JP3244953B2 - Information identification sheet and information identification method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information identification sheet and a method for identifying randomness by placing random pattern information on a support, reading or recording the information, and confirming the identity based on the information. And a method for identifying the information.

[0002]

2. Description of the Related Art Conventionally, it has been widely used to record visual information such as characters, pictures, colors, etc. on a support or to record it in the form of magnetic information on a magnetic recording layer to confirm the identity. .

However, since information recorded by such a method is artificially recorded on a support, it is impossible to completely prevent the creation of artificially similar tickets, that is, forgery. there were. For example, a method has been proposed in which information is written with a substance that emits fluorescence, and the fluorescence information is read together with the magnetically recorded information.

[0004]

The above-mentioned method of writing fluorescent information includes writing of character / number information using fluorescent ink,
There is an entry method such as impregnating the entire surface of the sheet with a fluorescent dye and entry using a combination with barcode symbol information.However, if a fluorescent lamp such as a black light can be used, it can be deciphered as long as the fluorescent material is present in any part. The same material can be produced relatively easily by printing with fluorescent ink or by impregnating the entire sheet with a fluorescent dye solution.

Therefore, the present inventors assign different fluorescent information to each of the recording sheets, and even if the fluorescent information is read, it is extremely difficult to create the same fluorescent information pattern. A difficult information identification sheet and a method of identifying the information have been proposed (JP-A-6-8678).
No.).

However, the natural pulp dyed with the water-soluble fluorescent direct dye used in the present invention is inferior in light fastness, and thus loses its fluorescence upon long-term storage or long-term exposure to sunlight. However, it has been found that it has a serious drawback that it is difficult to read it visually and with an optical device. As described above, the fact that the sheet for preventing forgery originally loses its forgery prevention function is not preferable for industrial use, and there is a need for improvement.

[0007]

The present inventor has made intensive studies to solve these problems, and as a result, has come to invent the information identification sheet of the present invention.

That is, the information identification sheet of the present invention is an information identification sheet in which fluorescent strips are internally added so as to form a random pattern in a support, and the fluorescent strips are dyed with a fluorescent disperse dye. JIS made of polyester resin
The fluorescent strip having a color fastness of 4 or more to xenon arc lamp light specified in L0843, and irradiating the information identification sheet with an ultraviolet ray having a wavelength of 200 to 380 nm to thereby form the fluorescent strip in the support. The random pattern of a piece is read or recorded in the form of visible information, and the information of the random pattern can be repeatedly identified.

[0009] In the information identification sheet of the present invention,
By providing a magnetic recording layer or a heat-sensitive recording layer on the back surface of the support, multifunctionality as an information identification sheet can be exhibited.

Further, the information identification method using the information identification sheet of the present invention is characterized in that the dyeing fastness to a xenon arc lamp light class 4 or more specified in JIS L0843 comprising a polyester resin dyed with a fluorescent disperse dye. An ultraviolet ray having a wavelength of 200 to 380 nm is irradiated to the information identification sheet in which the fluorescent strip is internally added so as to form a random pattern in the support, and the random pattern of the fluorescent strip in the support is visible information. The random pattern is read or recorded, and the information of the random pattern is repeatedly identified.

Hereinafter, the information identification sheet of the present invention will be described.
This will be described in detail.

Various fluorescent disperse dyes are used as the substance that emits fluorescence upon irradiation with ultraviolet light used in the present invention. For example, benzoxazole derivatives, styrylbenzoxazole derivatives, pyrene derivatives, mixtures of pyrene and oxazole derivatives, coumarin derivatives, benzimidazole derivatives, pyrazoline derivatives, aminocoumarin derivatives, and the like can be used, but the present invention is not limited thereto. Not something.

JIS L0843 referred to in the present invention
Fastness to xenon arc lamp light specified in 4
With a fluorescent strip of a grade or higher, for example, the above-described fluorescent disperse dye and a polyester derivative, an acetate derivative, a triacetate derivative, or the like processed into a fibrous or strip shape, etc., are heated and stirred in water as usual. Refers to strips in which the fluorescent disperse dye is dyed and diffused in the resin.

It is not certain why the dyeing fastness of the fluorescent strip thus adjusted is as excellent as the dyeing fastness to xenon arc lamp light class 4 or more specified in JIS L0843, but it is not clear from the beginning. A dye having a skeleton excellent in light resistance is adsorbed in segments of a polyester resin having high affinity in a state of being dispersed in a micron order,
It is presumed that the diffusion takes a structure as if the fluorescent dye is incorporated in the resin in the form of particles.

Next, as a method of internally adding the fluorescent strips to the support, a method of adding the strips during the production of the support from the viewpoint of drawing a random pattern as referred to in the present invention. Preferably, a method in which the fluorescent strip is mixed with pulp as a support is preferred.

Although the reason for this is not certain, it is because a sheet is formed in a pulp serving as a support in a sparsely dispersed state in a papermaking process. This is based on the fact that the size, stiffness, arrangement and the like of paper fibers become non-uniform. Therefore, the same pattern does not exist in any part, and there is no single identical pattern like a human fingerprint, and it can be called a "paper pattern" encoded for each information identification sheet.
By reading such a “paper pattern”, ie, fluorescent information composed of a random pattern for each information identification sheet, it is possible to compare the random pattern differences and check whether the information recording sheets are the same. It becomes possible.

In the case of the mixing method, in order to efficiently collect the fluorescent strips on the surface layer, a technique of mixing can be used. The production of this laminated paper is performed using a paper machine such as a round paper machine, a fourdrinier paper machine, a twin wire paper machine or the like.

As a method of reading or recording the fluorescent information, for example, a fluorescent lamp such as a black light is used.
Fluorescence information is converted into visible information and read, and the pattern is recorded as analog information such as taking a picture, or by irradiating ultraviolet light of a certain wavelength, the fluorescence spectrum is read, and digitally recorded as peak information of a certain intensity or more There is a method to do. In the case of an information identification sheet provided with a magnetic recording layer, the fluorescent information is recorded as magnetic information on the magnetic recording layer, so that even if the magnetic information is forged, the fluorescent information on the sheet must match. For example, forgery can be completely prevented by constructing a detection system that can repel this.

In the case of an information identification sheet provided with a heat-sensitive recording layer, a similar detection system can be constructed by recording the fluorescent information in an encrypted form on the heat-sensitive recording layer. It is.

Regarding the shape and size of the fluorescent strip,
An information identification sheet internally containing the fluorescent strip of the present invention,
The sheet is not particularly limited as long as it does not impair the surface flatness, printability, appearance, and the like, which are the basic properties of the sheet.

Regarding the internal amount of the fluorescent strip, regardless of the reading method, in any case, as long as at least one fluorescent strip exists in the reading range, Identification of identity with other sheets is possible. This is because, as described above, the position of each of the strips emitting fluorescent light on the sheet, or the size of the fluorescent strip, etc., are completely uncertain, and the fluorescent light is temporarily set within the reading range. Even if there is only one emanating strip,
By reading information such as where the fluorescent strips are located on the scanning line or on the surface, identification of identity with other sheets can be sufficiently performed.

As the support used in the present invention, paper is mainly used, but non-woven fabric, plastic film, synthetic paper, metal foil and the like are used, and fluorescent strips can be added during production. If it is a thing, it is not limited. Further, the use of the information identification sheet of the present invention bonded to paper, nonwoven fabric, plastic film, synthetic paper, metal foil or the like is not limited at all.

[0023]

The information discrimination sheet of the present invention is an information discrimination sheet in which fluorescent strips are internally added so as to form a random pattern in a support, and the fluorescent strips are dyed with a fluorescent disperse dye. JIS L084 made of polyester resin
This is a fluorescent strip having a color fastness to class 4 or higher against xenon arc lamp light specified in 3. The light fastness of the fluorescent label is remarkably improved as compared with the information identification sheet previously proposed by the present inventors. By irradiating the information identification sheet with ultraviolet light having a wavelength of 200 to 380 nm even after being stored for a long period of time or being exposed to light for a long period of time, The random pattern of the strip is recorded as visible information and can be identified by repeating the recording of the random pattern, and the random pattern disappears for every one of the information identification sheets, as if it were a human fingerprint. Because it is encoded as a "paper print" without any problem, it becomes extremely difficult to forge, and at the same time, it is possible to provide reliability that the paper print will never disappear That. For the above reasons, the information identification sheet of the present invention has an action not seen in the conventional technology.

[0024]

EXAMPLES The present invention will be described in more detail with reference to the following Examples, but it should not be construed that the present invention is limited thereto.
Incidentally,% in the examples indicates% by weight.

Example 1 [Preparation of fluorescent strip] Polyester film (width 300
μm, length 4 mm, thickness 15 μm) and 1 g of a fluorescent disperse dye (manufactured by Ciba-Geigy Co., Ltd., Ubitex ERN)
0.1 g of (benzoxazole derivative)), 100 ml of water is further added, and the mixture is heated, stirred, and cooled for 1 hour in a boiling state, filtered, washed with water several times, and dyed with a fluorescent disperse dye. Adjust the polyester film.

[Preparation of Information Identification Sheet] Freeness 40
100 g of hardwood bleached pulp beaten to 0 ml was adjusted to a 2% concentration slurry. While stirring this slurry, 1 g of the polyester film dyed with the above fluorescent disperse dye was added thereto, and stirring was further continued. Using this pulp, papermaking was carried out to a basis weight of 150 g / m ^{2 as} usual,
Dry at 05 ° C and remove 1% of the strips dyed with fluorescent dye
The contained information identification sheet A was obtained. This information identification sheet was only recognized as white, which is the background of the sheet itself under normal sunlight, but under irradiation of ultraviolet light by black light, a random pattern of the dyed strip was formed. The fluorescent pattern could be identified. Further, as a result of scanning one line on the paper surface by a CCD line sensor camera under black light irradiation on the information identification sheet, a random pattern based on the fluorescent light-emitting strips in the information identification sheet could be captured.

Example 2 The polyester film of Example 1 was made of the same polyester having a width of 100 μm, a length of 3 mm and a thickness of 10 μm, and the fluorescent disperse dye was changed to Ubitex EMT (manufactured by Ciba Geigy, pyrene and oxazole). Except for using a mixture of derivatives), an information discrimination sheet B was obtained in the same manner as in Example 1, and one line was scanned by a CCD line sensor camera in the same manner as described above. Based on the random pattern.

Comparative Example 1 [Preparation of Fluorescent Strips] To 1 g of softwood pulp, 0.1 g of a fluorescent direct dye (manufactured by Ciba Geigy Co., Ltd., Tinopearl UP (diaminostilbene disulfonic acid derivative)) was added, and water was further added. After adding 100 ml and stirring at room temperature for 1 hour, the pulp is filtered and washed with water several times to prepare softwood pulp dyed with a fluorescent direct dye.

[Preparation of Information Discrimination Sheet] In the same manner as in Example 1 except that the polyester film dyed with the fluorescent disperse dye of Example 1 was replaced with softwood pulp dyed with the above fluorescent direct dye. Thus, the information identification sheet C was obtained, and one line was scanned by the CCD line sensor camera in the same manner, and a random pattern based on the fluorescent pulp in the information identification sheet could be captured.

Comparative Example 2 An information discrimination sheet D was obtained in the same manner as in Comparative Example 1 except that the softwood pulp of Comparative Example 1 was replaced with strip-shaped regenerated cellulose fibers (width 300 μm, length 5 mm, thickness 10 μm).
Similarly, one line was scanned by a CCD line sensor camera, and a random pattern based on the fluorescent fibers in the information identification sheet could be captured.

[Evaluation Method] The method for evaluating the light fastness is described in J.
According to the test method specified in IS L0843, the color fastness to xenon arc lamp light is determined, and the CC
The same line as before the test is scanned by a D-line sensor camera, and a random pattern based on the fluorescent strips in the information identification sheet after the exposure test is taken in. The four main peaks in each information identification sheet are obtained by the following equation (1). , The residual ratio of the fluorescence intensity was calculated, and the results are shown in Table 1.

[0032]

(Equation 1)

[0033]

[Table 1]

[0034]

As shown in Table 1 and FIGS. 1 to 4,
The information identification sheet of the present invention, when irradiated with light of a specific excitation wavelength such as black light, has a random pattern of fluorescent light based on fluorescent strips dyed by a fluorescent disperse dye internally added to the support. It is possible to identify whether the color is the same as the initially read random pattern even after the color is read and stored for a long time or after being exposed to light for a long time. That is, the "paper pattern" characterized by each information identification sheet is not only difficult to forge but also does not disappear for a lifetime like a fingerprint, and has an excellent counterfeit prevention effect. Further, the information identification method is an effective method that has never been used as a method of preventing forgery, and its practical value is extremely high.

[Brief description of the drawings]

FIG. 1 is an information identification sheet A obtained in Example 1 of the present invention.
5 is a fluorescence spectrum showing the fluorescence intensity and distribution of the sample.

FIG. 2 is an information identification sheet A obtained in Example 1 of the present invention.
4 is a fluorescence spectrum showing the fluorescence intensity and distribution state after an exposure test using a xenon arc lamp.

FIG. 3 is a fluorescence spectrum showing the fluorescence intensity and distribution state of the information identification sheet D obtained in Comparative Example 2 outside the present invention.

FIG. 4 shows a fluorescence intensity of the information identification sheet D obtained in Comparative Example 2 outside the present invention after an exposure test using a xenon arc lamp.
It is a fluorescence spectrum showing a distribution state.

Claims (4)

(57) [Claims] 1. An information identification sheet in which fluorescent strips are internally added so as to form a random pattern in a support, wherein the fluorescent strips are made of a polyester resin dyed with a fluorescent disperse dye. The fluorescent strip having a color fastness of 4 or more to xenon arc lamp light specified in L0843, and irradiating the information identification sheet with an ultraviolet ray having a wavelength of 200 to 380 nm to thereby form the fluorescent strip in the support. An information identification sheet for making a random pattern of a piece visible and reading or recording the information, wherein the information of the random pattern can be repeatedly identified. 2. The information identification sheet according to claim 1, wherein a magnetic recording layer is provided on the back surface of the support. 3. The information identification sheet according to claim 1, wherein a heat-sensitive recording layer is provided on the back surface of the support. 4. Fluorescent strips having a color fastness of class 4 or higher against xenon arc lamp light defined by JIS L0843 comprising a polyester resin dyed with a fluorescent disperse dye are formed into a random pattern in a support. The information identification sheet internally added to the substrate is irradiated with ultraviolet light having a wavelength of 200 to 380 nm, and the random pattern of the fluorescent strip in the support is visualized and read or recorded, and the information of the random pattern is repeated. An information identification method for an information identification sheet, characterized by identifying.