JP5320622B2 - Packaging container for microwave oven and method for preventing collapse of packaging container for microwave oven - Google Patents

Description

The present invention is capable of cooking as it is without cooking a relief hole before cooking when cooking contents such as food using a microwave oven, and the contents after cooking In addition, the present invention relates to a microwave oven packaging container and a method for preventing collapse of a microwave packaging container, which can prevent the packaging container from being crushed by the reduced pressure even when the packaging container is cooled and the inside is decompressed.

Conventionally, when cooking a packaging container containing foods or the like with a microwave oven, in order to prevent the packaging container from bursting due to an increase in internal pressure due to heating, After partly peeling off to form a vent, cooking was performed, or venting means such as an easily peelable seal was provided on the lid to automatically form a vent by increasing the internal pressure (For example, refer to FIG. 1 of Patent Document 1).
JP 2004-331156 A

However, in the packaging container as described above, after cooking, water droplets such as aerated water vapor adheres to the lid and the easily peelable seal and again closes the vent hole once formed. As the contents cooled, the inside was depressurized, and the packaging container could not withstand the external pressure and was deformed and crushed.

  The present invention has been made to solve the above-described problems.

The invention according to claim 1 is a container body that contains the contents therein and has a flange on the periphery of the opening, and a lid formed of a plastic material that is heat-sealed by the flange to close the opening. And an annular seal band part that is heat-sealed in an annular manner along the opening between the flange part and the portion of the lid that faces the flange part, and a part of the annular seal band part A non-seal part that does not perform heat sealing is formed, and the periphery of the non-seal part is within the heat seal region of the annular seal band part, and the flange part is moved up and down at the flange part where the non-seal part is located. A through-hole penetrating through is provided, and before cooking, the contents are cut off from the outside air by the annular seal band, and when cooking with a microwave oven, the lid body is placed outside by increasing the internal pressure in the container body. Bulge And part of the annular seal band part is peeled off, and the lid body is supported by the part of the annular seal band part that is not peeled off and is connected to the outside air through the peeled part and the through hole. The method of preventing collapse of the packaging container for a microwave oven that keeps the shape bulging outside the lid after the cooking is completed and prevents the lid from closing the through hole.

According to a second aspect of the present invention, in the method for preventing collapse of the microwave packaging container according to the first aspect, the first protrusion formed to partially protrude in the circumferential direction of the flange portion at a part of the upper surface of the flange portion. And a second convex portion that is formed on the upper surface of the flange portion and outside the first convex portion and partially protruding in the circumferential direction of the flange portion. , Provided at a portion of the flange portion that does not protrude between the first convex portion and the second convex portion, and the annular seal band portion includes the upper end of the first convex portion and the second The non-sealed portion is provided at a portion of the flange portion that does not protrude between the first convex portion and the second convex portion. Is.

According to a third aspect of the present invention, there is provided a container body that contains contents therein and is provided with a flange at the periphery of the opening, and a lid formed of a plastic material that is heat sealed to the flange to close the opening. And a plurality of annular seal portions that are annularly heat-sealed along the opening between the flange portion and the portion of the lid that faces the flange portion, and the plurality of annular seal portions include: A first annular seal portion and a second annular seal portion located outside the first annular seal portion, and the first annular seal portion and the second annular seal portion of the flange portion. A through-hole that vertically penetrates the flange portion is provided in a portion located between, and before cooking, the contents are blocked from outside air by the first annular seal portion, and during cooking by a microwave oven, The increase in internal pressure in the container body The body is bulged outwardly to peel off the first annular seal portion, and is connected to the outside air through the peeled portion and the through-hole and holds the seal of the second annular seal portion A microwave oven packaging that supports the lid by a second annular seal portion, maintains a shape bulging out of the lid after the end of cooking, and prevents the lid from closing the through-hole. This is a container collapse prevention method.

According to a fourth aspect of the present invention, in the method for preventing collapse of the microwave packaging container according to the third aspect, on the upper surface of the flange portion, a first convex portion formed to project annularly in the circumferential direction of the flange portion; A second convex portion formed on the upper surface of the flange portion outside the first convex portion and annularly projecting in the circumferential direction of the flange portion, and the through hole is formed by the first hole. Provided at a portion of the flange portion that does not protrude between the convex portion and the second convex portion, the first annular seal portion is a heat seal area including the upper end of the first convex portion The second annular seal part is a heat seal area including the upper end of the second convex part.

  The invention according to claim 5 includes a container body that contains the contents therein and has a flange on the periphery of the opening, and a lid formed of a plastic material that closes the opening of the container body. The container main body includes a first convex portion formed to partially protrude in a circumferential direction of the flange portion at a part of the upper surface of the flange portion, and an outer side of the first convex portion at the upper surface of the flange portion. The second convex part formed so as to partially project in the circumferential direction of the flange part, and the flange not projecting between the first convex part and the second convex part One or two or more through-holes that are provided in a part portion and penetrate the flange portion up and down, and the lid body has the first convex portion and the second convex shape on the upper surface of the flange portion. Heat-sealed annularly in the circumferential direction of the flange portion through the upper end of the portion And the upper surface of the flange portion between the first convex portion and the second convex portion is not heat-sealed, and the container is heated when cooked in a microwave oven. When the internal pressure rises in the body, the lid body bulges outward, the lid body peels off at the first convex portion, the internal pressure that has risen through the through hole is released, and the lid body bulges to the side. It is a packaging container for a microwave oven which prevents the plastically deformed lid body from being supported by the second convex portion and sticking to the first convex portion.

  The invention according to claim 6 includes a container body that contains the contents therein and has a flange on the periphery of the opening, and a lid formed of a plastic material that closes the opening of the container body. The container main body is formed on the upper surface of the flange portion so as to project annularly in the circumferential direction of the flange portion, and on the upper surface of the flange portion, on the outer side of the first convex portion, and Provided at a portion of the flange portion that protrudes annularly in the circumferential direction of the flange portion, and a portion of the flange portion that does not protrude between the first convex portion and the second convex portion One or two or more through holes penetrating the flange part up and down, and the lid body is annularly heat-sealed at the upper ends of the first and second convex parts of the flange part, When cooking in a microwave oven, the container book When the internal pressure rises, the lid body bulges outward, the lid body peels off at the first convex portion, the internal pressure that has risen through the through-hole is released, and the lid body bulges outward to be plastic. It is the packaging container for microwave ovens which prevents the said cover body which deform | transformed being supported by the said 2nd convex part and sticking to the said 1st convex part.

The invention according to claim 7 is the microwave packaging container according to claim 5 or 6, wherein the height of the upper end of the first convex portion in the flange portion is lower than the height of the upper end of the second convex portion. It is.

The invention according to claim 8 is the microwave packaging container according to any one of claims 5 to 7, wherein the heat seal strength between the first convex portion and the lid is the second convex portion. This is smaller than the heat seal strength between the lid and the lid.

The invention according to claim 9 is the microwave packaging container according to any one of claims 5 to 8, wherein the first convex part is a part of the first convex part in the flange part. It has a projecting portion that projects toward the inside of the container body.

  According to the method for preventing crushing of the microwave packaging container according to claim 1, the annular shape is between the flange portion and the portion of the lid body facing the flange portion and is heat-sealed annularly along the opening. A non-seal portion that does not perform heat sealing is formed on the seal band part and a part of the annular seal band part, and the periphery of the non-seal part is in the heat seal area of the annular seal band part and is the flange part. In the portion where the non-seal portion is located, a through-hole that vertically penetrates the flange portion is provided, and at the time of cooking by a microwave oven, the lid body is bulged outward due to an increase in internal pressure in the container body. Even if the internal pressure in the container body rises, a part of the annular seal band part is peeled off and connected to the outside air through the peeled part and the through hole. Let the container escape The lid body can be prevented from bursting and overflowing the contents, and the lid body is supported by the part of the annular seal band part that has not been peeled off. After the cooking, the lid body made of a plastic material is used. In order to prevent the lid body from closing the through-hole while maintaining the shape bulging outward, the container body can be prevented from being crushed due to negative pressure inside the container body even when the container body and contents are cooled. it can.

  According to the method for preventing collapse of the packaging container for microwave oven according to claim 2, in addition to the effect of the method for preventing collapse of the packaging container for microwave oven according to claim 1, A first convex portion that partially protrudes in the circumferential direction; and a portion that protrudes partially in the circumferential direction of the flange portion, outside the first convex portion on the upper surface of the flange portion. Since the through hole is provided in a portion of the flange portion that does not protrude between the first convex portion and the second convex portion, When cooking with a microwave oven, the lid body bulges outward due to an increase in internal pressure in the container body, and a part of the annular seal strip is peeled off from the upper end of the first convex part. Prevents rupture of container and overflow of contents by releasing pressure from gap formed In addition, after the end of the cooking, the shape of the lid formed of a plastic material is held outside and the lid is supported by the second convex portion so that the lid is In order to prevent the through-holes from being blocked, it is possible to prevent the container from being crushed due to negative pressure inside the container body even when the container body and contents are cooled.

  According to the method for preventing crushing of the microwave packaging container according to claim 3, a plurality of heat-sealed annularly between the flange portion and the portion of the lid body facing the flange portion and along the opening portion The annular seal portion, and the plurality of annular seal portions include a first annular seal portion and a second annular seal portion located outside the first annular seal portion, and the flange portion includes the first annular seal portion. A through-hole that vertically penetrates the flange portion is provided in a portion located between the first annular seal portion and the second annular seal portion, and the internal pressure in the container body increases during cooking by a microwave oven. The lid is bulged outwardly to peel off the first annular seal portion, and the outside air is conducted through the peeled portion and the through hole. Therefore, even if the internal pressure in the container body increases Relief pressure from the gap formed by peeling the lid The container can be prevented from rupturing and the contents can be prevented from overflowing. Moreover, the seal of the second annular seal portion is held and the lid is supported by the second annular seal portion, thereby completing the cooking. Afterwards, even if the container body and the contents cool down, the container body inside is kept at a negative pressure in order to prevent the lid body from closing the through-hole by keeping the shape bulging out of the lid made of a plastic material. Thus, the container can be prevented from being crushed.

  According to the method for preventing collapse of the packaging container for microwave oven according to claim 4, in addition to the effect of the method for preventing collapse of the packaging container for microwave oven according to claim 3, in the circumferential direction of the flange portion on the upper surface of the flange portion. A first convex portion formed to project in an annular shape, and a second convex portion formed to project annularly in the circumferential direction of the flange portion on the upper surface of the flange portion, outside the first convex portion. And the through-hole is provided at a portion of the flange portion that does not protrude between the first convex portion and the second convex portion, so that cooking by a microwave oven is performed. When the internal pressure in the container body rises, the lid is bulged outward to peel off the first annular seal part from the upper end of the first convex part, and the relief pressure is released from the gap formed by peeling off the lid. To prevent rupture of the container and overflow of the contents. Moreover, after the cooking, the shape bulging outside the lid formed of a plastic material is maintained and the lid is supported by the second convex portion so that the lid closes the through hole. In order to prevent this, even if the container body and contents are cooled, the container body can be prevented from being crushed due to negative pressure inside the container body.

According to the microwave packaging container according to claim 5, the container main body partially protrudes in the circumferential direction of the flange portion at a part of the upper surface of the flange portion, and the A second convex portion formed on the upper surface of the flange portion outside the first convex portion and partially protruding in the circumferential direction of the flange portion; the first convex portion; and the second convex portion. One or two or more through-holes that are provided in a portion of the flange portion that does not protrude between the convex portion of the flange portion and vertically penetrate the flange portion. The first convex portion and the second convex portion are heat-sealed annularly in the circumferential direction of the flange portion via the upper ends of the flange portion, and the upper surface of the flange portion, the first convex portion and the Since the part between the second convex part is not heat sealed,
When cooking with a microwave oven, the lid body bulges outward due to an increase in internal pressure in the packaging container, the lid body peels off at the first convex portion, and the elevated internal pressure is released through the through hole. In addition, since the lid is formed of a plastic material, even if the packaging container and contents are cooled after cooking, the lid that bulges outward and is plastically deformed is supported by the second convex portion. Thus, it is possible to prevent the first convex portion from sticking, and to prevent the container from being crushed due to the negative intake pressure due to the smooth intake of outside air through the above-described through hole.

  According to the microwave packaging container according to claim 6, the container main body includes a first convex portion formed in a ring shape in the circumferential direction of the flange portion on the upper surface of the flange portion, and an upper surface of the flange portion. A second convex portion formed outside the first convex portion and annularly projecting in the circumferential direction of the flange portion; the first convex portion and the second convex portion; One or two or more through-holes that are provided in a portion of the flange portion that does not protrude between and vertically penetrate the flange portion, and the lid body has the first and second convex shapes of the flange portion. Since it is heat-sealed in an annular shape at the upper end of the part, when cooking with a microwave oven, the lid body bulges outward due to an increase in internal pressure in the packaging container, and the lid body peels off at the first convex part, It is possible to release the internal pressure that has risen through the through hole. In addition, since the lid is formed of a plastic material, even if the packaging container or the contents are cooled after cooking, the lid that bulges outward and is plastically deformed is supported by the second convex portion. Thus, it is possible to prevent sticking to the first convex portion and to prevent the container from being crushed due to the negative pressure inside due to the smooth intake of the outside air through the through hole.

  According to the microwave packaging container of claim 7, in addition to the effect of the microwave packaging container of claim 5 or 6, the height of the upper end of the first convex portion in the flange portion is the second. Since the height of the upper end of the convex portion is lower than that, even if the packaging container and the contents are cooled after cooking, the lid that bulges outward and is plastically deformed becomes difficult to stick to the first convex portion, Smooth intake of outside air through the through hole can more reliably prevent the container from being crushed due to negative pressure inside.

  According to the microwave packaging container of claim 8, in addition to the effects of the microwave packaging container of claims 5 to 7, the heat seal strength between the first convex portion and the lid is Since it is smaller than the heat seal strength between the convex part of 2 and the lid, when cooking with a microwave oven, while holding the heat seal of the lid in the second convex part, The lid can be peeled off more reliably.

  According to the microwave packaging container of the ninth aspect, in addition to the effects of the microwave packaging container of the fifth to eighth aspects, the first convex portion is one of the first convex portions. Since the portion has an overhanging portion that protrudes toward the inside of the container body at the flange portion, when cooking with a microwave oven, the peeling stress on the lid due to the increased internal pressure is caused by the first convex portion. Concentrating on the overhanging portion, the lid can be easily peeled off from the first convex portion starting from the overhanging portion, and the relief pressure can be more reliably performed.

A first embodiment of the present invention will be described with reference to FIGS. 1 to 3, A is a microwave packaging container according to the present invention, and the microwave packaging container A is schematically represented by a container body 1.
And the lid body 2.

  As shown in FIG. 1, the container main body 1 contains the contents b such as food, and is provided with a flange portion 15 on the periphery of the opening of the container main body 1. A first convex portion 11 formed so as to partially protrude in the circumferential direction of the flange portion 15, and a portion in the circumferential direction of the flange portion 15 outside the first convex portion 11 on the upper surface of the flange portion 15. The second convex portion 12 formed to project and the flange portion 15 provided at the portion of the flange portion 15 that does not project between the first convex portion 11 and the second convex portion 12 It has one or two or more through holes 16 penetrating vertically (in FIG. 1, two through holes 16, 16 are illustrated).

The container body 1 is made of a polyethylene, polypropylene, polystyrene, polyester, polycarbonate or polystyrene resin, or a blend thereof, or a composite layer of these materials and a polyvinyl alcohol copolymer. The shape is, for example, formed in a box shape as shown in FIG.

As shown in FIGS. 2A and 2B, the first convex portion 11 and the second convex portion 12 described above are provided substantially parallel to the inner edge of the flange portion 15, for example, Flange portion 15 of container body 1
A part of the container body 1 is molded so as to have a convex shape upward when the container body 1 is molded.
The heights of the first and second convex portions 11 and 12 are set to 0. 0 with respect to the base portion of the flange portion 15.
It is preferable to project about 5 mm to 3.0 mm, and the width of the gap between the first convex portion 11 and the second convex portion 12 is about 1.5 mm to 4.5 mm. The dimension in the width direction of the flange portion 15 of the through hole 16 in this gap is preferably about 1.0 mm to 4.0 mm.

As shown in FIG. 2 (b), the shape of the first and second convex portions 11 and 12 may be substantially horizontal in the upper end, but is shown in FIG. 2 (c). As described above, the first convex portion 1
The shape of the upper end of 1 is a shape that curves upward in the width direction of the flange portion 15, and the shape of the upper end of the second convex portion 12 is substantially horizontal. Good.
Further, as shown in FIG. 1, both end portions in the circumferential direction of the first and second convex portions 11 and 12 are provided with inclined surfaces, respectively, and upper ends of the first and second convex portions 11 and 12. It is preferable that the upper surface of the flange portion 15 is continuously heat-sealed with the lid body 2 without a step. Furthermore, the shape of the through-hole 16 can be various shapes such as a circular shape and a slot shape in plan view as long as gas (water vapor and air) is smoothly distributed.

The aforementioned lid 2 closes the opening of the container body 1, and as shown by hatching in the flange portion 15 of the container body 1 in FIG. Annularly heat-sealed in the circumferential direction of the flange portion 15 through the upper end of the second convex portion 12, and between the flange portion 15 and the portion of the lid body 2 facing the flange portion 15 at the opening portion An annular seal band 30a including the upper end of the first convex portion 11 and the upper end of the second convex portion 12 in the heat seal region is formed along the upper surface of the flange portion 15, and the first convex portion 11 and 2
The portion of the flange portion 15 that does not protrude between the convex portion 12 is not heat-sealed, and a non-sealed portion 30b that is not heat-sealed is formed in a part of the annular seal band portion 30a. The periphery of the non-seal part 30b is in the heat seal region of the annular seal band part 30a, and the above-described through hole 16 is provided in the flange part 15 where the non-seal part 30b is located.

The lid 2 is formed of a plastic material so that it can be plastically deformed. For example, the biaxially stretched polypropylene film, biaxially stretched 6 nylon film, biaxially stretched polyethylene terephthalate film, unstretched polypropylene or unstretched polyester Or a base material made of a composite film thereof, preferably the innermost layer (flange portion 15) of the base material.
On the other hand, for example, a layer in which an easy-to-peel sealant film as disclosed in JP-A-4-94933 is laminated can be used. This sealant film layer and the above-described upper surface portion of the flange portion 15 are heat-sealed to seal the inside of the container body 1, and the heat seal strength is, for example, about 5 to 50 KPa in terms of internal pressure strength. In addition, you may provide a sealant film layer in the flange part 15 side.

Next, the operation of the microwave packaging container A according to the embodiment of the present invention configured as described above will be described with reference to FIG. In FIG. 3, (a) shows a state before cooking, in which the first convex portion 11 and the lid body 2 and the second convex portion 12 and the lid body 2 are heat-sealed, respectively. The contents b in the range packaging container A are blocked from the outside air by the annular seal band 30a.

And when this microwave packaging container A is put in a microwave oven (not shown) and cooking is started, as shown in FIG. Water vapor is released by heating, and air or an inert gas or the like contained in the container body 1 is heated to expand and the lid is shown by an arrow due to an increase in internal pressure in the container body 1 as shown by an arrow. The body 2 bulges outward to separate a part of the annular seal band 30a (see FIG. 3C), and a gap S is formed between the lid 2 and the first convex portion 11. Then, it is electrically connected to the outside air through the peeled site (gap S) and the through hole 16, and the gas (water vapor, air, inert gas, etc.) in the container body 1 is released to the outside (see arrow d1). ).

And after completion | finish of heating cooking, the content b and the packaging container A for microwave ovens cool, and the gas in the container main body 1 will shrink | contract, and will be in a pressure reduction state. Here, the lid body 2 is formed of a plastic material, and the lid body 2 is supported by a portion of the annular seal band portion 30a that is held in an outward shape and is not peeled. The body 2 is prevented from blocking the through-hole 16, and as shown in FIG. 3D, outside air is taken into the container body 1 through the gap S and the through-hole 16 (arrow d).
2). Therefore, even if the inside of the container body 1 is in a reduced pressure state, it is possible to prevent the microwave packaging container A from being crushed and deformed by the external pressure (atmospheric pressure) due to the intake of outside air.

And as shown in FIG.3 (e), if the edge part of the cover body 2 is picked with a finger and it peels from the container main body 1, the cooked content b can be taken out.

Next, a second embodiment of the present invention will be described with reference to FIG. 4 with the same reference numerals assigned to the same parts as those of the first embodiment described above. In the second embodiment, the first convex portion 11 and the second convex portion 12 of the first embodiment described above are annularly formed in the circumferential direction of the flange portion. Since the material, the configuration and the operation related to the material and shape of the lid 2 are the same as those in the first embodiment, detailed description thereof is omitted.

In the second embodiment, as shown in FIG. 4, the container body 1 includes a first convex portion 11 ′ formed to project annularly in the circumferential direction of the flange portion 15 on the upper surface of the flange portion 15, and On the upper surface of the flange portion 15, a second convex portion 12 ′ formed outside the first convex portion 11 ′ and projecting annularly in the circumferential direction of the flange portion 15, and the first convex portion 11 ′. And the second convex part 12
One or two or more through-holes 16 that are provided in a portion of the flange portion 15 that does not protrude between and vertically penetrate the flange portion 15, and the lid body 2 includes the first and second of the flange portion 15. Each of the convex portions 11 ′ and 12 ′ is heat-sealed in an annular shape (see hatched portions in FIG. 4).

And between the flange part 15 and the site | part of the cover body 2 which opposes this flange part 15, the some cyclic | annular seal part heat-sealed cyclically along the opening part of the container main body 1 is formed. The annular seal portion includes a first annular seal portion 31 including the upper end of the first convex portion 11 ′ in the heat seal region, and the second convex portion 12 located outside the first annular seal portion 31. 'Has a second annular seal portion 32 including the upper end in the heat seal area. Further, the through hole 16 is provided at a portion located between the first annular seal portion 31 and the second annular seal portion 32 of the flange portion 15.

By the way, the shape and heat seal strength of the first convex portions 11 and 11 ′ and the second convex portions 12 and 12 ′ described above can be employed in the manner described below. That is, as shown in FIGS. 5A and 5B, the height L1 of the upper ends of the first convex portions 11 and 11 ′ in the flange portion 15 is set to the height of the upper ends of the second convex portions 12 and 12 ′. It is good also as a structure made lower than height L2. In the microwave packaging container A having this configuration, the height L1 of the upper ends of the first convex portions 11 and 11 ′ is lower than the height L2 of the upper ends of the second convex portions 12 and 12 ′. As shown in FIG.5 (c), the clearance gap S formed by peeling of the cover body 2 can be made still wider, and even if the microwave packaging container A and the contents b are cooled after cooking, the outer side Lid 2 bulging and plastically deformed
Is more difficult to stick to the first convex portions 11 and 11 ′ and more reliably prevent the container body 1 from being crushed due to a negative pressure in the container body 1 due to the smooth intake of outside air through the through-hole 16. it can.

In addition, while holding the heat seal of the lid 2 at the second convex portions 12 and 12 ′, the first
In the convex portions 11, 11 ′, the heat seal strength between the first convex portions 11, 11 ′ and the lid body 2 is set to the second convex shape so that the lid body 2 can be peeled off more reliably. You may make it smaller than the heat seal intensity | strength of the part 12, 12 'and the cover body 2. FIG.

Further, as shown in FIGS. 6A, 6B, and 6C, the first convex portions 11 and 11 ′ are configured such that a part of the first convex portions 11 and 11 ′ is a flange portion. 15 may have a projecting portion h that projects toward the inside of the container body 1. By providing this overhanging portion h, when cooking with a microwave oven, the peeling stress on the lid 2 due to the increased internal pressure causes the first convex portion 11 to be peeled off.
, 11 ′ is concentrated on the inner end P of the overhanging portion h, and the lid 2 is easily peeled off from the first convex portions 11 and 11 ′ starting from the inner end P of the overhanging portion h. It is possible to reliably release the pressure and further prevent the packaging container from bursting or spilling due to cooking in the microwave oven.

By the way, in the microwave oven packaging container A of the first and second embodiments described above, the first convex portions 11, 11 ′ and the second convex portions 12, 12 ′ are provided. As shown in FIGS. 7 (a) and 7 (b), the flange portion 15 is not provided with the first convex portions 11, 11 ′ and the second convex portions 12, 12 ′. A non-seal part 40b that does not heat seal is provided along the circumferential direction of the flange part 15, and the flange part 15 and the lid 2 are provided on both sides of the non-seal part 40b.
The seal portions 40a and 40a for heat sealing are provided, or as shown in FIGS. 7C and 7D, the recess portion 13 is provided in the flange portion 15 along the circumferential direction of the flange portion 15. The part is a non-sealed portion 40b that is not heat-sealed, and flange portions 15 are provided on both sides of the recess 13.
Seal portions 40a and 40a for heat-sealing the lid 2 and the lid 2 may be provided.

It is the figure which showed the packaging container for microwave ovens which concerns on the 1st Example of this invention. 2A and 2B are enlarged partial views of FIG. 1, in which FIG. 2A is a plan view in which a part of the lid is broken, and FIG. 2B is a cross-sectional view taken along line XX in FIG. FIG. 2 (c) shows a modified example of FIG. 2 (b). It is the partially expanded sectional view which showed the state change from the cooking container A for microwave ovens of FIG. 1 before cooking to the time of opening, FIG.3 (a) is the state before cooking, FIG.3 (b) is FIG. FIG. 3 (c) shows the state during cooking, the state in which the lid is peeled off from the first convex part during cooking, and FIG. 3 (d) shows the state in which outside air is taken in during cooling after cooking. FIG. 3 (e) shows the state at the time of opening. It is the figure which showed the packaging container for microwave ovens concerning the 2nd Example of this invention. It is the figure which showed the modification of this invention, and is a fragmentary figure of the site | part corresponding to the K section of FIG. 1, Fig.5 (a) is a top view which fractured | ruptured a part of cover body, FIG.5 (b). Is a cross-sectional view taken along line YY in FIG. 5A, and FIG. 5C is a view after the lid in FIG. 5B is peeled off at the first convex portion. . It is the figure which showed the other modification of this invention, Comprising: It is the fragmentary figure which expanded a part of packaging container A for microwave ovens, FIG.6 (a) is the perspective view which removed the cover body, FIG.6 (b) ) Is a plan view in which a part of the lid is broken at L part in FIG. 6A, and FIG. 6C is a cross-sectional view taken along line ZZ in FIG. 6B. It is the figure which showed the further modification of this invention, Comprising: It is the fragmentary figure which expanded a part of the packaging container A for microwave ovens, Fig.7 (a) is a 1st and 2nd convex-shaped part in a flange part. 7 (b) is a sectional view of FIG. 7 (a), and FIG. 7 (c) is a perspective view when a recess is provided in the flange portion. FIG. 7 (d) shows a cross-sectional view of FIG. 7 (c).

A Packaging container b for microwave oven Contents h Overhang portion S Clearance 1 Container body 2 Lid 11, 11 ′ First convex portion 12, 12 ′ Second convex portion 15 Flange portion 16 Through hole 30a Annular seal Band part 30b Non-seal part 31 First annular seal part 32 Second annular seal part 40a Seal part 40b Non-seal part

Claims (9)

A container body that contains contents inside and has a flange on the periphery of the opening;
A lid formed of a plastic material that is heat-sealed to the flange portion and closes the opening;
An annular seal band between the flange portion and a portion of the lid opposite the flange portion and heat-sealed annularly along the opening;
A part of this annular seal band part is formed with a non-seal part that does not heat seal, and the periphery of this non-seal part is in the heat seal area of the annular seal band part,
A through-hole that vertically penetrates the flange portion is provided in the flange portion where the non-seal portion is located,
Before cooking, the contents are cut off from the outside air by the annular seal band,
During cooking with a microwave oven, the lid body bulges outward due to an increase in internal pressure in the container body, and a part of the annular seal band is peeled off, and the peeled portion and the through hole are interposed. The lid is supported by the part of the annular seal band that is not peeled off and is connected to the outside air,
A crushing prevention method for a packaging container for a microwave oven, wherein after the heating cooking is finished, the shape bulging outside the lid body is held to prevent the lid body from closing the through hole. A first convex portion formed in a part of the upper surface of the flange portion so as to partially protrude in the circumferential direction of the flange portion;
A second convex portion formed on the upper surface of the flange portion, outside the first convex portion and partially protruding in the circumferential direction of the flange portion;
The through hole is provided in a portion of the flange portion that does not protrude between the first convex portion and the second convex portion,
The annular seal band is a heat seal area including the upper end of the first convex portion and the upper end of the second convex portion,
2. The microwave oven according to claim 1, wherein the non-seal portion is provided at a portion of the flange portion that does not protrude between the first convex portion and the second convex portion. How to prevent crushing of packaging containers. A container body that contains contents inside and has a flange on the periphery of the opening;
A lid formed of a plastic material that is heat-sealed to the flange portion and closes the opening;
A plurality of annular seal portions that are heat-sealed annularly along the opening between the flange portion and a portion of the lid that faces the flange portion;
The plurality of annular seal portions include a first annular seal portion and a second annular seal portion located outside the first annular seal portion,
Providing a through-hole penetrating the flange portion up and down at a portion located between the first annular seal portion and the second annular seal portion of the flange portion;
Before cooking, the contents are cut off from the outside air by the first annular seal portion,
When cooking with a microwave oven, the lid is bulged outward by an increase in internal pressure in the container body to peel off the first annular seal portion, and through the peeled portion and the through hole Conducting with the outside air and holding the seal of the second annular seal portion to support the lid body by the second annular seal portion,
A crushing prevention method for a packaging container for a microwave oven, wherein after the heating cooking is finished, the shape bulging outside the lid body is held to prevent the lid body from closing the through hole. A first convex portion formed annularly in the circumferential direction of the flange portion on the upper surface of the flange portion; and an outer side of the first convex portion on the upper surface of the flange portion in the circumferential direction of the flange portion. A second convex portion formed to project in an annular shape,
The through hole is provided in a portion of the flange portion that does not protrude between the first convex portion and the second convex portion,
The first annular seal portion is a heat seal region including the upper end of the first convex portion, and the second annular seal portion is a heat seal region including the upper end of the second convex portion. The method for preventing collapse of the packaging container for microwave oven according to claim 3. A container body that contains contents inside and has a flange on the periphery of the opening;
A lid formed of a plastic material that closes the opening of the container body,
The container main body includes a first convex portion formed to partially protrude in a circumferential direction of the flange portion at a part of the upper surface of the flange portion, and an outer side of the first convex portion at the upper surface of the flange portion. The second convex part formed so as to partially project in the circumferential direction of the flange part, and the flange not projecting between the first convex part and the second convex part One or two or more through-holes that are provided in a part of the portion and penetrate the flange portion up and down,
The lid body is annularly heat-sealed in the circumferential direction of the flange portion via the upper ends of the first convex portion and the second convex portion on the upper surface of the flange portion, and on the upper surface of the flange portion. And the portion between the first convex portion and the second convex portion is not heat-sealed,
When cooking with a microwave oven, the lid body bulges outward due to an increase in internal pressure in the container body, the lid body peels off at the first convex portion, and the internal pressure rises through the through hole. To release pressure,
A packaging container for a microwave oven, wherein the lid body bulging outward and plastically deformed is supported by the second convex portion and is prevented from sticking to the first convex portion. A container body that contains contents inside and has a flange on the periphery of the opening;
A lid formed of a plastic material that closes the opening of the container body,
The container main body is formed on the upper surface of the flange portion so as to project annularly in the circumferential direction of the flange portion, and on the upper surface of the flange portion, on the outer side of the first convex portion, and Provided at a portion of the flange portion that protrudes annularly in the circumferential direction of the flange portion, and a portion of the flange portion that does not protrude between the first convex portion and the second convex portion One or two or more through holes penetrating the flange portion up and down,
The lid is heat-sealed annularly at the upper ends of the first and second convex portions of the flange portion,
When cooking with a microwave oven, the lid body bulges outward due to an increase in internal pressure in the container body, the lid body peels off at the first convex portion, and the internal pressure rises through the through hole. To release pressure,
The microwave oven packaging container, wherein the lid body bulging outwardly and plastically deformed is supported by the second convex portion and is prevented from sticking to the first convex portion. The packaging container for a microwave oven according to claim 5 or 6, wherein the height of the upper end of the first convex portion in the flange portion is lower than the height of the upper end of the second convex portion. The heat seal strength between the first convex portion and the lid body is smaller than the heat seal strength between the second convex portion and the lid body, according to any one of claims 5 to 7. Packaging for microwave ovens. The first convex portion has a projecting portion in which a part of the first convex portion projects toward the inside of the container main body at the flange portion. The packaging container for microwave ovens of any one of Claims 1.

Images