliant ones, for example, metallic colors or interference colors. There is something.

For example, as proposed in Japanese Utility Model Application Laid-Open No. 58-168754, a luminous plate such as an aluminum foil having a remarkable metallic color is provided on the upper surface of a base paper, and a character pattern is formed on the luminous plate surface. There is a proposal for paper that cannot be copied by the machine.
When this is copied, the character pattern applied to the paper surface becomes unreadable because the foil surface is darkened and copied when light is irradiated from the copying machine. This sheet has the advantage that copying itself cannot be performed (the copy cannot be read), but has the disadvantage that the metallic color is emphasized too much because the area of the glittering plate occupying the sheet is so uncomfortable. In addition, there are other problems, such as a complicated paper manufacturing process, which inevitably increases the cost, and difficulty in recovering papermaking fibers from waste paper.

[0004] The present inventors have conducted studies for the purpose of solving these problems. The inventors of the present invention have changed their minds and have noticed that even if they are copied with a color copying machine, they can be copied in a different hue from the original document, or if they are not copied at all, it can be determined whether they are genuine or not. .

The present inventors first sliced a silver-aluminized polyester film excellent in brilliancy,
We considered making it into paper. Since the paper produced in this manner cannot reproduce the metallic glitter in a color copying machine, the portion where the strips are mixed is simply copied in black, which proves to have a forgery preventing ability. However, it was found that in the paper manufactured in this manner, the strip did not adhere firmly to the paper, and the strip was dropped during printing, causing a serious problem.

[0006]

The present inventors have proposed a forgery prevention paper which has solved the above problem as Japanese Patent Application No. 5-11409. The gist of the present invention is that in a forgery prevention paper in which glittering strips are ubiquitously present on the surface of the base paper, the strips have a performance capable of adhering to the base paper in the paper making process. Anti-counterfeit paper.

The present inventors have also filed Japanese Patent Application No. 5-124880.
The issue of "forgery prevention paper and forgery prevention printed matter" was proposed. The gist of the present invention is to obtain a forgery prevention paper having a partial coating layer mainly composed of a pearl pigment and an adhesive formed on the surface of a base paper, and performing a predetermined printing using this gist. An object of the present invention is to obtain a forgery prevention printed matter.

The present inventors have further studied and completed a forgery prevention paper and a forgery prevention printed matter having a configuration different from the above proposal.

[0009]

The present invention will be described with reference to FIG. FIG. 1 is a perspective view and a sectional view of an example of the forgery prevention sheet of the present invention. The cross-sectional view is a partially enlarged cross-section taken along the line AA in the perspective view. In the present invention, a thread 1 formed by slitting a pearl pigment coated paper coated with a coating liquid mainly composed of a pearl pigment and a binder into at least one surface of a base paper 2 is formed. The forgery prevention paper is characterized in that:

FIG. 2 is a top view of an example of a forgery-preventing printed material according to the present invention. The thread is formed by slitting a pearl pigment coated paper coated with a coating liquid mainly composed of a pearl pigment and a binder. 1 is a forgery-prevention printed matter, characterized in that forgery-prevention paper is used as the base paper 2 on one side of the base paper 2, and at least a part of the thread is printed 21 with a pattern that is not printed. is there.

As the pearl pigment used in the present invention, any of known pearl pigments such as natural pearl essence, mica powder, mica powder coated with titanium oxide, basic carbonate and fish scale foil can be used. These production methods are described in JP-B-35-5367, JP-B-39-28885, JP-B-48-23179, JP-B-47-29569, JP-B-53-47375,
JP-B-56-39669, JP-B-58-7767,
Japanese Patent Publication No. 1-28733, Japanese Patent Publication No. 4-48812, JP-A-58-174449, JP-A-58-180561
JP-A-58-219226, JP-A-59-782
No. 65, JP-A-60-92359, JP-A-62-34
962, JP-A-62-285596, JP-A-4-2
No. 27666, etc. can be used. Some pearl pigments emit an iris color and are characterized by a change in hue depending on the viewing angle. As the pearl pigment used in the present invention, it is particularly preferable to use a pearl pigment that emits this iris color. This is because the forgery-preventing ability is improved and the design effect is enhanced by forming threads that emit different iris colors into the base paper.

As the binder, synthetic rubber latex such as styrene / butadiene copolymer latex, methyl methacrylate / butadiene copolymer latex, synthetic resin emulsion such as polyacrylate emulsion, polyvinyl acetate emulsion, starch, casein, polyvinyl alcohol, etc. Natural or synthetic sizing agents can be used.

In the present invention, it is particularly preferable to use a binder which is insoluble in cold water and soluble in hot water at 50 ° C. or higher. Preferable examples of the binder having such properties include polyvinyl alcohol. Polyvinyl alcohol can be synthesized by changing the degree of polymerization and the degree of saponification, and can change the dissolution temperature in water. As will be described in detail later, a thread manufactured using such a binder does not elute the binder from the thread in the wet part of the papermaking process, but elutes due to the heat of the dry part, and has a property to adhere to the paper. .

In the present invention, a binder is usually used in an amount of 80 to 30 parts by weight based on 100 parts by weight of pearl pigment (dry part by weight, the same applies hereinafter).
A coating solution mixed with 0 parts by weight is prepared. At this time, defoamer,
Supplementary materials such as preservatives, fungicides, and viscosity modifiers may be appropriately mixed to such an extent that the present invention is not impaired. The coating solution thus prepared is applied to a base paper having a basis weight of 20 to 100 g / m 2 (dry weight, the same applies hereinafter), preferably 30 to 50 g / m 2, preferably 2 to 10 g / m 2, preferably 3 to 5 g / m 2. Apply m2. It is preferable that the base paper has excellent surface smoothness as much as possible in order to bring out the glitter of the pearl pigment. A white pigment coated paper having excellent water resistance is a preferred example, but as a result of studies by the present inventors, it has been confirmed that the object of the present invention can be sufficiently achieved even with high quality paper. The base paper preferably has a certain degree of size in order to prevent the penetration of the coating liquid, and preferably has a wet waterproof strength.

The pearl pigment coating layer is provided using a known coating machine, for example, a coating machine such as an air knife coater or a roll coater, or a gravure printing machine. The coating is preferably performed on both sides.

When a binder which is not soluble in hot water is used as the binder, it is insoluble in cold water such as polyvinyl alcohol and is further insoluble in hot water such as polyvinyl alcohol for the purpose of improving adhesion to the base paper. A soluble binder can be applied.

In the present invention, the base paper on which the pearl pigment is coated may be used together with a fluorescent coloring agent which emits a fluorescent color by ultraviolet rays. Further, a fluorescing agent which emits a fluorescent color by ultraviolet rays can be used in combination with the pearl pigment coating liquid. In these cases, it is preferable that the base paper does not use a fluorescent coloring agent that emits a fluorescent color. By doing so, the thread emits a fluorescent color when irradiated with ultraviolet rays, but when viewed under a normal light source, the appearance is almost the same as when the fluorescent colorant is not used. By doing so, the forgery prevention performance of the paper can be further improved. By irradiating the paper with ultraviolet light, the thread emits a fluorescent color, and the authenticity can be easily determined.

Fluorescein, fluorescein,
Coumarin-based, oxazole-based, pyrazoline-based, thiadiazole-based, spiropyran-based, pyrenesulfonic acid-based, benzimidazole-based, diaminostilbene-based fluorescent dyes, and sulfide-based or oxide-based inorganic fluorescent materials such as zinc sulfide / copper active pigments Any agent can be used.

The pearl pigment coated paper produced in this manner is usually 0.5 to 5 m wide using a microslitter.
m, preferably about 2 mm in width to form a thread and wind it around a bobbin.

The base paper of the present invention comprises bleached softwood kraft pulp (NBKP), hardwood bleached kraft pulp (LBKP),
Mainly papermaking pulp such as softwood bleached sulphite pulp (NBSP) and thermomechanical pulp (TMP), with dry paper strength agent, wet paper strength agent, sizing agent, fixing agent, retention improver, and improved drainage Agents, defoamers, dyes, coloring pigments, fluorescent agents, etc., as appropriate, and usually has a freeness of 550.
~ 250 ml C.I. S. F. Using a well-known paper machine such as a fourdrinier paper machine or a round paper machine. In the present invention, it is also possible to apply starch, polyvinyl alcohol, various surface sizing agents and the like to the paper surface during the paper making process using a size press device or the like. This method is effective in improving the adhesion between the strip and the base paper when the binder constituting the pearl pigment coating layer is not soluble in hot water. Furthermore, machine calendar processing and super calendar processing are performed as necessary,
Improving the surface smoothness is also performed appropriately.

A thread formed from a metal-deposited film formed into a thread between paper layers is called "threaded paper" and used as anti-counterfeit paper. It is well known in foreign countries that this technology is applied to banknotes to enhance their anti-counterfeiting performance. In the present invention, unlike the conventional thread-filled paper, the thread needs to be formed on at least one surface of the base paper when forming the base paper. For example, the thread is formed by the following method. In the present invention, "making in" refers to a state in which a thread is exposed on the surface of the base paper or a part of the base material is covered with the stock. In the present invention, it is necessary that the pearl brilliant color of the thread is ground in such a state that it can be visually recognized. 1) Immediately after slicing the fourdrinier, the thread is unreeled from the bobbin, placed on a paper web, and laid on the surface. 2) After forming a web with a fourdrinier or a round net, a thread is unwound from a bobbin onto a press roll, and the thread is formed on the surface of the web. 3) The thread is fed from the bobbin onto the cylinder after the paper layer of the bat of the round paper machine is formed, and is made into paper.

The thread may be provided on one side of the base paper or on both sides. The paper web thus formed is heated and dried in a drying zone of a paper machine such as a cylinder drier or a Yankee drier. In the initial stage of drying, the paper web contains a large amount of water, so hot water also comes into contact with the thread, and the thread using a hot water-soluble binder swells or partially dissolves the binder and firmly adheres to the base paper. Glue to

The forgery prevention paper of the present invention can be used in combination with other forgery prevention means. For example, clarification, blending with dyed fibers, threading, etc. Thereby, the forgery prevention effect can be further enhanced.

The present invention relates to the base paper thus produced,
A pigment coating layer having good printability can be provided on the surface opposite to the surface into which the thread is formed. In this way, anti-counterfeit paper capable of high-level multicolor printing can be obtained. In order to improve the printability of paper, it is known to provide a pigment coating layer mainly composed of a white pigment such as kaolin or calcium carbonate and a binder on the surface. Have been. Any of these known formulations can be used for the pigment coating layer of the present invention. For example, a white pigment such as kaolin or calcium carbonate is dispersed in water, and a binder such as starch, casein, or synthetic rubber latex and, if necessary, an auxiliary material for coating are appropriately used, and a blade coater or an air knife is used. Using a known coating machine such as a coater, coating is usually performed at 5 to 25 g / m 2, and a super calender treatment is performed.

The anti-counterfeit paper of the present invention is manufactured as described above. The production of the anti-counterfeit paper of the configuration of the present invention requires a high level of technology, and the glitter and texture of the thread cannot be obtained by other means. When a printed material is manufactured using the anti-counterfeit paper of the present invention, when printing is performed on the surface of the thread, it is preferable that at least a part of the thread is printed with a pattern that is not printed. This is because when printed on the surface of the thread, the glitter of the pearl pigment tends to be lost, and the forgery prevention effect is reduced.

FIG. 2 is an example of a forgery-prevention printed matter manufactured using the forgery-prevention paper of the present invention, as described above, and shows an example in which a ticket is produced. Reference numeral 21 denotes a printed portion, in which a white portion 22 (a portion not subjected to printing) is formed, and a perforation 23 is provided. Since the thread of the printing portion 21 is covered with ink, the pearlescent color is considerably lost, but is clearly visible in the white portion.
When this ticket is copied by a color copier, the hue of the printed portion is reproduced, but the pearlescent color of the white portion is not reproduced at all. Therefore, even if an attempt is made to enter using a ticket forged by a color copying machine, the authenticity of the ticket is easily determined.

The reason why the glitter color of the pearl pigment is not copied is as follows.
It was presumed to be due to the following. The pearl pigment is composed of particles having a plate-like crystal structure, and the pearl brilliant color is generated by multiple reflection of light incident from the surface, and has a gentle brilliant feeling instead of a brilliant brilliant like a metal-deposited surface. The color copying machine employs a method in which irradiation light is incident on a document at about 45 degrees, and the photosensitive drum is exposed with reflected light at about 90 degrees. At this angle the pearlescent color is almost lost and the pearl pigment color is not reproduced in the copy.

[0028]

【Example】

Example 1 Manufacture of thread Milk-white pearl pigment of titanium oxide-coated mica powder (trade name "Iliodin 100", manufactured by Merck Japan Ltd.) on both sides of base paper having a basis weight of 35 g / m2 and good wet strength and good size. Using a paint consisting of 100 parts by weight and 100 parts by weight of polyvinyl alcohol (manufactured by Kuraray Co., Ltd.) having a hot water dissolving temperature of about 60 ° C., using an air knife coater for one side 5
g / m2. Next, a thread having a width of 2.5 mm was manufactured using a microslitter and wound around a bobbin. Prescription of base paper and manufacture of base paper 350 ml 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. At the time of making a paper having a basis weight of 110 g / m2 using a circular paper machine, the thread having the above-described configuration was unwound from the bobbin at an interval of 100 mm immediately before the press roll. Thereafter, it was manufactured according to a conventional method (drying was performed with a multi-cylinder cylinder dryer).

Example 2 The pearl pigment of Example 1 was replaced with a pearl pigment emitting a red iris color (trade name “Merlin Raster Pigments, Highlight Super Redd 9430Z”, manufactured by Marl Corporation), a green rainbow Instead of a pearl pigment that produces coloring (trade name “Marlin Raster Pigments, Highlight Super Green 18430Z”, manufactured by Marl Corporation), separate coating liquids were prepared for each, and the other pearls were the same as in Example 1 Pigment coated paper was manufactured. Next, a thread having a width of 2.5 mm was manufactured using a microslitter and wound around a bobbin. With the same prescription as in Example 1,
When making a paper having a basis weight of 110 g / m2 using a fourdrinier paper machine, the two types of threads having the above-described structure were alternately unwound from a bobbin at an interval of 10 mm immediately before the press roll, and thereafter manufactured according to a conventional method (drying was performed frequently). Performed with a cylindrical cylinder dryer).

Coating of pigment coating liquid Kaolin (trade name "UW90", Engelhard Co., Ltd.)
50 parts by weight, 50 parts by weight of calcium carbonate (trade name "Tamapearl TP222H", manufactured by Okutama Industry Co., Ltd.), 0.25 parts by weight of dispersant (sodium tripolyphosphate), oxidized starch (manufactured by Nisseki Chemical Co., Ltd.) ) 6 parts by weight of styrene-butadiene copolymer latex (trade name "Nipol L
X407C ", manufactured by ZEON CORPORATION) of 15 g / m @ 2 using an air knife coater on the surface of the base paper opposite to the threading surface of the thread. Rendered to produce anti-counterfeit paper.

Pulp Recovery Test A pulp recovery test was carried out using a high-concentration pulper using the paper after the papermaking of Example 1. When 5 parts by weight of paper, 95 parts by weight of water (that is, pulp concentration: 5%), and caustic soda were charged into the pulper at a ratio of 0.1 part by weight, and rotated while blowing live steam, the temperature was raised to 60 ° C. Completely disintegrated. The pearl pigment is finely divided and completely dispersed in the pulp, and the content thereof is extremely small. Therefore, even if the recovered pulp is used for papermaking, this effect was not recognized at all.

[0032]

As described above, the anti-counterfeit paper and anti-counterfeit print of the present invention are manufactured and have remarkable effects as described below. 1) Since the glitter of the thread used is the glitter of the pearl pigment, there is no discomfort when viewed with eyes. 2) Even if copying is attempted with a color copying machine, the brilliant color of the pearl pigment of the thread formed on the paper cannot be reproduced, so that it is possible to immediately judge whether or not the copy is forged. 3) In particular, by using a strip using a pearl pigment that emits an iris color, it is possible to obtain anti-counterfeit paper having excellent design properties. 4) By making the binder used for the pearl pigment coating layer a hot water-soluble binder, the binder can be firmly adhered to the base paper in the dryer part without being dissolved in the wet part of the paper machine. When printing is performed on the surface, the problem of the thread falling off during printing does not occur. 5) Papermaking fibers can be easily recovered from waste paper and waste paper. 6) Forgery prevention paper having a configuration in which a pigment coating layer having good printability is provided on one side enables high-grade multicolor printing. 7) By taking advantage of such characteristics, the anti-counterfeit paper of the present invention can be suitably used for check paper, stock paper, bond paper, bill paper, gift certificate paper, passport paper, various ticket papers, boarding tickets, and the like.

[Brief description of the drawings]

FIG. 1 is a partially enlarged sectional view of a forgery prevention sheet of the present invention.

FIG. 2 is a top view of an example of a forgery-prevention print of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Thread 2 Base paper 3 Pigment coating layer 21 Printing part 22 White part

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) D21H 17/00-27/42 G03G 21/00

Claims (7)

(57) [Claims] 1. A thread 1 formed by narrowly slitting a pearl pigment-coated paper coated with a coating liquid mainly composed of a pearl pigment and a binder is formed on at least one surface of the base paper 2. Anti-counterfeit paper characterized by the fact that 2. The forgery prevention paper according to claim 1, wherein the binder is insoluble in cold water and soluble in hot water at 50 ° C. or higher. 3. The forgery prevention paper according to claim 1, wherein the pearl pigment is a pearl pigment having an iris color. 4. The anti-counterfeit paper according to claim 1, wherein the base paper coated with a coating liquid mainly composed of a pearl pigment and a binder uses a fluorescent coloring agent in combination. 5. The anti-counterfeit paper according to claim 1, wherein a fluorescent color former is used in combination with a coating liquid mainly composed of a pearl pigment and a binder. 6. One surface of a base paper is a surface on which a thread formed by slitting a pearl pigment-coated paper coated with a coating liquid mainly composed of a pearl pigment and a binder into a narrow width is used. Anti-counterfeit paper characterized in that a white pigment coating layer having good printability is provided on the surface of (1). 7. A thread 1 formed by narrowly slitting a pearl pigment coated paper coated with a coating liquid mainly composed of a pearl pigment and a binder, is formed on one surface of the base paper 2. A forgery-prevention printed matter, wherein forgery-prevention paper is used and at least a part of the thread is subjected to printing 21 with a pattern such that printing is not performed.