JPH03147516A - Magnetic layer concealment card and its manufacturing method - Google Patents

Abstract

PURPOSE:To obtain the magnetic layer-concealed card having the better concealability by using granular aluminum powder of a specific grain size for the silver color ink of a concealing layer. CONSTITUTION:The magnetic layer 11 is partially embedded in the surface of a card body 10 and the surface of the card body 10 is formed nearly flush with the surface of the magnetic layer 11. The concealing layer 12 consisting of the silver color ink layer 4' made of the granular aluminum powder 5 is provided thereon and a design layer 13 of free designs and free tints is printed thereon. The silver color ink formed by dispersing the granular aluminum powder having 7mum average grain size into a binder resin is used in this case. The ratio of the granular aluminum powder in the silver color concealing layer is preferably in a 5 to 30wt.% range. Thus, the perfect concealing of the magnetic layer 11 is possible without being affected by the microspacings 3 between the magnetic layer 11 and an over sheet 1 and the microsteps of the magnetic layer 11 and the over sheet 1.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention hides the color of the magnetic layer of a magnetic recording medium used for bank cards, bankbooks, commuter passes, etc., and makes it possible to create a free design on the entire surface. The present invention relates to a magnetic layer concealment card and a manufacturing method thereof.

[Conventional technology]

This type of card usually has a pattern printed on the surface of a core sheet made of opaque synthetic resin such as polyvinyl chloride.
Furthermore, an oversheet made of synthetic resin such as polyvinyl chloride is coated, and a magnetic layer is partially applied to this oversheet.
It is set up in Therefore, in this type of conventional magnetic card, the pattern provided on the core sheet is partially hidden by the magnetic layer (usually brown in color) provided thereon, which is not desirable in terms of appearance.

Furthermore, when a magnetic layer is partially provided, a card is known in which the background part of the magnetic layer is made in the same color tone as the magnetic layer in order to make the magnetic layer less noticeable (Japanese Patent Publication No. 61
-5203). However, even with this method, the magnetic layer cannot be completely hidden (the concealment is not sufficient).Furthermore, in order to hide the magnetic layer, a colored transfer foil is transferred onto the magnetic layer, and this is transferred to the base material. There is also a known method for embedding the image so that it is flush with the image (Japanese Patent Publication No. 1-25145).However,
This method has the problem of requiring many *M steps and increasing costs. Furthermore, a method of providing a vapor deposited layer on top of the magnetic layer so as to hide it is also known (Utility Model Application No. 58-39739).
No. 64-11777). However, since the vapor deposited layer is conductive, it is easily charged with static electricity, and there is a high risk of destroying the writer who writes information on the magnetic layer and the reader who reads information from it, and the vapor deposition layer and its protective layer may be scratched. There are problems in that the vapor-deposited layer easily rusts due to sweat.

Therefore, in conventional cards having a partial magnetic layer, the magnetic layer was hidden by a layer of silver ink.

The silver ink is made by dispersing flat aluminum powder in a suitable binder resin 2 solvent. When this is applied onto the magnetic layer and the surface is hot pressed, the flat aluminum powder becomes parallel to the card surface. The magnetic layer is aligned, and the surface has a metallic luster that hides the magnetic layer. Since designs can be freely printed on this silver ink layer, the design of the card becomes more flexible and its value increases.

[Problem to be solved by the invention]

However, even if such a silver ink layer is actually provided on the magnetic layer to cover it up, the magnetic layer will still stand out from the surface. In order to prevent this conspicuousness, the thickness of the silver ink layer can be increased, but in order to write information on the magnetic layer and read it, the thickness of the layer on top of the magnetic layer must be less than about 10 μm. Therefore, the thickness of the silver ink layer cannot be made greater than this.

Therefore, as a result of various studies to solve the above problems, we found that if granular fine powder was used instead of the usual flat aluminum powder, the magnetic layer would not be noticeable and could be completely removed. The present invention was completed by discovering that this can be hidden.

That is, an object of the present invention is to solve the problems of the above-mentioned prior art magnetic layer concealing cards using silver ink and to provide a magnetic layer concealing card with better concealing properties and a method for manufacturing the same.

[Means to solve the problem]

Therefore, we investigated the reason why the conventional silver ink layer is inferior in hiding performance.

As shown in FIG. 3, when the magnetic layer 2 is pushed into the oversheet 1, minute gaps 3 are generated on the sides of the magnetic layer 2.

Further, the surface of the magnetic layer 2 and the surface of the oversheet 1 are not completely flush with each other.

When a silver ink layer 4 made of flat aluminum powder is applied to the surface of such an object and a press is applied to make it glossy,
The flat aluminum powder 5 of the ink on the uniform area is aligned parallel to the surface and produces a metallic luster, but the ink near the boundary between the magnetic layer 2 and the oversheet 1 flows and the flat aluminum powder 5 is not necessarily aligned parallel to the surface. Do not align parallel to . Therefore, when viewed from the surface, the gloss near the boundary is different from other parts. Therefore, the outline of the magnetic layer 2 becomes conspicuous.

This is the first reason for the supposed poor concealability.

Furthermore, when light enters in the direction shown in FIG. 3, the light is not hidden by the flat aluminum powder 5 and the magnetic layer 2
reach. The reflected light goes out without being scattered in any way. Even when the reflected light hits the aluminum powder, the direction of reflection is approximately constant, so that a portion of the magnetic layer 2 can be seen from this direction of reflection. Since the color of the magnetic layer 2 is different from the color of the oversheet 1, the magnetic layer 2 stands out. This is the second probable reason.

Thus, it can be seen that the problem with the conventional concealing layer consisting of a silver ink layer arises from the use of flat aluminum powder to produce metallic luster.

Therefore, the inventors of the present invention have discovered that by using granular aluminum powder instead of flat aluminum powder, such a magnetic layer becomes less noticeable and can be completely hidden. That is,
As shown in FIG. 2, in the case of a silver ink layer 4' made of granular aluminum powder 5', even if the ink near the boundary between the magnetic layer 2 and the oversheet 1 flows, the granular aluminum powder 5' in the vicinity
is not oriented differently from aluminum powder in other areas.

Therefore, the same problem as the first reason above does not occur. Furthermore, since the light incident on the area of the magnetic layer 2 and the light reflected from the magnetic layer 2 are diffusely reflected by the granular aluminum powder 5', the reflected light from the magnetic layer 2 is not directed in a fixed direction but is averaged. Therefore, it does not mean that the magnetic layer 2 is visible. Therefore, cervix as mentioned in the second reason does not occur.

The above is the principle of the present invention. Therefore, the magnetic layer concealing card of the present invention is a card in which a concealing layer made of silver ink is provided on at least a part of the magnetic layer provided on at least one side of the guard, in which the silver ink has an average particle size of 7 μm.
It is characterized in that it is formed by dispersing aluminum powder in the form of particles of less than m in size in a binder resin.

The proportion of granular aluminum powder in the silver concealment is 5 to 33wt.
% range.

Note that it is usual to provide one or both of a colored layer and a pattern layer on the hiding layer.

Furthermore, electronic components such as a memory and an IC may be embedded inside the card.

In addition, as a manufacturing method for such a magnetic layer concealment card, an oversheet to which a magnetic layer is thermally transferred, one or two core sheets, and another oversheet or an oversheet to which a magnetic layer is thermally transferred are prepared in this order. After stacking and heat-pressing to integrate, the above-mentioned silver ink layer is printed on the surface having the magnetic layer, and a pattern printing layer and a protective layer are sequentially provided on the surface, and a magnetic layer of an oversheet with the magnetic layer thermally transferred. The above-mentioned silver ink layer is printed on a surface having A method in which a release layer, a protective layer, a pattern printing layer, and a hiding layer made of the above-mentioned silver ink are formed in this order on a heat-resistant film, and this laminate and an oversheet to which a magnetic layer is thermally transferred are formed. A typical method is to stack one or two core sheets and another oversheet in this order and heat press them to integrate them, and then peel off the heat-resistant film 1. In the case of the method using this heat-resistant film, it is preferable to further form a heat-sensitive adhesive layer on the hiding layer made of the silver ink and then integrate the layers by hot pressing. Furthermore, in each of the above methods, a colored layer may be provided between the silver ink layer printing layer and the pattern printing layer.

[Effect]

Even if the ink near the boundary between the magnetic layer and the oversheet flows, the granular aluminum powder in the vicinity will not be oriented differently from the aluminum powder in other areas, so the gloss and luster in the vicinity of the boundary will be different from other areas. There is no difference, and since the light incident on the area of the magnetic layer and the light reflected from the magnetic layer are diffusely reflected by the granular aluminum powder, the reflected light from the magnetic layer is not directed in a fixed direction but is averaged. Therefore, it does not mean that the magnetic layer is visible. If the average particle diameter of the granular aluminum powder in the silver ink is larger than 7 μm, the hiding property will not be sufficient.

〔Example〕

FIG. 1 shows a cross section of a basic form of a magnetic layer concealment card according to the present invention, in which a magnetic layer 11 is partially embedded in the surface of a card body 10, and the surface of the card body 10 and the surface of the magnetic layer 11 are partially embedded. It is almost on the same plane. A concealing layer 12 made of a silver ink layer made of granular aluminum powder of the present invention is provided on top of this, and a pattern layer 13 with a free pattern and a free color tone is printed thereon. This hiding layer 12 makes the magnetic layer 11 completely invisible. Note that a colored layer may be provided between the hiding layer 12 and the pattern layer 13 if necessary.

To give a specific example and a conventional comparative example, as the card body 10, a polyvinyl chloride oversheet with a thickness of 100 μm and a polyvinyl chloride (white) core sheet with a thickness of 280 μm and a polyvinyl chloride (white) with a magnetic layer 11 thermally transferred into a tape shape. ) A core sheet with a thickness of 280 μm and a polyvinyl chloride (transparent) oversheet with a thickness of 100 μm were stacked in this order and pressed on a hot plate at 150° C. for 10 minutes. Then, on the surface of this oversheet and the surface of the magnetic layer 11, a concealing ink having the composition shown below is printed by silk screen printing to form the concealing layer 12, and a white pattern layer 13 is provided thereon by silk screen printing. After hot pressing for 5 minutes, the hiding property was visually evaluated.

Polyvinyl chloride resin (binder resin) 36 wt parts Aluminum powder shown in the table below: 4 wt parts Solvent: 60 wt parts As can be seen from the evaluation of hiding properties in the above specific examples and comparative examples, the average particle diameter of the granular aluminum powder is 7 μm. The following are valid: When such aluminum powder is used, not only is it good in concealment (no difference in color development), but the surface is smooth and there is no difference in color.

Incidentally, granular aluminum powder can be easily produced by, for example, spraying heated and molten aluminum. By the way, conventional flat aluminum powder is manufactured by crushing aluminum solids into fine particles using a mortar.

In order to turn such aluminum powder into ink, a known method may be used. An ink may be made from powdered aluminum powder, or an ink may be made from a paste. In that case, it is better to include more aluminum powder in the binder resin for better concealment, but the adhesion will be lower and it will fall off easily, so it is better to have the aluminum powder ratio in the range of 5 to 30 wt%. A range of 5 to 15 wt% is suitable. Note that a dispersant such as a surfactant may be added to promote dispersion of the aluminum powder.

The hiding layer 12 can be provided by laminating such silver ink by gravure printing, silk screen printing, knife coating, pan coating, or the like.

Although thicker is better, the thickness of the layer above the magnetic layer determines the minimum gap between the write/read head and the magnetic layer 11 in order to be able to record and read information on the magnetic layer 11. is preferably 5 to 7 μm or less, and since there are other layers such as the pattern layer 13, the thickness of the concealing layer 12 is preferably 2 to 5 μm.

Further, the pattern layer 13 can be freely formed by any known method such as letterpress printing, offset printing, gravure printing, flexographic printing, and silk screen printing. On the outermost surface, for protection,
02 layer (overprint layer: protective layer) may be provided. Note that a colored layer may be provided between the hiding layer 12 and the pattern layer 13 if necessary.

Another manufacturing method is shown in FIG. In this method, the magnetic layer 11
After providing the concealing layer 12 and the pattern layer 13.0PFil15 in this order on the oversheet 14 into which the This is a method of arranging the sheets 17 and pressing the whole sheet into one piece. Since the thin oversheet 14 is processed by printing or the like, it is easy to work and cards can be manufactured at low cost. Also, since the printing surface is also pressed, it is smoother and more glossy than if it were left unprinted.

In addition, the method shown in FIG. 5 is to print a release layer 19, a layer 15, a pattern layer 13, a concealing layer 12, and a heat-sensitive adhesive layer 20 in this order on the heat-resistant film 18 side to make a transfer film, and then apply this to the magnetic layer. 11 is placed on the pressed oversheet 14, and this is placed on one or two core sheets 16 in the same manner as in the case of FIG. 4, and another oversheet is placed below it.
17, heat press and then heat resistant film 18
In this method, the pattern layer 13, concealing layer 12, etc. are transferred. As the heat-resistant film 18, polyethylene terephthalate, polybutylene terephthalate, polyamide (
It is sufficient to use a material having a thickness of 12 to 200 μm such as nylon) or polycarbonate, which has better workability than printing on a normal polyvinyl chloride oversheet, and can be easily processed into a roll. Note that in this example, the heat-sensitive adhesive layer 20 is not necessarily required.

In addition, in the method shown in FIGS. 4 and 5, oversheets 14 and 17 were placed above and below one or two core sheets 16 to form a card body with a thickness of 0.76 mm. ．． Magnetic layer 1 on one support with a thickness of 76 mrn
1 on at least a part of the magnetic layer 11, a concealing layer 12 and a pattern layer 13 may be provided on the surface having the magnetic layer 11. Also in the methods shown in FIGS. 4 and 5, a colored layer may be provided between the pattern layer 13 and the concealing layer 120, if necessary.

Alternatively, the oversheet, core sheet, 0.76 mm thick support, etc. may be colored in the same color tone as the magnetic layer 11 to make the magnetic layer 11 less noticeable.

It goes without saying that electronic components such as a memory and ■C may be embedded in the card.

〔Effect of the invention〕

According to the magnetic layer concealment card and the manufacturing method thereof of the present invention,
By using granular aluminum powder in the silver ink of the concealing layer, even at a thickness that allows information to be written to and read from the magnetic layer, it is possible to eliminate minute gaps between the magnetic layer and the oversheet, as well as between the magnetic layer and the oversheet. The magnetic layer can be completely hidden without being affected by minute differences in height. Further, even if the oversheet and the magnetic layer are flush with each other, there is a slight difference in level, but there is an advantage that this difference in level can be significantly improved.

[Brief explanation of the drawing]

Figure 1 is a sectional view of the basic form of the magnetic layer concealment card based on the present invention, Figure 2 is a diagram for explaining the concealment principle of the present invention, and Figure 3 is a concealment defect of the conventional one using flat aluminum powder. FIG. 4 is a diagram for explaining the manufacturing method of the magnetic layer dark shielding card of the present invention, and FIG. 5 is a diagram for explaining another manufacturing method. 1-Oversheet, 2-Magnetic layer, 3-Minute gap, 4
- silver ink layer made of flat aluminum powder, 5 - silver ink layer made of flat aluminum powder, 4' - silver ink layer made of granular aluminum powder, 5
'-granular aluminum powder, 10-card body, 11-magnetic layer,
12-hidden layer, 13-picture layer, 14-oversheet,
15-OP layer, 16--core sheet, 17-oversheet, 18-heat-resistant film, 19-peel layer, 20-thermal adhesive layer Applicant: Dai Nippon Printing Co., Ltd.

Claims (9)

[Claims] (1) In a card in which a concealing layer made of silver ink is provided on at least a portion of the magnetic layer provided on at least one side of the card, the silver ink contains granular aluminum powder with an average particle size of 7 μm or less in a binder resin. 1. A magnetic layer concealing card characterized in that the magnetic layer is dispersed in the magnetic layer. (2) The ratio of granular aluminum powder in the silver hiding layer is 5 to 30
The magnetic layer concealment card according to claim 1, characterized in that the magnetic layer concealment card is in the range of wt%. (3) The magnetic layer concealing card according to claim 1 or 2, wherein one or both of a colored layer and a pattern layer are provided on the concealing layer. (4) The magnetic layer concealment card according to any one of claims 1 to 3, wherein electronic components such as a memory and an IC are embedded inside the card. (5) A concealing layer made of silver ink prepared by dispersing granular aluminum powder with an average particle size of 7 μm or less in a binder resin is provided on at least a portion of the magnetic layer provided on at least one side of the card. In a method for manufacturing a magnetic layer concealment card, an oversheet with a magnetic layer thermally transferred thereto, one or two core sheets, and another oversheet or an oversheet with a magnetic layer thermally transferred are stacked in this order and heat pressed. 1. A method for manufacturing a magnetic layer concealing card, which comprises printing the silver ink layer on the surface having the magnetic layer, and then providing a pattern printing layer and a protective layer in this order. (6) A concealing layer made of silver ink prepared by dispersing granular aluminum powder with an average particle size of 7 μm or less in a binder resin is provided on at least a portion of the magnetic layer provided on at least one side of the card. In the method for manufacturing a magnetic layer concealment card, the above-mentioned silver ink layer is printed on the surface having the magnetic layer of an oversheet onto which the magnetic layer has been thermally transferred, and a pattern printing layer and a protective layer are sequentially provided thereon, and this laminate and A method for producing a magnetic layer concealing card, which comprises stacking one or two core sheets and another oversheet in this order and heat-pressing them to integrate them. (7) A concealing layer made of silver ink prepared by dispersing granular aluminum powder with an average particle size of 7 μm or less in a binder resin is provided on at least a portion of the magnetic layer provided on at least one side of the card. In the method for producing a magnetic layer concealing card, a release layer, a protective layer, a pattern printing layer, and a concealing layer made of the above-mentioned silver ink are formed on a heat-resistant film in this order, and this laminate, an oversheet on which a magnetic layer is thermally transferred, 1 or 2
1. A method for manufacturing a magnetic layer concealing card, which comprises stacking one core sheet and another oversheet in this order and heat-pressing them to integrate them, and then peeling off the heat-resistant film. (8) A heat-sensitive adhesive layer is further formed on the hiding layer made of the silver ink, and this laminate is combined with an oversheet to which the magnetic layer is thermally transferred, one or two core sheets, and another oversheet. 8. The method of manufacturing a magnetic layer concealing card according to claim 7, wherein the magnetic layer concealing card is formed by stacking the cards in this order and heat-pressing them to integrate them, and then peeling off the heat-resistant film. (9) The method for manufacturing a magnetic layer concealing card according to any one of claims 5 to 8, characterized in that a colored layer is provided between the silver ink layer printing layer and the pattern printing layer.