JP3473441B2 - Anti-counterfeit paper - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to papers used for securities of various kinds that require anti-counterfeiting, and more specifically, anti-counterfeit papers that can be easily judged to be authentic without using any special equipment. It is about.

[0002]

2. Description of the Related Art As a means for preventing forgery, forgery using an optical means such as a color copier by printing a micro character, attaching a hologram sticker, inserting a strip, or combining these methods. ,
It prevents tampering, and also makes it easy for an amateur to judge that it has been forged or tampered with.

The above-described method of filtering the strip is used for US dollar bills and the like. As the strip to be inserted into the US dollar bill, one in which a pattern such as characters is formed by etching or hot stamping after depositing aluminum on a transparent film is used. It is said that the watermark pattern of the design can be confirmed by seeing through the transmitted light the bills that have been inserted. However, this method using aluminum has drawbacks that the manufacturing cost is higher than that in which a pattern is formed by a printing method and that disposal is difficult.

It has also been proposed that a strip having a pattern such as characters printed with black ink on a transparent film is inserted. However, since the pattern of this product is visible even when viewed normally, a similar appearance can be obtained by simply printing with gray ink on the paper, and the anti-counterfeiting effect is weak.

[0005]

DISCLOSURE OF THE INVENTION The present invention has a high forgery prevention effect and is a banknote which is easy for an amateur to judge whether it is true or false.
It is an object to provide anti-counterfeit paper suitable for securities such as gift certificates, stock certificates, checks and bills.

[0006]

As an invention made to solve the above problems, the invention according to claim 1 is
The anti-counterfeit paper is characterized in that a strip having a pattern printed with a white ink having high concealing property including titanium white is squeezed into a pulp base paper on a transparent support film.

Further, the invention according to claim 2 is the anti-counterfeit paper according to claim 1, wherein the width of the strip on which the design is printed with the white ink having a high concealing property is 1 to 5 mm.

The invention according to claim 3 is the anti-counterfeit paper according to claim 1 or claim 2, wherein the transparent support film has a thickness of 10 to 35 µm.

Further, the invention according to claim 4 is characterized in that a strip having a pattern printed thereon with an ink in which a fluorescent coloring agent is mixed in the white ink having a high hiding property is put into a pulp base paper. The anti-counterfeit paper according to any one of claims 1 to 3.

The invention according to claim 5 is the anti-counterfeit paper according to any one of claims 1 to 4, wherein the transparent support film is a biodegradable film.

Furthermore, the invention according to claim 6 is characterized in that the biodegradable film according to claim 5 is a lactic acid resin.
The anti-counterfeit paper according to any one of 1.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below with reference to the drawings. 1A and 1B are schematic diagrams when a gift certificate is produced with the anti-counterfeit paper of the present invention. FIG. 1A is an external front view, and FIG. 1B is a see-through pattern when seeing it through transmitted light. (C)
[Fig. 3] is a cross-sectional view showing a state in which a strip is inserted.
In FIG. 1 (A), a strip (20) is embedded in a base paper (12) which is embedded in the base paper (12), and it is not known where the strip (20) is embedded when viewed from the front. When it is watermarked with transmitted light, the pattern such as characters printed on the strip can be recognized.

The strip (20) is printed on the transparent support film (22) with a white ink containing titanium white, which has a high concealing property, by a conventional printing method such as gravure printing or offset printing. The printed support film is slit with a slitter in a width range of 1 to 5 mm to prepare a strip as shown in FIG. Here, if the width is 1 mm or less, it is difficult to recognize the pattern when seeing through the watermark, and if it is 5 mm or more, the securities may be curled or wavy due to the difference in expansion / contraction ratio between the base paper and the film. Therefore, a width of about 1.5 mm is suitable.

The material used as the support film (20) is not particularly limited, and polyethylene terephthalate (PET), polyvinyl chloride (PV)
C), polypropylene (PP), polyethylene (PE)
A general-purpose resin film such as is used. Among these, polyethylene terephthalate (PET), which is a polyester excellent in heat resistance, tensile strength and rigidity, is preferable. Further, the thickness is suitably 10 to 35 μm, and if it is thinner than this, the suitability for printing and cutting into the base paper is poor and the workability is impaired. In addition, if the thickness is increased, the material cost becomes high, and the place where the strip is swelled rises, so that the person who tries to forge the place knows where the strip was sewn and the anti-counterfeiting effect is diminished. In addition, when counting the number of people by mechanical processing, it gets caught.

The pattern is printed with the white ink so that the base paper is white so that it cannot be seen by the normal reflected light. If the design is printed with the color ink, the pattern is printed on the base paper. However, the color becomes light, but it is visible in the reflected light. This is the same in appearance as when printed on the base paper with a similar light color, and the anti-counterfeiting effect is diminished.

The pattern (24) such as characters to be printed is shown in FIG.
Print with a simple design as shown in (A), or
A white pattern may be used as in (B). When a white pattern is seen through with transmitted light, the pattern is often easier to recognize.

Further, the white ink is mixed with a fluorescent substance.
If you let it go, a light source that contains infrared rays or ultraviolet rays in the transmitted light
Watermarking makes it easier to distinguish and at the same time counterfeit prevention effect
Will be increased. Y as a substance that develops color with infrared rays
F₃: YB, Er, ZnS: CuCo, LiNd_{0 ・ 9}Y
b_0.1P_FourO₁₂, LiBi_0.2Nd_0.7Yb_0.1P_FourO
₁₂, Nd_{0 ・ 9}Yb_0.1Nd_Five(MoO_Four)_Four, NaNb
_0.3Yb_0.1P_FourO₁₂, Nd_0.8Yb_0.2Na_Five(W0
_Four)_Four, Nd_0.8Yb_0.2Na_Five(Mo_0.5WO_0.5)
_Four, Ce_0.05Gd_0.05Nd_0.75Yb_0.25Na_Five(W_0.7
Mo_0.30_Four) _Four, Nd_0.3Yb_0.1Al₃(BO₃)
_Four, Nd_{0 ・ 9}Yb_0.1Al_2.7Cr_0.3(BO₃)_Four,
Nd_0.4P_FiveO_Four, Nd_0.8Yb_0.2K₃(PO_Four)₂
As a substance that develops color with ultraviolet rays, Ca is₂B_Five
O₃Cl: Eu²⁺, CaWO_Four, ZnO: Zn₂SiO
_Four: Mn, Y₂O₂S: Eu, ZnS: Ag, YV
O_Four: Eu, Y₂0₃: Eu, Gd₂O₂S: Tb, L
a₂O₂S: Tb, Y₃Al_FiveO₁₂: There is Ce and the like.

When a biodegradable film is used as the transparent support film (22), the plastic part is not decomposed and remains, and the plastic part is not cut off even when the paper is recycled. It also makes it easier to recycle.

As the biodegradable film, there is a lactic acid resin. Since lactic acid has a hydroxyl group and a carboxy group in the molecule, it can be polycondensed, and a lactic acid resin can be obtained by reacting glycolic acid, tartaric acid, malic acid, hydroxycaproic acid, polyethylene glycol or the like. This lactic acid-based resin is a resin that can be biodegraded. Although lactic acid-based resin does not have sufficient rigidity, it is biaxially stretched so that conventional polyester resins have rigidity, mechanical properties such as durability, mechanical strength, hardness, dimensional stability, and bending resistance. , Will have the same characteristics as vinyl chloride resin.

A strip on which a pattern is printed on this resin is put into a base paper to produce an anti-counterfeit paper. This prevents the strip on which the pattern is printed from being disassembled and left when it is discarded after use.

As described above, the lactic acid-based resin is obtained by polycondensing hydroxyl groups or carboxy groups in the molecule with glycolic acid, tartaric acid, malic acid, hydroxycaproic acid, polyethylene glycol, etc. Easily hydrolyzes in aqueous solution.

This is convenient for recycling paper. When the pulp is regenerated, if it is treated with an aqueous solution of several percent sodium hydroxide, it is hydrolyzed within several hours, and only the pulp can be separated. Therefore, when recycling the paper, it is not necessary to cut off the transparent support film in advance for separation.

The base paper (12) is bleached softwood kraft pulp (NBKP), bleached hardwood kraft pulp (LBKP),
Softwood bleached sulfite pulp (NBSP), thermomechanical pulp (TMP), and other paper-making pulp are mainly used, and dry paper strength enhancer, wet paper strength enhancer, sizing agent, fixing agent, retention aid, drainage improvement An anti-counterfeit paper may be prepared by using a known paper machine such as a Fourdrinier paper machine and a cylinder paper machine while feeding a strip, using an agent, an antifoaming agent and the like as appropriate. If necessary, machine calendering treatment or super calendering treatment may be performed to improve the surface smoothness.

[0024]

In the anti-counterfeit paper of the present invention, nothing can be seen from a normal point of view, but the pattern printed on the strip can be confirmed by observing it with transmitted light so that the authenticity can be easily judged. Further, since the strip is completely embedded in the base paper and set in, the person who does not know this cannot suppress the forgery and falsification by not being able to recognize that the anti-counterfeiting means has been taken.

Further, the manufacturing cost is reduced as compared with the method of forming a pattern by etching the aluminum vapor deposition layer.

In addition, by using a biodegradable lactic acid-based resin film for the strip, even if it is discarded after use, only the strip portion does not remain without being decomposed, and an environmentally friendly anti-counterfeit paper is provided. can do. Moreover, since the lactic acid-based resin film is hydrolyzed, it is easy to separate it from the pulp component, and there is an effect that the recyclability is equivalent to that of ordinary paper.

[Brief description of drawings]

1A and 1B are schematic diagrams when a gift certificate is produced with the anti-counterfeit paper of the present invention, where FIG. 1A is an external front view, and FIG. 1B is an external front view when this is seen through with transmitted light. (C) is a cross-sectional view showing a state in which the strip has been inserted.

FIG. 2 is a front view of a strip on which a design such as a character is printed, (A) shows a case where the design is simply put on the strip, and (B) is a front view when the design is printed with an outline. Is.

[Explanation of symbols]

10 ... Securities 12 ... Base paper 20 ... strip 22 ... Transparent support film 24 ... Design

Claims (6)

(57) [Claims] 1. Titanium white on a transparent support film
An anti-counterfeit paper, characterized in that a strip on which a pattern is printed with a highly concealing white ink containing is woven into a pulp base paper. 2. The anti-counterfeit paper according to claim 1, wherein the width of the strip on which the pattern is printed with the white ink having a high concealing property is 1 to 5 mm. 3. The thickness of the transparent support film is 10 to 3
The anti-counterfeit paper according to claim 1, which has a thickness of 5 μm. 4. A strip base on which a pattern is printed with an ink in which a fluorescent coloring agent is mixed in the white ink having a high hiding property is squeezed into a pulp base paper.
The anti-counterfeit paper according to item 1. 5. The anti-counterfeit paper according to any one of claims 1 to 4, wherein the transparent support film is a biodegradable film. 6. The anti-counterfeit paper according to claim 1, wherein the biodegradable film according to claim 5 is a lactic acid resin.