Packaging bag for microwave oven, packaging container for microwave oven, packaged food product, and cooking method for packaged food product

Abstract

Provided is a packaging bag for a microwave oven, which can be easily torn and opened even after being heated by the microwave oven. According to the present invention, provided is a packaging bag for microwave ovens in which a flexible film is formed into a bag shape, the packaging bag comprising the film formed by laminating a first substrate layer, a second substrate layer, and a sealing layer in this order via an adhesive layer, the packaging bag having a peripheral surface part constituting the peripheral surface of the bag shape, the packaging bag is characterized in that an unsealing part for unsealing the packaging bag by tearing the peripheral surface part is provided on the peripheral surface part, and an easy-to-tear process is performed on the entirety of the second base material layer and a part of the sealing layer at the unsealing part.

Description

Technical Field

[0001] The present invention relates to a packaging bag for a microwave oven in which a flexible film is formed into a bag shape, a packaging container for a microwave oven, packaged food, and a cooking method for the packaged food. Background Art

[0002] A packaging bag filled with contents such as soft cans is known, which can be heated in a microwave oven. For example, in the packaging bag disclosed in Patent Document 1, a cut-out steam release unit is provided on the upper part of the packaging bag in a self-standing state, and steam can be released from the steam release unit when heated in a microwave oven. Furthermore, the contents can be taken out by opening the packaging bag after heating.

[0003] Prior art literature Patent Literature Patent Document 1: Japanese Patent Application Publication No. 2005-306426 Summary of the invention Problem that the invention aims to solve (First point of view) In order to easily tear and open the packaging bag when taking out the contents, efforts have been made, for example, to form the packaging bag using a film having straight-cut properties. If the packaging bag is heated by a microwave oven, even with such efforts, it is difficult to tear the packaging bag straightly.

[0004] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a microwave packaging bag that can be easily torn and opened even after being heated in a microwave oven.

[0005] (Second and fourth viewpoints) When the contents are food, it is conceivable to use the packaging container as tableware after heating. When the food includes liquid (for example, when the food is instant noodles including liquid soup), high self-supporting stability is particularly required in order to prevent the contents from tipping over when eating.

[0006] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a packaging container which can be easily heated by a microwave oven while containing contents such as food, and which can be made self-standing after heating and used as tableware.

[0007] (Third point of view) As packaging bags become more multifunctional, the length of packaging bags in the height direction may become longer. For example, as described above, a packaging bag may be provided with a steam release unit, an opening and closing member for opening and closing the packaging bag, or a packaging bag may be used as tableware when eating the food in the packaging bag. In such a case, the packaging bag is large in volume and the packaging efficiency is low.

[0008] The present invention has been made in view of such circumstances, and an object of the present invention is to provide a packaging container that can be handled compactly even when the packaging bag is long in the height direction.

[0009] Means used to solve problems (First point of view) According to the present invention, the following inventions are provided.

[0010] [1] A packaging bag, which is a packaging bag for microwave ovens formed by forming a flexible film into a bag shape, wherein the film is composed of a first substrate layer, a second substrate layer and a sealing layer stacked in this order via an adhesive layer, the packaging bag has a peripheral surface portion constituting the peripheral surface of the bag shape, an opening portion is provided on the peripheral surface portion, the opening portion is used to open the packaging bag by tearing the peripheral surface portion, and at the opening portion, the entire second substrate layer and a part of the sealing layer are subjected to easy-tear processing.

[0011] [2] The packaging bag according to [1], wherein the easy-tear processing is perforation processing, At the unsealed portion, a hole is formed in which the entire second base material layer and a part of the sealing layer are cut in the thickness direction of the film.

[0012] [3] The packaging bag according to [2], wherein the perforations are formed by a plurality of cuts inclined relative to the tearing direction of the peripheral surface portion and arranged along the tearing direction.

[0013] [4] The packaging bag according to [2] or [3], wherein the perforations are formed such that, in the portion cut into the second base material layer, a recessed portion which is a part of the second base material layer enters the sealing layer in the thickness direction of the film.

[0014] [5] The packaging bag according to any one of [2] to [4], wherein the perforations are formed so as to cut into 5% to 80% of the thickness of the sealing layer in the thickness direction of the film.

[0015] [6] The packaging bag according to any one of [1] to [5], wherein the second substrate layer is composed of a stretched nylon film.

[0016] [7] The packaging bag according to any one of [1] to [6], wherein the peripheral surface portion is provided with a lower opening portion and an upper opening portion located above the lower opening portion as the opening portion.

[0017] [8] The packaging bag according to [7], wherein an opening and closing member is provided on the peripheral surface portion, The opening and closing member is configured to open and close an opening formed by opening the packaging bag at the upper opening portion.

[0018] (Effects of the Invention) The inventors of the present application discovered that by forming a packaging bag with a film in which a first substrate layer, a second substrate layer, and a sealing layer are laminated in this order via an adhesive layer, an easy-tear process is performed on the entire second substrate layer and a portion of the sealing layer at the opening portion for opening the packaging bag, thereby making it easy to tear the opening portion straightly even after being heated in a microwave oven, thereby completing the present invention.

[0019] (Second opinion) According to the present invention, the following inventions are provided.

[0020] [1] A packaging container for a microwave oven, comprising: a packaging bag formed of a flexible film into a bag shape, and an outer packaging body arranged to cover at least a portion of the outer surface of the packaging bag; the outer packaging body can be deformed into a self-supporting shape by expansion of the packaging bag when heated, and the bottom of the outer packaging body deformed into the shape is set as the lower side, so that the packaging container can be self-supporting.

[0021] [2] The packaging container according to [1], wherein the packaging bag has a steam release seal portion that forms a steam flow path as the internal pressure of the packaging bag increases.

[0022] [3] According to the packaging container described in [1] or [2], the packaging bag has a bottom portion, a front portion and a back portion, the front portion and the back portion are arranged to face each other and stand up from the bottom portion, and the bottom portion, the front portion and the back portion are welded to each other to form the bag shape.

[0023] [4] The packaging container according to any one of [1] to [3], wherein the outer packaging body has a reinforcement portion for maintaining the self-supporting shape.

[0024] [5] According to any one of [1] to [4], the outer packaging body has a front portion and a back portion which are arranged to face each other and stand up from the bottom, and the front portion and the back portion of the outer packaging body are respectively provided with protrusions that protrude outward from the outer packaging body due to expansion of the packaging bag when heated, and the packaging container is capable of being self-standing by grounding the protrusions with the bottom of the outer packaging body deformed into the shape as the lower side.

[0025] [6] According to any one of [1] to [4], an assembly portion assembled to close the bottom is provided at the bottom of the outer packaging body, and the outer packaging body is configured to be deformed in such a way that the assembly portion expands due to expansion of the packaging bag during heating, thereby forming the shape capable of being self-supporting.

[0026] [7] According to any one of [1] to [4], a folded portion folded inwardly of the outer packaging body is provided at the bottom of the outer packaging body, and the outer packaging body is configured to be deformed in such a way that the folded portion expands due to expansion of the packaging bag during heating, thereby forming the shape capable of standing on its own.

[0027] [8] According to any one of [1] to [4], an easy-to-open portion is provided at the bottom of the outer packaging body along the left-right direction, and the outer packaging body is configured so that the bottom expands in the front-to-back direction at the easy-to-open portion due to the expansion of the packaging bag during heating, thereby forming the shape capable of being self-supporting.

[0028] [9] According to any one of [1] to [4], the outer packaging body is configured to expand the bottom in the front-to-back direction and form an assembly part assembled to close the bottom due to the expansion of the packaging bag when heated, thereby deforming into the shape that can be self-supporting.

[0029]

[10] A packaged food comprising a food and the packaging container according to any one of [1] to [9], wherein the food is contained in the packaging bag.

[0030]

[11] The packaged food according to

[10] , wherein the food is instant noodles.

[0031]

[12] A method for cooking a packaged food, wherein the packaged food is the packaged food described in

[10] or

[11] , the method comprising a heating step and a self-standing step, wherein in the heating step, the packaged food is heated by a microwave oven while the outer packaging body is lying down, and in the self-standing step, the packaging container is made to stand on its own with the bottom of the outer packaging body as the lower side.

[0032]

[13] A method for cooking packaged food, comprising a housing step, a heating step and a self-standing step, wherein the packaged food comprises a packaging container and the food housed in the packaging container, wherein in the housing step, a cooking liquid is housed in the packaging container in contact with the food and the packaging container is sealed, wherein in the heating step, the food housed in the packaging container and the cooking liquid are heated by a microwave oven, and wherein in the self-standing step, the packaging container is made self-standing with its bottom side as the lower side, and wherein the packaging container comprises a steam release sealing portion that forms a steam flow path as the internal pressure of the packaging container increases.

[0033]

[14] The cooking method according to

[13] , wherein in the heating step, the food and the cooking liquid are heated by a microwave oven while the packaging container is lying down.

[0034]

[15] According to the cooking method described in

[13] or

[14] , the packaging container comprises: a packaging bag, which is formed into a bag shape by a flexible film, and an outer packaging body, which is configured to cover at least a portion of the outer surface of the packaging bag; the food is accommodated in the packaging bag, and the outer packaging body can be deformed into a self-supporting shape by the expansion of the packaging bag during heating in the heating step, and the bottom of the outer packaging body deformed into the shape is used as the lower side, so that the packaging container can be self-supporting.

[0035]

[16] The cooking method according to any one of

[13] to

[15] , wherein the food is instant noodles.

[0036] (Effects of the Invention) In the packaging container of the present invention, the outer packaging body can be deformed into a self-supporting shape by the expansion of the packaging bag during heating, and the bottom of the deformed outer packaging body can be used as the bottom side to make the packaging container self-supporting. Therefore, when food is contained as the content, the heated packaging container can be stably self-supporting and used as tableware.

[0037] (Third point of view) According to the present invention, the following inventions are provided.

[0038] [1] A packaging container, comprising: a packaging bag formed into a bag shape by a flexible film, and a packaging box in which the packaging bag is accommodated, the packaging bag having a bottom surface and a peripheral surface arranged to stand up from the bottom surface, the peripheral surface being longer than the length of the packaging box in the vertical direction of the packaging container, the peripheral surface having a folding portion of a predetermined length continuously arranged from the upper end, and the packaging bag being accommodated in the packaging box with the folding portion folded downward.

[0039] [2] The packaging container according to [1], wherein the peripheral surface portion has a steam release seal portion that forms a steam flow path as the internal pressure of the packaging bag increases, and the steam release seal portion is provided on the folded portion.

[0040] [3] The packaging container according to [1] or [2], wherein the peripheral surface portion has an opening portion that opens upward and an opening and closing member that is configured to open and close the opening portion, and the opening and closing member is provided on the folding portion.

[0041] [4] The packaging container according to any one of [1] to [3], wherein the difference between the length of the peripheral surface portion in the vertical direction of the packaging container and the length of the packaging box is 1 to 12 cm.

[0042] [5] According to any one of [1] to [4], the packaging box can be deformed into a self-supporting shape by the expansion of the packaging bag when heated, and the packaging container can be self-supporting with the bottom of the packaging box deformed into the shape as the lower side.

[0043] [6] A packaged food comprising a food and the packaging container according to any one of [1] to [5], wherein the food is contained in the packaging bag.

[0044] [7] The packaged food according to [6], wherein the food is instant noodles.

[0045] [8] A method for cooking packaged food, wherein the packaged food is the packaged food described in [6] or [7], the method comprising a containing step and a heating step, wherein in the containing step, a cooking liquid is contained in the packaging container in contact with the food and the packaging container is sealed, and in the heating step, the food contained in the packaging container and the cooking liquid are heated by a microwave oven.

[0046] (Effects of the Invention) The packaging container of the present invention comprises a packaging bag and a packaging box for accommodating the packaging bag, wherein the packaging bag is accommodated in the packaging box in a state where the folded portion of the upper end side of the packaging bag is folded downward. In such a structure, even a packaging bag in a height direction can be handled compactly.

[0047] (Fourth Viewpoint) According to the present invention, the following inventions are provided.

[0048] [1] A packaging container comprising: a packaging bag for a microwave oven, which is formed into a bag shape by a flexible film, and an outer packaging body, which is arranged to cover at least a portion of the outer surface of the packaging bag; the outer packaging body is deformed in a manner to form an opening portion opening downward at the bottom or at a position adjacent to the bottom during or after deformation, and can be deformed into a self-supporting shape, and the bottom of the outer packaging body deformed into the above shape is used as the lower side, so that the packaging container can be self-supporting.

[0049] [2] The packaging container according to [1], wherein the packaging bag has a steam release seal portion that forms a steam flow path as the internal pressure of the packaging bag increases.

[0050] [3] According to the packaging container described in [1] or [2], the packaging bag has a bottom portion, a front portion and a back portion, the front portion and the back portion are arranged to face each other and stand up from the bottom portion, and the bottom portion, the front portion and the back portion are welded to each other to form the bag shape.

[0051] [4] The packaging container according to any one of [1] to [3], wherein the outer packaging body has a reinforcement portion for maintaining the self-supporting shape.

[0052] [5] According to any one of [1] to [4], the outer packaging body has a front portion and a back portion which are arranged to face each other and stand up from the bottom, and the outer packaging body is configured to be deformed in a manner such that a protrusion protrudes from the front portion and the back portion of the outer packaging body toward the outside of the outer packaging body respectively, and the opening portion is formed at a position adjacent to the bottom, thereby forming the shape capable of standing on its own. The packaging container is capable of standing on its own by having the bottom of the outer packaging body deformed into the shape as the lower side and the protrusion grounded.

[0053] [6] According to any one of [1] to [4], an assembly portion assembled to close the bottom is provided at the bottom of the outer packaging body, and the outer packaging body is configured to deform in such a manner that the assembly portion is unfolded to form the opening at the bottom, thereby forming the shape that can be self-supporting.

[0054] [7] According to any one of [1] to [4], a packaging container is provided at the bottom of the outer packaging body with a folded portion folded inwardly of the outer packaging body, and the outer packaging body is configured to be deformed in such a manner that the folded portion is unfolded and the opening portion is formed at the bottom, thereby forming the shape that can stand on its own.

[0055] [8] According to any one of [1] to [4], an easy-to-open seal portion is provided at the bottom of the outer packaging body along the left-right direction, and the outer packaging body is configured so that the bottom is expanded in the front-to-back direction at the easy-to-open seal portion and deformed in a manner so as to form the opening portion at the bottom, thereby forming the shape capable of being self-supporting.

[0056] [9] According to any one of [1] to [4], the outer packaging body is deformed in a manner such that the bottom expands in the front-to-back direction, and in the middle of the deformation, it is deformed in a manner such that the opening portion opening downward is formed at the bottom and the assembly portion is assembled to close the bottom, and the outer packaging body is formed into the shape that can be self-supporting.

[0057]

[10] A packaged food comprising a food and the packaging container according to any one of [1] to [9], wherein the food is contained in the packaging bag.

[0058]

[11] The packaged food according to

[10] , wherein the food is instant noodles.

[0059]

[12] A method for cooking packaged food, wherein the packaged food is the packaged food described in

[10] or

[11] , and the method for cooking packaged food comprises a heating step and a self-standing step. In the heating step, the packaging bag is heated by a microwave oven in a lying state, and in the self-standing step, the bottom of the outer packaging body deformed into the shape is positioned as the lower side, so that the packaging container is self-standing.

[0060] (Effects of the Invention) The packaging container of the present invention comprises a packaging bag for a microwave oven and an outer packaging body. The outer packaging body is deformed in such a way that an opening portion opening downward is formed at the bottom or a position adjacent to the bottom during or after the deformation, thereby being deformed into a self-supporting shape. In such a structure, the outer packaging body can be easily deformed and made self-supporting, and the heated packaging bag can be supported by the deformed outer packaging body so that it can be stably self-supporting and used as tableware. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] (First point of view) Figure 1A This is a perspective view showing a state where contents are placed in the packaging bag 1 according to the first embodiment of the present invention. Figure 1B It is a perspective view of the packaging bag 1 in an opened state.

[0062] Figure 2 The figure shows the packaging bag 1 from a front view.

[0063] Figure 3 It is a cross-sectional view of a film constituting the packaging bag 1.

[0064] Figure 4A for Figure 2 Magnified view of area A. Figure 4B for Figure 4A Cross-sectional view of the film at line BB.

[0065] Figure 5 It is a perspective view of the bottom film 20 a constituting the bottom surface portion 2 .

[0066] Fig. 6A It is a side view of the peripheral wall membrane 40. Figure 6B The state in which a part of the peripheral wall film 40 is cut is shown.

[0067] Fig. 7A The state where the V-shaped base film 42 is inserted between the front film 43 and the back film 44 is shown. Figure 7B The state after the base film 42, the front film 43, and the back film 44 are welded to each other is shown.

[0068] Figure 8 This is a diagram showing a packaging bag 1 according to a second embodiment of the present invention in a front view.

[0069] Fig. 9 This is a perspective view of a packaging bag 1 according to the second embodiment, in a state where contents are placed therein.

[0070] Figure 10A to Figure 10C It is an explanatory diagram showing a state where the opening 22 of the packaging bag 1 according to the second embodiment is opened and closed by the opening and closing member 23 . Fig. 10A for Figure 8 BB section view in Fig. 10B for Fig. 10A A magnified view of region F in Fig. 10C Show that Fig. 10B The opening and closing member 23 is in an open state.

[0071] (Second and fourth viewpoints) Fig.11A as well as Fig. 11B It is a perspective view of the packaging container 100 according to the first embodiment of the present invention. Fig.11A The state before the outer packaging body 5 is opened is shown. Fig. 11B The state in which the outer package body 5 has been opened is shown.

[0072] Fig. 12A This is a perspective view showing a state where the packaging bag 1 contains the contents. Fig. 12B It is a perspective view of the packaging bag 1 in an opened state.

[0073] Fig.13 To show from the main perspective Fig. 12A Figure 1 of the packaging bag.

[0074] Fig.14A for Fig.13 AA section view in the figure, Fig. 14B for Fig.14A A magnified view of area B in Fig. 14C Shows that Fig. 14B The opening and closing member 23 is in an open state.

[0075] Fig.15 It is a perspective view of the bottom film 20 a constituting the bottom surface portion 2 of the packaging bag 1 .

[0076] Fig.16 This is an enlarged view of the bottom surface portion 2 in a state where the lower end of the central portion of the packaging bag 1 is widely opened in the front-rear direction.

[0077] Fig.17A It is a front view of the outer packaging body 5. Fig. 17B It is a bottom view of the outer packaging body 5. Fig. 17B In FIG. 1 , the solid line shows the outline of the bottom 51 of the outer packaging body 5 before deformation, and the two-dot chain line shows the outline of the bottom 51 of the outer packaging body 5 after deformation.

[0078] Fig.18 It is a perspective view of the packaging container 100 which stands on its own with the bottom 51 of the deformed outer packaging body 5 facing downward.

[0079] Fig.19A It is a perspective view of the outer packaging body 5 of the packaging container 100 according to the second embodiment of the present invention. Fig.19B It is a perspective view of the packaging container 100 in a state where the outer packaging body 5 has been opened.

[0080] Fig. 20A as well as Fig. 20B It is a perspective view of a packaging container 100 according to a third embodiment of the present invention. Fig. 20A The outer packaging body 5 is shown to be opened. Fig. 20B The outer packaging body 5 is shown Fig. 20A The state of a deformed state.

[0081] Fig.21A as well as Fig. 21B It is a bottom view of the outer packaging body 5 of the packaging container 100 according to the third embodiment. Fig.21A is a bottom view of the outer packaging body 5 before deformation, Fig. 21B It is a bottom view of the outer packaging body 5 after deformation.

[0082] Fig.22A It is a perspective view of a packaging container 100 according to Modification 1 of the third embodiment. Fig. 22B This is a perspective view showing a state in which the outer packaging body 5 of Modification 1 has been opened, and the packaging bag 1 is omitted from the illustration.

[0083] Fig.23 To observe from the right side of the outer packaging body 5 Fig. 22B FIG. 5 is a diagram showing a state in which the outer packaging body 5 is lying down and arranged on the ground contact surface G.

[0084] Fig.24A This is a diagram showing a lying state of the packaging container 100 in which the outer packaging body 5 is deformed in the first modification of the third embodiment. Fig. 24B In order to make the bottom 51 the lower side and Fig.24A A perspective view of a packaging container 100 in a self-standing state.

[0085] Fig.25A It is a perspective view of a packaging container 100 according to a second modification of the third embodiment. Fig.25B This is a perspective view showing a state in which the outer packaging body 5 of Modification 2 has been opened, and the packaging bag 1 is omitted from the illustration.

[0086] Fig.26A This is a diagram showing a lying state of the packaging container 100 in which the outer packaging body 5 is deformed in the second modification of the third embodiment. Fig.26B In order to make the bottom 51 the lower side and Fig.26A A perspective view of a packaging container 100 in a self-standing state.

[0087] Fig.27A It is a front view of a packaging container 100 according to a fourth embodiment of the present invention. Fig.27B It is a plan view of a state in which the bottom member 91 constituting the folded portion 9 of the outer packaging body 5 is unfolded. Fig.27C It is a perspective view of a state where the bottom member 91 is bent.

[0088] Fig.28A This is a perspective view of a packaging container 100 according to a fourth embodiment, and is a view showing a state in which the outer packaging body 5 is deformed. Fig.28B It is a bottom view of the deformed outer packaging body 5.

[0089] Fig.29 It is a top view of a packaging container 100 according to a modified example of the fourth embodiment.

[0090] Fig. 30A as well as Fig. 30B It is a perspective view of a packaging container 100 according to a fifth embodiment of the present invention. Fig. 30A The outer packaging body 5 is shown to be opened. Fig. 30B The outer packaging body 5 is shown Fig. 30A The state of a deformed state.

[0091] Fig.31A as well as Fig.31B It is a bottom view of the outer packaging body 5 of the packaging container 100 according to the fifth embodiment. Fig.31A is a bottom view of the outer packaging body 5 before deformation, Fig.31B It is a bottom view of the outer packaging body 5 after deformation.

[0092] Fig.32A The state in which the outer packaging body 5 of the packaging container 100 according to the sixth embodiment of the present invention is attached is shown. Fig.32B It is a bottom view of the outer packaging body 5 before deformation.

[0093] Fig.33A as well as Fig.33B It is a bottom view of the outer packaging body 5 of the sixth embodiment. Fig.33A is a bottom view of the outer packaging body 5 in the process of deformation, Fig.33B It is a bottom view of the outer packaging body 5 after deformation.

[0094] Fig.34 It is a perspective view of the packaging container 100 according to the sixth embodiment, and is a view showing a state in which the outer packaging body 5 is deformed.

[0095] (Third point of view) Fig.35A as well as Fig.35B It is a perspective view of the packaging container 100 according to the first embodiment of the present invention. Fig.35A The state before the packaging box 5a is opened is shown. Fig.35B The packaging box 5a is shown in a state where it has been opened.

[0096] Fig.36A This is a perspective view showing a state where the packaging bag 1 has been opened at the upper opening portion 26 and the contents are placed therein. Fig.36B It is a perspective view of the packaging bag 1 in a state where the opening portion 24 is opened.

[0097] Fig.37 The figure shows the packaging bag 1 from a front view.

[0098] Fig.38A It is a side view of the peripheral wall membrane 20b. Fig.38B This figure shows a state where a part of the peripheral wall film 20b is cut and the bottom film 20a is inserted into the cut portion.

[0099] Fig.39A This is a diagram showing a state in which the peripheral wall film 20b and the bottom film 20a are welded to produce the packaging bag 1. Fig.39B This is a diagram showing a state where the opening and closing member 23 is inserted between the front portion 3 and the back portion 4 .

[0100] Fig.40A It is a perspective view of the packaging box 5a of the packaging container 100 according to the second embodiment of the present invention. Fig.40B It is a perspective view of the packaging container 100 in a state where the packaging box 5a has been opened. DETAILED DESCRIPTION

[0101] Hereinafter, the embodiments of the present invention will be described with reference to the accompanying drawings. The various characteristic items shown in the embodiments shown below can be combined with each other. In addition, each characteristic item can constitute an invention independently. In addition, items recorded from different viewpoints can be combined with each other as long as they do not violate their main purpose.

[0102] (First point of view) 1. First Implementation 1-1. Packaging bag 1 like Figure 1A As shown, a packaging bag 1 according to a first embodiment of the present invention is a packaging bag for a microwave oven in which a flexible film is formed into a bag shape. The packaging bag 1 has a peripheral surface 21 constituting the peripheral surface of the bag shape. In addition, the packaging bag 1 has a bottom surface 2, and the peripheral surface 21 is provided to stand up from the bottom surface 2. The peripheral surface 21 has a front surface 3 and a back surface 4 facing each other.

[0103] Figure 2 1 is a diagram showing the packaging bag 1 in a front view. The front view refers to a state in which the packaging bag 1 is flattened without any content in the packaging bag 1 and the packaging bag 1 is observed from a direction perpendicular to the front portion 3 of the packaging bag 1. Figure 2 As shown in FIG. 1 , the packaging bag 1 is formed to be symmetrical with respect to the center line in the left-right direction as a reference line. Figure 2 The top, bottom, left, and right of the packaging bag 1 are described as the top, bottom, left, and right of the packaging bag 1. Specifically, the bottom surface 2 side is the bottom side, and the front surface 3 (and the back surface 4) side relative to the bottom surface 2 is the top side. In addition, the left and right when the front surface 3 is arranged close to the reader side are the left and right of the packaging bag 1. Furthermore, the front surface 3 side is the front side, and the back surface 4 side is the back side.

[0104] The front portion 3 and the back portion 4 are fused (heat-sealed) to each other at their left and right ends (hereinafter also referred to as side ends). The bottom portion 2 is fused to the front portion 3 and the back portion 4. In this way, the bottom portion 2, the front portion 3, and the back portion 4 are fused to each other, and the film is formed into a bag shape. In addition, the packaging bag 1 can stand on its own with the bottom portion 2 as the lower side.

[0105] like Figure 1A As shown in FIG. 1 , when the contents are contained inside, the upper end welded portion 19 is provided at the upper end of the packaging bag 1, and the packaging bag 1 is sealed. The packaging bag 1 has an upper tear-off portion 105 and a lower main body portion 6 in the vertical direction, with the unsealed portion 24 as a boundary. By tearing the peripheral surface portion 21 in the circumferential direction at the unsealed portion 24 and separating the tear-off portion 105, as shown in FIG. Figure 1B As shown, an opening 107 is formed. The main body 6 can also be used as a cutlery when eating the contents in the packaging bag 1.

[0106] like Figure 3 As shown, the film constituting the peripheral surface portion 21 is a laminated film in which a first substrate layer 181, a second substrate layer 184, and a sealant layer 186 are laminated in this order via adhesive layers 183 and 185. A printed layer 182 may be further provided between the first substrate layer 181 and the second substrate layer 184.

[0107] The first substrate layer 181 is configured to be exposed on the outer surface of the packaging bag 1. The first substrate layer 181 is formed of a material having excellent strength and high impact resistance. As the material, for example, polyamide, polyolefin, polyethylene, polyester, etc. are used. More specifically, a stretched polyethylene terephthalate film, a resin-deposited stretched polyethylene terephthalate film formed by depositing a resin having barrier properties, a silica-deposited stretched polyethylene terephthalate film, an alumina-deposited stretched polyethylene terephthalate film, a stretched nylon film, a stretched polypropylene film, or a polypropylene / ethylene-vinyl alcohol copolymer co-extruded co-stretched film can be used. In addition, as a film constituting the first substrate layer 181, it is preferred that it has a straight-line cutting property in the MD direction (the direction in which the film flows during manufacturing). Moreover, from the above viewpoint, the first substrate layer 181 is preferably composed of a stretched polyethylene terephthalate film, and further, from the viewpoint of improving barrier properties, it is preferably composed of a resin deposited stretched polyethylene terephthalate film, a silica deposited stretched polyethylene terephthalate film or an alumina deposited stretched polyethylene terephthalate film.

[0108] The thickness of the first substrate layer 181 is, for example, 6 to 18 μm, preferably 10 to 14 μm. Specifically, the thickness of the first substrate layer 181 is, for example, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18 μm, or may be within a range between any two of the values ​​exemplified herein.

[0109] The second substrate layer 184 is disposed between the first substrate layer 181 and the sealing layer 186. The second substrate layer 184 is formed of a material having excellent strength and barrier properties. As a material, the same material as the first substrate layer 181 can be used. In addition, as a film constituting the second substrate layer 184, it is preferred to have a straight-line cutting property in the MD direction. From the above viewpoint and the aspect of being relatively cheap, it is preferred that the second substrate layer 184 is composed of a stretched nylon film.

[0110] The thickness of the second substrate layer 184 is, for example, 12 to 23 μm, preferably 15 to 20 μm. Specifically, the thickness of the second substrate layer 184 is, for example, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, or 23 μm, or may be within a range between any two of the values ​​exemplified herein.

[0111] The adhesive layers 183 and 185 are layers for adhering the first substrate layer 181 and the second substrate layer 184, and the second substrate layer 184 and the sealing layer 186 in a mutually laminated manner. As the bonding method, for example, extrusion lamination using polyethylene or the like as the adhesive layers 183 and 185 may be used, or dry lamination using polyvinyl acetate adhesives, polyacrylate adhesives, cyanoacrylate adhesives, ethylene copolymer adhesives, cellulose adhesives, polyester adhesives, polyamide adhesives, amino resin adhesives, epoxy adhesives, polyurethane adhesives, etc. as adhesive materials may be used.

[0112] The sealing layer 186 is configured to be exposed on the inner surface of the packaging bag 1. The sealing layers 186 are welded (heat-sealed) to each other to form a welded portion. The sealing layer 186 can be formed of a resin with excellent weldability. As the sealing layer 186, for example, it can be formed of a polyolefin resin such as polyethylene, polypropylene, ethylene-vinyl acetate copolymer, ethylene-propylene block copolymer, etc., and more specifically, unstretched polypropylene and linear low-density polyethylene can be used. As a film constituting the sealing layer 186, it is preferred to have a straight-line cutting property in the MD direction. In addition, in the case of a packaging bag for soft cans, it is preferred to use a material with excellent boiling resistance (the stability of physical properties when placed in a high-temperature and high-pressure environment for a long time during the sterilization process when manufacturing soft cans). From the above viewpoint, as the sealing layer 186, it is preferred to use an unstretched polypropylene film with boiling resistance.

[0113] In order to improve the sliding property of the contents attached to the inner surface of the packaging bag 1, the sealing layer 186, which is the innermost surface of the packaging bag 1, can be subjected to an easy-slip treatment. The easy-slip treatment can be performed by mixing a slip agent in the sealing layer 186 or applying a slip agent on the sealing layer 186, or by performing a waterproof and oil-proofing process on the innermost surface of the packaging bag 1. The easy-slip treatment is preferably performed on the vicinity of the opening portion 24 and the tearing portion 105. If the packaging bag 1 is heated while lying down, the contents may move to the opening portion 24 or the tearing portion 105, and the hands or scissors may be soiled when the packaging bag 1 is opened. However, by performing an easy-slip treatment on the vicinity of the opening portion 24 and the tearing portion 105, the packaging bag 1 is made to stand up after heating, and the contents fall to the lower side, thereby avoiding the above-mentioned situation. The easy-slip treatment can be performed during film manufacturing or during bag making.

[0114] The thickness of the sealing layer 186 is, for example, 46-64 μm, preferably 50-60 μm. Specifically, the thickness of the sealing layer 186 is, for example, 46, 48, 50, 52, 54, 56, 58, 60, 62, 64 μm, or may be within a range between any two of the values ​​exemplified herein.

[0115] As an example, in this embodiment, the structure is formed by stacking the first base layer 181: stretched polyethylene terephthalate (12 μm) / printed layer 182 / first adhesive layer 183 (dry lamination) / second base layer 184: stretched nylon (15 μm) / second adhesive layer 185 (dry lamination) / sealing layer 186: unstretched polypropylene (60 μm) in this order.

[0116] The film constituting the bottom surface portion 2 may be made of a material having the same structure and physical properties as those of the film constituting the peripheral surface portion 21 , or may be made of a material having different physical properties.

[0117] like Figure 1A As shown, the front part 3 is provided with a folding part 10. The folding part 10 is formed so that the inner surfaces of the films constituting the upper part and the lower part of the front part 3 overlap and are welded.

[0118] like Figure 1A to Figure 2 As shown, an opening portion 24 is provided on the peripheral surface portion 21. The opening portion 24 is a portion for opening the packaging bag 1 by tearing the peripheral surface portion 21. In the present embodiment, the opening portion 24 is provided on both the front portion 3 and the back portion 4 of the peripheral surface portion 21 at a position closer to the bottom portion 2 than the palm-jointing portion 10 so as to extend across the packaging bag 1 in the left-right direction.

[0119] In the present embodiment, the unsealing portion 24 has a tearing start portion 24a as a starting point for tearing the peripheral surface portion 21 and an easy-tear processed portion 24d. The tearing start portion 24a is a portion that makes it easier to tear the peripheral surface portion 21, and is composed of, for example, a notch or a cut. The tearing start portion 24a can be provided at one end of the unsealing portion 24, or at both ends. In addition, the tearing start portion 24a can be omitted.

[0120] In the easy tearing processed portion 24d of the unseal portion 24, the easy tearing processing is performed on the entire second base material layer 184 and a part of the sealant layer 186. In the present embodiment, perforation processing is performed as the easy tearing processing in the easy tearing processed portion 24d.

[0121] The holes along Figure 2 The perforations are formed in the tearing direction D of the peripheral portion 21 shown, that is, formed along the extending direction of the unsealed portion 24. The shape of the perforations is not particularly limited, for example, in the main viewing angle, it may be a dotted line parallel to the tearing direction D, or a shape in which a plurality of straight lines inclined relative to the tearing direction D are arranged along the tearing direction D, or a curved shape extending as a whole along the tearing direction D. In addition, a plurality of rows of perforations may be formed along the tearing direction D of the peripheral portion 21.

[0122] Figure 4A for Figure 2An enlarged view of the area A. In the present embodiment, the perforations 24c are configured such that, in the front view angle, a plurality of cuts inclined relative to the tearing direction D are arranged along the tearing direction D of the peripheral surface portion 21. Specifically, the cuts formed by a pair of linear inclined lines 24c1, 24c2 are arranged in a plurality of rows (three rows as an example) along the tearing direction D. The pair of inclined lines 24c1, 24c2 form an inclination angle θ1, θ2 with the tearing direction D. Among them, the inclination angles θ1, θ2 in the present disclosure refer to the smaller angles among the angles formed between the inclined lines 24c1, 24c2 constituting the cuts and the tearing direction D. In addition, in the case where the tear starting portion 24a is formed by a notch or a notch, the front end of the notch or the notch (the end located on the center line side of the packaging bag 1 in the left-right direction) is configured to be at approximately the same height as the cuts in the central row in the up-down direction.

[0123] Figure 4B for Figure 4A BB line of the film. The hole 24c is formed when the second base layer 184 and a part of the sealing layer 186 are cut into the whole of the film in the thickness direction of the film at the easy tearing processed portion 24d. Specifically, regarding the hole 24c, the second base layer 184 is cut into the whole of the film in the thickness direction from the surface of the second base layer 184 located on the outside (the first base layer 181 side) in the thickness direction of the film, and the submerged portion 184a, which is a part of the second base layer 184, enters the sealing layer 186 in the thickness direction of the film in the cut portion. The thickness of the second base layer 184 at the submerged portion 184a is smaller than the thickness t1 of the second base layer 184 at the portion other than the submerged portion 184a (the portion where the hole 24c is not formed). In addition, the hole 24c is cut into the whole of the second adhesive layer 185 in the thickness direction of the film, and the submerged portion 185a, which is a part of the second adhesive layer 185, enters the sealing layer 186 in the thickness direction of the film in the cut portion. The hole 24c is cut from the surface of the sealing layer 186 located on the outside (the second base layer 184 side) to the middle of the thickness direction. In addition, the hole 24c enters the sealing layer 186 through the submerged portion 184a of the second base layer 184 and the submerged portion 185a of the second adhesive layer 185, thereby forming a cavity 187 between the first base layer 181 and the second base layer 184.

[0124] The eyelet 24c may be Figure 4B The second base material layer 184 is formed in a manner that is not completely cut (in a manner that is continuous without being cut at the portion where the immersed portion 184a is sunk the deepest) as in the eyelet 24c shown in the figure on the right side of the middle, and from the viewpoint of making the easy-tear processed portion 24d easier to tear, it is preferably formed in a manner that is not completely cut (in a manner that is continuous without being cut at the portion where the immersed portion 184a is sunken the deepest). Figure 4BThe hole 24c is formed in such a way that the second base material layer 184 is completely cut (in such a way that it is cut at the part where the immersed part 184a is sunk the deepest, not in a continuous manner) as shown in the hole 24c shown in the figure in the center of the left-right direction. The number of holes 24c in which the second base material layer 184 is completely cut is preferably 5% or more, and more preferably 30% or more relative to the total number of holes 24c. Similarly, the hole 24c can be formed in such a way that the second adhesive layer 185 is not completely cut, but from the viewpoint of making the easy-tear processed part 24d easier to tear, it is preferably formed in such a way that the second adhesive layer 185 is completely cut. The number of holes 24c in which the second adhesive layer 185 is completely cut is preferably 5% or more, and more preferably 30% or more relative to the total number of holes 24c.

[0125] In addition, the layers outside the second substrate layer 184 (in this embodiment, the first adhesive layer 183, the printed layer 182, and the first substrate layer 181) are not perforated. In this way, by forming the perforations 24c as easy-tear processing on the entire second substrate layer 184 and a part of the sealing layer 186, the easy-tear processing portion 24d of the unsealing portion 24 can be torn straight even after being heated in a microwave oven. In addition, the perforations 24c do not penetrate the sealing layer 186 or are not formed in the first substrate layer 181, so that the strength and barrier properties of the packaging bag 1 can be fully ensured.

[0126] The hole 24c is preferably formed so as to cut into 5% to 80% of the thickness of the sealing layer 186 from one surface of the sealing layer 186 in the thickness direction of the film, and more preferably so as to cut into 30% to 60% of the thickness of the sealing layer 186. Figure 4B As shown, if the cut depth (length in the thickness direction) of the perforation 24c in the sealing layer 186 is set to t2, then t2 / t1 is, for example, 0.1 to 4, preferably 0.5 to 2, specifically, for example, 0.1, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, or may be in the range between any two of the values ​​exemplified here. If the cut formed in the sealing layer 186 is too shallow, it may become difficult to tear the easy-tear processed portion 24d after heating in a microwave oven. On the other hand, if the cut is too deep, the strength and barrier properties of the packaging bag 1 may be insufficient. If the perforation 24c has the above-mentioned structure, it is possible to avoid the packaging bag 1 being damaged at the formation portion of the perforation 24c due to the excessively deep cut during the period when the steam generated in the packaging bag 1 is discharged from the steam release seal portion 11 during heating.

[0127] In addition, if the width of the cavity 187 in the tearing direction D is set to t3, then from the viewpoint of making the easy-tear processed portion 24d easier to tear, it is preferably t1<t3. The value of t3 / t1 is, for example, 1<t3 / t1≤4, preferably 1.5≤t3 / t1≤3, specifically, for example, 1.1, 1.5, 2, 2.5, 3, 3.5, 4, and may also be within the range between any two of the values ​​exemplified here.

[0128] In the packaging bag 1 of the present embodiment, since perforation processing is not performed on the layer outside the second base layer 184, it is difficult to perform perforation processing as described above on the second base layer 184 and the sealing layer 186 after processing the film into a bag shape in the manufacture of the packaging bag 1. Therefore, in the manufacture of the packaging bag 1, as described later, after forming perforations 24c at positions corresponding to the easy-tear processed portions 24d of the peripheral wall film 40 constituting the front portion 3 side and the back portion 4 side, the packaging bag 1 is formed into a bag shape. At this time, in order to facilitate the easy-tear processed portion 24d of the unsealing portion 24 to tear the front portion 3 and the back portion 4 together straightly to separate the tear portion 105, it is necessary to mold the peripheral wall film 40 so that the regions where the perforations 24c are formed on the front portion 3 side and the back portion 4 side overlap each other in the front-back direction of the packaging bag 1. The perforations 24c are formed in such a manner that a plurality of cuts inclined relative to the tearing direction D are arranged along the tearing direction D, thereby making it possible to increase the overlap range of the areas where the perforations 24c are formed on the front portion 3 side and the back portion 4 side in the front-to-back direction. Thus, even if the perforations 24c on the front portion 3 side and the perforations 24c on the back portion 4 side do not completely overlap in the front-to-back direction, since the areas where the perforations 24c are formed overlap in the front-to-back direction, it is easy to tear the front portion 3 and the back portion 4 of the packaging bag 1 straight together at the easy-tear processed portion 24d of the unsealing portion 24. In addition, as Figure 4A As shown, by forming the perforations 24c by a pair of straight inclined lines 24c1 and 24c2 having different inclination directions with respect to the tearing direction D, or by forming the perforations 24c in a plurality of rows, the overlapping range of the regions where the perforations 24c are formed on the front portion 3 side and the back portion 4 side can be made larger. In such a structure, the perforations 24c on the front portion 3 side and the back portion 4 side are allowed to be offset to a certain extent in the front-rear direction, so that the manufacturing of the packaging bag 1 becomes easy.

[0129] Among them, the inclination angles θ1 and θ2 formed between the inclined lines 24c1 and 24c2 and the tearing direction D are, for example, 5 to 45°, preferably 15 to 30°, specifically, for example, 5, 10, 15, 20, 25, 30, 35, 40, 45°, or can be within the range between any two of the values ​​​​exemplified herein. As an example, θ1=θ2=25°. If the inclination angles θ1 and θ2 are too small, the repetition range of the area where the perforations 24c are formed on the front side 3 and the back side 4 becomes smaller, and there is a situation where it becomes difficult to obtain the above-mentioned effect. In addition, if the inclination angles θ1 and θ2 are too large, there is a situation where it becomes difficult to tear the unsealing portion 24 straight.

[0130] In addition, if the height of each inclined line 24c1, 24c2 in the vertical direction (the length in the direction perpendicular to the tearing direction D) is d1, and the interval between the adjacent inclined lines 24c1, 24c2 in the tearing direction D is d2, then from the viewpoint of making the easy-tear processed portion 24d easier to tear, preferably d2<d1. The value of d1 / d2 is, for example, 1<d1 / d2≤1.4, preferably 1.1≤d1 / d2≤1.3, specifically, for example, 1.1, 1.2, 1.3, 1.4, and may also be within the range between any two of the numerical values ​​exemplified here.

[0131] In addition, if the width of each inclined line 24c1, 24c2 in the tearing direction D is set to d3, then from the viewpoint of making the easy-tear processed portion 24d easier to tear, preferably d2<d3. The value of d3 / d2 is, for example, 2≤d1 / d2≤3.5, preferably 2.5≤d1 / d2≤3, and specifically, for example, 2, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, 3, 3.1, 3.2, 3.3, 3.4, 3.5, and may be within the range between any two of the values ​​exemplified here.

[0132] like Figure 2 As shown in FIG. 1 , a steam release seal portion 11 is formed in the packaging bag 1. The steam release seal portion 11 is provided at the palm-jointed portion 10. The steam release seal portion 11 is a weld portion having a lower weld strength than other weld portions. When the steam generated inside the packaging bag 1 by heating causes the internal pressure inside the packaging bag 1 to rise, the steam release seal portion 11 forms a steam flow path accordingly. The steam in the packaging bag 1 is discharged to the outside from the steam release seal portion 11.

[0133] The length H1 of the tear-off portion 105 in the vertical direction can be, for example, 6 cm to 10 cm. The length H2 of the main body 6 in the vertical direction can be, for example, 6 cm to 14 cm. From the perspective of easy removal of the contents, the length H2 is preferably less than 12 cm, and more preferably less than 10 cm. Specifically, H1 is, for example, 6, 7, 8, 9, 10 cm, or it can be in the range between any two of the numerical values ​​shown here as an example. Specifically, H2 is, for example, 6, 7, 8, 9, 10, 11, 12, 13, 14 cm, or it can be in the range between any two of the numerical values ​​shown here as an example. Moreover, from the perspective of ensuring the volume for accommodating the contents, the length H2 is preferably longer than the length H3 from the center line E of the bottom film 20a to the lower end. The value of H2-H3 is, for example, 2 to 8 cm, specifically, for example, 2, 3, 4, 5, 6, 7, 8 cm, or it can be in the range between any two of the numerical values ​​shown here as an example.

[0134] The side end welded portion 12 for welding the front portion 3 and the back portion 4 is provided at the side end of the packaging bag 1. Thus, the front portion 3 and the back portion 4 are fixed in the front-back direction. Furthermore, the bottom end welded portion 13 for welding the bottom portion 2 and the front portion 3 and the bottom portion 2 and the back portion 4 is provided at the lower end of the packaging bag 1. The bottom end welded portion 13 is a welded portion provided at the lower end side of the center line E. Figure 2 The bottom portion 2 and the front portion 3 are welded together, as well as the bottom portion 2 and the back portion 4 are welded together.

[0135] like Figure 5 As shown in FIG. 1 , the bottom film 20a bent into a V-shape at the center line E is inserted between the front part 3 and the back part 4, thereby manufacturing the packaging bag 1. Notches R are formed at both ends of the bottom film 20a. The front part 3 and the back part 4 are directly welded at the notch R, as shown in FIG. Figure 2 As shown, a fixing portion 15 is formed to fix the front portion 3 and the back portion 4 in the front-rear direction.

[0136] like Figure 2 As shown, an air pocket 14 is provided outside the slope portion 13a of the lower end weld portion 13. The air pocket 14 is formed in a triangular shape and is a space where air that has not been completely exhausted to the outside remains due to the welding at the lower end weld portion 13. By providing the air pocket 14, the residual air in the lower end weld portion 13 is gathered in the air pocket 14, thereby improving the strength of the welding.

[0137] From the viewpoint of forming a size that can be placed on a turntable of a microwave oven, the length L1 of the lower end of the packaging bag 1 in the left-right direction is preferably 15 to 25 cm, and more preferably 18 cm or more. More specifically, for example, it is 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25 cm, and may be in the range between any two of the values ​​​​given as examples, for example, it can be 20 cm. In addition, the length L2 of the inner side of the packaging bag 1 in the left-right direction is preferably 10 to 23 cm, and more specifically, for example, it is 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23 cm, and may be in the range between any two of the values ​​​​given as examples, for example, it can be 18 cm.

[0138] 1-2. Method for manufacturing packaging bag 1 Below, refer to Figure 6A to Figure 7B , an overview of a method for manufacturing the packaging bag 1 will be described.

[0139] The packaging bag 1 is manufactured using a peripheral wall film 40. The peripheral wall film 40 is a laminated film in which the first substrate layer 181, the second substrate layer 184, and the sealing layer 186 are laminated in this order via the adhesive layers 183 and 185 as described above. When manufacturing the peripheral wall film 40, first, a film in which the second substrate layer 184 and the sealing layer 186 are laminated via the second adhesive layer 185 is manufactured, in which the entire second substrate layer 184 and a part of the sealing layer 186 at a portion corresponding to the easy-tear processed portion 24d of the opening portion 24 are subjected to easy-tear processing. In this embodiment, the perforations 24c are formed in the portions corresponding to the easy-tear processed portion 24d on the front portion 3 side and the back portion 4 side of the film in such a manner that the entire second substrate layer 184 and a part of the sealing layer 186 are cut in the thickness direction from the second substrate layer 184 side. After the perforations 24c are formed, the first substrate layer 181 is laminated again via the first adhesive layer 183 and the printing layer 182. In this way, the peripheral wall film 40 is obtained.

[0140] Then, if Fig. 6A As shown in FIG. 1 , the inner surfaces of the ends of a peripheral wall film 40 are overlapped to form an overlapped portion 10a. At this time, the peripheral wall film 40 is formed so that the perforations 24c on the front portion 3 side and the perforations 24c on the back portion 4 side overlap in the front-to-back direction of the packaging bag 1. Then, as shown in FIG. Figure 6B As shown in FIG. 1 , the overlapping portion 10a is welded to form the palm portion 10, and the remaining portion forms an elliptical ring C. Thus, the front film 43 and the back film 44 facing each other are obtained. Fig. 6A The long film extending continuously in the direction perpendicular to the paper surface (transportation direction) is supplied from the film roll. The front film 43 and the back film 44 are Figure 6BA long strip of film extending continuously in the direction perpendicular to the paper surface (conveying direction).

[0141] In addition, the front film 43 and the back film 44 may be supplied from other film rolls instead of processing the peripheral wall film 40 to obtain the front film 43 and the back film 44. In this case, the front film 43 is formed with the holes 24c of the easy-tear processed portion 24d on the front part 3 side, and the back film 44 is formed with the holes 24c of the easy-tear processed portion 24d on the back part 4 side, and the front film 43 and the back film 44 are overlapped in a manner that the holes 24c on the front part 3 side and the back part 4 side overlap each other in the front-back direction of the packaging bag 1.

[0142] Next, cut off the lower end C1 of the ring C, as shown in FIG. Fig. 7A As shown, the bottom film 42 is inserted between the front film 43 and the back film 44 from the lower end C1 side. Fig. 7A A long film extending continuously in the direction perpendicular to the paper surface (transportation direction). Figure 7B As shown, the bottom film 42 is welded to the front film 43 and the back film 44 respectively.

[0143] Next, with Figure 2 The front film 43 and the back film 44 are welded to each other at the same interval of the length L1 to form a transverse seal portion (not shown) extending in a direction perpendicular to the conveying direction. Next, the front film 43 and the back film 44 are separated at the upper end C2, leaving the upper end open. Furthermore, the front film 43, the back film 44 and the bottom film 42 are divided along the transverse seal portion. In this way, Figure 2 The packaging bag 1 is shown.

[0144] 2. Second Implementation use Figures 8 to 10C Hereinafter, a packaging bag 1 according to a second embodiment of the present invention will be described, focusing on the differences from the first embodiment.

[0145] In this embodiment, if Figure 8 as well as Fig. 9 As shown, an upper opening portion 125 and an opening and closing member 23 are provided on the peripheral surface portion 21 of the packaging bag 1. The upper opening portion 125 is a portion for opening the upper end of the packaging bag 1 by tearing the peripheral surface portion 21. The upper opening portion 125 is provided on both the front portion 3 and the back portion 4 of the peripheral surface portion 21 in a manner extending across the packaging bag 1 in the left-right direction at a position lower than the upper end welding portion 19 and higher than the palm-jointed portion 10. In addition, the upper opening portion 125 is located above the opening portion 24 (an example of a “lower opening portion”). At the upper opening portion 125, the peripheral surface portion 21 is torn in the left-right direction to separate the portion on the upper end side of the peripheral surface portion 21 including the upper end welding portion 19, thereby, as shown in FIG. Fig. 9 As shown, an opening portion 22 opening upward is formed.

[0146] The upper opening portion 125 has a tearing start portion 125a as a starting point for tearing the peripheral surface portion 21 and an easy-tear processing portion 125b. The tearing start portion 125a is a portion that makes it easier to tear the peripheral surface portion 21, and is composed of, for example, a notch or a cut. The tearing start portion 125a can be provided at one end of the upper opening portion 125, or at both ends. In addition, the tearing start portion 125a can be omitted.

[0147] In the easy tearing processed portion 125b, the whole of the second base material layer 184 of the film constituting the peripheral surface portion 21 and a part of the sealing layer 186 are subjected to easy tearing processing. In this embodiment, the easy tearing processed portion 125b is subjected to perforation processing as the easy tearing processing. In addition, the specific structure of the perforation processing in the easy tearing processed portion 125b is the same as the perforation processing in the easy tearing processed portion 24d of the unsealing portion 24 of the first embodiment, and the description thereof is omitted.

[0148] According to this structure, the peripheral surface portion 21 can be torn straightly at the easy-tear processed portion 125 b of the upper opening portion 125 .

[0149] The opening and closing member 23 is configured to open and close the opening 22 formed by the packaging bag 1 being opened at the upper opening portion 125. The opening and closing member 23 is located between the upper opening portion 125 and the opening portion 24 in the vertical direction and is located closer to the upper end of the packaging bag 1 than the closing portion 10. Figure 10A to Figure 10C This is an explanatory diagram of the opening 22 of the packaging bag 1 being opened and closed by the opening and closing member 23. The upper ends of the front portion 3 and the back portion 4 in the figure coincide with the formation position of the easy-tear processed portion 125b. Fig. 10B The position J shown in the figure indicates the position of the lower end of the upper opening portion 125 in the vertical direction (in this embodiment, Figure 8 The opening and closing member 23 has a front side engaging member 23a and a back side engaging member 23b that can engage with each other. The base 23a1 of the front side engaging member 23a and the base 23b1 of the back side engaging member 23b are fixed by being welded to the inner surfaces of the front part 3 and the back part 4, respectively. Fig. 10B As shown, the opening 22 is closed by the engagement of the hook 23a2 of the front side engaging member 23a and the hook 23b2 of the back side engaging member 23b. Fig. 10C As shown, the opening 22 is opened by releasing the engagement.

[0150] In addition, the bases 23a1 and 23b1 may be welded to the front part 3 and the back part 4 on their entire surfaces, and preferably, the bases 23a1 and 23b1 are welded to the surfaces located above and below the hooks 23a2 and 23b2, respectively. Furthermore, the base 23b1 of the back side engaging member 23b is welded to the inner surface of the back part 4 on the surfaces located above and below the hook 23b2, and the front side engaging member 23a welded to the front part 3 provided with the palm-jointing part 10 is preferably welded to the inner surface of the front part 3 on the surface above the hook 23a2, and not welded to the front part 3 on the surface below the hook 23a2. In other words, it is more preferable to provide an unwelded portion that is not welded to the front part 3 in a manner extending from the lower end of the base 23a1 to the upper end of the hook 23a2. In this case, when the internal pressure of the heated packaging bag 1 increases and expands, force in the direction of opening the opening and closing member 23 becomes difficult to be applied to the opening and closing member 23 , thereby suppressing leakage of contents from the opening and closing member 23 or discharge of steam from the opening and closing member 23 .

[0151] In addition, if Fig. 10B As shown, the distance d4 between the upper end of the hook portion located on the upper side of the hook portions 23a2 and 23b2 (in this embodiment, the upper end of the hook portion 23b2 of the back side engaging member 23b) and the peripheral edge of the opening portion 22 (in other words, the easy tearing processed portion 125b of the upper side opening portion 125) in the vertical direction is preferably 5 mm or more, and can be, for example, 10 mm. In addition, the distance d5 between the upper end of the opening and closing member 23 (in other words, the upper end of the base 23a1 and 23b1) and the lower end of the upper side opening portion 125 (in this embodiment, the lower end of the tearing start portion 125a) in the vertical direction is preferably 1 mm or more, and can be, for example, 2 mm. By setting the distances H6 and H7 in the above manner, when the opening portion 22 is opened by the opening and closing member 23, it is possible to ensure that the finger grip margin for placing fingers on the upper end of the packaging bag 1 is sufficiently large.

[0152] The vertical length H1 of the tear-off portion 105 can be, for example, 6 to 14 cm, and is 10 cm in this embodiment. The vertical length H2 of the main body 6 is, for example, 4 to 20 cm, preferably 6 to 18 cm, and is 7 cm in this embodiment.

[0153] 3. Other Implementation Methods The embodiments have been described above, but the technical idea in the present disclosure can also be adopted in the following aspects.

[0154] The packaging bag 1 may not have the bottom portion 2 formed of the bottom film 20 a . In this case, the front portion 3 and the back portion 4 may be welded to each other at the bottom of the packaging bag 1 to form the bottom of the packaging bag 1 .

[0155] The packaging bag 1 may not have the steam-releasing seal portion 11. In this case, for example, the packaging bag 1 can be slightly opened at the opening portion 24 to release the steam generated during heating.

[0156] The steam release seal portion 11 may be provided at a portion other than the closing portion 10 .

[0157] The packaging bag 1 may not have the closure portion 10 .

[0158] ・The method for producing the packaging bag 1 is not limited to the method described in the above embodiment.

[0159] The above describes various embodiments of the present invention, which are shown as examples and are not intended to limit the scope of the invention. The new embodiment can be implemented in various other ways, and various omissions, substitutions, and changes can be made without exceeding the scope of the main purpose of the invention. The embodiment or its modification is included in the scope or main purpose of the invention, or is included in the invention described in the claims and its equivalent.

[0160] (Second and fourth viewpoints) 1. First Implementation 1-1. Structure of packaging container 100 like Fig.11A as well as Fig. 11B As shown, the packaging container 100 of the first embodiment of the present invention is a packaging container for a microwave oven, and comprises: a packaging bag 1 for a microwave oven, which is formed of a flexible film in a bag shape; and an outer packaging body 5, which is provided to cover at least a part of the outer surface of the packaging bag 1. The packaging container 100 is suitable for the case where food to be heated and cooked by a microwave oven is contained as the content, and is particularly suitable for the case where instant noodles are contained as the content. In addition, the packaging bag 1 used in the packaging container 100 of this viewpoint can be a packaging bag having a shape described in the third viewpoint described later.

[0161] <Packaging bag 1> like Fig. 12A As shown, the packaging bag 1 has a bottom portion 2 and a peripheral portion 21 that is arranged in a manner of standing up from the bottom portion 2. The peripheral portion 21 has a front portion 3 and a back portion 4 that face each other, and has an opening 22 that opens upward. The front portion 3 and the back portion 4 are welded to each other at their ends in the left and right directions (hereinafter also referred to as side ends). The bottom portion 2 is welded (heat-sealed) to the front portion 3 and the back portion 4. By welding the bottom portion 2, the front portion 3 and the back portion 4, the film becomes bag-shaped. The contents are accommodated inside the packaging bag 1. In addition, it can also be configured so that the upper ends of the front portion 3 and the back portion 4 are welded and sealed in the left and right directions, and the user tears and separates the upper ends in the left and right directions, thereby forming the opening 22.

[0162] The packaging bag 1 may or may not be self-supporting, but is preferably in a self-supporting shape from the viewpoint of ensuring stability when the contents are contained. Fig.15 The bottom portion 2 formed of the bottom film 20a shown is self-supporting as the lower side. According to such a structure, compared with a flat bag-shaped packaging bag that does not have a bottom portion 2 and is formed by welding the front portion 3 and the back portion 4 at the bottom, in addition to ensuring a large volume inside the packaging bag 1, when the packaging bag 1 is heated by a microwave oven, the packaging bag 1 expands greatly in the front-back direction at the bottom portion 2. Therefore, as described later, when the outer packaging body 5 is deformed into a self-supporting shape due to the expansion of the packaging bag 1, the outer packaging body 5 is easily deformed, especially in a manner that the bottom of the outer packaging body 5 expands in the front-back direction.

[0163] Fig.13 1 is a diagram showing the packaging bag 1 from a front view perspective. The front view perspective refers to a state in which the packaging bag 1 is flattened without any content in the packaging bag 1 and is observed from a direction perpendicular to the front portion 3 of the packaging bag 1. Fig.13 The top, bottom, left, and right of the packaging bag 1 are described as the top, bottom, left, and right of the packaging bag 1. Specifically, the bottom surface 2 side is the bottom side, and the direction in which the front surface 3 (and the back surface 4) rises from the bottom surface 2 is the top side. In addition, the left and right when the front surface 3 is arranged on the reader side are the left and right of the packaging bag 1. Furthermore, the front surface 3 side is the front side, and the back surface 4 side is the back side.

[0164] like Fig. 12A As shown, the front portion 3 includes a front lower portion 3a and a front upper portion 3b. The front lower portion 3a is welded to the bottom portion 2. The front lower portion 3a and the front upper portion 3b are welded at a joint portion 10 formed by overlapping their inner surfaces. By providing the joint portion 10, a large volume in the packaging bag 1 can be ensured, so that when the outer packaging body 5 is deformed into a self-supporting shape by the expansion of the packaging bag 1, the outer packaging body 5 is easily deformed.

[0165] The peripheral surface 21 of the packaging bag 1 is provided with an opening and closing member 23 and an opening portion 24. The opening and closing member 23 is configured to be able to open and close the opening 22. Figure 14A to Figure 14C As shown, the opening and closing member 23 has a front side engaging member 23a and a back side engaging member 23b that can engage with each other. The base 23a1 of the front side engaging member 23a and the base 23b1 of the back side engaging member 23b are fixed to the inner surfaces of the front part 3 and the back part 4 respectively by welding. Fig. 14B As shown, the opening 22 is closed by the engagement of the hook portion 23a2 of the front side engaging member 23a with the hook portion 23b2 of the back side engaging member 23b. Fig. 14CAs shown, the opening 22 is opened by releasing the engagement.

[0166] In addition, the entire surface of the base 23a1, 23b1 may be welded to the front part 3 and the back part 4, respectively, and preferably, the surfaces located above and below the hooks 23a2, 23b2 are welded. Moreover, the base 23b1 of the back side engaging member 23b is welded to the inner surface of the back part 4 at the surfaces located above and below the hook 23b2, and the front side engaging member 23a to which the front part 3 having the palm-jointing part 10 is welded is preferably welded to the inner surface of the front part 3 at the surface above the hook 23a2, and the surface below the hook 23a2 is not welded to the front part 3. In other words, it is more preferable to set the non-welded portion to the front part 3 to extend from the lower end of the base 23a1 to the upper end of the hook 23a2. In this case, when the internal pressure of the heated packaging bag 1 increases and expands, force in the direction of opening the opening and closing member 23 becomes difficult to be applied to the opening and closing member 23 , thereby suppressing leakage of contents from the opening and closing member 23 or discharge of steam from the opening and closing member 23 .

[0167] The opening portion 24 is a portion for opening the packaging bag 1. In the present embodiment, the opening portion 24 has a tearing start portion 24a as a starting point for tearing the peripheral portion 21 and a tearing line 24b printed with a line indicating the portion to be torn off the opening portion. The packaging bag 1 can be opened by tearing the peripheral portion 21 starting from the tearing start portion 24a, or by cutting the peripheral portion 21 along the tearing line 24b using a cutting tool such as scissors. The tearing start portion 24a is composed of, for example, a notch or a cut. In addition, in place of the tearing line 24b, a half-cut line extending in the circumferential direction of the peripheral portion 21 may be provided, or a strip film may be configured by welding in a manner extending in the circumferential direction of the peripheral portion 21, and the peripheral portion 21 may be cut along the strip film by pulling out the strip film from the end.

[0168] The packaging bag 1 has a tear-off portion 16 on the upper side and a main body portion 17 on the lower side in the vertical direction, with the unsealing portion 24 as the boundary. The peripheral surface portion 21 is torn open in the circumferential direction of the unsealing portion 24 and the tear-off portion 16 on the upper side than the unsealing portion 24 is removed, as shown in FIG. Fig. 12B As shown, the main body 17 having the opening 18 can be obtained. As described later, the main body 17 can be used as tableware when eating the content in the packaging bag 1.

[0169] like Fig. 12A As shown, the opening portion 24 is provided at a position closer to the bottom surface portion 2 than the opening and closing member 23. That is, the opening and closing member 23 is provided at the tearing portion 16. Therefore, if the tearing portion 16 is removed during unsealing, the opening and closing member 23 is also removed together. Therefore, the opening and closing member 23 does not hinder the eating of the contents.

[0170] The opening portion 24 is provided at a position closer to the bottom surface portion 2 than the closing portion 10. That is, the closing portion 10 is provided at the tearing portion 16. Therefore, if the tearing portion 16 is removed during unsealing, the closing portion 10 is also removed together. Therefore, the closing portion 10 does not hinder the user from eating the contents.

[0171] like Fig.13 As shown in FIG. 1 , a steam release seal portion 11 is formed in the packaging bag 1. The steam release seal portion 11 is provided at the palm-jointed portion 10. The steam release seal portion 11 is a weld portion having a lower weld strength than other weld portions. When the steam generated inside the packaging bag 1 by heating causes the internal pressure inside the packaging bag 1 to rise, the steam release seal portion 11 forms a steam flow path accordingly. The steam in the packaging bag 1 is discharged to the outside from the steam release seal portion 11.

[0172] The length H1 of the tear-off portion 16 in the vertical direction can be, for example, 6 to 10 cm. The length H2 of the main body 17 in the vertical direction is, for example, 6 to 14 cm, preferably less than 12 cm, and more preferably less than 10 cm. If the length H2 is too large, it becomes difficult to take out the contents. Moreover, the length H2 is preferably longer than the length H3 from the center line E1 to the lower end of the bottom film 20a, and more preferably more than 2 cm longer than H3. The value of H2-H3 is, for example, 2 to 8 cm, specifically, for example, 2, 3, 4, 5, 6, 7, 8 cm, and can also be in the range between any two of the numerical values ​​exemplified herein. When the value of H2-H3 is less than 2 cm, the height of the peripheral wall when the packaging bag 1 is opened becomes lower, thereby limiting the amount of the contents.

[0173] The side end welded portion 12 for welding the front portion 3 and the back portion 4 is provided at the side end of the packaging bag 1. Thus, the front portion 3 and the back portion 4 are fixed in the front-back direction. Furthermore, the bottom end welded portion 13 for welding the bottom portion 2 and the front portion 3 and the bottom portion 2 and the back portion 4 is provided at the lower end of the packaging bag 1. The bottom end welded portion 13 is an area below the center line E1, and is formed at the side end and the lower end ( Fig.13 The bottom portion 2 and the front portion 3 and the bottom portion 2 and the back portion 4 are welded together (in the area surrounded by the single-dot chain line).

[0174] like Fig.15 As shown, the bottom film 20a bent into a V shape at the center line E1 is inserted between the front part 3 and the back part 4, thereby manufacturing the packaging bag 1. Among them, the length H3 is preferably 3 to 6 cm, more specifically, for example, any one of 3, 3.5, 4, 4.5, 5, 5.5, 6 (unit: cm), and can also be within the range between any two of the values ​​​​shown here as examples, for example, it can be 4.5 cm. As mentioned above, the main body 17 is also used as tableware, so it is preferably of this size. Notches R are formed at both ends of the bottom film 20a.

[0175] The bottom film 20a and the film constituting the peripheral surface 21 are preferably laminated films having a base layer and a sealing layer, and more preferably have an adhesive layer and a printed layer between the base layer and the sealing layer. In addition, the bottom film 20a and the film constituting the peripheral surface 21 may use films having the same structure and physical properties, or may use films having different structures and physical properties.

[0176] The base material layer is disposed so as to be exposed on the outer surface of the packaging bag 1, and the sealant layer is disposed so as to be exposed on the inner surface of the packaging bag 1. The sealant layers are welded (heat-sealed) to each other to form a welded portion.

[0177] The substrate layer is formed by a material with excellent strength and high impact resistance. As the substrate layer, for example, polyamide, polyolefin, polyethylene, polyester, etc. are used. More specifically, stretched polyethylene terephthalate film, silica deposition stretched polyethylene terephthalate film, alumina deposition stretched polyethylene terephthalate film, stretched nylon film, stretched polypropylene film, polypropylene / ethylene-vinyl alcohol copolymer co-extruded co-stretched film, etc. can be used. As the film constituting the substrate layer, it is preferably straight-line cutting property in the MD direction (the direction in which the film flows during manufacture). Antibacterial and antiviral agents (silver ions, etc.) can also be mixed in the substrate layer as the outermost layer. In particular, by mixing the exudative antibacterial and antiviral agents into the substrate layer, when heated by a microwave oven and becoming a high temperature, the surface of the substrate layer is treated with antibacterial and antiviral agents, and it is excellent in hygiene when taken out from the microwave oven.

[0178] The adhesive layer is a layer for bonding the base layer and the sealant layer in a mutually laminated manner. As the bonding method, for example, it can be extrusion lamination using polyethylene or the like as the adhesive layer, or it can be dry lamination using polyvinyl acetate adhesives, polyacrylate adhesives, cyanoacrylate adhesives, ethylene copolymer adhesives, cellulose adhesives, polyester adhesives, polyamide adhesives, amino resin adhesives, epoxy adhesives, polyurethane adhesives, etc. as adhesive materials.

[0179] The sealing layer can be formed of a resin having excellent weldability. The sealing layer can be formed of, for example, polyolefin resins such as polyethylene, polypropylene, ethylene-vinyl acetate copolymer, and ethylene-propylene block copolymer, and more specifically, unstretched polypropylene and linear low-density polyethylene can be used. The film constituting the sealing layer preferably has linear cutting properties in the MD direction.

[0180] In addition, as the film constituting the peripheral surface portion 21, it is preferred to use a film in which a first substrate layer, a second substrate layer, and a sealant are laminated in this order via an adhesive layer, and the entire second substrate layer and a portion of the sealant layer are subjected to easy-tear processing at the opening portion 24. Thus, even after heating in a microwave oven, it becomes easy to tear the packaging bag 1 straightly at the opening portion 24.

[0181] The easy-tear processing is, for example, perforation processing. When the perforation processing is implemented, along the extension direction (left-right direction) of the unsealing portion 24, perforations are formed that cut into the entire second substrate layer and a portion of the sealing layer. In this case, it is preferred that in the thickness direction of the film, 5 to 80% of the thickness of the sealing layer is cut from the surface of the second substrate layer side at the sealing layer, and more preferably 30% to 60% is cut. The shape of the perforation can be a dotted line parallel to the extension direction of the unsealing portion 24, or a curved line extending along the extension direction, or a shape in which multiple straight lines inclined relative to the extension direction are arranged along the extension direction. In addition, multiple rows of perforations can be formed along the extension direction of the unsealing portion 24.

[0182] like Fig.16 As shown, the packaging bag 1 is configured such that the lower end of the central portion in the left-right direction (hereinafter referred to as the central portion lower end) is more open in the front-back direction than the lower end of the side portion in the left-right direction (hereinafter referred to as the side portion lower end). This is because the notch R (refer to Fig.15 ), the front portion 3 and the back portion 4 are directly welded to form a fixing portion 15 that fixes the front portion 3 and the back portion 4 in the front-back direction. In addition, the center line E1 of the bottom portion 2 is pulled toward the lower side of the packaging bag 1 by opening the lower end of the central portion in the front-back direction.

[0183] The length H4 in the left-right direction at the lower end of the packaging bag 1 is preferably 10 to 25 cm, more preferably 18 cm or more. More specifically, it is, for example, any one of 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, and 25 (unit: cm), and may also be within a range between any two of the values ​​exemplified here, for example, 20 cm.

[0184] In addition, the bottom film 20a preferably has a tensile modulus that decreases as the temperature rises. In this case, when the packaging bag 1 is heated, the film softens, and the lower end of the central portion of the packaging bag 1 is easily opened in the front-to-back direction. Among them, the tensile modulus of the film constituting the bottom portion 2 in the TD direction (corresponding to the front-to-back direction of the packaging bag 1) at 23.5°C and 100°C is set to M1 and M2, respectively. The tensile modulus can be obtained by performing a tensile test according to JIS K 7127. The test speed of the tensile test is 50 mm / min, and the dumbbell shape used in the test is a No. 5 shape.

[0185] M1 is preferably 600~1400MPa, more preferably 800~1200MPa. Specifically, M1 is, for example, 600, 700, 800, 900, 1000, 1100, 1200, 1300, 1400MPa, or it may be in the range between any two of the numerical values ​​exemplified herein. M2 is preferably 200~600MPa, more preferably 300~500MPa. Specifically, M2 is, for example, 200, 250, 300, 350, 400, 450, 500, 550, 600MPa, or it may be in the range between any two of the numerical values ​​exemplified herein. The value of M1 / M2 is, for example, 1.2~4, preferably 1.5~3. Specifically, the value is, for example, 1.2, 1.5, 2, 2.5, 3, 3.5, 4, or it may be in the range between any two of the numerical values ​​exemplified herein.

[0186] <Outer packaging body 5> like Fig.11A as well as Fig. 11B As shown, the outer packaging body 5 has a bottom 51 and a peripheral surface 52 arranged in a manner of standing up from the bottom 51. The peripheral surface 52 has a front portion 53 and a back portion 54 facing each other, and a side portion 55 connecting the front portion 53 and the back portion 54 in the front-to-back direction. The outer packaging body 5 of this embodiment is generally box-shaped, and the packaging bag 1 is accommodated inside.

[0187] Fig.17A is a front view of the outer packaging body 5. In the present disclosure, Fig.17A The top, bottom, left, and right directions are described as the top, bottom, left, and right directions of the outer packaging body 5 and the packaging container 100. Specifically, the bottom 51 side is referred to as the lower side, and the direction in which the front portion 53 (and the back portion 54) stand up from the bottom 51 is referred to as the upper side. In addition, the left and right when the front portion 53 is arranged close to the reader's side are referred to as the left and right directions of the outer packaging body 5. Moreover, the front portion 53 side is referred to as the front side, and the back portion 54 side is referred to as the rear side. In addition, the top, bottom, left, right, and front and rear directions of the outer packaging body 5 and the packaging container 100 are consistent with the top, bottom, left, right, and front and rear directions of the packaging bag 1 accommodated therein under the main viewing angle.

[0188] like Fig.11A As shown, an opening portion 59 for opening the outer packaging body 5 is provided on the peripheral surface portion 52 of the outer packaging body 5. The outer packaging body 5 has a tear-off portion 56 on the upper side and a main body portion 57 on the lower side in the vertical direction, with the opening portion 59 as a boundary. By tearing the outer packaging body 5 in the peripheral direction at the opening portion 59 and removing the tear-off portion 56, as shown in FIG. Fig. 11B As shown, the upper part of the packaging bag 1 contained inside is exposed to the outside. The unsealing portion 59 of this embodiment is formed by forming two holes 59a separated by a predetermined width in the vertical direction on the entire circumference of the peripheral surface portion 52, and a part of the peripheral surface portion 52 is torn off in a strip shape by hand along the two holes 59a in the circumferential direction, thereby removing the tear-off portion 56. In this way, the packaging container 100 in the unsealed state of the outer packaging body 5 is heated by a microwave oven, and the content in the packaging bag 1 can be heated.

[0189] In addition, the opening portion 59 may also be other structures. For example, it may be constructed such that a hole is formed around the entire circumference of the circumferential surface portion 52, or a tear line indicating the tear-off location is printed on the opening portion 59, and the circumferential surface portion 52 is cut along the tear line around the entire circumference using a cutting tool such as scissors, thereby removing the tear-off portion 56.

[0190] The length L1 of the left-right direction of the outer packaging body 5 is, for example, 11 to 26 cm, preferably 17 to 25 cm. Specifically, L1 is, for example, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26 cm, or can be within the range between any two of the values ​​​​given as examples, for example, it can be 18.5 cm. If L1 is too large, it may not be able to be placed in a turntable microwave oven. However, if it is a packaging bag suitable for a flat-panel microwave oven, it is not limited to this. In addition, the length L2 of the upper and lower directions of the outer packaging body 5 is, for example, 10 to 26 cm, preferably 12 to 21 cm. Specifically, the length L2 is, for example, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, or 26 cm, or may be within the range between any two of the values ​​exemplified herein, for example, 14 cm.

[0191] The outer packaging body 5 is configured to be deformed into a self-supporting shape by the expansion of the packaging bag 1 during heating. Specifically, the shape of the bottom 51 of the outer packaging body 5 is deformed by the expansion of the packaging bag 1, so that after heating, the bottom 51 is used as the lower side, and the self-supporting stability of the outer packaging body 5 when it is standing is improved compared to the state before heating. The outer packaging body 5 of this embodiment is configured to be deformed in a manner that the width of the bottom 51 in the front-to-back direction becomes larger by the expansion of the packaging bag 1 during heating, and is formed into a self-supporting shape. Another way of expressing it is that the outer packaging body 5 is configured to be deformed in a manner that an opening 51b that opens downward is formed at the bottom 51 or a position adjacent to the bottom 51 during or after deformation, thereby being able to be deformed into a self-supporting shape. Specifically, the shape of the self-supporting shape is formed by expanding the width of the bottom 51 in the front-to-back direction, so that after deformation, the self-supporting stability of the outer packaging body 5 when it is standing is improved compared to the state before deformation.

[0192] Specifically, Fig.18 As shown, the front part 53 and the back part 54 of the main body 57 of the outer packaging body 5 are respectively provided with protrusions 61, and the two protrusions 61 protrude to the outside of the outer packaging body 5 due to the expansion of the packaging bag 1 when heated. The outer packaging body 5 is deformed in such a way that the protrusions 61 protrude from the front part 53 and the back part 54 to the outside of the outer packaging body 5 and form an opening 51b opening downward at a position adjacent to the bottom 51, thereby forming a self-supporting shape. In this embodiment, as Fig.17A As shown, protrusions 61 are formed at the lower end sides of the center portions in the left-right direction of the front portion 53 and the back portion 54 of the main body 57. When the packaging bag 1 expands, the two protrusions 61 protrude outward in the front-rear direction.

[0193] In the present embodiment, the front portion 53 and the back portion 54 are cut into the contour 62 of a part of the protrusion 61, and the cut-in portion can protrude as the protrusion 61. If the protrusion 61 protrudes, an opening portion 51b is formed on the inner side of the protrusion 61. In addition, instead of cutting into the contour 62, it is also possible to configure the protrusion 61 to protrude by performing easy-tear processing such as perforations along the contour 62. According to such a structure, the packaging bag 1 is not exposed to the outside at the contour 62, so it is preferable in terms of hygiene. In this case, when heating, as the packaging bag 1 expands, the easy-tear processed portion is torn and the contour 62 is cut, thereby making the protrusion 61 protrude, or the user can tear the easy-tear processed portion before heating to cut the contour 62.

[0194] When the packaging container 100 is heated, water vapor is generated inside the packaging bag 1, the internal pressure rises, and the packaging bag 1 expands. In addition, as described above, the packaging bag 1 of this embodiment is configured to be greatly expanded in the front-to-back direction at the lower end of the central portion. Therefore, the protrusion 61 is easily moved to the outside in the front-to-back direction by the lower end of the central portion of the packaging bag 1 expanding in the front-to-back direction.

[0195] Fig. 17B : is a bottom view of the outer packaging body 5, the solid line shows the outline of the bottom 51 of the outer packaging body 5 before deformation, and the double-dotted line shows the position of the outline of the bottom 51 of the outer packaging body 5 including the front end 62a of the protrusion 61 in the deformed outer packaging body 5. The width of the bottom 51 of the outer packaging body 5 in the front-to-back direction increases by the sum of the protrusion amount W1 of the protrusion 61 of the front part 53 and the protrusion amount W2 of the protrusion 61 of the back part 54 (W1+W2) in the front-to-back direction as the outer packaging body 5 deforms. Fig.18 As shown, the outer packaging body 5 deformed in this way can be self-standing with the bottom 51 facing downward and the protrusion 61 touching the ground.

[0196] like Fig.17A As shown, the profile 62 of the protrusion 61 has a front end 62a and an inclined portion 62b. The front end 62a is a portion that constitutes the front end (lower end) of the protrusion 61 and is grounded when the outer packaging body 5 is made self-supporting with the bottom 51 as the lower side. The front end 62a of this embodiment is formed in a straight line along the edge of the lower end of the front part 53 and the back part 54. The inclined portion 62b is formed in a straight line from the front end 62a toward the base end (upper end) of the protrusion 61. The angle θ of the inclined portion 62b relative to the front end 62a is, for example, 90~160°, and is preferably 110~140° in order to stably ground the protrusion 61. In this embodiment, θ=125°.

[0197] like Fig.18 As shown, the packaging container 100 is configured to be self-supporting by placing the bottom 51 of the outer packaging body 5 deformed into a self-supporting shape as the lower side. In addition, the packaging bag 1 is preferably configured to be opened in a state where the bottom 51 of the outer packaging body 5 deformed into a self-supporting shape is placed as the lower side and the packaging container 100 is self-supporting.

[0198] In this embodiment, the bottom 51 of the outer packaging body 5 deformed in such a way that the protrusion 61 protrudes is arranged as the lower side and the protrusion 61 is grounded, so that the packaging container 100 can be self-standing. In addition, in the state where the packaging container 100 is self-standing, the peripheral surface portion 21 of the packaging bag 1 is spread in the circumferential direction at the opening portion 24 and the tear-off portion 16 is removed, so that the packaging bag 1 can be opened. In this embodiment, as Fig.18As shown in the figure, the upper end of the main body 57 of the outer packaging body 5 is located below the opening portion 24 of the packaging bag 1, so that the packaging bag 1 can be easily opened at the opening portion 24. The opening 18 is formed in the main body 17 of the opened packaging bag 1. In the case where the content is food, the main body 17 of the inner packaging bag 1 can be used as tableware in a state where the packaging container 100 is made to stand on its own, and the content can be taken out from the opening 18 and eaten.

[0199] The length L3 of the main body 57 in the vertical direction is, for example, 5 to 12 cm. In addition, the ratio L3 / H2 of the length L3 to the length H2 of the main body 17 of the packaging bag 1 in the vertical direction is preferably 0.5 to 0.95, and more preferably 0.6 to 0.9. Specifically, the value of the ratio L3 / H2 is, for example, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, or may be in the range between any two of the values ​​exemplified herein. If the ratio L3 / H2 is too large, there is a possibility that the main body 57 of the outer packaging body 5 will be obstructed when the contents are taken out from the opening 18 of the packaging bag 1. If it is too small, there is a situation where the bottom 51 of the outer packaging body 5 is placed at the bottom and the stability of the packaging container 100 is insufficient when it is self-standing.

[0200] In addition, if the length of the front end portion 62a of the protrusion 61 in the left-right direction is set to L4, it is preferably 0.1≤L4 / L1, and more preferably 0.1≤L4 / L1≤0.3. Specifically, the ratio L4 / L1 is, for example, 0.1, 0.15, 0.2, 0.25, 0.3, or can be within the range between any two of the values ​​exemplified here, for example, it can be 0.14. By setting the length L4 in this way, it is possible to ensure stability when the bottom 51 of the deformed outer packaging body 5 is placed at the bottom and the packaging container 100 is made self-standing.

[0201] The outer packaging body 5 may also have a reinforcement part for maintaining a self-supporting shape. In the present embodiment, a fold line 63 extending in the vertical direction at the center of the left-right direction and two fold lines 64 extending linearly from the base end of the protrusion 61 to the outside of the left-right direction to the lower end of the front part 53 and the back part 54 are provided on the front part 53 and the back part 54 of the main body 57, and the fold lines 63 and 64 constitute reinforcement parts. The folding process is performed on the front part 53 and the back part 54 in a manner that the folds are easily bent outward at the fold lines 63 and 64. If the packaging bag 1 expands, the fold lines 63 and 64 are bent in a manner that the folds are outward, so that the protrusion 61 becomes easy to protrude in the front-back direction, and even if the packaging bag 1 shrinks after the heating is completed, the protrusion 61 is maintained. In addition, in the present disclosure, unless otherwise specified, the fold outward and the fold inward refer to the bending mode of the fold observed from the outside of the outer packaging body 5.

[0202] In addition, if Fig. 17B As shown, a crease line 65 extending in the front-back direction is provided at the center of the left-right direction on the bottom surface 51a of the outer packaging body 5. The bottom surface 51a is creased so that it is easy to bend at the crease line 65 with the crease facing outward. If the packaging bag 1 expands, the crease line 65 is bent with the crease facing outward, and the center of the bottom surface 51a in the left-right direction is slightly protruded downward. As a result, when the bottom 51 of the outer packaging body 5 is set as the lower side and is made to stand on its own, the center of the bottom surface 51a is grounded, and the outer packaging body 5 can be made to stand on its own more stably.

[0203] If the length of the bottom 51 of the deformed outer packaging body 5 in the front-to-back direction is set to L5, and the length in the left-to-right direction is set to L6, then preferably 0.1≤L5 / L6≤0.9, more preferably 0.15≤L5 / L6≤0.85, and further preferably 0.2≤L5 / L6≤0.75. Specifically, the ratio L5 / L6 is, for example, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, or within the range between any two of the values ​​exemplified herein. According to such a structure, stability can be ensured when the bottom 51 of the deformed outer packaging body 5 is used as the lower side and the packaging container 100 is made self-standing.

[0204] The outer packaging body 5 is preferably made of a material having both the flexibility of a deformable degree and the rigidity of a self-supporting degree, such as paper, synthetic paper, plastic, or a composite material of paper and plastic. When paper is used as the material, it is preferably made of cardboard including cardboard for paper containers or corrugated paper.

[0205] As described above, in the packaging container 100 of the present embodiment, the food is placed in the packaging container 100 and heated and cooked by a microwave oven. After heating, the heated packaging bag 1 is supported by the deformed outer packaging body 5 and made self-standing, thereby enabling the packaging container 100 to be self-standing and used as tableware, which is highly convenient for the user. In addition, by deforming the outer packaging body 5 into a self-standing shape, the packaging container 100 can be stably self-standing even when the food includes liquid (for example, instant noodles including soup). In addition, in the deformation of the outer packaging body 5, by forming an opening portion that opens downward at the bottom 51 or at a position adjacent to the bottom 51, the width of the outer packaging body 5 can be expanded to improve the self-standing stability. Such a deformation does not require complicated assembly, so the user can easily perform the deformation. On the other hand, the outer packaging body 5 before deformation is in a flat box shape as a whole, so it takes up little space when transporting or storing in a store, and multiple packaged foods can be easily stacked. On the other hand, the outer packaging body 5 before deformation is in a box shape as a whole, and therefore occupies little space when transported or stored in a store, and a plurality of packaged foods can be easily stacked.

[0206] In addition, the outer packaging body 5 is provided to cover at least a part of the outer surface of the packaging bag 1. Therefore, in addition to the outer packaging body 5 functioning as a heat insulating material, the heated food is not easy to cool down. Even if the food in the packaging bag 1 is at a high temperature, the packaging container 100 can be held by hand at the outer packaging body 5, and the packaging container 100 can be tilted or lifted. Moreover, in particular, when the food is instant noodles, it can be heated and cooked in a microwave oven. Therefore, the food can be provided with a good taste equivalent to instant noodles (so-called bag noodles) taken out of the packaging container 100, transferred to a pot, and then cooked in hot water.

[0207] 1-2. Cooking methods for packaged foods Next, a cooking method of packaged food in which food is housed in the packaging container 100 of the present embodiment will be described. The cooking method of the present embodiment includes a housing step, a heating step, and a self-standing step.

[0208] Before cooking, the outer packaging body 5 is unsealed. Specifically, the outer packaging body 5 is torn open at the unsealing portion 59 in the circumferential direction and the tear-off portion 56 is removed, as shown in FIG. Fig. 11B As shown, the upper part of the packaging bag 1 is exposed to the outside. Food is contained in the packaging bag 1.

[0209] In the accommodating step, the cooking liquid is placed in the packaging container 100 (more specifically, the packaging bag 1) in contact with the food and sealed. For example, when the food is instant noodles, water or liquid seasoning is placed in contact with the instant noodles as the cooking liquid. In this embodiment, the opening and closing member 23 of the packaging bag 1 is opened and the cooking liquid is placed in the packaging bag 1 from the opening 22. After the cooking liquid is placed, the packaging bag 1 is sealed by closing the opening and closing member 23. In addition, when it is not necessary to add cooking liquid when cooking the food, the accommodating step may not be performed.

[0210] In the heating process, the packaged food is heated by the microwave oven. When the cooking liquid has been added in the accommodating process, the food and the cooking liquid contained in the packaging container 100 are heated by the microwave oven. The arrangement of the packaging container 100 during heating is not particularly limited, and it is preferred to heat the packaging container 100 (more specifically, the packaging bag 1) in a lying state. The lying state of the packaging container 100 refers to a state in which the back side of the packaging container 100 is arranged as the lower side. The lying state of the packaging bag 1 refers to a state in which the back side of the packaging bag 1 is arranged as the lower side.

[0211] By laying the packaging container 100 down, the food in the packaging container 100 can be in contact with the cooking liquid over a wider area, and can be cooked efficiently. In particular, in the case of a relatively flat food such as instant noodles, the food can be in contact with the cooking liquid over a wider area than when it is not laid down. In addition, if the packaging bag 1 expands due to heating, the cooking liquid tends to be concentrated near the center of the back surface 4, and the food can be in contact with the cooking liquid more effectively. In addition, if the back side of the packaging container 100 is arranged on the lower side, the packaging bag 1 is arranged so that the steam release seal 11 provided on the front surface 3 side faces upward, so that the discharge of steam from the steam release seal 11 is not hindered. In the present embodiment, when the back side of the packaging container 100 is arranged on the lower side, the steam release seal 11 provided on the front surface 3 side is not hindered. Fig. 11B The heating process is performed in a state where the outer packaging body 5 is laid down with the back surface 54 facing downward. During the heating process, as the internal pressure of the packaging bag 1 increases, a steam flow path is formed in the steam release seal 11, and steam is discharged. In addition, the packaging bag 1 expands, thereby the protrusion 61 protrudes, and the outer packaging body 5 is deformed into a self-supporting shape.

[0212] In the self-standing step, the packaging container 100 is made to stand on its own with the bottom 51 of the packaging container 100 (more specifically, the bottom 51 of the outer packaging body 5 deformed into a self-standing shape) as the lower side. In this embodiment, the packaging container 100 after the heating step is turned from a lying state to a Fig.18The bottom 51 of the outer packaging body 5 deformed as shown in the figure stands on its own as the lower side. In other words, the packaging bag 1 heated in a lying state is supported by the deformed outer packaging body 5, thereby Fig.18 As shown, the packaging container 100 is made to stand on its own. In the state where the packaging container 100 is made to stand on its own, the packaging bag 1 is opened at the opening portion 24, so that the food inside can be eaten.

[0213] In addition, the above-mentioned process can also be performed by removing the outer packaging body 5 from the packaging container 100 and only using the packaging bag 1. That is, the accommodating process and the heating process can be performed in a state where the packaging bag 1 has been taken out of the outer packaging body 5, or can be performed in a state where the packaging bag 1 is accommodated in the outer packaging body 5 that has been opened at the opening portion 59. In this case, the same effect as that obtained in the accommodating process and the heating process can be obtained. In addition, the packaging bag 1 of this embodiment can be self-standing, so it can be made self-standing in the self-standing process.

[0214] 2. Second Implementation Next, a packaging container 100 according to a second embodiment of the present invention will be described. The packaging container 100 according to the second embodiment is different from the first embodiment in the structure of the outer packaging body 5. The following description will focus on the differences from the first embodiment.

[0215] like Fig.19A As shown, the outer packaging body 5 of the packaging container 100 of this embodiment has a bottom 51 and a peripheral surface 52 arranged in a manner of standing from the bottom 51. The peripheral surface 52 has a front portion 53 and a back portion 54 facing each other. The outer packaging body 5 is a cylindrical shape as a whole, and the packaging bag 1 is accommodated inside. The two end surfaces of the cylindrical shape (the upper surface side and the lower surface side of the outer packaging body 5) are open, and an opening is formed at the bottom 51 of the outer packaging body 5.

[0216] The outer packaging body 5 is provided with an unsealing portion 59 on the peripheral surface portion 52. By tearing the outer packaging body 5 in the peripheral direction at the unsealing portion 59 and removing the tearing portion 56, as shown in FIG. Fig.19B As shown, the upper portion of the packaging bag 1 contained inside is exposed to the outside.

[0217] The outer packaging body 5 is deformed in a manner that expands in the front-to-back direction due to the expansion of the packaging bag 1 when heated. At the bottom 51, it is deformed in a manner that the width of the opening in the front-to-back direction is expanded, thereby forming a self-supporting shape. In other words, the outer packaging body 5 is deformed in a manner that the bottom 51 is expanded in the front-to-back direction, and an opening portion 51b that opens downward is formed at the bottom 51, forming a self-supporting shape. According to such a structure, the same effect as the first embodiment can also be obtained.

[0218] 3. Third Implementation 3.1. Basic method Next, a packaging container 100 according to a third embodiment of the present invention will be described. The packaging container 100 according to the third embodiment is different from the first embodiment in the structure of the outer packaging body 5. The following description will focus on the differences from the first embodiment.

[0219] The outer packaging body 5 of the packaging container 100 of this embodiment is generally box-shaped as in the first embodiment, and contains the packaging bag 1. By tearing the outer packaging body 5 in the circumferential direction at the unsealing portion 59 and removing the tearing portion 56, as shown in FIG. Fig. 20A As shown, the upper portion of the packaging bag 1 contained inside is exposed to the outside.

[0220] like Fig.21A As shown, an assembly portion 7 is provided at the bottom 51 of the outer packaging body 5, and the bottom 51 is sealed by the assembly portion 7. Fig.21A as well as Fig. 21B As shown, the bottom 51 of the outer packaging body 5 of this embodiment includes a front bottom 71 located on the side of the front part 53, a rear bottom 72 located on the side of the back part 54, and two side bottoms 74 located at both ends in the left and right directions. The front bottom 71 is continuously arranged with the front part 53, the rear bottom 72 is continuously arranged with the back part 54, and the side bottom 74 is continuously arranged with the side part 55.

[0221] The front bottom 71 and the rear bottom 72 are assembled to form the assembly part 7. Specifically, the outer edges of the front bottom 71 and the rear bottom 72 have concave-convex shapes opposite to each other in the left-right direction. The assembly part 7 is formed by inserting the front end of the convex part of the concave-convex shape of one of the front bottom 71 and the rear bottom 72 into the concave part of the other in a manner arranged inside the outer packaging body 5. Fig.21A The front bottom 71 is bonded to the side bottom 74 by welding or the like, and at the other end of the bottom 51 ( Fig.21A The rear bottom 72 and the side bottom 74 are bonded together by welding or the like.

[0222] The outer packaging body 5 is deformed and formed into a self-supporting shape in such a way that the assembly part 7 is expanded by the expansion of the packaging bag 1 when heated. In other words, the outer packaging body 5 is deformed and formed into a self-supporting shape in such a way that the assembly part 7 is expanded and the opening part 51b opened downward is formed at the bottom 51. Specifically, when the packaging bag 1 expands, the front part 53 and the back part 54 of the outer packaging body 5 are respectively pushed outward in the front and rear directions, as shown in FIG. Fig. 21BAs shown, at the bottom 51, the assembly part 7 is unfolded in a manner that the front end of the convex shape part of one of the front bottom 71 and the rear bottom 72 is pulled out from the concave shape part of the other. As a result, the outer packaging body 5 is deformed in a manner that the width of the bottom 51 in the front-back direction is expanded and formed into a self-supporting shape. The bottom 51 of the assembly part 7 that has been unfolded has a roughly diamond-shaped outline, and an opening 51b is formed in the center. According to such a structure, the same effect as the first embodiment can be obtained.

[0223] like Fig. 20A As shown, a crease line 81 extending in the vertical direction is provided on the front part 53 and the back part 54, and a crease processing is performed at the crease line 81 so that it is easy to bend with the crease facing outward. In addition, a cutout 82 extending in the front-to-back direction continuously with the crease line 81 of the front part 53 is formed on the front bottom 71, and a cutout 83 extending in the front-to-back direction continuously with the crease line 81 of the back part 54 is formed on the rear bottom 72. According to such a structure, if the packaging bag 1 expands, the crease line 81 is bent with the crease facing outward, and the front bottom 71 and the rear bottom 72 are deformed in a manner of bending with the cutouts 82 and 83 as boundaries, so that the assembly part 7 becomes easy to unfold. In addition, in this embodiment, part of the crease line 81 constitutes a reinforcement part, and by bending the crease line 81 with the crease facing outward, it is easy to maintain the unfolding of the assembly part 7 even if the packaging bag 1 shrinks after the heating is completed.

[0224] The fold line 81 may be provided at the center of the front portion 53 and the back portion 54 in the left-right direction, but is preferably provided at a position on the opposite side of the center line of the front portion 53 and the back portion 54 in the left-right direction. Fig.21A The configuration example of such a fold line 81 is described. The fold line 81 of the front portion 53 is formed at the center ( Fig.21A The position of the dotted line J in the front part 53 and the back part 54 is deviated from the position of the length d1 to one side (the right side in this example), and the cut 82 continuous with the fold line 81 is also formed at a position deviated from the left-right center by a length d1. In addition, the fold line 81 of the back part 54 is formed at a position deviated from the left-right center to the other side (the left side in this example) by a length d2, and the cut 83 continuous with the fold line 81 is also formed at a position deviated from the left-right center by a length d2. By making the fold lines 81 of the front part 53 and the back part 54 deviate from each other in the left-right direction, the unfolding part is easy to unfold as the packaging bag 1 expands. In addition, from the viewpoint of the self-supporting stability of the outer packaging body 5 in a deformed state, it is preferred that d1=d2.

[0225] When the fold lines 81 of the front portion 53 and the back portion 54 are arranged to be offset from each other in the left-right direction in a manner of d1=d2, the front bottom portion 71 has a first front bottom portion 71a and a second front bottom portion 71b whose length in the left-right direction is smaller than that of the first front bottom portion 71a, with the cutout 82 as a boundary. In addition, the rear bottom portion 72 has a first rear bottom portion 72a and a second rear bottom portion 72b whose width in the left-right direction is smaller than that of the first rear bottom portion 72a, with the cutout 83 as a boundary. Among them, in the bonding of the above-mentioned front bottom portion 71 and the rear bottom portion 72 to the side bottom portion 74, it is preferred that the first front bottom portion 71a is bonded to the side bottom portion 74 of one side, the first rear bottom portion 72a is bonded to the side bottom portion 74 of the other side, and the second front bottom portion 71b and the second rear bottom portion 72b are not bonded to the side bottom portion 74. In other words, it is preferred that the first front bottom 71a and the second front bottom 71b, and the first rear bottom 72a and the second rear bottom 72b are respectively bonded to the side bottom 74 only at the side with a greater length in the left-right direction. In such a structure, the outer packaging body 5 after deformation is in a substantially square tube shape, has high self-supporting stability, and is easy to hold the packaging container 100 by hand at a part of the outer packaging body 5.

[0226] Furthermore, when the length of the first front bottom 71a and the first rear bottom 72a in the left-right direction is La, the length of the second front bottom 71b and the second front bottom 71b is Lb, and the length of the side bottom 74 in the front-back direction is Lc, it is preferable that (Lb+Lc)<La. In such a structure, when the outer packaging body 5 is deformed as described above to be in a substantially square tube shape, the four sides and the fold line ( Fig. 20B Compared with the width of the side including the fold 88 in the figure, the width of the side not including the fold is larger, and the strength of the outer packaging body 5 after deformation becomes higher.

[0227] 3.2. Modification 1 Next, refer to Figure 22A to Figure 24B Next, a packaging container 100 according to a first modification of the present embodiment will be described. The outer packaging body 5 according to the first modification is different from the above-described basic embodiment in the structure of the peripheral surface portion 52 .

[0228] like Fig.22A as well as Fig. 22B As shown, regarding the outer packaging body 5 of the modification 1, in the main body 57, the front part 53 is divided into a first front part 53a and a second front part 53b whose length in the left-right direction is shorter than the first front part 53a, with the fold line 81 as the boundary. In addition, the back part 54 is divided into a first back part 54a and a second back part 54b whose length in the left-right direction is shorter than the first back part 54a, with the fold line 81 as the boundary.

[0229] On the second front part 53b, the second back part 54b and the side part 55, a fold line 94 is provided along the circumference of the peripheral part 52 at a position at a predetermined distance d3 from the unsealing part 59 in the vertical direction, and a folding process is performed on the fold line 94 so that it is easy to bend in a manner where the fold line faces outward or inward. In addition, a cut line 95 is provided in a manner that the ends of one side and the other side of the fold line 94 are respectively connected to the unsealing part 59 in the vertical direction, and the fold line 94 is provided so as to be continuously provided from the second front part 53b to the adjacent side part 55. In addition, a cut line 95 is provided in a manner that the ends of one side and the other side of the fold line 94 are respectively connected to the unsealing part 59 in the vertical direction, and the fold line 94 is provided so as to be continuously provided from the second back part 54b to the adjacent side part 55. The cut line 95 may be printed with a line indicating a portion cut by a cutting tool such as scissors, or may be subjected to easy-tear processing such as perforations so as to form a cut.

[0230] At the tear-off portion 56, the front portion 53 has a lower front portion 53c extending in the up-down direction and an upper front portion 53d located above the lower front portion 53c and inclined at an angle θ2 toward the back portion 54 relative to the lower front portion 53c. The upper front portion 53d is configured to connect the upper end of the lower front portion 53c to the upper surface portion 58 of the outer packaging body 5.

[0231] The unsealing portion 59 is continuously provided on the front portion 53, the two side portions 55 and the second back portion 54b along the circumferential direction of the peripheral surface portion 52. Fig. 22B As shown, the outer packaging body 5 can be unsealed by tearing the outer packaging body 5 at the unsealing portion 59 and bending the tear-off portion 56 toward the back portion 54. In this state, the tear-off portion 56 and the second back portion 54b are separated by forming an incision 92 at the boundary, and the tear-off portion 56 is connected to the first back portion 54a.

[0232] In variation 1, if Fig.23 as well as Fig.24A As shown, by placing the outer packaging body 5 with the tear-off portion 56 bent toward the back portion 54 as the lower side, the packaging bag 1 can be placed so as to lie down in a manner inclined relative to the ground contact surface G which is a horizontal plane. When the heating process is carried out in this state, in addition to enabling efficient cooking by lying down the packaging bag 1, even if the opening 22 is accidentally opened at the opening and closing member 23 as the internal pressure of the packaging bag 1 increases, the packaging bag 1 is inclined, so that the contents are unlikely to leak to the outside.

[0233] In addition, by grounding the upper front portion 53d of the outer packaging body 5 to the grounding surface G, the entire packaging container 100 can be stably configured. For example, it is possible to avoid a situation in which the packaging container 100 swings and becomes unstable as the packaging bag 1 expands during the heating process. In addition, the inclination angle θ2 of the upper front portion 53d is, for example, 20~70°, and is preferably 30~60° in terms of stably configuring the packaging container 100, for example, it can be 45°. In addition, during the heating process, if the angle of the back portion 54 of the main body 57 relative to the grounding surface G is set to θ3, it is preferred to configure the outer packaging body 5 in a manner such that θ3<θ2. In this case, as in Fig.23 When the outer packaging body 5 is arranged in this manner, a gap 99 is formed between the back surface 54 on the tear-off portion 56 side and the back surface 54 on the main body portion 57 side. By forming the gap 99, the outer packaging body 5 can be arranged more stably, and the shaking of the packaging container 100 during the heating process can be suppressed.

[0234] like Fig.24A as well as Fig. 24B As shown, the outer packaging body 5 is deformed in a manner that the assembly portion 7 is expanded by the expansion of the packaging bag 1 when heated, and is formed into a self-supporting shape. In other words, the outer packaging body 5 is deformed in a manner that the assembly portion 7 is expanded and an opening portion 51b that opens downward is formed at the bottom 51, and is formed into a self-supporting shape. In the modification example 1, the tear-off portion 56 and the second back portion 54b are separated by the cutout 92, so that when the outer packaging body 5 is deformed into a substantially square tube shape, it is not hindered by the tear-off portion 56.

[0235] In addition, in the main body 57, a cut is formed at the position of the cut line 95, and the upper ends of the second front part 53b and the adjacent side part 55 and the upper ends of the second back part 54b and the adjacent side part 55 are folded back to the outside or inside at the fold line 94, respectively, to form a folded portion 96. In the substantially square tube shape of the outer packaging body 5 after deformation, the surface formed by the second front part 53b and the adjacent side part 55 and the surface formed by the second back part 54b and the adjacent side part 55 include folds in the vertical direction of the sides of the box shape of the outer packaging body 5 before deformation. By forming the folded portion 96, the folded portion 96 functions as a reinforcing portion, and these surfaces become difficult to bend at the fold, and the strength of the outer packaging body 5 after deformation can be improved. The length d3 of the folded portion 96 in the vertical direction is preferably 0.5 cm or more and 5 cm or less, and more preferably 1.0 cm or more and 4 cm or less.

[0236] 3.3. Modification 2 Next, refer to Figure 25A to Figure 26B, a packaging container 100 of a modification example 2 of the present embodiment will be described. The outer packaging body 5 of the modification example 2 is similar to the outer packaging body 5 of the modification example 1, but the structure of the peripheral surface portion 52 is different from that of the modification example 1. The following description will focus on the differences from the modification example 1.

[0237] like Fig.25A as well as Fig.25B As shown, in the outer packaging body 5 of the modification 2, two cut lines 97 are provided along the circumferential direction of the peripheral surface portion 52 from the second front portion 53b to the adjacent side portion 55, and the two cut lines 97 are separated from each other by a predetermined distance d4 in the vertical direction. Similarly, two cut lines 97 are provided from the second back portion 54b to the adjacent side portion 55. The cut lines 97 may be printed with a line indicating a portion to be cut using a cutting tool such as scissors, or may be subjected to easy-tear processing such as perforations, so that the cuts can be formed.

[0238] like Fig.26A as well as Fig.26B As shown, in the deformed outer packaging body 5, an incision is formed at the position of the incision line 97, and the surface between the two incision lines 97 is pushed into the inner side of the outer packaging body 5, thereby forming a push-in portion 98. In the substantially square tube shape of the deformed outer packaging body 5, the surface composed of the second front portion 53b and the adjacent side portion 55 and the surface composed of the second back portion 54b and the adjacent side portion 55 include folds in the vertical direction of the sides of the box shape of the outer packaging body 5 before deformation. By forming the push-in portion 98, the push-in portion 98 functions as a reinforcing portion, and these surfaces are difficult to bend at the fold, and the strength of the deformed outer packaging body 5 can be improved. The ratio d4 / L3 of the length d4 of the push-in portion 98 to the length L3 of the main body portion 57 in the vertical direction is preferably 0.2~0.7, and more preferably 0.3~0.6.

[0239] 4. Fourth Implementation 4.1. Basic method Next, a packaging container 100 according to a fourth embodiment of the present invention will be described. The packaging container 100 according to the fourth embodiment is different from the first embodiment in the structure of the outer packaging body 5. The following description will focus on the differences from the first embodiment.

[0240] like Fig.27A As shown, the outer packaging body 5 of the packaging container 100 of this embodiment has a bottom 51 and a peripheral surface 52 arranged to stand up from the bottom 51. The peripheral surface 52 has a front portion 53 and a back portion 54 facing each other. The outer packaging body 5 has a cylindrical shape as a whole, and is arranged to cover the main body 17 below the opening portion 24 of the packaging bag 1.

[0241] The bottom 51 of the outer packaging body 5 is provided with a folded portion 9 folded inwardly of the outer packaging body 5. Specifically, Fig.27B as well as Fig.27C The bottom member 91 shown is attached to the inner surface of the lower side of the front part 53 and the back part 54. Fig.27A The position shown by the dotted line, thereby forming the folded portion 9. Fig.27C As shown, the bottom member 91 is in a state where it is bent toward the inner side of the outer packaging body 5 at a center line E2 extending in the left-right direction (with the fold facing inward), and is attached to the inner surfaces of the front portion 53 and the back portion 54 at an attachment portion 91a formed by bending the four corners of the outer packaging body 5 toward the outside in the front-to-back direction into a triangular shape.

[0242] The outer packaging body 5 is deformed and formed into a self-supporting shape in such a way that the folded portion 9 is expanded by the expansion of the packaging bag 1 when heated. Specifically, when the packaging bag 1 expands, the front portion 53 and the back portion 54 of the outer packaging body 5 are respectively pushed outward in the front and rear directions, such as Fig.28A as well as Fig.28B As shown, the folded portion 9 is unfolded in the front-to-back direction. In addition, opening portions 51b are formed on the left and right sides of the unfolded folded portion 9. By unfolding the folded portion 9, the outer packaging body 5 is deformed in a manner that the width of the bottom 51 in the front-to-back direction is expanded and formed into a self-supporting shape. According to such a structure, the same effect as the first embodiment can be obtained. In addition, the outer packaging body 5 of the present embodiment is configured to cover the main body 17 on the lower side of the packaging bag 1, and does not cover the tear-off portion 16 on the upper side of the packaging bag 1. Therefore, there is no need to open the outer packaging body 5 in order to expose the upper part of the packaging bag 1.

[0243] In addition, if Fig.27AAs shown, the front part 53 and the back part 54 are provided with a crease line 84 extending in the vertical direction at the center in the left-right direction, and a crease process is performed at the crease line 84 so that it is easy to bend with the crease facing outward. Therefore, if the packaging bag 1 expands, the crease lines 84 of the front part 53 and the back part 54 are bent with the crease facing outward, so that the bottom 51 expands in the front-back direction, the folded part 9 is easy to unfold, and even if the packaging bag 1 shrinks after the heating is completed, it is easy to maintain the unfolding of the folded part 9. In addition, the bottom member 91 constituting the folded part 9 is provided with a crease line 85 in a manner perpendicular to the center line E2, and a crease process is performed at the crease line 85 so that it is easy to bend with the crease facing outward. If the packaging bag 1 further expands after the folded part 9 is unfolded, the folded part 9 is bent with the crease facing outward at the crease line 85, and becomes a state of protruding downward. Therefore, even if the packaging bag 1 shrinks after the heating is completed, it is easier to maintain the unfolding of the folded part 9. That is, in the present embodiment, the portions of the fold line 84 of the front portion 53 and the back portion 54 and the portions of the fold line 85 of the folded portion 9 constitute the reinforcement portion.

[0244] 4.2. Modifications Fig.29 A top view of a packaging container 100 of a modified example of the fourth embodiment is shown. The outer packaging body 5 of this modified example is different from the above-mentioned basic mode in that it is provided to cover the tear-off portion 16 in addition to the main body 17 of the packaging bag 1. The front portion 53 and the back portion 54 of the outer packaging body 5 are cut into a semicircular shape at the positions of both ends of the unsealing portion 24 of the packaging bag 1, and the tear start portion 24a is exposed to the outside. When the packaging bag 1 is unsealed after heating, the peripheral surface portion 52 of the outer packaging body 5 and the peripheral surface portion 21 of the packaging bag 1 are torn together from the tear start portion 24a along the tear line 24b. In addition, in order to make the tearing easier, perforations or other easy-tear processing can be implemented at the tearing position of the peripheral surface portion 52 of the outer packaging body 5. In addition, in order to make the tearing easier, it is preferred that the inner surface of the peripheral surface portion 52 of the outer packaging body 5 is welded to the outer surface of the packaging bag 1 at the tearing position of the peripheral surface portion 52 of the outer packaging body 5.

[0245] In addition, the front portion 53 and the back portion 54 of the outer packaging body 5 are respectively provided with an opening 52a. The opening 52a can be used as a handle when lifting the packaging container 100. The opening 52a of the front portion 53 is formed at the steam release seal portion 11 ( Fig.29The outer packaging body 5 is configured so that the outer packaging body 5 does not hinder the discharge of steam from the packaging bag 1 when heated. In addition, the opening 52a is configured so that the tear line 24b crosses the opening 52a in the left-right direction. As a result, at the opening 52a of the back portion 54, the edge of the opening 18 of the main body 17 of the opened packaging bag 1 is exposed to the outside. For example, in the case where the food includes liquid such as soup, the liquid can be drunk from the edge of the opening 18 through the opening 52a of the back portion 54. In addition, the size of the opening 52a of the back portion 54 is formed to a degree that the user's mouth does not touch the back portion 54 when drinking liquid from the edge of the opening 18, which is preferred in terms of hygiene.

[0246] In addition, the length L2 of the outer packaging body 5 in the vertical direction is, for example, 10 to 26 cm, preferably 12 to 21 cm. Specifically, the length L2 is, for example, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26 cm, or can be within the range between any two of the values ​​exemplified herein, for example, 14 cm. If L2 is too large, it may not be placed in a turntable microwave oven. However, if it is a packaging bag suitable for a flat-plate microwave oven, it is not limited thereto.

[0247] 5. Fifth Implementation Next, a packaging container 100 according to a fifth embodiment of the present invention will be described. The packaging container 100 according to the fifth embodiment is different from the first embodiment in the structure of the outer packaging body 5. The following description will focus on the differences from the first embodiment.

[0248] The outer packaging body 5 of the packaging container 100 of this embodiment is generally box-shaped as in the first embodiment, and contains the packaging bag 1. By tearing the outer packaging body 5 in the circumferential direction at the unsealing portion 59 and removing the tearing portion 56, as shown in FIG. Fig. 30A As shown, the upper portion of the packaging bag 1 contained inside is exposed to the outside.

[0249] like Fig.31A As shown in FIG. 1 , an easy-to-open portion 51c is provided on the bottom surface 51a of the outer packaging body 5 along the left-right direction. The outer packaging body 5 expands when the packaging bag 1 is heated. Fig.31B As shown in FIG. 5 , the bottom 51 is deformed in a manner that expands in the front-rear direction at the easy-opening portion 51 c to form a self-supporting shape. Fig.31BAs shown, the outer packaging body 5 is deformed into a self-supporting shape in such a way that the bottom 51 expands in the front-to-back direction at the easy-opening portion 51c, and an opening portion 51b is formed at the bottom 51. The easy-opening portion 51c is preferably configured to be opened by a relatively weak force of the expansion force of the packaging bag 1. In the present embodiment, a hole 51c1 is formed in the easy-opening portion 51c, and the lower end of the packaging bag 1 expands in the front-to-back direction when heated, whereby the hole 51c1 of the easy-opening portion 51c is cracked and the bottom 51 expands in the front-to-back direction. As a result, an opening portion 51b is formed at the bottom 51. In addition, in order to make the easy-opening portion 51c easy to crack, as shown in FIG. Fig.27A As shown, a hole 51c2 may be formed along the front-back direction. In addition, the holes 51c1 and 51c2 of the easy-opening portion 51c may be cut by hand and then heated in a microwave oven. According to such a structure, the same effect as the first embodiment can be obtained. In addition, the structure of the easy-opening portion 51c is not limited to the above example of forming the hole 51c1. For example, a line indicating the opening position may be printed on the bottom surface 51a along the left-right direction, and the user may open the seal using a cutting tool such as scissors.

[0250] In addition, if Fig. 30A As shown in FIG. 1 , the front portion 53 and the back portion 54 are provided with crease lines 86 extending in the vertical direction, and crease processing is performed at the crease lines 86 so that it is easy to bend with the crease facing outward. In addition, the side portion 55 is provided with crease lines 87 extending in the vertical direction, and crease processing is performed at the crease lines 87 so that it is easy to bend with the crease facing inward. In such a structure, if the packaging bag 1 expands, as shown in FIG. Fig. 30B As shown, the crease lines 86 of the front portion 53 and the back portion 54 are bent with the creases facing outward, and the crease lines 87 of the side portion 55 are bent with the creases facing inward, thereby making it easy for the bottom 51 to expand in the front-to-back direction at the easy-opening portion 51c. In addition, in this embodiment, the crease lines 86 and 87 constitute a reinforcement portion, and the crease lines 86 and 87 are bent, thereby making it easy to maintain the deformation even if the packaging bag 1 shrinks after heating.

[0251] The above describes various embodiments of the present invention, which are shown as examples and are not intended to limit the scope of the invention. The new embodiment can be implemented in various other ways, and various omissions, substitutions, and changes can be made without exceeding the scope of the main purpose of the invention. The embodiment or its modification is included in the scope or main purpose of the invention, and is included in the invention described in the claims and its equivalent.

[0252] 6. Sixth Implementation Next, a packaging container 100 according to a sixth embodiment of the present invention will be described. The packaging container 100 according to the sixth embodiment is different from the first embodiment in the structure of the outer packaging body 5. The following description will focus on the differences from the first embodiment.

[0253] The outer packaging body 5 of the packaging container 100 of this embodiment is generally box-shaped as in the first embodiment, and contains the packaging bag 1. By tearing the outer packaging body 5 in the circumferential direction at the unsealing portion 59 and removing the tearing portion 56, the packaging container 100 becomes Fig.32A Status shown.

[0254] In the outer packaging body 5 of the present embodiment, a fold line 89 extending in the vertical direction is provided on the front part 53 and the back part 54 of the main body 57, and a folding process is performed at the fold line 89 so as to be easily bent in a manner that the fold is facing outward. The fold lines 89 of the front part 53 and the back part 54 are provided at positions that are equidistant from the center lines of the front part 53 and the back part 54 in the left-right direction to the opposite sides. Thus, the front part 53 of the main body 57 is divided into a first front part 53a and a second front part 53b whose length in the left-right direction is shorter than the first front part 53a with the fold line 89 as a boundary. In addition, the back part 54 of the main body 57 is divided into a first back part 54a and a second back part 54b whose length in the left-right direction is shorter than the first back part 54a with the fold line 89 as a boundary.

[0255] like Fig.32A as well as Fig.32B As shown, the bottom 51 of the outer packaging body 5 has a front bottom 75 located on the side of the front part 53, a rear bottom 76 located on the side of the back part 54, and two side bottoms 79 located at both ends in the left and right directions. The front bottom 75 is continuously arranged with the front part 53, the rear bottom 76 is continuously arranged with the back part 54, and the side bottom 79 is continuously arranged with the side part 55.

[0256] The front bottom 75 is provided with a cutout 89a extending in the front-to-back direction in a continuous manner with the fold line 89 of the front portion 53, and the rear bottom 76 is provided with a cutout 89b extending in the front-to-back direction in a continuous manner with the fold line 89 of the rear portion 54. The front bottom 75 includes a first front bottom 75a and a second front bottom 75b having a smaller length in the left-right direction than the first front bottom 75a, with the cutout 89a as a boundary. The rear bottom 76 includes a first rear bottom 76a and a second rear bottom 76b having a smaller width in the left-right direction than the first rear bottom 76a, with the cutout 89b as a boundary. In addition, the first front bottom 75a and the first rear bottom 76a are provided with extensions 75c and 76c extending toward the center of the bottom 51 in the front-to-back direction, respectively.

[0257] The first front bottom 75a, the second front bottom 75b, the first rear bottom 76a, and the second rear bottom 76b are bonded to the adjacent side bottom 79 by welding or the like at one end in the left-right direction. A crease line 77a is provided at the bonding portion, and a crease processing is performed at the crease line 77a so that it is easy to bend with the crease facing inward. If the crease line 77a is bent with the crease facing inward, as shown in FIG. Fig.32A As shown, the bottom 51 is recessed in the left-right direction to form a suspended bottom. At this time, the abutting portion 77b where the front ends of the extensions 75c and 76c abut against each other is in a state that is more recessed than other parts of the bottom 51, and openings 77c are formed at both ends of the abutting portion 77b in the left-right direction. In addition, the packaging bag 1 of this embodiment is similar to the first embodiment, and the bottom film 20a is bent into a V-shape in a manner that is recessed toward the inside to form a bottom portion 2, forming a suspended bottom. Therefore, as described above, even if the bottom 51 of the outer packaging body 5 is formed as a suspended bottom, it does not affect the accommodation of the packaging bag 1.

[0258] like Fig.33A as well as Fig.33B As shown in FIG. 1 , the bottom 51 expands in the front-rear direction due to the expansion of the packaging bag 1 when heated, and the outer packaging body 5 is deformed to form an assembly portion 78 assembled in a manner to close the bottom 51, thereby becoming a self-supporting shape. Fig.33A as well as Fig.33B As shown, the outer packaging body 5 is deformed in such a way that the bottom 51 expands in the front-to-back direction, so that openings 51b1 and 51b2 that open downward are formed in the middle of the deformation at the bottom 51, and the deformation is formed into an assembly portion 78 assembled in such a way as to close the bottom 51, so as to form a self-supporting shape. Specifically, when the packaging bag 1 expands, the front portion 53 and the back portion 54 of the outer packaging body 5 are respectively pushed outward in the front-to-back direction, and the fold line 89 is bent in such a way that the fold line faces outward, thereby the front bottom 75 and the rear bottom 76 are expanded from Fig.32B The state shown in FIG. 8 is deformed in a manner that the cutouts 89a and 89b are bent as boundaries. Fig.32B In the state where the front ends are in contact with each other at the contact portion 77b, the outer surfaces (lower surfaces) of the extension portions 75c and 76c are slid against each other, as shown in FIG. Fig.33A As shown in the figure, the two sides move away from each other in the left and right directions. In the middle of such deformation, as shown in the figure, the two sides move away from each other in the left and right directions. Fig.33A As shown, the opening portion 51b1 formed by the outer edges of the first front bottom 75a, the second front bottom 75b and the first rear bottom 76a and the opening portion 51b2 formed by the outer edges of the first front bottom 75a, the first rear bottom 76a and the second rear bottom 76b are formed as openings facing downward at the bottom 51.

[0259] If from Fig.33A The state of is further deformed, as Fig.33B As shown, the extensions 75c and 76c are assembled by being inserted into the inner side of the outer packaging body 5 to form an assembly portion 78, and the bottom 51 is closed. The bottom 51 after deformation is a hexagonal shape, as shown in FIG. Fig.34 As shown, the outer packaging body 5 after deformation has a hexagonal column shape as a whole. As the deformation progresses, the width of the bottom 51 in the front-rear direction increases, thereby enabling the outer packaging body 5 to stably stand on its own. According to such a structure, the same effects as those of the first embodiment can also be obtained.

[0260] In the present embodiment, the assembly portion 78 is formed on the bottom 51 after deformation, so that even if the packaging bag 1 shrinks after heating is completed, it is easy to maintain the deformation of the outer packaging body 5. That is, in the present embodiment, the assembly portion 78 constitutes a reinforcement portion. In addition, it is preferred that the openings 51b1 and 51b2 formed in the middle of the deformation are further deformed and closed by the assembly portion 78, and no opening is formed in the bottom 51 after deformation. In such a structure, the deformation becomes easy by forming the openings 51b1 and 51b2 in the bottom 51 in the middle of the deformation. On the other hand, the strength of the outer packaging body 5 becomes higher because no opening is formed after deformation.

[0261] In addition, it is preferable that the length Le of the second front portion 53b and the second back portion 54b in the left-right direction is set equal to the length Lf of the side portion 55 in the front-back direction. Fig.33B As shown, the deformed bottom 51 becomes a bilaterally symmetrical hexagonal shape, and the outer packaging body 5 has good self-standing stability.

[0262] In addition, from the perspective of the self-supporting stability of the outer packaging body 5, the ratio Ld / Le of the length Ld of the first front portion 53a and the first back portion 54a in the left-right direction to the length Le of the second front portion 53b and the second back portion 54b in the left-right direction is preferably 1.1~3, and more preferably 1.5~2.5, for example, Ld / Le=2.

[0263] (Third point of view) 1. First Implementation 1-1. Structure of packaging container 100 like Fig.35A as well as Fig.35B As shown, a packaging container 100 according to a first embodiment of the present invention is used to contain contents such as food, and includes a packaging bag 1 formed by forming a flexible film into a bag shape and a packaging box 5a that internally contains the packaging bag 1. The packaging container 100 is suitable for containing food cooked by microwave oven as the contents, and is particularly suitable for containing instant noodles as the contents.

[0264] <Packaging bag 1> like Fig.36A as well as Fig.37 As shown, the packaging bag 1 has a bottom portion 2 and a peripheral portion 21 arranged to stand up from the bottom portion 2. The peripheral portion 21 has a front portion 3 and a back portion 4 facing each other. The front portion 3 and the back portion 4 are welded to each other at their left and right ends (hereinafter also referred to as side ends). The bottom portion 2 is welded (heat-sealed) to the front portion 3 and the back portion 4. By welding the bottom portion 2, the front portion 3 and the back portion 4 to each other, the film becomes a bag shape. The contents are accommodated inside the packaging bag 1.

[0265] The packaging bag 1 may not be self-supporting, but is preferably in a self-supporting shape. Fig.15 The bottom portion 2 formed of the bottom film 20a shown is self-supporting as the lower side. In such a structure, compared with a flat bag-shaped packaging bag in which the front portion 3 and the back portion 4 are welded at the bottom without the bottom portion 2, a larger volume can be ensured in the packaging bag 1. In addition, when the content is food, the packaging bag 1 can be self-supporting after heating and used as tableware.

[0266] Fig.37 1 is a diagram showing the packaging bag 1 in a front view. The front view refers to a state in which the packaging bag 1 is flattened without any content in the packaging bag 1 and is observed from a direction perpendicular to the front portion 3 of the packaging bag 1. Fig.37 The top, bottom, left, and right of the packaging bag 1 are described as the top, bottom, left, and right of the packaging bag 1. Specifically, the bottom surface 2 side is referred to as the bottom side, and the direction in which the front surface 3 (and the back surface 4) rises from the bottom surface 2 is referred to as the top side. In addition, the left and right when the front surface 3 is arranged on the reader's side are referred to as the left and right of the packaging bag 1. Furthermore, the front surface 3 side is referred to as the front side, and the back surface 4 side is referred to as the back side. In the following description, the top and bottom directions may be referred to as the height direction.

[0267] like Fig.36A As shown, the front portion 3 has a front lower portion 3a and a front upper portion 3b. The front lower portion 3a is welded to the bottom portion 2. The front lower portion 3a and the front upper portion 3b are welded at a palm-joining portion 10 formed by overlapping their inner surfaces. By providing the palm-joining portion 10, a large volume in the packaging bag 1 can be ensured.

[0268] like Fig.36A as well as Fig.37As shown in FIG. 1 , an upper opening portion 26, an opening and closing member 23, and an opening portion 24 are provided on the peripheral surface 21 of the packaging bag 1. The upper end welding portion 19 that welds the front portion 3 and the back portion 4 in the left-right direction is provided, so that the upper end of the packaging bag 1 of this embodiment is sealed. The upper opening portion 26 is a portion for opening the upper end of the packaging bag 1. The peripheral surface 21 is torn in the left-right direction at the upper opening portion 26 to separate the upper end side of the peripheral surface 21 including the upper welding portion 19. Fig.36A As shown, an opening 22 opening upward is formed. In such a structure, the inner surface of the packaging bag 1 is not exposed to the outside in the state before opening, which is preferable from the viewpoint of hygiene.

[0269] The upper opening portion 26 has a tear start portion 26a as a starting point when tearing the peripheral surface portion 21, and a tear line 26b printed with a line indicating the location of the tearing and opening location. The packaging bag 1 can be opened by tearing the peripheral surface portion 21 with the tear start portion 26a as a starting point, or by cutting the peripheral surface portion 21 along the tear line 26b using a cutting tool such as scissors. The tear start portion 26a is composed of, for example, a notch or a cut. In addition, instead of the tear line 26b, a half-cut line extending in the circumferential direction of the peripheral surface portion 21 can be configured, or a strip film can be configured by welding in a manner extending in the circumferential direction of the peripheral surface portion 21, and the peripheral surface portion 21 can be cut along the strip film by pulling out the strip film from the end.

[0270] The packaging bag 1 may be configured without the upper welded portion 19 and the upper opening portion 26. In this case, the front portion 3 and the back portion 4 are not welded at the upper end of the packaging bag 1 to form an opening 22, and the upper end of the packaging bag 1 does not need to be opened.

[0271] The description of the opening and closing member 23 is the same as that of the second embodiment of the first aspect. The description of the unsealing portion 24 and the steam release seal portion 11 is the same as that of the second and fourth aspects.

[0272] The length H1 of the tear-off portion 16 in the vertical direction can be, for example, 6 to 14 cm, and is 10 cm in the present embodiment. The length H2 of the main body 17 in the vertical direction can be, for example, 4 to 20 cm, preferably 6 to 18 cm, and is 7 cm in the present embodiment. If the length H2 is too small, when adding cooking liquid to the food in the packaging bag 1 for heating and cooking (for example, when adding water and seasoning to instant noodles and heating and cooking), the contents may overflow from the main body 17, and if it is too large, it is difficult to take out the contents. Moreover, it is preferred that the length H2 is longer than the length H3 from the center line E1 to the lower end of the bottom film 20a, and more preferably longer than H3 by 2 cm or more. The value of H2-H3 is, for example, 2 to 14 cm, specifically, for example, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14 cm, and may also be within the range between any two of the values ​​exemplified here. When the value of H2 - H3 is less than 2 cm, the height of the peripheral wall when the packaging bag 1 is opened becomes low, thereby limiting the amount of the content.

[0273] In addition, if FIG. 35A to FIG. 37 As shown in FIG. 1 , the peripheral surface portion 21 of the packaging bag 1 has a folded portion 25 continuously provided from the upper end with a predetermined length H5. Fig.35B As shown in FIG. 1 , the packaging bag 1 is placed in the packaging box 5a with the folded portion 25 folded downward. Fig.35B In the embodiment, the folded portion 25 is folded toward the front portion 3, but may be folded toward the back portion 4. According to such a structure, for example, when adding cooking liquid to the food in the cooking packaging bag 1, even when the length H2 of the main body 17 is large and the height of the packaging bag 1 (the length (H1+H2) in the vertical direction) is large, Fig.35A As shown, the packaging container 100 in which the packaging bag 1 is housed inside the packaging box 5a can be compact in size in the vertical direction.

[0274] In addition, in the present embodiment, the folding portion 25 is provided with the folding portion 10 having the steam release seal portion 11 and the opening and closing member 23. In addition, the upper end welded portion 19 for sealing the packaging bag 1 at the upper end and the upper side opening portion 26 for opening the upper end of the packaging bag 1 are provided in the folding portion 25. In order to provide these structures, or to sufficiently ensure the above-mentioned distances H6 and H7 in the configuration of the opening and closing member 23, even when the length H1 of the tear-off portion 16 is ensured to be large and the height of the packaging bag 1 is large, by folding the folding portion 25 and accommodating the packaging bag 1 in the packaging box 5a, the packaging container 100 can be made compact in the vertical direction. In addition, in such a structure, by accommodating the content below the folding portion 25 and folding the folding portion 25, a state can be formed in which the content is difficult to contact the steam release seal portion 11. As a result, when hard content such as instant noodles is accommodated, the content can be prevented from contacting the steam release seal portion 11 with low welding strength and damaging the packaging bag 1.

[0275] like Fig.37 As shown, the length H5 of the folded portion 25 in the vertical direction is preferably smaller than the length H1 of the tear-off portion 16. In other words, the folded portion 25 is preferably provided at a position above the unsealing portion 24. In this case, when the fold formed at the lower end of the folded portion 25 by folding the packaging bag 1 is torn at the unsealing portion 24, the tear-off portion 16 is removed together with the folded portion 25, so that when the main body 17 is used as a tableware, the opening 18 is easily opened.

[0276] The description of the bottom film 20 a and the film constituting the peripheral surface portion 21 (ie, the peripheral wall film 20 b ) is the same as that described in the second and fourth aspects.

[0277] <Packing box 5a> Fig.35A as well as Fig.35B The packaging box 5a shown corresponds to the outer packaging body 5 in the second and fourth aspects described above. The description of the outer packaging body 5 is also applicable to the packaging box 5a unless it contradicts the gist thereof.

[0278] In the vertical direction of the packaging container 100, the length (H1+H2) of the peripheral surface 21 of the packaging bag 1 is configured to be greater than the length L2 of the packaging box 5a. The difference (H1+H2-L2) between the length of the peripheral surface 21 of the packaging bag 1 and the packaging box 5 in the vertical direction is, for example, 1 to 12 cm, preferably 2 to 10 cm, and specifically, for example, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 cm, and may also be within the range between any two of the values ​​exemplified here. In such a case, it is of great significance to fold the folding portion 25 and accommodate it in the packaging box 5a.

[0279] like Fig.35BAs shown, after the unsealing portion 59 of the packaging box 5a is opened, the packaging bag 1 can be taken out from the packaging box 5a and only the packaging bag 1 can be heated by the microwave oven. When the folded portion 25 of the packaging bag 1 is unfolded and pulled out from the packaging box 5a, the packaging bag 1 and the packaging box 5a can also be heated together by the microwave oven.

[0280] 1-2. Cooking methods for packaged foods Next, a cooking method of packaged food containing food in the packaging container 100 of the present embodiment is described. The cooking method includes a containing step, a heating step, and a self-supporting step. Before cooking, the packaging box 5a is opened at the opening portion 59, and the folded portion 25 of the packaging bag 1 is unfolded. Other points are as described in the second and fourth viewpoints.

[0281] 1-3. Method for manufacturing packaging container Next, a method for manufacturing the packaging container 100 of the present embodiment will be described. This manufacturing method includes a bag making step and a housing step.

[0282] In the bag making process, a packaging bag 1 is made from a flexible film. First, Fig.38A As shown, the inner surfaces of the ends of a peripheral wall film 20b are overlapped with each other to form an overlapped portion 10a, as shown in FIG. Fig.38B As shown, the overlapping portion 10a is welded to form the joint portion 10, and the elliptical ring C is formed in the remaining portion.

[0283] Then, if Figure 38A-38B As shown in FIG. 1 , one end C1 of the ring C is cut off and inserted into the bottom film 20a bent into a V shape. Figure 38B to Figure 39A As shown, the bottom film 20 a and the peripheral wall film 20 b are welded, and the other end C2 of the ring C is cut off, thereby forming the bottom surface portion 2 , the front surface portion 3 , and the back surface portion 4 .

[0284] Then, if Fig.39B As shown, near the other end C2 of the ring C (near the upper ends of the front part 3 and the back part 4), the opening and closing member 23 is inserted between the front part 3 and the back part 4, the opening and closing member 23 is welded to the inner surface of each of the front part 3 and the back part 4, and the upper ends of the front part 3 and the back part 4 are welded, thereby manufacturing the packaging bag 1. In addition, the content such as food can be filled in the process of the bag making process, and can also be filled in the packaging bag 1 after the bag making.

[0285] In the accommodating step, the packaging bag 1 is accommodated in the packaging box 5a in a state where the folding portion 25 is folded downward to obtain the packaging container 100. In the present embodiment, during the box-making step of assembling the packaging box 5a, the packaging bag 1 in a state where the folding portion 25 is folded downward is accommodated in the packaging box 5a in an open state before the upper surface or the lower surface is closed, and thereafter, the upper surface or the lower surface of the packaging box 5a is closed, thereby obtaining the packaging container 100.

[0286] 2. Second Implementation use Fig.40A as well as Fig.40B , a second embodiment of the present invention will be described. The packaging container 100 of the second embodiment is different from the first embodiment in the structure of the packaging box 5a. The following description will focus on the differences from the first embodiment.

[0287] The packaging box 5a of this embodiment is in the shape of a hexagonal prism as a whole, and contains the packaging bag 1. The packaging box 5a has a bottom 51, which is equivalent to the bottom surface of the lower side of the hexagonal prism; a peripheral surface 52, which is equivalent to the side surface of the hexagonal prism set up from the bottom 51; and an upper surface 58, which is equivalent to the upper surface of the hexagonal prism. The peripheral surface 52 has a front portion 53 and a back portion 54 facing each other, and four side portions 55 connecting the front portion 53 and the back portion 54.

[0288] The opening portion 59 is provided along at least a portion of the outer edge of the upper surface portion 58 of the packaging box 5a, and the packaging box 5a can be opened at the opening portion 59. In the present embodiment, a hole 59a is formed along the opening portion 59, and the packaging box 5a can be opened by cutting along the hole 59a. In addition, the structure of the opening portion 59 is not limited to the above-mentioned example of forming the hole 59a. For example, a line indicating the opening position can also be printed on the opening portion 59, and the user can open it using a cutting tool such as scissors or a knife.

[0289] In addition, the opening portion 59 may be provided along the entire outer edge of the upper surface portion 58 so that the packaging box 5a can be opened by removing the upper surface portion 58. Alternatively, the opening portion 59 may be provided along a portion of the outer edge of the upper surface portion 58 (in one example, five sides other than one side 58a on the back side of the hexagonal shape of the upper surface portion 58). Fig.40B As shown, when the packaging box 5a is unsealed at the unsealing portion 59, the upper surface portion 58 is still connected to the packaging box 5a at another part of the outer edge (in one example, the edge 58a).

[0290] In addition, at the upper end of the front portion 53, there is an opening start portion 59b in the center portion in the left-right direction as a starting point for opening the opening portion 59. In one example, a hole 59b1 is formed in a substantially semicircular arc shape at the opening start portion 59b, and a finger is pressed on the opening start portion 59b so as to cut the hole 59b1 and inserted into the packaging box 5a, and the finger is pushed to push the upper surface portion 58 upward, thereby cutting the hole 59b1 of the opening portion 59 and opening the packaging box 5a.

[0291] This structure can also achieve the same effects as those of the first embodiment. In this embodiment, the packaging box 5a has a hexagonal column shape, which has particularly high self-standing stability, and the user can easily hold the packaging container 100 at the side surface 55 of the packaging box 5a.

[0292] 3. Other Implementation Methods As mentioned above, although embodiment was described, the technical idea in this disclosure can also be adopted in the following aspects.

[0293] ・The structure of the packaging box 5a that can be deformed into a self-supporting shape by the expansion of the packaging bag 1 when heated is not limited to the structure in which the protrusion 61 protrudes as in the first embodiment. For example, it is also possible to have a structure in which an assembly part assembled in a manner to close the bottom 51 of the packaging box 5a is provided, and the assembly part is deformed in a manner to expand by the expansion of the packaging bag 1 when heated, and the packaging box 5a is formed into a self-supporting shape.

[0294] Alternatively, the bottom 51 of the packaging box 5a may be provided with a folded portion folded inward of the packaging box 5a, and the folded portion may be deformed so as to expand due to expansion of the packaging bag 1 during heating, so that the packaging box 5a is formed into a self-supporting shape.

[0295] Alternatively, the packaging box 5a may be provided with an easy-opening portion in the left-right direction at the bottom 51, and the bottom 51 may be deformed to expand in the front-rear direction at the easy-opening portion due to expansion of the packaging bag 1 during heating, so that the packaging box 5a becomes self-supporting.

[0296] The above describes various embodiments of the present invention, which are shown as examples and are not intended to limit the scope of the invention. The new embodiment can be implemented in various other ways, and various omissions, substitutions, and changes can be made without exceeding the scope of the main purpose of the invention. The embodiment or its modification is included in the scope or main purpose of the invention, and is included in the invention described in the claims and its equivalent scope.

[0297] Description of Reference Numerals 1: packaging bag, 2: bottom part, 3: front part, 3a: front lower part, 3b: front upper part, 4: back part, 5: outer packaging body, 5a: packaging box, 6: main body, 7: assembly part, 9: folding part, 10: palm-joining part, 10a: overlapping part, 11: steam release sealing part, 12: side end welding part, 13: lower end welding part, 13a: slope part, 14: air bag, 15: fixing part, 16: tearing part, 17: main body, 18: opening, 19: upper end welding part, 20a: bottom film, 20b: peripheral wall film, 21: peripheral part, 22: opening, 23: opening and closing member, 23a: front side engaging member, 23a1: base, 23a2: hook, 23b: back side engaging member, 23b1 : base, 23b2: hook, 24: opening portion, 24a: tear start portion, 24b: tear line, 24c: eyelet, 24c1: inclined line, 24c2: inclined line, 24d: easy tear processing portion, 25: folding portion, 26: upper side opening portion, 26a: tear start portion, 26b: tear line, 40: peripheral wall film, 42: bottom film, 43: front film, 44: back film, 51: bottom, 51a: bottom surface, 51b: opening, 51b1: opening, 51b2: opening, 51c: easy opening portion, 51c1: eyelet, 51c2: eyelet, 52: peripheral surface, 52a: opening, 53: front portion, 53a: first front portion, 53b: second front portion, 53c: lower front : part, 53d: upper front part, 54: back part, 54a: first back part, 54b: second back part, 55: side part, 56: tear-off part, 57: main body, 58: upper surface part, 58a: edge, 59: opening part, 59a: eyelet, 59b: opening start part, 59b1: eyelet, 61: protrusion, 62: outline, 62a: front end, 62b: inclined part, 63: crease line, 64: crease line, 65: crease line, 71: front bottom, 71a: first front bottom, 71b: second front bottom, 72: rear bottom, 72a: first rear bottom, 72b: second rear bottom, 74: side bottom, 75: front bottom, 75a: first front bottom, 75b: second front bottom, 75c: extension, 76: rear bottom, 76a: first rear bottom, 76b: second rear bottom, 76c: extension, 77a: crease line, 77b: contact portion, 77c: opening, 78: assembly portion, 79: side bottom, 81: crease line, 82: cut, 83: cut, 84: crease line, 85: crease line, 86: crease line, 87: crease line, 88: crease, 89: crease line, 89a: cut, 89b: cut, 91: bottom member, 91a: attachment portion, 92: cut, 94: crease line, 95: cut line, 96: folded portion, 97: cut line, 98: push-in portion, 99: gap, 100: packaging container, 105: tear-off portion, 107: opening,125: upper opening portion, 125a: tearing start portion, 125b: easy tearing processed portion, 181: first base material layer, 182: printing layer, 183: first adhesive layer, 184: second base material layer, 184a: immersion portion, 185: second adhesive layer, 185a: immersion portion, 186: sealing layer, 187: cavity.

Claims

1. A packaging bag, the packaging bag being a packaging bag for a microwave oven formed by forming a flexible film into a bag shape, wherein: The film is composed of a first base layer, a second base layer, and a sealing layer laminated in this order via an adhesive layer. The packaging bag has a peripheral surface portion constituting a peripheral surface of the bag shape, The peripheral surface portion is provided with an opening portion, and the opening portion is used to open the packaging bag by tearing the peripheral surface portion. At the unsealed portion, the entire second base material layer and a portion of the sealant layer are subjected to easy-tear processing.

2. The packaging bag according to claim 1, wherein: The easy-tear processing is hole processing, At the unsealed portion, a hole is formed in which the entire second base material layer and a part of the sealing layer are cut in the thickness direction of the film.

3. The packaging bag according to claim 2, wherein: The perforations are formed by a plurality of cuts that are inclined with respect to a tearing direction of the peripheral surface portion and are arranged along the tearing direction.

4. The packaging bag according to claim 2 or 3, wherein: The perforations are formed such that, at a portion cut into the second base material layer, a sunken portion that is a portion of the second base material layer enters the sealing layer in the thickness direction of the film.

5. The packaging bag according to claim 2 or 3, wherein: The holes are formed so as to be cut into 5% to 80% of the thickness of the sealing layer in the thickness direction of the film.

6. The packaging bag according to any one of claims 1 to 3, wherein: The second substrate layer is composed of a stretched nylon film.

7. The packaging bag according to any one of claims 1 to 3, wherein: The peripheral surface portion includes a lower opening portion and an upper opening portion located above the lower opening portion as the opening portion.

8. The packaging bag according to claim 7, wherein: An opening and closing member is provided on the peripheral surface portion. The opening and closing member is configured to open and close an opening formed by opening the packaging bag at the upper opening portion.

9. A packaging container for a microwave oven, wherein: have: A packaging bag is formed by forming a flexible film into a bag shape, and an outer packaging body, configured to cover at least a portion of an outer surface of the packaging bag; The outer packaging body can be deformed into a self-supporting shape by the expansion of the packaging bag when heated. The packaging container can stand on its own with the bottom of the outer packaging body deformed into the above shape as the lower side.

10. The packaging container according to claim 9, wherein: The packaging bag has a steam release seal portion that forms a steam flow path as the internal pressure of the packaging bag increases.

11. The packaging container according to claim 9 or 10, wherein: The packaging bag has a bottom portion, a front portion and a back portion. The front portion and the back portion are arranged to face each other and stand upright from the bottom portion. The bottom surface portion, the front surface portion, and the back surface portion are welded to each other to form the bag shape.

12. The packaging container according to claim 9 or 10, wherein: The outer packaging body has a reinforcement portion for maintaining the self-supporting shape.

13. The packaging container according to claim 9 or 10, wherein: The outer packaging body has a front portion and a back portion which are arranged to face each other and stand up from the bottom. The front and back portions of the outer packaging body are respectively provided with protrusions that protrude outward from the outer packaging body due to expansion of the packaging bag when heated. The packaging container can stand on its own by placing the bottom of the outer packaging body deformed into the above shape as the lower side and contacting the protrusion with the ground.

14. The packaging container according to claim 9 or 10, wherein: The bottom of the outer packaging body is provided with an assembly portion assembled to close the bottom. The outer packaging body is configured to be deformed so that the assembly portion is expanded due to expansion of the packaging bag during heating, and is formed into the self-supporting shape.

15. The packaging container according to claim 9 or 10, wherein: A folded portion folded inwardly of the outer packaging body is provided at the bottom of the outer packaging body. The outer packaging body is configured to be deformed so that the folded portion is expanded due to expansion of the packaging bag during heating, and is formed into the self-supporting shape.

16. The packaging container according to claim 9 or 10, wherein: An easy-opening portion is provided at the bottom of the outer packaging body along the left-right direction. The outer packaging body is configured to be deformed into the self-supporting shape such that the bottom portion expands in the front-rear direction at the easy-opening portion due to expansion of the packaging bag during heating.

17. The packaging container according to claim 9 or 10, wherein: The outer packaging body is configured to be deformed into the self-supporting shape by expansion of the packaging bag during heating so that the bottom portion expands in the front-rear direction to form an assembled portion assembled to close the bottom portion.

18. A packaged food, wherein: A food and a packaging container according to claim 9 or 10, The food is contained in the packaging bag.

19. The packaged food according to claim 18, wherein The food is instant noodles.

20. A method for cooking a packaged food, wherein the packaged food is the packaged food according to claim 18, wherein: The cooking method of packaged food comprises a heating step and a self-supporting step. In the heating step, the packaged food is heated by a microwave oven in a state where the outer packaging body is laid down. In the self-standing step, the packaging container is made to stand on its own with the bottom of the outer packaging body facing downward.

21. A method for cooking packaged food, wherein: It has a storage process, a heating process and a self-supporting process. The packaged food comprises a packaging container and the food contained in the packaging container. In the accommodating step, the cooking liquid is placed in the packaging container in contact with the food and the packaging container is sealed. In the heating step, the food and the cooking liquid contained in the packaging container are heated by a microwave oven. In the self-standing step, the packaging container is made self-standing with the bottom of the packaging container as the lower side. The packaging container has a steam release seal portion that forms a steam flow path as the internal pressure of the packaging container increases.

22. The cooking method according to claim 21, wherein: In the heating step, the food and the cooking liquid are heated by a microwave oven in a state where the packaging container is laid down.

23. The cooking method according to claim 21 or 22, wherein: The packaging container comprises: a packaging bag formed of a flexible film in a bag shape, and an outer packaging body arranged to cover at least a portion of the outer surface of the packaging bag; The food is contained in the packaging bag. The outer packaging body can be deformed into a self-supporting shape by the expansion of the packaging bag during heating in the heating step. The packaging container can stand on its own with the bottom of the outer packaging body deformed into the shape as the lower side.

24. The cooking method according to claim 21 or 22, wherein The food is instant noodles.

25. A packaging container, wherein: have: A packaging bag is formed by forming a flexible film into a bag shape, and A packaging box, containing the packaging bag inside, The packaging bag has a bottom surface and a peripheral surface arranged to stand upright from the bottom surface. In the vertical direction of the packaging container, the length of the peripheral surface portion is greater than the length of the packaging box. The peripheral surface portion has a folded portion of a predetermined length continuously provided from the upper end. The packaging bag is housed in the packaging box in a state where the folded portion is folded downward.

26. The packaging container according to claim 25, wherein The peripheral surface portion has a steam release seal portion that forms a steam flow path as the internal pressure of the packaging bag increases. The steam release seal is disposed at the folded portion.

27. The packaging container according to claim 25 or 26, wherein: The peripheral surface portion has an opening portion opening upward and an opening and closing member configured to open and close the opening portion. The opening and closing member is provided at the folding portion.

28. The packaging container according to claim 25 or 26, wherein: The difference between the length of the peripheral surface portion in the vertical direction of the packaging container and the length of the packaging box is 1 to 12 cm.

29. The packaging container according to claim 25 or 26, wherein: The packaging box can be deformed into a self-supporting shape by the expansion of the packaging bag when heated. The packaging container can stand on its own with the bottom of the packaging box deformed into the above shape as the lower side.

30. A packaged food, wherein: A food and a packaging container according to claim 25 or 26, The food is contained in the packaging bag.

31. The packaged food product according to claim 30, wherein: The food is instant noodles.

32. A method for cooking a packaged food, wherein the packaged food is the packaged food according to claim 30, wherein: The cooking method of packaged food comprises a accommodating step and a heating step. In the accommodating step, the cooking liquid is placed in the packaging container in contact with the food and the packaging container is sealed. In the heating step, the food and the cooking liquid contained in the packaging container are heated by a microwave oven.

33. A packaging container, wherein: have: A packaging bag for a microwave oven is formed by forming a flexible film into a bag shape, and an outer packaging body, configured to cover at least a portion of an outer surface of the packaging bag; The outer packaging body is deformed in a manner such that an opening portion opening downward is formed at the bottom or at a position adjacent to the bottom during or after the deformation, and can be deformed into a self-supporting shape. The packaging container can stand on its own with the bottom of the outer packaging body deformed into the shape as the lower side.

34. The packaging container according to claim 33, wherein: The packaging bag has a steam release seal portion that forms a steam flow path as the internal pressure of the packaging bag increases.

35. The packaging container according to claim 33 or 34, wherein: The packaging bag has a bottom portion, a front portion and a back portion. The front portion and the back portion are arranged to face each other and stand upright from the bottom portion. The bottom surface portion, the front surface portion, and the back surface portion are welded to each other to form the bag shape.

36. The packaging container according to claim 33 or 34, wherein: The outer packaging body has a reinforcement portion for maintaining the self-supporting shape.

37. The packaging container according to claim 33 or 34, wherein: The outer packaging body has a front portion and a back portion which are arranged to face each other and stand upright from the bottom. The outer packaging body is configured such that the protrusions protrude from the front and back portions of the outer packaging body toward the outside of the outer packaging body, respectively, and are deformed in such a manner that the opening is formed at a position adjacent to the bottom, thereby forming the shape capable of being self-supporting. The packaging container can be self-standing by placing the bottom of the outer packaging body deformed into the above shape at the lower side and contacting the protrusion with the ground.

38. The packaging container according to claim 33 or 34, wherein: The bottom of the outer packaging body is provided with an assembly portion assembled to close the bottom. The outer packaging body is configured to be formed into the self-supporting shape by deforming so that the assembly portion is unfolded and the opening portion is formed in the bottom portion.

39. The packaging container according to claim 33 or 34, wherein: A folded portion folded inwardly of the outer packaging body is provided at the bottom of the outer packaging body. The outer packaging body is configured to be formed into the self-supporting shape by deforming so that the folded portion is unfolded and the opening portion is formed at the bottom portion.

40. The packaging container according to claim 33 or 34, wherein: An easy-opening portion is provided at the bottom of the outer packaging body along the left-right direction. The outer packaging body is configured to be formed into the self-supporting shape by deforming so that the bottom portion is expanded in the front-rear direction at the easy-opening portion to form the opening portion at the bottom portion.

41. The packaging container according to claim 33 or 34, wherein: The outer packaging body is deformed in such a manner that the bottom expands in the front-to-back direction, and in the middle of the deformation, it is deformed in such a manner that the opening portion opening downward is formed at the bottom, and an assembly portion assembled to close the bottom is formed, and the outer packaging body is formed into the shape that can be self-supporting.

42. A packaged food, wherein: A food and a packaging container according to claim 33 or 34, The food is contained in the packaging bag.

43. The packaged food product according to claim 42, wherein The food is instant noodles.

44. A method for cooking a packaged food, wherein the packaged food is the packaged food according to claim 42, wherein: The cooking method of packaged food comprises a heating step and a self-supporting step. In the heating step, the packaging bag is heated by a microwave oven in a lying state. In the self-standing step, the packaging container is made to stand on its own with the bottom of the outer packaging body deformed into the shape facing downward.

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