adhesive labels

Abstract

To provide an adhesive label which has superior adiabaticity.SOLUTION: In an adhesive label 1, two layers of adhesive layers 3 and two layers of base materials 2 are laminated alternately on a top surface 4a of release paper 4. Air layers 5, 6 are provided at a portion where the adhesive layer 3 is not provided, between the base materials 2 adjoining each other across the adhesive layer 3 and between the base material 2 and the release paper 4 adjoining each other across the adhesive layer 3.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to an adhesive label to be used in an insulated container that contains food or the like to be heated in a microwave oven. [Background technology]

[0002] BACKGROUND ART Conventionally, insulated containers have been proposed for storing food to be heated in a microwave oven, soup, hot coffee, and the like.

[0003] For example, a heat-shrinkable polyester film has been proposed, in which the maximum shrinkage stress at 75°C in the main shrinkage direction of the film is 4.4 MPa or more and 12.0 MPa or less, the shrinkage rate in the main shrinkage direction when the film is stored for 8 hours in an atmosphere of 60°C and 40% RH is 2.0% or less, and the shrinkage rate in the main shrinkage direction when the film is immersed in hot water at 80°C for 10 seconds is 10% or more and less than 80%. It is described that the use of such a heat-shrinkable polyester film can provide a heat-shrinkable container that quickly shrinks upon heating to form a heat-insulating grip, and that does not require storage under temperature control even in seasons when the outside temperature rises (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2012-36272 Summary of the Invention [Problem to be solved by the invention]

[0005] However, the insulated container described in Patent Document 1 has a problem in that the insulated container remains hot when held by hand after heating, and the insulating effect is insufficient.

[0006] Therefore, the present invention has been made in consideration of the above-mentioned problems, and aims to provide an adhesive label that is used in an insulated container that contains food or the like to be heated in a microwave oven, and that has excellent insulating properties. [Means for solving the problem]

[0007] In order to achieve the above object, in a first aspect of the present invention, a plurality of adhesive layers and a plurality of substrates are alternately laminated on the surface of a release paper. , mounted in an insulated container that is heated in a microwave oven An adhesive label, in which an air layer is provided in advance between adjacent substrates with an adhesive layer interposed therebetween, and between the substrate and release paper adjacent to each other with an adhesive layer interposed therebetween, in a portion where no adhesive layer is provided. , no heat shrinkage It is characterized by:

[0008] According to the above configuration, the heat insulating properties of the adhesive label are improved, so that the adhesive label can be touched for a long time even after the insulated container to which the adhesive label is attached has been heated.

[0009] In addition, in a second invention, in the first invention, the adhesive layer is two layers and the substrate is two layers.

[0010] In addition, in a third invention, in the first invention, the adhesive layer has three layers and the substrate has three layers.

[0011] In addition, in a fourth invention, in any one of the first to third inventions, the thickness of the air layer is set to 5 to 50 μm.

[0012] According to the above configuration, the heat insulating properties of the pressure-sensitive adhesive label can be reliably improved.

[0013] In addition, a fifth invention is any one of the first to fourth inventions, wherein the adhesive layer is provided on a pair of opposing end portions of the base material in plan view.

[0014] In addition, in a sixth invention, in any one of the first to fifth inventions, when the area of ​​the adhesive layer in a plan view is S1 and the area of ​​the base material is S2, the relationship 0.15≦S1 / S2≦0.75 holds.

[0015] According to the above configuration, it is possible to sufficiently improve the heat insulating properties of the pressure-sensitive adhesive label without causing the inconvenience of a decrease in adhesive strength to the insulated container. [Effects of the Invention]

[0016] According to the present invention, it is possible to provide a pressure-sensitive adhesive label that has excellent heat insulating properties even after heating. [Brief explanation of the drawings]

[0017] [Figure 1] FIG. 1 is a plan view illustrating the adhesive label of the present embodiment. [Figure 2] 2 is a cross-sectional view taken along the line AA in FIG. 1. [Figure 3] FIG. 10 is a diagram showing a state in which an adhesive label is attached to an insulated container. [Figure 4] FIG. 10 is a cross-sectional view illustrating a pressure-sensitive adhesive label according to a modified example. [Figure 5] FIG. 10 is a plan view illustrating a pressure-sensitive adhesive label according to a modified example. DETAILED DESCRIPTION OF THE INVENTION

[0018] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the following embodiments.

[0019] FIG. 1 is a plan view for explaining the pressure-sensitive adhesive label of the present embodiment, and FIG. 2 is a cross-sectional view taken along line AA in FIG.

[0020] As shown in FIGS. 1 and 2, the adhesive label 1 of this embodiment has a structure in which two base layers 2 and two adhesive layers 3 are alternately laminated.

[0021] The substrate 2 is not particularly limited as long as it has heat insulating properties, and examples thereof include fine paper, kraft paper, glassine paper, synthetic paper, art paper, cast coated paper, coated paper, and plastic film.

[0022] The thickness of the substrate 2 is not particularly limited, but from the viewpoint of reliably improving the heat insulating properties of the adhesive label 1, it is preferably about 60 to 250 μm.

[0023] As shown in Figures 1 and 2, the adhesive layer 3 is provided on a pair of opposing ends 2a, 2b of each substrate 2 in a planar view, and multiple adhesive layers 3 are stacked with the substrate 2 interposed therebetween.

[0024] This adhesive layer 3 is a layer for adhering the adhesive label 1 to an insulated container for storing food to be heated in a microwave oven, soup, hot coffee, etc., and is formed from, for example, an acrylic adhesive, a rubber adhesive, a silicone adhesive, an emulsion-type adhesive, a solvent-type adhesive using an organic solvent, a hot-melt-type adhesive, etc.

[0025] The thickness of the adhesive layer 3 is not particularly limited, but from the viewpoint of heat insulation, it is preferably about 5 to 50 μm, similar to the thickness T of the air layer 5 described below.

[0026] 2, the adhesive label 1 has a release paper 4 with one surface subjected to a release treatment, and has a structure in which an adhesive layer 3 is laminated on the release-treated surface 4a of the release paper 4. As shown in FIG. 2, a plurality of adhesive layers 3 and a plurality of base materials 2 are alternately laminated on the surface 4a of the release paper 4.

[0027] The release paper 4 is made of paper such as fine paper, art paper, coated paper, kraft paper, and laminated paper obtained by laminating a thermoplastic resin such as polyethylene onto any of these paper base materials.

[0028] One surface 4a of the release paper 4, which contacts the adhesive layer 3, is subjected to a release treatment in which a release agent layer mainly made of silicone is provided.

[0029] As shown in Figure 3, the adhesive label 1 is fixed to the insulated container 8 by peeling off the release paper 4 and attaching the exposed adhesive layer 3 to the outer wall surface 7a of the insulated container 8, thereby attaching the adhesive label 1 to the insulated container 8.

[0030] When the heated insulated container is to be held with both hands, a plurality of adhesive labels 1 are attached to the outer wall surface 7a of the insulated container 8 as shown in FIG.

[0031] Here, the adhesive label 1 of this embodiment is characterized in that, as shown in Figure 2, an air layer 5 is provided between two adjacent layers of base material 2 laminated with an adhesive layer 3 therebetween, in a portion where the adhesive layer 3 is not provided, and an air layer 6 is provided between adjacent base material 2 laminated with an adhesive layer 3 therebetween and release paper 4, in a portion where the adhesive layer 3 is not provided.

[0032] By providing a plurality of air layers 5, 6 in this way, the heat insulating properties of the adhesive label 1 are improved, and therefore by attaching the adhesive label 1 to an insulated container 8 containing food or the like to be heated in a microwave oven, the heat insulating effect of the adhesive label 1 is fully exerted even when the insulated container 8 after heating is held by hand. As a result, the adhesive label 1 attached to the insulated container 8 after heating can be touched for a long time (for example, 10 seconds), improving convenience.

[0033] Furthermore, the conventional heat-shrinkable polyester film has a poor appearance after shrinkage, and this poor appearance becomes particularly noticeable when the film is printed with letters, designs, etc. Furthermore, in the conventional insulated containers described above, the entire container is sealed with a heat-shrinkable film, but the heat-shrinkable film shrinks during sealing, which has the problem that the film cannot be used after sealing.

[0034] On the other hand, the pressure-sensitive adhesive label of the present invention does not shrink due to heat, and therefore has a good appearance and can be used by being sealed.

[0035] The thickness T of the air layers 5, 6 is not particularly limited, but from the viewpoint of reliably improving the heat insulating properties while suppressing the overall thickness of the adhesive label 1, it is preferably 5 to 50 μm, more preferably 10 to 40 μm, and particularly preferably 15 to 30 μm.

[0036] Furthermore, as shown in Figure 1, when viewed in a plane, if the area of ​​the adhesive layer 3 is S1 (i.e., Sa + Sb) and the area of ​​the base material 2 is S2 (i.e., Sa + Sb + Sc), it is preferable that the ratio of the area S1 of the adhesive layer 3 to the area S2 of the base material 2 (= S1 / S2) satisfies the relationship 0.15≦S1 / S2≦0.75.

[0037] This is because if it is less than 0.15, there may be a disadvantage of a decrease in adhesive strength to the insulated container 8, and if it is greater than 0.75, the volume of the air layers 5, 6 will decrease, and the insulating properties of the adhesive label 1 may not be sufficiently improved.

[0038] The above embodiment may be modified as follows.

[0039] In the above embodiment, two layers of adhesive layer 3 and two layers of base material 2 are alternately laminated, but a configuration in which three layers of adhesive layer 3 and three layers of base material 2 are alternately laminated on the surface of release paper 4, as in the adhesive label 10 shown in Figure 4, may also be used.

[0040] In this case as well, air layers 5 and 7 are provided between adjacent substrates 2 with the adhesive layer 3 interposed therebetween in the areas where the adhesive layer 3 is not provided, and air layer 6 is provided between adjacent substrates 2 and release paper 4 with the adhesive layer 3 interposed therebetween in the areas where the adhesive layer 3 is not provided, so that the heat insulating properties of the adhesive label 10 are improved, similarly to the adhesive label 1 in the above embodiment. As a result, it becomes possible to touch the adhesive label 10 attached to the insulated container 8 after heating for a long time (for example, 10 seconds), thereby improving convenience.

[0041] In addition, in the above embodiment, the adhesive layer 3 is provided on a pair of opposite ends 2a, 2b in the short direction of the base material 2, but the adhesive layer 3 may also be provided on a pair of opposite ends 2c, 2d in the long direction of the base material 2, as in the adhesive label 20 shown in Figure 5.

[0042] As with the above-described adhesive label 1, when the area of ​​the adhesive layer 3 is S1 (i.e., Sd+Se) and the area of ​​the base material 2 is S2 (i.e., Sd+Se+Sf) in a planar view, it is preferable that the ratio of the area S1 of the adhesive layer 3 to the area S2 of the base material 2 (=S1 / S2) satisfies the relationship 0.15≦S1 / S2≦0.75. [Example]

[0043] The present invention will be described below based on examples. However, the present invention is not limited to these examples, and these examples can be modified or changed based on the spirit of the present invention, and such modifications are not excluded from the scope of the invention.

[0044] Example 1 (Making adhesive labels) Two layers of acrylic adhesive layers and two layers of high-quality paper were alternately laminated on the surface of a release paper (high-quality tack paper), and an adhesive label with an air layer (thickness T: 15 μm) as shown in Figures 1 and 2 was produced.

[0045] When the area of ​​the adhesive layer in plan view is S1 and the area of ​​the base material is S2, the adhesive layer was provided so that S1 / S2=0.31.

[0046] (Temperature measurement of insulated containers and adhesive labels) Next, the adhesive label prepared was attached to the outer wall surface of an insulated container (a roughly cylindrical paper container with a diameter of 145 mm and a height of 30 mm wrapped in shrink film, with a height of 50 mm when a plastic lid is attached) by peeling off the release paper and adhering the exposed adhesive layer to the insulated container.

[0047] The insulated container with the adhesive label attached was then placed in a microwave oven and heated at 1500W for 70 seconds, after which the temperatures of the container and adhesive label after heating were measured using an infrared radiation thermometer (manufactured by Sato Keiryoki Seisakusho Co., Ltd., product name: Infrared radiation thermometer SK-8900).

[0048] Then, based on the measured temperature of the adhesive label, the heat insulating property of the adhesive label was evaluated according to the following evaluation criteria. The results are shown in Table 1.

[0049] Can touch adhesive label for more than 10 seconds: Yes The adhesive label can be touched for less than 10 seconds: △ You can only touch the adhesive label for a moment: × Example 2 Three layers of acrylic adhesive layers and three layers of high-quality paper were alternately laminated on the surface of a release paper (high-quality tack paper), to produce an adhesive label with an air layer (thickness T: 15 μm) as shown in Figure 4.

[0050] The adhesive layer was provided on a pair of opposing ends in the short direction of the high-quality paper substrate. The adhesive layer was provided so that S1 / S2 = 0.31, where S1 is the area of ​​the adhesive layer in a plan view and S2 is the area of ​​the substrate.

[0051] Thereafter, as in the first embodiment described above, the prepared adhesive label was attached to the insulated container, and then heated using a microwave oven, and the temperatures of the container and the adhesive label after heating were measured. Then, as in the first embodiment described above, the heat insulating properties of the adhesive label were evaluated. The results are shown in Table 1.

[0052] Example 3 An adhesive label with an air layer (thickness T: 15 μm) as shown in Figures 4 and 5 was produced in the same manner as in Example 2, except that an adhesive layer was provided on a pair of opposing ends in the longitudinal direction of the high-quality paper base material.

[0053] When the area of ​​the adhesive layer in plan view is S1 and the area of ​​the base material is S2, the adhesive layer was provided so that S1 / S2=0.4.

[0054] Thereafter, as in the first embodiment described above, the prepared adhesive label was attached to the insulated container, and then heated using a microwave oven, and the temperatures of the container and the adhesive label after heating were measured. Then, as in the first embodiment described above, the heat insulating properties of the adhesive label were evaluated. The results are shown in Table 1.

[0055] (Comparative Example 1) An acrylic adhesive layer was laminated on the surface of a release paper (high-quality tack paper), and then a layer of high-quality paper was laminated on the surface of the acrylic adhesive layer to produce an adhesive label (two-layer structure) with no air layer.

[0056] Thereafter, as in the first embodiment described above, the prepared adhesive label was attached to the insulated container, and then heated using a microwave oven, and the temperatures of the container and the adhesive label after heating were measured. Then, as in the first embodiment described above, the heat insulating properties of the adhesive label were evaluated. The results are shown in Table 1.

[0057] (Comparative Example 2) Two layers of acrylic adhesive layers and two layers of high-quality paper were alternately laminated on the surface of release paper (high-quality tack paper) to create an adhesive label (four-layer structure) with no air gap.

[0058] Thereafter, as in the first embodiment described above, the prepared adhesive label was attached to the insulated container, and then heated using a microwave oven, and the temperatures of the container and the adhesive label after heating were measured. Then, as in the first embodiment described above, the heat insulating properties of the adhesive label were evaluated. The results are shown in Table 1.

[0059] [Table 1]

[0060] As shown in Table 1, in Examples 1 to 3 in which an air layer is provided, the heat insulating properties of the adhesive labels are dramatically improved compared to Comparative Examples 1 and 2 in which an air layer is not provided, and it is clear that the adhesive label attached to the insulated container after heating can be touched for a long time (10 seconds or more).

[0061] In addition, in Comparative Example 2, two layers of high-quality paper are used, and the temperature difference between the container and the adhesive label after heating is large (86°C - 76°C = 10°C), but since there is no air layer, it can be seen that the adhesive label can only be touched for a moment after heating. [Industrial Applicability]

[0062] As explained above, the present invention is particularly useful for adhesive labels used on insulated containers. [Explanation of symbols]

[0063] 1 adhesive label 2 Base material 3 Adhesive layer 4 Release paper 5~7 air layer 8. Insulated containers 10 adhesive labels 20 adhesive labels S1 Area of ​​adhesive layer in plan view S2 Planar surface area of ​​the substrate T Air layer thickness

Claims

1. An adhesive label having a plurality of adhesive layers and a plurality of substrates alternately laminated on a surface of a release paper, the adhesive label being attached to an insulated container to be heated in a microwave oven, An adhesive label characterized in that an air layer is provided in advance in the areas between adjacent substrates with the adhesive layer interposed therebetween, and between the substrate and the release paper adjacent to each other with the adhesive layer interposed therebetween, where the adhesive layer is not provided, and therefore the label does not shrink due to heat.

2. 2. The adhesive label according to claim 1, wherein the adhesive layer is two-layered and the substrate is two-layered.

3. 2. The adhesive label according to claim 1, wherein the adhesive layer has three layers, and the substrate has three layers.

4. The adhesive label according to any one of claims 1 to 3, wherein the thickness of the air layer is 5 to 50 µm.

5. 5. The adhesive label according to claim 1, wherein the adhesive layer is provided on a pair of opposing end portions of the substrate in a plan view.

6. In a plan view, the area of ​​the adhesive layer is S １ , the area of ​​the substrate is S ２ In this case, 0.15≦S １ / S ２ The adhesive label according to any one of claims 1 to 5, wherein a relationship of ≦0.75 is established.

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