JP2012045720A - Chartaceous-looking card and method for producing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a chartaceous-looking card which is a woody card in appearance or when used, has the folding resistance higher than that of a card made from a paper base material, has smooth surfaces, and can be produced by a low-pressure thermal laminating method without using an adhesive.SOLUTION: The chartaceous-looking card is produced by welding an overcoat base material 4, which is obtained by blending a thermoplastic fiber in a vegetable fiber, to both sides or one side of a core sheet 2 comprising a thermoplastic resin. The thermoplastic fiber is a polyester fiber having 2-4 μm fiber diameter. The core sheet is made from PET-G or PVC. The vegetable fiber is wood pulp having 1-2 μm pulp diameter. The overcoat base material is welded to both sides or one side of the core sheet by the thermal laminating method at the temperature equal to or higher than the glass transition temperature of the core sheet.

Description

  The present invention relates to a configuration of a paper quality card that is a base material such as a magnetic card or an IC card, and a manufacturing method thereof.

  As is well known, magnetic cards are widely used for cash cards, credit cards, ID cards, door locks, etc., and are frequently used everyday by passing them through dedicated machines. Therefore, a rigid resin base material is mainly used. As the resin base material of this card, a thermoplastic resin has been used in consideration of embedding a surface such as a magnetic stripe that can be uneven.

  The appearance and configuration of the card 1 are shown in FIG. 1, and are composed of a core sheet 2, an adhesive layer 5, an overcoat substrate 4, a magnetic stripe 3, and a print layer 6. The thermoplastic resin used as the core sheet 2 is polyvinyl chloride, polyvinyl chloride-polyvinyl acetate copolymer, a copolymer of terephthalic acid, cyclohexanedimethanol and ethylene glycol, terephthalic acid, isophthalic acid and ethylene glycol. Amorphous polyester consisting of a polymer alloy of the above and a copolymer of the copolymer and polycarbonate and / or polyarylate, amorphous resin such as ABS, crystal such as polyethylene terephthalate, polybutylene terephthalate, polyethylene and polypropylene Is used.

  Moreover, the card | curd 1 should just satisfy | fill the thickness 0.68-0.84mm which is a specification of JISX6301, but it is suitable to set it as 0.68-0.80mm from a cost surface. The thickness of the overcoat substrate is ± 10%, and the thickness variation is large compared to the core material. Printing is performed on the surface of the overcoat substrate in order to enhance information transmission and design.

  The adhesive layer 5 is preferably polyvinyl chloride, polyvinyl acetate, polyvinyl alcohol, polyester, polyurethane, or a mixture or copolymer thereof, but is not limited thereto. The magnetic stripe 3 is bonded and arranged by thermal transfer on one side or both sides of the card substrate. The thickness of the magnetic stripe 3 is 10 to 30 μm.

  However, in recent years, in consideration of the natural environment when disposing of used cards, that is, from the viewpoint of avoiding high temperature incineration processing of resin products and landfill processing of resin materials with low degradability in the ground, it has become rigid. Cards using processed natural paper substrates have been used. As a structure of a laminated body suitable for an information recording card or the like using such a paper base material, one disclosed in Patent Document 1 below is known.

  The laminate disclosed in Patent Document 1 uses a natural pulp material as a core sheet, and laminates a sheet of a base material that is similar to the base paper or different in material and form on the core sheet, and then has a linear pressure of 200 to Pressed under pressure conditions of 3500 kg / cm. Specifically, the base material is a synthetic polymer or a semi-synthetic polymer, and a film or a fiber sheet is used for the form.

  Examples of the base paper include chemical pulp of softwood bleached kraft pulp and hardwood bleached kraft pulp, and mechanical pulp such as GP, BCTMP, and MP. Examples of the synthetic polymer as the substrate include polyethylene, polypropylene, PVA, and polystyrene.

By the way, if the core sheet and the overcoat substrate are the same type of thermoplastic resin, they can be joined relatively easily by thermal lamination. However, the core sheet made of a thermoplastic resin such as PVA and a polyolefin film such as polyethylene or polypropylene. Bonding dissimilar substrates such as laminating an overcoat substrate made of is not performed by simply laminating, but as shown in FIG. 1, some hot melt adhesive is interposed between the substrates. It is necessary to let

  However, there is also a strong demand for cards using different materials in order to meet a wide variety of requirements. In this case, in order to select a suitable adhesive, it is necessary to consider the determination of the lamination conditions (temperature, pressure, addition amount of curing agent), the pot life of the adhesive, etc. There is a problem that it becomes necessary.

  On the other hand, in the case of eco-oriented using natural pulp-based materials for the core sheet and overcoat substrate, thermal lamination is not necessary, but at present it is pressurized at a considerable high pressure (linear pressure 200-3500 kg / cm). Otherwise, there is a problem that the unevenness derived from the natural pulp material itself or the magnetic stripe is suppressed, and the necessary surface smoothness and dimensional stability cannot be obtained by carding. In addition, when paper pulp enters the core sheet, there is a problem that rigidity is lowered and folding resistance cannot be obtained.

JP-A-11-70630

  Therefore, the present invention is a fiber card in terms of appearance and touch, but has a higher folding resistance and a smooth card surface than a paper base card, and a low-pressure press without using an adhesive. The purpose was to provide paper quality cards that can be manufactured by law.

In order to solve the above problems, the present invention provides the following means.
The invention according to claim 1 is a paper-like card characterized in that an overcoat base material in which a thermoplastic fiber is blended with a vegetable fiber is fused on both sides or one side of a core sheet made of a thermoplastic resin. Is.

  The invention according to claim 2 is the paper quality card according to claim 1, wherein the thermoplastic fiber is a polyester fiber having a wire diameter of 2 to 4 μm.

  The invention according to claim 3 is the paper quality card according to claim 1 or 2, wherein the core sheet is PET-G or PVC.

  The invention according to claim 4 is the paper quality card according to any one of claims 1 to 3, wherein the plant fiber is wood pulp having a wire diameter of 1 to 2 μm. Is.

  The invention according to claim 5 is characterized in that the weight ratio of vegetable fiber and thermoplastic fiber of the overcoat substrate is 30:70 to 80:20. The paper quality card as described in the section.

The invention according to claim 6 is the heating above the glass transition temperature of the core sheet by disposing an overcoat base material in which the thermoplastic fiber is blended with the plant fiber on both sides or one side of the core sheet made of the thermoplastic resin. This is a method for producing a paper quality card characterized by being heat-laminated at a temperature.

  According to the paper quality card of the present invention, a thermoplastic resin is used for the core sheet base material portion that occupies most of the card volume, and as an overcoat base material covering both sides thereof, a plant fiber containing polyester fiber is used. By adopting the configuration, if the resin component of the overcoat substrate and the resin component of the core sheet are above the glass transition temperature of both, the affinity will increase and only natural pulp will be used without any adhesive. Compared to the above, it has the effect of being easily joined at a low pressure. As a result, sufficient bonding and surface smoothness can be obtained with a flat press even if the pressure is not mechanically applied to the nip.

  Even when the surface of the overcoat substrate is uneven or when there is a magnetic tape between the substrates, the core sheet substrate is softened to absorb the surface unevenness and obtain the card surface smoothness. Therefore, there is an effect that it can be made suitable for printing.

(A) is a perspective view of a magnetic card, (b) is a figure of the cross-sectional view explaining the structure of a magnetic card. It is a figure of the sectional view explaining the structure of the card | curd provided with a magnetic tape part which becomes this invention.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1A is a perspective view of the magnetic card 1, and FIG. 2 is a schematic diagram of a cross-sectional view of the magnetic card 1 showing an embodiment of the present invention.

  As shown in FIG. 2, the magnetic card 1 is configured such that a core sheet 2 made of a thermoplastic resin is sandwiched from above and below by overcoat substrates 4 and 4 each having a magnetic stripe 3. The core sheet 2 and the overcoat substrates 4 and 4 disposed on both upper and lower surfaces thereof are integrally joined. On the surface of the overcoat substrate 4, printed layers 6 and 6 including a design with a pattern may be applied.

  The core sheet 2 is a portion that becomes the core of the magnetic card 1 formed in a substantially rectangular shape, and a thermoplastic resin such as PET-G or PVC is used. The thickness of the core sheet 2 is in the range of 0.4 mm to 0.7 mm, preferably about 0.6 mm. If it is in this range, it has sufficient rigidity, hardness and mechanical strength, and has excellent folding resistance.

The overcoat substrate 4 is formed in a rectangular shape with the same dimensions as the core sheet 2 and is externally mounted on the top and bottom of the core sheet 2. The overcoat substrate 4 is obtained by blending a thermoplastic fiber with a plant fiber and molding it into a sheet shape. The thickness is preferably 0.05 to 0.25 mm, more preferably about 0.2 mm.
In addition, the overcoat base material 4 can be formed only on the single side | surface of a core sheet depending on a use.

  The plant fiber is preferably wood pulp having a wire diameter in the range of 1 to 2 μm and a length of about 1 inch. Specific examples include high-quality paper and medium-quality paper. Examples of the pulp used include chemical pulp of softwood bleached kraft pulp and hardwood bleached kraft pulp, and mechanical pulp such as GP, BCTMP, and MP. It is done. A predetermined amount of thermoplastic fiber may be placed on the paper as it is, or may be molded into a sheet after being mixed with the pulp.

  The polyester fiber occupying the plant fiber is preferably multi-branched and has a wire diameter in the range of 2 to 4 μm, and the proportion is preferably 10 to 90% by weight of the plant fiber. If it is less than 10%, the effect of the polyester component hardly appears, the joint with the core sheet becomes weak, and the dimensional stability is also poor. Conversely, the texture of paper is lost as it increases. Preferably it is about 55%.

  The magnetic stripe 3 is obtained by applying a magnetic recording material to the entire surface of one surface of a PET film or the like, and is disposed on the surface of the overcoat substrate 4 and is flush with the overcoat substrate 4 by pressurization. So that it is buried. The thickness of the magnetic stripe is generally 10 to 20 μm. The unevenness of the surface formed by the magnetic stripe 3 is −5 μm ≦ h ≦ 38 μm (vertical displacement), 0.40 μm or less (average surface roughness) when measured according to JISX6302-6 (ISO / IEC 7811-6). It is supposed to be.

  In this configuration, the overcoat substrate 4 is laminated on the top and bottom of the core sheet 2 with the magnetic stripe 3 as the outer surface, and when the overcoat substrate is pressed, the overcoat substrate becomes the core sheet by the thickness of the magnetic tape. In the case of dents on the side, the resin core sheet is deformed and absorbed so that the surface of the overcoat substrate is smooth even if the magnetic card 2 is present.

  The core sheet 2 and the overcoat base material 4 are bonded together by bringing the overcoat base material 4 into contact with both surfaces or one surface of the core sheet 2 and performing thermocompression bonding (laminate). The heating temperature is preferably at least equal to or higher than the glass transition temperature of the thermoplastic resin of the core sheet, and more preferably equal to or higher than the glass transition temperature of the thermoplastic fiber. Moreover, it is preferable that the glass transition temperature of a thermoplastic resin and a thermoplastic fiber is equal, or a difference is 50 degrees C or less. Further, when the glass transition temperature of the thermoplastic fiber is higher than that of the thermoplastic resin, the deformation of the thermoplastic fiber can be suppressed and the paper quality can be maintained. For example, since the glass transition temperatures of polyester fiber and PET-G are about 70 ° C. and 55 ° C., respectively, it is preferable to heat press at about 70 ° C.

  Next, a method for manufacturing the magnetic card 1 will be described. The magnetic card 1 according to the present invention includes a method (1) in which the magnetic stripe 3 is embedded in the overcoat substrate 4 in advance, and the magnetic stripe 3 is applied when the overcoat substrate 4 is pressure-bonded to the core sheet 2. Since there are two methods of burying (2), both manufacturing methods will be described.

(1) Method of previously embedding the magnetic stripe 3 in the overcoat base material 4 In joining each sheet base material, etc., it may be carried out after forming each base material in a dimension to be a final product. In consideration of work efficiency and material utilization efficiency, each base material is joined using the following full-size sheets, and cut into the final product dimensions in the final production process. The same applies to the method (2) described later.

  First, as shown in FIG. 1 (a), the magnetic stripe 3 is arranged at a predetermined position of the overcoat substrate 4 by thermal transfer, and the magnetic stripe 3 is arranged as shown in FIG. 2 or FIG. 1 (b). Pressure is applied to the overcoat substrate 4 from the side to embed the magnetic stripe 3 in the overcoat substrate 4 so that the surface of the magnetic stripe 3 and the surface of the overcoat substrate 4 are flush with each other.

  At this time, the pressure may be applied by either a surface pressure by a flat plate or the like or a linear pressure by a roll or the like, but a flat plate press is sufficient because the overcoat substrate 4 contains a resin component. Further, heat may be applied simultaneously with pressure in order to improve the adhesion of the magnetic stripe 3.

  Next, on the upper and lower sides of the core sheet 2, the overcoat bases 4 and 4 are arranged so that the surface opposite to the side where the magnetic stripe 3 is embedded is in contact, and one sheet is formed by heating and pressing. (Not shown). The temperature at this time is preferably 80 ° C. to 160 ° C., more preferably 100 ° C. to 140 ° C. The pressure is preferably 0.5 to 5.0 MPa, and more preferably 1.0 to 3.5 MPa.

  Next, printing is performed on the surface of the magnetic card 1. As the printing method, for example, offset printing, screen printing, gravure printing, flexographic printing, and the like are possible. The ink can be UV curable, oily, or water-based. When the protective layer is formed on the magnetic card 1 by printing, the outermost layer is formed.

  The full-size sheet thus formed into one plate is cut into the size of the magnetic card 1 by male and female punches or blades, and the magnetic card 1 as shown in FIGS. 1A and 2 is obtained. It is done.

(2) Method of embedding the magnetic stripe 3 when the overcoat substrate 4 is pressure-bonded to the core sheet 2 When embedding the overcoat substrate 4 to the core sheet 2, the magnetic stripe 3 is embedded In this case, first, the magnetic stripe 3 is arranged by thermal transfer at a predetermined position on the outer surface of the overcoat base material 4, and the overcoat base materials 4 and 4 are attached to the core sheet 2 on the inner surface side. It arrange | positions at the upper and lower sides of the core sheet 2 so that the side may become an outer surface.

Next, pressure is applied from the outer surface of the overcoat substrate 4 on the side of the magnetic stripe 3 to embed the magnetic stripe 3 in the overcoat substrate 4, and at the same time, the overcoating substrate 4 absorbs the convex portions associated therewith. A plate-like body is used.
The plate-like body having the magnetic stripe 3 produced in this way is cut into the dimensions of the magnetic card 1 with a male-female punch or blade and printed on the surface as appropriate, so that FIG. 1 (a) and FIG. A magnetic card 1 as shown is obtained.

  The magnetic card 1 formed as described above is pressed or heated and pressed while holding the core sheet 2 with the overcoat base material 4 on which the magnetic stripe 3 is arranged, whereby the magnetic stripe 3 Can be embedded in the overcoat substrate 4 so as to be flush with each other. Therefore, it is possible to prevent the magnetic stripe 3 from being damaged or easily peeled off by being caught on the magnetic stripe 3. Moreover, since the surface of the magnetic card 1 is smoothed, the effect of improving the printability of the magnetic card surface can also be obtained.

  Furthermore, since a natural paper base is used as the overcoat base 4, it is possible to obtain an effect that it is possible to employ a disposal method that is easy to adapt to the natural environment as a combustible material.

  The present invention is not limited to the magnetic card 1 provided with only the magnetic stripe 3, and can be applied to an IC card and magnetic card in which an IC chip is embedded in the core sheet 2 in addition to the magnetic card 1. In general, it can also be adopted as a method of imparting smoothness to the card surface.

  Hereinafter, the magnetic card 1 of the present invention will be described using examples. However, the magnetic tape may or may not be present.

First, a paper-based overcoat substrate 4 having a thickness of 0.2 mm was prepared. A magnetic stripe 3 having a thickness of 20 μm was disposed at a predetermined position on the overcoat substrate, and was applied by applying pressure at a temperature of 160 ° C. with a surface pressure of 2 MPa. This overcoat base material contains 55% by weight of polyester fiber having a wire diameter of 2 to 4 μm manufactured by Dupont.

Next, the core sheet (PG-WHI-FG manufactured by Mitsubishi Plastics Co., Ltd.) made of PET-G having a thickness of 0.76 mm is overlapped with the magnetic stripe surface facing upward, and is collated and temporarily fixed. A heat laminating press was performed using a metal plate under the conditions of 110 ° C., 1.5 MPa, 20 minutes, and the core sheet 2 and the overcoat substrate 4 were joined. The surface of the overcoat substrate 4 on which the magnetic stripes 3 were arranged was screen-printed to conceal the magnetic tape, and then the pattern layer was printed by offset printing.
Finally, the magnetic card 1 was obtained by cutting into card pieces by punching.

  As Example 2, Oji Paper's Whatlite N720100, which is a foamable paper substrate having a thickness of 0.5 mm and an expansion ratio of 5, is used as an overcoat substrate 4, and a magnetic stripe 3 having a thickness of 20 μm is formed at a predetermined position by thermal transfer. Arranged. This overcoat base material contains 55% by weight of polyester fiber having a wire diameter of 2 to 4 μm manufactured by Dupont.

  As the core sheet 2, a 0.6 mm thick PVC film was used. The overcoat substrate 4 is collated and temporarily fixed to the core sheet 2 so that the magnetic stripe 3 is arranged on the surface side, and a heat laminating press is performed at 120 ° C. and 2.0 MPa using a smooth metal plate. To obtain a single plate-like body having a thickness of 0.8 mm. Then, a picture layer was printed on both sides of the plate by screen printing and offset printing. Thereafter, a laminating press was performed again in the same manner to polish the surface of the magnetic card 1 and cut into card pieces.

The step difference between the magnetic tape portion and the peripheral paper portion of the magnetic cards of Example 1 and Example 2 was measured and found to be 1 μm or less. When Ra of the paper quality part was measured in the same manner, it was 0.4 μm or less and had sufficient smoothness. The print quality was also good.
Note that the present invention can also be applied to an IC card or the like in which a recess is formed in a core sheet and an IC chip is provided in the portion.

1, magnetic card 2, core sheet 3, magnetic stripe 4, overcoat substrate 5, adhesive layer
6. Pattern layer

Claims (6)

  A paper-like card characterized in that an overcoat base material in which a thermoplastic fiber is blended with a vegetable fiber is fused on both sides or one side of a core sheet made of a thermoplastic resin.   2. The paper-like card according to claim 1, wherein the thermoplastic fiber is a polyester fiber having a wire diameter of 2 to 4 [mu] m.   The paper quality card according to claim 1 or 2, wherein the core sheet is PET-G or PVC.   The paper quality card according to any one of claims 1 to 3, wherein the plant fibers are wood pulp having a wire diameter of 1 to 2 µm.   The paper quality card according to any one of claims 1 to 4, wherein a weight ratio of the vegetable fiber and the thermoplastic fiber of the overcoat substrate is 30:70 to 80:20.   It is characterized in that an overcoat base material in which a thermoplastic fiber is blended with a plant fiber is disposed on both sides or one side of a core sheet made of a thermoplastic resin and heat laminated at a heating temperature equal to or higher than the glass transition temperature of the core sheet. To make a paper quality card.

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