JP2003159889A - Scratch card - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a low-cost scratch card capable of keeping confidentiality completely. <P>SOLUTION: This scratch card is structured of a heat-sensitive and scratch- releasable concealed layer and a surface layer sequentially formed on a base material. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
The present invention relates to a scratch card that is confirmed by scratching a hiding layer, and more particularly to a scratch card that can write hiding information after the scratch card is completed.

[0002]

2. Description of the Related Art A scratch card having a concealment layer having a property of being peeled off and removed by rubbing with a coin or the like on a surface on which information is recorded by a method such as printing on a support such as paper or film is known. For example, it is widely used as a data card for encoding into a computer, for playing a bingo game, rock-paper-scissors, etc., or for checking a parking place in a parking lot and a questionnaire card.

In such a scratch card, usually, information to be hidden on the surface of a base material is printed in advance by offset printing or the like, and then a scratchable hiding layer for hiding a part of the information is provided. Further, the usage of the card itself and the meaning of the information that appears by scratching may be pre-printed before the hiding layer is provided, or may be printed after the hiding layer is provided, but the number of times of printing is reduced, In order to reduce the manufacturing cost of cards, usually after the first printing,
The scratch releasable hiding layer is provided only on the part to be hidden. Therefore, in this case, there is a drawback that the confidentiality cannot be maintained in the manufacturing process.

[0004]

Therefore, as a result of earnest studies on an inexpensive scratch card capable of maintaining confidentiality in the manufacturing process, the present inventor found a method for recording concealment information after manufacturing the scratch card. Reached Therefore, an object of the present invention is to provide an inexpensive scratch card capable of completely maintaining confidentiality.

[0005]

The above objects of the present invention are as follows.
This is achieved by a scratch card, which comprises a heat-sensitive recording layer, a scratch-releasing concealing layer, and a surface layer, which are sequentially provided on one surface of a substrate. The thickness of the surface layer is preferably 10 μm or less in order to make the color development of the heat sensitive layer clear, and the opaque ink is provided on the back surface of the scratch card so that the hidden information cannot be seen from the back surface of the base material. It is preferable to form a pattern according to.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The scratch card of the present invention has a heat-sensitive recording layer, a scratch releasable concealing layer, and a surface layer in that order on one surface of a substrate. The above-mentioned substrate can be appropriately selected from known ones, and specific examples thereof include
For example, high-quality paper, paper such as coated paper, polyethylene terephthalate, polyester film such as polyethylene terephthalate / isophthalate copolymer, polyethylene,
Polyolefin film such as polypropylene and polymethylpentene, polyvinyl chloride film, ethylene vinyl alcohol copolymer film, polycarbonate film, plastic film such as polyamide film,
Examples include paper, polyolefin, and synthetic paper made of polyethylene.

The heat-sensitive recording layer of the present invention may be a heat-sensitive color-forming ink, a heat-coloring type such as used in a facsimile or a printer, or a heat-decoloring type. It can be appropriately selected and used from known ones. If a multicolor heat-sensitive material is used, the concealment information can be recorded in multiple colors. Further, a substrate provided with a thermosensitive recording layer is commercially available as a thermosensitive coloring paper or a thermosensitive coloring sheet, and these can also be used in the present invention.

The scratch releasable hiding layer in the present invention contains a binder and a hiding agent. Examples of the binder include known adhesives and pressure-sensitive adhesives such as acrylic resins, vinyl acetate resins, ethylene / vinyl acetate resins, rubber resins and urethane resins. Further, as the masking agent, aluminum powder, metal powder such as copper powder, titanium oxide, iron oxide,
Examples thereof include inorganic pigments such as zinc oxide, talc and clay, inorganic fillers, organic pigments such as carbon black and phthalocyanine blue. In addition, in order to adjust the peeling force, wax, silicone resin or the like may be appropriately added.

The ratio of binder to masking agent is 9: 1 by weight.
˜2: 8 is preferable, and 6: 4 to 3: 7 is particularly preferable. If the proportion of the binder exceeds 9, it becomes difficult to obtain sufficient hiding power, and if it is less than 2, the adhesion to the heat-sensitive recording layer may be insufficient. The thickness of the scratch releasable masking layer is preferably 1 to 50 μm,
It is particularly preferably 10 to 40 μm. If it is thinner than 1 μm, it is difficult to obtain the concealing property, and if it is thicker than 50 μm, the scratch property becomes poor.

The peeling force between the scratch releasable concealing layer and the heat-sensitive recording layer is preferably 9.8 to 980 mN / 25 mm, particularly preferably 50 to 300 mN / 25 mm. If the peeling force is less than 9.8 mN / 25 mm, it is easy to peel off and may peel off carelessly due to friction.
If it is larger than 980 mN / 25 mm, peeling becomes difficult.
In addition, in order to adjust the peeling force, wax, silicone resin or the like may be appropriately added. Further, in the present invention, the peeling force is measured by the following method. A cellophane adhesive tape is attached on the surface layer of the scratch card of the present invention, and the adhesive tape is peeled off by a 180 ° peeling method according to JIS K 0237, and the peeling force is measured.

The scratch card of the present invention is preferably provided with a printing layer on the back surface of the substrate, that is, on the surface opposite to the heat-sensitive recording layer. The printing layer can prevent the information to be hidden after heat-sensitive recording with a printer or the like from being transferred to the back surface. The ink color is preferably a dark color such as black or blue, and the printed area is preferably 30% or more of the area to be hidden. In addition, the heat-sensitive recording layer and the scratch releasability concealment masking so that the sensitivity does not decrease over time due to the influence of the drug or the residual solvent in the concealing layer and the recorded information disappears. An intermediate layer for protecting the heat-sensitive recording layer can be appropriately provided between the layers.

The surface layer in the present invention is preferably white or light colored so that the surface can be printed. The surface layer is formed of a known white ink or white paint comprising a binder similar to that used in the scratch releasable masking layer and a white pigment such as titanium oxide, zinc oxide or calcium carbonate. In the present invention, it is particularly preferable to use an ultraviolet curable ink in terms of manufacturing work. The thickness of the surface layer is preferably 10 μm or less, and 1 to 8 μm.
Is more preferable. If it exceeds 10 μm, the sharpness of color development in the heat-sensitive recording layer tends to be insufficient.

In the production of the scratch card of the present invention, first, one surface of the substrate is coated with the coating material for the heat-sensitive recording layer by a coater such as a roll knife coater, a gravure coater, an air knife coater, or a knife coater. Prepare commercially available thermal recording paper. On the other hand, separately, a coating liquid containing a binder, a masking agent and, if necessary, a solvent is applied to the release surface of a release sheet obtained by release-treating one side of a substrate such as a polyethylene terephthalate film or paper with a silicone resin with the coater or the like. Forming a scratch releasable masking layer by drying, and laminating the opposite surface (exposed surface) of the scratch releasable masking layer on which the release sheet is provided and the thermosensitive recording layer provided on the substrate, or Laminate the thermal recording paper. Next, the release sheet on the scratch releasable masking layer is peeled off, and white ink or the like is printed on the surface by offset printing, screen printing or the like to form a surface layer. Further, if necessary, a printing layer is formed on the back surface of the substrate (the surface without the thermosensitive recording layer) by the printing. Incidentally, after forming the scratch releasable masking layer on the release surface of the release sheet, once the release surface of another release sheet and the surface of the exposed scratch releasable masking layer are pasted, wound into a roll, and separated. Peel off this release sheet in the process of
The heat-sensitive recording layer and the scratch releasable concealing layer may be bonded together.

[0014]

Since the scratch card of the present invention records the hidden information after the card is manufactured, the confidentiality is not lost in the manufacturing process unlike the conventional case. Further, since the above-mentioned recording is performed thermally, the manufacturing cost does not increase due to the repeated printing.

[0015]

EXAMPLES The present invention will be described in more detail below with reference to examples, but the present invention is not limited thereto. Example 1. Release sheet (manufactured by Lintec Co., Ltd., product name S
P-8KFX), using a roll knife coater on the release surface side, an acrylic adhesive (manufactured by Lintec Co., Ltd., M-
7) and aluminum powder (Asahi Kasei Co., Ltd., Altop 15T) in a weight ratio of 40:60 and a thickness of 30 μ
m scratch releasable masking layer was formed. Next, on the scratch releasable concealment layer, a thermal recording paper (manufactured by Ricoh Co., Ltd.,
It was attached to a heat-sensitive recording surface of Ricoh thermal paper (peeling force: 117 mN / 25 mm). Then, the release sheet was peeled off, and the UV curable white ink (manufactured by T & K Co., TOK, TOK
A BEJTCURE UV161 white S) was used for printing on an offset printing machine, and ultraviolet rays were applied to provide a surface layer (thickness 2 μm). On the non-thermosensitive recording layer side of the thermal recording paper,
Black ink (manufactured by T & K, TOKA BEJTCUR)
EUV161 ink S) is used for printing with an offset printing machine, and ultraviolet rays are irradiated to provide a printing layer (printing area 50
%), To obtain a scratch card of the present invention. Concealment information was printed on the thermal recording layer from the surface layer side of this card using a thermal printer. It was confirmed that the hidden information could not be known from the back surface of the obtained scratch card. When the hiding layer was scraped off with a coin, the recorded contents could be confirmed. This result demonstrates the effectiveness of the present invention.

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Claims (3)

[Claims] 1. A scratch card comprising a heat-sensitive recording layer, a scratch-releasing concealing layer, and a surface layer, which are sequentially formed on one surface of a substrate. 2. The scratch card according to claim 1, wherein the surface layer has a thickness of 10 μm or less. 3. The scratch card according to claim 1, wherein a pattern is printed on the other surface of the base material with an opaque ink.