KR101450614B1 - Security Paper Having Security Element of Discoloration by Chemical and Method for Manufacturing the same - Google Patents

Abstract

The present invention relates to a security paper which can be applied to a paper such as a check, a gift certificate, a banknote (banknote etc.), a passport, and the like, so that a color image expressing a discoloration function of a specific color in response to a solvent, an acid, an alkali, And a manufacturing method thereof. The security paper according to one aspect of the present invention includes fibers that are spinnable or formed into a film shape to include a solvent-discolorable dye or pigment, or a fluorescent dye or pigment, and when the fabric is 70 denier or more, Shaped or short fibers having a length of 2 mm or less and added to the cotton fiber or otherwise added to the cotton fiber with a length of 3 to 5 mm or less and the added fibers are added to the cotton fiber in an amount of 0.001 to 0.5 wt% Is added.

Description

Technical Field [0001] The present invention relates to a security paper having a security element having a chemical discoloring function and a method of manufacturing the security paper.

The present invention relates to a security sheet and a method of manufacturing the same, and more particularly, to a security sheet and a method of manufacturing the same, and more particularly, to a security sheet and a method of manufacturing the same, Or a security product including a passport, a certificate, or a certificate, and a method of manufacturing the security sheet.

Generally, securities used for the manufacture of securities, such as checks, banknotes, gift certificates, banknotes, security products such as passports, certificates, and certificates, threaten to be used for crimes by modifying face value or date. Techniques are being applied to develop a discoloration function by chemicals such as solvents, acids, alkalis, and bleaches with anti-counterfeiting function by preventing these crime threats.

US Pat. No. 5,123,999 discloses a technique for chemically reacting with a color developing substance such as sodium sulfide or sodium disulfite contained in an ink eraser on the surface of a paper for security products. .

French Patent FR-A-2365656 describes a technique in which when chemically reactive substances are added to phthalaine or sulfapthalene as an acidic indicator in the paper manufacturing process, colors appear when the pH of the ink comes in contact with the ink eraser US Pat. No. 4,618,402 discloses a technique in which a ferrous material is put into a security paper and the color changes while the iron material is transversed by a reducing agent or an oxidizing agent.

U.S. Pat. No. 4,149,661 discloses a technique in which microcapsulated loico ink and a color acceptor are put into a paper and the two components react with each other when pressure is applied to a writing instrument. US Pat. No. US3516846 discloses a technique in which particles encapsulating an oil- Describes a security paper in which the color of a dye is expressed when an added paper is prepared and reacted with pressure, heat and a specific solvent.

In addition, PCT Patent Publication No. WO9741181 (A1) discloses an ink prepared by mixing a pigment and a dye dissolving in a solvent as bleeding ink, printing on a security paper, and then contacting a specific solvent with a printing pattern, It deals with techniques for authenticity identification.

Japanese Patent JP200129596 discloses that when a water-insoluble and oil-soluble fluorescent dye is formed into particles of a certain size and added in the production of paper, particles of the fluorescent dye are not visible to the eye, but when a specific solvent is brought into contact with the paper, the fluorescent dye particles elute, The authenticity of the paper can be confirmed.

Japanese Patent JP200831594 discloses that when a water-insoluble, oil-soluble colorant is made into particles of a specific size and added or inked at the time of paper manufacture and coated on the paper surface, the particles of the colored dye are hardly visible to the eye, Which is a kind of paper, which is colored with colored dyestuffs.

However, such a conventional chemical discoloration technique is generally performed by mixing special dyes with a surface treatment agent or by adding them in a feedstock. When the dyestuff is dewatered by water in the pasture, the amount of the dyestuff is excessively increased. If the amount of the dyestuff exceeds the proper amount, the color of the paper may be changed.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide an acrylic fiber which exhibits fluorescence characteristics and is dissolved in a special solvent instead of nylon fiber used as a security chromatic aberration, Acid, alkali, bleach and the like in the above-mentioned fiber melt in a security coloring type security element made of chitosan fiber / cellulosic fiber, a security element made of bleach discoloration type fiber, or a polyvinyl fiber The present invention provides a security paper including a surface coated chemical discoloring security element and a method of manufacturing the same.

First, the security sheet according to one aspect of the present invention includes fibers that are spinnable or formed into a film to include a solvent-dyed dye or pigment, or a fluorescent dye or pigment, The fiber is prepared by cutting the fiber to a predetermined length and added to the cotton fiber, and the added fiber is added in an amount of 0.001 to 0.5 wt% with respect to the cotton fiber.

The security sheet can be used for the manufacture of securities, including securities, vouchers, or banknotes (banknotes, etc.), or security products, including passports, certificates or certificates.

According to another aspect of the present invention, there is provided a method of manufacturing a security sheet, comprising the steps of: spinning the sheet to include a solvent-dyed dye or pigment, or a fluorescent dye or pigment to produce a fiber or a fiber in a film form; And cutting the fiber to a predetermined length and adding it to the cotton fiber, and adding the fiber made to 0.001 to 0.5% by weight to the cotton fiber to prepare a paper.

If the prepared fiber is smaller than 70 denier, it is cut into a predetermined length of 3 to 5 mm and added to the fiber. Otherwise, if the prepared fiber is 70 denier or more, the fiber is cut in a direction perpendicular to the length Shaped or short fiber shape within 2 mm and added to the cotton fiber.

The produced fiber includes acrylic fiber dissolved in a specific solvent, artificial or regenerated protein fiber dissolved in an alkali solution, chitosan or cellulose fiber dissolved in an acidic solution, or resin fiber hydrolyzed in a bleaching agent.

The fiber thus prepared includes a fiber melter for chemical discoloration in response to a specific solvent, an alkali solution, an acidic solution, or a bleaching agent on the surface of nylon or polyvinyl resin fiber.

The paper to which the acrylic fiber has been added is contacted with acetone, alcohol, or toluene to develop hue or fluorescence in UV (Ultra Violet), or the paper to which chitosan or cellulose fibers have been added is diluted with diluted sulfuric acid The color of the paper may be brought into contact with caustic soda or the color of the paper may be exposed to UV (Ultra Violet) Or the paper to which the resin-based fiber is added may be brought into contact with sodium hypochlorite to develop hue or fluorescence in UV (Ultra Violet).

The solvent discoloration dyes and pigments include solvent yellow 82, solvent red 122, solvent blue 70, solvent black 27, Security indicator APX, or Chloroguard GG liq. The fluorescent dyes and pigments include lumogen F Yellow 083 (BASF), or Lumogen F Red 305 (BASF).

According to the security sheet and the method of manufacturing the same according to the present invention, a check, a gift certificate, or a banknote (banknote or the like) is included so that a color mark expressing a discoloration function of a specific color in response to a solvent, an acid, an alkali, Or a security product including a passport, a certificate, or a certificate, thereby enhancing the anti-counterfeiting effect.

1 is a flowchart illustrating a process for manufacturing a security sheet according to an exemplary embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the like elements throughout.

In security paper, chemical fading as a security element or security function is divided into solvent discoloration, acid or alkali discoloration, bleach discoloration. In general, solvent discoloration, acid or alkali discoloration, and bleach discoloration dyes are used in the manufacture of discoloration papers. The solvent discoloration dyes include solvent yellow 82 as a yellow dye, solvent red 122 as a red dye, solvent blue 70 as a blue dye and solvent black 27 as a black dye. The acid or alkali discoloration dyes are Security indicator APX and bleach dyes are Chloroguard GG liq. The above-described chemical dyes are generally mixed with the surface treatment agent during the papermaking process or they are added to raw materials such as fibers during the papermaking process. However, such discoloration dyes are largely lost due to dehydration in the papermaking process, and a trace amount is introduced due to the characteristic of being a colored dye. If the content exceeds the proper amount, discoloration dye color is expressed on the paper, Management has a very difficult problem. In addition, there are lumps in the paper which are not dispersed in the paper, which causes a defect product to be generated.

In order to solve these problems, acrylic fiber, which is dissolved in a special solvent instead of nylon fiber, which is generally used as security coloring, regenerated protein fiber dissolved in alkali, drug made of chitosan fiber / cellulosic fiber soluble in weak acid or acid A security element made of a bleach-resistant discoloration-type fiber, or a polyvinyl-based fiber, such as a solvent, an acid, an alkali, a bleach, etc., Or a security product including a banknote (banknote, etc.), or a security product including a passport, a certificate, or a certificate, so as to enable effective anti-counterfeiting.

The type of security shade to be described in the present invention is a color shade having a size of a few millimeters in length which is composed of an acrylic fiber having a solvent discoloring function, a regenerated protein-based shade having an alkaline discoloring function, a chitosan- or cellulose- , Bleaching coloring for bleaching reaction in response to a bleaching agent, etc., and a manufacturing method thereof and a method of applying the same to a security paper will be described.

In general, solvent-dyed pigments such as Solvent Blue, which are used in security paper, are used in the surface treatment process during the production of security paper (for example, after the paper is made, 1% by weight, or by adding about 0.1% to the papermaking stock. However, since such a solvent-discolorable dye is a dye having a specific color, considering the latest trends of security paper to which an off-white color is applied, the added amount is generally not higher than 0.01% of the blue, yellow and red dye It can be fatal to the color management of the paper. In addition, due to the inherent characteristics of the process for producing paper, a large amount of paper is lost by dewatering with water in the paper. Therefore, in order to improve this point, we tried to develop a security shade with solvent dyes.

When the chemical discoloration type fibers as described above are made of short fibers and a small amount is contained in the paper, it is possible to identify the authenticity of the paper with a specific solvent, and it is difficult to control the color when applying the conventional discoloration color pigment, , It is possible to solve the problem of color appearing on the paper when a very small amount of a certain amount is exceeded. Such a solvent discoloration type fiber can be used for a security such as a check, a gift certificate or a banknote , A certificate, or a security product that contains a certificate, or any other special product.

Hereinafter, the manufacture of security coloring of the drug discoloring function according to the present invention and a method of applying the security coloring to the security paper will be described in detail.

The drug discoloration type security shade (or fiber) according to the present invention can be applied to a textile such as acrylic, artificial / regenerated protein, chitosan / cellulose fiber and bleach discoloration fiber excellent in solvent, alkali / acid or bleaching agent solubility Among the spinning processes, solvents / dyes / pigments for solvent discoloration such as solvent yellow 82, solvent red 122, solvent blue 70 and solvent black 27, acid / alkali discoloration dyes / pigments such as Security indicator APX, bleach dyes / pigments such as Chloroguard GG liq, The pigments are mixed with fluorescent pigments or fluorescent dyes of various properties, such as lumogen F Yellow 083 (BASF) and Lumogen F Red 305 (BASF), to produce drug discolorable security fibers.

Here, acrylic fibers such as modacrylic fibers having a weight ratio of acrylonitrile (vinyl monomer) of 35 to 5% or less have a characteristic of being easily dissolved in a solvent such as acetone, and have a transparent shape and are colored with various color dyes or pigments. Reproducibility is excellent. Recycled protein fibers and chitosan / cellulosic fibers are easily soluble in alkaline and weak acids, respectively, and are excellent in color reproducibility by dyes or pigments of various colors. When the resin-based chip which is easily hydrolyzed in the oxidation / reduction reaction of the bleaching agent is melted to regenerate the fiber, the regenerated fiber (bleaching agent discoloration fiber) is easily eluted by the bleaching agent.

The above-mentioned solvent discoloration dyes or fluorescent pigments or dyes having a hue in the visible region can reproduce the hue of acrylic fibers such as modacrylic systems and are transparent or opaque in the visible region but exhibit a certain color in the ultraviolet region .

Here, the fibers and the discoloring pigment are dissolved by a solvent such as acetone according to the solvent-discoloring pigment added to the modacrylic or acrylic fiber, and a specific color can be expressed. Further, the main raw material of the fibers having the characteristics of being dissolved and eluted in such a solvent may be composed of copolymerized polyester, polystyrene, polyethylene or the like, preferably a copolymer polyester having excellent solubility in an alkali solvent. As the copolymerized polyester, polyethylene terephthalate, which is a main component, may be copolymerized with polyethylene glycol, a polypropylene glycol-containing ester unit, or a mixture thereof, but is not limited thereto.

≪ Security Shooting of Solvent Color Fading Function / Paper Manufacturing Method >

Referring to FIG. 1, a method for producing such a modacrylic or acrylic fiber comprises adding 0.1 to less than 1% by weight of fluorescence to an addition polymer obtained by polymerizing a vinyl monomer (such as acrylonitrile) having a weight ratio of 35 to 95% Dye or pigment or 0.1 to 1% by weight of a solvent-reactive drug-discoloring pigment or dye is mixed and spun to produce a fiber form (see S10 of FIG. 1). For example, if the fabric is less than 70 denier, for example, the fibers within 5-70 denier are cut to a predetermined length within 3 ~ 5 mm and applied to security paper with security stamp (S20, S30), fibers having a denier of 70 denier or more are cut in a direction perpendicular to the length, and are formed in a plate shape or a split short fiber shape of 2 mm or less in thickness and applied in the form of a planchette in the manufacture of security paper (refer to S40 in FIG. 1 ) Fluorescent light emission and solvent discoloration can identify the authenticity. In this case, the input amount of the security shade in the paper manufacturing is suitably 0.001-0.5% of cotton pulp weight.

In addition, in the application technology of the solvent discoloring fiber as described above, the melted material mixed with the dye / pigment for the solvent discoloration and the fluorescent dye / pigment is produced in the form of film in addition to the form of spinning fiber, It can also be applied to security paper in the form of flanchech by punching. The fiber having a fiber diameter of 5-70 denier is cut to a predetermined length of 3-5 mm as described above, and is applied to a security paper as a security shade. A fiber having a fiber diameter of 70 denier or more is cut in a direction perpendicular to the length, Or in the form of short fibers. In the production of security paper, it can be applied in the form of a flochet to identify the authenticity by fluorescence emission and solvent discoloration. In this case, the input amount of security color is 0.001 ~ 0.5% . Hereinafter, the same applies to other forms of security shade manufacturing method and the manufacture of security paper.

≪ Security shade of function of acid or alkali discoloration / method of producing paper >

On the other hand, the security color of the acid or alkali discoloration function is a color of the acid / alkali reaction type in the process of producing the chitosan or cellulose fiber which is easily dissolved in weak acid or acid, Pigments or dyes are mixed with 0.1 to 1% by weight of fluorescent pigments or fluorescent dyes of a single kind or various characteristics, and the mixture is dispersed and prepared into a fiber form. Hereinafter, the method of inputting to the security sheet and the method of using it as the security element are the same as those described in the security shading method of the solvent discoloring function. That is, the fibers having a fiber size of 5-70 deniers are cut to a predetermined length of 3 to 5 mm, and are applied to a security paper with a security shade, fibers having a diameter of 70 denier or more are cut in a direction perpendicular to the length, And it can be applied in the form of a planchette in the production of security paper to identify the authenticity by fluorescence emission and solvent discoloration. In this case, the input amount of the security color tone in the manufacture of the paper is in the range of cotton pulp weight 0.001 to 0.5% is suitable.

≪ Security coloring of bleach color change function / method of producing paper >

In addition, the security color of the bleach color change function is obtained by melting a resin-based chip which is easily hydrolyzed in the oxidation / reduction reaction of the bleaching agent, adding the bleach reaction-type drug coloring pigment or dye alone or the above-mentioned fluorescent pigment or fluorescent dye 1% by weight, and spinning it to produce a fiber form. Hereinafter, the method of inputting to the security sheet and the method of using it as the security element are the same as those described in the security shading method of the solvent discoloring function. That is, the fibers having a fiber size of 5-70 deniers are cut to a predetermined length of 3 to 5 mm, and are applied to a security paper with a security shade, fibers having a diameter of 70 denier or more are cut in a direction perpendicular to the length, And it can be applied in the form of a planchette in the production of security paper to identify the authenticity by fluorescence emission and solvent discoloration. In this case, the input amount of the security color tone in the manufacture of the paper is in the range of cotton pulp weight 0.001 to 0.5% is suitable.

≪ Method for Producing Security Color Shade with Surface of Fiber Melt >

Further, each of the above-described drug discoloration type security chromatic aberration (or fiber) which is discolored by a solvent, an alkali / acid, or a bleaching agent can be applied to nylon or polyvinyl resin fiber by using a fiber melter (solvent, Or a bleaching agent). In addition, a melt for producing nylon or polyvinyl fiber and a fiber melt for drug discoloration are passed through the respective nozzles for forming fibers in two layers in a separate melting tank, and a fiber melt for fiber discoloration The fibers may be produced so as to be radiated in a form in which a sieve is formed.

≪ Example 1 - Solvent discoloring type >

To prepare the solvent-discolorable fiber, a polymer having about 35-95% by weight of acrylonitrile and about 5-12% by weight of methyl methacrylate is dissolved in a solvent such as a thiocyanate aqueous solution or dilute nitric acid, and then a solvent red 122 dye Was added thereto in an amount of 1% by weight, heated and mixed, and melt-spun to obtain 50 kg of a master chip composed of an acrylonitrile polymer. The mixture was mixed with 500 kg of natural polyvinyl chloride chips at 70 to 120 ° C in a mixer, and the mixture was melt-spun into a compressor to produce fibers having a fiber diameter of about 30 μm (about 9 denier). The solvent-discolorable fibers prepared in this way were cut to a length of 3 to 5 mm and added to the cotton fiber at 0.002 wt% to prepare a paper. When acetone or alcohol is brought into contact with the paper thus prepared, a solvent-discolored fiber contained in a small amount of paper is melted, and a red dye contained in the fiber is developed to act as a confirmation factor of the paper.

≪ Example 2 - Solvent discoloring type >

500 kg of a natural polyvinyl chloride melt and 50 kg of an acrylonitrile melt were separately prepared in order to prepare a solvent-discolorable fiber. In the same manner as in Example 1, the acrylonitrile melt contained about 35-95% by weight of acrylonitrile, A polymer having about 5 to 12% by weight of the acrylate is dissolved in a solvent such as a thiocyanate aqueous solution or a dilute nitric acid, and then the solvent red 122 dye is added in an amount of 1% by weight and the mixture is heated to prepare a melt of an acrylonitrile polymer. The two solutions were put into separate compressors and melt spun using special nozzles so that the polyvinyl chloride melt (90 to 95% by weight) was coated on the acrylonitrile polymer (5 to 10% by weight) (About 9 denier). The method of applying to the security paper was the same as that of the first embodiment.

≪ Example 3 - Solvent discoloration type >

In order to produce a solvent-discolorable fiber, a co-polyester which is polyethylene terephthalate as a main component was melted to prepare a melt, and a fluorescent dye solvent blue 70 and a fluorescent dye Lumogen F Red 305 (BASF, perylene) To prepare a separate spinning solution. These spinning solutions were melt-spun to produce filaments, stretched at a draw ratio of 2.5, and then cut into a fiber having a diameter of 9 denier and a length of 2 mm or less to produce two types of solvent-discolorable fibers in a staple form. The solvent-discolorable fibers prepared by the above method were cut to a length of 3 to 5 mm and added to the cotton fibers at 0.002 wt% to prepare a paper. When the paper thus prepared is contacted with acetone or alcohol or toluene, the solvent-discolored fiber contained in a small amount in the paper is melted, so that the blue or red dye contained in the fiber is developed and fluorescence is generated in the UV (Ultra Violet) As the authenticity verification element of

<Example 4-Acid discoloring type>

To prepare acid-discolorable fibers, 10 to 50% by weight of an amino acid water-soluble protein consisting of casein or gelatin, which is a main component, was added with Security indicator APX dye and LUMILUX Green fluorescent dye LUMILUX Green of Hoeneyll Co. in an amount of 0.1% to 50 to 90% by weight of polyvinyl alcohol To prepare a melt. This was spun through a crosslinking bath containing 0.001% glucoaldehyde or 1% boric acid or borax to produce an acid-discolorable fiber. The acid discolorable fibers prepared by the above method were cut to a length of 3 to 5 mm and added to the cotton fiber at 0.002 wt% to prepare a paper. When it is contacted with dilute sulfuric acid on the paper thus produced, a small amount of acid-discolorable fiber contained in the paper melts to develop a bright line pink contained in the fiber and a green fluorescence in UV light, .

&Lt; Example 5 - Alkali discoloration type >

In order to produce alkali-discolorable fibers, wood, cotton pulp or waste materials containing a large amount of cellulose as a main component are dissolved in NMMO (N-methyl morpholine-N-oxide) solution at a concentration of 4-17% indicator APX dye and 0.1% LUMILUX Red RGS fluorescent dye of Hoeneyll Inc. were added to prepare a melt. And an alkali discolorable fiber of 3 to 5 mm was prepared by electrospinning it. In order to produce the security paper with the alkali discolorable fiber prepared by the above-mentioned method, 0.002 wt% of the alkali fiber was added to the cotton fiber to prepare the paper. When the paper thus prepared is brought into contact with caustic soda, a small amount of alkali discolorable fibers contained in the paper is melted to produce a bright ray of pink contained in the fiber. In addition, the fluorescent dye eluted together causes red fluorescence from UV light, It can be used as an authenticity verification factor of.

&Lt; Example 6: Bleach coloring type &

In order to prepare bleach-discolorable fibers, 50 to 90% by weight or more of a resin-based chip which is easily hydrolyzed in the oxidation / reduction reaction of a bleaching agent is melted and Chloroguard GG liq dye as a bleaching agent discoloration dye and LUMILUX Green Was added thereto to prepare a melt. Which was then electrospun to produce bleach discolorable fibers of 3 to 5 mm. In order to prepare a security paper with the bleach-discoloring type fiber produced by the above-mentioned method, 0.002% by weight of the fiber was added to the cotton fiber to prepare a paper. When this paper is contacted with sodium hypochlorite, bleached discolored fibers contained in the paper in a small amount and Chloroguard GG liq dye contained in the fibers are melted and the color of the brown color is developed to serve as a confirmation factor of the paper. In addition, it was confirmed that the fluorescent dyes eluted together can emit green fluorescence in UV light and can be used as a confirmation factor of the authenticity of the paper.

While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. This is possible. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined by the equivalents of the claims, as well as the claims.

Claims (12)

A paper produced by spinning to include a solvent-discoloring dye or pigment, or a fluorescent dye or pigment, or a fiber produced in the form of a film, wherein the fiber is cut to a predetermined length and added to the cotton fiber in an amount of 0.001-0.5 wt% ,
The fiber produced to be smaller than 70 denier is cut to a predetermined length of 3 to 5 mm or less and added to the cotton fiber or the fiber made to be 70 denier or more is cut in a direction perpendicular to the length to form a plate- Is added to the cotton fiber,
The fiber produced is a fiber-
An acrylic fiber dissolved in a specific solvent, a synthetic or regenerated protein fiber dissolved in an alkali solution, a chitosan or cellulose fiber dissolved in an acidic solution, a resin fiber hydrolyzed in a bleaching agent, or
A fiber melter for chemical discoloration responsive to a specific solvent, alkali solution, acidic solution, or bleaching agent is formed on the surface of nylon or polyvinyl resin fiber,
Characterized in that a specific solution is brought into contact with the paper to develop color or to emit fluorescence in UV (Ultra Violet). The method according to claim 1,
Wherein the security sheet is used in a security product including a check, a gift certificate, or a security including a banknote, or a passport, a certificate, or a certificate. Spinning to include solvent-dyed dyes or pigments, or fluorescent dyes or pigments to produce fibers or to produce fibers in film form; And
And cutting the fiber to a predetermined length and adding it to the cotton fiber, wherein the fiber is made by adding 0.001-0.5 wt% of the fiber to the cotton fiber,
The step of fabricating the paper may include cutting the fiber into a predetermined length of 3 to 5 mm and adding it to the cotton fiber if the fiber is less than 70 denier or cutting it in a direction perpendicular to the length if the fiber is 70 denier or more Forming a sheet-like or short-fiber shape within 2 mm and adding to the cotton fiber,
The fiber produced is a fiber-
An acrylic fiber dissolved in a specific solvent, a synthetic or regenerated protein fiber dissolved in an alkali solution, a chitosan or cellulose fiber dissolved in an acidic solution, a resin fiber hydrolyzed in a bleaching agent, or
A fiber melter for chemical discoloration responsive to a specific solvent, alkali solution, acidic solution, or bleaching agent is formed on the surface of nylon or polyvinyl resin fiber,
Characterized in that a specific solution is brought into contact with the paper to develop hue or fluorescence in UV (Ultra Violet). delete delete delete The method of claim 3,
Wherein the paper in which the acrylic fiber is added is contacted with acetone, alcohol, or toluene to develop hue or to express fluorescence in UV (Ultra Violet). The method of claim 3,
Wherein the paper in which chitosan-based or cellulose-based fibers are added is contacted with dilute sulfuric acid to develop hue or to express fluorescence in UV (Ultra Violet). The method of claim 3,
Characterized in that the paper to which the artificial or regenerated protein fiber is added is contacted with caustic soda to develop hue or to express fluorescence in UV (Ultra Violet). The method of claim 3,
Wherein the paper to which the resin-based fiber is added is brought into contact with sodium hypochlorite to develop hue or fluorescence in UV (Ultra Violet). The method of claim 3,
Wherein the solvent discoloration dye or pigment comprises solvent yellow 82, solvent red 122, solvent blue 70, solvent black 27, Security indicator APX, or Chloroguard GG liq. The method of claim 3,
Wherein the fluorescent dye or pigment comprises lumogen F Yellow 083 (BASF), or Lumogen F Red 305 (BASF).

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