JP3138064B2 - Information identification sheet - 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 on which random pattern information is placed in a support, the information is read or recorded, and the identity is confirmed by 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 them 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 magnetic recording information.

[Problems to be solved by the invention]

The above-mentioned methods for writing fluorescent information include writing methods such as writing character / number information using fluorescent ink, impregnating the entire surface of the sheet with a fluorescent dye, and writing in combination with bar code symbol information. By using a fluorescent lamp such as a black light, as long as it is possible to decipher which part of the fluorescent material is present, by means of printing using fluorescent ink or impregnating the entire sheet with a fluorescent dye solution, It is relatively easy to make the same thing. Therefore, the technical problem of the present invention is that the recording sheet 1
An object of the present invention is to provide an information identification sheet in which different pieces of fluorescent information are given to each sheet, and it is extremely difficult to create the same fluorescent information pattern even if the fluorescent information is read.

[0005]

Means for Solving the Problems The present inventors have conducted intensive studies to solve these problems, and as a result, the information discrimination sheet of the present invention is obtained by dyeing or impregnating a support with a fluorescent dye or pigment. Alternatively, an information identification sheet obtained by applying a surface sizing agent containing a synthetic pulp, wherein the pulp is present in a random pattern on the surface of the support coating layer, and the information identification sheet has a thickness of 200 to 380 nm. By irradiating with ultraviolet light having a wavelength of the following, the random pattern of the pulp in the support is visualized and read or recorded, and the information of the random pattern can be repeatedly identified.

Further, a surface sizing agent containing natural or synthetic pulp dyed or impregnated with a fluorescent dye or pigment is coated on a support in an amount of 0.1 to 3.0 g / m ^2. It is assumed that.

Further, the information identification sheet provided by the present invention has a support in which a magnetic recording layer mainly composed of ferromagnetic magnetic powder is coated on a surface opposite to a surface on which information can be identified. It may be something.

In the present invention, when a coating layer comprising the pulp and the surface sizing agent is provided on the support, the pulp is present as a random pattern on the surface layer of the support. It is obtained and can be identified as a clear pattern. On the other hand, a method in which the pulp is internally added to the support may be used, but in this case, the identification efficiency is poor because the pulp straddles the front, middle and back surfaces of the support. As described above, when a coating layer is provided on the support of the present invention, only a small amount of the pulp may be applied since the pulp is present only in the surface layer.

In the present invention, as a coating layer component coated on a support, a natural or synthetic pulp dyed or impregnated with a surface sizing agent and a fluorescent dye or pigment used in a normal papermaking process is used as a main component. It is assumed that. The mixing ratio between the surface sizing agent and the pulp depends on the amount of the pulp to be applied, and is not particularly limited. The upper limit is an amount at which the pulp can be adhered to the support by the surface sizing agent.

[0010] As the surface sizing agent, rosin, alkyd resin, styrene resin, olefin resin, acrylic resin, oxidized starch, cationized starch, carboxymethyl cellulose, polyvinyl alcohol, acrylamide, alkenyl succinic anhydride, alkyl ketene dimer Styrene-acrylic copolymer, diisobutylene-maleic anhydride copolymer, styrene-maleic anhydride copolymer, and the like. Among these surface sizing agents,
A type which can fix the pulp to the support, that is, has both of the adhesive properties at the same time is preferable. When a surface sizing agent having no adhesiveness is used, a commonly used aqueous binder may be used in combination.

Various fluorescent dyes and pigments are used as the substance which emits fluorescence upon irradiation with ultraviolet light used in the present invention. For example, as a fluorescent dye, a diaminostilbene disulfonic acid derivative, an imidazole derivative, a coumarin derivative and the like are mainly used. However, the present invention is not limited to these.

As fluorescent pigments, CaS: Bi, Sr
S: Sm: Ce, ZnS: Ag, ZnS: Cu, Zn
S: Sulfide based on Cu: Co, Sr ₅ (PO ₄ ) 3C
l: Eu, 3 (Ba, Mg) · 8Al 2 O 3: Eu, Zn
O: Zn, Zn ₂ SiO ₄ : Mn, Zn ₂ GeO ₄ : Mn,
YVO ₄ : Eu, Y ₂ O ₂ S: Eu, 0.5MgF ₂ .3.
Oxygenates based on 5MgO.GeO ₂ : Mn are used, but the present invention is not limited to these.

The natural or synthetic pulp used in the present invention includes NBKP, LBKP, NBSP, LBSP, G
Examples include natural pulp such as P and TMP, and synthetic pulp such as polyamide, polyvinyl alcohol, polyvinylidene chloride, polyvinyl chloride, polyacrylonitrile polyester, polyethylene, polypropylene, and polyurethane.

By using the above fluorescent dyes and pigments and dyeing or impregnating natural or synthetic pulp in a conventional manner, the pulp emitting fluorescence used in the present invention can be obtained.

As a method for applying a coating component comprising a natural or synthetic pulp impregnated or impregnated with the fluorescent dye / pigment thus prepared and a surface sizing agent onto a support, a size press coating method is used. Construction equipment is most suitable. However, a coating method using a coating machine such as an air knife coater, a rod coater, a gravure roll coater, and a curtain coater can be appropriately used depending on the purpose.

The coating layer coated on the support has natural or synthetic pulp dyed or impregnated with a fluorescent dye or pigment dispersed in a random pattern on the surface of the coating layer. Nothing indicates the pattern.

The reason for this is not certain, but during the coating process, natural or synthetic pulp dyed or impregnated with a fluorescent dye or pigment on a support is formed in a sparsely dispersed state. This is based on the fact that the size, stiffness, arrangement and the like of the paper fibers become non-uniform. Therefore, the same pattern does not exist in any part, and there is no identical one like a fingerprint of a human, and the “paper pattern” encoded for each information identification sheet is used.
It can be said that. By reading such "paper pattern", that is, fluorescence information composed of a random pattern for each information identification sheet, it is possible to compare the random pattern differences and confirm whether or not the information recording sheets are the same. It becomes possible.

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 are ways to do that. In the case of an information identification sheet provided with a magnetic recording layer, by utilizing such fluorescent information, even if the magnetic information is forged, if the fluorescent information of the sheet does not match, this is repelled. By constructing a simple detection system, forgery can be completely prevented.

Regarding the content of the pulp dyed or impregnated with the fluorescent dye / pigment, irrespective of the reading method, at least one of the fluorescent dye / pigment is within the reading range in any case. If there is the pulp dyed or impregnated with the pulp, the identity of the pulp with other sheets can be identified. This is because, as described above, the position where each of the pulps emitting fluorescence on the sheet is present, or the size of the pulp, etc., are completely uncertain. Even if there is only one piece, by reading information such as where the fluorescent pulp is on the scanning line or on the surface, identification of the identity with other sheets is sufficiently possible.

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. Is not limited as long as it can apply a synthetic pulp. Also,
There is no particular limitation on the use of a non-woven fabric, a plastic film, synthetic paper, a metal foil, or the like that is bonded to the non-woven fabric. Incidentally, the paper as a support may contain a fluorescent dye,
In the present invention, within the range that can be clearly identified,
There is no particular limitation.

[0021]

The information discrimination sheet of the present invention is obtained by coating a support with a surface sizing agent containing a natural or synthetic pulp dyed or impregnated with a fluorescent dye or pigment, whereby the pulp has a random pattern. The information identification sheet is present on the surface of the support coating layer as described above.
By irradiating an ultraviolet ray having a wavelength of nm, the random pattern of the pulp in the support is recorded as visible information, and the recording of the random pattern can be repeatedly identified, and the random pattern is the information identification sheet. Each sheet is coded as a "paper print" like a human fingerprint, making it extremely difficult to forge. For the above reasons, the information identification sheet of the present invention has an action not seen in the conventional technology.

[0022]

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 1 100 parts of a mixture of LBKP and NBKP having a weight ratio of 7: 3 beaten to a freeness of 350 ml was mixed with 100% of precipitated calcium carbonate (trade name: TP- 12
1. Okutama Kogyo Co., Ltd.), Alkyl Ketene dimer sizing agent (trade name: Harcon W, Dick Hercules)
And 0.1 part of a cationic starch (trade name: Kate F, manufactured by Oji National Co., Ltd.).
A base paper of 50 g / m ² was produced. Subsequently, using the produced base paper, a broadleaf bleached pulp dyed with a fluorescent dye comprising a diaminostilbene disulfonic acid-based compound and polyvinyl alcohol in a size press device in a ratio of 1: 9.
Was applied using an aqueous coating solution of 2% surface sizing agent mixed at a mixing ratio of 0.3 g / m ² to obtain an information identification sheet. Here, the pulp dyed with the fluorescent dye is provided in a coating layer of the support at 0.03 g / m ² . The obtained information identification sheet was only recognized as white, which is the background of the sheet itself under normal sunlight, but under ultraviolet irradiation by black light, a random pattern of the dyed pulp was used. Could be identified. Further, in order to measure the fluorescence intensity and the distribution state of the two random patterns of the obtained information identification sheet, the fluorescence under 350 nm ultraviolet irradiation was measured using a chromatoscanner CS-9000 manufactured by Shimadzu Corporation. The spectrum was measured. FIG. 1 shows the measurement results.

Comparative Example 1 In place of the base paper used in Example 1, the pulp dyed with the fluorescent dye used in Example 1 during the mixing of the base paper was 0.02%.
And a base paper having a basis weight of 150 g / m ² was produced. The base paper (that is, the information identification sheet) obtained here contains the pulp with substantially the same amount of the information identification sheet of Example 1. The fluorescence spectrum was measured in the same manner as in Example 1. FIG. 2 shows the measurement results.

Comparison of the measurement results of Example 1 and Comparative Example 1 with the fluorescence spectra of FIGS. 1 and 2 shows that:
In the case of FIG. 1, it is apparent that the fluorescence intensity is clearly higher than that of FIG. Thus, the results of Example 1 can be clearly identified even if the pulp content is low, if the pulp is present on the surface of the support.

[0026]

The information discrimination sheet of the present invention, when irradiated with light of a specific excitation wavelength such as black light, is dyed or impregnated with a fluorescent dye or pigment coated on a support. By reading the fluorescent color of the random pattern based on the synthetic pulp, it is possible to identify whether the random pattern is the same as the random pattern read at the beginning. That is, the "paper pattern" characterized by each information identification sheet is extremely difficult to forge, has an excellent anti-counterfeit effect, and has a very high practical value.

[Brief description of the drawings]

FIG. 1 is a fluorescence spectrum showing the fluorescence intensity and distribution state of sheet A obtained in Example 1.

FIG. 2 is a fluorescence spectrum showing the fluorescence intensity and distribution state of sheet B obtained in Comparative Example 1.

Continuation of front page (56) References JP-A-55-122100 (JP, A) JP-A-2-293500 (JP, A) JP-A-6-8679 (JP, A) JP-A-6-8678 (JP) JP-A-58-91893 (JP, A) JP-A-4-82797 (JP, A) JP-A-4-63281 (JP, U) JP-A-4-52077 (JP, U) Field surveyed (Int.Cl. ⁷ , DB name) G11B 5/80 G11B 7/24 B42D 15/00-15/10 D21H 21/40-21/48 G06K 19/10-19/18

Claims (3)

(57) [Claims] 1. A support is coated with a surface sizing agent containing a natural or synthetic pulp dyed or impregnated with a fluorescent dye or pigment, and the pulp forms a random pattern on the surface of the coating layer of the support. It is an information identification sheet that exists as described above, and by irradiating the information identification sheet with ultraviolet light having a wavelength of 200 to 380 nm, the random pattern of the pulp in the support is visualized and read or recorded. An information identification sheet characterized in that the information of the random pattern can be repeatedly identified. 2. A surface sizing agent containing a natural or synthetic pulp dyed or impregnated with a fluorescent dye or pigment is coated on a support at 0.1 to 3.0 g / m ^2. Information identification sheet. 3. The information identification sheet according to claim 1, wherein a magnetic recording layer is provided on the back surface of the support.