JPH03230996A - Forgery judging paper - Google Patents

Abstract

PURPOSE:To together provide the function as fancy paper making a fluorescent image visible and having forgery preventing properties and a watermark printing pattern by printing an image on the surface layer of paper wherein a layer containing a fluorescent reactive substance is provided directly under coated paper, paper or cardboard using transparentizing ink and irradiating the printed surface with ultraviolet rays. CONSTITUTION:A layer composed of either one of pulp, paint coat, resin coat or printing containing a fluorescent reactive substance is formed as the under layer of a paper and pulp, an opaque layer or a printing layer showing no fluorescent reaction is arranged on the upper surface thereof as the surface layer by an amount capable of transparentizing the paper up to the fluorescent dye added layer of the under layer by the printing of watermark ink and the surface layer is transparentized by applying watermark printing and the fluorescent reactive substance-containing layer constituted in the under layer is exposed and a printed image not discrimination from mere water mark printing from appearance but emitting bluish purple visible light at the time of the irradiation with ultraviolet rays is formed and forgery judging function is added to watermark printing as fancy paper.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention is applicable to products such as various securities papers, gift certificates, important documents, etc., which can cause great damage if they are forged, and packaging containers that can be forged and damaged. This paper relates to counterfeit identification paper used for packaging paper, etc., which may be subject to falsification.

(Prior technology) Traditionally, paper has been widely used to prevent counterfeiting by blending colored fibers, printed paper pieces, and distinguishable substances into paper and using specially made paper, and paper with watermarks and patterns has been widely used. It has been used as anti-counterfeiting paper. In particular, the method of adding watermark characters and patterns to paper is to press a dungeon roll on which characters and patterns are provided during the papermaking process, to add thickness to the fibers that make up the paper stock, and to apply watermarks between the mark roll and the elastic roll. The embossing method, in which letters or patterns are applied to paper by pressing, is widely known and has been used as paper to prevent forgery.

(Problem M to be solved by the invention) As stated above, anti-counterfeiting paper that incorporates colored fibers, printed paper pieces, or identifiable substances during the papermaking process may not satisfy customers depending on its use. Instead, the method of adding watermark letters and patterns during the papermaking process uses a cutter that optically senses the watermark pattern with a sensor and cuts it in register in order to place the text pattern in a fixed position on the final product, which has various dimensions. Since there is generally no such method, there is not only the disadvantage that it is economically and technically difficult, but also the paper manufacturing lots are usually large, which conflicts with the demands of customers who desire small lots and a wide variety of products. As a means to solve these problems, namely, the problem of having a wide variety of small lofts and arranging watermark letters and patterns in fixed positions, a method of applying watermark patterns using chemical solutions has recently been developed and used. However, many such methods have already been proposed through patents, utility models, etc., and they also have the disadvantage that they can be easily forged by printing, etc., and there is a need for a counterfeit identification paper that can be identified only by consumers. I've started to feel that way.

The present inventors have proposed that, as a method to solve the problem of (H) above, paper printed using an ink containing a fluorescent dye added to a transparent watermark ink can be used to create a fluorescent image by irradiating it with ultraviolet rays. We developed a visible counterfeit identification paper and filed a patent application with patent application number 168299, and as a result of further research, we completed the present invention.

, (Means for Solving the Problems) The present invention has been developed as a result of research into a method that allows only consumers to easily determine authenticity as needed. A layer consisting of any of the following is used as the lower surface layer of the paper, and on the upper surface, a non-fluorescent pulp or opaque coating layer, and a printing layer are printed with a watermark ink to reach the fluorescent dye addition layer of the lower surface layer. By placing an amount that can be made transparent as a surface layer and applying watermark printing, the surface layer becomes transparent and the fluorescent reactant-containing layer formed below the surface is exposed, and the appearance is no different from simple watermark printing, but 300~4vOnm
When irradiated with ultraviolet rays that have a peak at It is something that

The surface of the paper used is no different from a normal pulp layer or coating layer, and there is no problem with post-processing printing or coating.

Fluorescent reactive substances that emit fluorescence when irradiated with ultraviolet light include fluorescent pigments made by dissolving fluorescent dyes in synthetic resin to form a solid, and finely pulverized fluorescent pigments, as well as sulfides and silicones such as zinc, calcium, and cadmium. The main ingredients are acid salts, and copper, manganese, silver, etc. are added as activators.
Phosphor pigments that produce colors from blue to red, general fibers, paper,
There are many types of fluorescent whitening dyes used in plastics, such as water-soluble ones, solvent-soluble ones, and ones for addition to synthetic resins (5), but stilbene-based water-soluble fluorescent dyes, which are generally used for paper manufacturing, are Brighteners are relatively inexpensive, have excellent light resistance, weather resistance, and yellowing resistance, and are the easiest to use. Furthermore, a large number of paints and inks have been prepared using the above-mentioned fluorescent reactive substances, and any of them can be used in the present invention.

If the layer covering the fluorescent reactant added layer is pulp, the penetration of the solvent-based transparent ink for watermarking is generally good, but if the ink spreads in the plane direction, the printed image will be blurred and lack sharpness. However, in this case,
Add 10-20% filler internally to the pulp or add PVA to the surface
Bleeding and blurring can be prevented by coating with an oil-resistant resin such as, but in the latter case, if too much coating is applied, ink penetration may be inhibited and printing defects may occur.

In the case of coated paper, poor penetration of the watermark ink is generally a likely cause of printing defects, so excessive calendering that inhibits ink penetration may increase density or impede lipophilicity. (6) Care must be taken when applying harsh substances.

(Function) The layer containing the fluorescent reactive substance has the function of emitting fluorescence only when irradiated with ultraviolet rays, and the transparent ink printed portion of the surface layer covering the layer containing the fluorescent reactive substance has a wavelength of 300 to 400 nm.
When irradiating ultraviolet rays with a peak at
It has the function of emitting 500 nm fluorescence, reflecting it, and re-transmitting it through the transparent ink area to make the printed fluorescence image visible.

(Example) The present invention will be explained according to an example. In addition, the example section,
% is a part by weight or % by weight.

Example 1 Water-soluble fluorescent whitening dye that is a diaminostilbendisulfone derivative, manufactured by Shin Nisso Kako ■, trade name: Keikol BXN
Fine m containing 1% of L per pulp 65 g/
7 g/m of paint with the following composition on the surface of the paper.
” Coat the paper and pass it through a calendar roll.

Table 1 Paint blended kaolin 60 parts Light carbon Cal 40 Dispersant 0.5 Casein 8 SBR latex 10 Lubricant 1.5 Solid content 43% On the paint of this paper, Tesfine 1 of Hitachi Chemical Polymer
A transparent ink was prepared using 0.30 parts of TA-020 as a main agent, 15 parts of TA-020 as a hardening agent, and 55 parts of a mixed solvent of 70% toluene and 30% ethyl acetate, and heated in a Zahn cup at 20°C.
It was adjusted to have a viscosity of 17 seconds and printed using a lithographic gravure printing machine in which characters were engraved at a depth of 30 microns.

This paper looks like normal watermarked paper, but when the printed surface is irradiated with a hunt lamp that emits ultraviolet light with a peak of 365 millimeters, a counterfeit identification paper was obtained in which characters that emit strong fluorescence appear. .

Example 2 20 parts of NBKP was produced using a circular mesh paper machine with a 7-layer batt.
The pulp of 80 parts of LBKP was added to a freeness of 350 according to the usual method.
c, beaten to c, 2 parts of sulfuric acid, 3 parts of sizing agent, 2 parts of acrylamide, 15 parts of talc, Keikol BXN
Part L1 was added to make a 50 g/m2 surface and lower layer, and a paper stock of 50 g/m2 from which Kikol was removed from the above surface layer was used as a surface layer, and PVA with a saponification degree of 98% was coated with a size press coater.
coated with 15 g/+n” on one side, basis weight 300
An uncoated white ball of g/m2 is made.

Using the transparent ink used in Example 1 on this paperboard, 3
Watermark printing was performed using a roll-type gravure printing machine having letters and patterns with a plate depth of 5 mm to obtain a paperboard with a transparent image in which the printed portion became transparent. This paper is a paperboard for forgery identification in which the printed portion emits fluorescence when the printed surface is irradiated with the ultraviolet lamp shown in Example 1.

Example 3 Containing a phosphor pigment that produces a red color due to fluorescence (9) Fluorescent coloring ink-5365 Red manufactured by Dainichiseika Chemical Industry Co., Ltd. was mixed with toluene at a liquid temperature of 20'C1No3 Zahn cup.
65 g / 5 seconds with a roll with a plate depth of 30 microns
5g / + with gravure printing machine on bleached kraft paper of +♂
Coat the entire surface.

On top of this, 15 g/+n2 of the paint shown in Table 1 of Example 1 was applied.
The transparent ink of Example 1 is used to gravure print an image on the coated surface. In appearance, there is no difference from normal transparent printing, but when the printed surface is irradiated with an ultraviolet lamp, the red fluorescent image does not appear.
By irradiating the printed image with ultraviolet rays, the printed image becomes fluorescent, allowing only the customer to determine the authenticity.
We provide paper that displays the company mark, company name, etc., and also has the function of a fancy paper with anti-counterfeiting properties and a watermark pattern.

The present invention can be used not only for securities paper, horse racing tickets, car tickets, gift certificates, and other paper used as cash vouchers, but also for -fi packaging paper, labels, packages, cardboard boxes, etc. (10) It makes counterfeiting of products easier. It is possible to supply paper that can be used for purposes such as distinguishing between

The safety of fluorescent whitening dyes, which are typical fluorescent reactive substances, has been studied for a long time, and it has been demonstrated in daily life that there is no effect on sensitive infants when they are used orally or transdermally. However, paper with fluorescent dyes is not only prohibited by the Food Sanitation Law from being used as packaging paper that comes into contact with food, but also is prohibited by the Japanese Industrial Standards (JIS'), which was established in 1948, for envelopes, It is stated in the base paper section of stationery and notebooks that ``Fluorescent dyes are not re-introduced during the paper-making process,'' but since they are covered with pulp and a coating layer that are not included, they can be used without problems. can.

Claims (5)

[Claims] (1) By printing an image using transparent ink on the surface layer of coated paper, paper, and paperboard with a layer containing a fluorescent reactive substance provided directly below the surface layer, and irradiating the printed surface with ultraviolet rays. A counterfeit identification paper that is characterized by a visible fluorescent image. (2) The counterfeit identification paper according to claim (1), which is produced by blending a fluorescent reactive substance into the paper stock constituting the front and lower layers of a multilayer paperboard. (3) The counterfeit identification paper according to claim (1), wherein an opaque coating layer is provided on the surface of the paper or paperboard, which can be made by blending a fluorescent reactive substance into the paper stock constituting the surface layer of the paper or paperboard. (4) A layer containing a fluorescent reactive substance is provided on the surface of coated paper, paper, paperboard, etc. by paint coating, resin coating, printing, etc., and an opaque coat layer containing no fluorescent reactive substance is provided on top of this. The forgery determination sheet according to claim (1). (5) Claims (1), (2), (3), and (4) wherein the fluorescent reactive substance is a fluorescent pigment, a fluorescent whitening dye, a fluorescent coloring pigment, or the like.
) counterfeit identification paper.