KR102126676B1 - Security printing papaer for interfering reproduction by duplication using specular reflection of copier light source and method for manufacturing the same - Google Patents

Abstract

The present invention relates to a security printing paper for interfering duplication using specular reflection of a copier light source and a method of manufacturing the same. According to the present invention, the method of manufacturing the security printing paper for interfering duplication comprises: a first step of supplying raw paper in a roll shape; a second step of spreading a water color white ink on one surface of a the raw paper, drying by using hot air, and forming a water color white ink layer; a third step of reversing the water color white ink layer, spreading a UV-hardened medium on the other surface of the water color white ink layer, and forming a UV-hardened medium layer; a fourth step of attaching a high-gloss foil to one surface of the UV-hardened medium layer, removing a PET layer and a release layer, performing a UV-hardening treatment, and forming a high-gloss foil layer with the PET layer and the release layer removed; a fifth step of spreading a UV-hardened non-gloss primer on one surface of the high-gloss foil layer with the PET layer and the release layer removed, performing the UV-hardened treatment, and forming a UV-hardened non-gloss primer layer; and a sixth step of forming a letter or a QR code on one surface of the UV-hardened non-gloss primer layer, performing the UV-hardening treatment, and manufacturing a security printing paper for interfering duplication. According to the present invention, provided are the security printing paper for interfering duplication using specular reflection of the copier light source and the method of manufacturing the same, which are able to have a security and to be not deformed even by a high-temperature treatment at the same time.

Description

Security printing papaer for interfering reproduction by duplication using specular reflection of copier light source and method for manufacturing the same}

The present invention relates to a radiation-preventing security paper using specular reflection of a copier light source and a method for manufacturing the same, and more specifically, by copying a printed or printed text or QR code on the radiation-preventing security paper by a copier light source. As the anti-reflective security paper is reproduced in black as a regular reflection appears, it is easy to distinguish the original from the copy and at the same time, it relates to a radiation-resistant paper that does not deform even at high temperature treatment and a method of manufacturing the same.

In recent years, with the development of office automation devices, problems that are used in various crimes continue to occur by forgery and forgery of security products and security documents using an output machine.

So far, radiation-prevention technology has been devised to prevent latent images using large dots and small dots, full and half dots, and angle conversion methods.

However, in the case of special printing, forgery can be made simply difficult, but it cannot be prevented fundamentally. This is because counterfeit technology by professional counterfeit organizations develops along with the rapid development of printing machines. In this way, the problem can be solved if there is a method that makes it easy for anyone to discriminate whether or not counterfeiting is taking place, considering that counterfeiting is being carried out aiming at the lack of knowledge or attention to easily identify the authenticity of the general public. .

In addition, in the past, there is a case in which information is recorded on a copy-protective film and then attached to the surface of a document so that it cannot be copied by a copier. However, when this type of copy-protective film is pasted on a document, it is difficult to check the record of the original information. There were difficult drawbacks.

In order to reinforce these drawbacks, in the manufacturing process of the security paper for copy protection of Korean Patent Publication No. 10-2013-0072611, after the resin layer, the metal deposition layer and the protective layer are sequentially formed on the base paper, a mat layer is formed on the back surface to prevent radiation. Although it has disclosed a security paper for use, solvent-based nitrocellulose resins (MP-45) and polyurethane resins (NPA-) used in radiation-resistant security papers have been produced by the internal temperature of 250-350°C when copying recently developed copiers. 6500), the surface of the security paper for radiation interference at high temperature (250~300℃) is deformed and the problem of quality defects in which the glossiness (60°) measurement value falls from 350GU to 100GU or less.

1. Republic of Korea Patent Publication No. 10-2013-0072611'security paper for copy protection and its manufacturing method' 2. Republic of Korea Registered Patent Publication No. 10-1815638'Sticker label for radiation interference and its manufacturing method' 3. Korean Registered Patent Publication No. 10-2040477'Method for manufacturing functional roll sticker label with added security and sticker label manufactured thereby'

The object of the present invention is to use the UV-curable resin having a high melting point (melting point: 300°C or higher) instead of using the solvent-based resin previously used to solve the above problems, and coating a UV-curable media on the circle. After this, if the UV-curing treatment is performed while removing the release paper while laminating the high-gloss foil, the surface gloss of the radiation-resistant security paper is manufactured from 600 to 750GU, and the UV-curing matte primer is applied to the surface of the security paper By using the point where the glossiness is lowered from 280 to 360 GU, it is possible to solve the problem of deforming the surface of the security paper even at high temperatures (250 to 300°C), while improving the readability and handwriting of information on the top surface of the radiation-resistant security paper. It is to provide a copy-proof security paper and a method of manufacturing the copy-proof security paper that can easily distinguish the original and the copy, as specular reflection is caused by the light source of the copier when copying and the copy-protected security paper is reproduced in black.

Radiation-proof security paper using specular reflection of the inventor's copier light source, the first step of supplying the roll-form base paper 100, applying an aqueous white ink on one surface of the base paper 100 and then hot-air drying the chief white ink layer In the second step of forming 200, after inverting the aqueous white ink layer 200, UV curing type media is applied to the other surface of the aqueous white ink layer 20 to form a UV curing type media layer 300. Step 3, after attaching a high-gloss foil 400 to one surface of the UV-curable media layer 300, and then removing the PET layer and the release layer, UV curing treatment to remove the PET film layer and the release layer from the high-gloss foil layer In the fourth step of forming 410, the UV film-type matte primer is applied to one surface of the high-gloss foil layer 410 from which the PET film layer and release layer are removed, followed by UV curing to obtain a UV-curable matte primer layer 500. A fifth step of forming, and a sixth step of forming a text or QR code 600 on one surface of the UV-curable matte primer layer 500, followed by UV curing to prepare a security paper having security It is characteristic.

In addition, the aqueous white ink of the second step, calcium carbonate 15 to 20% by weight, anionic water-dispersible urethane resin 25 to 30% by weight, water 35 to 40% by weight, IPA 5 to 10% by weight, antifoaming agent 0.5 to 1 It is characterized by consisting of 5% by weight, 2-5% by weight of water-soluble wax, 10-15% by weight of amine, and 1-5% by weight of glycol.

In addition, the UV curing type of the third step, 1,6-hexanediol diacrylic acid 7 to 12% by weight, trimethylolpropane triacrylic acid 15 to 20% by weight, tripropylene glycol diacrylic acid 18 to 24% by weight %, isopropyl alcohol 4~9% by weight, mixed photoinitiator 5~10% by weight, and mixed acrylate oligomer 45~51% by weight.

In addition, the high-gloss foil 400 of the fourth step is characterized by comprising a release layer, a resin layer, an aluminum deposition layer, and a yellow resin layer laminated on one surface of the PET film layer.

In addition, the UV-curable matte primer of the fifth step, 5 to 10% by weight of calcium carbonate, 8 to 12% by weight of 1,6-hexanediol diacrylic acid, 8 to 12% by weight of trimethylolpropane triacrylic acid, It is characterized by consisting of 8 to 12% by weight of tripropylene glycol diacrylic acid, 2 to 5% by weight of isopropyl alcohol, 5 to 10% by weight of a mixed photoinitiator, and 40 to 50% by weight of a mixed acrylate oligomer.

Another embodiment of the present invention is characterized in that the radiation-preventing security paper using specular reflection of the copier light source is manufactured by the above-described manufacturing method and has security, and is not deformed even in high-temperature processing.

The present invention provides an organic combination configuration from the step of supplying the base paper to the step of producing the product for protecting the radiation-protective material, and thus the product of the radiation-protecting paper can be manufactured in one single process, thereby lowering the manufacturing cost. It can simplify the manufacturing process and improve the quality of the product.

In addition, since the contents of the original are not copied, the copying security paper using the specular light of the copier light source developed in the present invention is clearly distinguished from the copy or the counterfeit pattern, and thus has the effect of fundamentally preventing illegal copying and counterfeit use. It can be used in various ways such as securities, security documents, payment verification, etc. In addition, radiation-protected security paper using specular reflection of the copier light source developed in the present invention is not deformed even at high temperatures, and has recently been developed with an internal temperature of 250 to 350℃. Copiers are expected to have high utilization value.

1 is a structural diagram analyzing the copier mechanism in order to focus on the present invention.
FIG. 2 is a step-by-step process diagram of a method for manufacturing a radiation-safe security paper using specular reflection of a copier light source according to an embodiment of the present invention.
Figure 3 is a cross-sectional view of the radiation protection security paper according to an embodiment of the present invention.
4 is a cross-sectional view of a high gloss foil according to an embodiment of the present invention.
5 is a state diagram showing a state in which the copy-safe security paper is copied from a copying machine according to an embodiment of the present invention.
6 is a state diagram that appears in black when copying or copying characters from a copying machine after printing or printing characters on the copy-protected security paper according to an embodiment of the present invention.
7 is a state diagram showing a black color when copying from a copying machine after applying the radiation blocking technology to the Q-code part of the payment proof according to an embodiment of the present invention.
8 is a state diagram of checking the information applied to the QR code at 45° with a smart phone app by printing the QR code after applying the copying prevention technology to the payment verification according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, and detailed descriptions of well-known functions and configurations that may unnecessarily obscure the subject matter of the present invention will be omitted.

The present invention relates to a radiation-preventing security paper using specular reflection of a copier light source and a manufacturing method thereof, which will be described in detail through examples.

The present invention is to develop a radiation-proof security paper product using specular reflection of a copier light source, and more specifically, as shown in FIG. 2, a paper source supply step (S10), an aqueous white ink layer forming step (S20), the UV-curing media layer forming step (S30) on the other surface of the aqueous white ink layer, a high-gloss foil layer forming step (S40) in which a PET layer and a release layer are removed on one surface of the UV-curing media layer (S40), and the PET layer and the release layer are removed Including a UV-curable matte primer layer forming step (S50) on one surface of the high-gloss foil layer, including a text or QR code on one surface of the UV-curable matte primer layer (S60) It is a great feature to manufacture a radiation-resistant security paper that has security and at the same time does not deform at a high temperature.

<Manufacturing process of radiation-prevention security paper using specular reflection of the inventor's light source>

1. First step: Roll-shaped base paper 100 supply step (S10)

In this step, the original paper, which is a basic paper for manufacturing the radiation-protecting security paper using the specular light source of the copier light source, is supplied.

At this time, as the base paper 100, any available base paper such as double-sided art paper, sticker spreading paper, heat-sensitive spreading paper can be used, and preferably, double-sided art paper (90g/m2) or diffusion paper (80g/m2) is used.

The base paper 100 is mounted in a machine-wound state and is supplied in a roll type so as to supply it through a rotating force, through which the base paper can be automatically supplied.

In addition, the base paper 100 is supplied in a horizontally arranged state such that one side of the base paper faces upward with respect to the horizontal surface in order to provide ease of performing the process in each of the following steps.

2. Step 2: Forming the aqueous white ink layer 200 on one side of the base paper 100 (S20)

In this step, the aqueous white ink is coated on one surface of the supplied base paper 100, followed by hot air drying to form the aqueous white ink layer 200.

To explain, when the UV-curable ink is used, a security paper pushing phenomenon occurs in the paper supply unit 50-j roller, and it is preferable to use an aqueous white ink that does not cause a pushing phenomenon.

In addition, after the water-based white ink is applied, it must be dried with hot air, which is a paper supply unit 50-j of the copier 50 when operating the present invention radiation-protecting security paper 700 in the existing copier mechanism shown in FIG. 1. This is because after inserting in ), the radiation-protected security paper has the effect of preventing curling (bending) due to high temperature (250 to 350°C) in the process of passing through the fixing part (50-k) during copying.

In other words, An aqueous white ink is applied to the supplied base paper 100 so that the entire base paper is printed (veda printing). At this time, the aqueous white ink is composed of calcium carbonate, anionic water-dispersible urethane resin, water, IPA, antifoaming agent, water-soluble wax, amine, glycol, which contains a large amount of adhesive components and has high temperature as tension is provided. When irradiated, a warping phenomenon occurs, and the product value as paper decreases.

Therefore, in this step, in order to dry some adhesive components without deformation of the paper and to control the tension, an aqueous white ink treatment must be followed by a hot air drying process, and through this process, the paper does not deform even in the high temperature generated in the later copying process. .

At this time, the hot air drying is characterized in that it is performed for 2 to 4 seconds under a hot air treatment of 60 to 80°C. When the temperature is less than 60°C or less than 2 seconds, moisture remains on the paper, and the high temperature copier is still operating. Curling phenomenon appears, and if it exceeds 80°C or exceeds 4 seconds, there is a problem in that curling phenomenon occurs in the hot air drying process.

In addition, as the applied Veda printing method, any one of gravure printing and flexographic printing may be used, but it is preferable to apply a flexographic printing method. The production cost of the silver printing plate is low, and even if the smoothness of the surface of the base paper is poor, it is possible to print, and it is possible to provide an advantage of controlling the driving speed.

The composition of the aqueous white ink is 15 to 20% by weight of calcium carbonate, 25 to 30% by weight of anionic water-dispersible urethane resin, 35 to 40% by weight of water, 5 to 10% by weight of IPA, 0.5 to 1% by weight of antifoaming agent, water-soluble wax It is preferable to be composed of 2 to 5% by weight, 10 to 15% by weight of amine, and 1 to 5% by weight of glycol.

This, when using the calcium carbonate in less than 15% by weight may cause a security paper slip phenomenon in the paper supply unit (50-j) roller, if the calcium carbonate exceeds 20% by weight, there is a problem of insufficient printability Because there is.

The anionic water-dispersible urethane resin is preferably used as a product of Hanyang Ink Co., Ltd., but is not limited thereto. When the content of the anionic water-dispersible urethane resin is less than 25% by weight, gelation occurs during ink production. There is a disadvantage in that printability is deteriorated, such as when the ink is not evenly coated on the printed matter due to the occurrence or lack of fluidity. In addition, when the content exceeds 30% by weight, the ink becomes thin during ink production, so color reproduction becomes poor and fluidity becomes too high, resulting in poor printability, such as not having an appropriate amount of ink (or pigment) coated on the print, and also drying speed. It is slow, and ink transfers to other papers, causing smearing, which is uneconomical.

The IPA (iso-propyl alcohol) is a solvent that is harmless to the human body and is characterized by having a lower boiling point than water and very small surface tension. Therefore, it is preferable to use IPA in combination to improve the drying speed and adhesion than using a water-only solvent. At this time, if the IPA content is less than 5% by weight, the drying speed becomes slow, or a problem of poor adhesion occurs. When it exceeds 10% by weight, the spreadability is reduced due to excessive surface tension.

The anti-foaming agent is to prevent the generation of bubbles, and when it is contained in less than 0.5% by weight, there is a high probability that bubbles are generated in the white ink, and when it exceeds 1% by weight, the adhesion of the white ink is deteriorated.

The water-soluble wax improves the slip and gloss properties of white ink and scratch resistance of printed materials, and when contained in less than 2% by weight, it is difficult to prevent scratches generated during the copying process and exceed 5% by weight. In this case, there is a fear that the repellency is poor and the thickness is thick.

The amine serves to dissolve the urethane resin well in water, and when it is contained in less than 10% by weight, the solubility of the urethane resin decreases, and when it exceeds 15% by weight, the synergistic effect according to the excess content of the amine It is difficult to expect, and the combination with other materials is not appropriate, so the white ink is less likely to spread.

The glycol provides a stabilization and freeze-prevention function of the white ink, and when it is contained in less than 1% by weight, the freeze-prevention function is not sufficiently provided, and when it exceeds 5% by weight, a synergistic effect according to the excess content of glycol is observed. It is difficult to expect, and the combination with other materials is not appropriate, so the white ink is less likely to spread.

The water is a solvent that dissolves and dilutes the anionic water-dispersible urethane resin to give proper fluidity and viscosity, and when it is contained in an amount of less than 35% by weight, it is not easy to dissolve, so it is not easy to print, 40% by weight If exceeded, the hot air drying must be processed for a long time due to the excessive moisture content, which may cause paper deformation.

3. Third step: UV curing medium layer 300 forming step (S30)

In this step, after inverting the base 100 formed on the aqueous white ink layer 200 from the top surface to the bottom surface, the UV curable media layer 300 is applied to the other surface of the aqueous white ink layer 20 by applying UV curing media. It is characterized by forming.

At this time, the UV curable media layer 300 is used to serve as an adhesive to form the following high gloss foil layer 410, and the UV curable media layer 300 coating solution composition is 1,6-hexanediol diacrylic acid 7-12% by weight, trimethylolpropane triacrylic acid 15-20% by weight, tripropylene glycol diacrylic acid 18-24% by weight, isopropyl alcohol 4-9% by weight, mixed photoinitiator 5-10% by weight, mixed acrylate It is characterized by consisting of 45 to 51% by weight oligomer.

Here, the 1,6-hexanediol diacrylic acid, trimethylolpropane triacrylic acid, tripropylene glycol diacrylic acid is a low molecular weight polyol compound containing a hydroxyl group having a molecular weight of 100 to 500 having two or more hydroxyl groups, ultraviolet light It is excellent in curing and can give a sturdy yet flexible coating after curing, and can guarantee transparency with no yellowing, and has good advantages in compatibility with solvents.

Accordingly, in this step, the three low molecular weight polyol compounds are mixed and used in order to use the low viscosity as described above, wherein the 1,6-hexanediol diacrylic acid is contained in less than 7% by weight or When the trimethylolpropane triacrylic acid is contained in less than 15% by weight or the tripropylene glycol diacrylic acid is contained in less than 18% by weight, the hydrophilic part is small, and the emulsification or dispersion stability is lowered, and the 1,6- If the hexanediol diacrylic acid is contained in excess of 12% by weight, the trimethylolpropane triacrylic acid is contained in excess of 20% by weight, or the tripropylene glycol diacrylic acid is contained in excess of 24% by weight, the viscosity is excessive. As it becomes high, this also causes a problem that the emulsification or dispersion stability is lowered.

The isopropyl alcohol is a non-reactive solvent used to give the coating layer constant physical properties. When it is contained in less than 4% by weight or in excess of 10% by weight, it is difficult to obtain constant physical properties due to an inconsistent evaporation rate. .

The mixed photoinitiator is a non-yellowing type, characterized by using two or more mixed photoinitiators by increasing the reactivity to various curing lamps by absorbing ultraviolet rays of a wide range of wavelengths and increasing the overall curing rate. It is composed of 2 or more of 1-hydroxycyclohexyl acetophenone, alpha, alpha-dimethyl-alpha-hydroxy acetophenone, and acrylated benzophenone, where the mixed photoinitiator is contained in less than 5% by weight. In addition, the curing effect is slow, and the adhesion effect decreases when laminating high-gloss foil due to a decrease in the reaction rate.When it is used in excess of 10% by weight, the initial reaction occurs a lot and the reactivity increases, but the unreacted initiator remains and acts as a plasticizer. When passing through the curing device, the surface of the art paper is hardened and there is a problem in that microcracks are generated in the high-gloss foil when passing through the transfer roller (embossing).

The mixed acrylate oligomer is characterized by using two or more mixed acrylate oligomers to increase hardness and increase adhesion and flexibility, di-pentaerythritol hexaacrylate, trimethylol propane triacrylate, Ethoxylated trimethylol propane is composed of two or more of acrylate ester, oligo triacrylate, 2-hydroxy propyl acrylate, and phenoxyethyl acrylate, wherein the mixed acrylate oligomer is 45 When contained in less than weight%, the hardness decreases, and when used in excess of 51% by weight, shrinkage occurs a lot and adhesion ability decreases.

When the UV-curing media layer 300 is formed, it is preferable to apply a coating method using an anilox roll cylinder 300 to 360 mesh so as to proceed to a continuous process.

4. Step 4: Forming a high gloss foil layer with the PET layer and release layer removed (S40)

In this step, after attaching a high-gloss foil 400 to one surface of the UV-curable media layer 300, and then removing the PET layer and the release layer, UV curing treatment to remove the PET layer and release layer, the high-gloss foil layer 410 It is characterized by forming.

In this case, the high gloss foil 400 used is characterized by laminating a release layer, a resin layer, an aluminum deposition layer, and a yellow resin layer on one surface of the PET film layer, as shown in FIG. 4.

To illustrate, the high gloss foil is, first, a mixture of toluene, acetone, and butylacetate mixed with a cellulose solvent to form a release layer on one surface of the PET film, and the solution of the solution is dissolved in a gravure printing method on the surface of the PET film. After coating, the solvent is evaporated to form a release layer of 0.1 to 0.2 μm.

At this time, the mixed solvent is a mixed solvent in which toluene, acetone, and butyl acetate are mixed in a ratio of 1 to 2: 1: 1 to 2, and the content of the cellulose resin is 1 to 3 weight of cellulose resin based on 100 parts by weight of the mixed solvent. It is preferred to add parts.

Then, in order to have the resin layer laminated on the release layer, a polymer resin having excellent printability is used, but polyvinyl pyrrolidone 1 is mixed with 100 parts by weight of a mixed solvent composed of methanol and methylcellulose in a ratio of 1 to 1 to 2 by volume. ~30 parts by weight, 5-30 parts by weight of silica in a container, coated at 500 to 600 rpm for 2 to 3 hours, the polymer resin solution obtained was coated on a release layer with a thickness of 1 to 2 μm and dried to form a resin layer.

Then, an aluminum deposition layer having a thickness of 250 to 300 mm 2 is laminated on the resin layer formed as described above using a vacuum evaporator to form an aluminum deposition layer.

Then, to stack the yellow resin layer over the aluminum deposition layer formed as described above, Dimethylformamide, methyl ethyl ketone, and toluene are mixed in a ratio of 1:1:1 to 2 parts by volume. 100 parts by weight of acrylic resin, 15 to 20 parts by weight of acrylic resin, 10 to 15 parts by weight of polyurethane resin, and 5 to 10 parts by weight of yellow dye. After adding and dissolving while stirring to prepare a yellow resin solution, it is coated on an aluminum deposition layer to form a yellow resin layer having a thickness of 1 to 2 μm, thereby preparing a high gloss foil 400.

When the high gloss foil 400 prepared as described above is laminated to the upper surface of the UV-curable media layer 300 formed in the third step, the yellow resin layer 400-e is attached, and the release layer 400-b After separating the PET film layer 400-a, the UV curable media layer is cured by passing through a UV curing device to form a high gloss foil layer 410 from which the PET layer and release paper layer are removed.

At this time, the reason for the UV curing treatment is that the UV light passes through the high gloss foil 400 and is cured in the attached state with the UV-curable media, thereby causing high temperature (250-350°C) at the fixing part (50-k) of the copier 50 This is because it plays a role in not being transformed.

In addition, it is preferable to apply 365 to 395 nm and 4.8 to 5 mm 2 /cm as curing conditions to prevent damage to the high gloss foil 400 due to excessive curing conditions during the curing treatment.

The ultraviolet curing treatment is characterized in that it is capable of instantaneous irradiation of high-intensity energy and radiates heat abundantly and evenly over the entire wavelength band.

5. 5th step: UV curing type matt primer layer forming step (S50)

In this step, the PET layer and the release layer are characterized by forming a UV-curable matte primer layer 500 by applying a UV-curable matte primer to one surface of the high-gloss foil layer 410, followed by UV curing.

In detail, as a result of measuring the glossiness of the surface of the high gloss foil layer 410, it was measured to be 700 GU or more. If the QR code or text is printed directly, the readability decreases. If the QR code is recognized at an angle of 45° with the smartphone app, the restoration effect is insufficient.

In order to solve this problem, it is necessary to form the UV-curable matte primer layer 500, which is the present step, before the QR code or text printing process to reduce the glossiness value from 270GU to 300GU to improve readability and recognition effect of the smartphone app. very important.

At this time, the coating liquid composition of the UV-curable matte primer layer 500 used is 5 to 10% by weight of calcium carbonate, 8 to 12% by weight of 1,6-hexanediol diacrylic acid, and 8 to 12 of trimethylolpropane triacrylic acid. It is preferable to be composed of 8% to 12% by weight of tripropylene glycol diacrylic acid, 2 to 5% by weight of isopropyl alcohol, 5 to 10% by weight of a mixed photoinitiator, and 40 to 50% by weight of a mixed acrylate oligomer.

At this time, when the calcium carbonate is used in an amount of less than 5% by weight, the glossiness (60°) value of the high gloss foil is 550GU, which can improve the readability and restoration effect of the smartphone app, and the calcium carbonate is 10% by weight or more. When used as a high gloss foil, the glossiness (60°) value is 190GU, which can improve readability and restore effect of the smartphone app, but there is a problem of insufficient radiation interference.

When the 1,6-hexanediol diacrylic acid is contained in an amount of less than 8% by weight, the hydrophilic portion is low, so the emulsifying property of the primer is poor, and when it is contained in an amount of more than 12% by weight, the viscosity is excessively high, resulting in poor spreadability. Occurs.

When the trimethylolpropane triacrylic acid is contained in an amount of less than 8% by weight, UV curability is lowered, and when it is contained in an amount of more than 12% by weight, yellowing may occur.

When the content of the tripropylene glycol diacrylic acid is less than 8% by weight, it is relatively less than the 1,6-hexanediol diacrylic acid or trimethylolpropane triacrylic content, thereby ensuring transparency. It is difficult, and when it contains more than 12% by weight, it becomes difficult to give a flexible coating film.

The isopropyl alcohol is a non-reactive solvent used to give the coating layer constant physical properties. When it is contained in less than 2% by weight or in excess of 5% by weight, the evaporation rate is not constant, making it difficult to obtain constant physical properties. .

The mixed photoinitiator is a non-yellowing type, characterized by using two or more mixed photoinitiators by increasing the reactivity to various curing lamps by absorbing ultraviolet rays of a wide range of wavelengths and increasing the overall curing rate, 1 -Hydroxycyclohexyl acetophenone, alpha, alpha-dimethyl-alpha-hydroxy acetophenone, composed of two or more of acrylate benzophenone, wherein the mixed photoinitiator is used in less than 5% by weight After coating the surface of the high-gloss foil 400 on the top surface of the base paper 100, a smearing phenomenon occurs in the transfer roller (embossing) when passing through the ultraviolet curing device, and when the mixed photoinitiator is used in an amount of 10 wt% or more, the base paper ( After coating the surface of the high gloss foil 400 on the top surface of 100), when the ultraviolet curing device passes, the surface of the high gloss foil is hardened and microcracks are generated when passing through the transfer roller (embossing).

The mixed acrylate oligomer is characterized by using two or more mixed acrylate oligomers to increase hardness and increase adhesion and flexibility, di-pentaerythritol hexaacrylate, oligo triacrylate, 2- It is composed by mixing two or more of hydroxy propyl acrylate and phenoxyethyl acrylate, wherein the mixed acrylate oligomer has a reduced hardness when contained in less than 40% by weight, and exceeds 50% by weight. When used, shrinkage occurs a lot and adhesion ability decreases.

In addition, in the step of forming the UV-curable primer layer 500, a coating method using an anilox roll cylinder 800-1000 mesh is applied to enable a continuous process. In order to prevent the high gloss foil from being damaged due to excessive curing conditions, it is preferable to apply 365 to 395 nm and 4.8 to 5 ㎾/cm as curing conditions.

6. Step 6: Manufacturing security paper with security (S60)

In this step, a character or QR code 600 is formed on one surface of the UV-curable matte primer layer 500, and then UV-cured to produce a security paper having the security shown in FIG. 3.

To explain, this step is a step of forming a text or QR code 600 on one surface of the UV-curable matte primer layer 500, followed by UV curing, and curing conditions of the UV curing device are the same as in the sixth step. .

The generated copying security sheet 700 is output to the printer as shown in FIG. 5, so it is output in black and cannot confirm the information in the original. As shown in FIG. 6, the copying security sheet 700 is printed on the printer. Even though the letters and numbers (700-a) are output, when copying from the copier, specular reflection occurs on the surface of the copier light source and security paper, so that the copy paper 710 is output in black and the information in the original cannot be checked. have.

In addition, using a flexo printing machine 8 degrees, apply a copy-disturb security sheet 700 to a part of the payment certificate as shown in FIG. 7, print the QR code 700-b on one side, and add a Thompson (sword mark) to the diagram. After manufacturing various payment certificates as in 7, when the copy is made from the copier, the specular light is generated on the surface of the copier light source and the copy-protected security sheet 700, and only the QR code application area (700-b) is output in black (710). And the copy can be visually identified, and the QR code 700-b in the original is a smartphone app, as shown in FIG. 8, and when viewing at 45°, the information 720 in the QR code is identified. .

The radiation-resistant security paper 700 in the roll state is produced by providing a finished product by interposing with a sheet to suit the characteristics of the product.

Hereinafter, examples and experimental examples will be described in more detail with respect to the present invention, but these examples and experimental examples are for illustrative purposes only and are not intended to limit the protection scope of the present invention.

<Example 1> Preparation of security paper 1 for radiation interference

After preparing a roll-sided double-sided art paper (90 g/m 2 ), cut and print an aqueous white ink on one side of the art paper with a flexographic printing method, and then dry it for 2 seconds with a hot air at about 60° C. 200).

At this time, the aqueous white ink is 20% by weight of calcium carbonate, 26% by weight of anionic water-dispersible urethane resin, 35% by weight of water, 5% by weight of IPA, 1% by weight of antifoaming agent, 2% by weight of water-soluble wax, 10% by weight of amine, glycol What consisted of 1% by weight was applied.

One side of the formed aqueous white ink layer 200 is inverted through a base inverter to provide a UV curable media with viscosity on the other side of the aqueous white ink layer 200 300-360 mesh (anilox roll cylinder) mesh) to form a UV-curable Medi layer 300, and place the yellow resin layer 400-e of the high-gloss foil 400 on the top surface to be laminated and attach through a compression roller, and then a PET film layer After removing the and release paper layer, UV curing was passed through a UV curing device to form a high gloss foil layer 410 from which the PET film layer and the release paper layer were removed.

At this time, the UV curable media is 1,6-hexanediol diacrylic acid 7% by weight, trimethylolpropane triacrylic acid 15% by weight, tripropylene glycol diacrylic acid 24% by weight, isopropyl alcohol 4% by weight, mixed photoinitiator A composition consisting of 5% by weight and 45% by weight of mixed acrylate oligomer was applied.

In addition, the high gloss foil is a release layer, a resin layer, an aluminum vapor deposition layer, and a yellow resin layer on one side of the PET film layer, so that the toluene, acetone, and butyl acetate are formed to form a release layer on one surface of the PET film. A 2:1:2 is mixed with cellulose resin in a mixed solvent of 3 parts by weight based on 100 parts by weight of the mixed solvent, and the dissolved solution is coated with a gravure printing method on the surface of the PET film, and then the solvent is evaporated from 0.1 to 0.2. A µm release layer was formed.

Then, in order to make the resin layer laminated on the release layer, a polymer resin having excellent printability is used, but polyvinyl pyrrolidone (100 parts by weight of a mixed solvent composed of 40 v/v% methanol and 60 v/v% methylcellulose) ( ISP, PVP K-90) 5 parts by weight of silica and 6.4 parts by weight of silica were placed in a container and mixed for 2 hours at 500 rpm to apply the polymer resin solution obtained over a release layer with a thickness of 1 to 2 μm and dried to form a resin layer. Did.

Then, an aluminum deposition layer having a thickness of 300 Å was laminated on the resin layer formed as described above using a vacuum evaporator to form an aluminum deposition layer, and then, to deposit a yellow resin layer over the aluminum deposition layer formed as above, 20 parts by weight of acrylic resin, 10 parts by weight of polyurethane resin, and 5 parts by weight of yellow dye are added to 100 parts by weight of a mixed solvent consisting of 25 v/v% of dimethylformamide, 25 v/v% of methyl ethyl ketone, and 50v/v% of toluene. After dissolving while stirring to prepare a yellow resin solution, it was coated on an aluminum deposition layer to form a yellow resin layer having a thickness of 1 to 2 μm, thereby preparing a high gloss foil.

In addition, as a result of measuring the glossiness (60°) of the high gloss foil layer 410 from which the PET film layer and release paper layer were removed, it was measured from 600GU to 750GU.

Thus, a UV curing type matte primer layer was applied on the high gloss foil layer from which the PET film layer and release paper layer were removed, and a UV curing type matte primer layer was applied by applying a coating method using an anilox roll cylinder 800-1000 mesh. Since it forms (500), the glossiness (60°) is reduced from 270GU to 380GU.

At this time. The UV curable matte primer is 10% by weight of calcium carbonate, 12% by weight of 1,6-hexanediol diacrylic acid, 12% by weight of trimethylolpropane triacrylic acid, 12% by weight of tripropylene glycol diacrylic acid, isopropyl alcohol 5 What consisted of weight%, mixed photoinitiator 9% by weight, and mixed acrylate oligomer 40% by weight was applied.

Next, a UV curing treatment was performed. At this time, 365 nm and 4.8 ㎾/cm were applied as curing conditions to prevent the high gloss foil from being damaged.

Then, after forming a character or QR code 600 on one surface of the UV-curable matte primer layer 500, security having security shown in FIG. 3 through UV curing treatment under 365 nm and 4.8 ㎾/cm conditions Paper was produced, and then the finished paper was interposed as a sheet on the sheet to produce a finished product.

<Comparative Example 1> Manufacture of security paper 2 for radiation interference

Prepared in the same manner as in Example 1, the aqueous white ink was cut and printed, and then dried for 5 seconds with hot air at about 50°C to prepare radiation-protected security paper 2.

<Comparative Example 2> Manufacture of security paper 3 for radiation interference

Prepared in the same manner as in Example 1, 11% by weight of calcium carbonate, 35% by weight of anionic water-dispersible urethane resin, Radiation-resistant security paper 3 was prepared by applying an aqueous white ink consisting of 35% by weight of water, 5% by weight of IPA, 1% by weight of antifoaming agent, 2% by weight of water-soluble wax, 10% by weight of amine, and 1% by weight of glycol.

<Comparative Example 3> Manufacture of security paper 4 for radiation interference

Prepared in the same manner as in Example 1, the UV-cured media 1,6-hexanediol diacrylic acid 7% by weight, trimethylolpropane triacrylic acid 15% by weight, tripropylene glycol diacrylic acid 18% by weight, iso A radiation-resistant security paper 4 was prepared by applying a UV-curable media composed of 2% by weight of propyl alcohol, 3% by weight of a mixed photoinitiator, and 55% by weight of a mixed acrylate oligomer.

<Experiment 1> Confirmation of security prints

1. Experimental method

The degree of detection of the security printout that appears during ultraviolet irradiation on the security paper of Example 1 was confirmed.

2. Experimental results

As shown in Figs. 5 and 6, the copier light source 50-b and the security paper are used to copy the printout from the copier 50 using the printer on the copy-protected security paper of Example 1 It was confirmed that the specular reflection occurred due to the gloss of the surface, so that the information in the original was reproduced in black on the copy.

In FIG. 7, after forming the UV-curable media layer 300 on the diffusion paper 100 in the flexographic printing machine as shown in FIG. 3 on a specific part of the payment certificate, a high-gloss foil 400 is formed thereon and the UV-curable type as shown in FIG. 7 After forming the primer layer 700, when copying the payment certificate with the QR code printed on the surface of the UV-curable primer layer 700 (700-b) from the copier 50, the copier light source 50-b and security paper It was confirmed that the specular reflection was generated by the gloss of the surface, and that the QR code in the manuscript was reproduced as the front black 710 in the copy.

In FIG. 8, after applying the radiation-blocking technology, the QR code is printed on the surface of the UV-curable primer layer 700 (700-b). The applied information 720 was confirmed.

Accordingly, it can be seen that in the case of the copy paper of Embodiment 1 of the present invention, the user can easily distinguish between the original and the copy, thereby preventing the illegal copying and counterfeit use.

<Experimental Example 2> Confirmation of heat resistance

1. Experimental method

The curling phenomenon of the security papers of Examples 1 and 1 to 4 was confirmed.

As a method of measuring heat resistance, three specimens of 2.5 cm × 15 cm were prepared for each of the security papers, and then attached to the outer wall of a 500 mL PE bottle. Then, it was stored in an oven at 250° C. for 10 minutes, and then left at room temperature for 3 days to qualitatively evaluate the state in which the specimens were attached to the outer wall. The target level was aimed at a state in which the attached sheet was in close contact with the PE wall surface without air tunnel or lifting phenomenon.

At this time, a 4-point measurement method was used as a measurement standard (4: no lifting and curling phenomenon and no air tunnel, 3: no lifting or curling phenomenon, but a slight air tunnel, 2: lifting, curling phenomenon weakly) And there is an air tunnel, 1: severely curled)

2. Experimental results

Example 1 Comparative Example 1 Comparative Example 2 Comparative Example 3 Heat resistance 4 One 2 3

As shown in Table 1, it was confirmed that in the case of the security paper of Example 1 of the present invention, it is excellent in heat resistance at room temperature, so that it can be commercialized as a security paper without deformation of the paper even at high temperature treatment.

On the other hand, in the case of the security papers of Comparative Examples 1 and 2, the heat resistance was low, and it was confirmed that the security paper showed a curling phenomenon in the high temperature (250°C) treatment, and in the case of Comparative Example 3, when the paper and the high-gloss foil layer were formed. According to the uncured phenomenon, it was confirmed that a high-gloss foil had a floating phenomenon.

As described above, it was found that the radiation-protected security paper provided by the present invention is a radiation-protected security paper that has security and does not deform even at high temperature processing.

The present invention has been described with reference to preferred embodiments and experimental examples, and those of ordinary skill in the art to which the present invention pertains have a different form from the detailed description of the present invention within the essential technical scope of the present invention. You will be able to implement examples. Here, the essential technical scope of the present invention is indicated in the claims, and all differences within the equivalent range should be interpreted as being included in the present invention.

50: Copier 50-a: Manuscript
50-b: Mirror 50-d: CCD
50-e: image processing unit 50-f: laser generation unit
50-g: Polygon mirror 50-h: Drum
50-i: Developer 50-j: Paper feeder
50-k: Fusing unit
100: roll paper
200: water-soluble white ink layer 300: UV curing medium layer
400: high gloss foil
400-a: Polyethylene terephthalate (PET)
400-b: release layer 400-c: resin layer
400-d: aluminum deposition layer 400-e: yellow resin layer
410: PET film layer and release layer removed high gloss foil layer
500: UV curable matte primer layer 600: Text or QR code
700: Copy protection paper 700-a: Printed text and numbers
700-b: QR code with information inserted 710: Copy
720: QR code restoration status using the app on the smartphone

Claims (6)

A first step of supplying a roll-shaped base paper 100;
A second step of forming a senior white ink layer 200 by hot-air drying after applying an aqueous white ink on one surface of the base paper 100;
A third step of inverting the aqueous white ink layer 200 and then applying a UV curable media on the other surface of the aqueous white ink layer 20 to form a UV curable media layer 300;
After attaching a high-gloss foil 400 to one surface of the UV-curable media layer 300, and then removing the PET film and release layer, UV curing treatment to form a high-gloss foil layer 410 from which the PET film and release layer is removed The fourth step;
A fifth step of forming a UV-curable matte primer layer 500 by applying a UV-curable matte primer to one surface of the high-gloss foil layer 410 from which the PET film and release layer have been removed, followed by UV curing;
After the text or QR code 600 is formed on one surface of the UV-curable matte primer layer 500, the UV curing treatment comprises a sixth step of manufacturing a security paper 700 having security,
Method for manufacturing radiation-protected security paper using specular reflection of copier light source.
According to claim 1,
The aqueous white ink of the second step is 15-20% by weight of calcium carbonate, 25-30% by weight of anionic water-dispersible urethane resin, 35-40% by weight of water, 5-10% by weight of IPA, 0.5-1% by weight of antifoaming agent , Water-soluble wax 2 to 5% by weight, amine 10 to 15% by weight, characterized in that consisting of glycols 1 to 5% by weight,
Method for manufacturing radiation-protected security paper using specular reflection of copier light source.
According to claim 1,
The UV curing type of the third step, 1,6-hexane diol diacrylic acid 7 to 12% by weight, trimethylolpropane triacrylic acid 15 to 20% by weight, tripropylene glycol diacrylic acid 18 to 24% by weight, Characterized by consisting of 4 to 9% by weight of isopropyl alcohol, 5 to 10% by weight of the mixed photoinitiator, and 45 to 51% by weight of the mixed acrylate oligomer,
Method for manufacturing radiation-protected security paper using specular reflection of copier light source.
According to claim 1,
The high-gloss foil 400 of the fourth step is characterized by being formed by laminating a release layer, a resin layer, an aluminum deposition layer, and a yellow resin layer on one surface of the PET film layer,
Method for manufacturing radiation-protected security paper using specular reflection of copier light source.
According to claim 1,
The UV curing type matte primer of the fifth step is 5-10% by weight of calcium carbonate, 8-12% by weight of 1,6-hexanediol diacrylic acid, 8-12% by weight of trimethylolpropane triacrylic acid, tripropylene Characterized in that it consists of 8 to 12% by weight of glycol diacrylic acid, 2 to 5% by weight of isopropyl alcohol, 5 to 10% by weight of a mixed photoinitiator, and 40 to 50% by weight of a mixed acrylate oligomer,
Method for manufacturing radiation-protected security paper using specular reflection of copier light source.
It is manufactured by the manufacturing method of any one of claims 1 to 5,
It is characterized by not being deformed even at high temperature treatment while having security.
Copy protection paper using specular reflection of copier light source.

Images