JP2003266978A - Scratch card and method for manufacturing it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a scratch card in which there exists no possibility of reflecting unevenness caused by inherent data as recording information printed on the scratch card to a metal foil on the surface, in other words, the surface of the metal foil can be smoothly held and in addition, it can be prevented from occurring that contents of the printed inherent data such as letters and picture patterns can be visually confirmed by a user by passing a visible light through the scratch card without scraping the (metal) foil. <P>SOLUTION: In the scratch card, the inherent data are printed on at least one face of a base material; an undercoat layer is formed; and an opaque opacifying layer being releasable and having scratch properties covering the inherent data and the undercoat layer is formed. The undercoat layer comprises a thermoplastic resin, and the undercoat layer and the inherent data form an integrated layer, and the top face of the inherent data and the top face of the undercoat layer being a boundary face of the opacifying layer are the same and approximately flat face. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention uses a nail, a coin, or the like on the surface of a surface of a finger or a coin to visually read and use unique data such as characters and figures, an image, a personal identification code, and a management number hidden by a hiding layer. The present invention relates to a scratch card for scraping off a hiding layer and a method for manufacturing the scratch card.

[0002]

2. Description of the Related Art A card in which a user can obtain hidden unique data by scraping off a concealing layer on the surface with a nail or a coin is called a scratch card. As a product that uses the scratch card mechanism, the pre-paid is used for the payment of charges for speed lottery tickets, lottery tickets, international calls, mobile phones, etc., which can be seen on the spot by removing the hidden layer Widely used as cards, etc.

As a conventional example of the structure of a scratch card (scratch sheet), there is a printed matter described in Japanese Utility Model Publication No. 44-12094. An embodiment of the printed matter according to the present invention is shown in FIG. FIG. 4A is a cross-sectional view of an example of a printed material, and FIG. 4B is a cross-sectional view showing a case where a part of the surface is scraped off. A printed image 42 is created on the surface of the paper 41 in FIG. 4 (a). The printed image 42 is formed by mixing wax and the like in a medium composed of synthetic resin, vegetable oil, petroleum solvent and desiccant. The structure is buried in the inside of the medium layer 43. A print image 44 is provided on the surface of the medium layer 43 in order to hide the print image 42. When the user scrapes off the surface layer of this printed matter, as shown in FIG. 4B, both the medium layer 43 and the printed image 44 are scraped off, and the printed image 42 hidden below appears. Similar results are obtained when a plastic film or the like is used instead of the paper 41.

In the conventional example described in Japanese Utility Model Publication No. 44-12094, the print image 42 and the medium layer 43 are formed at least twice (three times including the formation of the print image 44) in order to form each layer. Printing and coating processes are required. Of these, offset printing, gravure printing, or the like is usually performed to create the print images 42 and 44, and screen printing is performed to form the medium layer 43. As described above, since a plurality of printing processes of different methods are required, the above-mentioned conventional example has a drawback that its production is expensive. Methods for solving this problem are disclosed in JP-A-63-21082 and JP-A-2000-25.
Proposed in each publication of 374.

FIG. 5 is an explanatory view of a conventional manufacturing process of a scratch sheet according to Japanese Patent Laid-Open No. 63-21082. FIG. 6 is a perspective view of a scratch card, which is a conventional example of a scratch sheet disclosed in Japanese Patent Laid-Open No. 2000-25374. In each of the embodiments described in both publications, a metal foil is used as the concealing material on the surface, special printing such as screen printing is abolished, and the manufacturing cost of the scratch card (scratch sheet) is reduced.

Of these, FIGS. 5 (1) to 5 (4) are flowcharts sequentially showing an embodiment of the process for manufacturing a scratch card in Japanese Patent Laid-Open No. 63-21082. In FIG. 5, (1) First, the display content 52 is printed on the mount 51 with UV ink, and then (2) the printing surface 53 is formed with transparent UV ink so as to cover the display content 52. Then, (3) a foil 54 made of a blocking foil or the like that does not cause biting to the UV ink is pressed, and finally (4) a portion protruding from a necessary scratch area is removed by a kiss cut or punching technique. The UV ink and the foil do not stick to each other, but the back surface of the foil 54 acts so that they do not come off. However, when the user scrapes off the concealed material on the surface, it is possible to completely remove the metal foil without leaving the metal foil because of the property that they do not bite each other.

[0007] On the other hand, FIG.
It is a fragmentary perspective view of a scratch card, which is a typical example of a scratch sheet in the publication. Scratch card 61
Is one in which characters 65 and the like are printed on a recording surface 64 on an ink receiving layer 63 provided on a base material 62, and a protective layer 66 and two metal foils 67 and 68 are provided thereon. Base material 6
Reference numeral 2 is a paper or a plastic film, and the ink receiving layer 63 has a role of enhancing printability of characters such as characters by a printing ink or characters as a printed matter of a figure 65. Characters etc. 6
A transparent protective layer 66 is provided on the surface of 5.

Finally, two layers of metal foils 67 and 68 are provided on the surface of the protective layer 66. The protective layer 66 is a layer overcoated with varnish or lacquer to prevent the characters 65 and the like from being scraped off when the user scrapes off the surface of the card. Each of the two metal foils 67 and 68 is a layer mainly made of aluminum foil and having a thickness of 5 to 10 μm. By scraping off the layers, the user can print characters or the like 65 on the scratch card. You will be able to check.

[0009]

In each of the above-mentioned two conventional examples, the surface concealing material is a metal foil,
Although we are trying to reduce the manufacturing cost of scratch cards (scratch sheets), the metal foil used in this case is generally very thin, so the unique data such as characters and patterns printed on the sheet can be saved. The unevenness is reflected as it is as the unevenness on the surface of the metal foil, and as a result, there is a problem that the user may visually recognize the specific data contents such as printed characters and patterns without scraping off the metal foil.

In the above-mentioned two kinds of conventional examples, a protective layer is provided on the surface of the printing ink, so that the unevenness of the unique data such as characters and patterns due to the printing ink is actually considerably reduced in the metal foil. However, since the unevenness is not completely absorbed even by the protective layer, the unevenness is slightly generated on the surface of the metal foil. For example, when the user takes a method of inclining the scratch card (sheet for use) and holding it over visible light, even a slight irregularity may be visually recognized by the user as significant information.

In order to solve this problem, conventionally, a pattern unrelated to characters or a pattern on the sheet is printed on the surface of the metal foil, or embossing is applied to the surface of the metal foil to make unevenness of the printing ink on the sheet. I tried to prevent it from appearing,
Alternatively, as disclosed in Japanese Patent Laid-Open No. 2000-25374, measures have been taken such that the degree of reflection of unevenness of printing ink on the surface of the metal foil is further reduced by using two metal foils in a stacked manner. It was

However, all of them are measures for making the unevenness on the surface of the metal foil less noticeable, and have not been a means for fundamentally eliminating the unevenness on the surface of the metal foil due to the printing ink on the sheet. Further, Japanese Patent Laid-Open Nos. 63-21082 and 2000-25374 disclose the mount 51,
Since the visible light transmission prevention treatment is not performed on the base material 62, the printing surface 53, and the protective layer 66, characters and patterns printed by transmitting visible light through the scratch card (scratch sheet). Specific data content (display content 5
2, letters, etc. 65) by the user to (metal) foils 54, 67, 6
There is also a problem that it may be visible even if 8 is not scraped off.

Therefore, the object of the present invention is to prevent the unevenness due to the unique data as the recording information printed on the scratch card (scratch sheet) from being reflected on the surface metal foil, in other words, the surface of the metal foil. It can be kept smooth and, moreover, the user can visually recognize the unique data contents such as characters and designs printed by transmitting visible light through the scratch card (scratch sheet) without scraping off the (metal) foil. It is to provide a scratch card that can be prevented and a method for manufacturing the scratch card.

[0014]

According to the present invention, in order to solve the above problems of the conventional scratch card (scratch sheet), a thermoplastic resin is formed on the base material of the scratch card (scratch sheet). An undercoat layer made of a resin is provided, and unique data such as characters and patterns which are recorded information printed on a base material and the undercoat layer are integrated to form one layer (integrated layer).
Since the surface of the integrated layer is smooth, the lower surface and the surface of the metal foil which is the concealing layer provided on the surface of the integrated layer,
There is no unevenness derived from the unique data such as the characters or the designs. In order to form such an integrated layer having a smooth surface, the concealing layer is formed by stamping with a metal foil, and the undercoat layer is formed by roll-forming an opaque thermoplastic resin on a substrate or It shall be formed by injection molding or the like.

Both the intrinsic data and the thermoplastic are
Either may be formed on the base material first, but in any case the thermoplastic resin is softened by heating when the concealing layer is formed on the base material by foil stamping with a metal foil. Are incorporated into the thermoplastic resin to form an integral layer. That is, when the undercoat layer is provided in advance, the unique data is that the thermoplastic resin as the undercoat layer melts when the concealing layer is formed by stamping with the metal foil, so that Unique data penetrates into and both are integrated. Further, when the unique data is formed on the base material first, the thermoplastic resin which is the undercoat layer is melted when the concealing layer is formed by pressing the metal foil after forming the undercoat layer. An integral layer is formed.

When the integral layer formed in this way is equal to or thicker than the thickness of the unique data, the printing ink can be completely buried in the integral layer. The resulting unevenness does not exist on the surface of this integrated layer. By supplying a larger amount (thickness) of the thermoplastic resin forming the undercoat layer compared to the specific data, the formed integrated layer can be made sufficiently thick. In addition, when the undercoat layer is provided first, since an opaque thermoplastic resin can be used, the unique data content such as characters and designs printed by transmitting visible light through the scratch card (scratch sheet) It is possible to provide a scratch card which can be prevented from being visually recognized by the user without scraping off the (metal) foil, and a manufacturing method thereof.

That is, according to the present invention, at least one surface of the base material is printed with unique data as recording information and an undercoat layer is formed, and the unique data as recording information and the undercoat layer are covered. Scratch card with peelable and opaque hiding layer
In the (scratch sheet), the undercoat layer is made of a thermoplastic resin, and forms a layer in which the undercoat layer and the unique data as the recording information are integrated, and is a boundary surface with the hiding layer. In the scratch card, the upper surface of the unique data and the upper surface of the undercoat layer are substantially the same plane.

Further, the present invention is the scratch card, wherein the concealing layer is made of a metal foil formed by foil stamping.

Further, the present invention is the scratch card, wherein the undercoat layer is formed by a method such as roll molding or injection molding.

Further, according to the present invention, an undercoat layer made of a thermoplastic resin is formed on one surface of a base material, and unique data as recording information is printed on or under the surface of the undercoat layer while hiding it. The layer is formed by stamping with a metal foil, and at least a part of the undercoat layer is softened to penetrate the unique data as the recording information into the undercoat layer, and the upper surface of the unique data and the underlayer. This is a method for manufacturing a scratch card in which the upper surface of the coat layer is substantially the same plane.

Further, the present invention is a method for manufacturing a scratch card, wherein the concealing layer is formed by stamping with a metal foil, and the undercoat layer is formed by a method such as roll molding or injection molding. And a scratch card manufacturing method.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION A scratch card according to an embodiment of the present invention and a method for manufacturing the same will be described below with reference to the drawings.

FIG. 1 is a partial sectional view of a scratch card according to the present invention, and FIGS. 2 and 3 are manufacturing process diagrams of the scratch card shown in FIG. 1 by different methods.

In FIG. 1, an integral layer 15 made of a thermoplastic resin 13 and a printing ink 14 is provided on a base material 12 constituting the scratch card 11, and a surface 16 which is an upper surface of the integral layer 15 is formed. Even at a position which is smooth and corresponds to the boundary between the thermoplastic resin 13 and the printing ink 14, no step or unevenness is generated. A metal foil 17, which is a hiding layer, is provided further above the integrated layer. The surface 16 also serves as a boundary surface between the integrated layer 15 and the metal foil 17, and since the surface 16 is smooth, no particular step or unevenness due to the printing ink 14 can be seen on the lower surface and the surface of the metal foil 17. I can't. Therefore, the surface of the scratch card 11 does not have irregularities in the shape related to the content of the printing ink 14.

As the base material of the scratch card, a plastic such as polyethylene terephthalate (PET) resin, polypropylene, polystyrene, polyvinyl chloride or the like and a paper material such as Kent paper or coated paper are generally used. Since the heating process is included in the process,
In particular, a material having heat resistance is required.

As such a material, coated paper or crystallized polyethylene terephthalate (C-PET) is suitable. When the substrate is plastic, it may be colored by containing pigment particles, and some printing may be performed on the substrate as long as it does not cause unevenness or steps in the area of the printing ink. . Further, an integral layer in which the printing ink and the thermoplastic resin are integrated is provided on the substrate, and the same layer has a configuration in which the periphery of the printing ink heated and transferred from the thermal transfer sheet is filled with the thermoplastic resin. Has become.

Although the thermoplastic resin and the printing ink have the same height in FIG. 1, the height of the thermoplastic resin may be higher than that of the printing ink. In that case, the thermoplastic resin partially covers the upper part or the lower part of the printing ink. Here, the material of the thermoplastic resin is
Polyethylene, polystyrene, polypropylene, AS resin, ABS, which is softened at a relatively low temperature due to the process
A resin or the like is suitable, and a layer is formed on the surface of the base material by roll molding, injection molding, or the like. Further, the printing ink is printed on the base material by heat-transferring the ink on the thermal transfer sheet, and has a condition that the melting temperature is higher than that of the thermoplastic resin. If there is a problem with the fixing properties of the thermoplastic resin and printing ink on the substrate,
A thermoplastic resin and a printing ink may be preliminarily provided with a smooth receptive layer having a characteristic exhibiting good fixability. Further, for the purpose of protecting the layers of the thermoplastic resin and the printing ink, a protective layer having no scratch property may be provided so as to cover both.

A metal foil layer is formed by foil stamping above the integral layer constituting the scratch card, and the metal foil has a scratch property. Aluminum foil is suitable as the metal foil, but metal foils other than aluminum, such as gold foil, silver foil, and copper foil, may be used. If necessary, the surface (upper surface) of the metal foil may be colored, characters or patterns may be printed, and the surface may be subjected to satin finish from the viewpoint of decorativeness. By sandwiching a thin layer of adhesive that heats and melts on the back surface (lower surface) of the metal foil, or by forming an adhesive layer on the back surface of the metal foil in advance, the metal foil can be integrated into an integrated layer by heating during foil pressing. Adhesively fixed to the surface. The boundary surface between them (the surface 16 shown in FIG. 1) is smooth, and at least the unevenness and the step due to the surface shape of the printing ink are not reflected at all.

Regarding the method of assembling the scratch sheet shown in FIG. 1 described above, two types of manufacturing methods will be described below with reference to FIGS. 2 and 3, respectively. The biggest difference between the two manufacturing methods is the order in which the printing ink and the thermoplastic resin are respectively formed on the substrate. FIG. 2 is a diagram showing a case where layers are formed on a base material in the order of thermoplastic resin → printing ink, and FIG. 3 is reversely, layers are formed on the base material in the order of printing ink → thermoplastic resin. This is the case.

In FIG. 2, first, a base material 21 is prepared as shown in FIG. The base material 21 is a plate-shaped paper or plastic as described above, but it is necessary to have sufficient thickness and strength because printing ink or a metal foil described later is laminated on the surface thereof, and generally, several tens of μm. ~ Several mm
The thickness is preferably about 100 μm to 1 mm. Further, on the surface thereof, so that the thermoplastic resin and the printing ink described later show sufficient fixing property,
If necessary, the surface may be modified. For example, when the base material 21 is made of Kent paper or the like, by coating the surface of the base material 21 with an organic resin, the surface can be smoothed and the lipophilicity of the surface can be improved.

Next, as shown in FIG. 2B, the base material 21
An undercoat layer 22 is formed on the surface of the. The undercoat layer 22 is formed by thinly laminating a thermoplastic resin layer on the surface of the base material, and as described above, the softening point needs to be lower than that of the base material 21. First, the thermoplastic resin is once heated and melted, and then a layer is formed on the surface of the base material by a method such as roll molding or injection molding. The thickness of the formed undercoat layer 22 is set to be equal to or slightly larger than the thickness (height) of the printing ink described below after printing,
Generally, it is about 1 to 10 μm.

Next, as shown in FIG. 2 (3), printing ink is pressed against the surface of the undercoat layer 22 to penetrate into the undercoat layer. In this step, the thermal transfer sheet having an ink layer on the sheet surface is pressed against the undercoat layer surface, and the ink layer is partially melted in the shape of the printing pattern from the back surface of the sheet by the thermal head to form the ink layer. It is transferred onto the surface of the undercoat layer.

However, since the undercoat layer is partially melted into the shape of the printing pattern by the heat applied by the thermal head, the ink layer melted by the pressure applied to the thermal transfer sheet penetrates into the undercoat layer. To do. As a result, the undercoat layer is transformed into an integral layer 25 made of two kinds of components, that is, the thermoplastic resin 23 and the printing ink 24 to which the ink layer is transferred. In this series of steps, the undercoat layer 22 has almost the same thickness as the integrated layer 25, and the thickness of the undercoat layer is determined so that the printing ink 24 is not thicker than the integrated layer 25. If the thermal coating of the undercoat layer is sufficiently performed by the thermal head, the surface of the integrated layer becomes a smooth surface. In addition, since the thickness of the integrated layer is the same as that of the undercoat layer, it is generally 1 to
It is about 10 μm.

Finally, as shown in FIG. 2 (4), a metal foil 26 which is a scratch layer is formed on the surface of the integrated layer 25 by stamping. The integrated layer and the metal foil do not necessarily stick to each other, but they are not separated from each other by being installed between the two when pressing the foil or by the action of a paste that is previously provided on the back surface of the metal foil 26. . When the user scrapes off the metal foil on the surface of the scratch card, both the metal foil and the glue are scraped off, and it is possible to remove the metal foil without leaving it.

Next, a method of assembling the scratch seat different from that shown in FIG. 2 will be described with reference to FIG. In FIG. 3A, first, the base material 31 is prepared as in the case of FIG. The base material 31 is exactly the same as the base material 21 and is made of plate-shaped paper or plastic, and its thickness is generally several tens μm to several mm, and more preferably 1 μm to several mm.
It is desirable that the thickness is about 00 μm to 1 mm.

Next, as shown in FIG. 3B, the base material 31
Printing ink is pressed against the surface of the to form a layer of printing ink 34. In this process, the thermal transfer sheet with the ink layer on the surface of the sheet is pressed against the surface of the base material, and the thermal head partially melts the ink layer into the shape of the print pattern and transfers the ink onto the surface of the base material. The layer of the ink 34 is formed. The thickness (height) of the layer of the printing ink 34 is the same as or slightly lower than that of the integrated layer 35 described later, as in the case of the embodiment whose manufacturing process is shown in FIG.

Next, as shown in FIG. 3C, the base material 31
A layer of thermoplastic resin 33 is thinly laminated on the surface of the base material and is integrated with the printing ink 34 to form an integrated layer 35. However, the printing ink 34 is already layered on the surface of the substrate 31. Therefore, in the layer forming step of the integrated layer, first, the thermoplastic resin is once heated and melted, and a layer is formed on the surface of the base material 31 by a method such as roll molding or injection molding so as to cover the layer of the printing ink 34. It will be. In this case, the softening point of the thermoplastic resin 33 must be lower than that of the base material 31 so that the thermoplastic resin does not deform the base material 31 and the layer of the already formed printing ink 34. It is more desirable that the temperature is lower than that of the ink 34.

The thermoplastic resin 33 layered on the surface of the substrate 31 wraps around the printing ink 34 due to its fluidity when the layer is formed, and fills the voids to wrap the printing ink 34. As a result, they unify to form an integral layer 35. Since the amount of the thermoplastic resin 33 to be layered is determined so that the formed integrated layer 35 does not become thinner than the printing ink 34, the heat of the thermoplastic resin 33 during the layer formation is determined. If the melting is sufficiently performed, the surface of the integral layer 35 becomes a smooth surface. Further, the thickness of the formed integral layer 35 is set to be equal to or slightly thicker than the printing thickness (height) of the above-described printing ink 34, and is generally about 1 to 10 μm.

Finally, as shown in FIG. 3 (4), a metal foil 36, which is a scratch layer, is formed on the surface of the integrated layer 35 by stamping. This step is the same as the step shown in FIG. The foil stamping is performed by installing between the integrated layer 35 and the metal foil 36, or by adhering the two by the action of a paste provided in advance on the back surface of the metal foil 36. When the user scrapes off the metal foil on the surface of the scratch card, both the metal foil and the glue are scraped off, and it is possible to remove the metal foil without leaving it.

As described above, in the scratch cards produced in the above examples, the metal foil covering the surface of the sheet does not reflect the unevenness derived from the printed content. Therefore, it is completely impossible for the user to visually recognize the printed content from the irregularities on the surface of the scratch card, and it can be said that the scratch card has excellent performance in comparison with the concealability of the print information required by the scratch card.

[0041]

As described above, in the scratch card of the present invention, the printing information formed between the base material and the metal foil as the concealing layer is formed by thermal transfer printing, and the printing ink constituting the printing information is formed. By filling the surrounding area with a thermoplastic resin, the printing ink is embedded in the layer containing the thermoplastic resin. For this reason, the unevenness derived from the printing ink does not appear as the unevenness on the surface of the metal foil, and thus the printing concealed based on the unevenness on the surface of the metal foil without the user scraping off the metal foil. It is completely impossible to see the information. From this, it can be said that the scratch card according to the present invention has high performance that could not be realized in the past in terms of the concealability of print information required for the scratch card.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view of a scratch card that is an example of a scratch sheet according to the present invention.

FIG. 2 is a manufacturing process diagram in the embodiment of the scratch card shown in FIG. (1)-(4) is a figure which shows each step of a manufacturing process in order, and each figure is a partial sectional view of the scratch card in process, respectively.

FIG. 3 is a manufacturing process diagram different from that of FIG. 2 in the embodiment of the scratch card shown in FIG. (1)-(4) is a figure which shows each step of a manufacturing process in order, and each figure is a partial sectional view of the scratch card in process, respectively.

FIG. 4 is an explanatory view of a conventional example of a printed material (scratch sheet) described in Japanese Utility Model Publication No. 44-12094. Figure 4
4A is a cross-sectional view of an example of a printed material, and FIG. 4B is a cross-sectional view showing a case where a part of the surface is scraped off.

FIG. 5 is an explanatory diagram of a conventional manufacturing process of a scratch sheet according to Japanese Patent Laid-Open No. 63-21082. 5 (1)-
(4) is a flowchart showing a manufacturing process of a scratch sheet of a conventional example in order.

FIG. 6 is a perspective view of a main part of a scratch card, which is a conventional example of a scratch sheet disclosed in Japanese Patent Laid-Open No. 2000-25734.

[Explanation of symbols]

11 scratch cards 12 Base material 13 Thermoplastic resin 14 printing ink 15 integrated layers 16 surface 17 Metal foil 21 Base material 22 Undercoat layer 23 Thermoplastic resin 24 printing ink 25 integrated layers 26 Metal foil 31 Base material 33 Thermoplastic resin 34 printing ink 35 one layer 36 metal foil 41 paper 42,44 print image 43 Medium layer 51 mount 52 Display contents 53 Print side 54 foil 61 scratch cards 62 Base material 63 ink receiving layer 64 recording surface 65 characters, etc. 66 Protective layer 67,68 Metal foil

Claims (6)

[Claims] 1. An undercoat layer is formed on at least one surface of a base material, and an undercoat layer is formed on the base material. A peelable and opaque hiding layer is formed over the unique data and the undercoat layer. In the scratch card, the undercoat layer is made of a thermoplastic resin, forms a layer in which the undercoat layer and the unique data are integrated, is a boundary surface with the hiding layer, the upper surface of the unique data and the A scratch card in which the upper surface of the undercoat layer is substantially the same plane. 2. The scratch card according to claim 1, wherein the concealing layer is formed by stamping with a metal foil. 3. The scratch card according to claim 1 or 2, wherein the undercoat layer is formed by roll molding, injection molding or the like. 4. A method for manufacturing a scratch card, comprising printing unique data on at least one surface of a base material, forming an undercoat layer, and forming a peelable and opaque hiding layer covering the unique data and the undercoat layer. , The undercoat layer is a thermoplastic resin, the undercoat layer and the unique data is formed as a layer that is integrated, the upper surface of the unique data and the upper surface of the undercoat layer, which is a boundary surface with the hiding layer, A method of manufacturing a scratch card, which is characterized in that the surfaces are substantially the same. 5. The scratch card manufacturing method according to claim 4, wherein the concealing layer is formed by stamping with a metal foil. 6. The scratch card manufacturing method according to claim 4 or 5, wherein the undercoat layer is formed by a method such as roll molding or injection molding.