JP5396919B2 - Card manufacturing method - Google Patents

Description

  The present invention relates to a card manufacturing method for holding information by mounting a magnetic tape or IC module on a card substrate.

  Conventionally, credit cards, ID cards, cash cards, etc., are often used in which non-visual information is written and mounted on a magnetic tape or IC module. Various specifications are available depending on the information recording capacity and security level. Cards have been developed.

  On the other hand, it is indispensable for the user to use the card with various specifications to accurately express visual information such as patterns and characters without any defects. These layers holding visual information are printed pattern forming bodies, and in the process of manufacturing the card, they are laminated together with a carrier that holds non-visual information such as the magnetic tape or IC module, or laminated by injection molding. Are integrated to produce a card (see Patent Document 1).

  When the card manufacturing method includes a laminating process with heating, there are the following problems. The card is generally composed of an oversheet containing a non-visual information carrier such as a magnetic tape on one side or both sides of a card base (core sheet) made of a synthetic resin material, an overprint layer containing a pattern printing layer, and an outermost surface. In many cases, an overcoat layer for protection is laminated. The temperature at which the final overcoat layer is thermally laminated is the highest temperature during the lamination process in card production. During the thermal laminating process, bubbles may be generated between the overcoat layer and the overprint layer including the pattern print layer, and the overcoat layer may be peeled off or the pattern print layer in the overprint layer may crack. is there.

JP-A-10-6671

  The present invention is proposed in view of the above-described problems, and the problem to be solved by the present invention is to laminate a layer in which a pattern or characters are printed on a card substrate and an overcoat layer. By providing a manufacturing method that does not cause a problem that bubbles are generated under the overcoat layer and the overcoat layer is cracked or peeled off, or the pattern printed layer is cracked. is there.

  As a means for solving the above-mentioned problems, the invention according to claim 1 is a card manufacturing method including a step of transferring and laminating an overcoat layer to a card substrate provided with a printing layer, A step of providing a printing layer on the base material using an ink containing a mixed solvent of a main solvent having a boiling point equal to or lower than the laminating temperature and a sub-solvent having a boiling point higher than the laminating temperature, on the printing layer of the card base material A method for producing a card, comprising: a step of transferring an overcoat layer to the substrate; and a step of laminating a card substrate provided with a printing layer and an overcoat layer.

  According to claim 1, a solvent having a different boiling point is mixed with the solvent of the ink used for the printing layer, and the amount of solvent volatilization at the laminating temperature in the laminating step with the overcoat layer can be adjusted. It is possible to provide a production method in which bubbles are generated under the overcoat layer, and the overcoat layer is cracked or peeled off, or a defect in which the picture printed layer is cracked does not occur.

Schematic sectional view for explaining an example of a card manufactured according to the present invention Schematic cross-sectional view for explaining an example of defects occurring in a conventional card Process drawing for demonstrating an example of the process of this invention

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a schematic cross-sectional view for explaining an example of a card manufactured according to the present invention. A so-called overprint (hidden printing) in which a screen printing layer 4 including a print of a pattern and characters and an offset printing layer 5 are superimposed on a laminated base of a magnetic card in which a magnetic tape 3 is embedded on a base 1 through an oversheet 2. ), And an overcoat layer 6 is provided on the uppermost layer to protect the card surface.

As a method of providing the overcoat layer 6 on the printing layers 4 and 5, it is common to use a laminating method with heating, but it has been a problem that defects as shown in FIG. 2 occur. . FIG. 2 is a schematic cross-sectional view for explaining an example of defects occurring in a conventional card. When a card having the same structure as that shown in FIG. 1 is manufactured by the conventional method, a crack 7 is formed in the laminating process, as shown in FIG. Sometimes.

  In addition to the cracks 7 from the screen print layer 4, bubbles (not shown) are generated in the laminating process and accumulated between the offset print layer 5 and the overcoat layer 6. Separation may occur.

  On the other hand, in the card manufacturing method of the present invention, bubbles are generated under the overcoat layer and the overcoat layer is cracked or peeled off, or the screen print layer formed as a pattern print layer is cracked. A manufacturing method that does not generate the problem will be described in the order of steps with reference to FIG. FIG. 3 is a process diagram for explaining an example of the process of the present invention.

  In FIG. 3, a magnetic tape (J2) and an oversheet (J1) for directly holding the magnetic tape (J2) are prepared in advance, and both are temporarily attached (S1). Separately, a card base (J3) is prepared, and an oversheet on which the magnetic tape is temporarily attached is temporarily attached to the base (S2). In this state, a laminating process is performed by a mild heat press or the like to sufficiently embed the magnetic tape in the oversheet and to prepare the ground state before printing (S3). Next, screen printing and offset printing are overlapped to form a printing layer (S4). Thereafter, the overcoat transfer foil (J4) prepared in advance is transferred onto the printing layer and the laminating process is performed while heating (S5). Finally, the outer shape of the card is processed (S6) to complete the card.

  To further supplement the above description, PVC or heat-resistant PVC is used as the card substrate 1 (J3) and the oversheet 2 (J1). In this example, the magnetic tape is embedded, but an IC module or another carrier for holding non-visual information can be provided. The temporary attachment (S1) of the magnetic tape to the oversheet and the temporary attachment of the oversheet to the base material (S2) are performed in thermal transfer. Subsequent lamination processing (S3) is performed by thermal lamination.

  In the case of printing in the case of two layers, first, background printing of a pattern is performed by screen printing, and after drying, a detailed pattern is printed by offset printing (S4). The treatment temperature of each step so far including the drying treatment after printing (not shown in FIG. 3) is, for example, the glass transition point of vinyl chloride when using a vinyl chloride sheet as an oversheet to be bonded to the substrate. It does not exceed 60-70 ° C. However, in the laminating and laminating process (S5) of the overcoat transfer foil described later, when the base material, the oversheet, and the transfer foil are bonded by thermal fusion, a higher temperature process is possible.

  The overcoat transfer foil (J4) is a film with a transfer protective layer, and a type in which a resin layer to be an overcoat layer is formed on a film having good peelability is prepared. It is transferred onto the offset printing layer 5 by performing a laminating process by heating at 110 to 165 ° C. for about 10 seconds (S5).

  The ink used for printing is particularly important in preventing the occurrence of problems in the ink composition used for pattern printing by screen printing in the lower layer, in connection with the lamination and laminating process (S5) of the overcoat transfer foil in the subsequent process. In the present invention, the following setting is made.

The screen printing ink is composed of a color pigment, a resin, and a solvent for a pattern. As the resin, polyvinyl chloride, polyvinyl acetate, acrylic, or a copolymer thereof is used. As the solvent, an aromatic hydrocarbon, a ketone compound, an ester compound, or a mixture thereof is used. As an example of a mixture, the content ratio in the ink is 10 to 15% aromatic hydrocarbon, 25 to 35% ketone compound, and 10 to 15% ester compound by weight, respectively. .

  As an example of the solvent mixture, the solvent is classified on the basis of the boiling point of each solvent, and the main solvent having a boiling point equal to or lower than the laminating temperature at the upper limit of 165 ° C., which will be described later, and the laminating temperature. A mixture of secondary solvents having a high boiling point can be obtained. In this embodiment, naphtha having a boiling point of 164 ° C. (aromatic hydrocarbon centered on C9) and cyclohexanone having a boiling point of 156 ° C. (ketone compound) are used as the main solvent, and isophorone having a boiling point of 215 ° C. is used as the auxiliary solvent. When cyclic ketone) and γ-butyrolactone (ester compound) having a boiling point of 198 ° C. are used, unlike the case where only the main solvent is used as the solvent, vaporization and boiling due to the residual solvent of the printing ink under the heating conditions of the lamination process Is suppressed to a certain degree, bubbles generated under the overcoat layer are reduced, and a phenomenon in which the overcoat layer is cracked or peeled off can be prevented.

  Furthermore, the card | curd excellent in the external appearance quality without a pattern crack can be manufactured by substituting all the isophorone used as a subsolvent with (gamma) -butyrolactone. The concentration of γ-butyrolactone, which has a lower molecular weight and lower boiling point than isophorone, increases, and the saturated vapor pressure also rises. Conceivable.

  According to the present invention, since only the surface can be dried by drying after printing, the solvent temporarily remains on the oversheet 2 or the substrate 1, and the high-boiling point solvent remains in the interior even after card production. There is no problem at all at a reliability guarantee temperature of 110 ° C. of the card after manufacture.

  The usage examples of the main solvent and the sub-solvent are listed in Table 1 below together with their physical property values and the contents of the two types of usage examples. Examples of the target ink before solvent dilution are SS-8 series manufactured by Toyo Ink Manufacturing Co., Ltd. or CAD series manufactured by Teikoku Ink Manufacturing Co., Ltd.

  In the above description, a card having a carrier for holding non-visual information such as a magnetic tape and an IC module has been described. However, even in the case of a card having no carrier for holding such non-visual information, the present invention A card manufacturing method that accurately expresses visual information without defects is effective, and provides a high-quality card by laminating a printed layer and an overcoat layer.

DESCRIPTION OF SYMBOLS 1 ... Base material 2 ... Oversheet 3 ... Magnetic tape 4 ... Screen printing layer 5 ... Offset printing layer 6 ... Overcoat layer 7 ... Crack J1 ... Oversheet J2 ... Magnetic tape J3 ... Base material J4 ... Overcoat transfer foil S1 ... Magnetic tape temporary sticking S2 ... Oversheet temporary sticking S3 ... Lamination process (pre-printing process)
S4 ... Printing S5 ... Lamination (lamination)
S6 ... Card outline processing

Claims (1)

  A card manufacturing method comprising a step of transferring and laminating an overcoat layer to a card substrate provided with a printed layer, the main solvent having a boiling point equal to or lower than the laminating temperature on the card substrate, and a laminating temperature. A step of providing a printing layer using an ink containing a mixed solvent with a secondary solvent having a higher boiling point, a step of transferring an overcoat layer onto the printing layer of the card substrate, and a card substrate and overcoat provided with the printing layer A method for producing a card, comprising laminating layers.

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