JP7557412B2 - Tear-off Label - Google Patents

Description

The present invention relates to a tear-off label.

A prior document disclosing the configuration of a microwave-tearable label is Japanese Patent Publication No. 5621127 (Patent Document 1). The tearable label described in Patent Document 1 is attached to the covering film of a package. The tearable label has a label base material on which a conductive layer is laminated, and an adhesive layer provided on the back surface of the label base material. The label base material has a roughly bow-tie shape in plan. A slit portion is formed by cutting in the thickness direction across the entire layer of the label within the area where the adhesive layer is provided. The slit portion has a linear shape with ends in plan.

Patent No. 5621127

In the tear-off label described in Patent Document 1, microwave irradiation ensures that the applied film is cut along the shape of the slit, while there is room to lengthen the total length of the cut. By lengthening the total length of the cut, steam generated within the applied film can be reliably released to the outside.

The present invention has been made to solve the above problems, and aims to provide a tear-off label that can reliably cut the attached film along the shape of the tearing portion by irradiating microwaves, while also lengthening the total length of the cut.

The breakable label according to the present invention is attached to the covering film of the microwave processing package. The breakable label includes a main layer and an adhesive layer. The adhesive layer is laminated on one side of the main layer. The main layer includes a base layer and a conductor layer laminated to each other in the lamination direction with the adhesive layer. The conductor layer has a first edge, a second edge, a plurality of constrictions, and a plurality of breaks. The first edge extends along a length direction perpendicular to the lamination direction when viewed from the lamination direction. The second edge extends along the length direction while being spaced from the first edge in a width direction perpendicular to the length direction when viewed from the lamination direction. Each of the plurality of constrictions is sandwiched between the first edge and the second edge. In each of the plurality of constrictions, the gap between the first edge and the second edge is narrow. Each of the plurality of breaks penetrates the conductor layer in the lamination direction. At least one of the plurality of breakage portions is provided in each of at least a portion of the plurality of constricted portions. Each of the plurality of breakage portions divides the constricted portion in which it is provided among the at least a portion of the constricted portions in the length direction.

In one embodiment of the present invention, each of the multiple breaks extends linearly in the width direction.

In one embodiment of the present invention, in each of at least some of the constricted portions, the first edge has one curved portion that is convexly curved toward the second edge, and the second edge has another curved portion that is convexly curved toward the first edge.

In one embodiment of the present invention, in each of at least some of the narrowed portions, the shortest direction connecting one curved portion to the other curved portion is parallel to the width direction.

According to the present invention, microwave irradiation can be used to reliably cut the attached film along the shape of the break, while also lengthening the total length of the cut.

1 is a perspective view showing a configuration of a package for microwave treatment according to one embodiment of the present invention; 1 is a plan view showing a configuration of a tear-off label according to an embodiment of the present invention. 3 is a cross-sectional view of the tear-off label of FIG. 2 as seen from the direction of the arrows III-III. FIG. 11 is a plan view showing a tear-off label according to a first modified example of an embodiment of the present invention. FIG. 13 is a plan view showing a tear-off label according to a second modified example of an embodiment of the present invention. FIG. 13 is a plan view showing a tear-off label according to a third modified example of an embodiment of the present invention. FIG. 13 is a plan view showing a tear-off label according to a fourth modified example of an embodiment of the present invention. FIG. 13 is a plan view showing a tear-off label according to a fifth modified example of an embodiment of the present invention. FIG. 13 is a plan view showing a tear-off label according to a sixth modified example of an embodiment of the present invention. FIG. 13 is a plan view showing a tear-off label according to a seventh modified example of an embodiment of the present invention.

The following describes a tear-off label according to one embodiment of the present invention with reference to the drawings. In the following description of the embodiment, the same or corresponding parts in the drawings are given the same reference numerals, and the description thereof will not be repeated. In the drawings, the length direction of the tear-off label is the X-axis direction, the width direction of the tear-off label is the Y-axis direction, and the thickness direction of the tear-off label is the Z-axis direction.

Figure 1 is a perspective view showing the configuration of a package for microwave treatment according to one embodiment of the present invention. Figure 2 is a plan view showing the configuration of a breakable label according to one embodiment of the present invention. Figure 3 is a cross-sectional view of the breakable label of Figure 2 as seen from the direction of the arrow III-III.

As shown in FIG. 1, a microwave processing package 1 according to one embodiment of the present invention comprises a container 2, an adhesive film 3, and a tear-off label 10. As shown in FIG. 2 and FIG. 3, the tear-off label 10 according to one embodiment of the present invention comprises a main body layer 11 and an adhesive layer 12.

As shown in FIG. 1, the microwave processing package 1 is a package that contains a packaged item (not shown), such as a microwave food product, to be processed by microwave irradiation. The packaged item is heated by irradiating the microwave processing package 1 with microwaves.

Container 2 contains the packaged item. Container 2 is made of a synthetic resin such as polypropylene (PP). Covering film 3 seals the opening at the top of container 2, and container 2 and covering film 3 together seal the packaged item.

The coating film 3 is a single resin film or a laminated film in which multiple resin films are laminated together. The coating film 3 is preferably a resin film that does not have heat shrinkability, but may also be a resin film such as a heat shrinkable film or a self-stretchable film. The thickness of the coating film 3 is, for example, 30 μm or more and 90 μm or less, and is 50 μm in this embodiment.

The break label 10 is attached to the outside of the covering film 3 of the microwave processing package 1. In this embodiment, one break label 10 is attached to the covering film 3, but the number of break labels 10 attached to the covering film 3 is not limited to one, and may be multiple.

As shown in FIG. 2, the length 10W of the tear-tear label 10 in the X-axis direction is, for example, 20 mm or more and 60 mm or less, and in this embodiment, it is 45 mm. The width 10L of the tear-tear label 10 in the Y-axis direction is, for example, 10 mm or more and 40 mm or less, and in this embodiment, it is 20 mm.

As shown in FIG. 3, the main body layer 11 includes a base layer 100 and a conductor layer 110 laminated together in the lamination direction with the adhesive layer 12. As shown in FIG. 2, in this embodiment, the base layer 100 and the conductor layer 110 of the main body layer 11 have the same outer shape as each other when viewed from the lamination direction (Z-axis direction) of the main body layer 11 and the adhesive layer 12.

The main body layer 11 is not limited to a two-layer structure of the base layer 100 and the conductive layer 110, and may have a light-shielding layer on the outermost surface opposite the cladding film 3, taking into consideration the amount of sparks generated in the tear-off label 10 when microwaves are irradiated. Also, a resin laminate layer such as polyethylene terephthalate (PET) may be provided on the outermost surface opposite the cladding film 3, taking into consideration the aesthetic appearance of the microwave processing package 1 after microwave irradiation.

As shown in FIG. 3, the adhesive layer 12 is laminated on one side of the main layer 11. Specifically, in this embodiment, the adhesive layer 12 is laminated adjacent to the conductor layer 110 on the opposite side of the base layer 100 in the lamination direction (Z-axis direction) of the main layer 11 and the adhesive layer 12. The adhesive layer 12 is laminated over the entire surface of one side of the conductor layer 110 in the lamination direction of the conductor layer 110.

The adhesive layer 12 preferably has an adhesiveness that allows it to stick to the deposition film 3 at room temperature and that adhesiveness lasts for a long time. Examples of materials that constitute the adhesive layer 12 include acrylic resins, rubber resins, silicone resins, and urethane resins. The thickness of the adhesive layer 12 in the Z-axis direction is, for example, 10 μm or more and 30 μm or less.

As shown in Figures 2 and 3, the base layer 100 in the main body layer 11 has a film shape. The thickness of the base layer 100 in the Z-axis direction is, for example, 10 μm or more and 100 μm or less.

The base layer 100 is, for example, a resin film such as PP or PET. The base layer 100 may also be a resin film, synthetic paper, or a multi-layer film formed by laminating multiple layers made of different materials.

The conductive layer 110 has a film shape. The thickness (Z-axis direction) of the conductive layer 110 is, for example, at least 0.005 μm as a lower limit, preferably at least 0.01 μm, more preferably at least 0.015 μm, and even more preferably at least 0.04 μm, and at most 30 μm as an upper limit, preferably at most 20 μm, more preferably at most 10 μm, and even more preferably at most 1 μm, and most preferably at most 0.08 μm.

The conductive layer 110 is, for example, a metal such as aluminum, nickel, or chromium, an alloy, or a metal oxide. The conductive layer 110 may be provided on the base layer 100 by vapor deposition, or may be formed by adhering a foil-shaped conductive layer 110 to the base layer 100. The conductive layer 110 may be provided on the base layer 100 by applying ink containing the material that constitutes the conductive layer 110 onto the base layer 100 and curing it.

2 and 3, the conductive layer 110 has a first edge 111, a second edge 112, a plurality of constricted portions 120, and a plurality of broken portions 130. In this embodiment, the conductive layer 110 has two constricted portions 120 and two broken portions 130.

As shown in FIG. 2, the first edge 111 extends along a length direction (X-axis direction) perpendicular to the stacking direction when viewed from the stacking direction (Z-axis direction). Specifically, the first edge 111 extends in the X-axis direction while meandering in accordance with the multiple constrictions 120.

When viewed from the stacking direction (Z-axis direction), the second edge portion 112 extends along the length direction (X-axis direction) while being spaced apart from the first edge portion 111 in the width direction (Y-axis direction) perpendicular to the length direction. Specifically, the second edge portion 112 extends in the X-axis direction while meandering to match the multiple constrictions 120 while being spaced apart from the first edge portion 111 in the Y-axis direction.

Each of the multiple constrictions 120 is sandwiched between the first edge 111 and the second edge 112. In each of the multiple constrictions 120, the distance between the first edge 111 and the second edge 112 is narrow. In this embodiment, the multiple constrictions 120 are portions of the breakable label 10 including the conductive layer 110 that are narrow in width in the Y-axis direction. In the breakable label 10 of one embodiment of the present invention, the base layer 100 also has multiple constrictions 120, but it is sufficient that at least the conductive layer 110 has multiple constrictions 120.

The width 120L of each of the multiple constricted portions 120 in the Y-axis direction is, for example, 4 mm or more and 20 mm or less, and is 8 mm in this embodiment. In this embodiment, each of the multiple constricted portions 120 has a shape that is linearly symmetrical with respect to a virtual central axis that passes through the center position of the width 10L in the Y-axis direction and extends in the X-axis direction, but is not limited to this shape and may be asymmetric with respect to the virtual central axis. For example, one of the first edge portion 111 and the second edge portion 112 may extend in the X-axis direction while meandering, and the other of the first edge portion 111 and the second edge portion 112 may extend parallel to the X-axis direction. In addition, each of the multiple constricted portions 120 may have a different shape from each other.

In this embodiment, in each of the multiple constricted portions 120, the first edge portion 111 has one curved portion 111a that is curved convexly toward the second edge portion 112, and the second edge portion 112 has the other curved portion 112a that is curved convexly toward the first edge portion 111. Note that in all of the constricted portions 120, each of the first edge portion 111 and the second edge portion 112 does not necessarily have to have a curved portion, and it is sufficient that in the constricted portion 120 in which the break portion 130 is provided, each of the first edge portion 111 and the second edge portion 112 has a curved portion.

If each of the first edge 111 and the second edge 112 is bent, sparks may occur at the bent corners of each of the first edge 111 and the second edge 112 when microwaves are applied. By each of the first edge 111 and the second edge 112 being curved, it is possible to prevent sparks from occurring at the curved parts of each of the first edge 111 and the second edge 112 when microwaves are applied. Similar to the shape of each of the first edge 111 and the second edge 112, all corners of the external shape of the tear-away label 10 in the XY plane have a curved shape.

As described below, in at least some of the constricted portions 120 in which multiple breakage portions 130 are provided, the shortest direction connecting one curved portion 111a and the other curved portion 112a is parallel to the width direction (Y-axis direction). In this embodiment, in each of the two constricted portions 120, the shortest direction connecting one curved portion 111a and the other curved portion 112a is parallel to the Y-axis direction.

2 and 3, the plurality of breaks 130 penetrate the conductor layer 110 in the stacking direction (Z-axis direction). In this embodiment, the plurality of breaks 130 are provided in the conductor layer 110, but they may penetrate not only the conductor layer 110 but also at least one of the base layer 100 and the adhesive layer 12 on the same line in the Z-axis direction. For example, when the conductor layer 110 is provided on the base layer 100 by vapor deposition, the plurality of breaks 130 are provided by forming a defective portion of the conductor layer 110 by masking a part of the base layer 100. In this embodiment, the breaks 130 are slit holes, but are not limited to slit holes and may be cracks that obstruct the flow of electrons in the conductor layer 110 when microwaves are irradiated. The cracks can be formed, for example, by embossing.

In this embodiment, as shown in FIG. 2, the multiple breakage portions 130 are provided in one-to-one correspondence with at least some of the multiple constriction portions 120. Two breakage portions 130 are provided for each of the two constriction portions 120. Note that there may be a constriction portion 120 that is not provided with a breakage portion 130. Also, there may be a constriction portion 120 that is provided with multiple breakage portions 130. That is, at least one of the multiple breakage portions 130 is provided for each of at least some of the multiple constriction portions 120. Note that there may be a breakage portion provided in a portion other than the constriction portion 120.

Each of the multiple breaks 130 extends linearly in the width direction (Y-axis direction). The horizontal width 130W in the X-axis direction of each of the multiple breaks 130 is, for example, 1.0 mm or less, preferably 0.5 mm or less, and more preferably 0.2 mm or less. The vertical width 130L in the Y-axis direction of each of the multiple breaks 130 is, for example, 2 mm or more and 6 mm or less, and is 4 mm in this embodiment.

Each of the multiple breaks 130 divides the constricted portion 120 in which the breaks 130 are provided in the length direction (X-axis direction) while being spaced apart from each of the first edge portion 111 and the second edge portion 112. Specifically, the vertical width 130L of the breaks 130 is narrower than the width 120L of the constricted portion 120, and the breaks 130 are spaced apart from each of the first edge portion 111 and the second edge portion 112. In this way, the breaks 130 divide the portion of the constricted portion 120 in the X-axis direction excluding both ends in the Y-axis direction.

In this embodiment, each of the multiple breakage parts 130 is a slit hole, so that it is spaced apart from each of the first edge part 111 and the second edge part 112, but this configuration is not limited to this. If each of the multiple breakage parts 130 is a crack, at least some of the multiple breakage parts 130 may be continuously provided from one curved part 111a to the other curved part 112a, so that they run vertically through the conductor layer 110. In this case, since the base layer 100 is not divided by a crack, the integrity of the breakage label 10 can be maintained even if the conductor layer 110 is completely divided by a crack.

The break portion 130 in the Y-axis direction is, for example, 2 mm away from each of the first edge portion 111 and the second edge portion 112. Specifically, as shown in FIG. 2, the dimension of each of the distance L2 between the first edge portion 111 and the break portion 130 in the constricted portion 120 and the distance L2 between the second edge portion 112 and the break portion 130 is 2 mm. The dimension of the distance L2 is preferably 0.1 mm or more and 2 mm or less.

In the multiple breakages 130, the dimension of the distance L1 between adjacent breakages 130 in the length direction (X-axis direction) is 1/9 or more and 5/9 or less of the dimension of the length 10W of the conductive layer 110 in the length direction (X-axis direction). In this embodiment, the dimension of the distance L1 between adjacent breakages 130 in the X-axis direction is approximately 1/3 of the dimension of the length 10W of the conductive layer 110 in the X-axis direction. Since the dimension of the distance L1 is 1/9 or more and 5/9 or less of the dimension of the length 10W, the conductive layer 110 that serves as a source of electrons is secured between adjacent breakages 130 and on both outsides of the breakages 130, and a sufficient amount of electrons can be collected at the breakages 130 during microwave irradiation to generate sparks. As a result, the deposition film 3 can be effectively melted by the heat generated by the sparks.

The following describes the action of the breakable label 10 according to one embodiment of the present invention when irradiated with microwaves.

When the tear-away label 10 is exposed to microwaves, eddy currents are generated in the conductive layer 110. The generated eddy currents are concentrated at positions along the constricted portion 120 and the broken portion 130 due to the so-called edge runaway phenomenon, which is concentrated at the severed tip of the conductive layer 110.

As shown in FIG. 2, the width 120L of the constricted portion 120 is narrower than the width 10L of the tear-off label 10 in the Y-axis direction, so the density of electrons is high in the constricted portion 120. Therefore, high-density electrons are concentrated in the position between the first edge 111 and the tearing portion 130 and in the position between the second edge 112 and the tearing portion 130 in the constricted portion 120.

In the conductive layer 110 at the position between the first edge 111 and the break 130 and at the position between the second edge 112 and the break 130 in the constricted portion 120, the electron flow area is narrow, so concentrated high-density electrons cannot flow, and as a result, discharge occurs between the end faces of the conductive layer 110 facing each other through the break 130 in the X-axis direction, generating a spark. The heat generated by this spark is transferred from the tear label 10 to the deposition film 3, melting the portion of the deposition film 3 along the break 130. As the deposition film 3 melts and a cut is formed, steam generated from the packaged item heated by microwaves is discharged from the inside of the microwave processing package 1 to the outside through the cut in the deposition film 3.

Even if the fractured portion 130 is a crack, sparks are generated by discharge between the end faces of the conductive layers 110 facing each other through the fractured portion 130, which is a crack, in the X-axis direction, just as in the case of the present embodiment where the fractured portion 130 is a slit hole.

In this embodiment, the breakable label 10 has multiple constricted portions 120 with breakable portions 130, so that the total length of the cut in the adherend film 3 can be increased, and as a result, steam generated within the adherend film 3 can be reliably released to the outside. As a result, the breakable label 10 has high steam discharge performance compared to a so-called approximately bow-tie type breakable label that has only one constricted portion with a breakable portion 130.

The cuts made in the coating film 3 are not limited to those intended for the purpose of discharging steam from inside the microwave processing package 1, but may also be used as openings for opening the coating film 3.

In addition, if the width 120L of the constricted portion 120 is narrowed even slightly from the width 10L of the tear-away label 10 in the Y-axis direction, electrons will be more likely to concentrate in the constricted portion 120, and the effect of causing sparks by microwave irradiation will be greater than with a rectangular tear-away label.

The tear-away label 10 according to one embodiment of the present invention has multiple constricted portions 120 with tear sections 130, so that when microwaves are irradiated, high-density electrons can be concentrated in the constricted portions 120 to generate sparks at the tear sections 130, thereby ensuring that the adherend film 3 is cut along the shape of the tear sections 130 while increasing the total length of the cut.

In the tear-away label 10 according to one embodiment of the present invention, the tear section 130 extends linearly in the width direction (Y-axis direction), so that sparks can be generated uniformly over the entire length of the tear section 130 in the Y-axis direction. This allows the total length of the tear to be increased while ensuring that the cut is made in the covering film 3 along the shape of the tear section 130.

In the tear-away label 10 according to one embodiment of the present invention, in the constricted portion 120, the first edge 111 has one curved portion 111a that is curved convexly toward the second edge 112, and the second edge 112 has the other curved portion 112a that is curved convexly toward the first edge 111, thereby making it possible to prevent sparks from occurring at the one curved portion 111a and the other curved portion 112a when microwaves are irradiated.

In the tear-away label 10 according to one embodiment of the present invention, the shortest direction connecting one curved portion 111a and the other curved portion 112a in the constricted portion 120 is parallel to the width direction (Y-axis direction), so that the gap between the first edge portion 111 and the second edge portion 112 can be narrowed around the tear portion 130 compared to when the shortest connecting direction is not parallel to the Y-axis direction. This makes it possible to concentrate electrons at the tear portion 130 during microwave irradiation and generate sparks. As a result, the applied film 3 can be effectively melted by the heat generated by the sparks.

Below, we will explain modified examples of the breakable label according to one embodiment of the present invention. The breakable labels according to the following modified examples differ from the breakable label 10 according to one embodiment of the present invention in the configuration of the first edge, second edge, constriction, and breakable portion, so we will not repeat the description of the configuration that is similar to the breakable label 10 according to one embodiment of the present invention.

Figure 4 is a plan view showing a tear-away label according to a first modified example of an embodiment of the present invention. As shown in Figure 4, in the tear-away label 10A according to the first modified example of an embodiment of the present invention, the dimension of the distance L1 between adjacent tear portions 130 is approximately 1/9 the dimension of the length 10W of the tear-away label 10.

Even if the dimension of the distance L1 between adjacent break portions 130 is reduced to approximately one-ninth the dimension of the length 10W of the break label 10, the conductive layer 110 that serves as a supply source of electrons is secured between the adjacent break portions 130, and a sufficient amount of electrons can be collected at the break portions 130 during microwave irradiation to generate sparks. As a result, the applied film 3 can be effectively melted by the heat generated by the sparks.

In the tear-away label 10A according to a first modified example of an embodiment of the present invention, each of the two constricted portions 120 has a shape that is linearly symmetrical with respect to an imaginary central axis that passes through the center position of the width 10L in the Y-axis direction and extends in the X-axis direction. The two constricted portions 120 have a shape that is linearly symmetrical with respect to an imaginary central axis that passes through the center position of the tear-away label 10 in the X-axis direction and extends in the Y-axis direction.

As shown in FIG. 4, the angle between the constriction center line B, which passes through the center of the constriction portion 120 and extends in the Y-axis direction, and the portion of the first edge portion 111 located between the constriction portions 120 is A1. The angle between the constriction center line B and the portion of the first edge portion 111 located outside the constriction portions 120 is A2. In this modified example, since A2>A1, the distance between adjacent constriction portions 120 in the X-axis direction is shorter than one-third of the length 10W of the tear-tear label 10. As a result, the distance L1 between adjacent tear portions 130 is also shorter than one-third of the length 10W of the tear-tear label 10. Note that the angle A1 and the angle A2 are not limited to the relationship A2>A1, and may satisfy the relationship A2=A1 as in this embodiment.

The breakage portion 130 does not necessarily have to be located on the constriction center line B, but may be located within a range of ±5 mm in the X-axis direction from the constriction center line B. By locating the breakage portion 130 within this range, high-density electrons can be concentrated on the constriction portion 120 during microwave irradiation, causing sparks to be generated at the breakage portion 130.

Figure 5 is a plan view showing a tear-away label according to a second modified example of an embodiment of the present invention. As shown in Figure 5, in the tear-away label 10B according to the second modified example of an embodiment of the present invention, the maximum width 13L in the Y-axis direction between the tear portions 130 is narrower than the width 10L at both ends in the X-axis direction, and is wider than the width 120L in the Y-axis direction of the constricted portion 120.

Figure 6 is a plan view showing a break label according to a third modified example of an embodiment of the present invention. As shown in Figure 6, in the break label 10C according to the third modified example of an embodiment of the present invention, the first edge 111 and the second edge 112 each extend parallel to the X-axis direction within a range of length L3 at both ends of the break label 10C in the X-axis direction.

Figure 7 is a plan view showing a break label according to a fourth modified example of an embodiment of the present invention. As shown in Figure 7, in the break label 10D according to the fourth modified example of an embodiment of the present invention, the first edge 111 and the second edge 112 each extend parallel to the X-axis direction within a range of length L4 between the constricted portions 120.

Figure 8 is a plan view showing a break label according to a fifth modified example of an embodiment of the present invention. As shown in Figure 8, in the break label 10E according to the fifth modified example of an embodiment of the present invention, the second edge 112 extends parallel to the X-axis direction.

Figure 9 is a plan view showing a tear-away label according to a sixth modified example of an embodiment of the present invention. As shown in Figure 9, in the tear-away label 10F according to the sixth modified example of an embodiment of the present invention, one curved portion 111a and the other curved portion 112a are positioned offset from each other in the X-axis direction. The tearing portion 130 extends in a direction that connects the one curved portion 111a and the other curved portion 112a in the shortest possible direction, and is positioned diagonally with respect to the Y-axis direction. In this modified example, the length of the tearing portion 130 can be increased, and therefore the total length in which the cut is made can be increased.

Figure 10 is a plan view showing a tear-away label according to a seventh variation of an embodiment of the present invention. As shown in Figure 10, the tear-away label 10G according to the seventh variation of an embodiment of the present invention has three constricted portions 120. One tear-away portion 130 is provided in each of the three constricted portions 120.

The above disclosed embodiments are illustrative in all respects and are not intended to be a basis for restrictive interpretation. Therefore, the technical scope of this disclosure should not be interpreted solely by the above-described embodiments. Furthermore, all modifications within the meaning and scope equivalent to the claims are included. In the above description of the embodiments, configurations that can be combined may be combined with each other.

1 Microwave processing package, 2 Container, 3 Adhesive film, 10, 10A, 10B, 10C, 10D, 10E, 10F, 10G Tearable label, 11 Main body layer, 12 Adhesive layer, 100 Base layer, 110 Conductor layer, 111 First edge, 111a One curved portion, 112 Second edge, 112a The other curved portion, 120 Neck portion, 130 Tear portion.

Claims (4)

A tear-off label attached to an adhesive film of a package for microwave treatment, comprising:
A main body layer;
an adhesive layer laminated on one side of the main body layer,
the main body layer includes a base material layer and a conductor layer laminated together in a lamination direction with the adhesive layer,
The conductive layer is
A first edge portion extending along a length direction perpendicular to the stacking direction when viewed from the stacking direction;
A second edge portion extending along the longitudinal direction while being spaced apart from the first edge portion in a width direction perpendicular to the longitudinal direction when viewed from the stacking direction;
a plurality of constricted portions sandwiched between the first edge portion and the second edge portion, and a distance between the first edge portion and the second edge portion is narrowed;
a plurality of breakage portions penetrating the conductive layers in the stacking direction;
At least one of the plurality of breakable portions is provided in each of at least some of the plurality of constricted portions,
A tear-away label, wherein each of the plurality of tear portions divides a constricted portion among at least some of the constricted portions in the longitudinal direction. The tear-away label according to claim 1, wherein each of the plurality of tear sections extends linearly in the width direction. A breakable label according to claim 1 or claim 2, wherein in each of at least some of the constricted portions, the first edge has one curved portion that is convexly curved toward the second edge, and the second edge has another curved portion that is convexly curved toward the first edge. The breakable label according to claim 3 , wherein in each of the at least some of the constricted portions, a direction connecting the one curved portion and the other curved portion at the shortest distance is parallel to the width direction.

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