Steam exhaust structure for containers for microwave-heated foods

Abstract

To provide a steam discharge structure of a container for food to be heated by a microwave oven which structure can favorably prevent rupture of the container during heating, and which can favorably prevent deformation of the container after heating.SOLUTION: A steam discharge structure includes: a lid 3 for closing an opening part of a container body; a first ventilation part 32 provided at the lid 3; a label 4 attached to the lid 3 so as to cover the first ventilation part 32; a second ventilation part 41 provided in the label 4 so as to be partially overlapped with the first ventilation part 32; and ventilation passages 11 leading to an outer edge of the label 4 passing between the lid 3 and the label 4 from the first ventilation part 32.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to a steam exhaust structure for a container for heating food in a microwave oven, in which food is heated in the container using a microwave oven. [Background technology]

[0002] A widely known food container for heating in a microwave oven has a lid with a vent provided therein, and a label is attached to the lid so as to cover the vent (Patent Document 1). In a food container for heating in a microwave oven with this type of steam exhaust structure, when food inside is heated in a microwave oven, the internal pressure of the container due to the generated steam causes a part of the adhesive part of the label to peel off from the lid, forming an air passage, and the steam is exhausted from the vent through the air passage to the outside. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2008-253481 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, the adhesive strength of the label varies. If the adhesive strength is too strong, it may not peel off when heated, and the air passage may not be properly formed. In this case, steam cannot be discharged, and the internal pressure of the container increases, which may cause the container to burst.

[0005] Even if the air passage is properly formed, the label may stick to the lid as the internal pressure of the container decreases after heating, closing the air passage. In this case, the internal pressure of the container will continue to decrease because outside air cannot be taken in, and the container may become deformed.

[0006] Therefore, the present invention has been made in consideration of such circumstances, and its objective is to provide a steam exhaust structure for a container for microwave heating food that can effectively prevent the container from bursting when heated, and can effectively prevent the container from deforming after heating. [Means for solving the problem]

[0007] 1. The steam exhaust structure of the container for microwave heating food according to the present invention comprises: A lid for closing the opening of the container body; It is a linear break, A first ventilation portion provided in the lid; a label attached to the lid so as to cover the first ventilation portion; It is a linear cut that intersects with the first ventilation section at the intersection a second ventilation portion provided on the label so as to partially overlap the first ventilation portion; An air passage extending from the first ventilation portion through a gap between the lid and the label to an outer edge of the label. This is a steam exhaust structure for a container for heating food in a microwave oven.

[0008] The steam exhaust structure of the container for microwave heating food according to the second aspect of the present invention is as follows: A lid for closing the opening of the container body; A first ventilation portion which is a linear cut and is provided in the lid; a label attached to the lid so as to cover the first ventilation portion; a second ventilation portion that is a group of holes that are arranged two-dimensionally and is provided in the label so as to partially overlap the first ventilation portion at an overlapping portion of a part of the cut and a part of the holes; An air passage extending from the first ventilation portion through a gap between the lid and the label to an outer edge of the label. This is a steam exhaust structure for a container for heating food in a microwave oven.

[0009] The steam exhaust structure of the container for microwave heating food according to the third aspect of the present invention is as follows: A lid for closing the opening of the container body; A first ventilation portion provided in the lid; a label attached to the lid so as to cover the first ventilation portion; a second ventilation portion provided on the label so as to partially overlap the first ventilation portion; an air passage extending from the first ventilation portion through a gap between the lid and the label to an outer edge of the label; a cover releasably joined to the lid so as to cover the label; The lid and the cover are integrally joined to the flange portion of the opening edge of the container body. This is a steam exhaust structure for a container for heating food in a microwave oven.

[0010] Here, as one embodiment of the steam exhaust structure of the container for microwave heating food according to the first to third aspects of the present invention, The ventilation path is normally closed by an annular adhesive portion provided on the inner surface of the label so as to surround the first ventilation portion. The above configuration can be adopted.

[0012] Also, As an embodiment of the steam exhaust structure of a container for microwave heating food according to the third aspect of the present invention, The bonding strength between the lid and the cover is set to be smaller than the bonding strength between the flange and the lid. The above configuration can be adopted. Effect of the Invention

[0013] According to the present invention, two types of paths are provided: a path from the first ventilation part through the second ventilation part, and a path from the first ventilation part through the ventilation path. Therefore, when heated, steam can be reliably discharged, and furthermore, the container can be suitably prevented from bursting. This is the same even if the ventilation path does not function properly.

[0014] Furthermore, according to the present invention, even if the ventilation passage is closed, the path from the second ventilation part through the first ventilation part remains open, so that after heating, outside air can be taken in, and deformation of the container can be suitably prevented. [Brief description of the drawings]

[0015] [Figure 1] FIG. 1 is an exploded perspective view of a container for heating food in a microwave oven, which is provided with a steam exhaust structure according to a first embodiment. [Diagram 2] Figure 2(a) is a perspective view of the container for heating food in a microwave oven, and Figure 2(b) is a perspective view of the container for heating food in a microwave oven with the cover removed. [Diagram 3] FIG. 3 is an exterior view of the lid. [Figure 4] Figure 4(a) is an outer view of the label, and Figure 4(b) is an inner view of the label. [Diagram 5] FIG. 5 is an exterior view of the labeled lid of FIG. [Figure 6] Fig. 6(a) is an outer view of a label of the vapor exhaust structure according to embodiment 2. Fig. 6(b) is an inner view of the label. [Figure 7] FIG. 7 is an exterior view of the labeled lid of FIG. [Figure 8] Fig. 8(a) is an outer view of a label having a steam discharge structure according to embodiment 3. Figs. 8(b) and (c) are cross-sectional views taken along line AA in Fig. 8(a). Fig. 8(d) is an inner view of the label. [Figure 9] FIG. 9 is an exterior view of the labeled lid of FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] <Embodiment 1> Hereinafter, a container for heating food in a microwave oven having a steam exhaust structure according to a first embodiment of the present invention will be described with reference to Figs. 1 to 5.

[0017] As shown in Figures 1 and 2, container 1 for food to be heated in a microwave oven comprises a container body 2, a lid 3, and a label 4. Container body 2 has a flange portion 20 around the periphery of the opening. Lid 3 is joined to flange portion 20 to close the opening of container body 2. Lid 3 has a first ventilation portion 32. Label 4 is attached to lid 3 so as to cover first ventilation portion 32. Label 4 has a second ventilation portion 41 so as to partially overlap first ventilation portion 32.

[0018] The container body 2 is formed by thermoforming a plastic sheet by sheet forming such as vacuum forming, pressure forming, vacuum pressure forming, double-sided vacuum forming, hot plate forming, etc. The plastic sheet is, for example, a plastic sheet such as polystyrene (PS), polypropylene (PP), polyethylene terephthalate (PET), polyvinyl chloride (PVC), etc. Also, the container body 2 can be made of various known containers such as paper, a laminate of paper and a plastic sheet, metal, etc.

[0019] The lid 3 includes a lid body 30 and a gripping piece 31. The lid body 30 has the same shape as the outer edge of the flange portion 20. Since the flange portion 20 is annular, the lid body 30 is circular. If the flange portion 20 is, for example, a rectangular ring, the lid body 30 will be, for example, a rectangular polygon. The gripping piece 31 is a portion that protrudes from the lid body 30, and is a portion that protrudes from the flange portion 20 when the lid 3 is joined to the container body 2. When opening the lid 3, the gripping piece 31 is gripped and peeled off from the flange portion 20.

[0020] The lid 3 is a flexible sheet having adhesiveness or heat-weldability on the inner surface. In this embodiment, the lid 3 is a lid for top sealing. The top seal refers to the process of covering the opening of the container body 2 with the sheet of the lid 3, and then heat-welding (annular welded portion 10) the flange portion 20 and the sheet of the lid 3, and the product itself. The sheet is a plastic sheet having heat-weldability, such as polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), oriented nylon (ONY), etc. Alternatively, the sheet is a laminated sheet of two or more kinds of plastic sheets. As one form of the laminated sheet, the sheet is formed by laminating an easy peel layer, a base layer, and an easy peel layer in this order from the outer surface side. For example, oriented nylon (ONY) is used as the base layer. For example, an easy peel film is used as the easy peel layer. The sheet may be any of various known sheets, such as a paper sheet with adhesive or heat-welding properties on the inner surface, a laminated sheet of a paper sheet and a plastic sheet, a laminated sheet including a metal layer, etc. Note that the term "sheet" is not defined by thickness, but is a concept that includes films (hereinafter the same).

[0021] The label 4 (label body 40) is rectangular. In addition, the label 4 (label body 40) may be in various shapes such as a circle, an oval, or a triangle. A printing layer is formed on the outer surface of the label 4. The printing layer is intended to display product information or precautions for heating in a microwave oven.

[0022] The label 4 (label body 40) is a flexible sheet having adhesive properties on the inner surface. The label 4, which is a sheet piece, is attached to (the center of) the outer surface of the lid 3 (lid body 30). The term "adhesion" includes the concept of adhesion. The sheet is a plastic sheet such as polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), oriented nylon (ONY), or the like. Alternatively, the sheet is a laminated sheet of two or more types of plastic sheets. Also, the sheet may be any of various known sheets, such as a paper sheet having adhesive properties on the inner surface, a laminated sheet of a paper sheet and a plastic sheet, or a laminated sheet including a metal layer.

[0023] The microwave food container 1 further comprises a cover 5. The cover 5 is releasably joined to the lid 3 so as to cover the label 4. More specifically, the cover 5 is joined to the lid 3 on the flange portion 20 and overlaps the lid 3.

[0024] The cover 5 includes a cover body 50 and a gripping piece 51. The cover body 50 has the same shape as the outer edge of the flange portion 20 (the outer edge of the lid body 30). Since the flange portion 20 is annular, the cover body 50 is circular. If the flange portion 20 is, for example, a rectangular ring, the cover body 50 will be, for example, rectangular. The gripping piece 51 is a portion that protrudes from the cover body 50, and is a portion that protrudes from the flange portion 20 when the cover 5 is joined to the lid 3. The cover 5 is peeled off from the outer edge of the lid 3 by gripping the gripping piece 51.

[0025] The cover 5 is a flexible sheet having adhesive or heat-weldability on the inner surface. The sheet is a plastic sheet having heat-weldability, such as polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), or oriented nylon (ONY). Alternatively, the sheet is a laminated sheet of two or more kinds of plastic sheets. As one form of the laminated sheet, the sheet is formed by laminating a base layer and an easy-peel layer in this order from the outer surface side. For example, oriented nylon (ONY) or polyethylene terephthalate (PET) is used as the base layer. For example, an easy-peel film is used as the easy-peel layer. In addition, the sheet may be any of various known sheets, such as a paper sheet having adhesive or heat-weldability on the inner surface, a laminated sheet of a paper sheet and a plastic sheet, or a laminated sheet including a metal layer.

[0026] The cover 5 (the cover body 50) is joined to the lid 3 (the lid body 30) at the annular welded portion 10. That is, the flange portion 20, the outer edge of the lid 3, and the outer edge of the cover 5 are integrally joined by the annular welded portion 10. The joining method is as follows: i) a method in which the label 4 is attached to a sheet (original roll) of the lid 3, a sheet (original roll) of the cover 5 is placed on top of the label 4, and these sheets (original rolls) are placed over the opening of the container body 2, and then the flange portion 20, the sheet (original roll) of the lid 3, and the sheet (original roll) of the cover 5 are heat-welded; ii) A method in which a sheet (original roll) of the lid 3 to which the label 4 has been affixed is placed over the opening of the container body 2, a sheet (original roll) of the cover 5 is placed on top of the sheet (original roll) of the cover 5, and then the flange portion 20, the sheet (original roll) of the lid 3, and the sheet (original roll) of the cover 5 are thermally welded together; iii) A method in which a sheet (original cloth) of the lid 3 is placed over the opening of the container body 2, a label 4 is attached to the sheet (original cloth) of the lid 3, a sheet (original cloth) of the cover 5 is placed on top of the label 4, and then the flange portion 20, the sheet (original cloth) of the lid 3, and the sheet (original cloth) of the cover 5 are thermally welded together; iv) a method in which a sheet (original roll) of the lid 3 to which the label 4 has been affixed is placed over the opening of the container body 2, the flange portion 20 and the sheet (original roll) of the lid 3 are heat-welded, a sheet (original roll) of the cover 5 is placed on top of the sheet (original roll) of the lid 3, and the sheet (original roll) of the cover 5 is heat-welded to the sheet (original roll) of the lid 3 at the flange portion 20; v) a method in which a sheet (original cloth) of the lid 3 is placed over the opening of the container body 2, the flange portion 20 and the sheet (original cloth) of the lid 3 are heat-welded, the label 4 is attached to the sheet (original cloth) of the lid 3, the sheet (original cloth) of the cover 5 is placed on top of the label 4, and the sheet (original cloth) of the cover 5 is heat-welded to the sheet (original cloth) of the lid 3 at the flange portion 20; There are various methods such as:

[0027] In any case, the bonding strength between the lid 3 and the cover 5 is set to be smaller than the bonding strength between the flange portion 20 and the lid 3. This makes it possible to prevent the cover 5 from being peeled off from the lid 3 and the lid 3 together with the cover 5 from being peeled off from the flange 20 when the cover 5 is removed by pinching the tab 51. The tab 31 of the lid 3 and the tab 51 of the cover 5 are provided at positions offset in the circumferential direction of the container body 2. Alternatively, when the sheet raw material of the lid 3 and the sheet raw material of the cover 5 are punched simultaneously while overlapping each other to finish the outer shapes of the lid 3 and the cover 5 at the same time, the tab 31 of the lid 3 and the tab 51 of the cover 5 overlap (match).

[0028] As shown in FIG. 3, the first ventilation section 32 has a plurality of slits 32a, ... of a predetermined length along the first direction X, which are arranged in parallel at predetermined intervals in a second direction Y perpendicular to the first direction X. The slits 32a are slits that open with a minute width of about 1 mm. The first ventilation section 32 is disposed to one side in the first direction X with respect to the center line LX of the lid 3 in the first direction X. The tab 31 is provided on the other side in the first direction X.

[0029] As shown in Fig. 4, the second ventilation portion 41 has a plurality of broken line (perforation) slits 41a, 41a arranged in parallel at a predetermined interval in the first direction X along the second direction Y across the entire width of the label 4. The second ventilation portion 41 is disposed shifted to one side in the first direction X from the center line of the label 4 in the first direction X. The slits 41a may be in a form other than a broken line. The number of slits 41a may be one or three or more, other than the two in the illustrated example.

[0030] The label 4 has an adhesive portion 42 over the entire inner surface. The adhesive portion 42 is formed by applying adhesive 42a, ... in a pattern of dots arranged two-dimensionally at predetermined intervals in the first direction X and the second direction Y. The cuts 41a are provided so as to cross some of the dots.

[0031] 5, the label 4 is attached so that the first direction (longitudinal direction) of the label 4 coincides with the first direction X of the lid 3, and a portion of the label 4 on one side of the center line of the first direction X covers the first ventilation portion 32. Therefore, the second ventilation portion 41 is disposed perpendicular to the first ventilation portion 32 (so as to cross the first ventilation portion 32). The first ventilation portion 32 and the second ventilation portion 41 partially overlap at the intersection.

[0032] In addition, since the adhesive portion 42 on the inner surface of the label 4 is formed in a dot pattern, the non-adhesive portion of the label 4 is generally connected in a mesh-like pattern, and a part of it forms an air passage 11 that runs from the first ventilation portion 32 through the gap between the lid 3 and the label 4 to the outer edge of the label 4.

[0033] The container 1 for microwave heating food according to this embodiment has the above-mentioned configuration. The container 1 for microwave heating food is for retort food. For this reason, it is sterilized at high temperature and pressure. Without the cover 5, the first ventilation part 32 and the second ventilation part 41 would communicate with the inside and outside of the container 1 for microwave heating at their intersection, allowing water to enter the container from here. The cover 5 is a means for keeping the inside of the container watertight and airtight.

[0034] The container is distributed as a commercial product with cover 5 removed. When a consumer eats the food, the consumer heats the food in the container using a microwave oven. When heating the food, the steam generated is exhausted to the outside via two routes: from first ventilation section 32 to second ventilation section 41, and from first ventilation section 32 to ventilation passage 11.

[0035] After heating, the internal pressure of the container decreases, but outside air is taken into the container via a path passing from second ventilation part 41 through first ventilation part 32, so the decrease in internal pressure of the container is mitigated.

[0036] As described above, the steam exhaust structure according to this embodiment has two types of paths: a path from the first ventilation part 32 through the second ventilation part 41, and a path from the first ventilation part 32 through the ventilation passage 11. This allows steam to be exhausted reliably during heating, and ultimately prevents the container from bursting. This is true even if the ventilation passage 11 does not function properly.

[0037] Furthermore, according to the steam exhaust structure of this embodiment, even if the ventilation passage 11 is closed, the path from the second ventilation part 41 through the first ventilation part 32 remains open. Therefore, after heating, outside air can be taken in, and deformation of the container can be suitably prevented.

[0038] <Embodiment 2> A container for microwave heating food having a steam exhaust structure according to a second embodiment of the present invention will be described below with reference to Figs. 6 and 7. This embodiment differs from the first embodiment in terms of the configuration of the label 4. Other than this, the two are the same. Therefore, the following will describe the differences, and the same points will be omitted, assuming that they are the same as those in the first embodiment.

[0039] 6 and 7, the label 4 is rectangular. The label 4 has adhesive portions 42 at both end regions of the inner surface. The adhesive portions 42 are formed by applying pressure-sensitive adhesives 42b, 42b in strips along one opposing side (a pair of short sides) of the label 4.

[0040] The non-adhesive portion of label 4 (the non-adhesive portion between adhesive portions 42, 42) spans another opposing side (a pair of long sides) of label 4, and forms an air passage 11 that runs from the first ventilation portion 32 through between the lid 3 and label 4 to the outer edge of label 4.

[0041] The second ventilation portion 41 is a matrix-like hole group in which a plurality of holes 41b are two-dimensionally arranged at predetermined intervals in the first direction X and the second direction Y in the non-adhesive portion (non-adhesive portion between the adhesive portions 42, 42) of the label 4. Note that in this example, the rows of adjacent holes 41b are two-dimensionally arranged in a staggered pattern with a 1 / 2 pitch shift in the first direction X, but the rows may be two-dimensionally arranged in a lattice pattern with no shift.

[0042] In this way, the steam discharge structure according to this embodiment also provides the same advantageous effects as those provided by the steam discharge structure according to the first embodiment.

[0043] <Embodiment 3> A container for microwave heating food having a steam exhaust structure according to embodiment 3 of the present invention will be described below with reference to Figs. 8 and 9. This embodiment differs from embodiment 1 and embodiment 2 in terms of the configuration of the label 4. Other than this, the two are the same. Therefore, the following will describe the differences, and the same points will be omitted, as they are the same as those described for embodiment 1 and embodiment 2.

[0044] As shown in Figures 8 and 9, the label 4 is rectangular. The label 4 has gusset portions 43, 43 at both ends. The gusset portion 43 has a first folded piece 43a and a second folded piece 43b. The first folded piece 43a is folded back from an edge of the label main body 40 toward the inner surface of the label main body 40. The second folded piece 43b is folded back from an edge of the first folded piece 43a to the inner surface of the first folded piece 43a.

[0045] The label 4 has an adhesive portion 42 on the inner surface of the second folded piece 43b. The adhesive portion 42 is formed by applying pressure sensitive adhesives 42c, 42c in strips along one opposing side (a pair of short sides) of the label 4.

[0046] The non-adhesive portion of the label 4 (label body 40) spans the other opposing side (a pair of long sides) of the label 4, and forms an air passage 11 that runs from the first ventilation portion 32 through between the lid 3 and the label 4 to the outer edge of the label 4.

[0047] The label 4 has gusset portions 43, 43, so that the label body 40 can float from the surface connecting the pair of second folded pieces 43b, 43b. However, the folded surfaces of the gusset portion 43 are normally bonded to each other with an adhesive or the like, and the label 4 is flat. When the internal pressure of the container increases during heating, the adhesion is released, and the label body 40 can float. When the label body 40 floats, the flow path area of ​​the air passage 11 increases.

[0048] The second ventilation portion 41 has a plurality of broken line (perforation) slits 41c, ... aligned along the first direction X across the entire width of the label 4 and spaced apart at predetermined intervals in the second direction Y. In this case, the second ventilation portion 41 is disposed in parallel with the first ventilation portion 32.

[0049] In this way, the steam discharge structure according to this embodiment also provides the same advantageous effects as those provided by the steam discharge structures according to the first and second embodiments.

[0050] The present invention is not limited to the above-described embodiment, and various modifications are possible without departing from the gist of the present invention.

[0051] In each of the above embodiments, the ventilation part 32 of the lid 3 is a plurality of linear slits 32a, ... However, the present invention is not limited to this. The ventilation part of the lid can adopt various types of ventilation parts that are publicly known, such as one linear slit, a single hole or several holes (round hole, square hole, hole with a flap), a matrix-shaped hole group like the second ventilation part 41 of the above embodiment 2, etc.

[0052] In the above-mentioned embodiment 1, the linear cuts 32a, ... of the lid 3 and the linear cut 41a of the label 4 are arranged perpendicular to each other. In the above-mentioned embodiment 3, the linear cuts 32a, ... of the lid 3 and the linear cut 41c of the label 4 are arranged parallel to each other. However, the present invention is not limited to this. The cuts of both ventilation parts may be arranged to intersect at an acute angle (for example, by tilting the attachment angle of the label).

[0053] In each of the above-described embodiments, the air vent 11 communicates with the outside when the label 4 is attached to the lid 3. However, the present invention is not limited to this. For example, a ring-shaped adhesive part may be provided in the outer edge region of the inner surface of the label so as to surround the ventilation part of the lid, and the air vent may be normally closed, but when the internal pressure of the container increases during heating, (a part of) the adhesive part may peel off, and the peeling may cause the air vent to communicate with the outside.

[0054] In addition, in each of the above embodiments, the cover 5 is joined to the outer edge of the lid 3 at the flange portion 20. However, the present invention is not limited to this. For example, the cover may be joined to the lid in an annular shape in an area inside the flange portion. Also, the cover may be formed smaller than the lid and joined to the lid in an annular shape. In short, the cover and the joint may have any shape as long as the inside of the container is kept watertight and airtight during the sterilization process.

[0055] In addition, in each of the above embodiments, the container is for retort food, and therefore the cover 5 is used. However, the present invention is not limited to this. For example, if the container is for chilled food, the food is simply heated in a microwave oven, and therefore a cover is not necessary.

[0056] In addition, in each of the above embodiments, the container is of a top seal type, and therefore a flexible sheet is used for the lid 3. However, the present invention is not limited to this. The container may be of an external fitting type, an internal fitting type, or an internal and external fitting type, in which the lid is also a hard one thermoformed from a plastic sheet, and the container body and the lid fit together.

[0057] Furthermore, as long as there is no physical interference, it is naturally possible to apply the technical elements described above to other embodiments or examples, to replace the technical elements described above with technical elements related to other embodiments or examples, and to combine the technical elements described above, and this is naturally intended by the present invention. [Explanation of symbols]

[0058] 1...container for microwave heating, 10...annular welded portion, 11...ventilation passage, 2...container body, 20...flange portion, 3...lid, 30...lid body, 31...tab, 32...first ventilation portion, 32a...slit, 4...label, 40...label body, 41...second ventilation portion, 41a...slit, 41b...hole, 41c...slit, 42...adhesive portion, 42a, 42b, 42c...adhesive, 43...gusset portion, 43a...first fold-back piece, 43b...second fold-back piece, 5...cover, 50...cover body, 51...tab, LX...center line in first direction, X...first direction, Y...second direction

Claims

1. A lid for closing the opening of the container body; A first ventilation portion which is a linear cut and is provided in the lid; a label attached to the lid so as to cover the first ventilation portion; a second ventilation portion that is a linear cut and is provided on the label so as to intersect with the first ventilation portion and partially overlap with the first ventilation portion at the intersection; and an air passage extending from the first air vent through a gap between the lid and the label to an outer edge of the label. Steam exhaust structure for a container for microwave-heated food.

2. A lid for closing an opening of a container body; A first ventilation portion which is a linear cut and is provided in the lid; a label attached to the lid so as to cover the first ventilation portion; a second ventilation portion that is a group of holes that are arranged two-dimensionally and is provided in the label so as to partially overlap the first ventilation portion at an overlapping portion of a part of the cut and a part of the holes; and an air passage extending from the first air vent through a gap between the lid and the label to an outer edge of the label. Steam exhaust structure for a container for microwave-heated food.

3. A lid for closing an opening of a container body; A first ventilation portion provided in the lid; a label attached to the lid so as to cover the first ventilation portion; a second ventilation portion provided on the label so as to partially overlap the first ventilation portion; an air passage extending from the first ventilation portion through a gap between the lid and the label to an outer edge of the label; a cover releasably joined to the lid so as to cover the label; The lid and the cover are integrally joined to the flange portion of the opening edge of the container body. Steam exhaust structure for a container for microwave-heated food.

4. The ventilation path is normally closed by an annular adhesive portion provided on the inner surface of the label so as to surround the first ventilation portion.

4. The steam exhaust structure of a container for food heated in a microwave oven according to claim 1.

5. The bonding strength between the lid and the cover is set to be smaller than the bonding strength between the flange and the lid.

4. The steam exhaust structure of a container for food heated in a microwave oven according to claim 3.

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