JP2017178430A - Container for microwave oven - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a container for microwave oven which adjusts a discharge amount of steam, suppresses a discharge sound at the time of discharge of the steam, and prevents stagnation of waterdrops, in such a structure as to further prevent leakage of a content.SOLUTION: A container 10 for microwave oven includes a container body 20 having an opening 21 in its upper part, a flange part 22 formed so as to extent to the outside from the opening 21 of the container body 20, and a first heat-welded portion 23B which is provided on the whole periphery of the upper surface of the flange part 22 and is heat-welded to a film-like lid material blocking the opening 21, where the first heat-welded portion 23B has an easily-peeling part 27 blocked toward the outside in plan view, and the easily-peeling part 27 is peeled from an outside tip part 27a.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a container for a microwave oven.

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

  Patent Document 1 discloses a sealed container having a peelable heat seal band for the purpose of automatically opening a part of the container by an increase in internal pressure due to expansion of steam or the like, and at least one of the heat seal bands. A technique is disclosed in which a portion is formed so as to protrude inward of the container, and an inner tip of the protrusion (inner convex V-shaped portion) is opened by an increase in internal pressure.

  However, with this technique, it is difficult to adjust the amount of discharged steam, and the progress of the peeling of the V-shaped part is fast, so that the steaming effect of the contents is reduced, or the distance from the inner end of the V-shaped part to the end of the lid However, there was a problem that a beep was generated when the steam was discharged. Further, since the peeling of the lid material is likely to be large, when the pressure is reduced after the vapor is discharged, the portion surrounded by the V shape from which the vapor is discharged is blocked by a water droplet or a film constituting the lid material. There is a problem that the container body is deformed by the reduced pressure.

JP-A-62-235080

  The present invention has been made in view of such circumstances, and an object thereof is to control the amount of steam discharged in a structure that can prevent the leakage of contents, and to suppress a beep during steam discharge. An object of the present invention is to provide a container for a microwave oven that prevents water droplets from staying.

The present invention is grasped by the following composition.
(1) A container for a microwave oven, having a container body having an opening at an upper part thereof, a flange part formed so as to extend outward from the opening of the container body, and an entire upper surface of the flange part A first heat-welded portion that is heat-welded to a film-like lid member that closes the opening, and the first heat-welded portion has an easily peelable portion that closes outward in a plan view. And the easy-peeling part is peeled off from the outer front end part.

(2) In the configuration of (1) above, a steam discharge portion is further formed at a position corresponding to the easily peelable portion on the outer peripheral side of the first heat welding portion, and the lid member is heated. A second heat welding portion to be welded is provided.

(3) In the configuration of (1) above, the first heat welding portion is formed in a rib shape.

(4) In the configuration of (2) above, the second heat-welded portion is formed in a rib shape.

(5) In any one configuration of (1) to (4) above, the easily peelable portion has the outer front end portion that is lower than the inner base portion.

(6) In any one configuration of the above (1) to (5), the easy-peeling portion is formed by a W-shaped portion that closes outward in a plan view.

(7) In the configuration of the above (6), the easily peelable portion has an inner center front end portion that is lower than the inner both base portions.

(8) In the configuration of (1) above, the first heat welded portion is formed in a band shape.

(9) In the configuration of (1) above, the second heat welded portion is formed in a band shape.

(10) In the configuration of any one of (1), (8), and (9), the easily peelable portion has the outer front end portion that is higher than the inner base portion.

(11) In any one of the configurations (1), (8), (9), and (10), the easy peeling portion is formed by a W-shaped portion that is closed outward in a plan view. .

(12) In the configuration of the above (11), the easily peelable portion has an inner center front end portion that is higher than the inner both base portions.

(13) In any one of the constitutions (1) to (12), the lid is further disposed at a position facing the outside of the steam discharge portion of the flange portion so as not to adhere to the inside of the container body during decompression. Protrusions that lock the material are provided.

  According to the present invention, in a structure that can prevent leakage of contents, a container for a microwave oven is provided that regulates the amount of steam discharged, suppresses a beep when steam is discharged, and prevents water droplets from staying. Can do.

It is a disassembled perspective view of the container for microwave ovens concerning 1st Embodiment of this invention. Similarly, it is a top view of a container main body. Similarly, it is a perspective view which expands and shows the vapor | steam discharge part and easy peeling part of a container main body. Similarly, it is a top view which expands and shows the vapor | steam discharge part and easy peeling part of a container main body. Similarly, it is sectional drawing which expands and shows typically the vapor | steam discharge part and easy peeling part of a container main body. Similarly, it is a figure which shows a mode that a vapor | steam is discharged | emitted. Similarly, it is a figure which shows a mode that a cover material is peeled by hand. It is sectional drawing which expands and schematically shows the vapor | steam discharge part and easy peeling part of a container main body corresponding to FIG. 5 about the container for microwave ovens concerning 2nd Embodiment of this invention. . It is a top view of the container main body which concerns on 3rd Embodiment of this invention. It is a top view of the container main body which concerns on 4th Embodiment of this invention. Similarly, corresponding to FIG. 5, it is sectional drawing which expands and shows typically the vapor | steam discharge part and easy peeling part of a container main body.

  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.

(First embodiment)
(Whole structure of microwave oven container)
First, the whole structure of the container for microwave ovens concerning 1st Embodiment is demonstrated based on FIG. As shown in FIG. 1, the microwave oven container 10 has an opening 21 and a container body 20 filled with the contents 11 from the opening 21, and a film-like lid member 50 that closes the opening 21 as main elements. To do. Both the container main body 20 and the lid member 50 are formed of a resin material. The contents 11 accommodated in the container body 20 are various foods and the like, and any kind can be used as long as they are heated using a microwave oven.

  The microwave oven container 10 has a flange portion 22, a second heat weld portion 23 </ b> A formed on the upper surface of the flange portion 22 and thermally welded to the lid member 50, and a first heat weld portion on the outer peripheral side thereof. 23B. Furthermore, the container 10 for microwave ovens is provided with the protrusion part 24 which latches the cover material 50 in the flange part 22. As shown in FIG. The second heat welding part 23A is provided with a steam discharge part 25, and the first heat welding part 23B is provided with an easy peeling part 27 (W-shaped part) at a position corresponding to the steam discharge part 25. Hereinafter, the structure of each part of the container 10 for microwave ovens is demonstrated based on FIGS. 1-3.

  As shown in FIG. 2, the container body 20 has a housing portion 20b having a bottom 20a. The accommodating portion 20b, the bottom 20a, and the opening 21 have a substantially quadrangular shape (in this example, a substantially square shape) with rounded corners in plan view.

  The flange portion 22 is formed to extend outward from the opening 21. The flange portion 22 is a portion outside the inner portion (hereinafter referred to as “inner portion 22a”) where the second heat weld portion 23A and the first heat weld portion 23B are provided, and the accommodating portion 20b. There are corners 22b at positions corresponding to the four corners. Each corner 22b is connected to the inner portion 22a via a step 22c, and is formed at a position one step lower than the inner portion 22a.

  In addition, the inner part 22a may be inclined downward with respect to the horizontal plane toward the extending end of the flange part 22 in anticipation of warpage during the molding of the container body 20 in advance. Such an inclination of the flange portion 22 can be formed in substantially the same manner on the entire circumference of the flange portion 22.

  Returning to FIG. As shown in FIG. 1, the lid member 50 has an outer periphery that is approximately the same size as the outer periphery of the flange portion 22. After the cover material 50 is filled with the contents 11 in the housing portion 20b, the lid member 50 is thermally welded (sealed) to the second heat welding portion 23A and the first heat welding portion 23B, thereby closing the opening 21 and housing the housing portion. 20b is sealed.

  As shown in FIG. 2, the second heat-welded portion 23 </ b> A has ribs except for the steam discharge portion 25 that is notched to discharge steam, out of the entire circumference of the upper surface of the inner portion 22 a of the flange portion 22. And is heat-welded to the lid member 50. In this example, the steam discharge portion 25 is provided in the vicinity of the inside of one corner portion 22 b of the flange portion 22.

  The first heat welded portion 23B is formed in a rib shape so as to form a recess 26 on the inner peripheral side of the second heat welded portion 23A, and is heat welded to the lid member 50. The first heat welding part 23 </ b> B is formed over the entire circumference of the upper surface of the inner part 22 a of the flange part 22. The first heat welding part 23 </ b> B is formed in a substantially quadrangular shape (substantially square in this example) so as to surround the opening 21 of the container body 20 on the upper surface of the inner part 22 a of the flange part 22. And this 1st heat welding part 23B has the W-shaped part 27 (easy peeling part) which goes outside in the position corresponding to the steam discharge part 25 (refer FIG. 3).

  Here, the first heat welding portion 23B may be formed at a position lower than the second heat welding portion 23A. Thus, when the lid member 50 is pressed against the second heat welded portion 23A and the first heat welded portion 23B from above with a seal bar (not shown), the seal bar is pressed against the first heat welded portion 23B. Since the pressure is smaller than the pressing force of the seal bar on the second thermal welding portion 23A, the welding strength with the lid member 50 in the first thermal welding portion 23B is the same as that of the lid member 50 in the second thermal welding portion 23A. It becomes lower than the welding strength. Thereby, when the container 10 for microwave ovens is heated with a microwave oven and the vapor | steam pressure in the accommodating part 20b rises and reaches | attains a predetermined pressure, the cover material 50 is rather than the sealing surface of 23 A of 2nd heat welding parts. First, it is peeled off at any location on the seal surface of the first heat welding portion 23B. That is, in the second heat welding portion 23A and the first heat welding portion 23B, when the vapor pressure in the housing portion 20b reaches a predetermined pressure, the sealing performance between the second heat welding portion 23A and the lid member 50 is achieved. Is maintained, while the sealing performance of the first heat-welded portion 23B and the lid member 50 is lost.

  Note that the welding strength in the first thermal welding portion 23B can be reduced by making the width of the first thermal welding portion 23B smaller than the width of the second thermal welding portion 23A. It is possible to make it lower than the strength.

  The concave portion 26 is formed in a groove shape between the second thermal welding portion 23A and the first thermal welding portion 23B, and the vapor pressure in the accommodating portion 20b reaches a predetermined pressure, so that the first thermal welding portion When 23B peels off from the cover member 50 at any location, it has a function of guiding the steam from the peeled location to the steam discharge section 25.

  The W-shaped portion 27 is formed in the W-shaped portion so as to close toward one corner 22b of the flange portion 22 (toward the outside) in plan view (see FIG. 2). In the present embodiment, as will be described later, when the microwave oven container 10 is heated in the microwave oven, the vapor escapes from both outer end portions 27a and 27a of the W-shaped portion 27 due to the increase in vapor pressure generated in the accommodating portion 20b. . Further, when the user peels the lid 50 from the W-shaped portion 27 by picking and pulling the end of the lid 50 (in this example, the corner 50a of the lid 50 shown in FIG. 1). However, since the force concentrates on the outer both ends 27a, 27a side of the W-shaped portion 27, the lid member 50 can be easily peeled even with a small force.

  In consideration of easy peeling of the lid member 50 in peeling due to an increase in vapor pressure or peeling by the user, at least the first heat welding portion 23B of the container body 20 and at least the back surface of the lid member 50 Is preferably a combination of materials that requires a small force for peeling. As a combination of easily peelable materials, for example, at least the first heat welding portion 23B of the container body 20 is made of a material obtained by mixing polyethylene (PE) and polypropylene (PP), and at least on the back surface of the lid 50. Can use a combination of different materials that can be welded, such as polyethylene (PE).

  Returning to FIG. As shown in FIG. 3, the protruding portion 24 is provided at a position on the corner portion 22 b and facing the outside of the steam discharge portion 25. The protrusion 24 has a conical base portion 24a that is disposed in the vicinity of the vapor discharge portion 25 and tapers upward, and a spherical surface portion 24b formed on the upper portion of the base portion 24a. A corner portion 50a (see FIG. 1) of the lid member 50 is heat-welded to the spherical surface portion 24b. The protrusion 24 functions to lock the corner portion 50a of the lid member 50 when the accommodating portion 20b is decompressed. By providing the protrusion 24 in the vicinity of the vapor discharge part 25, it is possible to further prevent the lid member 50 from adhering to the contents 11 when the accommodating part 20b is decompressed. The configuration of the protrusion 24 is not particularly limited to this example, and is arbitrary as long as the corner portion 50a of the lid member 50 can be locked when the accommodating portion 20b is decompressed.

(W-shaped part (easy peeling part))
The W-shaped portion 27 (easy peeling portion) will be described in more detail with reference to FIGS. FIG. 4 shows the W-shaped portion 27 in an enlarged manner, and the W-shaped portion 27 is grasped by being disassembled as follows. That is, the W-shaped portion 27 includes both outer front end portions 27a and 27a, an inner central front end portion 27b, inner inner base portions 27c and 27c, and outer central front end portions 27a and 27a and the inner central front end portion 27b. 27d, 27d, and both base end portions 27e, 27e connecting the both outer tip portions 27a, 27a and the inner both base portions 27c, 27c.

  As described above, the W-shaped portion 27 is inclined downward toward the outside in a side view, and as described above, even in the case of peeling due to an increase in vapor pressure generated in the accommodating portion 20b, Even in the case of peeling by hand, it is configured to peel from both outer end portions 27a and 27a. The details are as follows.

  In the W-shaped portion 27, as shown in FIG. 5, both outer tip portions 27a, 27a are set to be lower than the inner center tip portion 27b. The central side portions 27d and 27d connecting them are inclined downward toward the outside with an inclination angle θ1 with respect to the horizontal plane. With this configuration, when the lid member 50 is thermally welded to the flange portion 22 of the container main body 20, the outer both end portions 27a and 27a are heat-welded lighter than the inner center distal end portion 27b. , Easy to peel.

  Here, the inner center front end portion 27b may be the same height as or lower than the inner both base portions 27c and 27c. FIG. 5 shows an example in which the inner center front end portion 27b is lower than the inner both base portions 27c and 27c by the height h1. This is because the central side portions 27d and 27d are set shorter than the base side portions 27e and 27e, so that the inner center front end portion 27b is lower than the inner side base portions 27c and 27c. By setting the relative lengths of the central side portions 27d and 27d and the base side portions 27e and 27e in this way, the heat at the inner side base portions 27c and 27c, the inner center front end portion 27b, and the outer side front end portions 27a and 27a is set. It becomes possible to adjust the strength of welding. Note that the base both sides 27e and 27e are also inclined downward toward the outside with an inclination angle θ1 with respect to the horizontal plane, so the strength of thermal welding between the central both sides 27d and 27d and the base both sides 27e and 27e is different. Absent.

When the experiment was repeated while changing the inclination angle θ1 with respect to the sealing properties between the film constituting the cover member 50 and the central side portions 27d and 27d or the base side portions 27e and 27e, the following results were obtained. .

  Based on this result, by setting the inclination angle θ1 to 5.50 degrees or less, as described above, it is possible to obtain higher peelability than the other portions at the outer both end portions 27a and 27a of the W-shaped portion 27. it can.

(Function)
Then, the effect | action of the container 10 for microwave ovens is demonstrated based on FIG.6 and FIG.7. As shown in FIG. 6, when the microwave oven container 10 is heated in the microwave oven, the lid member 50 expands due to an increase in the vapor pressure generated in the housing portion 20 b. When the lid member 50 swells, as shown by an arrow (1) in FIG. 6, the peeled portion, that is, the vapor from the outer both end portions 27a and 27a is discharged from the vapor discharge portion 25 to the outside.

  Then, as shown by an arrow (2) in FIG. 7, the user picks up the corner 50a of the lid 50 corresponding to the steam discharge section 25, lifts it up, and lifts the lid 50 up to the protrusions 24 and W. It peels from the character part 27. At this time, since the W-shaped portion 27 is formed so as to close toward the outside, the user can start the peeling of the lid member 50 with a smaller force, and the lid member 50 can be easily removed from the container body 20. be able to.

(Effect of 1st Embodiment)
The effects of the first embodiment described above will be described. According to the first embodiment, both outer front end portions 27a, 27a of the W-shaped portion 27 (easy peeling portion) are first peeled off by the vapor pressure, and steam is discharged from the same location. Thereby, the spreading | diffusion of a vapor | steam is adjusted by the spreading | diffusion of peeling from the inner side to the outer side, and the steaming effect of the contents is maintained. Further, since the distance to the end of the lid member is short, the generation of a beep sound is suppressed when the steam is discharged. Further, when the pressure is reduced after the steam is discharged, the steam is discharged because the water droplets do not stay in the portion surrounded by the central V shape of the W shape, and the container body 20 is deformed by the steam filled inside. The effect of preventing can be produced.

(Second Embodiment)
Subsequently, a second embodiment of the present invention will be described with reference to FIG. In the second embodiment, in the W-shaped portion 27 (easy peeling portion) in the first embodiment, the height is reduced by the height h2 so that the inner center tip portion 27b is further lower than the inner both base portions 27c and 27c. It is a thing. In other words, the central side portions 27d and 27d that connect the outer both end portions 27a and 27a and the inner central tip portion 27b are more than the base both side portions 27e and 27e that connect the outer both tip portions 27a and 27a and the inner both root portions 27c and 27c. The gentle inclination angle θ2. With this configuration, when the lid member 50 is thermally welded to the flange portion 22 of the container body 20, heat welding is performed on the central side portions 27d and 27d and the base both side portions 27e and 27e sandwiching the outer end portions 27a and 27a. Since the strength of each can be further varied, the vapor pressure stress on the outer both ends 27a, 27a is more concentrated and is easily peeled off.

  Regarding the inclination angles θ1 and θ2, based on the results shown in Table 1, both the inclination angles θ1 and θ2 are set to 5.50 degrees or less, and the inclination angle θ2 is made smaller than the inclination angle θ1 within the range. Thus, as described above, it is possible to obtain higher peelability than the other portions at the outer both end portions 27a, 27a of the W-shaped portion 27.

(Third embodiment)
Then, the container main body which concerns on 3rd Embodiment of this invention is demonstrated based on FIG. In the third embodiment, the planar shape of the accommodating portion 20b is a substantially oval shape with rounded corners. As shown in FIG. 9, the container main body 70 includes an accommodating portion 20 b and an opening 21 whose planar shape is substantially rectangular. The flange portion 22 extending from the opening 21 is provided with a rib-like second heat welding portion 23A and a rib-like first heat welding portion 23B. And the 1st heat welding part 23B has the W-shaped part 71 formed in a W-shaped part so that it may block | close toward the outer side in the position corresponding to the vapor | steam discharge part 25 in planar view. The W-shaped portion 71 includes two outer tip portions 71a and 71a facing outward, one inner center tip portion 71b facing inward, and inner joint root portions 71c and 71c connected to the first heat welding portion 23B. Have.

  Similarly to the first and second embodiments, the W-shaped portion 71 is inclined downward (toward the outside) toward one corner 22b of the flange portion 22 in a side view. That is, both outer tip portions 71a and 71a are set lower than the inner center tip portion 71b, and the inner both base portions 71c and 71c are set higher than the inner center tip portion 71b. The corresponding relationship is the same as the corresponding relationship between the outer both ends 27a and 27a, the inner center tip 27b, and the inner bases 27c and 27c in the first and second embodiments (FIGS. 5 and 8). reference). By this inclination, it is possible to set the welding strength at the outer both end portions 71a and 71a of the W-shaped portion 71 to be smaller than the other portions.

  When the user picks up the lid member 50 and lifts the lid member 50 away from the W-shaped portion 71 so as to pull it up, the force is applied to at least one of the two outer end portions 71a and 71a of the W-shaped portion 71. By concentrating, the lid member 50 can be easily peeled even with a small force. Further, when the lid 50 is automatically opened due to an increase in vapor pressure, the stress concentrates on the outer both ends 71a and 71a of the W-shaped portion 71, so that peeling is more likely to occur. Thereby, similarly to 1st Embodiment and 2nd Embodiment, the discharge amount of a vapor | steam is adjusted by the spreading | diffusion of peeling from the inner side to the outer side, and the steaming effect of the content is maintained. Is done. Further, since the distance to the end of the lid member is short, the generation of a beep sound is suppressed when the steam is discharged. Further, when the pressure is reduced after the steam is discharged, the steam is discharged because the water droplets do not stay in the portion surrounded by the central V shape of the W shape, and the container body 20 is deformed by the steam filled inside. The effect of preventing can be produced.

  In the third embodiment, as in the first embodiment and the second embodiment, the first heat welding portion 23B is formed at a position lower than the second heat welding portion 23A, or the first heat welding portion 23B is formed. The width of the welded portion 23B can be formed smaller than the width of the second heat welded portion 23A. Thereby, the welding strength of the 1st heat welding part 23B can be set much lower than the welding strength of 23 A of 2nd heat welding parts.

(Fourth embodiment)
Next, the container main body 80 which concerns on 4th Embodiment of this invention is demonstrated based on FIG.10 and FIG.11. In the fourth embodiment, the second heat welding portion 81A and the first heat welding portion 81B in the second embodiment are changed from a rib shape to a belt shape. As shown in FIG. 10, the container main body 80 has an accommodating portion 20 b and an opening 21 whose planar shape is substantially rectangular. The flange portion 22 extending from the opening 21 has a belt-like second heat welding portion 81A and a belt-like first heat welding portion 81B (both welding portions are flat portions shown by a dot pattern in FIG. 10). It is formed. That is, the second heat welded part 81A and the first heat welded part 81B are not rib-shaped, and a space (non-heated) through which steam can pass between the second heat welded part 81A and the first heat welded part 81B. It is formed in a flat shape as long as the welded portion 82) can be formed. Further, the first heat welding part 81B has a flat W-shaped part 71 that is closed outward at a position corresponding to the steam discharge part 25 in a plan view.

  The first heat welding part 81 </ b> B is formed in a belt shape by pressing the seal head 90 (hot plate) against the flange part 22 of the container body 80. The seal head 90 has a thickness (a lower height when viewed downward from the base line above the seal head 90) at a position corresponding to the W-shaped portion 71 (easy peeling portion) than a portion other than the W-shaped portion 71. It is configured. Specifically, as shown in FIG. 11, the W-shaped portion 71 is formed by using a heat-welding seal head 90 configured to correspond to the aspect of the W-shaped portion 71 of the second embodiment, for example. The Of course, it may correspond to the aspect of the W-shaped portion 27 of the first embodiment. In FIG. 11, the seal head 90 is described with reference numerals representing the W-shaped structure 71 ′ corresponding to the W-shaped portion 71. That is, the seal head 90 includes both outer tip portions 71a ′ and 71a ′, an inner center tip portion 71b ′, inner both root portions 71c ′ and 71c ′, outer both tip portions 71a ′ and 71a ′, and an inner center tip. Central side portions 71d 'and 71d' connecting the portion 71b 'and base both side portions 71e' and 71e 'connecting the both outer tip portions 71a' and 71a 'and the inner both base portions 71c' and 71c '. . By pressing the seal head 90 against the flat upper surface of the flange portion 22 through the lid member 50, a W-shaped portion 71 welded to the lid member 50 is formed on the upper surface of the flange portion 22.

  By pressing the seal head 90 against the flange portion 22, the W-shaped portion 71 is formed so as to have both outer end portions 71a and 71a that are weaker in heat welding strength than the inner both-side root portions 71c and 71c. Moreover, it forms so that it may have the inner center front-end | tip part 71b in which the intensity | strength of heat welding is weaker than the inner both base parts 71c and 71c. That is, the W-shaped portion 71 of the fourth embodiment is formed in a manner that the W-shaped structure 71 ′ of the seal head 90 is inverted up and down.

  That is, the central side portions 71d and 71d connecting the outer both end portions 71a and 71a and the inner center tip portion 71b are inclined upward toward the outside with an inclination angle θ2 with respect to the horizontal plane. By comprising in this way, when the lid | cover material 50 is heat-welded to the flange part 22 of the container main body 20, both outer front-end | tip parts 71a and 71a will be heat-welded lightly rather than the inner center front-end | tip part 71b. , Easy to peel.

  And in order to make it easier to peel the outer both ends 71a, 71a, the base both sides 71e, 71e connecting the outer both tips 71a, 71a and the inner both roots 71c, 71c are inclined with respect to the horizontal plane θ1. It is inclined upward toward the outside. The inclination angle θ1 is configured to be larger than the inclination angle θ2 of the central side portions 71d and 71d. With this configuration, when the lid member 50 is thermally welded to the flange portion 22 of the container body 20, heat welding is performed at the central both side portions 71d and 71d and the base both side portions 71e and 71e sandwiching the both outer end portions 71a and 71a. Since the strengths of the two are different, the stress of the vapor pressure with respect to the outer both ends 71a and 71a is further concentrated, and it becomes easy to peel off.

  Thereby, similarly to 1st Embodiment and 2nd Embodiment, the discharge amount of a vapor | steam is adjusted by the spreading | diffusion of peeling from the inner side to the outer side, and the steaming effect of the content is maintained. Is done. Further, since the distance to the end of the lid member is short, the generation of a beep sound is suppressed when the steam is discharged. Further, when the pressure is reduced after the steam is discharged, the steam is discharged because the water droplets do not stay in the portion surrounded by the central V shape of the W shape, and the container body 20 is deformed by the steam filled inside. The effect of preventing can be produced.

(Modification)
In the first embodiment to the fourth embodiment, the easy-peeling portion is configured by the W-shaped portion 27 or the W-shaped portion 71 that closes outward in a plan view. It is not limited to the W-shaped portion (including the V-shaped portion having one outer distal end portion) that is pointed outward like the distal end portions 27a, 27a or both outer distal end portions 71a, 71a. In addition to this, for example, even if the easy-peeling portion is configured by a U-shaped portion that closes outward, and the outer end portion is formed in an arc shape, the same effects as those of the embodiments can be obtained.

(Conclusion)
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-described embodiments. Further, it is apparent from the description of the scope of claims that embodiments with such changes or improvements can also be included in the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 10 ... Container 11 for microwave ovens ... Contents 20 ... Container main body (1st Embodiment, 2nd Embodiment)
21 ... Opening 22 ... Flange part 23A ... Second heat welding part (first embodiment, second embodiment)
23B ... 1st heat welding part (1st Embodiment, 2nd Embodiment)
24 ... Projection part 25 ... Steam discharge part 26 ... Concave part 27 ... W-shaped part (easy peeling part) (1st Embodiment, 2nd Embodiment)
27a ... Both outside tips 27b ... Inside center tip 27c ... Inside both roots 50 ... Lid 70 ... Container body (third embodiment)
71 ... W-shaped part (easy peeling part) (3rd Embodiment, 4th Embodiment)
71a ... Both front ends (third and fourth embodiments)
71b ... inner center front end portion (third embodiment, fourth embodiment)
71c ... Inner side root part (3rd Embodiment, 4th Embodiment)
80 ... Container body (fourth embodiment)
81A ... 2nd heat welding part (4th Embodiment)
81B ... 1st heat welding part (4th Embodiment)
82 ... Non-thermal welding part 90 ... Seal head (hot plate)

Claims (13)

A container for a microwave oven,
A container body having an opening at the top;
A flange portion formed to extend outward from the opening of the container body;
A first heat welding portion provided on the entire circumference of the upper surface of the flange portion and thermally welded to a film-like lid member that closes the opening;
The first heat welded portion has an easy peeling portion that closes toward the outside in a plan view,
The microwave oven container, wherein the easy peeling portion peels from an outer front end portion thereof.   In addition, a vapor discharge portion is provided at a position corresponding to the easily peelable portion on the outer peripheral side of the first heat weld portion, and a second heat weld portion that is heat welded to the lid member is provided. The container for microwave ovens of Claim 1 characterized by the above-mentioned.   The container for microwave oven according to claim 1, wherein the first heat welding portion is formed in a rib shape.   The container for microwave oven according to claim 2, wherein the second heat-welded portion is formed in a rib shape.   The container for microwave oven according to any one of claims 1 to 4, wherein the easily peelable portion has the outer front end portion lower than the inner base portion.   The microwave oven container according to any one of claims 1 to 5, wherein the easy peeling portion is formed by a W-shaped portion that is closed outward in a plan view.   The container for microwave oven according to claim 6, wherein the easily peelable portion has an inner center front end portion lower than an inner base portion.   The container for microwave oven according to claim 1, wherein the first heat welding portion is formed in a band shape.   The container for microwave oven according to claim 2, wherein the second heat-welded portion is formed in a band shape.   10. The microwave oven container according to claim 1, wherein the easily peelable portion has the outer front end portion whose strength of heat welding is weaker than that of the inner base portion.   11. The microwave oven container according to any one of 1, 8, 9, and 10, wherein the easy peeling portion is formed by a W-shaped portion that is closed outward in a plan view.   The container for microwave oven according to claim 11, wherein the easily peelable portion has an inner central tip portion whose strength of heat welding is weaker than that of the inner base portion. Furthermore, the protrusion part which latches the said cover material so that it may not adhere to the inside of the said container main body at the time of pressure reduction is provided in the position facing the outer side of the said vapor | steam discharge | emission part of the said flange part. The container for a microwave oven according to any one of 12.

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