JP7417278B2 - Packaging sheet for PTP - Google Patents

Description

The present invention relates to a packaging sheet for PTP that uses aluminum foil as a base material, and particularly to a packaging sheet for PTP that has a counterfeit prevention function.

PTP (press through package) is a PTP packaging body 10 shown in FIG. This is a packaging form in which the concave portion 12a is closed by adhering to the flat portion 12b, and is widely used for packaging medicinal tablets, capsules, etc.

In recent years, in order to prevent counterfeit medicines from being distributed in the market, there has been a strong demand for PTP packaging sheets to have a counterfeit prevention function so that it can be determined whether the medicines are genuine or counterfeit. There is.

Conventionally, the technical field is different from packaging sheets for PTP, but as disclosed in Patent Document 1, for example, voting tickets used in horse racing, bicycle racing, etc. By filling in a barcode printed on a substrate using ink with relatively flat absorption characteristics with ink whose spectral absorption in the visible region is much larger than that in the infrared region. There was a voting ticket whose barcode could be read using an infrared light detection element, although it was not visible to the naked eye. According to this configuration, even if the voting ticket is so elaborately forged that it cannot be seen with the naked eye, the authenticity can be easily determined using an infrared image, making it difficult to forge or alter the ticket and deter counterfeiting. Regarding packaging sheets for PTP, for example, as disclosed in Patent Document 2, a display with excellent infrared transparency is printed on the surface of an aluminum foil body using printing ink containing a predetermined white pigment. There was aluminum foil for packaging. According to this aluminum foil for packaging, the aluminum foil body is imaged by irradiating infrared rays in the inspection process, and the captured infrared image shows that defects such as scratches, cracks, holes, or foreign objects are detected in the aluminum foil body. It is possible to determine whether or not it exists.

Japanese Unexamined Patent Publication No. 58-45999 Japanese Patent Application Publication No. 2005-132460

The voting ticket technology of Patent Document 1 is assumed to be printed mainly on a paper base material, and does not disclose the optimal configuration for a PTP packaging sheet using aluminum foil as a base material.

The packaging aluminum foil of Patent Document 2 is similar to the technology of Patent Document 1, in which display is performed using infrared-transparent printing ink and inspection is performed using an infrared image, but the purpose is The purpose of this method is to detect defects in the aluminum foil body, and the structure is very simple, so it is not effective enough to deter counterfeiting by malicious criminals.

The present invention has been made in view of the above-mentioned background art, and is applicable to PTP, where it is difficult to notice that the appearance of the display provided on the surface of the aluminum foil differs between visual inspection and infrared image, and it is difficult to counterfeit. The purpose is to provide packaging sheets for

The present invention is a packaging sheet for PTP used as a lid material for closing the opening of a recess formed in a container sheet, and the present invention has a first black ink marking on the surface side of an aluminum foil that is a base material. The first black ink is an ink containing a black colorant, and when the ink is imaged, both the visible image and the infrared image are black. The second black ink is an ink containing a plurality of chromatic colorants including cyan, magenta, and yellow, and when the ink is imaged, it appears black in the visible image, This is a packaging sheet for PTP, which is an infrared transparent ink that is not recognized in infrared images. The first black ink is preferably an ink obtained by adding a black pigment to the second black ink.

A display using diluted white ink is provided on the surface side of the aluminum foil, and the diluted white ink is an ink in which a white colorant is blended with a transparent coating resin, and when the ink is imaged, a visible image is formed. The diluted white ink is an ink that appears translucent and white in both the black ink and the infrared image, and the diluted white ink display is provided so as to overlap below the second black ink display. In this case, the display using the second black ink is provided by covering the aluminum foil, the display using the diluted white ink, and the display using the first black ink with a solid layer of the second black ink; The thickness of the solid layer of the second black ink is preferably set to be so thin that the display using the diluted white ink can be recognized when visually observed from the outside.

The present invention also provides a packaging sheet for PTP used as a lid material for closing the opening of a recess formed in a container sheet, in which an indication using diluted white ink is provided on the surface side of an aluminum foil that is a base material. , a solid layer of chromatic ink covering the display made of the aluminum foil and the diluted white ink is provided, and the diluted white ink is an ink in which a white coloring agent is blended with a transparent coating resin, and the ink is When photographed, the ink appears translucent white in both visible and infrared images, and the chromatic ink is an ink containing a plurality of chromatic colorants including cyan, magenta, and yellow. When the ink is imaged, it appears as a predetermined chromatic color in the visible image, but is an infrared transmitting ink that is not recognized in the infrared image, and the thickness of the solid layer of the chromatic ink is the same as the dilution when visually observed from the outside. This is a packaging sheet for PTP that is thin enough to recognize the white ink markings.

A heat-resistant coating layer is provided to cover the solid layer of the chromatic ink, and the heat-resistant coating layer is made of a transparent or translucent synthetic resin to which a granular matting agent is added, and some of the particles of the matting agent are By protruding from the surface of the synthetic resin, irregularities are formed, and the visible light passing through the heat-resistant coating layer is scattered by the irregularities.

Between the aluminum foil and the solid layer of chromatic ink, an indication using the diluted white ink and an indication using a first black ink are arranged side by side, and the first black ink is blended with a black colorant. The ink is an ink that appears black in both the visible image and the infrared image when the ink is imaged, and the thickness of the solid layer of the chromatic ink is the same as that of the diluted white ink when visually observed from the outside. The display is set to be so thin that both the display using the black ink and the display using the first black ink can be recognized. Further, another display using the diluted white ink may be provided on the surface side of the solid layer of the chromatic ink.

The packaging sheet for PTP of the present invention has a unique display that combines multiple types of ink with different infrared light transmittances, so it is easy to determine authenticity by using visible and infrared images. It can be carried out. In addition, even if you look at the display under visible light, it is difficult to notice that the appearance changes between the visual (visible image) and the infrared image, and even if you do notice, it is difficult to understand the method and mechanism of the change and imitate it. Since this is difficult, counterfeiting by malicious criminals can be effectively deterred.

They are a vertical cross-sectional view (a) showing one form of a packaging sheet for PTP , a visible image (b) and an infrared image (c) of a specific portion viewed from the heat-resistant coating layer side. They are a vertical cross-sectional view (a) showing a modified example of a packaging sheet for PTP of this form , a visible image (b) and an infrared image (c) of a specific portion viewed from the heat-resistant coating layer side. They are a vertical cross-sectional view (a) showing a first embodiment of a packaging sheet for PTP of the present invention, a visible image (b) and an infrared image (c) of a specific portion viewed from the heat-resistant coating layer side. They are a vertical cross-sectional view (a) showing a modified example of the PTP packaging sheet of the first embodiment, a visible image (b) and an infrared image (c) of a specific portion viewed from the heat-resistant coating layer side. They are a vertical cross-sectional view (a), a visible image (b) and an infrared image (c) of a specific portion viewed from the heat-resistant coating layer side, showing a second embodiment of the packaging sheet for PTP of the present invention. A vertical cross-sectional view (a) showing a first modified example of the PTP packaging sheet of the second embodiment, a visible image (b) and an infrared image (c) of a specific portion viewed from the heat-resistant coating layer side. be. They are a vertical cross-sectional view (a) showing a second modified example of the PTP packaging sheet of the second embodiment, and a visible image (b) of a specific portion viewed from the heat-resistant coating layer side. A vertical cross-sectional view (a) showing a third modification of the packaging sheet for PTP of the second embodiment, a visible image (b) and an infrared image (c) of a specific portion viewed from the heat-resistant coating layer side. be. They are a front view (a), a back view (b), and an AA sectional view (c) showing the structure of a general PTP package.

Hereinafter, one form of a packaging sheet for PTP, which is the basis of the present invention, will be explained based on FIG. 1. The PTP packaging sheet 18 of this embodiment is a member used as a lid material to close the opening of the recess 12a formed in the container sheet 12, and is used in place of the conventional packaging sheet 16 shown in FIG. It is something.

As shown in FIG. 1, the packaging sheet 18 has an aluminum foil 20 as a base material, and an indication 22h of the first black ink 22 and an indication 24h of the second black ink 24 are arranged side by side on the front side of the aluminum foil 20. It is set up.

The second black ink 24 is an ink containing colorants such as a plurality of chromatic pigments including cyan, magenta, and yellow. It is an infrared transparent ink that cannot be recognized in infrared images. The display 24h of the second black ink 24 is a character string "SHL" and is formed by printing the second black ink 24 using a gravure coating method or the like and drying it.

The first black ink 22 is an ink obtained by adding a small amount of coloring agent such as a black pigment to the second black ink 24, and when an image is taken of this ink, the ink appears black in both a visible image and an infrared image. It is. A feature of the first black ink 22 is that it appears to have a very similar hue to the second black ink 24 in the visible image. For example, in the case of black ink that uses black pigment as the main coloring agent, it appears to be a very dark black or deep black in the visible image, but the first black ink 22, like the second black ink, is a slightly lighter black or black color. It looks a little pale black. Therefore, it is difficult to visually distinguish the first and second black inks 22, 24.

The display 22h using the first black ink 22 is a character string "SHL" having the same shape as the above display 24h, and is formed by printing the first black ink 22 using a gravure coating method or the like and drying it. .

The front side of the aluminum foil 20 and the displays 22h and 24h are covered with a transparent or semitransparent heat-resistant coating layer 26. The heat-resistant coating layer 26 is heated when the packaging sheet 18 is thermally bonded to the flat part 12b of the container sheet 12, so for example, a pressure of 3 kg/cm ² and 2 seconds is applied with a heat seal bar at 190 to 230°C. Therefore, heat resistance that satisfies conditions such as no change in surface condition such as discoloration, carbonization, or stickiness is required. Therefore, it is preferable for the heat-resistant coating layer 26 to be made of a coating agent containing epoxy resin, nitrocellulose, or acrylic resin as a main ingredient.

The back side of the aluminum foil 18 is covered with a heat seal layer 28. The heat sealing layer 28 is a layer that is welded to the flat portion 12b of the container sheet 12 when the packaging sheet 18 is thermally bonded to the container sheet 12, and a material that can bond the container sheet 12 and the aluminum foil 18 well is selected. . For example, when the material of the container sheet 12 is polyvinyl chloride resin (PVC resin), the material of the heat seal layer 28 is preferably a mixture of polyvinyl chloride resin (PVC resin) and polyester resin.

Next, a visible image and an infrared image when the packaging sheet 18 is imaged from the heat-resistant coating layer 26 side will be explained. The visible image is an image in which visible light reflected from the packaging sheet 18 is detected, and the infrared image is an image in which infrared light reflected from the packaging sheet 18 is detected.

FIG. 1(b) shows a visible image. Most of the visible light irradiated to the display area 22h is absorbed by the first black ink 22, but a portion passes through the first black ink 22 and is reflected by the aluminum foil 20, and this reflected light The ink passes through the first black ink 22 and reaches the imaging device, where the metallic color of aluminum is detected. Therefore, the display area 22h in the visible image appears to be black with a slight metallic color of aluminum (slightly bright black). Similarly, the display area 24h in the visible image also appears to be black with a slight metallic color of aluminum (slightly bright black), and is difficult to distinguish from the display area 22h.

Most of the visible light irradiated onto the background region without the displays 22h and 24h is reflected by the aluminum foil 20, and this reflected light reaches the imaging device, where the metallic color of the aluminum is detected. Therefore, the background area in the visible image appears solid with the metallic color of aluminum.

FIG. 1(c) shows an infrared image taken of the same area. Most of the infrared light irradiated to the display area 22h is absorbed by the first black ink 22, but a portion passes through the first black ink 22 and is reflected by the aluminum foil 20, and the reflected light is passes through the first black ink 22, reaches the imaging device, and is detected. Therefore, the display area 22h in the infrared image appears to be black with a little white (slightly bright black).

On the other hand, most of the infrared light irradiated to the display area 24h passes through the second black ink 24 (infrared transmitting ink) and is reflected by the aluminum foil 20, and this reflected light passes through the second black ink 24. It passes through and reaches the imaging device, where it is detected as white. Therefore, the area of display 24h in the infrared image appears bright white.

Most of the infrared light irradiated onto the background area without the displays 22h and 24h is reflected by the aluminum foil 20, and this reflected light reaches the imaging device and is detected as white. Therefore, the background region in the visible image appears bright white and is difficult to distinguish from the display 24h region.

As mentioned above, since the packaging sheet 18 has a unique display that combines multiple types of ink with different infrared light transmittances, it is easy to determine authenticity by using visible images and infrared images. It can be carried out. Further, even if the display is viewed at a glance under visible light, the user cannot recognize that the inks of the displays 22h and 24h are different, nor do they notice that one display becomes invisible in the infrared image. Even if they were noticed, it would be difficult to elucidate the mechanism of change and imitate it, so it would be possible to effectively deter malicious criminals from counterfeiting.

Next, a modified example of the packaging sheet 18 will be described based on FIG. 2. The packaging sheet 18x of the modification is the same as the packaging sheet 18 except that the first black ink 22 (indication 22h) is replaced with the first black ink 30 (indication 30h).

The first black ink 30 is an ink whose main colorant is a black pigment or the like. Therefore, when the first black ink 22 is imaged, it appears black in both the visible image and the infrared image. However, as described above, the first black ink 22 appears as a slightly brighter black or slightly lighter black in the visible image, whereas the first black ink 30 appears as a very dark or deep black. Therefore, the first and second black inks 30 and 24 can be distinguished by careful visual inspection.

FIG. 2(b) shows a visible image taken from the heat-resistant coating layer 26 side of the packaging sheet 18x. Most of the visible light irradiated onto the area of the display 30h is absorbed by the first black ink 30, so that almost no reflected light is detected by the imaging device. Therefore, the area of display 30h in the visible image appears dark black or deep black.

The appearance of the region of the display 24h in the visible image and the appearance of the background region without the displays 22h and 24h are the same as those of the packaging sheet 18 described above. That is, the area of the display 24h appears to be black with a little bit of the metallic color of aluminum (slightly bright black), and the background area appears to be a solid color of the metallic color of aluminum.

FIG. 2(c) shows an infrared image taken of the same part. As in the case of visible light, most of the infrared light irradiated onto the display area 30h is absorbed by the first black ink 30, so that almost no reflected light is detected by the imaging device. Therefore, the area of display 30h in the visible image appears dark black or deep black.

The appearance of the display 24h area in the infrared image and the appearance of the background area without the displays 22h and 24h are the same as in the case of the packaging sheet 18 described above, and the display 24h area appears bright white, and the background area does not appear. The area also appears bright white.

In this way, in the case of the packaging sheet 18x, the first black ink 22 is changed to the first black ink 30, so in the visible image, the black appearance in the display 30h area and the display 24 area are different. There is a slight difference in the appearance of the black color, and it is easy to notice that different inks are used for the displays 24h and 30h, which is a major difference from the packaging sheet 18. However, as in the case of the packaging sheet 18, it is difficult to notice that only one display becomes invisible in the infrared image, and even if one does notice, it is difficult to understand and imitate the mechanism by which the appearance changes. Since this is not easy, counterfeiting by malicious criminals can be effectively deterred.

Next, a first embodiment of the packaging sheet for PTP of the present invention will be described based on FIG. 3. Here, structures similar to those of the packaging sheets 18, 18x are given the same reference numerals and description thereof will be omitted. The PTP packaging sheet 32 of this embodiment is a member used as a lid material to close the opening of the recess 12a formed in the container sheet 12, and is used in place of the conventional packaging sheet 16 shown in FIG. It is something.

The packaging sheet 32 has, on the surface side of the aluminum foil 20, an indication 30h of "SHL" made with the first black ink 30 used in the above-mentioned packaging sheet 18x, and an indication 34h of "SHL" made with the diluted white ink 34. They are installed in parallel. The second black ink 24 is layered on the diluted white ink 34, so that the display 24h and the display 34h overlap. A heat-resistant coating layer 26 and a heat-sealing layer 28 are also provided in the same manner.

The diluted white ink 34 is an ink in which a coloring agent such as a white pigment is blended into a transparent coating resin, and when an image of this ink is captured, it appears translucent white in both a visible image and an infrared image. . The display 34h of the diluted white ink 34 is formed by printing the diluted white ink 34 using a gravure coating method or the like and drying it.

Furthermore, in the case of the packaging sheet 32, the marking 24h of the second black ink 24 is characterized in that it is provided as part of a solid layer of the second black ink 24 that covers the aluminum foil 20 and the markings 30h, 34h. . The thickness of the solid layer of the second black ink 24 is set to be so thin that the display 34h of the diluted white ink 34 is recognized when visually observed from the outside.

Hereinafter, the area other than the display 24h in this solid layer will be referred to as the solid part 24b of the second black ink 24. Note that a part of the solid layer of the second black ink 24 covers the display 30h of the first black ink 30, but since it is the same black color, it hardly affects the appearance of the display 30h.

Next, a visible image and an infrared image when the packaging sheet 32 is imaged from the heat-resistant coating layer 26 side will be described.

FIG. 3(b) shows a visible image. Most of the visible light irradiated onto the display area 30h is absorbed by the second black ink 24 and the first black ink 30, so that almost no reflected light is detected by the imaging device. Therefore, the area of display 30h in the visible image appears dark black or deep black.

Most of the visible light irradiated to the display areas 24h and 34h is absorbed by the second black ink 24, but some of it passes through the second black ink 24 and is reflected by the diluted white ink 34. The reflected light passes through the second black ink 24 and reaches the imaging device. However, since the diluted white ink 34 does not have a high light reflectance like the aluminum foil 20, less reflected light reaches the imaging device. Therefore, the regions of display 24h and 34h in the visible image appear dark black or deep black, and are difficult to distinguish from the region of display 30h.

Part of the visible light irradiated onto the solid area 24b is absorbed by the second black ink 24, but part of it passes through the second black ink 24 and is reflected by the aluminum foil 20. The light passes through the second black ink 24 and reaches the imaging device. Since the aluminum foil 20 has a high light reflectance, the metallic color of aluminum can also be detected by the imaging device. Therefore, the area of the solid portion 24b in the visible image appears to be a mixture of black and the metallic color of aluminum (slightly bright black), and can be distinguished from the area of the display 30h and the areas of the displays 24h and 34h.

FIG. 3(c) shows an infrared image. Although the infrared light irradiated to the display area 30h passes through the second black ink 24 (infrared transmitting ink), most of it is absorbed by the first black ink 30, so most of the reflected light is reflected by the imaging device. Not detected. Therefore, the display area 30h in the infrared image appears dark black or deep black.

The infrared light irradiated to the display areas 24h and 34h passes through the second black ink 24 (infrared transmitting ink) and is reflected by the diluted white ink 34, and the reflected light passes through the second black ink 24. The image reaches the imaging device and is detected as gray. Also, a part of the light passes through the diluted white ink 34 and is reflected by the aluminum foil 20, and the reflected light passes through the white ink 34 and the second black ink 24, reaches the imaging device, and is detected as a bright white color. . Therefore, the display areas 24h and 34h in the infrared image appear to be a mixture of gray and white (slightly bright gray).

The infrared light irradiated onto the area of the solid portion 24b passes through the second black ink 24 (infrared transparent ink) and is reflected by the aluminum foil 20, and the reflected light passes through the second black ink 24. It reaches the imaging device and is detected as white. Therefore, the area of the solid portion 24b in the infrared image appears bright white and can be distinguished from the bright gray displays 24h and 34h.

As described above, since the packaging sheet 32 has a unique display that combines multiple types of ink with different infrared transmittances, authenticity can be easily determined by using visible images and infrared images. I can do it. In addition, even if you look at the display under visible light, it is difficult to notice that the appearance changes between the visual (visible image) and the infrared image. Since it is difficult to do so, counterfeiting by malicious criminals can be effectively deterred.

Next, a modified example of the packaging sheet 32 will be described based on FIG. 4. The packaging sheet 32x of the modification is the same as the packaging sheet 32 except that the solid portion 24b of the second black ink 24 of the packaging sheet 32 is omitted. When the packaging sheet 32x is visually observed, the background of the aluminum foil 20 can be seen in the background area of the packaging sheet 32 display 30h and displays 24h, 34h, so the unique texture due to the metallic luster can be utilized in the design. Note that, compared to the packaging sheet 32, there are fewer places where appearance changes between visual observation (visible image) and infrared image, but substantially the same counterfeit deterrent effect can be obtained.

Next, a second embodiment of the packaging sheet for PTP of the present invention will be described based on FIG. 5. Here, the same configuration as the packaging sheet 32 described above is given the same reference numeral and the description thereof will be omitted. The PTP packaging sheet 36 of this embodiment is a member used as a lid material to close the opening of the recess 12a formed in the container sheet 12, and is used in place of the conventional packaging sheet 16 shown in FIG. It is something.

The packaging sheet 36 has, on the surface side of the aluminum foil 20, an indication 30h of "SHL" made with the first black ink 30 used in the above-mentioned packaging sheet 32 and an indication 34h of "SHL" made with the diluted white ink 34. It is set up. A heat seal layer 28 is also provided in the same manner.

Further, in the packaging sheet 36, the aluminum foil 20, the display 30h of the first black ink 30, and the display 34h of the diluted white ink 34 are covered with a solid layer of chromatic ink 38, and a heat-resistant coating layer 26 is provided on the outside thereof. It has the characteristic of being The thickness of the solid layer of the chromatic ink 38 is set to be thin enough to recognize the display 30h of the first black ink 30 and the display 34h of the diluted white ink 34 when visually observed from the outside.

The chromatic ink 38 is an ink that is a mixture of colorants such as a plurality of chromatic pigments including cyan, magenta, and yellow. When an image of this is captured, it appears as a predetermined chromatic color in a visible image, and appears as a predetermined chromatic color in an infrared image. It is an infrared transparent ink that is not recognized. Any chromatic color may be selected, but indigo, which has a relatively calm hue, is selected here. The solid layer of the chromatic ink 38 is formed by printing the chromatic ink 38 using a gravure coating method or the like and drying it.

Hereinafter, the area in the solid layer of the chromatic ink 38 that overlaps with the display 30h will be referred to as a display 38h (30) of the chromatic ink 38. Further, an area overlapping with the display 34h is referred to as a display 38h (34) formed by the chromatic ink 38. The area other than this is referred to as a solid area 38b of the chromatic ink 38.

Next, a visible image and an infrared image when the packaging sheet 36 is imaged from the heat-resistant coating layer 26 side will be described.

FIG. 5(b) shows a visible image. Part of the visible light irradiated onto the display areas 30h and 38h (30) is reflected by the chromatic ink 38, and the reflected light reaches the imaging device and is detected as indigo. Further, a part of the ink passes through the chromatic ink 38, reaches the first black ink 30, and is absorbed. Therefore, the display areas 30h and 38h (30) in the visible image appear to be a mixture of black and indigo (bluish black).

Part of the visible light irradiated onto the display areas 34h and 38h (34) is reflected by the chromatic ink 38, and the reflected light reaches the imaging device and is detected as indigo. Further, a portion of the light passes through the chromatic ink 38 and is reflected by the diluted white ink 34, and the reflected light passes through the chromatic ink 38 and reaches the imaging device. However, since the diluted white ink 32 does not have a high light reflectance like the aluminum foil 20, less reflected light reaches the imaging device. Therefore, the display areas 34h and 38h (34) in the visible image appear dark blue or deep blue.

A portion of the visible light irradiated onto the solid area 38b is reflected by the chromatic ink 38, and the reflected light reaches the imaging device and is detected as indigo. Further, a part of the light passes through the chromatic ink 38 and is reflected by the aluminum foil 20, and the reflected light passes through the chromatic ink 38 and reaches the imaging device. Since the aluminum foil 20 has a high light reflectance, the imaging device can also detect the metallic color of aluminum. Therefore, the area of the solid portion 38b in the visible image appears to be a color that is a mixture of blue and a little metallic color of aluminum (slightly bright blue), and the area of the displays 30h and 38h (30) and the areas of the displays 34h and 38h (34) can be distinguished from the area of

FIG. 5(c) shows an infrared image. Although the infrared light irradiated to the display areas 30h and 38h (30) passes through the chromatic ink 38 (infrared transmitting ink), most of it is absorbed by the first black ink 30, so it is not reflected by the imaging device. Almost no light is detected. Therefore, the display areas 30h and 38h (30) in the infrared image appear dark black or deep black.

The infrared light irradiated to the areas indicated by 34h and 38h (34) passes through the chromatic ink 38 (infrared transmitting ink) and is reflected by the diluted white ink 34, and the reflected light passes through the chromatic ink 38. The image reaches the imaging device and is detected as gray. Further, a part of the light passes through the diluted white ink 34 and is reflected by the aluminum foil 20, and the reflected light passes through the white ink 34 and the chromatic ink 38, reaches the imaging device, and is detected as bright white. Therefore, the display areas 34h and 38h (34) in the infrared image appear to be a mixture of gray and white (slightly bright gray).

The infrared light irradiated onto the area of the solid portion 38b passes through the chromatic ink 38 (infrared transmitting ink) and is reflected by the aluminum foil 20, and the reflected light passes through the chromatic ink 38 and reaches the imaging device. and is detected as white. Therefore, the area of the solid portion 38b in the infrared image appears bright white and can be distinguished from other areas.

As described above, since the packaging sheet 36 has a unique display that combines multiple types of ink with different infrared transmittances, authenticity can be easily determined by using visible images and infrared images. I can do it. In addition, even if you look at the display under visible light, it is difficult to notice that the appearance changes between the visual (visible image) and the infrared image. Since it is difficult to do so, counterfeiting by malicious criminals can be effectively deterred. In addition, in the case of the above-mentioned packaging sheets 18 and 32, only ink that visually appears black or white is used, but this packaging sheet 36 can use an appropriate chromatic ink 38, so it is generally It is possible to provide users with a good-looking design.

Next, three modified examples of the packaging sheet 36 will be explained in order based on FIGS. 6 to 8. As shown in FIG. 6, the packaging sheet 36x of the first modification example omits the display 30h of the first black ink 30 that the packaging sheet 36 has, and the other configurations are the same as the packaging sheet 36. . Compared to the packaging sheet 32, although there is less change in appearance between visual observation (visible image) and infrared image display, it is possible to obtain an excellent forgery deterrent effect above a certain level.

As shown in FIG. 7, the packaging sheet 36y of the second modification is one in which the heat-resistant coating layer 26 of the packaging sheet 36 is replaced with a heat-resistant coating layer 26x having unevenness 40 on the surface, and other configurations. is similar to the packaging sheet 36. The heat-resistant coating layer 26x is formed by adding a granular matting agent to a transparent or translucent synthetic resin, and causing some of the granules of the matting agent to protrude from the surface of the synthetic resin, thereby forming the unevenness 40.

The unevenness 40 functions to scatter visible light passing through the heat-resistant coating layer. Therefore, when viewing the packaging sheet 36y under visible light, the brightness or shading of the indigo color in the display areas 34 and 38h (34) appears to change greatly between when viewed from the front and when viewed from an oblique direction. . For example, as shown in FIG. 7(b), when the area of display 34, 38h (34) is viewed from the front, it appears dark indigo (or deep indigo), but when viewed from an oblique direction, , the indigo color appears so bright that it cannot be distinguished from the indigo color of the solid portion 38b. Note that the appearance of the display areas 30, 38h (30) and the solid portion 38b does not change much whether or not the unevenness 40 is present.

Since the packaging sheet 36y has a more complicated display appearance than the packaging sheet 36, it is even more difficult to imitate.

As shown in FIG. 8, the packaging sheet 36z of the third modification has the same structure as the diluted white ink 34 between the solid layer of the chromatic ink 38 and the heat-resistant coating layer 26x, in addition to the structure of the packaging sheet 36y. Another display 34xh is added using ink (diluted white ink 34x), and the other configurations are the same as the packaging sheet 36y.

FIG. 8(b) is a visible image of the packaging sheet 36z, in which most of the visible light irradiated to the display area 34xh is reflected by the diluted white ink 34x, and the reflected light reaches the imaging device and is detected as white. Ru. Further, a portion of the light passes through the diluted white ink 34x and is reflected by the chromatic ink 38, and the reflected light passes through the diluted white ink 34x and reaches the imaging device. Therefore, the area indicated by 34xh in the visible image appears to be white with some indigo mixed in. The appearance of the other areas and the solid portion 38b is as described above, and the white color of the display 34xh area can be distinguished from the bright indigo color of the solid portion 38b.

FIG. 8(c) is an infrared image of the packaging sheet 36z, where most of the infrared light irradiated to the display area 34xh is reflected by the diluted white ink 34x, and the reflected light reaches the imaging device and turns gray. Detected. Further, a part of the light passes through the diluted white ink 34x and the chromatic ink 38 (infrared transmitting ink) and is reflected by the aluminum foil 20, and the reflected light passes through the chromatic ink 38 and the diluted white ink 34x and is then transmitted to the imaging device. reach. Therefore, the area indicated by 34xh in the visible image appears to be a mixture of gray and white (slightly bright gray). The appearance of the other areas and the solid portion 38b is as described above, and the area indicated by the display 34xh can be distinguished from the bright white color of the solid portion 38b.

Since the packaging sheet 36z has a more complicated display appearance than the packaging sheet 36y, it is even more difficult to imitate.

Note that the packaging sheet for PTP of the present invention is not limited to the above embodiment. For example, the blending ratio of colorants such as pigments in each ink is not strictly regulated, but can be adjusted as appropriate by evaluating the appearance of visible and infrared images taken of prototype packaging sheets. . The coloring agent of the ink may be a dye in addition to a pigment, and a pigment ink or a dye ink can be appropriately selected depending on the purpose.

The contents of the ink display and the size of the display are not particularly limited, and instead of characters such as "SHL", figures or design drawings may be displayed.

The printing method of each ink is not particularly limited, but as in the first black ink 30 (indication 30h) and diluted white ink 34 (indication 34h) shown in FIGS. 3 and 5, a solid layer of another chromatic ink is used. Regarding the ink to be covered, it is preferable to print using a gravure coating method. When printing with the gravure coating method, the edges of the ink display (the outline of the display) tend to be a little higher than the center, so the difference between the display areas 30h and 34h and the adjacent areas in the visible image The boundaries become clearer, and the displays 30h and 34h can be clearly seen by general users.

10 PTP package 12 Container sheet 12a Concave portions 16, 18, 18x, 32, 32x, 36, 36x, 36y, 36z Packaging sheet 20 Aluminum foil 22, 30 First black ink 22h, 24h, 30h, 34h, 38h (30 ), 38h(34) Display 24b, 38b Solid area 24 Second black ink (infrared transmitting ink)
26, 26x Heat-resistant coating layer 34 Diluted white ink 38 Chromatic ink (infrared transmitting ink)
40 Unevenness

Claims (6)

In a packaging sheet for PTP used as a lid material for closing the opening of a recess formed in a container sheet,
A first black ink display and a second black ink display are placed side by side on the surface side of the aluminum foil that is the base material,
The first black ink is an ink containing a black material, and when the ink is imaged, it appears black in both a visible image and an infrared image,
The second black ink is an ink containing a plurality of chromatic colorants including cyan, magenta, and yellow, and when the ink is imaged, it appears black in the visible image and is not recognized in the infrared image. It is an infrared transparent ink,
Furthermore, an indication using diluted white ink is provided on the surface side of the aluminum foil,
The diluted white ink is an ink in which a white colorant is blended with a transparent coating resin, and when the ink is imaged, it appears translucent white in both visible images and infrared images,
A packaging sheet for PTP , characterized in that the diluted white ink display is provided so as to overlap below the second black ink display . The PTP packaging sheet according to claim 1, wherein the first black ink is an ink obtained by adding a black colorant to the second black ink. The display using the second black ink is provided by covering the aluminum foil, the display using the diluted white ink, and the display using the first black ink with a solid layer of the second black ink,
3. The packaging sheet for PTP according to claim 1 , wherein the thickness of the solid layer of the second black ink is set to be thin enough to allow the indication by the diluted white ink to be recognized when viewed from the outside. In a packaging sheet for PTP used as a lid material for closing the opening of a recess formed in a container sheet,
A display using diluted white ink and a solid layer of chromatic ink covering the aluminum foil and the display using the diluted white ink are provided on the surface side of the aluminum foil that is the base material,
The diluted white ink is an ink in which a white colorant is blended with a transparent coating resin, and when the ink is imaged, it appears translucent white in both visible images and infrared images,
The chromatic ink is an ink containing a plurality of chromatic colorants selected from cyan, magenta, and yellow, and when the ink is imaged, it appears as a predetermined chromatic color in a visible image, and appears as a predetermined chromatic color in an infrared image. It is an infrared transparent ink that is not recognized.
The thickness of the solid layer of the chromatic ink is set to be thin enough that the display using the diluted white ink is recognized when visually observed from the outside ,
Between the aluminum foil and the solid layer of chromatic ink, the display using the diluted white ink and the display using the first black ink are arranged side by side,
The first black ink is an ink containing a black colorant, and when the ink is imaged, it appears black in both a visible image and an infrared image,
The thickness of the solid layer of the chromatic ink is set so thin that both the diluted white ink display and the first black ink display are recognized when visually observed from the outside. Packaging sheet for PTP. A heat-resistant coating layer is provided to cover the solid layer of the chromatic ink,
The heat-resistant coating layer is made by adding a granular matting agent to a transparent or translucent synthetic resin, and some of the particles of the matting agent protrude from the surface of the synthetic resin to form unevenness. 5. The packaging sheet for PTP according to claim 4 , wherein visible light passing through the heat-resistant coating layer is scattered. 6. The packaging sheet for PTP according to claim 4 , wherein another display using the diluted white ink is provided on the surface side of the solid layer of the chromatic ink.

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