JP2008089673A - Thermally active label - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a thermally active label which cano discriminate that the label has been issued in the state with insufficient development of adhesiveness without sufficiently applying thermal activation energy to a thermally active adhesive layer in a printer, and can prevent the label from being stuck on a stuck object in the state with the insufficient development of adhesiveness. <P>SOLUTION: A temperature indication layer 13, which is colored when the sufficient thermal activation energy is applied in order to develop the adhesiveness of the thermally active adhesive layer, is formed in contact with the thermally active adhesive layer 12 between a label base material 11 and the thermally active adhesive layer 12 as a temperature indication part, so that it can be discriminated by color development of the temperature indication layer 13 whether or not the adhesiveness of the thermally active adhesive layer 12 is sufficiently developed, and especially when the thermal activation energy is applied from the back side of the label base material 11 and the temperature indication layer 13 develops the color, it can be discriminated that the thermally active adhesive layer 12 surely develops the adhesiveness. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a thermally activated label that does not require a release paper, and relates to a thermally activated label in which a thermally activated adhesive layer that is non-adhesive at room temperature but develops adhesiveness upon heating is formed on the back surface.

  In recent years, thermally activated labels having a thermally activated adhesive layer formed on the back surface thereof have been used for product display labels, price display labels, quality display labels and the like. Thermally active adhesive used for the thermally active adhesive layer is non-adhesive at room temperature but develops adhesiveness when heated, so the thermally active label before printing can be made with no need for release paper. In a printer or an adhesive activation device that prints on the thermal activation adhesive, thermal activation energy is applied to the thermal activation adhesive to cause the thermal activation adhesive to exhibit adhesiveness. Since such a thermally activated label does not require the use of release paper, it can realize the preservation of wood resources that are the raw material of the release paper, the prevention of global warming due to the generation of carbon dioxide gas associated with the incineration treatment of the release paper, This is effective as an environmental measure (see, for example, Patent Document 1).

  However, in the prior art, when sufficient heat activation energy is not applied to the heat active pressure-sensitive adhesive layer, the heat activation label may be issued in a state where the pressure buildup is insufficient, and the pressure buildup is not achieved. There was a problem that it might stick to a thing to be pasted in a sufficient state.

JP 2006-84607 A

  The present invention has been made in view of such problems, and the object of the present invention is a state in which sufficient thermal activation energy is not applied to the thermally active adhesive layer in the printer and the expression of adhesiveness is insufficient. It is in the point of providing a thermally activated label that can identify that the label has been issued and can be prevented from being stuck to an object to be stuck in a state where the expression of adhesiveness is insufficient.

In order to solve the above problems, the present invention has the following configuration.
The gist of the invention described in claim 1 is a thermally activated label in which a thermally activated adhesive layer that exhibits adhesiveness upon heating is formed on the back surface of the label substrate, and the adhesiveness of the thermally activated adhesive layer is increased. The present invention resides in a thermoactive label characterized in that a temperature indicating portion is formed that develops a color when sufficient thermal activation energy is applied for expression.
The gist of the invention described in claim 2 is that the temperature indicating portion is a temperature indicating layer formed in contact with the heat active pressure-sensitive adhesive layer between the label substrate and the heat active pressure-sensitive adhesive layer. It exists in the thermoactive label of Claim 1.
According to a third aspect of the present invention, there is provided a thermosensitive coloring layer formed on the surface of the label base material, and coloration of the temperature indicating layer by heat energy applied to cause the thermosensitive coloring layer to thermally develop color. 3. The thermally activated label according to claim 1, wherein a heat insulating layer to be prevented is formed between the thermosensitive coloring layer and the temperature indicating portion.
According to a fourth aspect of the present invention, a temperature indicating material is added to the thermally active adhesive layer, and the thermally active adhesive layer functions as the temperature indicating portion. 3. It exists in the thermoactive label in any one of 3.

  The thermoactive label of the present invention is configured to form a temperature indicating portion that develops color when sufficient heat active energy is applied to develop the adhesiveness of the heat active pressure-sensitive adhesive layer. Since it is possible to identify whether or not the adhesiveness of the thermally active adhesive layer has been sufficiently developed, sufficient thermal activity energy is not applied to the thermally active adhesive layer in the printer, and the adhesiveness is not sufficiently developed. It is possible to identify that it has been issued in a state, and it is possible to prevent sticking to an object to be stuck in a state where the expression of adhesiveness is insufficient.

  Furthermore, the thermoactive label of the present invention is such that the temperature indicating portion is a temperature indicating layer formed in contact with the heat active pressure-sensitive adhesive layer between the label base material and the heat-active pressure-sensitive adhesive layer, whereby the back side of the label base material That is, when heat activation energy is applied from the surface side where the heat active pressure-sensitive adhesive layer is formed and the temperature indicating layer develops color, it is recognized that the heat-active pressure-sensitive adhesive layer expresses adhesiveness reliably. There is an effect that can be.

  Furthermore, the thermoactive label of the present invention forms a heat-sensitive color forming layer on the surface of the label base material, and heat-insulates the heat-insulating layer that prevents color development of the temperature indicating layer due to applied thermal energy in order to heat-color the color. By forming it between the color-developing layer and the temperature indicating portion, the temperature indicating layer will erroneously develop color even though sufficient heat-active energy is not applied to the heat-active adhesive layer. It is possible to prevent this, and it is possible to reliably identify whether or not the adhesiveness of the thermally active pressure-sensitive adhesive layer is sufficiently expressed by the color development of the temperature indicating layer.

  Furthermore, the thermoactive label of the present invention is constituted by adding a temperature indicating material to the heat active pressure-sensitive adhesive layer so that the heat-active pressure-sensitive adhesive layer itself functions as a temperature indicating portion. Since it is not necessary to form separately, there exists an effect that a manufacturing process can be simplified.

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

(First embodiment)
FIG. 1 is a schematic cross-sectional view showing the configuration of the first embodiment of the thermally activated label according to the present invention.

  With reference to FIG. 1, the thermally activated label 10 of the first embodiment includes a label substrate 11, a thermally activated pressure-sensitive adhesive layer 12 formed on the back side of the label substrate 11, a label substrate 11 and heat. It consists of a temperature indicating layer 13 formed between the active adhesive layer 12.

  As the label base material 11, for example, a paper base material such as fine paper, art paper, or coated paper, or a film base material such as polyester film or polystyrene film can be used, and the material is not particularly limited. .

  The heat-activatable adhesive used for the heat-activatable adhesive layer 12 is a thermoplastic resin that imparts adhesive strength, and a heat-melting material such as a solid plasticizer that melts by heating to swell or soften the resin and develop adhesiveness. It contains a tackifying substance as a main component and, if necessary, contains a tackifier that improves the tackiness. It is non-tacky at room temperature but develops tackiness upon heating. In addition, since the heat-meltable substance in the heat-activatable adhesive slowly crystallizes after melting, the developed adhesiveness is maintained for a long time.

  The thermoplastic resin that is one of the main components of the thermoactive adhesive is not particularly limited, and for example, a polymer resin such as natural rubber latex, polyvinyl acid, and synthetic rubber can be used. The selection of the thermoplastic resin and the content in the heat-sensitive adhesive are appropriately set according to the desired adhesive strength.

  In addition, the heat-meltable substance that is one of the main components of the heat-activatable pressure-sensitive adhesive is not particularly limited. For example, phthalic acid esters such as dihexyl phthalate can be used. The selection of the substance and the content in the heat-sensitive adhesive are appropriately set according to the desired heat sensitivity characteristics.

  Furthermore, the tackifier added to the heat-activatable pressure-sensitive adhesive is not particularly limited. For example, petroleum resin-based, phenol resin-based, rosin derivatives, etc. can be used. The selection of the agent and the content in the heat-sensitive adhesive are appropriately set according to the desired adhesive strength.

  The temperature indicating material used for the temperature indicating layer 13 is not particularly limited, but a dye that changes color at a specific temperature or a compound that changes its state when melted at a specific temperature is used as the dye. It is preferable to use an irreversible temperature indicating material that does not return to its original color once the color changes. In addition, heat accumulation system temperature display materials that use discoloration due to the synergistic effect of temperature and time, semi-irreversible temperature display materials that discolor once after discoloration, and reversible temperature display materials that discolor at a specific temperature or higher and recover when the temperature drops. However, a certain effect can be obtained. Further, the discoloration of the temperature indicating material may be changed from colored to different colored at a specific temperature, or may be changed from colored to colorless and from colorless to colored.

  The color development temperature of the temperature indicating layer 13 is set so as to develop a color when sufficient heat activation energy is applied to cause the heat active pressure-sensitive adhesive layer 12 to exhibit adhesiveness. It is set above the temperature at which sex is manifested. Therefore, when the thermal activation energy is applied from the back surface side of the label substrate 11, that is, the surface side on which the thermally active adhesive layer 12 is formed, and the temperature indicating layer 13 is colored, the thermally active adhesive layer 12 is surely formed. Is expressing adhesiveness.

  Further, the region for forming the temperature indicating layer 13 may be provided so as to correspond to the entire region where the heat-activatable pressure-sensitive adhesive layer 12 is formed, and part of the region where the heat-active pressure-sensitive adhesive layer 12 is formed. Although it may be provided, if the temperature indicating layer 13 is formed across the width direction of the region where the thermally active pressure-sensitive adhesive layer 12 is formed (the direction perpendicular to the traveling direction when thermally activated), Based on the portion where the color is not developed, the damaged portion of the heating element provided in the thermal head to which the thermal activation energy is applied can be grasped.

  As described above, according to the first embodiment, the temperature indicating layer 13 that forms a color when sufficient heat activation energy is applied to develop the adhesiveness of the heat active adhesive layer 12 is formed as the temperature indicating portion. By configuring as described above, it is possible to identify whether or not the adhesiveness of the thermally active adhesive layer 12 is sufficiently expressed by the color development of the temperature indicating layer 13. It can be identified that the thermal activation energy has not been applied and the adhesiveness has been insufficiently developed, and it can be prevented from being stuck on the object to be applied with insufficient adhesiveness. There is an effect of a heat activated label that can be performed.

  Further, according to the first embodiment, the temperature indicating layer 13 is formed so as to be in contact with the thermally active adhesive layer 12 between the label base material 11 and the thermally active adhesive layer 12. When heat activation energy is applied from the back surface side of the base material 11, that is, the surface side on which the heat active adhesive layer 12 is formed, and the temperature indicating layer 13 is colored, the heat active adhesive layer 12 is surely adhesive. There is an effect that it can be recognized that is expressed.

(Second Embodiment)
FIG. 2 is a schematic cross-sectional view showing the configuration of the second embodiment of the thermally activated label according to the present invention.

  With reference to FIG. 2, the thermally activated label 20 of the second embodiment has a thermosensitive coloring layer 21 formed on the surface of the label substrate 11 in addition to the configuration of the first embodiment, and a label group. This is a heat-sensitive recording label in which a heat insulating layer 22 is formed between the material 11 and the temperature indicating layer 13.

  The thermosensitive coloring layer 21 is mainly composed of, for example, a leuco dye such as triphenylmethane, fluorane, phenothiazine, or auramine, and a developer composed of various electron-accepting compounds such as phenolic compounds. In the printer, the heat generating element of the thermal head is selectively heated, whereby the heat-sensitive color developing layer 21 is colored by heat and printing is performed.

  The heat insulating layer 22 is provided in order to prevent the temperature indicating layer 13 from being colored by the heat energy applied from the surface side of the label base material 11 in order to cause the heat sensitive color developing layer 21 to perform heat sensitive color development. The non-foaming heat insulating layer used or the foaming heat insulating layer using a foamable filler can be used.

  As described above, according to the second embodiment, the thermosensitive coloring layer 21 is formed on the surface of the label substrate 11, and the temperature indicating layer by the thermal energy applied to cause the thermosensitive coloring layer 21 to develop a thermosensitive color. By forming the heat insulating layer 22 for preventing color development 13 between the heat sensitive color forming layer 21 and the temperature indicating portion 13, sufficient heat activation energy is not applied to the heat active pressure-sensitive adhesive layer 12. Regardless, it is possible to prevent the temperature indicating layer 13 from being erroneously colored, and to reliably identify whether or not the adhesiveness of the thermally active pressure-sensitive adhesive layer 12 is sufficiently expressed by the coloration of the temperature indicating layer 13. There is an effect that can be.

(Third embodiment)
FIG. 3 is a schematic sectional view showing the configuration of the third embodiment of the thermally activated label according to the present invention.

  As shown in FIG. 3, the thermally activated label 30 according to the third embodiment includes a label substrate 11 and a temperature-thermoactive adhesive layer 31 formed on the back side of the label substrate 11.

  In the indicated thermoactive adhesive layer 31, the thermoactive adhesive 33 is added to the thermoactive adhesive 32, and sufficient thermal activation energy is provided to cause the thermoactive adhesive layer 31 to exhibit the adhesiveness of the thermoactive adhesive 32. When temperature is applied, the temperature indicating material 33 is colored. In the third embodiment, even when sufficient thermal activation energy is applied only to the surface layer of the thermal activation adhesive layer 31, the surface layer of the thermal activation adhesive layer 31 is exposed. Although the temperature indicating material 33 added to the color is colored, a certain effect can be obtained for the purpose of identifying whether or not the thermal activity energy is applied to the temperature indicating thermal activation pressure-sensitive adhesive layer 31.

  As described above, according to the third embodiment, the thermoactive adhesive layer 12 and the temperature indicating layer 13 are configured by forming the temperature indicating thermoactive adhesive layer 31 having a function as the temperature indicating portion. Therefore, there is an effect that the manufacturing process can be simplified.

  Note that the present invention is not limited to the above-described embodiments, and it is obvious that the embodiments can be appropriately changed within the scope of the technical idea of the present invention. In addition, the number, position, shape, and the like of the constituent members are not limited to the above-described embodiment, and can be set to a suitable number, position, shape, and the like in practicing the present invention. In each figure, the same numerals are given to the same component.

It is a schematic cross section which shows the structure of 1st Embodiment of the thermally activated label which concerns on this invention. It is a schematic cross section which shows the structure of 2nd Embodiment of the thermally activated label which concerns on this invention. It is a schematic cross section which shows the structure of 3rd Embodiment of the thermally activated label which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Thermally active label 11 Label base material 12 Thermally active adhesive layer 13 Thermal display layer 20 Thermally active label 21 Thermosensitive coloring layer 22 Thermal insulation layer 30 Thermally active label 31 Thermally active adhesive layer 32 Thermally active adhesive 33 Thermal indicator

Claims (4)

On the back surface of the label substrate, a heat-active label in which a heat-active pressure-sensitive adhesive layer that exhibits adhesiveness by heating is formed,
A thermoactive label, characterized in that a temperature-indicating portion is formed that develops a color when sufficient thermal activation energy is applied to develop the adhesiveness of the thermoactive adhesive layer.   The thermoactive label according to claim 1, wherein the temperature indicating portion is a temperature indicating layer formed between the label base material and the heat active pressure sensitive adhesive layer in contact with the heat active pressure sensitive adhesive layer. A thermosensitive coloring layer is formed on the surface of the label substrate,
The heat insulating color layer is formed between the heat sensitive color forming layer and the temperature indicating portion, wherein a heat insulating layer for preventing color development of the temperature indicating layer by heat energy applied to heat the heat sensitive color developing layer is formed. The heat activated label according to 1 or 2.   The thermoactive label according to any one of claims 1 to 3, wherein a temperature indicating material is added to the heat active adhesive layer, and the heat active adhesive layer functions as the temperature indicating portion.

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