JP2011213074A - Forgery preventing printed matter and printing method for preventing forgery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide forgery preventing printed matters on which the stealth thermal transfer recording itself made on a material is to be transferred by using a hot-melt ink ribbon can not be observed directly, the stealthy information of which can be recognized by an infrared light detection means and the genuineness of which can be determined clearly by a simple and inexpensive method, and to provide a printing method for preventing forgery.SOLUTION: The forgery preventing printed matter having stealthy properties is characterized in that the stealth thermal transfer recording and a thin film are arranged on a body to be transferred. The stealth thermal transfer recording is printed by using the hot-melt ink ribbon, in which a hot-melt substance that does not absorb the exciting light of an infrared phosphor or the light emitted therefrom at the least and an infrared fluorescent substance are blended. The thin film is formed to cover the stealth thermal transfer recording and colored in a color tone visible in visible light and transmits the exciting light of the infrared phosphor. The printing method for preventing forgery is also provided.

Description

  The present invention relates to an anti-counterfeit printed material and an anti-counterfeit printing method, and more particularly to an anti-counterfeit printed material and an anti-counterfeit printing method for performing stealth thermal transfer recording on a transfer material using a heat-meltable ink ribbon.

Conventionally, various methods for performing anti-counterfeit printing using a hot-melt ink ribbon are known. For example, there is an ink in which an infrared absorber is blended in an ink ribbon to prevent forgery. However, depending on the type of color material such as carbon black, the ink itself absorbs infrared light, and thus cannot be used as a stealth ink.
Some use UV-emitting materials. However, since ultraviolet rays have a short wavelength and poor light transmission, they cannot be identified unless the printed part is exposed on the surface. Equipment was needed. Also, black light has become quite popular, and it has not been sufficient in terms of anti-counterfeiting effects.

  In all of the conventional anti-counterfeit printing methods, the printing part is exposed on the surface and cannot be directly observed from the surface side, but the stealth information cannot be optically recognized by the recognition machine.

  Although the printing is exposed on the front side, which is not a direct background art of the present invention, examples of specific patent documents are given as a technique for preventing falsification with ink in a non-visible light region.

  The technique described in Patent Document 1 uses a sublimation ribbon and performs printing with thermal sublimation ink, and is aimed at preventing tampering by performing multi-tone printing with ink in a non-visible light region. It is. However, since multi-tone printing is performed with a sublimation ribbon, it is difficult to obtain binary authenticity, and even if binary gradation printing is printed, there is variation in absorption intensity. The accuracy was difficult. In addition, since variations during manufacturing are also affected, manufacturing accuracy is required, cost is high, and it is not simple. Furthermore, since a sublimation dye was used, it was inferior in light resistance and lacked versatility.

  The thing of patent document 2 is invention regarding an infrared absorption printed matter and its reading method, and authenticates using the material which has a different infrared absorption wavelength. However, since two or more kinds of materials having different wavelengths are used, it is essential to prepare a plurality of materials, and it is necessary to prepare a plurality of ribbons containing them. Due to the simultaneous use of these devices, the device becomes large, and the sensor is expensive and requires two or more types of highly accurate sensors.

  The one described in Patent Document 3 is intended to prevent forgery by forming an ink layer so that the coloring density is non-uniform and forming a recording with non-uniform shades for each recording region. However, anti-counterfeiting by this method is like a hologram, and although there is a certain anti-counterfeiting effect, the same printed matter is used because it is a method of preventing counterfeiting by printing different non-uniform things every time. It could not be manufactured, the authenticity judgment could only be made at a low dimension, and some stealth information could not be given by the ribbon.

JP-A-5-58347 JP 2006-213017 A JP 2002-137555 A

  The present invention relates to an anti-counterfeit printed matter and an anti-counterfeit printing method, and although a stealth thermal transfer record itself cannot be directly observed on a transfer material using a heat-meltable ink ribbon, an infrared light detection means such as an infrared light detection defector is used. It is an object of the present invention to obtain anti-counterfeit printed matter and anti-counterfeit printing method capable of recognizing stealth information and making a clear authenticity judgment with a simple and inexpensive method.

In order to solve the above-mentioned problems, the present invention provides a stealth thermal transfer recording printed on a transfer medium by a hot-melt ink ribbon containing at least a hot-melt material and an infrared fluorescent material, and the stealth thermal transfer recording. The anti-counterfeit printed matter and the anti-counterfeit printing method were completed by providing a specific thin film to be covered.
That is, the present invention
“1. Stealth thermal transfer recording printed on a transfer target by a hot-melt ink ribbon containing at least a heat-melting substance that does not absorb excitation light or light emission of an infrared phosphor and an infrared phosphor, and the stealth A stealth anti-counterfeit printed matter, characterized in that a thin film that is colored in a color tone visible by visible light and that transmits the excitation light of the infrared fluorescent material is provided so as to cover the thermal transfer recording.
2. Using a heat-meltable ink ribbon provided with a heat-transfer ink layer containing at least a heat-meltable substance that does not absorb excitation light or light emission of infrared phosphors and an infrared fluorescent substance on a substrate, on the material to be transferred This is a printing method that performs stealth thermal transfer recording. At least the primary printing is performed with a hot-melt ink ribbon, and the primary printing is covered with a color that is visible to visible light, and transmits infrared light excitation light, etc. A stealth anti-counterfeit printing method, characterized in that stealth thermal transfer recording on a transfer material is not directly visible, but stealth information is recognized by infrared light detection means. ".

  According to the anti-counterfeit printed matter and the anti-counterfeit printing method, the stealth thermal transfer recording itself cannot be directly observed on the material to be transferred using the heat-meltable ink ribbon, but the infrared light detecting means such as an infrared light detecting deflector can be used. It is possible to recognize stealth information and to obtain an excellent effect of obtaining a forgery prevention printed matter and a forgery prevention printing method capable of making a clear authenticity judgment with a simple and inexpensive method.

Sectional drawing which represented typically an example of the heat-meltable ink ribbon used for this invention Sectional drawing which represented typically an example of the forgery prevention printed matter obtained by this invention Sectional drawing which represented typically another example of the forgery prevention printed matter obtained by this invention

  Normally, when printing is performed not only with stealth printing but also with a thermal transfer ink ribbon, the printed portion has a mark and can be visually discerned when viewed closely. This cannot be called stealth printing. Therefore, in the present invention, a stealth thermal transfer recording printed on a transfer medium by a hot-melt ink ribbon containing at least an infrared phosphor excitation light and light that does not absorb excitation light and light emission and an infrared fluorescent material. After that, if the stealth thermal transfer recording is covered with a thin film that is colored in a visible color visible tone and transmits the excitation light of the infrared fluorescent material, the stealth thermal transfer recording on the transfer material is not directly visible, Stealth information can be recognized by infrared light detection means such as an infrared light detection deflector, and an effective anti-counterfeit printed matter and anti-counterfeit printing method can be obtained.

In the present invention, stealth recording is performed by stealth thermal transfer recording printed by a hot-melt ink ribbon containing a hot-melt material that does not absorb excitation light or light emission of an infrared phosphor and an infrared fluorescent material. In this case, it is preferable that the ink color is substantially colorless because stealth is further improved.
In the present invention, infrared light is used. However, since infrared light has a long wavelength, a characteristic of good transparency is utilized. Even if a thin film that visually covers the recording is provided on the stealth thermal transfer recording, the recognition device can recognize the stealth information.
For accurate information recognition by an infrared diffuser, it is important that a solid stealth thermal transfer recording is performed. In order to obtain binary information with a clear difference between a portion with information and a portion without information, the following hot-melt ink ribbon is used.

  As the heat-meltable ink ribbon for obtaining the stealth thermal transfer recording of the present invention, a thermal transfer ink layer in which a heat-meltable substance that does not absorb at least the excitation light or light emission of the infrared phosphor and the infrared fluorescent substance is blended on the substrate. The provided hot-melt ink ribbon is used. As the base material, various plastic films can be used. For the heat-meltable ink ribbon of the present invention, a polyester film of about 2.5 to 6.0 μm with a heat-resistant slipping layer provided on the back surface is preferable. Can be used.

  The infrared fluorescent material used in the present invention is an infrared excitation and infrared emission phosphor, and is a material that is excited and emits infrared light and fluorescence when a certain amount of infrared light is applied. A conventionally well-known material can be used for such an infrared fluorescent substance. Black light for ultraviolet light emission is widespread and can be generally obtained, but infrared detectors are not widely used and are suitable as a material for preventing counterfeiting. The blending amount of the infrared fluorescent material is preferably 4.5 to 10.0% by mass from the viewpoint of fluorescence intensity, cost and the like.

The present invention is characterized in that a thin film that is colored in a color tone that is visible to visible light and transmits excitation light of the infrared fluorescent material is provided so as to cover the stealth thermal transfer recording.
Since infrared light has a long wavelength, transparent resin and glass can be transmitted even with a thickness of about 5 cm. Therefore, it can be recognized by infrared light detection means such as an infrared diffuser even if a thin film that is colored in a visible color and is transparent to the excitation light of the infrared fluorescent substance is provided and the stealth printing is hidden from visible light. Therefore, the reading performance is remarkably excellent as compared with methods such as ultraviolet light emission and infrared absorption.

As a typical example of the configuration of the thin film, it has the same configuration as that of the hot-melt ink ribbon for producing the stealth thermal transfer recording, and is colored in a color tone that allows visible light to be visually recognized, and transmits the excitation light of the infrared fluorescent material. A thin film can be obtained by performing thermal transfer printing so as to cover the stealth printing portion with the heat-meltable ink ribbon having the above composition. In this case, the hot melt transfer printing for performing stealth printing and the thin film transfer conditions and installation method can be made common, which is preferable in terms of space saving, low cost, and efficiency.
In addition, if the stealth printing is colorless or light color or colored in the same system as the thin film, the thin film can be lightly colored or the film thickness can be reduced, improving the accuracy of stealth recognition by infrared light detection means. Therefore, it is more preferable.

  Examples of other thin films include those in which colored glass or colored film is laminated or adhered, and those in which thin paper such as thin colored paper is laminated or adhered.

  The infrared fluorescent material used in the present invention forms a thermal transfer ink ribbon layer together with a heat-meltable material that does not absorb the excitation light or light emission of the infrared phosphor. Examples of the heat-meltable material include resins and waxes. Any material can be used as long as it melts with heat. Again, the heat-meltable material must be a heat-meltable material that does not absorb the excitation light or light emission of the infrared phosphor. This is because the use of a hot-melt material that absorbs the excitation light or light emission of the infrared phosphor affects the stealth properties of the infrared phosphor. Further, the thermal transfer ink layer itself may be colorless or colored. If the same color as the thin film covering the stealth printing is used, the stealth printing can be made more difficult to visually recognize, and the thin film can be made thinner. In addition, thin film coloring information becomes a recognition correction item of the infrared light detection means, but if it is colored with information of the same wavelength as the thin film coloring correction information, new correction information is not generated and confused. The recognition error is also reduced, which is preferable.

  Various additives can be blended in the heat-meltable ink, but as described above, it is necessary that the ink does not absorb the excitation light or light emission of the infrared phosphor.

  As described above, the heat-meltable substance and various additives must not absorb the excitation light or light emission of the infrared phosphor, but if the thermal transfer ink layer can be substantially discriminated by stealth printing, A fluorescent material that absorbs excitation light or light emission or a colored material can also be used.

The present invention is also a printing method for performing stealth thermal transfer recording on a transfer material using the hot-melt ink ribbon.
Specifically, using a heat-meltable ink ribbon provided with a thermal transfer ink layer containing at least a heat-meltable substance that does not absorb excitation light or light emission of infrared phosphor and an infrared fluorescent substance on a substrate, A printing method for performing stealth thermal transfer recording on a material to be transferred, wherein at least primary printing is performed with a hot-melt ink ribbon, and the primary printing is covered with a color tone visible to visible light, and an infrared fluorescent substance A thin film that transmits excitation light is provided, and stealth thermal transfer recording on the transfer material is not directly visible, but stealth information is recognized by infrared light detection means such as an infrared light detector. This is a forgery prevention printing method.

The hot-melt ink ribbon for performing stealth thermal transfer recording is the same as described above, and the same thin film can be used.
More specifically, stealth primary printing is performed with the first ink ribbon as described above, and printing is performed as a thin film with a hot-melt ink ribbon for forming a thin film on an arbitrary portion that covers the first, This is an excellent method for obtaining a stealth anti-counterfeit printed matter that is invisible from the surface side. By performing such stealth printing, it is possible to obtain a forgery-preventing printed matter that can be clearly determined by a simple and inexpensive method and at the same time can be reliably attached with stealth information.

  Further, in the present invention, a hot-melt ink ribbon is used for stealth printing, but unlike sublimation ribbons, etc., gradation is unlikely to appear, and the composition of a substantially uniform hot-melt ink layer in almost all areas Since it has a thickness, it is possible to expect a binary analysis result even when analyzing the infrared emission (fluorescence) intensity, the analysis accuracy is improved, and the stealth information pattern can be complicated, and thus more preferable forgery prevention A printed matter can be obtained.

  Furthermore, when performing stealth thermal transfer recording, two types of stealth hot-melt ink ribbons can be used. For example, primary printing is performed with the first ink ribbon, and secondary printing is performed with the second ink ribbon on any portion above it, so that two or more types of stealth printing with different infrared fluorescence intensities are performed. The variation in infrared tendency intensity can be increased stepwise (non-stepless) due to the difference in the infrared fluorescence intensity of the printed material in the overlapping part with the single part of the stealth property to prevent forgery more effectively An anti-counterfeit printed matter is obtained.

  In this case, if the same ink ribbon is used for the first ink ribbon and the second ink ribbon, it is possible to obtain an anti-counterfeit printed matter more easily and at a low cost, and it is also binary for analyzing the infrared emission intensity. As a result of expecting an accurate analysis result, even if a plurality of ink ribbons are used, the analysis accuracy is not lowered, and a plurality of pieces of stealth information printed in a superimposed manner can be complicated, and a more preferable anti-counterfeit printed matter can be obtained.

  On the other hand, it is possible to use a plurality of ink ribbons having different infrared fluorescence (fluorescence) intensities for the first ink ribbon and the second ink ribbon, but the infrared fluorescence intensity when overprinting is simply multipled. Therefore, since the analysis accuracy tends to decrease when the print pattern and the number of times of printing become complicated, a software pattern such as a print pattern with a print area that detects a single infrared emission intensity in advance is used. It is preferable to take countermeasures for improving the forgery prevention accuracy.

  The coating thickness of the thermal transfer ink layer on the hot-melt ink ribbon is not particularly specified, but is preferably about 1.0 to 3.0 μm in consideration of obtaining sufficient infrared fluorescence intensity. Other functional layers such as a peeling layer between the base material and the thermal transfer ink layer and an adhesive layer provided on the thermal transfer ink layer to improve adhesion to the transfer medium may be provided.

  As described above, the heat-meltable ink ribbon used in the present invention is configured by providing a thermal transfer ink layer on a substrate. However, the means for producing the ink layer is not particularly defined, and is water-based or Disperse and dissolve in an oil-based solvent to prepare a coating solution, and apply to the required coating thickness with a coating method such as gravure coater, wire bar coater, air knife coater, etc. to obtain a thermal transfer ink ribbon it can.

  Examples of the present invention will be described below, but the present invention is not limited thereto. In the following examples and comparative examples, all “parts” are based on mass unless otherwise specified.

Example 1
<Preparation of hot melt ink ribbon>
A heat-resistant slipping layer is formed on one side of a polyester film having a thickness of 5 μm to form a base material, and a thermal transfer ink layer component having the following constitution is prepared on the reverse side of the heat-resistant slipping layer of the base material, and the dry mass is 3. It was coated with a gravure coater so as to be 0 g / m ² and dried to form a thermal transfer ink layer, thereby producing a hot-melt ink ribbon.
(Thermal transfer ink layer component)
Polyester resin 80 parts Polyethylene wax 20 parts Infrared fluorescent substance (Note 1) 10 parts Toluene 400 parts Methyl ethyl ketone 400 parts (Note 1) Emission wavelength peak: about 980 nm, 872 nm, 895 nm, excitation wavelength peak
About 824 nm, 750 nm, 588 nm
<Preparation of colored ink ribbon for thin film preparation>
A heat-resistant slipping layer is formed on one side of a polyester film having a thickness of 5 μm to form a base material, and a thermal transfer ink layer component having the following constitution is prepared on the reverse side of the heat-resistant slipping layer of the base material, and the dry mass is 3. A gravure coater was applied and dried so as to be 0 g / m ² , a thermal transfer ink layer was formed, and a colored ink ribbon for forming a thin film was prepared.
(Colored ink layer components)
Polyester resin 80 parts Polyethylene wax 20 parts Yellow pigment 15 parts Toluene 400 parts Methyl ethyl ketone 400 parts

Using the obtained hot-melt ink ribbon, a substantially colorless stealth print having an arbitrary pattern was performed on the transfer material. The stealth thermal transfer recording was substantially invisible to the naked eye and was not conspicuous, but the thermal transfer trace remained, and the print pattern could be discriminated as it was by adjusting light.
Therefore, a thin film was formed on the colored ink ribbon so as to cover the stealth printing, and a stealth anti-counterfeit printed matter was completed.
Since the surface of the stealth thermal transfer recording is covered with a thin film, the anti-counterfeit printed matter is in a state where it is substantially invisible to the naked eye and is a stealth print having a specific infrared fluorescence intensity. It is a stealth anti-counterfeit printed matter that can detect print patterns only with an infrared detection detector as an infrared light detection means that has registered the excitation fluorescence wavelength, fluorescence intensity, etc., and can effectively prevent forgery. It was.

Example 2
Two types of hot-melt ink ribbons of Example 1 were prepared and used as first and second hot-melt ink ribbons, and stealth printing was performed as a second example using a plurality of hot-melt ink ribbons.
Using the heat-meltable ink ribbon of Example 1, first, primary printing was performed on the entire surface of the transfer material with the ink ribbon of Example 1 as the first ink ribbon. Secondary printing was performed with the same ink ribbon of Example 1 as the second ink ribbon, and stealth thermal transfer recording was performed. The stealth thermal transfer recording was substantially invisible to the naked eye and was not conspicuous, but the thermal transfer trace remained, and the print pattern could be discriminated as it was by adjusting light.
Therefore, as in Example 1, the colored ink ribbon of Example 1 was used to form a thin film so as to cover the stealth printing, and the stealth anti-counterfeit printed matter of Example 2 was completed.
Since the surface of the stealth thermal transfer recording is covered with a thin film, the anti-counterfeit printed matter is in a state where it is substantially invisible to the naked eye, has a specific infrared fluorescence intensity, and has two or more different infrared fluorescence intensity. Because it was stealth printing, the print pattern can be detected only with an infrared detector as an infrared light detector that has previously registered the print pattern, infrared excitation fluorescence wavelength, fluorescence intensity, etc. It was a stealth anti-counterfeit printed matter that can be prevented.

Examples 3-6
The hot-melt ink ribbons of Examples 3 to 4 were the same as Example 1 except that the amount of the infrared fluorescent material in Example 1 was changed to 5 parts (Example 3) and 1 part (Example 4). Was completed, and the anti-counterfeit printed matter was completed.
Similarly to Example 2 in which the ink ribbon of Example 1 was diverted, the heat-meltable ink ribbons of Examples 3 to 4 were diverted, and the amount of infrared fluorescent material, 5 parts (Example 5), 1 part A hot-melt ink ribbon of Examples 5 to 6 was produced in the same manner as in Example 2 except that (Example 6) was used, and a forgery-preventing printed matter was completed.

Comparative Example 1
A hot-melt ink ribbon of Comparative Example 1 was prepared in the same manner as in Example 1 except that the infrared fluorescent material in Example 1 was not blended, and was similarly subjected to thermal transfer printing, and had the same configuration as the forgery-preventing printed matter. Arranged.

  Examples 3 to 6 were stealth anti-counterfeit printings similar to Examples 1 and 2, but Examples 3 and 6 were low in emission intensity and slightly different in detectability. It was.

  On the other hand, since the infrared fluorescent substance was not mix | blended, the thing of the comparative example 1 did not light-emit, and it was not able to detect a printing pattern at all with the infrared detection detector as an infrared-light detection means.

Other Embodiments As other embodiments, first, on the material to be transferred, primary printing is performed using the hot-melt ink ribbon of Example 1 as the first ink ribbon, and the printing is performed on an arbitrary portion thereon. Secondary printing was performed using the thermal transfer ink ribbon of Example 3 as the second ink ribbon, and stealth thermal transfer recording was performed. The stealth thermal transfer recording was substantially invisible to the naked eye and was not conspicuous, but the thermal transfer trace remained, and the print pattern could be discriminated as it was by adjusting light.
Therefore, as in Example 1, a thin film was formed to cover the stealth printing using the colored ink ribbon of Example 1, and a stealth anti-counterfeit printed matter was completed.
Since the surface of the stealth thermal transfer recording is covered with a thin film, the anti-counterfeit printed matter is in a state where it is substantially invisible to the naked eye, has a specific infrared fluorescence intensity, and has two or more different infrared fluorescence intensity. Because it was stealth printing, the print pattern can be detected only with an infrared detector as an infrared light detector that has previously registered the print pattern, infrared excitation fluorescence wavelength, fluorescence intensity, etc. It was a stealth anti-counterfeit printed matter that can be prevented.
Since printing is performed with different ink ribbons and the difference in infrared fluorescence intensity is provided, the troublesomeness and equipment of using two or more types of ribbons becomes large compared to the case of using the same ribbon described above. Except for problems such as an increase in the size, the anti-counterfeiting effect of stealth was better than when the same ribbon was used.

  Since the infrared fluorescent substance of the present invention has a high fluorescence transmission, the emission intensity can be properly exhibited even in such overprinting, and good detection accuracy can be obtained.

Moreover, even when the examples 1 to 6 are used in a combination other than the above, a good anti-counterfeit effect of stealth is obtained, and further, three types of examples 1, 3, and 4 are printed in order. However, it was possible to obtain a print with good stealth property, and the detection by an infrared detector as an infrared detector was also good.
In addition, although the above embodiment is substantially colorless, there is no particular problem even if it is colored to such an extent that it does not affect infrared detection, and such an application example can of course be employed.

  The present invention relates to a forgery-preventing printed matter and a forgery-preventing printing method due to the above-described configuration, etc., but the stealth thermal transfer recording itself cannot be directly visually observed on the transfer material using a hot-melt ink ribbon, but the infrared light detection dye It can be used as an anti-counterfeit printed matter and an anti-counterfeit printing method that can recognize stealth information by an infrared light detection means such as a fector and can make a clear authenticity judgment with a simple and inexpensive method.

DESCRIPTION OF SYMBOLS 1 ... Base material 2 ... Thermal transfer ink layer 3 ... Medium to be transferred 4 ... Stealth thermal transfer recording (printing with a 1st ink ribbon)
5 ... Stealth thermal transfer recording (printing with the second ink ribbon)
6. Thin film

Claims (2)

A stealth thermal transfer record printed on a transfer material by a hot-melt ink ribbon containing at least an infrared fluorescent substance and a heat-meltable substance that does not absorb excitation light or light emitted from the infrared phosphor, and the stealth thermal transfer record. A stealth anti-counterfeit printed matter, characterized in that a thin film that is colored in a color tone that can be seen with visible light and that transmits the excitation light of the infrared fluorescent material is provided. Using a heat-meltable ink ribbon provided with a heat-transfer ink layer containing at least a heat-meltable substance that does not absorb excitation light or light emission of infrared phosphors and an infrared fluorescent substance on a substrate, on the material to be transferred This is a printing method that performs stealth thermal transfer recording. At least the primary printing is performed with a hot-melt ink ribbon, and the primary printing is covered with a color that is visible to visible light, and transmits infrared light excitation light, etc. A stealth anti-counterfeit printing method, characterized in that stealth thermal transfer recording on a transfer material is not directly visible, but stealth information is recognized by infrared light detection means.

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