KR20020055739A - A process for the preparation of an improved security thread, and the security paper including the security thread - Google Patents

Abstract

PURPOSE: Provided are a manufacturing method of a hidden line having colored letters or a colored pattern which is characterized by preventing counterfeiting of coins effectively and increasing optical effect, and security paper having the line. CONSTITUTION: The hidden line is obtained by a process containing the steps of: depositing a metal deposited layer to plastic transparent film with printed colored letters or printed colored pattern with a sputtering method, followed by sticking the metal deposited layer on the film; or adhering at least two of film depositing the metal deposited layer to the plastic transparent film with printed colored letters or printed colored pattern to produce the hidden line having at least two of the metal deposited layer and 25-40micron of thickness.

Description

A process for the preparation of an improved security thread, and the security paper including the security thread}

The present invention relates to a method for manufacturing a silver wire having colored letters or patterns and a security paper including the silver lines, and more particularly, to deposit a metal deposition layer directly on a plastic transparent film printed with colored letters or patterns by a sputtering method. After adhering the metal deposition layer to another film on which the metal deposition layer is deposited, or by adhering two or more films on which the metal deposition layer is deposited on a transparent plastic film printed with colored letters or patterns, having at least two metal deposition layers. The present invention relates to a method for producing a silver wire having a thickness of ˜40 microns and a security paper including the silver wire thus produced.

Generally, when manufacturing securities such as banknotes, checks, and securities, a hidden line is inserted to prevent counterfeit.

The silver wire is inserted into paper after being deposited on a plastic transparent film based on a metal material such as aluminum, as shown in FIG. 3. In addition, black or colored letters or patterns printed on the transparent plastic film (see FIGS. 1 and 2) and clear text hidden lines (see FIG. 4) to make the letters appear transparent on the metal deposition layer, In order to have inherent characteristics, there are silver wires applied with various special technology elements such as fluorescence treatment, electrical conductivity provision, magnetic wavelength, hologram characteristics, and color conversion, and these silver wires are narrowly cut into narrow widths of about 0.5mm to 5mm. It is inserted into the paper during paper manufacturing, and these hidden wires occupy a very important position as anti-counterfeiting elements of securities.

International Patent Publication No. 99-45199 discloses a hidden line composed of a combination of transparent letters and colored letters of the type shown in FIG. 5, which is a transparent letter made by partial deposition of a metal or nonmetallic layer on a plastic film. B. It is manufactured by printing colored micro letters or patterns in gravure printing method on the non-deposited part which is transparent at regular intervals with the pattern part. In the case of metal deposition part, the part of vapor deposition part has no problem because the letters or patterns are transparent. The non-letter portion meets the basic optical characteristics of the silver line by the optical effect of the deposition layer, but the non-deposition portion prints a predetermined letter or pattern of a colored system in a gravure manner. As in the case of hidden lines made by printing colored letters or patterns, If the amount is a certain size (0.6mm or more), the printed part is inserted inside the paper and then transmitted through the bright light, except when the color of the character is very weak even in the reflected light. There is a problem that colors are exposed out of paper.

At this time, if the color is too weak, the effect of the colored letters is halved, so in order to increase the color effect of the text, the color should be printed to a certain extent, in which case, the copying function is insufficient because the copying function is insufficient. Poem character and color are reproduced.

However, it is not so easy to adjust the color of text in a gravure fashion. Therefore, it is necessary to solve the problem not to be reproduced in the color copy while utilizing the effect of basic colored characters or patterns, and to increase the optical effect (the effect visible in the transmitted light but not reflected in the reflected light), which is a general hidden line characteristic.

Accordingly, an object of the present invention is to solve the problem of the hidden line including the conventional colored, to provide a method of producing a hidden line that can increase the optical effect while not reproduced in the color copy while utilizing the effect of the basic colored characters or patterns. In addition, the present invention provides a security paper including the hidden wire thus manufactured.

Method for producing a silver wire of the present invention for achieving the above object is, by depositing a metal deposition layer directly on the plastic transparent film printed with colored letters or patterns by sputtering method, or by adhering with the other film deposited metal deposition layer, A method of manufacturing a silver wire having a thickness of 25 to 40 microns with at least two or more metal deposition layers by adhering two or more films on which a metal deposition layer is deposited on colored transparent letters or patterns printed plastic transparent films. .

In addition, the security paper for achieving the object according to the present invention includes the prepared hidden line.

Figure 1 shows an example of the hidden line is printed conventional colorless characters,

2 shows an example of a hidden line on which a conventional pattern is printed,

Figure 3 shows a cross section of the transparent film on which the metal deposition layer is deposited, and in this case a plan view showing the color of the metal deposition layer,

Figure 4 shows an example of a clear text hidden line is printed transparent characters,

5 shows a hidden line in which transparent characters and colored letters are combined, and a configuration diagram of such hidden lines,

6 is an exemplary view showing a step of manufacturing a hidden line according to the present invention,

7 is an exemplary view showing a step of manufacturing another hidden line according to the present invention.

Hereinafter, the present invention will be described with reference to the accompanying drawings.

As described above, in the present invention, a very thin metal layer is coated on the silver line printed with colored letters or patterns having a size of 0.6 mm or more, so that the effect of color is preserved while the reflection is invisible.

In general, vacuum deposition is used to deposit metals during the production of silver wire. In the vacuum deposition process, a metal, a metal compound or an alloy is evaporated in a vacuum to condense the evaporated metal or the evaporated metal compound on the surface of the target material to form a thin film. This is how you do it. The above method is easy to work, but when the thickness of the coating layer is overlaid on the color part, the colored color becomes invisible, and it is difficult to achieve the desired purpose, and it is difficult to control the coating amount for forming the required thin film. Has a problem.

Therefore, in the present invention, the metallization is developed by using a sputtering method that is easier to control the thickness of the metallization. In this case, there is no need to consider the density of colors in printing.

Examples of the plastic transparent film used in the production of the silver wire according to the present invention include polyamide such as nylon, polyester, polyacryl, polyvinylacetate, polyethylene, and polyvinyl chloride. Typical plastic films have a thickness of 16 to 25 microns, which means that if the total thickness of the silver wire to be manufactured becomes too thick, the change in the paper thickness of the hidden line insertion portion is increased too much when loaded into the paper, and when printing a large amount of paper or printing problems There is a risk of occurrence. Therefore, in the present invention, a plastic film having a thickness of about 12.5 to 19 microns is used as the base material, and a plastic film having a thickness of 10 to 13 microns may be used when it is manufactured for the purpose of imparting optical properties of only metal deposition by sputtering. do.

In addition, Figure 6 and Figure 7 shows a step of manufacturing a silver wire according to the present invention step by step, in detail, in the case of manufacturing the silver wire as shown in Figures 1, 2, 4 and 5 the plastic transparent film Colored printing is performed on it, and a metal vapor deposition layer is applied here.

As shown in FIG. 3, an optical property may be imparted by applying a metal deposition layer to the transparent film. As described above, when the metal is deposited on the plastic transparent film, the vacuum deposition method is used, and since the vacuum deposition method inherents the problems described above, in the present invention, the metal is formed by using a sputtering method that is easy to control the thickness of the metal deposition layer. Film thinly. At this time, the thickness of the metal coating layer for obtaining the effective metal deposition effect is 10 to 20 microns. If the thickness of the metal deposition layer is less than 10 microns, the colored layer printed portion is visible, and if the thickness exceeds 20 microns, the colored printed portion is not visible.

In addition, the present invention is to include at least two or more metal deposition layer, such a method by depositing the metal deposition layer directly on the plastic film printed the colored letters or patterns, the transparent film on which the metal deposition layer is deposited It may be completed by bonding, or may be prepared by bonding two or more transparent films on which a metal deposition layer is deposited on the colored film printed with colored letters or patterns.

In the method of laminating and bonding the respective films in this way, it is important to make the metal coating part visible from the outside rather than the printing part when viewed from both sides in order to prevent reproduction during copying due to color expression in the silver line. This gives the effect of protecting the colored portions.

The film thus manufactured is used as a hidden line that is cut into a width of 1 to 10 mm and put into the anti-counterfeiting paper. When the width of the hidden line exceeds 10 mm, paper manufacturing becomes difficult and causes a number of problems such as printing due to the inserted hidden line. .

Also, in order to protect the optical properties of the metal deposition layer, the metal deposition layer should be directed inward as much as possible when bonding the two layers.

The method for manufacturing a security paper using the silver wire produced by the present invention is to insert the two paper layers after the paper sheet is formed in the paper manufacturing process in the process of producing a paper sheet in the general network or long network during the manufacturing process of the paper It can manufacture by throwing in between in the process of lamination.

Security paper produced in accordance with the present invention can be effectively forgery prevention and authenticity discrimination because the color copy color is not reproduced, and whether or not the input of the security paper by the optical effect due to reflection is not well represented.

Hereinafter, the present invention will be described in more detail, but the present invention is not limited thereto.

Example 1

As shown in FIG. 6, a 15 micron metal deposition layer was coated on a 12.5 micron transparent plastic film A to prepare a film A-1. Separately, a film B was prepared by printing colored letters of 0.6 mm on one side by gravure printing on a 16 micron plastic film as shown in FIG. 1. A 15 micron metal deposition layer was coated thereon to prepare a film (B-1).

The prepared films (A-1 and B-1) were usually laminated by the method of adhering two films to make C, and the prepared C was cut to a width of 1.0 mm to prepare a silver wire.

Example 2

As shown in FIG. 6, a film (A-1) was prepared by coating an 18-micron metal deposition layer on a 12.5 micron transparent plastic film (A). Apart from this, after printing 0.8 mm colored letters on one side by gravure printing on a 16 micron plastic film as shown in FIG. 5 and printing certain letters with washable ink to make a letter part of transparent letters, general metal deposition method The film (B) was prepared by forming a deposited layer and washing with water, and a film (B-1) was prepared by coating an 18-micron metal deposition layer.

The prepared films (A-1 and B-1) were usually laminated by bonding two films to make C, and the prepared C was cut to a width of 1.2 mm to prepare a silver wire.

Example 3

As shown in FIG. 7, a film (A-1) was prepared by coating a 20-micron metal deposition layer on a 12.5 micron transparent plastic film (A). In the same manner as above, the film (C-1) was produced. Separately, 1.0mm colored letters are printed on one side by gravure printing on a 12.5 micron plastic film as shown in FIG. 5, and a certain letter is printed again with a flush ink to make a letter part of transparent letters. The film (B) was produced by making a vapor deposition layer and washing with water.

The films (A-1) and (B) are usually laminated by a method of adhering two films to prepare D as an intermediate product, and the prepared D and the prepared film (C-1) are adhered to form E to make E. Was cut to a width of 1.2 mm to prepare a silver wire.

Comparative Example 1 and Comparative Example 2

1 and 2, printed on 25 micron plastic film by gravure printing colored letters and patterns of 0.6mm on one side and cut to a width of 1.0mm to produce a hidden line, respectively.

Comparative Example 3

As shown in Figure 5, printed on the 25-micron plastic film by gravure printing on one side of the 0.8mm colored letters, and after printing a certain letter again with a flush ink to make the letter portion of the transparent letter by a general metal deposition method A silver wire was manufactured by cutting a film prepared by forming a deposition layer and washing with water to a width of 1.2 mm.

Each of the silver wires produced by the above Examples and Comparative Examples was inserted directly into a single paper by a normal charging method during paper manufacturing in a ring paper machine to prepare a paper.

As a result of testing the reproducibility of the produced paper by using a color copying machine, the paper of the comparative example which is a conventional product is reproduced in color when the color is reproduced. As the character part was not reproduced, the effect of preventing forgery and alteration was excellent.

The silver wire manufactured by the manufacturing method according to the present invention solves the conventional problem that, after being inserted into the paper, the color is exposed to the outside of the paper to reproduce the color when the color is copied, thereby reducing the effect of anti-counterfeiting. It is an excellent feature that maximizes the effect as an anti-counterfeiting element by increasing the optical effect which is a basic characteristic.

Claims (4)

Deposition of the metal deposition layer directly on the transparent plastic film printed with colored letters or patterns by sputtering method, and then adhered to the film deposited with the metal deposition layer, or by depositing a metal deposition layer on the plastic transparent film with colored letters or patterns printed A method for producing a silver wire having colored letters or patterns by bonding two or more films to each other to produce a silver wire having at least two or more metal deposition layers and having a thickness of 25 to 40 microns. The method of manufacturing a silver wire having colored letters or patterns according to claim 1, wherein the metal deposition layer has a thickness of 10 to 20 microns. The method of claim 1, wherein the size of the printed character or pattern is 0.6mm to 3mm and the width of the cut hidden line is 1 to 5mm. The anti-counterfeiting security paper comprising a silver wire produced by the method according to any one of claims 1 to 3.