JP2017187592A - Thermosensitive recording body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thermosensitive recording body capable of performing excellent thermosensitive recording after pre-printing.SOLUTION: The thermosensitive recording body comprises a first substrate 3 having an adhesive layer 2 on one surface side and a printing layer 4 on the other surface side, and a transparent second substrate 6 having a transparent thermosensitive recording layer 7 on one surface side. The other surface side having the printing layer 4 of the first substrate 3 is bonded to the surface side opposite to the surface having the thermosensitive recording layer 7 of the second substrate 6.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a heat-sensitive recording material, and more particularly to a heat-sensitive recording material having a print layer and a heat-sensitive recording layer.

  The thermal recording medium is colored by a chemical reaction when heated by a thermal head or the like, and a recorded image is obtained. It is not only used as a recording medium for facsimiles, automatic ticket vending machines, and scientific measuring instruments, but also for POS systems such as retail stores. Is used in a wide range of applications as a heat-sensitive recording label (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 2002-362027

  By the way, fixed information such as a predetermined logo mark and background design is pre-printed on the heat-sensitive recording layer of the heat-sensitive recording label by offset printing, etc. In some cases, variable information such as the date of manufacture and the expiration date is thermally recorded on the heat-sensitive recording layer via a layer.

  In this way, when performing thermal recording from above pre-printing, there is a problem in that good thermal recording cannot be performed because thermal conduction from the thermal head to the thermal recording layer is impaired by the step of the printing ink.

  The present invention has been made paying attention to such a situation, and has as its main object to provide a thermal recording material capable of performing good thermal recording after pre-printing.

  In order to achieve the above object, the present invention is configured as follows.

  (1) The heat-sensitive recording material of the present invention has a first base material having a pressure-sensitive adhesive layer on one surface side and a printing layer on the other surface side, and a transparent heat-sensitive recording layer on one surface side. A second transparent substrate, the other surface of the first substrate having the printed layer, and a surface of the second substrate opposite to the surface having the thermosensitive recording layer, It is pasted.

  According to the heat-sensitive recording material of the present invention, the surface side of the second base material having the heat-sensitive recording layer that does not have the heat-sensitive recording layer is bonded to the other surface side having the printed layer of the first base material. There is no printing layer on the thermal recording layer. Therefore, heat transfer from the thermal head to the thermal recording layer is caused by the difference in printing ink, as in the conventional example in which printing is performed on the thermal layer from above the thermal printing layer. Good recording and printing can be performed without damage.

  Moreover, since the 2nd base material which has a thermosensitive recording layer is laminated | stacked on a printing layer, a printing layer can be protected.

  Furthermore, since the heat-sensitive recording layer and the second base material laminated on the print layer are transparent, the printed image of the print layer can be visually recognized through the heat-sensitive recording layer and the second base material.

  (2) In a preferred embodiment of the present invention, the pressure-sensitive adhesive layer is formed on the back surface of the first base material, the printing layer is formed on the surface of the first base material, and the second group The thermosensitive recording layer is formed on the surface of the material, and the surface side of the first base material on which the printing layer is formed and the back surface side of the second base material form an adhesive layer or an adhesive layer. Are pasted together.

  According to this embodiment, the back side of the second base material on which the thermosensitive recording layer is formed on the surface side where the printed layer of the first base material is formed is interposed via the adhesive layer or the pressure-sensitive adhesive layer. Since it is bonded, it has a structure in which the adhesive layer or pressure-sensitive adhesive layer, the second base material, and the heat-sensitive recording layer are laminated on the print layer, and good recording printing on the heat-sensitive recording layer without going through the print layer Can be performed.

  Moreover, since the 2nd base material and the thermosensitive recording layer are laminated | stacked through the adhesive bond layer or the adhesive layer on the printing layer, a printing layer can be protected.

  Furthermore, since the 2nd base material and thermosensitive recording layer which are laminated | stacked on a printing layer are transparent, the printed image of a printing layer can be visually recognized through a thermosensitive recording layer and a 2nd base material.

  (3) In another embodiment of the present invention, the second substrate is a transparent film.

  According to this embodiment, since the 2nd base material on a printing layer is a transparent film, the printed image of a printing layer can be visually recognized through a transparent film.

  (4) In another embodiment of the present invention, the second substrate having the thermosensitive recording layer bonded to the other surface has a haze value of 80% or less.

  According to this embodiment, the second base material having the heat-sensitive recording layer on the print layer has a high haze value of 80% or less, so that the printed image of the print layer can be clearly seen through the heat-sensitive recording layer and the second base material. It can be visually recognized.

  (5) In the embodiment of (4) above, the haze value may be 40% or less.

  According to this embodiment, since the second base material having the heat-sensitive recording layer on the print layer has a high transparency such as a haze value of 40% or less, the visibility of the printed image through the heat-sensitive recording layer and the second base material is further increased. improves.

  (6) In another embodiment of the present invention, the first base material has a metal layer.

  The first substrate only needs to have a metal layer, and therefore has only a metal layer, that is, the first substrate may be a metal layer, or a metal layer is formed on paper or a synthetic film. It may be provided.

  According to this embodiment, since the second base material and the heat-sensitive recording layer laminated on the first base material are transparent, the metal layer of the first base material is visually recognized through the heat-sensitive recording layer and the second base material. For example, when the heat-sensitive recording material is used as a label, the metallic luster of the metal layer can give a high-class feeling or enhance an eye-catching effect.

  Also, labels may be affixed manually to packages, etc., and workers may forget to apply labels by mistake. Also, labels or broken pieces of labels may be present in packages, for example, food. However, since the first substrate has a metal layer, the presence or absence of the label can be easily inspected by passing the metal detector. Thereby, it is possible to easily detect forgetting to attach a label, mixing of a label into food, and the like.

  (7) In another embodiment of the present invention, a release paper covering the surface of the pressure-sensitive adhesive layer on the one surface side of the first base material is provided.

  According to this embodiment, when the thermosensitive recording material is used as a label, the release paper can be peeled off and attached to a package or the like.

  According to the present invention, since the surface side of the second base material having the heat-sensitive recording layer that does not have the heat-sensitive recording layer is bonded to the surface side of the first base material having the printed layer, the heat-sensitive recording layer is formed on the heat-sensitive recording layer. There is no printing layer, so the thermal conduction from the thermal head to the thermal recording layer is impaired by the step of the printing ink, etc., as in the conventional example in which the thermal recording is printed on the thermal recording layer from above the printing layer. Therefore, it is possible to perform good recording printing.

  Moreover, since the 2nd base material which has a thermosensitive recording layer is laminated | stacked on a printing layer, a printing layer can be protected.

  Furthermore, since the heat-sensitive recording layer and the second base material laminated on the print layer are transparent, the printed image of the print layer can be visually recognized through the heat-sensitive recording layer and the second base material.

FIG. 1 is a schematic cross-sectional view of a thermal recording material according to an embodiment of the present invention. FIG. 2 is a schematic cross-sectional view of a thermosensitive recording material according to another embodiment of the present invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a schematic cross-sectional view of a thermal recording material according to an embodiment of the present invention.

  The heat-sensitive recording material 1 of this embodiment has a first pressure-sensitive adhesive layer 2 on the back surface that is one surface and a surface side of the first base material 3 that has the printed layer 4 on the surface that is the other surface, The back surface side of the transparent second base material 6 having the transparent thermosensitive recording layer 7 on the front surface is bonded through the second pressure-sensitive adhesive layer 5.

  Therefore, the heat-sensitive recording material 1 includes the first pressure-sensitive adhesive layer 2, the first base material 3, the printing layer 4, the second pressure-sensitive adhesive layer 5, the transparent second base material 6, and the transparent heat-sensitive recording. The layer 7 is laminated in this order.

  As the pressure-sensitive adhesive for the first pressure-sensitive adhesive layer 2, a conventional pressure-sensitive adhesive used for tack paper or the like can be used. Examples of the pressure-sensitive adhesive include an emulsion system (in which the pressure-sensitive adhesive is dispersed in water), a solvent system (in which the pressure-sensitive adhesive is dissolved in a solvent), and a hot melt system (using thermoplasticity). Examples of the material include adhesives such as synthetic rubber, natural rubber, acrylic resin, polyvinyl ether resin, urethane resin, and silicone resin. The hot melt adhesive may be rubber or acrylic.

  The 1st base material 3 does not have a restriction | limiting in particular, Paper or a film may be sufficient and can be selected from the base materials currently used as base materials, such as conventional tack paper. Examples of such base materials include high-quality paper, art paper, coated paper, craft paper, paper such as laminate paper obtained by laminating a thermoplastic resin such as polyethylene on these paper base materials, synthetic paper, aluminum foil, copper, and the like. Metal foils such as foil and iron foil, porous materials such as non-woven fabrics, polyolefin resins such as polyethylene, polypropylene and various olefin copolymers, polyester resins such as polyethylene terephthalate and polyethylene naphthalate, polystyrene resins, Examples thereof include a polyvinyl chloride resin, an acrylic resin, a polycarbonate resin, a polyamide resin, a fluorine resin, and a plastic sheet made of a mixture or laminate of these resins.

  The print layer 4 is formed by preprinting fixed information such as a logo mark, a product name, a background design, and the like by a known printing method such as offset printing, gravure printing, and silk screen printing.

  On the thermal recording layer 7, variable information other than pre-printed fixed information, such as price, date of manufacture, expiry date, etc., can be recorded thermally with a thermal printer.

  Since the second substrate 6 and the heat-sensitive recording layer 7 are laminated on the pre-printed print layer 4, the printed image by the print layer 4 can be viewed through the second substrate 6 and the heat-sensitive recording layer 7. Therefore, the second substrate 6 and the thermosensitive recording layer 7 are required to be transparent.

  The second substrate 6 may be a transparent substrate, and a transparent synthetic resin film such as a polypropylene film, a polyethylene terephthalate film, a polystyrene film, a polycarbonate film, or the like can be used. Although the thickness of such a film is not particularly limited, for example, about 10 μm to 100 μm is preferable because it is excellent in coating property and transparency.

  As a material for forming the heat-sensitive recording layer 7, a conventionally known material capable of forming a transparent heat-sensitive recording layer, including a color former, a developer, a filler, a binder (binder), a lubricant, and the like that develop color by heating. Can be used.

  In order to improve the transparency of the thermosensitive recording layer 7, it is preferable to use materials having a small particle diameter. By using a material having a small particle diameter in this way, irregular reflection of particles can be suppressed.

  Specifically, examples of the leuco dye that is a color former include 2-aniline-3methyl-6- (N-methyl-P-toluidino) fluorane, and the particle size thereof is 0.8. It is preferably 1 to 1.0 μm. Here, the particle diameter means a 50% average particle diameter measured by a microtrack laser analysis / scattering particle size analyzer.

  Examples of the developer include 3,3′-diallyl-4,4′-dihydroxydiphenyl sulfone, and the particle diameter is preferably 0.1 to 1.0 μm. .

  As said filler, a kaolin, a calcium carbonate etc. can be mentioned, for example, It is preferable that those particle diameters are 1.0 micrometer or less.

  Examples of the binder include a styrene-butadiene copolymer.

  Examples of the lubricant include polyethylene, zinc stearate, paraffin and the like, and the particle diameter thereof is preferably 0.5 μm or less.

  In order to improve transparency, it is particularly effective to contain paraffin, and this paraffin has a low melting point of less than the coloring temperature of the thermal recording layer 7, preferably less than 80 ° C., more preferably less than 50 ° C. Paraffin is preferred.

The particle diameter of the low melting point paraffin is preferably 0.5 μm or less as described above. The content of the paraffin is preferably 0.1 to 1.0 g / m ² by dry weight.

  By containing the low melting point paraffin in this manner, the paraffin is melted when the coating liquid for forming the heat-sensitive recording layer is applied onto the second substrate 6 and dried to form the heat-sensitive recording layer 7. By entering the gaps such as irregularities on the surface of the particles and filling the gaps, the irregular reflection on the particle surface can be suppressed and the transparency can be improved.

  The first pressure-sensitive adhesive layer 2 is formed on the back surface, the surface side of the first base material 3 having the printed layer 4 formed on the surface, and the transparent second base on which the transparent thermosensitive recording layer 7 is formed on the surface. The 2nd adhesive layer 5 which bonds the back surface side of the material 6 can be used without a restriction | limiting especially if it has transparency. Specifically, for example, acrylic polymers, silicone polymers, polyesters, polyurethanes, polyamides, polyvinyl ethers, vinyl acetate / vinyl chloride copolymers, modified polyolefins, epoxy systems, fluorine systems, natural rubbers, rubbers such as synthetic rubbers, etc. Those having the above polymer as a base polymer can be appropriately selected and used.

  A transparent adhesive layer may be provided instead of the second pressure-sensitive adhesive layer 5.

  As described above, the second substrate 6 and the heat-sensitive recording layer 7 are laminated on the preprinted print layer 4, so that the printed image by the print layer 4 can be passed through the second substrate 6 and the heat-sensitive recording layer 7. The second substrate 6 and the heat-sensitive recording layer 7 are preferably highly transparent.

  Therefore, a plurality of types of heat-sensitive films made of the second base material 6 having the heat-sensitive recording layer 7 are prepared, and each heat-sensitive film is applied to the first base material 3 on which the printing layer 4 is formed. Each sample was produced by bonding through the layer 5, and the visibility was evaluated as follows.

  Specifically, a plurality of types of heat-sensitive films having different haze values (HAZE) are bonded to the first base material 3 on which a barcode is pre-printed as the printing layer 4, and the visibility is expressed as a barcode reading rate (% ), ANSI grade, and PCS value (%).

  The haze value (%) was measured using a haze meter in accordance with JIS K 7136.

  The barcode reading probability was calculated by reading the barcode 20 times with a commercially available barcode reader.

  An ANSI (American National Standards Institute) grade was measured using a bar code verifier WoodPecker PC6500 (Munazo Co., Ltd.), and at the same time, a PCS value (Print Contrast Signal) was measured.

  In addition, the thickness of the heat sensitive film bonded to the 1st base material 3 by which the barcode was preprinted was 45 micrometers.

  The results are shown in Table 1 below.

表１において、サンプルＮｏ．１〜６の実施例１〜６は、バーコードがプレ印刷された第１基材３上に、ヘイズ値が異なる感熱フィルム（ラミネート素材）を貼り合せたものである。

In Table 1, sample no. In Examples 1 to 6 of Examples 1 to 6, heat-sensitive films (laminate materials) having different haze values are bonded onto the first base material 3 on which a barcode is pre-printed.

  Example 1 is obtained by laminating a commercially available transparent heat-sensitive film, and Examples 2 and 3 are obtained by laminating heat-sensitive films prepared so as to have different haze values.

  Examples 4 to 6 are applications by the applicant of the present application, and use the same materials and the like as the heat-sensitive recording material having good transparency proposed in Japanese Laid-Open Patent Publication No. 2014-218202. A heat-sensitive film made of the second base material 6 having the heat-sensitive recording layer 7 is prepared and bonded so that the haze values are different.

  Sample No. 7 is a comparative example 1, which is not a heat-sensitive film but a simple transparent film bonded together. Sample No. 8 is the blank which is the comparative example 2 and nothing is pasted together.

  As shown in Table 1, sample no. 1 to 6 of Examples 1 to 6 and Sample No. In both Comparative Examples 1 and 8 of 7 and 8, the barcode reading probability was 100%.

  In Example 1 in which a commercially available heat-sensitive film was bonded to the first base material 3 on which the barcode was pre-printed via the second pressure-sensitive adhesive layer 5, the ANSI grade was C. In contrast, in Examples 2 to 6 in which the respective heat-sensitive films prepared so as to have different haze values were bonded, the ANSI grade was B, which is superior to Example 1.

  The haze value of Example 1 in which ANSI grade is C is 86.76%, and the haze value in Example 2 having the highest haze value among Examples 2 to 6 in which ANSI grade is B, that is, the transparency is low. The value is 73.30%. Therefore, in consideration of ANSI grade, the heat-sensitive film to be bonded has a haze value of preferably 80% or less, and more preferably 75% or less.

  Further, the PCS value is relatively often required to be 85% or more. As shown in Table 1, Examples 1 and 2 have PCS values of less than 85%, while Examples 3 to 6 all have PCS values of 85% or more.

  Among Examples 1 and 2, the PCS value of Example 2 having a high PCS value is 79%, and the haze value of the heat-sensitive film is 73.30%. On the other hand, among Examples 3 to 6, the PCS value of Example 3 having the lowest PCS value is 85%, and the haze value of the heat-sensitive film is 32.84%. Therefore, in order to obtain a PCS value of about 85% or more, the heat-sensitive film to be bonded has a haze value of preferably 40% or less, and more preferably 35% or less.

  As shown in Table 1, the haze value of the thermal film of Example 5 having a PCS value of 90% is 24.29%, and the haze value of the thermal film of Example 6 having a PCS value of 91% is 15%. 94%. Therefore, in order to obtain a PCS value exceeding about 90%, the heat-sensitive film to be bonded has a haze value of preferably 24% or less, and more preferably 20% or less.

  As described above, the second substrate 6 having the heat-sensitive recording layer 7 bonded to the first substrate 3 on which the printed layer 4 is formed is transparent, and the haze value corresponding to the transparency is the above-described value. It is preferable that it is below such a value.

  In the heat-sensitive recording material 1 of the present embodiment, the second base material 6 having the heat-sensitive recording layer 7 bonded to the first base material 3 on which the printing layer 4 is formed is transparent. The image can be easily visually recognized through the thermosensitive recording layer 7 and the second substrate 6.

  Further, since the thermal recording layer 7 is laminated on the printing layer 4, it is not necessary to perform thermal recording through the printing layer as in the conventional example, and the thermal head is transferred from the thermal head to the thermal recording layer 7 due to a step of the printing ink. Therefore, good recording and printing can be performed without impairing the heat conduction.

  Furthermore, since the second substrate 6 and the thermosensitive recording layer 7 are laminated on the print layer 4, the print layer 4 can be protected by the second substrate 6 and the thermosensitive recording layer 7.

  As described above, since the first base material 3 is not particularly limited, for example, so-called tori-washi paper having paper fiber fluff at the periphery can be used. For example, it is suitable for a label to be affixed to a sake or wine bottle.

  Moreover, the 1st base material 3 is good also as a structure which has a metal layer, for example, the 1st base material 3 may be comprised with the metal layer which consists of metal foil, or paper, a synthetic resin film, etc. It is good also as a structure which provided metal layers, such as a coating film which has a metal vapor deposition film and a metal powder as a main component, or bonded metal foil to the base material.

  According to such a configuration, the second base material 6 and the thermosensitive recording layer 7 on the first base material 3 are transparent, so that the metal layer constituting the first base material 3 can be visually recognized and used as a label. In this case, the metallic luster of the metal layer can give a high-class feeling or increase the eye-catching effect that catches the eye.

  Moreover, a label may be affixed by hand to a package etc., and an operator may forget to affix a label accidentally. Moreover, although the label and the fragment of a label generate | occur | produce in the foodstuffs which are packaged goods, since the 1st base material 3 has a metal layer, the presence or absence of a label is easily made by letting a metal detector pass. It can be inspected, and it is possible to easily detect forgetting to attach a label or mixing a label into food.

  The heat-sensitive recording material 1 of the present invention is not limited to the structure shown in FIG. 1, and other layers may be provided. For example, as shown in FIG. 2, a transparent protective layer 8 is formed on the heat-sensitive recording layer 7. Or release paper 9 covering the surface of the first pressure-sensitive adhesive layer 2 may be provided.

DESCRIPTION OF SYMBOLS 1 Thermal recording body 2 1st adhesive layer 3 1st base material 4 Printing layer 5 2nd adhesive layer 6 2nd base material 7 Thermal recording layer 8 Protective layer 9 Release paper

Claims (7)

A first substrate having a pressure-sensitive adhesive layer on one side and a printing layer on the other side;
A transparent second base material having a transparent thermosensitive recording layer on one surface side,
The other surface side of the first base material having the printed layer and the surface side of the second base material opposite to the surface having the thermosensitive recording layer are bonded together.
A heat-sensitive recording material. The pressure-sensitive adhesive layer is formed on the back surface of the first base material, and the printing layer is formed on the surface of the first base material,
The thermosensitive recording layer is formed on the surface of the second substrate;
The front surface side of the first base material on which the printed layer is formed and the back surface side of the second base material are bonded together via an adhesive layer or a pressure-sensitive adhesive layer.
The heat-sensitive recording material according to claim 1. The second substrate is a transparent film;
The heat-sensitive recording material according to claim 1 or 2. The haze value of the second base material having the thermosensitive recording layer bonded to the other surface side is 80% or less.
The heat-sensitive recording material according to any one of claims 1 to 3. The haze value is 40% or less,
The thermosensitive recording material according to claim 4. The first substrate has a metal layer;
The heat-sensitive recording material according to any one of claims 1 to 5. A release paper covering the surface of the pressure-sensitive adhesive layer on the one surface side of the first base material,
The heat-sensitive recording material according to any one of claims 1 to 6.

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