KR20120077587A - Security fibers and papers using the same - Google Patents

Abstract

PURPOSE: A fiber for security and paper using the same are provided to prevent forgery and to ensure easy detection. CONSTITUTION: A fiber for security comprises synthetic resin and a color expression substance. The cross section of the fiber is 70 um^2 to 0.3 mm^2 and contains one or more kinds of metals selected from iron, neodymium, cobalt, copper, nickel, and zirconium. A method for manufacturing the fiber comprises: a step of providing two or more master batches of synthetic resin and color expression substance; a step of dividing cross section of the fiber into each area and spinning from two or more master batches; a step of twisting the fibers to express repetitive pattern; and a step of applying the fibers into security products.

Description

Security fibers and papers using the same}

The present invention relates to a security fiber and a paper using the same.

In general, security fibers have a characteristic of emitting light, discoloring, fluorescence and phosphorescence in response to wavelengths or thermal conditions of an electromagnetic field through manufacturing a fiber or dyeing or coating a fiber including a special material. It provides a function as a security element through the method.

In addition, the morphological characteristics of the security fiber has a unique cross-sectional shape, such as polygonal, elliptical, star-shaped, hollow fiber in addition to a single fiber or a composite fiber form or a circular cross section. Security fibers having such individual characteristics are partially used in security products, and are utilized as security elements.

Color yarns are commonly used by attaching or dyeing general dyes, fluorescent pigments, invisible fluorescent dyes, visible fluorescent dyes, and the like to fibers prepared by the spinning process of synthetic resins.

For example, Patent Documents 1 and 2 describe a method for producing a fluorescent fiber that is excited by infrared light, visible light, ultraviolet light, and X-ray light and contains a fluorescent substance.

In addition, Patent Document 3 discloses a fiber manufacturing method having a plurality of fluorescent colors using partial dyeing technology, and Patent Document 4 discloses a fluorescent material that is excited by a visible light source and is emitted as infrared light and is excited by visible light. Techniques for the production of security fibers comprising all emitted fluorescent materials are described.

In addition, Patent Document 5 describes a technique for manufacturing a security fiber by using a material that is excited under sunlight or an artificial light source and has a phosphorescent property, and thereby prevents forgery or tampering of the security product. A technique has been described which gives a colorless or near colorless fiber a functional element that prevents forgery or modulation using dichroic phosphors and fluorescent synthetic resins.

In addition, Patent Documents 7 and 8 describe a technique for producing a fiber having a unique cross-sectional shape, including a plurality of security materials that react within a wavelength range of 200 to 2000 nm.

In addition, Patent Document 9 discloses a technique for finely labeling the filler mixed in the artificial fiber by laser beam to the whole or partial discoloration, Patent Document 10 by mixing a phosphorescent metal aluminate pigment in the thermoplastic polymer A method for producing a fluorescent fiber is described.

In addition, the conventional silver is one color when the color becomes visible to the naked eye by a special wavelength. For example, when irradiating a wavelength of 365 nm, it has a green fluorescence or a monochromatic fluorescence such as red. These gifts have sufficient security features for low-level forgeries, but they do not have enough security features for large-scale forgeries by recent high-counterfeiting agents. For example, in the forgery of the EURO, the gift was forged by the printing method using the fluorescent pigment, so that it was in a similar form that was difficult to be recognized by the general public.

Recently, with the development of synthetic technology, commercial fluorescent materials are widely used. Although these fluorescent materials lag behind in terms of luminescent properties and quality compared to fluorescent materials used as security materials, they are enough to deceive the public. Therefore, there is a need to further strengthen the security product security.

U.S. Patent 4,655,788 U.S. Patent 4,921,280 Korean Patent No.0259825 Korean Patent No. 0574411 Korean Patent No. 0346058 Korean Patent No. 0363720 U.S. Patent 7,122,248B2 U.S. Patent 7,357,986B2 Korean Patent No. 0007051A U.S. Patent 5,674,467

Accordingly, in the present invention, as a result of extensive research in order to solve the above necessity, it was possible to provide a security fiber manufacturing technology having a high degree of authenticity with a large number of security characteristics, and the present invention was completed based on this.

In addition, by providing a number of colors or fluorescence at the same time, it is difficult to falsify the printing method and increase the public's recognition, and improve the security of security products using this to distribute sound securities and security products Will contribute to the establishment of order.

Accordingly, the present invention provides a twisted security fiber having a repeated pattern in the longitudinal direction in which light emission characteristics change depending on a particular wavelength among infrared, visible, ultraviolet, and X-ray ranges.

In addition, the present invention provides a method for producing the security fiber.

The present invention also provides a security paper containing the security fibers.

Security fibers according to an embodiment of the present invention is characterized in that the twisted to express two or more colors in the longitudinal direction in the wavelength range of 0.1nm to 2000nm in a repeated pattern form while being adjacent to each other.

According to one embodiment of the invention, the twisted security fibers are characterized in that the length of at least one of the two or more colors appear in the range of 50㎛ to 10mm.

According to one embodiment of the invention, the cross-sectional area of the security fiber is characterized in that more than 70㎛ ² 0.3mm ² .

According to one embodiment of the invention, the fiber is characterized in that it further comprises at least one metal component having magnetic properties selected from the group consisting of iron, neodymium, cobalt, copper, nickel, and zirconium.

According to one embodiment of the invention, the fiber comprises at least two or more security elements, the security element has a certain color or fluorescence characteristics, and receives a specific wavelength of energy to be emitted as energy of another specific wavelength It is done.

According to another embodiment of the present invention, the step of providing at least two or more master batch (mix) of the synthetic resin and the color expression material, divided into each area on the cross section of the fiber from the two or more master batch In the fiber manufacturing step, to provide a security fiber is twisted and fixed under a constant condition so that at least two colors in the longitudinal direction in the fiber in the wavelength range of 0.1nm to 2000nm in a repeated pattern form adjacent to each other, And applying the fiber to a single material and a security product.

According to one embodiment of the present invention, the synthetic fiber is polyester, such as polyethylene terephthalate, polybutylene terephthalate, acrylic, polyamide, polyvinyl alcohol, acetate, polypropylene, polyolefin, poly It is characterized by using at least one member selected from the group consisting of carbonate-based and cellulose-based.

According to one embodiment of the invention, the method further comprises adding a metal component to the master batch.

According to one embodiment of the present invention, the method further comprises the step of dyeing the fibers.

According to one embodiment of the invention, the twist is characterized in that the twist is applied 100 to 20000 times per meter.

According to one embodiment of the present invention, the color expression material is a fluorescent material having a fluorescence property, the fluorescent material is characterized in that it is added in an amount of 0.1% to 20% by weight.

According to one embodiment of the present invention, the length of the fiber in the cutting step is characterized in that the cutting to a constant length of 8mm or less.

The terms or words used in this specification and claims are not to be construed in a conventional, dictionary sense, but the principle that the inventors may appropriately define the concept of terms in order to best describe their invention in the best way possible. It should be interpreted as meaning and concept corresponding to the technical idea of the present invention.

According to the present invention, by providing a twisted security fiber having at least two or more security elements, making the printing method difficult forgery, and also has the advantage of improving the public's recognition.

In addition, according to the present invention, by applying to the security sewing thread, security fibers or security paper including a fluorescent material as a color expression material can be provided by applying a twist in a certain repeated form.

In addition, the fiber produced by the present invention can be identified in the form of a plurality of colors when observed with the naked eye and magnifying glass, the color that appears after applying a light or magnetic field of a constant wavelength to check the fluorescence characteristics, magnetic properties There is an advantage that can be easily identified with the naked eye and a magnifying glass, and when the paper is manufactured using such security fibers, the paper having the same unique characteristics as the security fibers can be manufactured by a simple method.

1 is a security fiber according to the conventional prior art.
Figure 2 is a view showing a case of irradiating ultraviolet rays as a security fiber applied two colors according to an embodiment of the present invention.
3 is a view showing a security fiber in visible light according to an embodiment of the present invention.

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

Security fiber according to the present invention uses properties to improve the visual effect of security elements and fibers for authenticity verification and anti-counterfeiting of security products, such as securities such as banknotes, checks, gift certificates, passports, certificates, credit cards, etc. For example, a fabric material, a pen, a label, a band, and the like are generally used as synthetic fibers, yarns, gifts, security yarns, yarns, and security fibers.

The present invention relates to a fiber and a paper using the same in which the light emission characteristics change depending on a particular wavelength in the infrared, visible, ultraviolet, and X-ray ranges, and more particularly, partial characteristics of the fiber when viewed in the longitudinal direction. Some of them show ultraviolet fluorescence, general visible color and infrared fluorescence. In addition, depending on the particular wavelength, two or more different wavelengths may appear, and may appear partially broken, and one or more other colors may appear in succession.

1 is a view showing a gift which may have a conventional conventional single color or two colors, Figure 2 is a case of irradiating ultraviolet rays as a security fiber applied two colors according to an embodiment of the present invention. Referring to FIG. 2, a fiber having two colors (for example, blue and red), which are expressed in different colors in ultraviolet light, is gradually twisted from blue when irradiated with ultraviolet rays by twisting in a fiber spinning process. It shows the security fiber which is seen continuously in red. FIG. 3 illustrates a fiber obtained by dyeing the outer surface of the fiber as shown in FIG. 2 with a dye which is expressed in visible light. For example, when the visible light is irradiated, the fiber is green, and when the infrared light is irradiated, the fiber is blue in a specific pattern. When irradiated with ultraviolet light, a certain pattern of red color appears.

As such, in the present invention, while providing a plurality of colors or fluorescent properties to the fiber at the same time, by twisting the fiber to make the forgery of the printing method difficult and can increase the recognition of the general public.

According to a preferred embodiment of the present invention, it is possible to provide such a property by including a plurality of color to fluorescent material in the gift and twist it in a certain repeated form. More specifically, at least two or more master batches expressing different colors in the process of manufacturing the fiber may be achieved by applying a twist to have a constant pattern while injecting into the spinning machine. Therefore, the fiber includes at least two or more security elements, and the security element has a certain color or fluorescence characteristics, and may receive energy of a specific wavelength and emit it as energy of another specific wavelength.

Security fiber according to the present invention, when the length of at least one of the two or more colors is twisted to less than 50㎛ occurs a decrease in the physical strength of the fiber and the two or more security elements cause visual interference with each other constant color However, it is difficult to detect fluorescence. In addition, it is preferable to include a range of 50 μm to 10 mm since twisting more than 10 mm may visually weaken the repeating pattern of two or more security elements. Moreover, it is preferable that the cross-sectional area of the said fiber is 70 micrometer <^2> or more and 0.3 mm <^2> or less. If less than 70㎛ ² , even if the diameter of the fiber is less than about 5㎛ polyamide fiber having a strong physical rigidity has a low strength of less than 10g, there is a difficulty in the process of twisting and post-processing. When the diameter exceeds 0.3 mm 2, the diameter of the fiber becomes about 300 μm based on the annular shape, and in this case, it is difficult to use the sewing thread.

According to the present invention, the fiber comprises at least two security elements, providing at least two master batches of a synthetic resin and a color expressing material, each of which is divided into respective regions on a cross section of the fiber from the at least two master batches. In the fiber manufacturing step of spinning, the fibers are twisted and fixed under constant conditions so that two or more colors in the length direction in the wavelength range of 0.1 nm to 2000 nm are adjacent to each other and appear in a repeated pattern form to provide a security fiber. And the step of applying the fiber to a cut and a security product.

Providing the master batch is a step of mixing the synthetic resin and the color expression material, the synthetic fibers are polyester-based, such as polyethylene terephthalate, or polybutylene terephthalate, acrylic, polyamide, polyvinyl alcohol, One or two or more mixture resins of acetate-based, polypropylene-based, polyolefin-based, polycarbonate-based, and cellulose can be used, but are not limited thereto. In addition, the resin may be mixed in an amount of about 80% by weight to about 99.9% by weight.

Here, the color expression material may include a general dye, a fluorescent pigment, an invisible fluorescent dye, a visible fluorescent dye, a pigment, a fluorescent material, a phosphor, and the like, and a material expressing a color in a wavelength range of 0.1 nm to 2000 nm. Includes everything.

In one embodiment of the present invention, the fluorescent material is a phosphor having a fluorescent property may be added in an amount of about 0.1% by weight to 20% by weight, sufficiently mixed with the resin and then extruded by an extruder to prepare a master batch. At this time, the operating conditions of the extruder can be adjusted according to the type of synthetic resin.

As described above, the synthetic resin discharged through the nozzle of the extruder may be processed into a chip form for a spinning process that is a fiber manufacturing step. The size of each chip may be about 5 kW to about 15 kW, and more specifically, about 8 kW to 12 kW. The manufacturing conditions may be used somewhat modified in the manufacturing process.

The at least two or more master batches include at least two or more security elements, and the security elements have a certain color or fluorescence property, and may receive energy of a specific wavelength and emit the energy of another specific wavelength.

As a more specific example, a material having a characteristic of being excited by an electromagnetic wave having a wavelength of 0.1 nm to 2000 nm and emitted at a wavelength of 200 nm to 2000 nm may be used. Examples of materials having these properties include Honeywell Lumilux® Green RGS-4, Red RGS-4, PHOSPHOR TECHNOLOGY UKL63, UKL65, and the like.

In addition, honeywell Lumilux® CD128, CD116, CD139, PHOSPHOR TECHNOLOGY PTB460, PTG505, PTR625, and Uksung Chemistry PANAK 245 include materials that are excited at wavelengths of 200 nm to 400 nm and are emitted at wavelengths of 400 nm to 700 nm.

In addition, Honeywell Lumilux® CD142 is a material having a characteristic of being excited at a wavelength of 200 nm to 400 nm to be emitted at a wavelength of 700 nm to 1500 nm, and has an upconversion (antistok) fluorescence characteristic of 700 nm to 1600 nm. Materials that are excited at wavelengths and emitted at wavelengths of 400 nm to 700 nm include Honeywell Lumilux® RED UC-6, PHOSPHOR TECHNOLOGY PTIR475 / F, PTIR545,550 / F, and Uksung Chemical UPC-300.

On the other hand, in order to further impart optical and security properties to the fiber, it may further comprise the step of adding a metal component to the master batch.

According to the present invention, in addition to the method of irradiating light of various wavelength range, it is possible to add a metal component to the fiber for the detection through the recent electronic devices, for this, iron, neodymium, cobalt, copper, nickel, or zirconium Metals having isomagnetic properties can be added. The amount of the added metal may be about 0.1% to about 50% by weight of the total fiber, specifically about 0.5% to about 30% by weight, more specifically about 1% to about 20% Weight percent.

In the method of the present invention, the spinning process for producing the fiber refers to a process of fiberizing the master batch mixed with the color expression material and the synthetic resin. The spinning process may be made of fibers of divided sections based on the vertical cross-section of the fiber longitudinal direction. Each compartment may have different characteristics of security, and each compartment is preferably divided into at least two places. In the spinning process, the fibers of the compartment divided into two or more are twisted, resulting in a twisted security fiber that is expressed in two or more colors.

In the method of the present invention, the fibers are twisted and fixed under constant conditions so that two or more colors in the length direction in the length direction in the wavelength range of 0.1 nm to 2000 nm are adjacent to each other and are repeated to provide a security fiber. The process may be carried out in the spinning step of the fiber or in a separate process after the production of synthetic fibers.

Further, in order to further impart optical and security properties to the fiber, the method may further include dyeing or coating the spun fiber. To this end, conventional pigments, pigments having fluorescent properties, or dyes may be added to the outer surface of the fiber through dyeing or coating methods. In particular, as the dyeing properties are changed by different master batches, it can be produced in two or more colors when viewed in the cross section of the fiber. For example, in the form divided into two compartments, one compartment expresses color when irradiated with ultraviolet rays, and the other compartment expresses color in the visible light region in addition to the twisted security fiber which expresses color when irradiated with infrared rays. It is possible to provide a twisted security fiber dyed or coated pigments.

According to one embodiment of the present invention, at least two or more security elements are produced, including fibers can be used in the form of a security sewing thread or may be used in security paper. When used as a security seal, a good fiber can be produced by appropriate surface treatment in the spinning step, that is, by moistening the surface with an alkylamine-based emulsion, antistatic agent, lubricant, and the like. For example, it can be used as a sewing thread of passport paper and in this case, by coating a lubricant on the sewing thread can further improve the thread breakage due to heat generated during sewing. In addition, when continuously included from one end to the other end is preferably inserted in the center in the thickness direction of the paper, in this case it is more preferable to fix to the paper through a constant adhesive treatment.

According to one embodiment of the present invention, a method for applying to a security product, in particular a security paper by cutting the fiber to a certain length by mixing with the pulp at the time of paper manufacturing or continuously from one end to the other end of the security product It can be achieved by including. The length of the fiber to be cut and applied to the predetermined length is preferably 8 mm or less. If the length of the fiber exceeds 8mm, it may be discharged as foreign matter in the screen process for screening foreign matter installed during the paper manufacturing process, which is not preferable in terms of efficiency.

Hereinafter, the present invention will be described in more detail with reference to Examples, but the scope of the present invention is not limited to the following Examples.

Example 1

Two types of masters are prepared by mixing 95% by weight of polyester-based PET (polyethylene terephthalate) resin with 5% by weight of Uksung Chemical PKS 555 as the first security element and 5% by weight of Uksung Chemical PKS 225 as the second security element. Batch was prepared. In the manufacturing process, 400 mesh was used in the filtering of the fluorescent pigment, and the chip size was 1.6 mm in diameter and 3 mm in length. In the spinning step, it was melted and spun in the range of about 240 to 285 ° C., and the final fiber thickness was adjusted to 8 denier. The fiber thus prepared was rewinded with 500 twists per meter and then stabilized at about 120 ° C. for 1 hour. The twist stabilized fiber was cut to 6 mm in length. When the cut fiber was illuminated with an ultraviolet fluorescent lamp, green and red were crossed at intervals of 1 mm. The results are shown in Fig.

Example 2

In Kolon KOPA-PA 6 KN170 resin of 95% by weight polyamide resin, 5% by weight of LUMILUX® CD128 from Honeywell, 5% by weight of CD CD145 as second security element, Three types of master batches were prepared by mixing CD168 in weight percent. It was melt spun and the temperature range was 220 to 245 ° C. The fibers thus prepared were stabilized at about 100 ° C. for 1 hour with 1000 twists per meter applied. This was cut to length 4mm. Blue, green and red color appeared when the cut fiber was illuminated with an ultraviolet lamp.

Example 3

0.1 wt% of the fibers prepared in Examples 1 and 2, respectively, was added to prepare paper, and the basis weight was prepared at 90 g / m 2. Fluorescence characteristics expressed in the fibers in the prepared paper were reproduced in the same manner as in Examples 1 and 2.

Example 4

One master batch was prepared by mixing Kolon KOPA-PA 6 KN170 resin in 95% by weight of polyamide resin with 5% by weight of Honeywell's LUMILUX® CD128 as the first security element, and in 90% by weight of polypropylene resin. Another master batch was prepared by mixing 10% by weight of PHOSPHOR TECHNOLOGY UKL63 as the second security element in Honam Petrochemical SY-140. These were melt spun in the side-side manner at the same ratio and the temperature range was about 220 to 255 ° C. The fibers thus prepared were stabilized at 100 ° C. for 1 hour with 1000 twists per meter applied. Thereafter, the polyamide resin was dyed to a green color through a dyeing process using a light phosphorus Green F-GW acid dye. The fiber thus produced was partially blue when illuminated with an ultraviolet lamp, partially red when illuminated with X-ray light, and partially green when exposed to sunlight. This was applied to the sewing thread of the passport booklet. The results are shown in Fig.

On the other hand, one embodiment of the present invention is not limited to the embodiments described, it is apparent to those skilled in the art that various modifications and variations can be made without departing from the spirit and scope of the present invention. Therefore, such modifications or variations will have to be belong to the claims of the present invention.

Claims (14)

A security fiber composed of a synthetic resin and a color expressing material, and twisted to express two or more colors in a length direction in a wavelength range of 0.1 nm to 2000 nm in a repeated pattern form adjacent to each other. The method according to claim 1,
Fiber characterized in that the length of the at least one color of the two or more colors comprises a range of 50㎛ 10mm. The method according to claim 1,
A fiber having a cross-sectional area of 70 µm ² or more and 0.3 mm ² or less. The method according to claim 1,
The synthetic resin is one selected from the group consisting of polyesters such as polyethylene terephthalate and polybutylene terephthalate, acrylics, polyamides, polyvinyl alcohols, acetates, polypropylenes, polyolefins, polycarbonates, and celluloses. Fiber selected from above. The method according to claim 1,
The fiber is characterized in that it further comprises at least one metal component having a magnetic property selected from the group consisting of iron, neodymium, cobalt, copper, nickel, zirconium. The method according to claim 1,
The fiber comprises at least two or more security elements, the security element has a certain color or fluorescence characteristics, the fiber characterized in that it receives the energy of a specific wavelength and emits the energy of another specific wavelength. Paper comprising a fiber according to any one of claims 1 to 6. Providing at least two master batches of a synthetic resin and a color expressing material,
A fiber manufacturing step of dividing and spinning the respective areas on the cross section of the fiber from the two or more master batches,
Twisting two or more colors in the longitudinal direction in the wavelength range of 0.1 nm to 2000 nm to form a repeating pattern while being adjacent to each other to form a security fiber, and
Method for producing a security fiber comprising the step of applying the fiber in a single material and security products. The method according to claim 8,
The method further comprises adding to the master batch at least one metal component having magnetic properties selected from the group consisting of iron, neodymium, cobalt, copper, nickel, zirconium. The method according to claim 8,
The method further comprises the step of dyeing the fibers. The method according to claim 8,
In the cutting step, the length of the fiber is cut to a predetermined length of 8mm or less. The method according to claim 8,
The twisting is characterized in that the twist is applied 100 to 20000 times per meter. The method according to claim 8,
The color expression material may be used as a fluorescent material, the fluorescent material is a manufacturing method characterized in that the addition of 0.1 to 20% by weight. The method according to claim 8,
The synthetic fibers are selected from the group consisting of polyesters such as polyethylene terephthalate and polybutylene terephthalate, acrylics, polyamides, polyvinyl alcohols, acetates, polypropylenes, polyolefins, polycarbonates, and celluloses. At least one selected method.

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