JP2019171834A - Transfer sheet - Google Patents

Abstract

A transfer sheet for use in transfer-type printing is provided which has improved security from transfer to discarding. A transfer sheet (1) includes a base material (10) and a transfer layer (11) provided on one surface side of the base material and including a transfer material that can be transferred from the base material (10) to an object. The transfer layer 11 has the same color. The base material 10 preferably has a first base material layer and a second base material layer of the same color as the transfer layer 11, and the first base material layer is provided on the transfer layer 11 side, and the second base material layer Is preferably provided on the side of the first base material opposite to the transfer layer 11. [Selection diagram] Fig. 1

Description

  The present invention relates to a transfer sheet.

  Conventionally, since the vouchers, cards, various certificates, etc. have qualifications and certain economic values and effects, the owner's personal information is displayed, but the personal information is prevented from leaking, and , Durability against external force during use is necessary.

  As a method for displaying personal information, printing (display) by a thermal transfer method (thermal transfer method) using a transfer sheet, for example, a thermal transfer sheet, is widely used. The thermal transfer sheet is also called a thermal ribbon, and is used as a so-called ink ribbon of a thermal transfer printer (for example, Patent Document 1).

  The thermal transfer sheet of Patent Document 1 is formed, for example, by providing at least a transfer layer (thermal transferable ink layer) on one surface of a substrate sheet. The thermal transfer sheet having such a configuration is used as an ink ribbon, and a part of the thermal transferable ink layer is melted (melt transfer method) by heat applied from the thermal head of the printer, or a part of the thermal transferable ink layer is used. By sublimating a sublimation dye (sublimation transfer method), thermal transfer recording can be performed on the transfer target side.

  These thermal transfer methods are widely used as recording methods for various printing objects such as ID card cards such as identification cards and home delivery labels due to the small size of the printer and high printing durability. It has become.

  However, in the case of the thermal transfer method using an ink ribbon, after printing, the transferred (transferred) portion of the transfer layer has fallen off, so that the negative information is formed by the remaining transfer layer. Therefore, if the printed ink ribbon is discarded as it is, there is a risk of personal information leaking. For this reason, with regard to ink ribbons, waste must be handled as confidential information including personal information. Unlike ordinary waste, special processing such as securing storage locations, shredding and incineration during disposal is required. Was demanded.

Japanese Patent Laid-Open No. 10-58728

  An object of the present invention is to provide a transfer sheet that is used for transfer-type printing and has improved security until it is discarded after transfer.

Such an object is achieved by the present invention described in the following (1) to (7).
(1) a base material;
A transfer layer provided on one surface side of the base material and including a transfer material that can be transferred from the base material to an object;
The transfer sheet, wherein the substrate and the transfer layer have the same color.

(2) The transfer sheet according to (1), wherein the base material includes a resin material and a colorant.
(3) The transfer sheet according to (2), wherein the colorant includes carbon black.

  (4) The transfer sheet according to (2) or (3), wherein the resin material is polyester.

  (5) The transfer sheet according to any one of (1) to (4), wherein the base material includes a first base material layer and a second base material layer having the same color as the transfer layer.

(6) The first base material layer is provided on the transfer layer side,
The transfer sheet according to any one of (1) to (5), wherein the second substrate layer is provided on the opposite side of the first substrate from the transfer layer.

  (7) The transfer sheet according to any one of (1) to (6), wherein the transfer product is a heat transferable ink.

  According to the present invention, in a transfer sheet used in a transfer system, information remaining on a transfer sheet after information output is difficult to read with a simple configuration, so that security is ensured until it is discarded after transfer. It is possible to provide a transfer sheet having an improved image quality.

It is a typical longitudinal section showing a suitable embodiment (1st embodiment) of a transfer sheet of the present invention. It is a typical longitudinal section showing a suitable embodiment (1st embodiment) of a transfer sheet of the present invention. It is a typical longitudinal cross-sectional view which shows suitable embodiment (2nd Embodiment) of the transfer sheet of this invention. It is a perspective view which shows a mode that negative information remains on the transfer sheet.

Hereinafter, preferred embodiments of the present invention will be described in detail.
<< First Embodiment >>
[Transfer sheet]
First, the transfer sheet of the present invention will be described.
FIG. 1 is a schematic longitudinal sectional view showing a preferred embodiment of the transfer sheet of the present invention.

  The transfer sheet 1 </ b> A (1) of the present embodiment includes a base material 10 and a transfer layer 11 that is provided on one surface side of the base material 10 and includes a transfer material that can be transferred from the base material 10 to an object. The transfer sheet 1 of the present embodiment is characterized in that the base material 10 and the transfer layer 11 are the same color.

  As described above, in the transfer sheet immediately after printing by the transfer method, the transfer layer of the printed (transferred) portion has fallen out, so that the negative information is formed by the remaining transfer layer (FIG. 4). reference). Therefore, if the transfer sheet 1 is discarded as it is, personal information may be read by a malicious third party and used for malicious acts such as making a copy.

  Therefore, in the transfer sheet 1A (1) of the present embodiment, by making the base material 10 and the transfer layer 11 the same color, it is difficult to read the information remaining on the transfer sheet after use with a simple configuration. To do. This prevents leakage of confidential information such as personal information and enhances security. In addition, special processing such as securing a storage location, shredding processing at the time of disposal, and incineration processing, which has been necessary in the past, becomes unnecessary.

Here, “same color” in this specification is the same color when a person visually recognizes the difference in color and cannot be distinguished. Specifically, the color difference ΔE ^* _ab defined in JIS K5600-4-6: 1999 is preferably 3 or less, more preferably 1 or less.

<Base material>
The substrate 10 serves as a support that supports the transfer layer 11.
The base material 10 includes a resin material and a colorant.

(Resin material)
As the resin material, a resin material conventionally used as a material for a base material of a transfer sheet can be applied. Specific examples include polyesters such as polyethylene terephthalate, polypropylene, polystyrene, polyimide, aramid, and polyamide.

  The resin material is preferably polyester. Among these, polyethylene terephthalate can be preferably used from the viewpoint of heat resistance and acquisition cost.

(Coloring agent)
The base material 10 contains an organic colorant or an inorganic colorant as a colorant, and can be appropriately selected according to the color for which the base material 10 is to be colored.

  Examples of inorganic pigments that are inorganic colorants include carbon black, cobalt dyes, iron dyes, chromium dyes, titanium dyes, vanadium dyes, zirconium dyes, molybdenum dyes, ruthenium dyes, and platinum. System dyes and the like. These inorganic colorants can be used alone or in combination of two or more.

  Examples of organic pigments and organic dyes that are organic colorants include aminium dyes, cyanine dyes, merocyanine dyes, croconium dyes, squalium dyes, azurenium dyes, polymethine dyes, naphthoquinone dyes, Pyrylium dyes, phthalocyanine dyes, naphthalocyanine dyes, naphtholactam dyes, azo dyes, condensed azo dyes, indigo dyes, perinone dyes, perylene dyes, dioxazine dyes, quinacridone dyes, isoindolinone dyes Dye, quinophthalone dye, pyrrole dye, thioindigo dye, metal complex dye (metal complex dye), dithiol metal complex dye, indolephenol dye, triallylmethane dye, anthraquinone dye, dioxazine dye, naphthol Pigments, Zomechin dyes, benzimidazolone pigments, pyranthrone pigments and threne color, and the like. These organic colorants can be used singly or in combination of two or more.

  The colorant preferably contains a black pigment. When the transfer layer is black (black), by coloring the base material 10 to black, it is possible to make it harder to recognize a portion that has been removed by transfer.

  The kind of the black pigment is not particularly limited as long as the black appearance can be imparted to the substrate 10, but it is preferable to use carbon black as the colorant from the viewpoint of cost and low environmental burden.

  Carbon black has different dispersibility in the resin material depending on the particle diameter. The smaller the particle size is, the higher the dispersibility becomes, so it is preferable for improving the concealability (blackness). However, on the other hand, if the particle size of the carbon black is too small, the particles are aggregated and an aggregate having a large diameter is easily formed. From the above, the average particle size of the black pigment is preferably 10 nm or more and 100 nm or less, and particularly preferably 10 nm or more and 30 nm or less.

  Here, the “average particle diameter” in the present specification is a value obtained by measurement with a laser diffraction particle size distribution measuring apparatus.

  In the present embodiment, the content of the colorant in the resin material constituting the substrate 10 is preferably 1% by mass or more and 30% by mass or less, and more preferably 5% by mass or more and 20% by mass or less. . When the content of the colorant is 1% by mass or more, a good appearance and concealability can be imparted to the substrate 10.

  The thickness of the substrate 10 varies depending on the use of the transfer sheet 1A (1) in addition to mechanical strength, heat resistance, thermal conductivity, thermal expansion coefficient, ease of handling, or availability, but is 2 μm or more. It is preferably 12 μm or less, and more preferably 2 μm or more and 6 μm or less.

<Transfer layer>
Examples of the transfer method of the transfer layer 11 include a pressure-sensitive transfer method and a thermal transfer method (thermal transfer method).

  The transferred material is preferably a heat transferable ink, and the transfer layer 11 is preferably a heat transferable ink layer.

Hereinafter, a thermal transfer ink layer as the transfer layer 11 will be described.
((Thermal transfer ink layer))
The thermal transfer ink layer is a layer in which a dye or a pigment is supported by an arbitrary binder resin. The dye or pigment to be used is not particularly limited, and any dye or pigment used in a conventionally known thermal transfer sheet can be used.

  Examples of the thermal transfer ink layer include, but are not particularly limited to, a sublimation transfer layer using an ink having a property of sublimation by the heat of the thermal head, and a thermal melt transfer layer using an ink that is melted by the heat of the thermal head. .

(Dye or pigment)
A sublimation disperse dye is preferable as the heat sublimation dye used in the sublimation transfer layer forming ink. For example, as yellow components, solvent yellow 56, 16, 30, 93, 33, disperse yellow 201 are used. 231 and 33. Examples of the magenta component include C.I. I. Disperse thread 60, disperse violet 26, C.I. I. Solvent Red 27, or C.I. I. Solvent Red 19 may be mentioned. As the cyan component, C.I. I. Disperse blue 354, 24, C.I. I. Solvent Blue 63, 36 etc. are mentioned.

  Examples of the dye used in the ink for forming the heat melting transfer layer include diarylmethane, triarylmethane, thiazole, methine, azomethane, xanthene, axazine, thiazine, azine, acridine, azo, Commonly used thermal transfer dyes such as spirodipyran, isodolinospiropyran, fluorolane, rhodamine dactam, anthraquinone and the like can be widely used.

  As the pigment used in the ink for forming the hot melt transfer layer, known organic pigments and inorganic pigments can be used. For example, carbon black, azo series, phthalocyanine series, cixaridon series, thioindigo series, anthraquinone And pigments such as those based on isoindoline.

(Binder resin)
As the binder resin, conventionally known ones can be used. Vinyl resins such as polyvinyl alcohol, polyvinyl acetate, polyvinyl pyrrolidone, polyvinyl acetal, polyvinyl butyral, ethyl cellulose, methyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, cellulose acetate, butyric acid Specific examples include cellulose resins such as cellulose and cellulose propionate, polyester resins, phenoxy resins, styrene-acrylonitrile copolymer resins, polycarbonate resins, polyacrylamide resins, and other resins with excellent heat resistance and dye transfer properties. Can be mentioned.

  The glass transition point of the binder resin is preferably 60 ° C. or higher, more preferably 110 ° C. or higher. When the glass transition point is low, there is a high possibility of causing printing defects.

  The weight ratio of the dye or pigment to the binder resin is preferably about 30 to 300 parts by mass, more preferably 50 to 200 parts by mass with respect to 100 parts by mass of the binder resin. If it is less than 30, the concentration of the dye or pigment will be low, and the print density will be insufficient, making it difficult to obtain good thermal transfer printing. On the other hand, when it is larger than 300 parts by mass, the transfer layer becomes brittle.

  In addition to the pigment or dye and the binder resin, additives such as a release agent, a softening agent, and a surfactant can be appropriately added to the transfer layer 11.

  In such a transfer sheet 1A (1), since the base material 10 and the transfer layer 11 are the same color, it is difficult to read information remaining on the transfer layer 11 after use with a simple configuration. be able to. This prevents leakage of confidential information such as personal information and enhances security. In addition, special processing such as securing a storage location, shredding processing at the time of disposal, and incineration processing, which has been necessary in the past, becomes unnecessary.

  As shown in FIG. 2, in the transfer sheet 1 </ b> A (1) of the present embodiment, a protective layer 14 may be formed between the base material 10 and the transfer layer 11. The protective layer 14 is transferred from the transfer sheet 1 together with the transfer layer 11, and protects the print formed on the transfer medium by the transfer layer 11 from scratching.

  In addition, in the transfer sheet 1A (1) of the present embodiment, between the base material 10 and the transfer layer 11 (between the base material 10 and the protective layer 14 when the protective layer 14 is formed), A release layer 15 may be formed. The release layer 15 enhances the peelability at the time of transfer (during thermal transfer) of the transfer layer 11 and the protective layer 14 from the substrate 10 in the transfer sheet 1A (1).

  Further, the back coat layer 16 may be formed on the surface of the substrate 10 opposite to the side on which the transfer layer 11 is formed. The back coat layer 16 improves the heat resistance of the transfer sheet 1A (1), the running performance of the thermal head during printing (during thermal transfer), and the like.

  These protective layer 14, release layer 15 and backcoat layer 16 can all be known release layers, protective layers and backcoat layers that are usually used in conventional transfer sheets (thermal transfer sheets). .

<< Second Embodiment >>
Next, a second embodiment of the transfer sheet of the present invention will be described.

  FIG. 3 is a schematic longitudinal sectional view showing a preferred embodiment (second embodiment) of the transfer sheet 1 of the present invention.

  In the following description, portions that are different from the first embodiment described above will be mainly described, and descriptions of portions that are common to the first embodiment will be omitted.

  The transfer sheet 1 </ b> B (1) of the present embodiment includes a base material 10 and a transfer layer 11 that is provided on one surface side of the base material 10 and includes a transfer material that can be transferred from the base material 10 to an object. In the transfer sheet 1 of this embodiment, the base material 10 and the transfer layer 11 are the same color.

  In particular, in the transfer sheet 1 of the present embodiment, the base material 10 includes a first base material layer 12 and a second base material layer 13 having the same color as the transfer layer 11.

  The first base material layer 12 is provided on the transfer layer 11 side, and the second base material layer 13 is provided on the opposite side of the first base material layer 12 from the transfer layer 11.

  In the transfer sheet 1 </ b> B (1) of the present embodiment, the base material 10 has a two-layer structure including a first base material layer 12, a second base material layer 13, and a second base material layer 13 having the same color as the transfer layer 11. By disposing on the side away from the transfer layer 11, the first substrate layer 12 is disposed between the transfer layer 11 and the second substrate layer 13 having the same color as the transfer layer 11. That is, due to the thickness effect due to the transfer layer 11 and the second base material layer 13 being spaced apart from each other, it becomes more difficult to read information remaining on the transfer sheet 1B (1) after use, and security is further increased. Can be increased.

  The first base material layer 12 includes a resin material, and the second base material layer 13 includes a resin material and a colorant.

  As a resin material which comprises the 1st base material layer 12 and the 2nd base material layer 13, the thing similar to the resin material which comprises the base material 10 in 1st Embodiment mentioned above can be used. Also, as the colorant contained in the second base material layer 13, the same resin material as that contained in the base material 10 in the first embodiment described above can be used.

  As thickness of the 1st base material layer 12 which comprises the base material 10, from the viewpoint by the thickness effect mentioned above, it is preferable that they are 1 micrometer or more and 6 micrometers or less, and it is more preferable that they are 1 micrometer or more and 3 micrometers or less. Further, the thickness of the second base material layer 13 is preferably 1 μm or more and 6 μm or less, more preferably 1 μm or more and 3 μm or less from the viewpoint of the concealing effect of the transfer layer after use.

  Further, as the transfer layer 11, the same material as that constituting the transfer layer 11 in the first embodiment described above can be used.

  Although the embodiment of the present invention has been described above, the present invention is not limited to this, and can be appropriately changed without departing from the spirit of the invention.

DESCRIPTION OF SYMBOLS 1 Transfer sheet 10 Base material 11 Transfer layer 12 1st base material layer 13 2nd base material layer 14 Protective layer 15 Release layer 16 Backcoat layer

Claims (7)

A substrate;
A transfer layer provided on one surface side of the base material and including a transfer material that can be transferred from the base material to an object;
The transfer sheet, wherein the substrate and the transfer layer have the same color.   The transfer sheet according to claim 1, wherein the base material includes a resin material and a colorant.   The transfer sheet according to claim 2, wherein the colorant contains carbon black.   The transfer sheet according to claim 2, wherein the resin material is polyester.   The transfer sheet according to any one of claims 1 to 4, wherein the base material includes a first base material layer and a second base material layer having the same color as the transfer layer. The first base layer is provided on the transfer layer side,
The transfer sheet according to claim 1, wherein the second base material layer is provided on the opposite side of the first base material from the transfer layer.   The transfer sheet according to claim 1, wherein the transfer product is a thermal transfer ink.

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