KR20180087893A - Security paper containing color watermark using thermochromic and photochromic effect and manufacturing method thereof - Google Patents

Abstract

The present invention provides security paper and a manufacturing method thereof, in which a shape of watermark is printed on base paper by using thermochromic or photochromic ink with or without a color and then lamination is performed to prevent a printed surface from being exposed, so that 1) a fine and colorful watermark appears, disappears, or changes whenever the watermark is exposed to one or more predetermined temperatures or predetermined lights; 2) the printing is performed by using various combinations of the thermochromic or photochromic ink to provide a stronger anti-forgery effect than when a material of a single property is used; 3) durability is improved because a material used for printing the watermark is located inside the paper; 4) production cost and time are reduced because no additional device is required to implement the shape of the watermark in a step of preparing the base paper; and 5) a manufacturing method according to the present invention can be applied to a predetermined region of the watermark which is press-printed when preparing the base paper. The manufacturing method includes the steps of providing a first base paper and a second base paper; printing a shape of watermark on one surface of the first base paper; and laminating the first base paper with the second base paper.

Description

TECHNICAL FIELD [0001] The present invention relates to a security paper including an ink and a method for manufacturing the same,

The present invention relates to a security paper including coloring and coloring utilizing a heat discoloration and photochromism effect, and a method of manufacturing the security paper. More particularly, the present invention relates to a security paper comprising a colorless or colored heat discoloration or photochromic ink The present invention also relates to a method of manufacturing the same, and a method of manufacturing the security sheet.

A watermark is one of the important security elements implemented in security paper for anti-counterfeiting effect of paper. Generally, due to the difference in thickness and density of paper or fiber, a portion where light is less transmitted is dark, The transmitted portion is made to appear bright so that the shape of the silver is changed or manifested by the name card difference. In such a method, there is an embossing method in which pressing is performed by pressing a specific portion with a press of the paper by pressing the paper after the drying, so that it is not visible in transmitted light, but is limited in security and durability because it is visible only in reflected light .

As a typical conventional method of implementing silver, a method of embodying the shape of silver in the stage of manufacturing the paper is performed, but it is difficult to elaborate and detailed expression, and there is a restriction that the color of silver is the same as the color of paper. In addition, when the shape of the silver is realized in the stage of producing the paper, additional devices such as a net hook, a dandy roll, and a press marking roll are required, and a separate process is required according to the implementation of silver, There are disadvantages. In the case of the Japanese banknote, it is required to be implemented at the stage of manufacturing the paper, though it is supplemented with the fineness which is the disadvantage of the existing silver by the press mark method instead of the watermark method. In addition, There is no big difference from the method. Korean Patent Registration No. 10-1213208 discloses a method of producing silver using a laser as another method of implementing silver.

With the development of printing technology, the designs of banknotes and currencies have become more detailed and brilliant, and the implementation of silverware has also become more demanding in terms of high security and fine and colorful design aspects. A thermochromic effect (or thermochromic effect) is a phenomenon in which a substance changes its color when it reaches a certain temperature. There is irreversible that does not return to the original color even when the temperature is lowered once it is discolored by heating, and there is also reversible return to original color. The photochromic effect (or photochromic effect) refers to a phenomenon in which the color changes due to ultraviolet rays of sunlight or ultraviolet rays or infrared rays generated by an electric generator. Korean Patent No. 10-0824286 discloses a technique related to a transfer paper using color fading characteristics.

If a variety of inks having the above-described discoloring properties can be used in combination to form a silver sheet of a security sheet, a detailed and colorful silver sheet can be realized, Effect can be obtained additionally. In other words, utilizing these effects, it is possible to provide security paper that realizes colored silver that can provide a high degree of security as well as a demand for finer and brilliant design, and can also be applied to fancy paper and the like.

KR 10-1213208. KR 10-0824286.

The present invention has been made to solve the problems of the prior art, and more specifically, it is an object of the present invention to provide a method of manufacturing a security paper by printing a silver pattern on a paper sheet using various colorless or colored heat- By performing lamination so as not to be exposed,

1) When exposed to a specific temperature or ultraviolet rays, fine or colorful silver is expressed or changed,

2) printing is performed by various combinations of heat discoloration or photochromic ink so as to achieve a far stronger anti-fake effect having various characteristics than when a single substance is used,

3) The durability is increased because the material used for silver printing is located inside the paper,

4) Since no additional device is needed to implement the shape of silver in the stage of manufacturing paper, it is possible to reduce production cost and production time,

(5) a method for manufacturing a paper according to the present invention,

And a method of manufacturing the same.

According to an aspect of the present invention, there is provided a method of manufacturing a semiconductor device, comprising: providing first and second raw paper sheets; Printing a silver pattern on one surface of the first sheet of paper; And a step of bonding and laminating one surface of the second raw paper with the surface of the first raw paper on which the silver pattern is printed so as not to expose the printed surface, wherein the silver color is a colorless or colored thermochromic ink and a colorless or colored Of photochromic inks, wherein the silver color changes color upon exposure to one or more specific temperatures or one or more specific lights.

The first raw paper or the second raw paper may be provided by pressing the silver shape.

The printing step may further include a step of multi-step printing the silver pattern, and at each end of the multi-step printing, printing may be performed using at least one of a thermochromic ink and a photochromic ink.

The secure paper manufacturing method may further include constraining and drying after the lapping step, and the constrained drying may be performed at a temperature at which discoloration of the thermochromic ink does not occur.

The ink may be in the form of a pigment or a dye and may be colored in white by heat or light, colored to white, or colored to other colored.

The thermochromic ink may include an ink having reversible or irreversible characteristics.

The ink may be a plate, an intaglio or an ink produced for screen printing purposes.

According to another aspect of the present invention, there is provided a printing apparatus including: a first paper source on which a silver pattern is printed on a first surface; And a second paper sheet adhered to the printed surface of the first paper sheet by a bonding means so as not to expose the print surface, wherein the silver paper sheet is a colorless or colored thermochromic ink and a colorless or colored Wherein at least one of the photochromic inks is printed using at least one of the inks, and the silver color changes color each time the silver color is exposed to one or more specific temperatures or one or more specific lights.

The silver halide mirror shape may be formed by pressing on the surface of the second paper sheet adhered to the first paper sheet, and the first raw paper sheet and the second original sheet may be laminated so that the silver shape and the mirror shape coincide with each other .

The silver sheet may be formed on one surface of the first paper sheet by being pressed, and the printing may be performed on the stamped silver sheet.

As described above, according to the present invention, by implementing coloring by utilizing thermal discoloration or photochromic effect, fine and colorful silver is expressed, disappears or changes upon exposure to one or more specific temperatures or specific lights or the like .

In addition, by performing printing by various combinations of heat discoloration or photochromic ink, it is possible to obtain a far stronger anti-fake effect having various characteristics than when a single-property substance is used.

In addition, since the material used for silver printing is located inside the paper, the durability is improved.

In addition, the manufacturing method according to the present invention can be applied to a specific region of silver which has been collapsed during the production of paper, and it is possible to reduce the production cost and production time .

In addition, it is possible to apply it to fancy paper because it has an extraordinary effect that gorgeous and fine silver appears and disappears.

FIG. 1 is a flowchart illustrating a method of manufacturing a security sheet including colored ink using a coloring and photochromic effect according to an exemplary embodiment of the present invention. Referring to FIG.
FIG. 2 is a cross-sectional view of a security sheet including colored ink using a coloring and photochromic effect according to an exemplary embodiment of the present invention. Referring to FIG.
FIG. 3 is a cross-sectional view of a security sheet including colored ink using the heat discoloration and photo-discoloring effect according to another embodiment of the present invention.
FIGS. 4 to 6 are schematic views illustrating a process of laminating according to an embodiment of the present invention and a process of expressing silver according to a change in temperature.
FIG. 7 is a process diagram schematically illustrating the process of laminating silver paper according to another embodiment of the present invention and the process of forming silver according to temperature change.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. In the following description, only parts necessary for understanding the operation according to the embodiment of the present invention are shown and described, and the other parts of the drawings and descriptions are omitted so as not to obscure the gist of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In addition, terms and words used in the following description and claims should not be construed to be limited to ordinary or dictionary meanings, but are to be construed in a manner consistent with the technical idea of the present invention As well as the concept.

Throughout the specification, when an element is referred to as "comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise.

For simplicity of explanation, one or more methods are shown and described herein as a series of steps, for example in the form of a flowchart or a flowchart, but the present invention is not limited by the order of the steps, As it can be done in a different order than that shown and described herein or concurrently with other steps. Furthermore, not all illustrated steps may have to be implemented in accordance with the present invention.

As described above, the present invention relates to a security paper used for securities, a passport, etc. for the purpose of prevention of forgery and falsification, and a security paper used for fancy paper having a novel function of silvering and disappearance. The security paper is required to exhibit fine or colorful silver when exposed to a specific temperature or ultraviolet rays, to exhibit a strong anti-forgery effect, to have high durability, to reduce production cost and production time, It shall be applicable to silver.

FIG. 1 is a flowchart (S10) illustrating a method of manufacturing a security sheet including colored ink using a thermal discoloration and photochromic effect according to an embodiment of the present invention. FIGS. 2 and 3 are views The color utilizing the heat discoloration and photochromic effect according to one embodiment and another embodiment is a sectional view (20, 30) of the security paper including the ink.

The steps of FIG. 1 will be described with reference to FIG. 2 and FIG.

Step S11 is a step of preparing the raw paper 21 and the second raw paper 22, 32, respectively.

First, pulp selected from at least one of cotton fiber, softwood bleached pulp, and hardwood bleached pulp is selected and mixed. The pulp is mixed so that at least 20% of one type of pulp is contained, and the degree of beating is increased in a 23L valley beater Preferably 30 to 60 [deg.] SR.

Confiscated landfill can be made by using a water pod. At this time, the basis weight of the water base paper is preferably about 20 to 80 g / m 2. Since the security paper according to the present invention laminates two sheets of paper, if the basis weight of the finished finished security paper is 90 ± 3 g / m 2, the basis weight of each paper sheet is to be 40 ± 2 g / m 2, It is preferable that the adhesive means (or adhesive agent) is applied at a rate of about 5 1 g / m 2.

It is preferable that the filler is injected within 10% and the opacity does not exceed 85%. If the opaqueness of the paper is too high, it is not visible even if discolored due to heat or light when the paper is printed so that the printed surface is located inside after printing with ink containing heat discolouration or photochromic ink. Therefore, May be an important factor that affects the clarity of the image.

As another preferred embodiment, the second raw paper 32 shown in Fig. 3 may be produced by crushing a silver form during the production of raw paper. It is also possible to attach a wire mesh (pressurized and copied) to a laboratory water weaver, and to collapse the silver shape at the stage of paper making. This will make the color of the silver coin equal to the color of the paper. When the paper thus crushed is used as the paper, the transmittance of light can be increased and the security can be further increased. Also, although not shown, the first raw paper 21 in Fig. 3 may also be manufactured by the above-described method. It is preferable to use stainless mesh of 80 mesh as the accessories of paper machine.

In step S13, the first raw paper 21 and the second raw paper 22, 32 to be used for the security paper according to the present invention are provided. The provided substrate may be the substrate prepared in the step S11, or may be a substrate prepared by another method. As shown in Fig. 3, only the second raw paper 32 may be provided as an indentation, or the first raw paper 21 may be pressed together, though not shown.

In step S15, a silver color is printed on one surface of the first paper 21 by a thermal coloring or photochromic ink or a combination thereof.

The ink 25 used for the silver-type printing may be a colorless or colored thermochromic ink, a colorless or colored photochromic ink, or a combination of at least one of them.

For example, when a plaid pattern is printed, a heat discoloration ink in which the vertical line of the plaid pattern changes from white to red at 60 DEG C is used, and a horizontal discoloration pattern of the plaid pattern is changed from white to blue at 80 DEG C , There is no shape before the temperature reaches 60 ° C. by applying heat to the security sheet (20). When the temperature exceeds 60 ° C., a vertical line of red appears. When the temperature exceeds 80 ° C., a blue horizontal line appears. Therefore, by using such a combination of various inks, a stronger security effect can be obtained.

The gravure ink type is the most preferable, but is not necessarily limited to, because the ink 25 to be used must be a roll type laminating paper. In addition, any type of ink can be used if it contains a thermochromic or photochromic material such as a screen, a plate, and an intaglio ink. In the embodiments described below, multi-step printing was performed on one to four screen plates for the visual discoloring effect according to the temperature and light change on the water base produced using the screen ink using the screen ink.

The thermochromic inks used are in the form of pigments or dyes, and there are various inks which change from white to color, from color to white or from color to color by heat, and generally have a characteristic of discoloring at a temperature of 40 to 250 ° C , Inks having reversible characteristics, and inks having irreversible characteristics, but the present invention is not limited thereto.

The photochromic inks used are in the form of pigments or dyes, and there are various inks which change from white to colored, from colored to white, or from colored to other colored by specific light. Specific light includes, but is not necessarily limited to, ultraviolet rays of sunlight, ultraviolet rays generated by an electric generator, and infrared rays.

In step S17, the first raw paper 21 and the second raw paper 22, 32 are joined together by an adhesive means.

An adhesive 27 is applied to one surface of the unprinted sheet (second sheet of paper 22, 32) for the lamination of the printed sheet (first sheet 21) and the unprinted sheet (second sheet 21, It is preferable to apply a coating amount of about 5 ± 1 g / m 2 using a rod bar.

The adhesive 27 used in the laminate may be, but not necessarily limited to, a water-soluble adhesive or a synthetic resin adhesive which is generally used in paper.

After the adhesive 27 is applied, a lamination can be performed so that the surface on which the silver pattern is printed is located inside.

As another preferred embodiment, in the case of the second raw paper 32 of FIG. 3, the silver shape is provided by being pressed in the paper making step S11. In this case, since the first raw paper is printed with the silver pattern, And the second raw paper 32 are joined together, the colored silver pattern of the first raw paper 21 and the pressed silver pattern of the second raw paper 32 coincide with each other. Therefore, when the rolled raw paper is used, the transmittance of light can be increased and the security can be further increased.

Here, when applying the adhesive agent 27 to the second raw paper sheet 32, it is necessary to apply a silver mirror surface (a shape opposite to the mirror image) to the surface. So that the colored silver pattern of the first raw paper sheet 21 and the pressed silver pattern of the second raw paper sheet 32 can be matched.

As another preferred embodiment, although not shown, the first raw paper 21 of FIG. 3 may also be provided with the silvered shape pressed in the paper making step S11, printing on the pressed silvered shape, You can do it.

After the laminating is performed, it is preferable to perform constrained drying in a flat dryer (hereinafter referred to as a flat dryer) made of stainless steel at 40 to 100 DEG C in step S19. The reason why the drying temperature is wide is that the discoloration range of the thermochromic material varies so that discoloration does not occur during drying, and restraint drying is performed so as to keep the laminated paper flat by the adhesive.

Referring to FIG. 2, a cross-sectional view of a security sheet, which is manufactured by S10 and includes color tone using color change and photochromic effect according to an embodiment of the present invention, includes a first sheet of paper 21, (Ink) 25 used for silver-type printing, and an adhesive means 27 are shown.

Referring to FIG. 3, in another embodiment of the present invention produced by S10, the difference from FIG. 2 is that the second raw paper 32, which has collapsed the silver shape in the raw paper making step S11, is used. By using this method, the light transmittance can be increased to further increase the security.

Hereinafter, the present invention will be described in more detail with reference to the following examples. However, the following examples are not intended to limit the scope of the present invention.

≪ Comparative Example 1 and Examples 1 to 4 >

Comparative Example 1 (Conventional method): A cotton fiber confined to 50 ± 5 ° SR was diluted to a concentration of 0.3 wt% to form a paper stock, and then the paper was weighed at 105 ° C. at 105 ° C. using a laboratory water weaver so as to have a basis weight of 90 ± 3 g / Lt; / RTI > At this time, the stainless steel mesh used as an accessory of the weevil was used with a thickness of 80 mesh, and the grid pattern was collapsed to produce the silver effect.

In Examples 1 to 4, reversible thermochromic inks which exhibit white at room temperature and discolor when the temperature rises are colored in various colors, that is, when temperature rises, silver is expressed, and two inks are used And the color is changed at two specific temperatures by performing 2-degree printing.

Example 1: A method of diluting a cotton fiber impregnated with 50 ± 5 ° SR to a concentration of 0.3 wt% to prepare a feedstock, followed by drying at 105 ° C. for 5 minutes using a laboratory weedy pod to obtain a basis weight of 40 ± 2 g / Two sheets were prepared. One of the manufactured water-based papers was screen printed using ink (white) containing a thermochromic material (60 ° C discoloration, white → red, reversible). A water-soluble adhesive was applied to the unprinted paper using a rod bar at a rate of 5 ± 1 g / m 2, followed by laminating so that the printed surface was located inside, followed by drying for 30 minutes using a flat drier at 40 ° C.

FIG. 4 is a flow chart schematically illustrating the process of laminating and the process of silver formation according to temperature changes of Example 1. FIG.

4, a white plaid pattern 25 is printed on the first paper stock 21 with the ink used in the first embodiment, and the second paper sheet 22 is bonded to the security paper 20, have. When heat of 60 ° C or more is applied to the manufactured security sheet 20, a red lattice pattern appears on the security sheet 20a, that is, silver appears. The inks used are reversible, so if you lower the temperature below 60 ° C, the silver coins disappear.

Example 2 Two water-repellent papers were prepared in the same manner as in Example 1 described above. The ink (white) containing the thermochromic material (60 ° C discoloration, white → red, reversible) is screen-printed at 1 degree on the manufactured paper and the other part of the same design is thermochromic (80 ° C discoloration, white → blue , Reversible) (white) was screen-printed at 2 degrees. A water-soluble adhesive was applied to the unprinted paper using a rod bar at a rate of 5 ± 1 g / m 2, followed by laminating so that the printed surface was located inside, followed by drying for 30 minutes using a flat drier at 40 ° C.

FIG. 5 is a process diagram schematically illustrating the process of laminating and the process of silver formation according to the temperature change of Example 2. FIG.

5, a white plaid pattern 25 is printed on the first paper base 21 with the ink of the two characteristics used in the second embodiment, and the security paper 20 is produced by laminating with the second paper base 22 Are shown. In Example 2, a thermochromic ink in which the vertical line of the plaid pattern changes from white to red at 60 DEG C is used, and the horizontal pattern of the plaid pattern is changed from white to blue at 80 DEG C, .

When heat of 60 ° C or more is applied to the thus formed security sheet 20, red plaid vertical lines appear on the security sheet 20a and when the temperature is raised to 80 ° C or above, blue plaid horizontal lines appear on the security sheet 20b . Since the inks used are reversible, when the temperature is lowered to 80 ° C or lower, the grid lines disappear, and when the temperature falls below 60 ° C, the silver disappears.

Example 3 Two water-repellent papers were prepared in the same manner as in Example 1 described above. One of the manufactured water-based papers was screen-printed with the ink (white) containing the thermochromic material (120 ° C discoloration, white → yellow, reversible). A water-soluble adhesive was applied to the unprinted paper using a rod bar at a rate of 5 ± 1 g / m 2, followed by laminating so that the printed surface was located inside, followed by drying for 30 minutes using a 100 ° C flat drier.

Example 4 Two water-repellent papers were produced in the same manner as in Example 1 described above. The ink (white) containing the thermochromic material (120 ° C discoloration, white → yellow, reversible) is screen-printed at 1 degree on the prepared water base paper and the heat-discoloring material (120 ° C discoloration, white → black , Reversible) (white) was screen-printed at 2 degrees. A water-soluble adhesive was applied to the unprinted paper using a rod bar at a rate of 5 ± 1 g / m 2, followed by laminating so that the printed surface was located inside, followed by drying for 30 minutes using a 100 ° C flat drier.

The method for producing colored silver used in Comparative Example 1 and Examples 1 to 4 is shown in Table 1 below.

Comparative Example 1 Example 1 Example 2 Example 3 Example 4 Final basis weight (g / ㎡) 90 90 90 90 90 Discoloration temperature (℃) - 60 60 120 120 80 Presence or absence of photochromism - radish radish radish radish Color fading - White → Red White → Red White → Yellow White → Yellow White → Blue White → Black Reversible / irreversible - Reversible Reversible Reversible Reversible Printing frequency - 1 degree 2 degrees 1 degree 2 degrees Drying temperature (° C) - 40 40 100 100 Remarks Conventional silver - - - -

≪ Examples 5 to 8 >

In Examples 5 to 8, non-reversible thermochromic inks showing white at room temperature and discolored at an elevated temperature were used in various colors, that is, silver was expressed when the temperature was raised. An example in which two printing is performed using two different inks is also performed.

Example 5 Two water-repellent papers were prepared in the same manner as in Example 1 described above. One of the manufactured water-based papers was screen-printed with the ink (white) containing a thermochromic material (80 ° C discoloration, white to red, irreversible) in white color. A water-soluble adhesive was applied to the unprinted paper using a rod bar at a rate of 5 ± 1 g / m 2, followed by laminating so that the printed surface was located inside, followed by drying for 30 minutes using a flat drier at 60 ° C.

Example 6 Two water-repellent papers were prepared in the same manner as in Example 1 described above. The ink (white) containing the thermochromic material (80 ° C discoloration, white → red, irreversible) is printed on the prepared water paper at a degree of 1 degree and the heat-discoloring substance (80 ° C discoloration, white → blue , Non-reversible) ink (white) was screen-printed at 2 degrees. A water-soluble adhesive was applied to the unprinted paper using a rod bar at a rate of 5 ± 1 g / m 2, followed by laminating so that the printed surface was located inside, followed by drying for 30 minutes using a flat drier at 60 ° C.

Example 7 Two water-repellent papers were prepared in the same manner as in Example 1 described above. One of the prepared water-based papers was screen printed using ink (white) containing a heat discoloring material (100 ° C discoloration, white → yellow, irreversible). A water-soluble adhesive was applied to the unprinted paper using a rod bar at a rate of 5 ± 1 g / m 2, followed by laminating so that the printed surface was located inside, followed by drying at 80 ° C for 30 minutes using a flat drier.

Example 8 Two water-repellent papers were prepared in the same manner as in Example 1 described above. The ink (white) containing the thermochromic material (100 ° C discoloration, white → yellow, irreversible) was printed on the prepared water paper at 1 degree screen and the other part of the same design was thermochromic (100 ° C discoloration, white → black , Non-reversible) ink (white) was screen-printed at 2 degrees. A water-soluble adhesive was applied to the unprinted paper using a rod bar at a rate of 5 ± 1 g / m 2, followed by laminating so that the printed surface was located inside, followed by drying at 80 ° C for 30 minutes using a flat drier.

The method for producing colored silver used in Examples 5 to 8 is shown in Table 2 below.

Example 5 Example 6 Example 7 Example 8 Final basis weight (g / ㎡) 90 90 90 90 Discoloration temperature (℃) 80 80 100 100 Presence or absence of photochromism radish radish radish radish Color fading White → Red White → Red White → Yellow White → Yellow White → Blue White → Black Reversible / irreversible Irreversible Irreversible Irreversible Irreversible Printing frequency 1 degree 2 degrees 1 degree 2 degrees Drying temperature (° C) 60 60 80 80 Remarks - - - -

≪ Examples 9 to 12 >

In Examples 9 to 12, iridescent or reversible thermochromic inks were used that showed color at room temperature and turned white when the temperature rises. That is, when the temperature rises, the silver color disappears. An example in which two printing is performed using two different inks is also performed.

Example 9 Two water-repellent papers were prepared in the same manner as in Example 1 described above. One of the prepared water-based papers was screen printed with ink (black) containing a thermochromic material (40 ° C discoloration, black → white, irreversible). A water-soluble adhesive was applied to the unprinted paper using a rod bar at a rate of 5 ± 1 g / m 2, followed by laminating so that the printed surface was located inside, followed by drying for 30 minutes using a flat drier at 30 ° C.

Example 10 Two water-repellent papers were prepared in the same manner as in Example 1 described above. The ink (black) containing the thermochromic material (40 ° C. discoloration, black → white, irreversible) was screen-printed on the prepared water-based paper at one degree and the other part of the same design was thermochromic (40 ° C. discoloration, , Non-reversible) was screen-printed at 2 degrees. A water-soluble adhesive was applied to the unprinted paper using a rod bar at a rate of 5 ± 1 g / m 2, followed by laminating so that the printed surface was located inside, followed by drying for 30 minutes using a flat drier at 30 ° C.

Example 11 Two water-repellent papers were prepared in the same manner as in Example 1 described above. One of the prepared water-based papers was screen-printed with ink (black) containing a thermochromic material (100 ° C discoloration, black → white, reversible). A water-soluble adhesive was applied to the unprinted paper using a rod bar at a rate of 5 ± 1 g / m 2, followed by laminating so that the printed surface was located inside, followed by drying at 80 ° C for 30 minutes using a flat drier.

FIG. 6 is a process diagram schematically illustrating the process of laminating and the process of silver formation according to temperature change of Example 11. FIG.

6, a black lattice pattern 25 is printed on the first sheet of paper 21 with the ink used in Example 11, and the security paper 20 is produced by laminating with the second paper sheet 22 Respectively. The manufactured security sheet 20 shows silver at room temperature and shows that the lattice pattern, that is, the silver sheet disappears from the security sheet 20a when heat of 40 ° C or more is applied. The ink used is reversible, so when the temperature is lowered to 40 ° C or less, silver appears again.

Example 12 Two water-repellent papers were prepared in the same manner as in Example 1 described above. The ink (black) containing the thermochromic material (100 ° C. discoloration, black → white, irreversible) is screen-printed on the prepared water-based paper at 1 degree, and heat-coloring material (100 ° C. discoloration, blue → white , Reversible) was screen-printed at 2 degrees. A water-soluble adhesive was applied to the unprinted paper using a rod bar at a rate of 5 ± 1 g / m 2, followed by laminating so that the printed surface was located inside, followed by drying at 80 ° C for 30 minutes using a flat drier.

The method for producing colored silver used in Examples 9 to 12 is shown in Table 3 below.

Example 9 Example 10 Example 11 Example 12 Final basis weight (g / ㎡) 90 90 90 90 Discoloration temperature (℃) 40 40 100 100 Presence or absence of photochromism radish radish radish radish Color fading Black → White Black → White Black → White Black → White Blue → White Blue → White Reversible / irreversible Irreversible Irreversible Reversible Irreversible Irreversible Reversible Printing frequency 1 degree 2 degrees 1 degree 2 degrees Drying temperature (° C) 30 30 80 80 Remarks - - - -

≪ Examples 13 to 15 >

Hereinafter, in Example 13, printing was performed using a combination of a thermochromic ink and a photochromic ink. In Example 14, printing was performed using a thermochromic ink according to the present invention on a water-base paper produced by pressing silver, In Example 15, printing was performed using a photochromic ink on water-base paper produced by pressing silver.

Example 13 Two water-repellent papers were prepared in the same manner as in Example 1 described above. The ink (white) containing the thermochromic material (100 ° C. discoloration, white → red, reversible) was screen-printed on the water base paper at 1 degree and the photochromic material (white → blue, reversible) The contained ink (white) was screen printed at 2 degrees. A water-soluble adhesive was applied to the unprinted paper using a rod bar at a rate of 5 ± 1 g / m 2, followed by laminating so that the printed surface was located inside, followed by drying at 80 ° C for 30 minutes using a flat drier.

Example 14: After finishing a ground by diluting 0.3% by weight of a cotton fiber impregnated with 50 ± 5 ° SR, a wire mesh impregnated so as to have a basis weight of 40 ± 2 g / m 2 was attached to a laboratory water weaver, Two sheets were prepared by drying for 5 minutes. The ink (white) containing the thermochromic material (100 ° C discoloration, white → red, reversible) was applied to the silver fabric of the prepared water-based paper by 1 degree screen printing. The water-soluble adhesive was applied to the unprinted silver paper using a rod bar at a rate of 5 ± 1 g / m 2, followed by laminating so that the printed surface was located inside, followed by drying at 80 ° C. for 30 minutes using a flat drier.

FIG. 7 is a process diagram schematically illustrating the process of kneading and the process of developing silver according to the temperature when raw paper having a silver shape is pressed according to Example 14 according to still another embodiment of the present invention.

Referring to FIG. 7, the difference from FIGS. 4 to 6 is that the second raw paper 32, in which the silver pattern is pressed in the raw paper making step S11, is used as described with reference to FIG. By using this method, the light transmittance can be increased to further increase the security. In the fourteenth embodiment, not only the second raw paper 32 but also the first raw paper 21 is formed in a shape. (White) containing a thermochromic material (100 ° C discoloration, white → red, reversible) in an arrow shape is applied to the first raw paper 21 having an arrow shape depressed in the raw paper making step S11 by 1 degree screen printing Respectively. Then, an adhesive agent was applied to the surface of the second raw paper 32 on which the same arrow shape had been pressed so that the silver (mirror) shape was visible so that the silver (arrow) shape coincided.

When a heat of 100 ° C or more is applied to the manufactured security sheet 20, a red arrow pattern appears on the security sheet 30a, that is, silver appears. The inks used have reversible characteristics, so if the temperature is lowered to 100 ° C or lower, the silver halide disappears.

Example 15: A cotton fiber impregnated with 50 ± 5 ° SR was diluted to a concentration of 0.3 wt% to form a ground material, and then the wire mesh impregnated in a conventional manner was attached to a laboratory water weaver so as to have a basis weight of 40 ± 2 g / Two sheets were prepared by drying at 105 DEG C for 5 minutes. The ink (white) containing the photochromic material (white → blue, reversible) was screen-printed at 1 degree on the silver paste of the prepared paper. The water-soluble adhesive was applied to the unprinted silver paper using a rod bar at a rate of 5 ± 1 g / m 2, followed by laminating so that the printed surface was located inside, followed by drying at 80 ° C. for 30 minutes using a flat drier.

The method for producing colored silver used in Examples 13 to 15 is shown in Table 4 below.

Example 13 Example 14 Example 15 Final basis weight (g / ㎡) 90 90 90 Discoloration temperature (℃) 100 100 - Presence or absence of photochromism U radish U Color fading White → Red White → Red White → Blue White → Blue Reversible / irreversible Reversible Reversible Reversible Printing frequency 2 degrees 1 degree 1 degree Drying temperature (° C) 80 80 80 Remarks - Use silver-impregnated paper Use silver-impregnated paper

As described above, according to the embodiments of the present invention, it is possible to perform coloring with a wide variety of characteristics in various combinations of various conditions. For example,

(One) Combinations using a plurality of thermochromic inks having different discoloration temperature characteristics

(2) Combinations using a plurality of thermochromic inks having different colors

(3) Combinations using inks that change from white to color as the temperature rises and inks that change from color to white; In other words, when the temperature increases, silver coins appear and disappear

(4) Combination of thermochromic ink and photochromic ink

(5) Combination of inks with reversible properties and inks with irreversible properties

(6) In case of using raw paper in which silver is impregnated when producing paper

(7) Combinations of the above cases

And various other characteristics can be exhibited in various combinations.

As described above, according to the present invention, by applying colorless or colored heat discolouring or photochromic ink to produce a security paper, after printing the silver pattern on the base paper and then laminating it so that the printed surface is not exposed, 1) 2) By applying various color combinations of heat discoloration or photochromic ink, it is possible to produce a much stronger anti-fake effect by using various properties than when using a single substance. 3) the durability is increased because the material used for silver printing is located inside the paper, 4) the additional equipment for implementing the shape of the silver in the paper making step is not needed, thus reducing the production cost and production time, and 5) ) Security paper, which may apply the manufacturing method according to the present invention to a specific part of the silver sheet which has been collapsed in the production of paper, And a manufacturing method thereof.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, . Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

20, 30: Security paper
21: 1st original paper
22: 2nd original paper
25: ink for printing a silver pattern
27: Adhesion means
32: a second paper sheet in which silver is impregnated when paper is manufactured

Claims (10)

Providing a first paper stock and a second paper stock;
Printing a silver pattern on one surface of the first sheet of paper; And
Attaching and laminating one surface of the second original paper and the surface of the first original paper on which the silver pattern is printed so that the printed surface is not exposed;
, ≪ / RTI &
Wherein the silver pattern is printed using at least one of a colorless or colored heat-color-change ink and a colorless or colored photochromic ink,
Wherein the silver shape changes color upon exposure to one or more specific temperatures or one or more specific lights.
The method according to claim 1,
Wherein the first paper sheet or the second paper sheet is provided by pressing the silver sheet.
The method according to claim 1,
Wherein the printing step further includes a step of printing the silver pattern in a multi-
Wherein at least one of the heat discoloration ink and the photochromic ink is used for printing at the respective stages of the multi-stage printing.
The method according to claim 1,
Further comprising the step of constraining and drying after the lapping step,
Wherein the constraint drying is performed at a temperature at which discoloration of the thermochromic ink does not occur.
The method according to claim 1,
Wherein the ink is in the form of a pigment or a dye and is changed from white to colored, from colored to white or from colored to other colored by heat or light.
The method according to claim 1,
Wherein the thermochromic ink comprises an ink having reversible or irreversible characteristics.
The method according to claim 1,
Wherein the ink is a plate, an intaglio, or an ink manufactured for screen printing.
A first sheet of paper on which a silver pattern is printed on one surface; And
And a second paper sheet adhered to the printed surface of the first paper sheet by the bonding means so that the printed surface is not exposed,
Wherein the silver pattern is printed using at least one of a colorless or colored heat discoloration ink and a colorless or colored photochromic ink,
Wherein said silver shape changes color upon exposure to one or more specific temperatures or one or more specific lights.
9. The method of claim 8,
A silver-like mirror shape is formed by being pressed on a surface of the second paper sheet adhered to the first paper sheet,
Wherein the first paper sheet and the second paper sheet are laminated so that the silver shape and the mirror shape coincide with each other.
10. The method according to claim 8 or 9,
The silver sheet is pressed and formed on one surface of the first paper sheet,
Wherein the printing is performed on the pressed silvered shape.

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