JP6500269B2 - Packaging for microwave oven - Google Patents

Description

  The present invention relates to a container for a microwave and a package for the microwave.

  Conventionally, various techniques have been proposed for containers for microwave ovens (see, for example, Patent Document 1).

  Patent Document 1 discloses a microwave oven cooking packaging container in which a peripheral seal portion is formed over the entire circumference of a flange portion of a container body made of synthetic resin, and a lid material is thermally fused to the peripheral seal portion. Ru. The peripheral seal portion is provided with a V-shaped or U-shaped protruding portion directed to the inside (opening side) of the container. According to the packaging container for microwave oven cooking, when the moisture of the contents is heated in the microwave oven and the internal pressure rises, the lid material is pushed up, and a part of the pushed-up lid material is automatically peeled off from the projection Do. Thereby, the sealability of the container is lost, and the vapor in the container is discharged to the outside. Therefore, the user does not have to open the lid before setting it in the microwave.

  By the way, in this packaging container for microwave oven cooking, an annular portion along the inner circumferential shape of the opening of the container is formed in the peripheral seal portion excluding the protruding portion for discharging steam. In the range from the annular portion to the opening in the flange portion, a gap in which the flange portion and the lid member are not thermally fused is formed. It is possible for the contents to enter this gap. It is preferable that such a gap be formed narrow in consideration of the appearance deterioration of the flange portion due to the contents. For this reason, it is desirable that the annular portion be disposed close to the opening of the container.

  However, in the peripheral seal portion disclosed in Patent Document 1, the projection for vapor discharge is formed to project from the annular portion toward the opening side. For this reason, the annular portion is inevitably formed at a position apart from the opening of the container body by an amount corresponding to the amount of protrusion of the protrusion. Therefore, it is difficult to arrange the annulus near the opening of the container, and some measures need to be taken.

JP 2008-290738 A (FIG. 7)

  This invention is made in view of such a situation, The objective is the flange part which the contents enter, maintaining the function which discharges steam automatically, when heating the contents with a microwave oven It is providing the container for microwave ovens, and the package body for microwave ovens which can form narrow gap with a cover material.

The present invention is grasped by the following composition.
(1) A container for a microwave oven according to the present invention has a container body which is formed in a concave shape and can accommodate the contents, and an annular flange portion which is formed in a bowl shape at the opening of the upper end of the container body. The container for a microwave oven which is sealed by closing the opening with the lid member, and the flange portion is formed like a rib over the entire circumference of the upper surface of the flange portion and heat-sealed to the back surface of the lid member An unsealed portion having a heat sealing portion, and the heat sealing portion is formed so as to open in a substantially V shape from the outer peripheral side to the opening side of the flange portion in plan view, and the outer circumference from the opening side in plan view A steam discharge portion formed so as to open in a substantially V-shape toward the side, and a heat-sealed portion excluding the unsealing portion and the steam discharge portion, and an annular shape substantially similar to the inner circumferential shape of the opening And an annular portion formed along the reference line, and a pair of ends on the outer peripheral side of the steam discharge portion are Than the reference line in the width direction of the flange portion is disposed on the outer peripheral side, and wherein the lead through a pair of inclined portions in the end portion of the annular portion disposed on opposite sides of the steam discharge part.

(2) The container for a microwave oven according to the present invention is characterized in that in the configuration of the above (1), the annular portion is disposed at a position less than 50% of the width from the opening to the flange portion, It is characterized by being arranged at a position of 50% or more of the width of the flange portion from the opening.

(3) The container for a microwave oven according to the present invention is characterized in that in the configuration of the above (1) or (2), the open end of the vapor discharge portion is disposed at a position through which the reference line passes.

(4) The container for a microwave oven according to the present invention is characterized in that, in the configuration of any one of the above (1) to (3), the steam discharge portion and the inclined portion are connected in an angular manner toward the outer peripheral side. .

(5) In the configuration of any of the above (1) to (4), in the container for a microwave oven of the present invention, the container main body has a plurality of storage sections for storing the contents, and the steam discharge section has a plurality of It is characterized in that it is provided in a plurality corresponding to each of the housing portions.

(6) The container for a microwave oven according to the present invention has the two adjacent housing portions in the configuration of the above (5), and the flange portion is relative to each of the one housing side and the other housing side. A pair of gripping portions are formed facing each other, and the steam discharging portion and the unsealing portion are formed in the gripping portion and a pair of unsealing portions are formed on both sides of the steam discharging portion to form a substantially M shape. It is characterized in that the boundary portion of the annular portion is formed in a seal shape which is recessed along the opening shape of the two accommodating portions.

(7) A package for a microwave oven according to the present invention is a package for a microwave oven for storing contents in a sealed state, which is sealed by a film-like lid and a lid. And the microwave oven container according to any one of the above.

  According to the present invention, when heating the contents with the microwave, the container for the microwave can be formed with a narrow gap between the flange part into which the contents enter and the lid material while maintaining the function of automatically discharging the steam, and A package for a microwave oven is provided.

It is a perspective view of the packaging body for microwave ovens of embodiment which concerns on this invention. It is a top view of the package for microwave ovens shown by FIG. (A) is the sectional view on the AA line of FIG. 2, (b) is the B section enlarged view of (a). It is a top view of the container for microwave ovens shown by FIG. (A) is the C section enlarged view of FIG. 4, (b) is a figure which shows the comparative example of (a). It is explanatory drawing of the heat sealing | fusion part which concerns on a 1st modification, and is a figure corresponding to Fig.5 (a). It is explanatory drawing of the heat sealing | fusion part which concerns on a 2nd modification, and is a figure corresponding to Fig.5 (a). It is a figure explaining the usage example of the heat sealing | fusion part which concerns on a 2nd modification, and is a top view of the container for microwave ovens. It is a figure explaining the other usage example of the heat sealing | fusion part which concerns on a 2nd modification, (a) is a top view of the container for microwave ovens, (b) is the P section enlarged view of (a). It is a top view which shows the other structural example of the container for microwave ovens. It is a top view which shows the other structural example of the container for microwave ovens.

  Hereinafter, with reference to the accompanying drawings, modes for carrying out the present invention (hereinafter, referred to as “embodiments”) will be described in detail. Like numbers refer to like elements throughout the description of the embodiments.

(Whole structure of package 10 for microwave oven)
First, the entire configuration of the microwave packaging body 10 will be described based on FIG.
As shown in FIG. 1, a package 10 for a microwave oven (hereinafter, referred to as “package 10”) of the embodiment stores the contents 11 in a sealed state. The package 10 includes a container 20 for a microwave oven (hereinafter, referred to as “container 20”), and a film-like lid 12 for closing the opening 22 of the container 20 to seal the container 20.

  The contents 11 are various foods and the like, and may be of any type as long as they are heated using a microwave oven.

(Composition of lid 12)
Next, the configuration of the lid 12 will be described based on FIG.
As shown in FIG. 2, the outer shape of the lid 12 is formed along the outer shape of the container 20. The lid 12 is composed of a single layer film or a multilayer film. At least the back surface of such a lid 12 is made of a synthetic resin (for example, a polyolefin resin represented by polyethylene, etc.) that can be heat-fused to the thermally fused part 40 (described later) of the container 20.

(Configuration of container 20)
Next, the structure of the container 20 will be described based on FIGS.
As shown in FIG. 3A, the container 20 has a tray-shaped container main body 21 formed in a concave shape and capable of containing the contents 11, and an annular shape formed in the opening 22 at the upper end of the container main body 21. And the flange portion 30 of

  As shown in FIG. 4, the container body 21 is formed to have a substantially oval outer shape in a plan view. The outer shape of the "container body" according to the present invention is not particularly limited to this example, and may be selected from various shapes such as a substantially rectangular shape, a substantially polygonal shape, a substantially circular shape, and the like. It is possible.

  The flange portion 30 has an annular base 31 formed to have a substantially constant width along the inner peripheral shape of the opening 22 and a pair of grips 32 projecting outward from the base 31. The base portion 31 includes a pair of linear portions 33 opposed to each other across the center of the container body 21 and a pair of arc-shaped portions 35 opposed in a direction orthogonal to the opposing direction of the pair of linear portions 33 Become. Each gripping portion 32 is formed at the side end of the arc-shaped portion 35. Furthermore, a heat sealing portion 40 is formed on the entire periphery of the upper surface of the base portion 31 at the base portion 31 of the flange portion 30.

  Return to FIG. As shown in FIG. 3 (b), the heat sealing portion 40 is formed in a rib shape so as to protrude upward from the upper surface of the base 31. At least the heat sealing portion 40 of the container 20 is made of a synthetic resin (for example, a polyolefin resin represented by polyethylene) that can be heat sealed to the back surface of the lid 12. The lid 12 is heat-sealed.

  More specifically, the contact surface of the thermally fused portion 40 and the lid member 12 is made by pressing the heated metal seal bar from above onto the lid member 12 placed on the thermally fused portion 40 Heat sealed. The heat sealing strength at the contact surface can be adjusted by changing the temperature of the seal bar, the time for pressing the seal bar, the material of the heat sealing portion 40, the material of the lid 12, etc. It is adjusted to an appropriate size according to the required sealing strength.

  On the other hand, the package 10 is also required to have an easy openability (easy peelability) to easily peel off the lid 12. In order to obtain easy openability, it is effective to provide a portion which is not thermally fused at the contact surface between the thermally fused portion 40 and the lid 12. For example, the back surface of the lid 12 is made of low density polyethylene, and the thermally fused portion 40 is made of a material in which polypropylene is mixed with low density polyethylene. Thereby, in the contact surface of the heat sealing part 40 and the lid 12, the part to be heat sealed and the part not to be heat sealed can be provided.

  As shown in FIG. 4, the heat-sealing portion 40 is provided with an unsealing portion 41 formed at the center of each of a pair of arc-shaped portions 35 and a steam discharge provided at each center of a pair of linear portions 33. And a unit 42. Further, an annular portion 43 is formed in a portion of the heat sealing portion 40 excluding the unsealing portion 41 and the steam discharging portion 42.

  Each unsealing portion 41 is formed to open in a substantially V shape from the outer periphery 30a side of the flange portion 30 to the opening 22 side in a plan view.

  The unsealing portion 41 formed in this manner has a function of causing the lid 12 to be peeled well when the package 10 taken out of the microwave oven is opened. That is, in the gripping portion 32, when the edge 12a (see FIG. 1) of the lid 12 is grasped by hand and pulled up (FIG. 1, arrow (1)), stress is applied to the end 41a on the outer periphery 30a side of the unsealing portion 41. In order to concentrate, the cover material 12 peels favorably from the unsealing portion 41 toward the pair of end portions 41 b on the opening 22 side starting from the end portion 41 a on the outer periphery 30 a side.

  As shown in FIG. 5A, the annular portion 43 is formed along an annular reference line L substantially similar in shape to the inner peripheral shape of the opening 22. As shown in FIG. Further, the annular portion 43 is located at a position less than 50% of the width W of the flange portion 30 (the width of the flange portion 30 in the direction perpendicular to the tangent of the opening 22) from the opening 22, that is, the width direction center of the flange portion 30 It is disposed closer to the opening 22 than C1. Preferably, the annular portion 43 is provided from the opening 22 at a position less than 15% of the width W of the flange 30, more preferably at the boundary (0%) between the opening 22 and the flange 30. When the annular portion 43 is located at a position less than 50% of the width W of the flange portion 30 from the opening 22, when the pressure in the container 20 increases so that steam is generated and the lid member 12 is expanded after microwave heating. Since the annular portion 43 is close to the opening 22 at the fusion-bonded portion of the material 12 and the flange portion 30, the gap between the flange portion 30 and the lid member 12 is shallow, and steam can be prevented from entering the gap. As a result, stress in the direction of peeling off the flange portion 30 and the lid member 12 concentrates on the tip (end portion 42 a on the opening side) of the substantially V-shaped steam discharge portion 42. It is possible to surely remove preferentially and to discharge the vapor to the outside. The annular portion 43 (reference line L) is, for example, at a position less than 50%, preferably less than 15%, of the width W at all the positions of the flange 30, preferably the opening 22 and the flange It is desirable to form at the boundary portion of 30 (0%), but in addition, at least 80% of the length of the annular portion 43, less than 50% of the width W, preferably less than 15% It can also be formed at the position, more preferably at the boundary (0%) of the opening 22 and the flange 30. Further, for example, the width W of the flange portion 30 may be set within the range of 5 to 16 mm, and the distance between the opening 22 of the flange portion 30 and the annular portion 43 may be set within the range of 0 to 8 mm, preferably 0 to 2.4 mm. preferable.

  Each steam discharge part 42 is formed to open in a substantially V shape from the opening 22 side toward the outer periphery 30 a side in a plan view. Further, the end 42 a on the opening 22 side of the steam discharge unit 42 is disposed slightly closer to the opening 22 than the reference line L in the width direction of the flange 30.

  On the other hand, the pair of end portions 42 b on the outer periphery 30 a side of the steam discharge portion 42 is disposed closer to the outer periphery 30 a than the reference line L in the width direction of the flange portion 30. In this example, the pair of end portions 42b on the outer periphery 30a side is disposed at a position at least 50% of the width W of the flange portion 30 from the opening 22, that is, closer to the outer periphery 30a than the width direction center C1 of the flange portion 30. . And a pair of end 42b by the side of perimeter 30a is connected via a pair of slope 45 with two ends 43a of annular part 43 arranged on both sides of steam discharge part 42.

  In addition, although the structure which formed the steam discharge part 42 and the inclination part 45 in curvilinear form is shown in this example, you may form the steam discharge part 42 and the inclination part 45 in substantially linear form. Further, the opening angle of the end 42 a of the steam discharge portion 42, the angle between the steam discharge portion 42 and the inclined portion 45, and the angle between the annular portion 43 and the inclined portion 45 can be set arbitrarily.

  In the vapor discharge unit 42 configured as described above, when the moisture of the content 11 (see FIG. 1) is heated by the microwave to increase the internal pressure and the lid 12 (see FIG. 1) is pushed up, it is pushed up. The cover 12 has a function of automatically peeling the edge 12a (see FIG. 1) of the lid 12. That is, in the steam discharge part 42, when the lid member 12 (see FIG. 1) is pushed up, stress concentrates on the end 42a on the opening 22 side of the steam discharge part 42, so the end 42a on the opening 22 side is the starting point The edge 12a (see FIG. 1) of the lid 12 is peeled off automatically. As a result, the sealing performance is lost, and the steam is exhausted from the steam discharge unit 42. The depth d1 of the steam discharge unit 42 is set to an appropriate size according to the required steam discharge function.

(Effect of the embodiment)
The effects of the embodiment described above will be described.
In the present embodiment, in the heat-sealing unit 40, the pair of end portions 42b on the outer periphery 30a side of the steam discharge unit 42 is disposed closer to the outer periphery 30a than the reference line L. Further, the pair of end portions 42 b on the outer periphery 30 a side of the steam discharge portion 42 is connected to the end portion 43 a of the annular portion 43 via the pair of inclined portions 45. Thereby, the annular portion 43 can be disposed close to the opening 22 of the container main body 21 while securing the necessary depth d1 of the steam discharge portion 42.

  Here, temporarily, a case will be considered in which a pair of ends of the steam discharging portion and an end of the annular portion are directly connected.

FIG.5 (b) is a figure which shows the comparative example of the heat sealing | fusion part 40 shown by Fig.5 (a).
As shown in FIG. 5B, in the heat-sealing unit 100 according to this comparative example, the pair of end portions 101a of the steam discharging unit 101 is disposed at substantially the same position as the annular portion 103 in the width direction of the flange portion 102. . That is, the pair of end portions 101 a of the steam discharge unit 101 and the end portion 103 a of the annular portion 103 are directly connected without providing the inclined portion. In the heat-sealing unit 100 configured as described above, the annular portion 103 is necessarily at a position apart from the opening 106 of the container main body 105 by an amount corresponding to the depth d 1 of the vapor discharge portion 101. Therefore, the distance P3 from the opening 106 to the annular portion 103 is increased. As a result, the gap in which the contents enter on the upper surface of the flange portion 102 is widened.

  In this respect, in the heat sealing portion 40 shown in FIG. 5A, since the annular portion 43 can be disposed close to the opening 22 of the container main body 21, the distance P1 from the opening 22 to the annular portion 43 should be shortened. Can. Therefore, according to the present embodiment, while the function of automatically discharging the steam by the steam discharging unit 42 is maintained, the gap in which the contents 11 enter can be formed narrow on the upper surface of the flange portion 30.

(Modified example of heat sealing part)
Then, the modification of a heat sealing | fusion part is demonstrated based on FIGS. 6-9.
FIG. 6 is an explanatory view of a heat sealing part according to a first modification, corresponding to FIG. 5 (a). FIG. 7 is an explanatory view of a heat sealing portion according to a second modification, corresponding to FIG. 5 (a). FIG. 8 is a view for explaining a usage example of the heat-sealing unit according to the second modification, and FIG. 9 is a view for explaining another usage example of the heat-sealing unit according to the second modification. In addition, the same code | symbol is attached | subjected to the element which is common in the heat sealing part 40 (refer Fig.5 (a)) mentioned above, and suppose that the overlapping description is abbreviate | omitted.

(First modification)
In the heat-sealing portion 40 (see FIG. 5A) described above, an example is shown in which the end 42a on the opening 22 side of the vapor discharge portion 42 is disposed slightly closer to the opening 22 than the reference line L. The position of the open end of the "steam outlet" can be arbitrarily changed.

  For example, as in the heat-sealing part 40A shown in FIG. 6, the end 42a on the opening 22 side of the vapor discharge part 42A may be disposed at a position where the reference line L passes.

  According to this heat-sealing part 40A, the end 42a on the opening 22 side of the vapor discharge part 42A is disposed on the reference line L, so the annular part 43 can be disposed at the time of the opening 22. Thereby, the distance P2 from the opening 22 to the annular portion 43 can be further shortened. Therefore, it is possible to further narrow the gap into which the contents 11 enter at the upper surface of the flange portion 30.

(2nd modification)
Although the example which connected the steam discharge part 42 and the inclination part 45 smoothly was shown in the heat sealing part 40 (refer Fig.5 (a)) mentioned above, the corner | angular part which the steam discharge part 42 and the inclination part 45 make is shown. The form of can be changed arbitrarily.

  For example, as in the heat-sealing part 40B shown in FIG. 7, the steam discharge part 42B and the inclined part 45B may be connected in an angular manner to the outer periphery 30a side of the flange part 30.

  In the heat-sealing unit 40B, a pair of unsealing portions 41B are formed on both sides of the vapor discharge portion 42B by connecting the vapor discharge portion 42B and the pair of inclined portions 45B in a substantially M shape. Each of the pair of unsealing portions 41B is formed to open in a substantially V shape from the outer periphery 30a side to the opening 22 side in plan view. Thereby, the multifunctional part 51 which has a steam discharge function and an opening function can be provided in the flange part 30 by space saving.

  In the multi-function part 51, the steam discharge part 42B and the inclined part 45B are connected in an angular manner, so the depth d2 becomes relatively large. Thus, it is preferable to provide the multifunctional portion 51 having a large depth d2 at a portion of the flange portion 30 which is formed relatively wide.

  For example, as in the case of a container 20C shown in FIG. 8, a multifunctional unit 51 having a steam discharging function and an opening function can be provided in each of the pair of grips 32 in a space-saving manner. Alternatively, as shown in FIGS. 9A and 9B, when the outer shape of the container 20D is rectangular (for example, substantially rectangular), at least one corner of the plurality of corners 52 of the flange portion 30 The multi-function unit 51 can be provided in the space 52 in 52. Thus, the widths W1 and W2 of the other portions of the flange portion 30 can be made narrower by consolidating the multifunctional portion 51 having both the steam discharging function and the opening function into the gripping portion 32 and the corner 52. . As a result, more compact containers 20C and 20D can be obtained.

(Other configuration example of container)
Next, another configuration example of the container will be described based on FIG. FIG. 10 is a plan view showing another configuration example of the container. In addition, the same code | symbol is attached | subjected to the element which is common in the container 20 (refer FIG. 4) mentioned above, and suppose that the overlapping description is abbreviate | omitted.

  Although the container 20 (see FIG. 4) described above shows the container main body 21 having one storage portion for storing the contents 11, the “container main body” according to the present invention further has a plurality of storage portions. It may be something.

  For example, as shown in FIG. 10, in the container 20E, the container body 21E has two accommodating portions 53. The two accommodating portions 53 are partitioned by the partition wall 55. A connecting portion 56 is formed on the upper surface of the partition wall 55 to connect between the facing portions of the annular portion 43. Each of the two accommodating portions 53 is sealed by thermally welding a lid (not shown) to the heat sealing portion 40E including the connection portion 56.

  Furthermore, the heat sealing part 40E has two steam discharge parts 42E arranged in the diagonal direction of the container 20E in plan view. These two steam discharge parts 42E are provided corresponding to each of the two accommodation parts 53. In each heat fusion bonding portion 40E, the pair of end portions 42b on the outer periphery 30a side of the vapor discharge portion 42E is disposed closer to the outer periphery 30a than the reference line L. Further, the end 42 b of the steam discharge portion 42 E is connected to the end 43 a of the annular portion 43 via the inclined portion 45 E.

  According to the container 20E configured as described above, the two steam discharge portions 42E can automatically discharge the steam from each of the two storage portions 53, and further, an annular portion is formed in the opening 22 of the container body 21E. 43 can be placed close.

  In addition, as shown in FIG. 11, the holding portions 32 which are a pair of wide portions face each other so as to face each of the one accommodating portion 53 side and the other accommodating portion 53 side of the two adjacent accommodating portions 53. You may form in the part 30. FIG. And on each holding part 32, the multifunctional part 51 which has a steam discharge function and an opening function can be provided. As described above, in the plan view, the multifunctional unit 51 is formed so as to open in a substantially V shape from the opening 22 side toward the outer periphery 30a side, and both the vapor discharge unit 42E The opening portion 41 is provided on the side and formed so as to open in a substantially V-shape from the outer periphery 30a side to the opening 22 side, and the whole is formed in a substantially M-shape. Furthermore, the boundary 46 of the annular portion 43 corresponding to the two accommodating portions 53 can be formed into a seal shape which is recessed along the opening shape of the two accommodating portions 53.

  Although the present invention has been described above using the embodiment, it goes without saying that the technical scope of the present invention is not limited to the scope described in the above embodiment. It is apparent to those skilled in the art that various changes or modifications can be added to the above embodiment. It is also apparent from the scope of the claims that the embodiments added with such alterations or improvements can be included in the technical scope of the present invention.

  For example, in the embodiment, the heat-fusion parts 40, 40A, 40B, and 40E are shown, but the "heat-fusion parts" in the present invention may be any combination of these heat-fusion parts 40A, 40B, and 40E. Good.

10 Packaging (package for microwave oven)
11 Contents 12 lid 20 container (container for microwave oven)
20C container (container for microwave oven)
20D container (container for microwave oven)
20E container (container for microwave oven)
21 container body 21E container body 22 opening 30 flange portion 30a outer periphery 40 heat sealing portion 40A heat sealing portion 40B heat sealing portion 40E heat sealing portion 41 opening portion 41B opening portion 42 steam discharging portion 42a opening end 42b A pair of ends 42A on the outer circumference side Steam discharge part 42B Steam discharge part 42E Steam discharge part 43 Annular part 43a End part 45 Sloped part 45B Sloped part 45E Sloped part 46 Boundary part 53 Housing part 55 Partition wall L Reference line W Flange part width

Claims (7)

A package for a microwave oven for storing contents in a sealed state, comprising:
Film-like lid material,
And a container for a microwave oven sealed by the lid .
The container for a microwave oven has a container body formed in a concave shape and capable of containing contents, and an annular flange portion formed in a bowl shape at the opening of the upper end of the container body,
The flange portion is formed in a rib shape over the entire circumference of the upper surface of the flange portion, and has a heat sealing portion heat sealed to the back surface of the lid member,
The heat-fusible portion,
A steam discharge portion formed so as to open in a substantially V shape toward the outer peripheral side of the flange portion from the opening side in a plan view;
A pair of unsealing parts which are formed so as to be continuous with both sides of the steam discharge part in a plan view and formed so as to open in a substantially V shape from the outer peripheral side toward the opening side;
And an annular portion which is a portion excluding the unsealing portion and the steam discharging portion in the heat-sealing portion and which is formed along an annular reference line substantially similar in shape to the inner circumferential shape of the opening.
The steam discharge portion and the pair of unsealing portions are substantially M-shaped, and their opening angles are all acute angles,
The pair of unsealing portions are formed by a pair of inclined portions.
The pair of ends on the outer peripheral side of the steam discharge portion are disposed on the outer peripheral side with respect to the reference line in the width direction of the flange portion,
An end portion of the annular portion disposed on opposite sides of the steam discharge portion and the end portion of the pair of inclined portions, connected bent to be convex toward the opening side,
The annular portion is disposed at a position less than 50% of the width of the flange portion from the opening;
The pair of end portions of the steam discharge portion is disposed at a position of 50% or more of the width of the flange portion from the opening,
The width of the flange portion is in the range of 5 to 16 mm,
The distance between the opening and the annular portion is in the range of 0 to 2.4 mm.   The package for a microwave oven according to claim 1, wherein the annular portion is disposed at a position of 80% or more of its entire length and less than 15% of the width of the flange portion from the opening.   The package according to claim 1 or 2, wherein the open end of the vapor discharge portion is disposed at a position through which the reference line passes.   The pair of the unsealing portions formed on both sides of the steam discharge portion and the steam discharge portion are substantially M-shaped, and the opening angles thereof are both acute angles. The package body for microwaves of any one of 3. The flange portion has a base and a grip having a larger width than the base;
The package body for a microwave oven according to claim 4, wherein a pair of the unsealing parts formed on both sides of the steam discharge part and the steam discharge part is provided on the grip part. The container body has a plurality of storage units for storing the contents;
A plurality of the steam discharge units are provided corresponding to each of the plurality of storage units,
The package for microwave ovens according to any one of claims 1 to 5, wherein a heat sealing portion is also used as a partition of the adjacent housing portion. It has two adjacent said accommodation parts,
The flange portion is formed with a pair of gripping portions so as to face each of the one accommodating portion side and the other accommodating portion side,
The steam discharge portion and the unsealing portion are formed in the grip portion and a pair of the unsealing portions are formed on both sides of the steam discharge portion to form a substantially M shape.
The package for a microwave oven according to claim 6, wherein a boundary portion of the annular portion is formed in a seal shape which is recessed along the opening shape of the two accommodating portions.

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