Package

Abstract

To provide a package which can be carried without leakage of a content after the content is heated in a microwave oven.SOLUTION: In a package 1, a label 40 is peeled off from a lid material 30 so as to remain partially attached before a content C is heated, exposes a steam ventilation hole 34, keeps an exposed state of the steam ventilation hole 34 while the contents C is being heated, and can be reattached to the lid material 30 after the content C is heated. When the label 40 is peeled off before the content C is heated, the label 40 is peeled off from one longitudinal end part 40b on a base end part 35a side of a tongue piece 35 formed in a cantilever state from the base end part 35a in an inside region of the steam ventilation hole 34, so that the base end part 40a on the other longitudinal end part 40c side of the label 40 remains attached. The label 40 comprises an innermost layer 41 attached to the lid material 30, an intermediate layer 42 laminated to the innermost layer 41, and an outermost layer 43 composed of a heat shrinkable film. The thickness of the heat shrinkable film is 12 μm to 30 μm.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a package.

Background Art

[0002] Conventionally, there has been known a package configured to automatically discharge water vapor generated by heating when the pressure in the accommodation space increases by heating the contents in a microwave oven. For example, Patent Document 1 discloses a lid material used for heat-sealing an opening of a container body by heat-sealing a flange portion of the container body, the lid material having a steam vent hole and a steam vent label for sealing the steam vent hole. The steam vent hole label of this lid material is a first layer that is the outermost layer made of a heat-shrinkable film, a second layer made of a film having no heat-shrinkability, and an adhesive layer. The adhesive layer that adheres the first layer and the second layer has one or more strip-shaped non-adhesive portions, and the strip-shaped non-adhesive portions are orthogonal to the heat-shrinkage direction of the first layer.

[0003] According to the lid material shown in Patent Document 1, when the package is heated in a microwave oven, the heat-shrinkable film shrinks due to the temperature of the generated water vapor, and the steam vent label warps upward, thereby opening the steam vent hole and automatically discharging the water vapor.

[0004] Further, Patent Document 2 discloses a labeled container having a container provided with an opening for discharging steam and a ventilation label attached so as to cover the opening, the ventilation label being capable of forming a ventilation port through which steam discharged from the opening passes and having a variable display portion including a temperature indicating ink portion whose color development state changes in a predetermined temperature range. According to the labeled container shown in Patent Document 2, since the ventilation label can form a ventilation port, steam can be discharged when the contents are heated while closing the opening of the container for microwave treatment.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0006] However, in the lid material shown in Patent Document 1 and the labeled container shown in Patent Document 2, there are the following problems. That is, in the case of the lid material shown in Patent Document 1, after heating the package in a microwave oven, the steam vent hole remains open. For this reason, when carrying the package containing the contents, for example, when taking out the package from a store, there is a risk that the contents will leak out through the steam vent hole.

[0007] Also, in the case of the labeled container shown in Patent Document 2, after heating the labeled container in a microwave oven, although the opening of the microwave treatment container is covered with a steam-permeable label, the steam vent formed in the steam-permeable label remains open. For this reason, similar to the lid material shown in Patent Document 1, when carrying the labeled container containing the contents, there is a risk that the contents will leak out through the steam vent.

[0008] Therefore, the present invention has been made to solve this conventional problem, and an object thereof is to provide a package that can be carried without the contents leaking out after heating the contents in a microwave oven.

Means for Solving the Problems

[0009] In order to solve the above problems, a package according to one aspect of the present invention is a package for containing contents to be heated in a microwave oven, comprising a container having a storage space for containing the contents, and a lid attached to the container. The lid is attached to the container so as to close the storage space, and includes a lid material formed with a steam vent for discharging steam generated by heating, and a label adhered to the lid material so as to close the steam vent. Before heating the contents, the label is peeled off so that a partially adhered state remains from the lid material to expose the steam vent, and when heating the contents, the steam vent is maintained in an exposed state. After heating the contents, the label can be re-adhered to the lid material so as to cover the steam vent. When peeling off the label before heating the contents, the label is peeled off from one end in the longitudinal direction on the base end side of a tongue piece formed in a cantilever shape from the base end in the region inside the steam vent, and the adhered state of the base end on the other end side in the longitudinal direction of the label is left. The label includes an innermost layer composed of an adhesive layer adhered to the lid material, an intermediate layer laminated on the innermost layer, and an outermost layer laminated on the intermediate layer and composed of a heat-shrinkable film. The thickness of the heat-shrinkable film constituting the outermost layer is in the range of 12 μm to 30 μm.

[0010] According to this package, by re-adhering the label to the lid material so as to cover the steam vent after heating the contents, the steam vent can be sealed, and the contents can be carried without leaking from the steam vent. Also, since the label maintains the steam vent in an exposed state when heating the contents, steam can be vented through the steam vent. If the label blocks the steam vent when heating the contents, the steam may vent through other locations, for example, the attachment portion (sealing portion) between the lid material and the container, and the contents may leak from that attachment portion when carrying after heating.

[0011] Also, in this package, the label includes an innermost layer composed of an adhesive layer adhered to the lid material, an intermediate layer laminated on the innermost layer, and an outermost layer laminated on the intermediate layer and composed of a heat-shrinkable film. According to this package, since the label has an outermost layer made of a heat-shrinkable film, when heating the contents, the heat-shrinkable film shrinks outward around the part where it is partially adhered to the lid material due to the temperature of the water vapor generated, causing the label to warp and maintaining a state where the steam vent is exposed. And because this heat-shrinkable film is arranged in the outermost layer of the label, there is no layer-like object that inhibits the shrinkage when the heat-shrinkable film shrinks outward, and the label can warp easily and smoothly and maintain a state where the steam vent is exposed.

[0012] Also, in this package, it is preferable that the heat shrinkage rate of the heat-shrinkable film constituting the outermost layer is 5% to 50% both in the MD and TD directions when heated at 100°C for 30 minutes. According to this package, when heating the contents, it is possible to avoid the risk that the label does not warp and blocks the steam vent, or that the amount of warping of the label is extremely large and it cannot be reattached. If the heat shrinkage rate of the heat-shrinkable film is less than 5%, there is a risk that the label will not warp and block the steam vent. On the other hand, if the heat shrinkage rate of the heat-shrinkable film is greater than 50%, there is a risk that the amount of warping of the label is too large to be reattached to the lid material.

[0013] Also, in this package, the thickness of the heat-shrinkable film constituting the outermost layer is 12 μm to 30 μm. According to this package, when heating the contents, it is possible to avoid the risk that the label does not warp and blocks the steam vent, or that the amount of warping of the label is extremely large and it cannot be reattached. If the thickness of the heat-shrinkable film is thicker than 30 μm, there is a risk that the label will not warp and block the steam vent. On the other hand, if the thickness of the heat-shrinkable film is thinner than 12 μm, there is a risk that the amount of warping of the label is too large to be reattached to the lid material.

Advantages of the Invention

[0014] According to the package of the present invention, it is possible to provide a package that can be carried without the contents leaking out after heating the contents in a microwave oven.

Brief Description of the Drawings

[0015]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Modes for Carrying Out the Invention

[0016] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Note that each drawing is schematic and may differ from reality. Further, the following embodiments illustrate devices and methods for embodying the technical idea of the present invention and do not specify the configuration to the following. That is, various changes can be made to the technical idea of the present invention within the technical scope described in the claims.

[0017] (First Embodiment) FIG. 1 shows a state of the package according to the first embodiment of the present invention before heating the contents. The package 1 shown in FIG. 1 accommodates the contents C to be heated in a microwave oven and discharges the water vapor X (see FIGS. 4 and 5) generated from the contents C. The contents C are an object to be heated that generates water vapor when heated in a microwave oven, and are, for example, food.

[0018] This package 1 includes a container 10 having a storage space 12 for accommodating the contents C and a lid 20 attached to the container 10. The container 10 includes a rectangular parallelepiped container body 11 having an open upper surface with a storage space 12 for accommodating the contents C and a flange portion 13 provided at the upper edge of the container body 11. The material of the container 10 is, for example, polypropylene with filler.

[0019] As shown in FIG. 1, the lid 20 is attached to the container 10 so as to close the storage space 12. As shown in FIG. 1, the lid 20 is attached to the container 10 so as to close the storage space 12, and includes a lid material 30 having a steam vent 34 for discharging the water vapor generated by heating, and a label 40 attached to the lid material 30 so as to close the steam vent 34. The lid material 30 is formed in a rectangular flat plate shape having a predetermined plate thickness with a narrow width in the vertical direction (the vertical direction in FIG. 1) and a long length in the horizontal direction (the horizontal direction in FIG. 1), and is heat-sealed to the flange portion 13 provided on the container body 11 to close the opening of the container body 11 and close the storage space 12.

[0020] As shown in FIG. 1, the lid material 30 includes an innermost layer 31 heat-sealed to the flange portion 13, an intermediate layer 32 laminated on the innermost layer 31, and an outermost layer 33 laminated on the intermediate layer 32. An easy-peel sealant is used as the innermost layer 31. As the intermediate layer 32, a stretched base material such as a stretched polypropylene film (OPP), a stretched polyethylene terephthalate film (PET), a stretched nylon film (ONy), etc. is used. Further, as the outermost layer 33, a transparent stretched base material such as transparent vapor-deposited PET is used.

[0021] Although not shown in the figure, a gas barrier layer is provided between the innermost layer 31 and the intermediate layer 32 and between the outermost layer 33 and the intermediate layer 32. As shown in FIG. 1, the steam vent 34 is formed at a substantially central portion of the lid material 30 and is formed by a single cut line in a horizontal U shape. By forming the steam vent 34 in a horizontal U shape in the lid material 30, a tongue piece 35 extending horizontally in a cantilever shape from the base end portion 35a is formed in the region inside the steam vent 34.

[0022] Further, as shown in FIG. 1, the label 40 is formed in a rectangular flat plate shape having a predetermined plate thickness and is adhered to the lid material 30 so as to close the steam vent 34 with its longitudinal direction being the horizontal direction. As shown in FIGS. 2 and 3, this label 40 is peeled off so that a partially adhered state remains from the lid material 30 before heating the contents C to expose the steam vent 34. Here, when peeling off the label 40, as shown in FIGS. 2 and 3, it is peeled off from one longitudinal end portion 40b on the base end portion 35a side of the tongue piece 35 formed on the lid material 30 of the label 40 so that the adhered state of the base end portion 40a on the other longitudinal end portion 40c side of the label 40 remains. Thereby, as shown in FIG. 3, while the tongue piece 35 rotates upward slightly in the outward direction (upward direction) around the base end portion 35a, the steam vent 34 is exposed.

[0023] In this way, by peeling off the label 40 from the lid material 30 so that the adhered state of the base end portion 40a remains, when re-adhering the label 40 described later, it can be re-adhered to an accurate position that can firmly close the steam vent 34. By peeling the label 40 from one longitudinal end 40b on the proximal end 35a side of the tongue piece 35 formed on the lid material 30, it is possible to prevent the tongue piece 35 from being torn off from the lid material 30. When the label 40 is peeled from the other longitudinal end 40c side of the label 40, the tongue piece 35 may rotate too far outward (upward) about the proximal end 35a while remaining attached to the label 40, and there is a risk that the tongue piece 35 will be torn off from the lid material 30.

[0024] Also, as shown in FIGS. 4 and 5, the label 40 maintains a state in which the steam vent 34 is exposed when the content C is being heated. Thereby, when the content C is being heated, as shown in FIGS. 4 and 5, the water vapor X generated from the heated content C can vent through the steam vent 34. Here, if the label 40 blocks the steam vent 34 when the content C is being heated, the water vapor may vent through other locations, for example, the attachment portion (sealing portion) between the lid material 30 and the container 10, and the content C may leak out from that attachment portion when carrying it after heating.

[0025] Also, after heating the content C, the label 40 can be reattached to the lid material 30 so as to cover the steam vent 34, as shown in FIG. 6. When reattaching the label 40, it is reattached to the lid material 30 from the one longitudinal end 40b side opposite to the other longitudinal end 40c having the attached proximal end 40a. Thereby, the steam vent 34 can be sealed, and the package 1 can be carried without the content C leaking out from the steam vent 34.

[0026] Here, as shown in FIGS. 3 and 5, the label 40 includes an innermost layer 41 composed of an adhesive layer adhered to the lid material 30, an intermediate layer 42 laminated on the innermost layer 41, and an outermost layer 43 laminated on the intermediate layer 42 and composed of a heat-shrinkable film. As the adhesive layer constituting the innermost layer 41, for example, an acrylic adhesive layer is used. Further, as the intermediate layer 42, a film having no heat shrinkability, for example, a stretched base material such as a stretched polypropylene film (OPP), a stretched polyethylene terephthalate film (PET), or a stretched nylon film (ONy) is used.

[0027] Furthermore, as the heat-shrinkable film constituting the outermost layer 43, for example, a PET film having heat shrinkability is used. Thus, since the label 40 includes the outermost layer 43 that constitutes a heat-shrinkable film, as shown in FIG. 5, when the temperature of the water vapor X generated when heating the content C causes the heat-shrinkable film that constitutes the outermost layer 43 to shrink so as to warp outward (upward) about the base end portion 40a on the other end portion 40c side in the longitudinal direction of the label 40 where the adhered state remains, the label 40 warps, and the state in which the steam vent 34 is exposed can be maintained.

[0028] And since this heat-shrinkable film is disposed in the outermost layer 43 in the label, there is no layer-like material that inhibits the shrinkage when the heat-shrinkable film shrinks so as to warp outward, and the label 40 can warp easily and smoothly, and the state in which the steam vent 34 is exposed can be maintained. Here, the heat shrinkage rate of the heat-shrinkable film constituting the outermost layer 43 is 5% to 50% both in the MD and TD directions when heated at 100 ° C for 30 minutes. Thereby, when heating the content C, it is possible to avoid the possibility that the label 40 closes the steam vent 34 without warping, or that the amount of warping of the label 40 is so large that it cannot be reattached. If the heat shrinkage rate of the heat-shrinkable film is less than 5%, there is a possibility that the label 40 closes the steam vent 34 without warping. On the other hand, if the heat shrinkage rate of the heat-shrinkable film is greater than 50%, there is a possibility that the amount of warping of the label 40 is too large to be reattached to the lid member 30.

[0029] In addition, the thickness of the heat-shrinkable film forming the outermost layer 43 is 12 μm to 30 μm. As a result, when the contents C are being heated, it is possible to avoid the risk that the label 40 warps and closes the steam vent 34 without warping, or that the amount of warping of the label 40 is extremely large and it cannot be reattached. If the thickness of the heat-shrinkable film is greater than 30 μm, there is a risk that the label 40 will warp and close the steam vent 34 without warping. On the other hand, if the thickness of the heat-shrinkable film is less than 12 μm, there is a risk that the amount of warping of the label 40 will be too large to be reattached to the lid member 30.

[0030] In the package 1 configured as described above, when eating the contents C inside the package 1, first, as shown in FIGS. 2 and 3, before heating the contents C, the label 40 is peeled off from the lid member 30 from one end portion 40b in the longitudinal direction thereof so that the adhered state of the base end portion 40a remains, and the steam vent 34 is exposed. Next, the package 1 with the steam vent 34 exposed is placed in a microwave oven to heat the contents C. During this heating, as shown in FIGS. 4 and 5, the heat-shrinkable film forming the outermost layer 43 of the label 40 shrinks so as to warp outward (upward) around the base end portion 40a on the other end portion 40c side in the longitudinal direction of the label 40 where the adhered state remains, due to the temperature of the water vapor X generated when heating the contents C. As a result, the label 40 warps and maintains the state where the steam vent 34 is exposed.

[0031] As a result, the water vapor X generated from the heated contents C vents through the steam vent 34. Next, after the heating of the contents C by the microwave oven is completed, the package 1 is taken out of the microwave oven, and the label 40 is reattached to the lid member 30 from the one end portion 40b in the longitudinal direction opposite to the other end portion 40c in the longitudinal direction where the base end portion 40a to which it is adhered is located, as shown in FIG. 6, covering the steam vent 34. Next, after covering the steam vent 34 with the label 40, the package 1 is put into a my bag or the like and carried (taken out). At this time, since the steam vent 34 is covered with the label 40, the steam vent 34 is sealed, and the package 1 can be carried without the content C leaking from the steam vent 34. Thereafter, the lid 20 can be separated from the container 10, and the heated content C can be eaten.

[0032] Thus, according to the package 1 according to the first embodiment, the label 40 adhered so as to block the steam vent 34 formed in the lid material 30 is peeled off so that a partial adhered state remains from the lid material 30 before heating the content C to expose the steam vent 34, maintains the exposed state of the steam vent 34 when heating the content C, and can be re-adhered to the lid material 30 so as to cover the steam vent 34 after heating the content C.

[0033] Thereby, by re-adhering the label 40 to the lid material 30 so as to cover the steam vent 34 after heating the content C, the steam vent 34 can be sealed, and the package 1 can be carried without the content C leaking from the steam vent 34. Further, since the label 40 maintains the exposed state of the steam vent 34 when heating the content C, water vapor X can pass through the steam vent 34. If the label 40 blocks the steam vent 34 when heating the content C, the water vapor X may pass through other locations, for example, the attachment portion (sealing portion) between the lid material 30 and the container 10, and the content C may leak from that attachment portion when carrying the package after heating.

[0034] Further, according to the package 1 according to the first embodiment, the label 40 includes an innermost layer 41 composed of an adhesive layer adhered to the lid material 30, an intermediate layer 42 laminated on the innermost layer 41, and an outermost layer 43 laminated on the intermediate layer 42 and composed of a heat-shrinkable film. As a result, since the label 40 includes the outermost layer 43 that constitutes the heat-shrinkable film, the heat-shrinkable film shrinks outward so as to warp around the portion where it is partially adhered to the lid member 30 due to the temperature of the water vapor X generated when heating the content C. Thereby, the label 40 warps, and it is possible to maintain a state in which the steam vent 34 is exposed. And since this heat-shrinkable film is disposed on the outermost layer in the label 40, there is no layer-like material that inhibits the shrinkage when the heat-shrinkable film shrinks outward so as to warp, and the label 40 can warp easily and smoothly and maintain a state in which the steam vent 34 is exposed.

[0035] Moreover, according to the package 1 according to the first embodiment, the heat shrinkage rate of the heat-shrinkable film that constitutes the outermost layer 43 is 5% to 50% both in the MD and TD directions when heated at 100 ° C for 30 minutes. Thereby, when heating the content C, it is possible to avoid the possibility that the label 40 blocks the steam vent 34 without warping, or that the amount of warping of the label 40 is extremely large and reattachment is impossible. Moreover, according to the package 1 according to the first embodiment, the thickness of the heat-shrinkable film that constitutes the outermost layer 43 is 12 μm to 30 μm. Thereby, when heating the content C, it is possible to avoid the possibility that the label 40 blocks the steam vent 34 without warping, or that the amount of warping of the label 40 is extremely large and reattachment is impossible.

[0036] (Second Embodiment) Next, a package according to a second embodiment of the present invention will be described with reference to FIGS. 7 to 12. FIG. 7 shows a state before heating the content of the package according to the second embodiment of the present invention. The package 101 shown in FIG. 7 accommodates the content C heated in a microwave oven, and discharges the water vapor X (see FIGS. 10 and 11) generated from the content C, in the same manner as the package 1 according to the first embodiment shown in FIG. The content C is an object to be heated that generates water vapor when heated in a microwave oven, and is, for example, food. The package 101 according to the second embodiment is different in that it constitutes a standing pouch, while the package 1 according to the first embodiment is composed of the container 10 and the lid 20.

[0037] Therefore, the package 101 includes a sheet 110 having a plurality (three in this embodiment) of first sheet portions 111, second sheet portions 112, and a bottom sheet portion 113, and a sealing portion 120 that seals the first sheet portion 111, the second sheet portion 112, and the bottom sheet portion 113 so that a storage space 114 for storing the content C is formed.

[0038] The first sheet portion 111 and the second sheet portion 112 face each other so that a storage space 114 for storing the content C is formed between the first sheet portion 111 and the second sheet portion 112. The first sheet portion 111 and the second sheet portion 112 are formed in a substantially rectangular shape extending in the left - right direction (the left - right direction in FIG. 7) and the up - down direction (the up - down direction in FIG. 7). The bottom sheet portion 113 is disposed at the bottom of the first sheet portion 111 and the bottom of the second sheet portion 112 so as to close the space between the bottom (lower part) of the first sheet portion 111 and the bottom (lower part) of the second sheet portion 112.

[0039] As shown in FIG. 9, the first sheet portion 111, the second sheet portion 112, and the bottom sheet portion 113 include an innermost layer 111a, an intermediate layer 111b laminated on the innermost layer 111a, and an outermost layer 111c. As the innermost layer 111a, for example, unstretched polypropylene (CPP) is used. As the intermediate layer 111b, a stretched base material, for example, a stretched polypropylene film (OPP), a stretched polyethylene terephthalate film (PET), a stretched nylon film (ONy), etc. are used. Also, as the outermost layer 111c, a transparent stretched base material, for example, transparent vapor - deposited PET is used.

[0040] The sealing portion 120 includes an upper sealing portion 121, a lower sealing portion 122, a first side sealing portion 123, and a second side sealing portion 124. The upper sealing portion 121 joins the innermost layers 111a of the upper edges of the first sheet portion 111 and the second sheet portion 112 together. The lower sealing portion 122 joins the innermost layer 111a of the bottom sheet portion 113 to the innermost layers 111a of the lower edges of the first sheet portion 111 and the second sheet portion 112. The first side sealing portion 123 joins the innermost layers 111a of the left edges of the first sheet portion 111 and the second sheet portion 112 together. The second side sealing portion 124 joins the innermost layers 111a of the right edges of the first sheet portion 111 and the second sheet portion 112 together.

[0041] And in the first sheet portion 111, a steam vent 115 for discharging steam X (see FIGS. 10 and 11) generated by heating is formed. As shown in FIG. 7, this steam vent 115 is formed at a substantially central portion of the first sheet portion 111 and is formed by a single cut line in a left - right U - shape. By forming the steam vent 115 in a left - right U - shape in the first sheet portion 111, a tongue piece 116 that extends in the left - right direction in a cantilever shape from the base end portion 116a is formed in the region inside the steam vent 115.

[0042] Moreover, the package 101 includes a label 130 that is attached to the first sheet portion 111 in which the steam vent 115 is formed so as to block the steam vent 115. This label 130 is formed in a rectangular flat plate shape with a predetermined plate thickness, similar to the label 40 in the first embodiment, and is attached to the first sheet portion 111 so as to block the steam vent 115 such that its longitudinal direction is in the left - right direction. As shown in FIGS. 8 and 9, this label 130 is peeled off so that a partial attachment state remains from the first sheet portion 111 before heating the contents C to expose the steam vent 115.

[0043] Here, when peeling off the label 130, as shown in FIGS. 8 and 9, it is peeled off from one longitudinal end 130b on the base end portion 116a side of the tongue piece 116 formed on the first sheet portion 111 of the label 130, so that the adhered state of the base end portion 130a on the other longitudinal end 130c side of the label 130 remains. As a result, as shown in FIG. 9, while the tongue piece 116 rotates upward (outward) around the base end portion 116a, the steam vent 115 is exposed. In this way, by peeling the label 130 from the first sheet portion 111 so that the adhered state of the base end portion 130a remains, when reattaching the label 130 described later, it can be reattached at an accurate position that can firmly block the steam vent 115.

[0044] By peeling the label 130 from one longitudinal end 130b on the base end portion 116a side of the tongue piece 116 formed on the first sheet portion 111, it is possible to prevent the tongue piece 116 from being torn off from the first sheet portion 111. If the label 130 is peeled from the other longitudinal end 130c side of the label 130, the tongue piece 116 may rotate too much upward (outward) around the base end portion 116a while remaining attached to the label 130, and the tongue piece 116 may be torn off from the first sheet portion 111.

[0045] Also, as shown in FIGS. 10 and 11, the label 130 maintains the state in which the steam vent 115 is exposed when heating the content C. As a result, when heating the content C, as shown in FIGS. 10 and 11, the water vapor X generated from the heated content C can steam through the steam vent 115. Here, if the label 130 blocks the steam vent 115 when heating the content C, the water vapor may steam through any of the upper seal portion 121, the lower seal portion 122, the first side seal portion 123, and the second side seal portion 124, and the content C may leak from the seal portion when carried after heating.

[0046] Further, after heating the contents C, as shown in FIG. 12, the label 130 can be reattached to the first sheet portion 111 so as to cover the steam vent 115. When reattaching the label 130, it is reattached to the first sheet portion 111 from one longitudinal end portion 130b side opposite to the other longitudinal end portion 130c having the attached base end portion 130a. Thereby, the steam vent 115 can be sealed, and the package 101 can be carried without the contents C leaking from the steam vent 115.

[0047] Here, as shown in FIGS. 9 and 11, the label 130 includes an innermost layer 131 composed of an adhesive layer adhered to the first sheet portion 111, an intermediate layer 132 laminated on the innermost layer 131, and an outermost layer 133 laminated on the intermediate layer 132 and composed of a heat-shrinkable film. As the adhesive layer constituting the innermost layer 131, for example, an acrylic adhesive layer is used. Also, as the intermediate layer 132, a film having no heat shrinkability, for example, a stretched base material such as a stretched polypropylene film (OPP), a stretched polyethylene terephthalate film (PET), or a stretched nylon film (ONy) is used.

[0048] Furthermore, as the heat-shrinkable film constituting the outermost layer 133, for example, a PET film having heat shrinkability is used. Thus, since the label 130 includes the outermost layer 133 composed of a heat-shrinkable film, as shown in FIG. 11, the heat-shrinkable film constituting the outermost layer 133 shrinks outward (upward) around the base end portion 130a on the other longitudinal end portion 130c side of the label 130 where the adhered state remains, due to the temperature of the water vapor X generated when heating the contents C. As a result, the label 130 warps, and the state where the steam vent 115 is exposed can be maintained.

[0049] And since this heat-shrinkable film is disposed in the outermost layer 133 of the label, when the heat-shrinkable film shrinks and warps outward, there is no layer that inhibits the shrinkage, and the label 130 can warp easily and smoothly and maintain the state where the steam vent 115 is exposed. Here, the heat shrinkage rate of the heat-shrinkable film constituting the outermost layer 133 is 5% to 50% both in the MD and TD directions when heated at 100 °C for 30 minutes. Thereby, when heating the content C, it is possible to avoid the risk that the label 130 warps and closes the steam vent 115 without warping, or that the amount of warping of the label 130 is so large that it cannot be reattached. If the heat shrinkage rate of the heat-shrinkable film is less than 5%, there is a risk that the label 130 warps and closes the steam vent 115 without warping. On the other hand, if the heat shrinkage rate of the heat-shrinkable film is greater than 50%, there is a risk that the amount of warping of the label 130 is too large to be reattached to the first sheet portion 111.

[0050] Also, the thickness of the heat-shrinkable film constituting the outermost layer 133 is 12 μm to 30 μm. Thereby, when heating the content C, it is possible to avoid the risk that the label 130 warps and closes the steam vent 115 without warping, or that the amount of warping of the label 130 is so large that it cannot be reattached. If the thickness of the heat-shrinkable film is thicker than 30 μm, there is a risk that the label 130 warps and closes the steam vent 115 without warping. On the other hand, if the thickness of the heat-shrinkable film is thinner than 12 μm, there is a risk that the amount of warping of the label 130 is too large to be reattached to the first sheet portion 111.

[0051] In the package 101 configured as described above, when eating the content C in the package 101, first, as shown in FIGS. 8 and 9, before heating the content C, the label 130 is peeled from the first sheet portion 111 so that the adhered state of the base end portion 130a remains from one end portion 130b side in the longitudinal direction thereof to expose the steam vent 115. Next, the package 101 with the steam vent 115 exposed is placed in a microwave oven to heat the content C.

[0052] During this heating process, as shown in FIGS. 10 and 11, the heat-shrinkable film that constitutes the outermost layer 133 of the label 130 shrinks outward (upward) around the base end 130a on the other end 130c side in the longitudinal direction of the label 130 where the adhered state remains, due to the temperature of the water vapor X generated when heating the contents C. As a result, the label 130 warps, maintaining a state where the steam vent 115 is exposed. Thereby, the water vapor X generated from the heated contents C vents through the steam vent 115.

[0053] Next, after heating the contents C with a microwave oven is completed, the package 101 is taken out of the microwave oven, and the label 130 is re-adhered to the first sheet portion 111 from the longitudinal one end 130b side opposite to the longitudinal other end 130c where the base end 130a is adhered, as shown in FIG. 12, covering the steam vent 115. Next, after covering the steam vent 115 with the label 130, the package 101 is put into a my bag or the like and carried (taken out).

[0054] At this time, since the steam vent 115 is covered with the label 130, the steam vent 115 is sealed, and the package 101 can be carried without the contents C leaking from the steam vent 115. Thereafter, the package 1 is cut along the cutting line CL to open the accommodation space 14, and the heated contents C can be eaten. Thus, according to the package 101 according to the second embodiment, the label 130 adhered so as to block the steam vent 115 formed in the first sheet portion 111 is partially peeled off from the first sheet portion 111 so that the adhered state remains before heating the contents C, exposing the steam vent 115, maintaining the state where the steam vent 115 is exposed when heating the contents C, and can be re-adhered to the first sheet portion 111 so as to cover the steam vent 115 after heating the contents C.

[0055] By re - attaching the label 130 to the first sheet portion 111 so as to cover the steam vent 115 after heating the contents C, the steam vent 115 can be sealed, and the package 101 can be carried without the contents C leaking from the steam vent 115. Also, since the label 130 maintains the state where the steam vent 115 is exposed when the contents C are being heated, water vapor X can pass through the steam vent 115. If the label 130 blocks the steam vent 115 when the contents C are being heated, the water vapor X may pass through any of the upper seal portion 121, the lower seal portion 122, the first side seal portion 123, and the second side seal portion 124, and the contents C may leak from that seal portion when carried after heating.

[0056] Also, according to the package 101 according to the second embodiment, the label 130 includes an innermost layer 131 composed of an adhesive layer adhered to the first sheet portion 111, an intermediate layer 132 laminated on the innermost layer 131, and an outermost layer 133 laminated on the intermediate layer 132 and composed of a heat - shrinkable film. Thereby, since the label 130 has the outermost layer 133 composed of a heat - shrinkable film, the heat - shrinkable film shrinks outward around the part where it is partially adhered to the first sheet portion 111 due to the temperature of the water vapor X generated when the contents C are being heated, whereby the label 130 warps and can maintain the state where the steam vent 115 is exposed. And since this heat - shrinkable film is disposed as the outermost layer in the label 130, there is no layer - like material that inhibits the shrinkage when the heat - shrinkable film shrinks outward, and the label 130 can warp easily and smoothly and maintain the state where the steam vent 115 is exposed.

[0057] Also, according to the package 101 according to the second embodiment, the heat - shrinkage rate of the heat - shrinkable film constituting the outermost layer 133 is 5% - 50% both in the MD and TD directions when heated at 100°C for 30 minutes. Thereby, when the contents C are being heated, it is possible to avoid the possibility that the label 130 blocks the steam vent 115 without warping or that the amount of warping of the label 130 is extremely large and it cannot be re - attached. Also, according to the package 101 according to the second embodiment, the thickness of the heat-shrinkable film constituting the outermost layer 133 is 12 μm to 30 μm.

[0058] Thereby, when heating the content C, it is possible to avoid the risk that the label 130 warps and closes the steam vent 115 without warping, or the amount of warping of the label 130 is extremely large and it cannot be reattached. As described above, the embodiments of the present invention have been described, but the present invention is not limited thereto and various changes and improvements can be made. For example, the shape and material of the container 10 in the package 1 according to the first embodiment are not limited to the illustrated example. Also, the shape and layer structure of the lid material 30 in the package 1 according to the first embodiment are not limited to the illustrated example. The lid material 30 is formed in a rectangular shape, but can be appropriately changed according to the shape of the container 10. Further, the intermediate layer 32 and the outermost layer 33 of the lid material 30 may be formed as a single layer structure.

[0059] Also, the package 101 according to the second embodiment constitutes a standing pouch, but it may be applied to other types of pouches such as flat pouch types, gusset pouch types, and pillar pouch types other than the standing pouch. Also, the sheet 110 in the package 101 according to the second embodiment is composed of three sheet portions, namely, the first sheet portion 111, the second sheet portion 112, and the bottom sheet portion 113, but the number of the sheet portions is not limited to three as long as it is plural.

[0060] In addition, although the steam vent 34 in the package 1 according to the first embodiment is formed at the substantially central portion of the lid material 30, the formation position of the steam vent 34 may be other than the substantially central portion as long as it is on the lid material 30. Further, although the steam vent 115 in the package 101 according to the second embodiment is formed at the substantially central portion of the first sheet portion 111, it may be formed at other positions of the first sheet portion 111 other than the substantially central portion, or may be formed on the second sheet portion 112 or the bottom sheet portion 113. That is, the steam vent 1115 may be formed on any one of the sheet portions of the first sheet portion 111, the second sheet portion 112, and the bottom sheet portion 113.

[0061] In addition, the shapes of the steam vent 34 in the package 1 according to the first embodiment and the steam vent 115 in the package 101 according to the second embodiment are not limited to a horizontal U shape or a left - right U shape, and may be other shapes. Also, although the steam vents 34 and 115 are formed by a single cut line, they may be formed by a plurality of cut lines. In addition, although the labels 40 in the package 1 according to the first embodiment and the labels 130 in the package 101 according to the second embodiment are each formed in a rectangular shape, they are not limited to these as long as they can open and close the steam vent 34. Also, in the labels 40 and 130, the outermost layers 43 and 133 are made of a heat - shrinkable film, and the intermediate layers 42 and 132 are made of a film having no heat - shrinkability. However, the outermost layers 43 and 133 may be made of a film having no heat - shrinkability, and the intermediate layers 42 and 132 may be made of a heat - shrinkable film.

Examples

[0062] To verify the effects of the present invention, for each of the packages of Examples 1 to 3 and Comparative Examples 1 to 2 and the packages of Examples 4 to 6 and Comparative Examples 3 to 4, the leakage of the contents at the time of take - out was investigated. The specifications of the containers, lid materials, and labels in the packages of Examples 1 to 3 and Comparative Example 1 are as follows. For the package of Comparative Example 2, the specifications of the container and the lid material are the same as those of the packages of Examples 1 to 3 and Comparative Example 1, but no steam vent was formed in the lid material, and no label was attached either.

[0063] (Container) Material: PP with filler Dimensions: Container body with a longitudinal length of 185 mm, a transverse length of 185 mm, and a depth of 50 mm, and the flange part has a width of 8 mm (Lid material) Material: (outermost layer) transparent vapor-deposited PET with a thickness of 12 μm / (intermediate layer) NY with a thickness of 15 μm / (innermost layer) easy peel with a thickness of 30 μm Dimensions: longitudinal length of 185 mm × transverse length of 185 mm Steam vent: A horizontally U-shaped steam vent is formed in the central part of the lid material

[0064] (Label) Material: (outermost layer) PET of A - D in Table 1 / (intermediate layer) OPP with a thickness of 50 μm / (innermost layer) acrylic adhesive layer with a thickness of 20 μm Regarding the PET of A - D that constitutes the outermost layer of the label, PET - A is DE041 manufactured by Toyobo Co., Ltd., and its heat shrinkage rate is, when heated at 100 °C for 30 minutes, MD: 10 (%), TD: 5 (%). PET - B is DE032 manufactured by Toyobo Co., Ltd., and its heat shrinkage rate is, when heated at 100 °C for 30 minutes, MD: 50 (%), TD: 30 (%). PET - C is S7200 manufactured by Toyobo Co., Ltd., and its heat shrinkage rate is, when heated at 100 °C for 30 minutes, MD: 40 (%), TD: 45 (%). PET - D is E5100 manufactured by Toyobo Co., Ltd. and has no heat shrinkability. Dimensions: longitudinal length of 30 mm × transverse length of 30 mm Adhesion position: It is adhered at a position covering the steam vent in the central part of the lid material

[0065] (Other conditions) After filling the container with soup pasta as the content, the lid material was heat-sealed to the container and heated in a microwave oven at 600 W for 3 minutes. Then, while holding the plastic bag containing the cooked package with the right hand, a 100 - meter walk was taken at a brisk pace (5 km / h). The investigation results of the packages of Examples 1 - 3 and Comparative Examples 1 - 2 are shown in Table 1.

[0066]

Table 1

[0067] For Examples 1 to 3, during the range-up, the label maintained a concave curl state and steam passed through the steam vent. And regarding the leakage of the contents at the time of takeout, no leakage was found for 10 subjects, and the judgment result was "○". For Comparative Example 1, during the range-up, the label adhered to the steam vent, and steam passed through the seal portion (seal flange) of the lid material and the container. Therefore, regarding the leakage of the contents at the time of takeout, 4 out of 10 subjects found leakage of the contents from the seal flange, and the judgment result was "×".

[0068] Also, for Comparative Example 2, since no steam vent was formed in the lid material, the lid material was peeled off from the flange portion at the corner of the container. Therefore, steam passed through the corner peeling portion. And regarding the leakage of the contents at the time of takeout, 6 out of 10 subjects found leakage of the contents from the corner peeling portion, and the judgment result was "×".

[0069] From the above results, it was confirmed that in a package including a container, a lid material, and a label, by using a label whose outermost layer is composed of a heat-shrinkable film, leakage of the contents at the time of takeout can be suppressed. Also, the specifications of the standing pouch and the label in the packages of Examples 4 to 6 and Comparative Example 3 are as follows. The package of Comparative Example 4 will be described later.

[0070] (Standing Pouch) Material of each sheet part: (outermost layer) transparent vapor-deposited PET with a thickness of 12 μm / (intermediate layer) NY with a thickness of 15 μm / (innermost layer) CPP with a thickness of 60 μm Dimensions: height in the vertical direction 158 mm × length in the horizontal direction 160 mm, width of each seal part 6 mm Steam vent: A left-right U-shaped steam vent is formed at the center of the first sheet part

[0071] (Label) Material: (outermost layer) PET of A - D in Table 2 / (intermediate layer) OPP with a thickness of 50 μm / (innermost layer) acrylic adhesive layer with a thickness of 20 μm Regarding the PET of A - D that constitutes the outermost layer of the label, PET - A is DE041 manufactured by Toyobo Co., Ltd., and its heat shrinkage rate is MD: 10 (%), TD: 5 (%) when heated at 100 °C for 30 minutes. PET - B is DE032 manufactured by Toyobo Co., Ltd., and its heat shrinkage rate is MD: 50 (%), TD: 30 (%) when heated at 100 °C for 30 minutes. PET - C is S7200 manufactured by Toyobo Co., Ltd., and its heat shrinkage rate is MD: 40 (%), TD: 45 (%) when heated at 100 °C for 30 minutes. PET - D is E5100 manufactured by Toyobo Co., Ltd. and has no heat shrinkability. Dimensions: length in the vertical direction 30 mm × length in the horizontal direction 30 mm Adhesive position: Stick at the position covering the steam vent at the center of the first sheet part.

[0072] (Other conditions) After filling the soup pasta as the content into the accommodation space formed between each sheet part, seal each sheet at the seal part and heat it in a microwave oven at 600 W for 3 minutes. Then, while holding the plastic bag with the cooked package in the right hand, walk 100 m at a brisk walk (5 km / h).

[0073] (Regarding Comparative Example 4) Regarding the package of Comparative Example 4, it is shown in Fig. 13. This package 201 includes a sheet 210 having three first sheet parts 211, a second sheet part 212, and a bottom sheet part 213, and a seal part 220 for sealing the first sheet part 211, the second sheet part 212, and the bottom sheet part 213 so that an accommodation space 214 for accommodating the content C is formed. The seal part 220 includes an upper seal part 221, a lower seal part 222, a first side seal part 223, and a second side seal 224.

[0074] And the materials of each of the first sheet part 211, the second sheet part 212, and the bottom sheet part 213 are as follows: outermost layer: transparent vapor-deposited PET with a thickness of 12 μm / intermediate layer: NY with a thickness of 15 μm / innermost layer: CPP with a thickness of 60 μm. Also, the dimensions of the standing pouch are a height of 158 mm in the vertical direction × a length of 160 mm in the horizontal direction. Further, the width of each of the upper seal part 221, the lower seal part 222, the first side seal part 223, and the second side seal 224 is 6 mm. In the package 201 of Comparative Example 4, no steam vent was formed and no label was attached. Therefore, in order to allow steam to pass through, as shown in Fig. 13, it was cut along the corner cutting line 230 at the corner of the first sheet part 211 and the second sheet part 212. Table 2 shows the investigation results of the packages of Examples 4 to 6 and Comparative Examples 3 to 4.

[0075]

Table 2

[0076] Regarding Examples 4 to 6, during the range-up, the label maintained a concave curl state and steam passed through the steam vent. And regarding the leakage of the contents at the time of takeout, no leakage was found for 10 subjects, and the judgment result was "○". Regarding Comparative Example 3, during the range-up, the label adhered to the steam vent and steam passed through the side seal part. Therefore, regarding the leakage of the contents at the time of takeout, 8 out of 10 subjects found leakage of the contents from the side seal part, and the judgment result was "×".

[0077] Also, regarding Comparative Example 4, steam passed through the cut portion along the corner cutting line 230 at the corner of the first sheet part 211 and the second sheet part 212. And regarding the leakage of the contents at the time of takeout, 6 out of 10 subjects found leakage of the contents from the corner cut portion, and the judgment result was "×". From the above results, it was confirmed that in the package assuming a standing pouch, by using a label whose outermost layer is composed of a heat-shrinkable film, leakage of the contents during takeout can be suppressed.

Explanation of Signs

[0078] 1 Package 10 Container 11 Container body 12 Accommodation space 13 Flange portion 20 Lid 30 Lid material 31 Innermost layer 32 Intermediate layer 33 Outermost layer 34 Steam vent 35 Tongue piece 35a Base end portion 40 Label 40a Base end portion 40b One longitudinal end portion 40c The other longitudinal end portion 41 Innermost layer 42 Intermediate layer 43 Outermost layer 101 Package 110 Sheet 111 First sheet portion 111a Innermost layer 111b Intermediate layer 111c Outermost layer 112 Second sheet portion 113 Bottom sheet portion 114 Accommodation space 115 Steam vent 116 Tongue piece 116a Base end portion 120 Seal portion 121 Upper seal portion 122 Lower seal portion 123 First side seal portion 124 Second side seal portion 130 Label 130a Base end portion 130b One longitudinal end portion 130c The other longitudinal end portion 131 Innermost layer 132 Middle layer 133 Outermost layer C Contents CL Cutting line X Water vapor

Claims

Claim 1 A package for containing a content to be heated in a microwave oven, comprising: a container having a storage space for storing the content, and a lid attached to the container; the lid is attached to the container so as to close the storage space, and includes a lid material forming a steam vent for discharging steam generated by heating, and a label attached to the lid material so as to close the steam vent; the label is peeled off so that a part of the adhered state remains from the lid material before heating the content to expose the steam vent, maintains the exposed state of the steam vent when heating the content, and can be reattached to the lid material so as to cover the steam vent after heating the content; when peeling off the label before heating the content, peel off from one end in the longitudinal direction on the base end side of a tongue piece formed in a cantilever shape from the base end in the region inside the steam vent of the label, and leave the adhered state of the base end on the other end side in the longitudinal direction of the label; the label includes an innermost layer composed of an adhesive layer adhered to the lid material, an intermediate layer laminated on the innermost layer, and an outermost layer laminated on the intermediate layer and composed of a heat-shrinkable film; The package is characterized in that the thickness of the heat-shrinkable film constituting the outermost layer is 12 μm to 30 μm. Claim 2 The package according to claim 1, wherein the thickness of the heat-shrinkable film constituting the outermost layer is 12 μm to 20 μm. Claim 3 The package according to claim 1 or 2, wherein the heat shrinkage rate of the heat-shrinkable film constituting the outermost layer is 5% to 50% both in the MD and TD directions when heated at 100° C. for 30 minutes.

Images