JP2004090236A - Printing process, printed matter and ink suitable for printed matter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To contemplate assured security against forgery by preventing an identical convex letter from being reproduced in a card and the like. <P>SOLUTION: Two or more kinds of ink 17 and 18 such as luminescent ink 17 which emits light by a stimulating light excepting a visible light such as ultraviolet or infrared light and non-luminescent ink 18 which does not emit light by the stimulating light but allows its color to be recognized by a visible light, are mixed in a half-mixed state where the ink 17 and 18 are not completely mixed. Then a thick film-like convex letter 20 is printed, in the ink 17 and 18, on the surface of a base material 1 to be printed. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a printing method for preventing counterfeiting by printing on various cards such as a bank card, a credit card, and an IC card, an identification card for identifying a person, a printed matter thereof, and an ink suitable for the method.
[0002]
[Prior art]
As a conventional example of printing characters and the like on a card, there is a conventional example in which a convex character including characters and numerals having a thickness of 0.2 mm or more can be printed using a dispenser (see Patent Document 1).
[0003]
As a conventional example of preventing forgery of a card, there is one in which a recognition mark such as a character or a figure is printed on a card or the like with ink that emits ultraviolet light or infrared light (see Patent Document 2).
[0004]
Other conventional examples of card forgery prevention include printing a latent image mark on a card with an ink containing a white pigment and an infrared-emitting phosphor that emits infrared light (see Patent Document 3), and a cyan-based colorant. An image is printed on a card or the like with an ink containing a colorant that emits ultraviolet light or the like (see Patent Document 4).
[0005]
(Patent Document 1)
JP-A-2002-167540 (paragraph number 0023)
(Patent Document 2)
JP-A-10-77881 (paragraph number 0006-0007)
(Patent Document 3)
JP-A-8-225575 (paragraph number 0006-0007)
(Patent Document 4)
JP 2001-88411 A (paragraph number 0012)
[0006]
[Problems to be solved by the invention]
According to Patent Literatures 2-4, the entirety of a mark for preventing forgery and an image emits light, and the same mark has the same light emission pattern. For this reason, forgery is not always impossible, and it is insufficient for forgery prevention.
[0007]
An object of the present invention is to make it possible to reliably prevent forgery of a card or the like.
[0008]
[Means for Solving the Problems]
The printing method according to the first aspect of the present invention is characterized in that a plurality of types of inks 17 and 18 are mixed in a semi-mixed state, and the convex characters 20 are printed on the surface of the substrate 1 to be printed with the inks 17 and 18. And
[0009]
Examples of the inks 17 and 18 include inks capable of recognizing colors with visible light such as green, red, white, and black, inks emitting fluorescent colors such as green and red by excitation light such as ultraviolet light and infrared light, An ink containing a metal such as brass or particles or powder of a magnetic substance in a dispersed state corresponds to the ink. The substrate to be printed 1 corresponds to a medium (printed matter) related to individual (personal) information such as a license or an identification card, in addition to a bank card, a credit card, an IC card, and the like. Convex characters include letters, numbers, symbols and figures. The semi-mixed state means a state in which the inks are not completely mixed, for example, are mixed in a marble (marble pattern) shape, and each ink is initially separated and becomes a semi-mixed state on the surface of the substrate 1 to be printed. The case is also included.
[0010]
In the printing method according to the second aspect of the present invention, a plurality of types of inks 17 and 18 are filled in the cylinder 13 while being divided in the circumferential direction of the cylinder 13 of the dispenser 6, and the inks 17 and 18 are pressed downward. The convex character 20 is printed on the surface of the base material 1 by being discharged from the nozzle 15 of the dispenser 6.
[0011]
Here, the inside of the cylinder 13 of the dispenser 6 is divided into a plurality of spaces by the separator 31 and each space is filled with the inks 17 and 18 respectively. 13 in the circumferential direction.
[0012]
The cylinder 13 of the dispenser 6 filled with the inks 17 and 18 can rotate in the circumferential direction.
[0013]
In the printing method according to the fourth aspect of the present invention, a plurality of types of inks 17 and 18 are filled in the cylinder 13 while rotating in the circumferential direction of the cylinder 13 of the dispenser 6, and the inks 17 and 18 are pushed downward. The convex character 20 is printed on the surface of the substrate 1 by being discharged from the nozzle 15 of the dispenser 6.
[0014]
The printed matter according to the fifth aspect of the present invention is characterized in that the convex character 20 is printed with an ink containing a plurality of types of inks 17 and 18 in a semi-mixed state.
[0015]
According to a sixth aspect of the present invention, in the printing ink for printing the convex character 20 on the surface of the substrate 1 to be printed, a plurality of kinds of inks 17 and 18 are contained in a semi-mixed state. .
[0016]
Operation and Effect of the Invention
The present invention prints the convex characters 20 by mixing a plurality of types of inks 17 and 18 in a semi-mixed state, so that the degree of mixing (mixing unevenness) of the inks 17 and 18 differs for each convex character 20. Therefore, it is difficult to reproduce the same convex character 20 and forgery can be reliably prevented.
[0017]
When a plurality of types of inks 17 and 18 are filled and discharged in the cylinder 13 of the dispenser 6 in a state of being divided, the inks 17 and 18 are mixed and discharged in a complicated manner, and forgery can be more reliably prevented.
[0018]
Then, when the cylinder 13 of the dispenser 6 filled with the inks 17 and 18 is rotated, the inks 17 and 18 are more complicatedly mixed, and forgery can be further prevented.
[0019]
Even when the inks 17 and 18 are filled into the cylinder 13 of the dispenser 6 while being rotated, and are discharged from the dispenser 6, the inks 17 and 18 are mixed in a more complicated manner, thereby further preventing forgery.
[0020]
BEST MODE FOR CARRYING OUT THE INVENTION
In the present invention, convex letters in the form of a thick film (convex) are printed on the surface of the substrate to be printed. The convex character is printed with a printing ink in a semi-mixed state in which plural kinds of inks are not completely mixed. The convex character is formed in a thick film of, for example, 0.2 mm or more.
[0021]
The types of ink mixed in a semi-mixed state include luminescent inks that emit (color) with excitation light other than visible light such as ultraviolet light or infrared light, and non-light-emitting inks that do not emit light with the excitation light but can recognize color with visible light. A luminescent ink, an ink containing a metal such as brass or aluminum, or particles of a magnetic substance, a scale-like powder, or the like in a dispersed state is applicable.
[0022]
The convex letters include letters, numbers, and symbols that indicate a card number, a user's name, and the like. Examples of the substrate to be printed include a bank card, a credit card, an IC card, and the like, as well as a license and an identification card, and the material thereof is a synthetic resin, paper, metal, or the like. The substrate to be printed may be in the form of a film.
[0023]
The printing ink is a photo-curing ink that cures when irradiated with ultraviolet light, etc., and a thick film with a good shape can be formed in one printing without reducing the discharge speed from the dispenser used for printing. It has formed thixotropic properties.
[0024]
The printing method of the convex character will be specifically described. For this printing method, for example, the following printing apparatus is used. Here, two types of ink, the above-described luminescent ink and the non-luminescent ink, are selected.
[0025]
As shown in FIG. 1, the printing apparatus A includes a printing unit 3 that prints a convex character on the surface of the substrate 1 to be printed with the printing ink 2 and a curing unit that hardens the printing ink 2 on the surface of the substrate 1. And a control unit 5 for controlling the printing unit 3, the curing unit 4, and the like.
[0026]
The printing unit 3 is provided with a dispenser 6 that discharges the printing ink 2 onto the surface of the substrate 1 to be printed and prints a convex character, a first transport unit 7 that transports and holds the substrate 1 to be printed, and the like. The curing unit 4 is provided with a light irradiating unit 8 for irradiating the printing ink 2 on the surface of the printing substrate 1 with ultraviolet light or the like, a second conveying unit 9 for conveying and holding the printing substrate 1, and the like. is there. A supply port 11 for supplying the substrate 1 to be printed to the printing unit 3 is provided on the upstream side (the left side in FIG. 1) of the printing unit 3, and on the downstream side (the right side in FIG. 1) of the curing unit 4. And an outlet 12 for discharging the substrate 1 to be printed.
[0027]
As shown in FIG. 2, the dispenser 6 has a vertically arranged cylinder 13 in which a piston 14 driven up and down by driving means (not shown) is arranged, and the piston 14 presses the printing ink 2 downward. Thus, the printing ink 2 is discharged from the discharge port 16 of the nozzle 15 provided at the lower end of the cylinder 13. The luminous ink 17 and the non-luminous ink 18 forming the printing ink 2 are filled in the cylinder 13 of the dispenser 6. Note that the printing ink 2 may be discharged from the dispenser 6 by applying air pressure to the upper surface side of the printing ink 2 in the cylinder 13 and pushing the printing ink 2 downward. In this case, the piston 14 may be omitted.
[0028]
Examples of the luminescent ink 17 include photocurable polymer precursors such as urethane acrylate monomers and ester acrylate monomers, photopolymerization initiators such as acetophenone and benzophenone, and inorganic fine particles such as aluminum oxide and silica (silicon dioxide). And a known inorganic or organic fluorescent pigment which emits light by excitation light such as ultraviolet light or infrared light. The fluorescent pigment may be in the form of fine particles or powder.
[0029]
As with the luminescent ink 17, the non-luminescent ink 18 contains known components such as a photocurable polymer precursor, a photopolymerization initiator, and inorganic fine particles. The non-light-emitting ink 18 may be transparent or light-shielding ink, and may contain a pigment such as white or red, and fine particles or powder such as brass or aluminum as needed.
[0030]
When the printing ink 2 contains silica fine particles, the diameter of the discharge port 16 of the nozzle 15 of the dispenser 6 is, for example, about 0.15 mm, and the range of the silica weight ratio is about 10 to 16% by weight. The viscosity is adjusted so that a thick film having a good shape is formed. When the silica weight ratio is less than 10% by weight, the printing ink 2 spreads too much to form a thick film of 0.2 mm or more, and when the silica weight ratio is more than 16% by weight, the ink is discharged from the dispenser 6. Speed is too low.
[0031]
Specifically, when the weight ratio of silica is 10% by weight, the viscosity of the printing ink 2 is 75 (Pa · s) when the shear rate is 5 (1 / s), and the viscosity is 75 (Pa · s). The viscosity is adjusted so that the viscosity at a speed of 20 (1 / s) is 22 (Pa · s). When the weight ratio of silica was 16% by weight, the viscosity of the printing ink 2 was 3050 (Pa · s) when the shear rate was 0.1 (1 / s), and the shear rate was 3050 (Pa · s). The viscosity at 0.3 (1 / s) is adjusted to be 2800 (Pa · s). The viscosity of the printing ink 2 can be increased as the diameter of the discharge port 16 of the dispenser 6 increases.
[0032]
The luminous ink 17 and the non-luminous ink 18 are filled in the cylinder 13 of the dispenser 6 in a state where the ink is divided into right and left, that is, in a state where the ink is divided in the circumferential direction of the cylinder 13 (the state in FIG. 2). When the piston 14 is driven downward in this state, the luminescent ink 17 and the non-luminescent ink 18 are pushed downward, and the discharge port 16 of the nozzle 15 is in a semi-mixed state that is not completely mixed. Exhaled from.
[0033]
The dispenser 6 discharges the luminous ink 17 and the non-luminous ink 18 at the same time while the cylinder 13 rotates slowly in the circumferential direction. The pattern of mixing (uneven mixing) between the ink and the non-light-emitting ink 18 is further different. In other words, various mixed irregularities are formed for each convex character, thereby preventing the same convex character from being reproduced (forged).
[0034]
In the printing apparatus A, the printing substrate 1 inserted from the supply port 11 is transported by the first transporting means 7 below the dispenser 6 and held. In this state, the dispenser 6 moves three-dimensionally in accordance with characters and numbers such as a card number input to the control unit 5, and discharges the printing ink 2 while rotating as described above, thereby forming the convex character. Are sequentially printed at predetermined positions on the surface of the substrate 1 to be printed.
[0035]
When the printing of all the convex characters is completed, the substrate 1 to be printed is transported to the curing unit 4 by the transporting units 7 and 9, and is held. In this state, the convex characters on the surface of the base material 1 to be printed are irradiated with ultraviolet light or the like by the light irradiation means 8 to cure the printing ink 2. When the curing of the printing ink 2 is completed, the substrate 1 to be printed is discharged from the discharge port 12 to the outside of the apparatus by the second transfer means 9. Thereby, the printed matter of the present invention is completed.
[0036]
As an example of the determination of the authenticity of such a printed matter, the determination is performed as follows. As shown in FIG. 4, the light emission pattern of the convex character 20 of the printed matter B is registered in the registration device 21. The registration device 21 includes an excitation light irradiating unit 22 that irradiates each convex character 20 of the printed matter B with excitation light (for example, black light) such as ultraviolet light, and a reading unit that includes a CCD camera or the like that reads an emission pattern of the convex character 20. 23, and control means 24 including a computer for storing (registering) the read light emission pattern.
[0037]
When the excitation light irradiating means 22 irradiates each convex character 20 of the printed matter B with excitation light, a portion of each convex character 20 printed with the luminescent ink 17 emits visible light. The light emission pattern of each convex character 20 is read by the reading means 23 and registered in the control means 24. The light emission pattern registered in the control means 24 is sent via the Internet 25 or the like to an authenticity discriminating device 26 installed in a bank or a store where the printed matter B is used.
[0038]
As shown in FIG. 5, the authenticity discriminating device 26 includes an excitation light irradiating unit 27 that irradiates each convex character 20 of the printed matter B with excitation light such as an ultraviolet ray, and a CCD camera or the like that reads a light emission pattern of the convex character 20. And means 28 for determining authenticity by comparing the read light emission pattern with the light emission pattern registered in the registration device 21.
[0039]
Then, the authenticity discriminating device 26 irradiates each convex character 20 of the printed matter B with excitation light, reads a light emission pattern of the convex character 20, and compares the light emission pattern registered in the registration device 21. If the read light emission pattern matches the light emission pattern registered in the registration device 21, the authenticity discrimination device 26 determines that the printed matter is a genuine printed matter B, and if the light emission pattern does not match or the light emission pattern of the convex character 20 can be read. If not, it is determined that the printed matter is a forged print B. This determination result is displayed on the display 30 of the authentication device 26, for example.
[0040]
In the above description, the cylinder 13 of the dispenser 6 is filled with two kinds of inks, that is, the luminescent ink 17 and the non-luminescent ink 18, but three or more kinds of inks may be filled in the cylinder 13. In this case, the inks are filled side by side in the circumferential direction of the cylinder 13. For example, only a plurality of types of non-luminescent inks 18 having different colors such as red and green may be filled, or only a plurality of types of luminescent inks 17 may be filled. A luminescent ink 17 or a non-luminescent ink 18 and an ink containing fine particles such as brass or a magnetic substance in a dispersed state may be filled.
[0041]
For example, when the ink mixed in the semi-mixed state is only the non-light-emitting ink 18 having a different color, the excitation light irradiating means 22 of the registration device 21 and the excitation light irradiating means 27 of the authenticity discriminating device 26 are replaced with: An incandescent lamp or a fluorescent lamp is used as a light source, or the light source is omitted. The reading means 23 of the registration device 21 and the reading means 23 of the authenticity discriminating device 26 are designed to detect only one color of the non-light-emitting ink 18 with a filter or the like so that the non-light-emitting ink of that color is detected. 18. Read the 18 patterns of mixing.
[0042]
Then, the registration device 21 reads the pattern of the mixing state of the non-light-emitting ink 18 of the color to be detected in each convex character 20 of the printed matter B, and registers this pattern. On the other hand, the authenticity discriminating device 26 reads the pattern of the mixed state of the non-light-emitting ink 18 of the color to be detected in each convex character 20 of the printed matter B, compares the read pattern with the pattern registered in the registration device 21, and compares these patterns. Are determined to be genuine printed matter B, and if they do not match or the pattern cannot be read, it is determined to be a forged printed matter B.
[0043]
For example, when one type of ink to be mixed in a semi-mixed state is an ink containing a magnetic material, the registration device 21 and the authentication device 26 detect the magnetism of the magnetic material and contain the magnetic material. The authenticity of the printed matter B is determined based on the ink mixing pattern.
[0044]
As another embodiment of the method of filling a plurality of types of ink into the cylinder 13 of the dispenser 6, each ink may be filled while rotating in the circumferential direction of the cylinder 13. In this case, each ink is spirally filled in the cylinder 13.
[0045]
As another embodiment of the dispenser 6, as shown in FIG. 6, a separator 31 for dividing the space in the cylinder 13 of the dispenser 6 into right and left is provided, and the luminous ink 17 and the non-light emitting are provided in the left and right cylinder spaces 32 and 33. The ink 18 may be filled in a separated state. In this case, the divided pistons 14a and 14b are arranged in the left and right cylinder spaces 32 and 33, respectively.
[0046]
In this embodiment, even if the viscosity of the luminescent ink 17 and the non-luminescent ink 18 is small, they do not mix in the cylinder 13, and a half of the luminescent ink 17 and the non-luminescent ink 18 discharged from the dispenser 6. The mixing state can be properly secured. The printing ink 2 may be discharged from the dispenser 6 by applying air pressure to the upper surfaces of the inks 17 and 18 in the respective cylinder spaces 32 and 33. Also in this case, the pistons 14a and 14b may be omitted.
[0047]
Also in this embodiment, when filling three or more types of ink, the interior of the cylinder 13 of the dispenser 6 is divided into a plurality of spaces in the circumferential direction by the separator 31, and each space is filled with each ink.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of a printing apparatus used in a printing method according to the present invention. FIG. 2 is a longitudinal sectional view of a dispenser used in the printing method. FIG. 3 is a plan view showing an example of a convex character according to the present invention. Schematic configuration of a registration device in which a light emitting pattern of a convex character is registered. [FIG. 5] Schematic configuration of an authentication device. [FIG. 6] Longitudinal sectional view showing another embodiment of a dispenser.
DESCRIPTION OF SYMBOLS 1 Substrate to be printed 2 Printing ink 6 Dispenser 13 Dispenser cylinder 15 Dispenser nozzle 17 Luminescent ink 18 Non-luminous ink

Claims (6)

Mix multiple types of inks 17 and 18 in a semi-mixed state,
A printing method comprising printing a convex character 20 on the surface of the substrate 1 to be printed with the inks 17 and 18. A plurality of types of inks 17 and 18 are filled in the cylinder 13 in a state of being divided in the circumferential direction of the cylinder 13 of the dispenser 6,
A printing method characterized in that the convex characters (20) are printed on the surface of the substrate (1) to be printed by the inks (17, 18) being pushed downward and being discharged from the nozzles (15) of the dispenser (6). 3. The printing method according to claim 2, wherein the cylinder 13 of the dispenser 6 filled with the inks 17 and 18 rotates in the circumferential direction. A plurality of types of inks 17 and 18 are filled in the cylinder 13 while rotating in the circumferential direction of the cylinder 13 of the dispenser 6,
A printing method characterized in that the convex characters (20) are printed on the surface of the substrate (1) to be printed by the inks (17, 18) being pushed downward and being discharged from the nozzles (15) of the dispenser (6). A printed material, wherein the convex characters 20 are printed with an ink containing a plurality of types of inks 17 and 18 in a semi-mixed state. In a printing ink for printing the convex characters 20 on the surface of the substrate 1 to be printed,
A printing ink characterized in that a plurality of types of inks 17 and 18 are contained in a semi-mixed state.

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