JP2015196520A - Container for microwave oven, and package for microwave oven - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a container for a microwave oven, enabling narrowing a gap between a flange part to put content into and a lid material while retaining a function of automatically discharging steam, and a package for a microwave oven.SOLUTION: A container for a microwave oven 20 includes a heat-seal part 40 to be heat-sealed to a lid material in a flange part 30. The heat-seal part 40 includes an opening part 41, and a steam discharge part 42 formed so as to open in a nearly V shape toward an outer periphery 30a side of the flange part 30 from an opening 22 side in a plain view. Furthermore, the heat-seal part 40 includes an annular part 43 as a part excluding the opening part 41 and the steam discharge part 42, formed along a base line L having a nearly similar shape as the inner peripheral shape of the opening 22. A pair of end parts 42b of the outer periphery 30a side of the steam discharge part 42 is arranged at the outer periphery 30a side than the base line L, and is connected to an end part 43a of the annular part 43 through a pair of the inclination parts 45.

Description

  The present invention relates to a microwave oven container and a microwave oven package.

  Conventionally, various technologies have been proposed for a microwave oven container (see, for example, Patent Document 1).

  Patent Document 1 discloses a microwave cooking packaging container in which a peripheral seal portion is formed over the entire circumference of a flange portion of a synthetic resin container body, and a lid member is heat-sealed to the peripheral seal portion. The The peripheral seal portion is provided with a V-shaped or U-shaped protrusion toward the inside (opening side) of the container. According to this microwave cooking packaging container, when the moisture in the contents is heated in the microwave oven and the internal pressure rises, the lid is pushed up, and a part of the pushed up lid is automatically peeled off from the protruding portion. To do. Thereby, the sealing property of the container is lost, and the vapor in the container is discharged to the outside. Therefore, the user does not need to open the lid before setting the microwave oven.

  By the way, in this microwave oven cooking packaging container, an annular portion that follows the inner peripheral shape of the opening of the container is formed in a portion of the peripheral seal portion excluding the protruding portion for steam discharge. In the flange portion, a gap where the flange portion and the lid member are not heat-sealed is formed in a range from the annular portion to the opening. The contents can enter the gap. In consideration of a decrease in the appearance of the flange portion due to the contents, such a gap is preferably formed narrowly. For this reason, it is desirable that the annular portion is disposed at a position close to the opening of the container.

  However, in the peripheral seal part disclosed in Patent Document 1, the protruding part for discharging steam is formed so as to protrude from the annular part to the opening side. For this reason, the annular portion is inevitably formed at a position away from the opening of the container body by an amount corresponding to the protruding amount of the protruding portion. Therefore, it is difficult to arrange the annular portion near the opening of the container, and it is necessary to take some measures.

JP 2008-290738 A (FIG. 7)

  The present invention has been made in view of such circumstances, and an object of the present invention is to maintain a function of automatically discharging steam when the contents are heated in a microwave oven, and a flange portion into which the contents enter. An object of the present invention is to provide a microwave oven container and a microwave oven packaging body that can form a narrow gap between the lid and the lid.

The present invention is grasped by the following composition.
(1) A container for a microwave oven of the present invention has a container body that is formed in a concave shape and can accommodate contents, and an annular flange portion that is formed in a bowl shape in the opening at the upper end of the container body, and is in the form of a film The container for a microwave oven is sealed by closing the opening with a lid material, and the flange portion is formed in a rib shape over the entire circumference of the upper surface of the flange portion and is heat-sealed to the back surface of the lid material An unsealed portion formed so as to open in a substantially V shape from the outer peripheral side of the flange portion toward the opening side in a plan view, and the outer periphery from the opening side in a plan view. A steam discharge portion formed so as to open in a substantially V shape toward the side, and a portion of the heat fusion portion excluding the unsealing portion and the steam discharge portion, and an annular shape that is substantially similar to the inner peripheral shape of the opening An annular portion formed along the reference line, and a pair of end portions on the outer peripheral side of the steam discharge portion, 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) In the microwave oven container of the present invention, in the configuration of (1) above, the annular portion is disposed at a position less than 50% of the width of the flange portion from the opening, and the pair of end portions of the steam discharge portion are It arrange | positions in the position of 50% or more of the width | variety of a flange part from opening.

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

(4) The microwave oven container according to the present invention is characterized in that, in any of the configurations (1) to (3), the steam discharge portion and the inclined portion are connected so as to be angular toward the outer peripheral side. .

(5) In the microwave oven container according to the present invention, in any one of the configurations (1) to (4), the container body has a plurality of storage portions for storing the contents, and a plurality of steam discharge portions. A plurality of accommodating portions are provided corresponding to each of the accommodating portions.

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

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

  According to the present invention, when heating the contents in the microwave oven, while maintaining the function of automatically discharging the vapor, the microwave oven container capable of forming a narrow gap between the flange portion and the lid material into which the contents enter, and A microwave oven package 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.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention (hereinafter referred to as “embodiments”) will be described in detail with reference to the accompanying drawings. The same number is attached | subjected to the same element through the whole description of embodiment.

(Whole structure of microwave oven packaging 10)
First, the whole structure of the microwave packaging body 10 is demonstrated based on FIG.
As shown in FIG. 1, the packaging body 10 for microwave ovens (henceforth "the packaging body 10") of embodiment preserve | saves the contents 11 in the sealed state. The package 10 includes a microwave oven container 20 (hereinafter referred to as “container 20”) and a film-like lid member 12 that seals the container 20 by closing the opening 22 of the container 20.

  The contents 11 are various foods and the like, and any kind can be used as long as they are heated using a microwave oven.

(Configuration of the cover 12)
Next, the configuration of the lid member 12 will be described with reference to FIG.
As shown in FIG. 2, the outer shape of the lid member 12 is formed along the outer shape of the container 20. The lid member 12 is composed of a single layer film or a multilayer film. At least the back surface of the lid member 12 is made of a synthetic resin (for example, a polyolefin resin typified by polyethylene) that can be heat-sealed to a heat-sealing portion 40 (described later) of the container 20.

(Configuration of container 20)
Next, the structure of the container 20 is demonstrated based on FIGS.
As shown in FIG. 3 (a), the container 20 is formed in a bowl shape in a tray-like container body 21 that is formed in a concave shape and can accommodate the contents 11, and an opening 22 at the upper end of the container body 21. The flange portion 30 is provided.

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

  The flange portion 30 includes an annular base portion 31 formed with a substantially constant width along the inner peripheral shape of the opening 22, and a pair of gripping portions 32 protruding outward from the base portion 31. The base 31 includes a pair of linear portions 33 that are opposed to each other with the center of the container body 21 interposed therebetween, and a pair of arc-shaped portions 35 that are opposed to each other in a direction orthogonal to the opposing direction of the pair of linear portions 33. Become. Each gripping portion 32 is formed at a side end of the arc-shaped portion 35. Further, a heat fusion part 40 is formed on the base 31 of the flange part 30 over the entire circumference of the upper surface of the base 31.

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

  More specifically, by pressing a heated metal seal bar from above against the lid member 12 placed on the heat-sealing portion 40, the contact surface between the heat-sealing portion 40 and the lid member 12 is changed. Heat-sealed. The heat fusion strength on 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 fusion part 40, the material of the lid member 12, and the like. It is adjusted to an appropriate size according to the required sealing strength.

  On the other hand, the packaging body 10 is also required to have an easy opening property (easy peel property) for easily peeling off the cover material 12. In order to obtain easy-openability, it is effective to provide a portion that is not heat-sealed on the contact surface between the heat-sealing portion 40 and the lid member 12. For example, the back surface of the lid member 12 is made of low-density polyethylene, and the heat-sealed 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 | fusion part 40 and the cover material 12, the part heat-sealed and the part which is not heat-sealed can be provided.

  As shown in FIG. 4, the heat fusion part 40 is a steam discharge provided in the center of each of the unsealed part 41 formed in the center of the pair of arcuate parts 35 and the pair of linear parts 33. Part 42. An annular portion 43 is formed in a portion of the heat fusion portion 40 excluding the opening portion 41 and the steam discharge portion 42.

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

  The opening part 41 formed in this way has a function of satisfactorily peeling the lid member 12 when opening the package 10 taken out from the microwave oven. That is, when the edge portion 12a (see FIG. 1) of the lid member 12 is picked up by hand and pulled up in the grip portion 32 (FIG. 1, arrow (1)), stress is applied to the end portion 41a on the outer periphery 30a side of the opening portion 41. In order to concentrate, the cover material 12 peels favorably from the opening portion 41 toward the pair of end portions 41b on the opening 22 side starting from the end portion 41a on the outer periphery 30a side.

  As shown in FIG. 5A, the annular portion 43 is formed along an annular reference line L that is substantially similar to the inner peripheral shape of the opening 22. Further, the annular portion 43 is located at a position less than 50% of the width W of the flange portion 30 (width of the flange portion 30 in the direction orthogonal to the tangent to the opening 22) W from the opening 22, that is, the center in the width direction of the flange portion 30. It arrange | positions at the opening 22 side rather 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 portion 30, more preferably at the boundary portion (0%) between the opening 22 and the flange portion 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 after the microwave oven heating and the lid member 12 is expanded. Since the annular portion 43 is close to the opening 22 in the fused portion of the material 12 and the flange portion 30, the gap between the flange portion 30 and the lid material 12 is shallow, and steam can be prevented from entering the gap. As a result, stress in a direction in which the flange 30 and the lid member 12 are peeled off is concentrated on the tip of the substantially V-shaped steam discharge portion 42 (end portion 42a on the opening side). It can be surely peeled off preferentially and the steam can be discharged to the outside. The annular portion 43 (reference line L) is, for example, at a position of less than 50% with respect to the width W, preferably at a position of less than 15%, more preferably at the opening 22 and the flange portion at all positions of the flange portion 30. It is desirable to form it at 30 boundary portions (0%), but in addition, at least at a position of 80% of the entire length of the annular portion 43, a position of less than 50% with respect to the width W, preferably less than 15%. It can also be formed at the position, more preferably at the boundary portion (0%) between the opening 22 and the flange portion 30. Further, for example, the width W of the flange portion 30 is set in the range of 5 to 16 mm, and the distance from the opening 22 of the flange portion 30 to the annular portion 43 is set in the range of 0 to 8 mm, preferably in the range of 0 to 2.4 mm. preferable.

  Each vapor discharge part 42 is formed to open in a substantially V shape from the opening 22 side toward the outer periphery 30a side in a plan view. Further, the end portion 42 a on the opening 22 side of the steam discharge portion 42 is disposed slightly closer to the opening 22 than the reference line L in the width direction of the flange portion 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 42 b on the outer periphery 30 a side is disposed at a position that is 50% or more of the width W of the flange portion 30 from the opening 22, that is, closer to the outer periphery 30 a side than the center C <b> 1 in the width direction of the flange portion 30. . And a pair of edge part 42b by the side of the outer periphery 30a is connected via the pair of inclination part 45 to the two edge parts 43a of the cyclic | annular part 43 arrange | positioned at the both sides of the steam discharge part 42. FIG.

  In this example, a configuration in which the steam discharge portion 42 and the inclined portion 45 are formed in a curved shape is shown, but the steam discharge portion 42 and the inclined portion 45 may be formed in a substantially linear shape. The opening angle of the end 42a of the steam discharge part 42, the angle formed by the steam discharge part 42 and the inclined part 45, and the size of the angle formed by the annular part 43 and the inclined part 45 can be arbitrarily set.

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

(Effect of embodiment)
The effects of the embodiment described above will be described.
In the present embodiment, in the heat fusion part 40, the pair of end parts 42 b on the outer periphery 30 a side of the steam discharge part 42 are arranged on the outer periphery 30 a side with respect to the reference line L. In addition, 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 body 21 while ensuring the necessary depth d1 of the steam discharge portion 42.

  Here, let us consider a case where the pair of end portions of the steam discharge portion and the end portions 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 fusion part 100 according to this comparative example, the pair of end parts 101 a of the steam discharge part 101 are arranged at substantially the same position as the annular part 103 in the width direction of the flange part 102. . That is, the pair of end portions 101 a of the steam discharge portion 101 and the end portion 103 a of the annular portion 103 are directly connected without providing an inclined portion. In the heat fusion part 100 configured as described above, the annular part 103 is necessarily positioned away from the opening 106 of the container main body 105 by an amount corresponding to the depth d1 of the steam discharge part 101. For this reason, the distance P3 from the opening 106 to the annular portion 103 becomes longer. As a result, the gap into which the contents enter on the upper surface of the flange portion 102 is widened.

  In this regard, in the heat-sealed portion 40 shown in FIG. 5A, the annular portion 43 can be disposed close to the opening 22 of the container main body 21, so that the distance P1 from the opening 22 to the annular portion 43 is shortened. Can do. Therefore, according to the present embodiment, the gap into which the contents 11 enter can be narrowly formed on the upper surface of the flange portion 30 while maintaining the function of automatically discharging the steam by the steam discharge portion 42.

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

(First modification)
In the above-described heat-sealing part 40 (see FIG. 5A), the end part 42a on the opening 22 side of the steam discharge part 42 is shown on the opening 22 side slightly from the reference line L. The position of the end portion on the opening side of the “steam discharge part” can be arbitrarily changed.

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

  According to this heat fusion part 40A, since the end part 42a on the opening 22 side of the steam discharge part 42A is arranged on the reference line L, the annular part 43 can be arranged at the opening 22. Thereby, the distance P2 from the opening 22 to the annular portion 43 can be further shortened. Therefore, the gap into which the contents 11 enter on the upper surface of the flange portion 30 can be further narrowed.

(Second modification)
In the above-described heat-sealing part 40 (see FIG. 5A), the example in which the steam discharge part 42 and the inclined part 45 are smoothly connected is shown, but the corner part formed by the steam discharge part 42 and the inclined part 45 is shown. The form of can be arbitrarily changed.

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

  In the heat fusion part 40B, the steam discharge part 42B and the pair of inclined parts 45B are connected in a substantially M shape, whereby a pair of opening parts 41B are formed on both sides of the steam discharge part 42B. Each of the pair of opening portions 41B is formed so as to open in a substantially V shape from the outer periphery 30a side to the opening 22 side in a plan view. Thereby, the multi-function part 51 which has a vapor | steam discharge function and an opening function can be provided in the flange part 30 in a space-saving manner.

  In this multi-function part 51, since the steam discharge part 42B and the inclined part 45B are connected so as to be angular, the depth d2 becomes relatively large. Thus, it is preferable to provide the multi-function part 51 with the large depth d2 in the part formed in the flange part 30 comparatively wide.

  For example, like the container 20 </ b> C shown in FIG. 8, a multi-function part 51 having both a steam discharge function and an opening function can be provided in each of the pair of gripping parts 32 in a space-saving manner. Or as shown to Fig.9 (a) and (b), when the external shape of container 20D is a square shape (for example, substantially rectangular shape), at least 1 corner part among the some corner parts 52 of the flange part 30 is shown. In 52, the multi-function part 51 can be provided in a space-saving manner. Thus, by integrating the multi-function part 51 having both the steam discharge function and the opening function in the grip part 32 and the corner part 52, the widths W1, W2 of the other parts of the flange part 30 can be formed narrower. . As a result, more compact containers 20C and 20D can be obtained.

(Other configuration examples of containers)
Next, another configuration example of the container will be described with reference to 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 the overlapping description is abbreviate | omitted.

  In the container 20 (see FIG. 4) described above, the container main body 21 having one storage portion for storing the contents 11 is shown. However, the “container main body” referred to in the present invention has a plurality of storage portions. It may be a thing.

  For example, as shown in FIG. 10, in the container 20 </ b> E, the container main body 21 </ b> E has two accommodating portions 53. These two accommodating portions 53 are partitioned by a partition wall 55. On the upper surface of the partition wall 55, a connecting portion 56 that connects the opposing portions of the annular portion 43 is formed. The two accommodating parts 53 are sealed by heat-welding a lid member (not shown) to the heat-sealing part 40E including the connecting part 56.

  Furthermore, the heat-sealing part 40E has two vapor | steam discharge parts 42E arrange | positioned in the diagonal direction of the container 20E in planar view. These two steam discharge parts 42E are provided corresponding to the two accommodating parts 53, respectively. In each heat-sealing portion 40E, a pair of end portions 42b on the outer periphery 30a side of the steam discharge portion 42E is disposed on the outer periphery 30a side with respect to the reference line L. Moreover, the end part 42b of the steam discharge part 42E is connected to the end part 43a of the annular part 43 through the inclined part 45E.

  According to the container 20E configured as described above, the steam can be automatically discharged from each of the two storage parts 53 by the two steam discharge parts 42E, and the annular part is formed in the opening 22 of the container body 21E. 43 can be arranged close to each other.

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

  As mentioned above, although this invention was demonstrated using embodiment, it cannot be overemphasized that the technical scope of this invention is not limited to the range as described in the said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be added to the above embodiment. Further, it is apparent from the scope of the claims that the embodiments added with such changes or improvements can be included in the technical scope of the present invention.

  For example, in the embodiment, the heat fusion portions 40, 40A, 40B, and 40E are shown. However, the “heat fusion portion” referred to in the present invention may be an appropriate combination of these heat fusion portions 40A, 40B, and 40E. Good.

10 Packaging (Microwave packaging)
11 Contents 12 Cover material 20 Container (container for microwave oven)
20C container (container for microwave oven)
20D container (microwave oven container)
20E container (microwave oven container)
21 Container body 21E Container body 22 Opening 30 Flange part 30a Outer periphery 40 Thermal fusion part 40A Thermal fusion part 40B Thermal fusion part 40E Thermal fusion part 41 Unsealing part 41B Unsealing part 42 Steam discharge part 42a Opening end 42b A pair of end portions 42A on the outer peripheral side Steam discharge portion 42B Steam discharge portion 42E Steam discharge portion 43 Annular portion 43a End portion 45 Inclined portion 45B Inclined portion 45E Inclined portion 46 Boundary portion 53 Housing portion 55 Partition wall L Reference line W Flange portion width

Claims (7)

A container body formed in a concave shape and capable of accommodating contents; and an annular flange portion formed in a bowl shape at an opening at an upper end of the container body, the opening being closed by a film-like lid member A sealed microwave oven container,
The flange portion has a heat fusion portion that is formed in a rib shape over the entire circumference of the upper surface of the flange portion and is heat-sealed to the back surface of the lid member,
The heat fusion part is
An opening portion formed so as to open in a substantially V shape from the outer peripheral side of the flange portion toward the opening side in plan view;
A steam discharge portion formed so as to open in a substantially V shape from the opening side toward the outer peripheral side in plan view;
An annular portion formed along an annular reference line that is substantially similar to the inner peripheral shape of the opening and is a portion excluding the opening portion and the steam discharge portion of the heat fusion portion. ,
A pair of end portions on the outer peripheral side of the steam discharge portion is disposed on the outer peripheral side with respect to the reference line in the width direction of the flange portion, and the annular portion is disposed on both sides of the steam discharge portion. A container for a microwave oven, which is connected to an end portion through a pair of inclined portions. The annular portion is disposed at a position less than 50% of the width of the flange portion from the opening;
2. The microwave oven container according to claim 1, wherein the pair of end portions of the steam discharge portion is disposed at a position that is 50% or more of the width of the flange portion from the opening.   3. The microwave oven container according to claim 1, wherein an end of the vapor discharge portion on the opening side is disposed at a position through which the reference line passes.   The container for microwave oven according to any one of claims 1 to 3, wherein the steam discharge portion and the inclined portion are connected so as to be angular toward the outer peripheral side. The container body has a plurality of accommodating portions for accommodating the contents;
5. The microwave oven container according to claim 1, wherein a plurality of the steam discharge portions are provided corresponding to each of the plurality of storage portions. Two adjacent housing parts,
In the flange portion, a pair of gripping portions are formed opposite to each of the one housing portion side and the other housing portion side,
The steam discharge portion and the opening portion are formed in the grip portion and a pair of the opening portions are formed on both sides of the steam discharge portion to form a substantially M shape,
The container for a microwave oven according to claim 5, wherein a boundary portion of the annular portion is formed in a seal shape constricted along an opening shape of the two accommodating portions. A package for a microwave oven for storing contents in a sealed state,
A microwave oven package comprising: a film-like lid material; and the microwave oven container according to any one of claims 1 to 6 sealed by the lid material.

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