JP2009223598A - Preprocessing method for determining authenticity of printed matter for voucher - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent authenticity determination from being interrupted by externally stuck iron (II) ions, copper (II) ions, or chrome (III) ions when determining the authenticity of a printed matter for a voucher such as a ticket by luminol reaction. <P>SOLUTION: Cobalt (II) ions penetrated into a printed matter for a voucher are not easily masked, but when the cobalt (II) ions are previously wiped out by filter paper into which sodium ethylenediaminetetraacetate solution allowed to be easily masked is impregnated to mask ions such as externally stuck iron (II) ions as chelate metals, the accuracy of authenticity determination is improved by performing the luminol reaction using cobalt (II) ions. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a pre-processing method for authenticity determination of a printed matter of a voucher so that the authenticity judgment is not disturbed by a metal ion externally attached to the printed matter of the voucher when determining the authenticity of the printed matter of a voucher or the like Belongs to the technical field.

Today, printed tickets such as tickets, express tickets, limited express tickets, reserved seat tickets, admission tickets, cash vouchers, meal tickets, etc. are issued. It is. Therefore, for example, a color former is applied to the surface of a ticket, for example, while a dye that reacts with the color former is added to the ink used for the stamp, and the card base in the portion where the stamp is pressed There is known a technique in which the authenticity (true cancer) of a card is discriminated by a change in color of the card (Patent Document 1).
However, today, there are many things that color the entire surface of the printed matter such as tickets, and when the authenticity is determined by color development as in the conventional case, the authenticity is determined by the color preliminarily applied to the entire surface of the printed matter. There is a problem that it is difficult to discriminate true / false. In addition, since the part where the stamp is pressed is colored, it is overlooked that there is a mechanism for preventing counterfeiting simply by confirming this color development state, and the counterfeiter notices this and intentionally stamps with the ink of the corresponding color There is a problem that it is counterfeited.
Therefore, a positive catalyst typified by cobalt (II) ions is charged on the surface of the certificate printed matter, and luminol is applied to the collected certificate printed matter so that the luminol reaction can be performed so that the light emission state can be observed and true / false judgment can be made. As a result, it was proposed that there was no anti-counterfeiting mechanism as it was not colored only by the printed matter of the certificate itself (Patent Document 2).
JP-A-6-55882 JP 2003-85613 A

  However, the voucher printed matter obtained is held by hand, and in such a case, sweat adheres to the surface of the voucher printed matter, but the sweat contains trace amounts of iron (II) ions and the voucher is printed. Adhering to the surface of the printed matter, the adhering iron (II) ion becomes a positive catalyst and causes a luminol reaction, which interferes with authenticity judgment. The positive catalyst as a metal that interferes with the authenticity judgment is not only iron (II) ions, but also copper (II) ions, which are 10-curing raw materials, and metals that are often used in railway machinery. There is a problem that it is difficult to make a true / false judgment when a metal that is a familiar metal such as chromium (III) ion and acts as a positive catalyst adheres to the printed voucher. There is a problem.

The present invention was created with the object of solving these problems in view of the above circumstances, and the invention of claim 1 promotes a luminol reaction, which is chemiluminescence, on the surface of a printed voucher. As a pretreatment when making a genuine judgment by using the cobalt (II) ion charged as a positive catalyst for the luminol reaction, it adheres to the surface of the printed voucher as a pretreatment. This is a pre-processing method for authenticity determination of printed voucher, characterized in that a masking agent for masking metal ions that interferes with the authenticity determination is applied.
According to the second aspect of the present invention, the metal ion that hinders authenticity determination is at least one of iron (II) ion, copper (II) ion, and chromium (III) ion, and the masking agent is ethylenediaminetetraacetate The pre-processing method for authenticity judgment of printed matter of claim 1 according to claim 1.

By setting it as invention of Claim 1, since the luminol reaction can be performed in the state by which the metal ion which interferes with the true / false judgment attached externally is masked, the accuracy of true / false judgment improves.
According to the invention of claim 2, it is possible to mask iron (II) ions, copper (II) ions, and chromium (III) ions that are likely to adhere externally, thereby improving the accuracy of true / false judgment. .

Next, embodiments of the present invention will be described with reference to the drawings. Chemiluminescers used in the present invention is luminol: a _{(C 8 H 7 N 3 O} 2 5- amino-2,3-dihydro-1,4-Futarajion (3-aminophthalic acid hydrazide)), said luminol, alkali When it is oxidized with an oxidizing agent (oxygen) such as hydrogen peroxide or hypochlorite in the presence of cobalt (II) ion (Co ⁺⁺ ), which is a positive catalyst, in a state solubilized in a solution, yellow-green chemiluminescence Indicates.

Therefore, when the printed voucher is a ticket 1 as shown in FIG. 1, for example, (1) at the time of production (manufacturing), an arbitrary symbol or mark is printed in advance with ink containing cobalt chloride (CoCl ₂ ). Or print with characters etc. in addition to the ink, (2) add cobalt chloride to the ink that prints the characters necessary for the ticket 1 at the time of ticketing, (3) any front and back of the ticket surface at the time of ticketing Ink containing cobalt chloride is printed at a position or pressed with a rubber stamp or the like. (4) Cobalt (II) is added to the ink as needed at the ticket gate by adding cobalt chloride. ) Charge portions 1a, 1b, 1c charged with ions as needed are formed. In other words, in the present invention, the preparation of cobalt ions is not limited to printing of tickets, but can be performed as needed, such as at the time of production or after ticketing.
Cobalt ions can be charged as an aqueous solution, but the concentration may be in the order of pmol L ⁻¹ (minus the first power of picomolar liters), and it is determined whether or not the charging process is made with the naked eye even when charged in tickets. For this reason, the printed voucher is indistinguishable from the normal one, and there is no fear that it is possible to see when and where the anti-counterfeit measures are being implemented.

When authentic confirmation is requested, for example, when the printed matter is a ticket, and there is a request for refund of the ticket from the passenger, the luminol solution is prepared, and the prepared luminol solution is used as the ticket. Before that, it is necessary to treat the metal that interferes with the authenticity judgment. This treatment is a chelate masking treatment.
Most of the metal ions that interfere with authenticity judgment are iron (II) ions that easily adhere to sweat and cosmetic raw materials, and copper (II) ions that are raw materials for coins, and are often used in railway machinery. There are chromium (III) ions. Therefore, a metal chelate is specifically generated and masked for these metal ions, but a masking agent that does not easily generate a metal chelate with a cobalt (II) ion charged in the printed voucher is selected, and the masking is performed. After the agent is applied to the voucher printed matter and masked before the authenticity determination by the luminol reaction, an accurate authenticity determination can be made by reacting the loaded cobalt (II) ion as a positive catalyst. Become.

  Examples of such a masking agent include ethylenediamine, ethylenediaminetetraacetate (metal ions constituting the salt include sodium ion and potassium ion), tartaric acid, and oxalic acid is an iron (II) ion. In addition, cyanide and murexide are effective for copper (II) ions, and these can also be employed.

Now, a case where sodium ethylenediaminetetraacetate is employed as a masking agent will be described. A filter paper 2 is impregnated with 1.0 mmol L ^-1 aqueous solution of sodium ethylenediaminetetraacetate. It is preferable that the gripping part 3 is provided so that the hand does not touch the masking agent, and this is put in a sealed container and taken out during pre-processing for authenticity work, and the printed surface of the printed voucher 1 is prepared. This masks the interfering metal ions by generating metal chelates. Thereafter, a luminol reaction is performed on the printed voucher 1 to make a true / false judgment.

Now, while preparing each aqueous solution of cobalt (II) ion, iron (II) ion, copper (II) ion, and chromium (III) ion having a concentration of 10 μgm L ⁻¹ , cobalt (II) having a concentration of 5 μgm L ⁻¹ ( II) Reagents prepared by mixing equal amounts of aqueous solutions of iron (II) ions and copper (II) ions each having a concentration of 5 μgm L ⁻¹ in an aqueous solution of ions were prepared, and the equivalent amounts of these reagents were Apply to ticket 1 and charge. And when these boarding tickets 1 are made to luminol react without performing the said masking process, the light emission intensity at the time of making a luminol reaction after masking process is shown in FIG.

  The emission intensity is a relative intensity, and each of the metal ions alone had a high emission intensity of 100 before masking, but the emission intensity of the masked one was 59, It is confirmed that the iron ions are 6.9, the copper ions are 0.65, and the chromium ions are 56, which is lower, that is, iron ions and copper ions are more easily masked than cobalt ions. For chromium ions, the masking is about the same as cobalt ions.

Then, when the emission intensity is observed for a mixture of cobalt ions and iron ions, the one before masking is 101 and the one after masking is 60. As described above, the emission intensity before and after masking is reduced from 100 to 59 for the cobalt ion alone, whereas it is greatly reduced from 100 to 6.9 for the iron ion alone. It matches. In other words, the light emission intensity when masking a mixture of cobalt ions and iron ions is the result of most of the iron ions being masked and contributing little to light emission, and cobalt ions that are difficult to mask are emitted by the luminol reaction. It can be said that it may be judged.
Similarly, for the mixture of cobalt ions and copper ions, it is observed that the emission intensity is reduced from 110 to 69 before and after masking. However, as described above, most of the copper ions are masked. Therefore, it can be determined that cobalt ions which are difficult to be masked contribute to most of light emission.

  And in reality, metal ions that interfere with authenticity determination are often much less than the concentration of the cobalt (II) ions charged, and from this, it is presumed that the same result will be obtained for chromium ions, By performing such a masking process before the luminol reaction, it is possible to accurately determine the authenticity by the luminol reaction.

It is a front view of a boarding ticket. It is a perspective view of the filter paper impregnated with the masking agent. It is a table | surface figure which shows the emitted light intensity when it is made to react with luminol.

Explanation of symbols

1 ticket 1a to 1c preparation section 2 filter paper 3 gripping section

Claims (2)

  In determining authenticity by using cobalt (II) ion charged as a positive catalyst for accelerating the luminol reaction, which is chemiluminescence, on the surface of the certificate printed matter, the authenticity is determined by causing the luminol reaction. When the authenticity of the printed voucher is characterized by applying a masking agent for masking metal ions that interfere with the authenticity of the externally attached to the surface of the printed voucher. Pre-processing method.   The metal ion that hinders authenticity determination is at least one of iron (II) ion, copper (II) ion, and chromium (III) ion, and the masking agent is ethylenediaminetetraacetate. The pre-processing method for authenticity determination of the printed voucher according to claim 1.

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