Containers and packaging

Abstract

To provide a container and packaged body with a lid that is less likely to be punctured.SOLUTION: A container 20 includes: a body 100 with a content provided therein; a flange 200 that is provided on the outer periphery of the body 100 and includes a sealing surface 230 that the lid is adhered to; and a projection structure 300 provided on the flange 200. The flange 200 includes multiple prioritized parts P. The projection structure 300 includes multiple ribs 310 that project against the sealing surface 230. The prioritized part P is a part where a steam passing part that steam passes through is easy to be formed in comparison with a non-prioritized part Q. Multiple prioritized parts P include at least two first type prioritized parts PA and at least one second type prioritized part PB. Multiple ribs 310 are provided on parts of the flange 200 including the first type prioritized parts PA, but are not provided on a part of the flange 200 including the second type prioritized part PB.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a package including a vapor venting structure and a container therefor. [Background technology]

[0002] The package including the steam release structure contains contents such as food. In one example, the package includes a container and a bag. The contents are placed in the container. The container is housed in the bag. A slit is formed in the bag so that the bag does not penetrate. When the package is heated, steam is generated from the contents. The pressure inside the bag rises. The rise in pressure causes the bag to rupture at the slit, forming a vapor passage part in the bag through which steam can pass. The vapor inside the bag flows to the outside of the bag through the vapor passage part. Patent Document 1 shows an example of a conventional package. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 4817583 Summary of the Invention [Problem to be solved by the invention]

[0004] In conventional packages, the bag may break at the slit and form a hole in the bag due to reasons other than heating of the package, such as the force applied to the package when it is carried. [Means for solving the problem]

[0005] The container of the present invention comprises a main body in which the contents are placed, a flange provided on the outer periphery of the main body and including a sealing surface to which a lid is adhered, and a protruding structure provided on the flange, wherein the flange includes a plurality of preferential portions, and the protruding structure includes a plurality of ribs protruding from the sealing surface, the preferential portions are portions in which a vapor-passing portion through which vapor passes is more likely to form than the non-preferential portions of a container configured so that the flange includes non-preferential portions, the plurality of preferential portions include at least two first-type preferential portions and at least one second-type preferential portion, and the plurality of ribs are provided in the portion of the flange including the first-type preferential portions and are not provided in the portion of the flange including the second-type preferential portions.

[0006] This container can achieve the following effects, for example: A package is manufactured by placing contents in the body of the container and adhering a lid to the flange of the container. When the package is heated in a closed state, in which the container is closed with the lid, steam generated from the contents increases the pressure inside the package. As the pressure increases, a portion of the lid peels off from the sealing surface. As a result of the peeling of the portion of the lid, a vapor passage portion is formed in a portion of the flange that includes the priority portion.

[0007] In conventional packages in which a slit for forming a vapor passage portion is formed in a bag, the bag is the portion where the vapor passage portion is intended to be formed. In a package including the present container, the lid and flange are the portions where the vapor passage portion is intended to be formed. Compared to conventional packages, in the package including the present container, holes are less likely to be formed in the lid, which is the portion where the vapor passage portion is intended to be formed.

[0008] Since the flange is provided with ribs, the ribs can be used as a marker for where to start peeling the lid. This improves the convenience of the package. Since the flange is provided with multiple ribs, when a vapor passage portion is formed in a portion corresponding to one of the multiple ribs, the other ribs can be used as a marker for where to start peeling the lid.

[0009] In one example of the container, the number of the second-type priority portions included in the plurality of priority portions is one. The present container provides the following advantages, for example: The number of ribs that can be used as markers for where to start peeling the lid is increased; The convenience of the package is improved.

[0010] In one example of the container, the height of the ribs is in the range of 0.1 mm or greater. The present container provides the following advantages, for example: When the lid is adhered to the flange, the ribs are easily perceived when the lid is touched with the hand.

[0011] In one example of the container, the height of the ribs is in the range of 0.2 mm or greater. This container provides the following advantages, for example: The seal strength of the portion of the flange that includes the first-type priority portion is higher than the seal strength of the portion of the flange that includes the second-type priority portion; When the closed package is heated, a vapor passage portion is more likely to form in the portion of the flange that includes the second-type priority portion than in the portion of the flange that includes the first-type priority portion; and Stability is increased regarding the position where the vapor passage portion is formed in the package.

[0012] In one example of the container, the height of the ends of the ribs decreases as they approach the tips of the ribs. The present container provides the following advantages, for example: The lid is firmly attached to the sealing surface around the end of the rib, and when the package is closed, the contents are less likely to leak from the inside of the package to the outside of the package.

[0013] In one example of the container, the height of the ribs is in the range of 1.5 mm or less. The present container provides the following advantages, for example: The lid is firmly attached to the sealing surface around the rib, and when the package is closed, the contents are less likely to leak from the inside of the package to the outside of the package.

[0014] In one example of the container, the height of the ribs decreases from the top of the ribs toward the outer periphery of the flange. The present container provides the following advantages, for example: When peeling the lid from a part of the lid corresponding to the part of the flange that includes the first-type priority portion, the lid is easily peeled from the flange.

[0015] In one example of the container, the flange includes a plurality of sides and a plurality of nodes, the plurality of sides include a first side, a second side, a third side, and a fourth side, the plurality of nodes include a first node, a second node, a third node, and a fourth node, the first node is a portion where a first end of the first side and a first end of the third side are connected, the second node is a portion where a second end of the first side and a first end of the fourth side are connected, the third node is a portion where a first end of the second side and a second end of the third side are connected, and the fourth node is a portion where a The second end is a portion connecting the second end of the fourth side, the plurality of priority portions include three of the first type priority portions and one of the second type priority portions, the first node to the third node are portions of the flange that include the first type priority portions, the fourth node is a portion of the flange that includes the second type priority portion, the plurality of ribs include a first rib, a second rib, and a third rib, the first rib is provided at the first node, the second rib is provided at the second node, and the third rib is provided at the third node.

[0016] The present container provides the following advantages, for example: Since the flange has a rib at its joint, the rib can be used as a guide when starting to peel off the lid from the part of the lid that corresponds to the joint.

[0017] The package according to the present invention comprises the container and a lid that is adhered to the flange. The present packaging body has the following advantages, for example: Compared to conventional packaging bodies, the present container is less likely to have holes formed in the lid, which is the portion where the vapor passage is intended to be formed. [Effects of the Invention]

[0018] According to the container and package of the present invention, holes are less likely to form in the lid. [Brief explanation of the drawings]

[0019] [Figure 1] FIG. 2 is a plan view of the packaging body of the first embodiment. [Figure 2] FIG. [Figure 3] Cross section of a vessel parallel to the horizontal direction. [Figure 4] Cross section of a vessel parallel to its longitudinal direction. [Figure 5] Plan view of a node in a steam-passing state. [Figure 6] Cross-sectional view taken along line 6-6 in Figure 5. [Figure 7] Plan view of the node. [Figure 8] FIG. 4 is a cross-sectional view showing a first cross section of the rib. [Figure 9] FIG. 10 is a cross-sectional view showing a second cross section of the rib. [Figure 10] FIG. 10 is a cross-sectional view showing a first cross section of a rib according to a second embodiment. [Figure 11] FIG. 10 is a cross-sectional view showing a first cross section of a rib according to a third embodiment. [Figure 12] FIG. 10 is a cross-sectional view showing a first cross section of a rib according to a fourth embodiment. [Figure 13] FIG. 11 is a cross-sectional view showing a first cross section of a rib according to a fifth embodiment. [Figure 14] FIG. 13 is a plan view of a joint of the sixth embodiment. [Figure 15] FIG. 13 is a plan view of a joint of the eighth embodiment. [Figure 16] FIG. 13 is a plan view of a joint of the ninth embodiment. [Figure 17] FIG. 10 is a diagram showing the results of a measurement test. DETAILED DESCRIPTION OF THE INVENTION

[0020] (First embodiment) Referring to FIG. 1 , the package 10 includes a container 20 and a lid 30. The package 10 packages a content 11. The container 20 is configured so that the content 11 can be placed therein. The lid 30 is adhered to the container 20. An example of the content 11 is food. An example of the food is frozen food. The package 10 includes a steam release structure. The steam release structure is configured so that steam generated from the content 11 when the package 10 is heated can be released to the outside of the package 10.

[0021] The package 10 can be in a closed state, for example. In the closed state of the package 10, for example, the following state can be seen: The lid 30 is glued to the container 20. The container 20 is closed by the lid 30. When the contents 11 are placed in the container 20, the contents 11 cannot be removed from the container 20.

[0022] The packaging body 10 can be in a steam-passing state, for example. When the packaging body 10 is in a closed state and heated, the state of the packaging body 10 transitions from the closed state to the steam-passing state. When the packaging body 10 is in a steam-passing state, for example, the following can be observed. A part of the lid 30 adhered to the container 20 is peeled off from the container 20. A steam-passing portion 40 (see FIG. 5) is formed in the part where the lid 30 has peeled off.

[0023] The package 10 can be in an open state, for example. When the lid 30 is peeled off the container 20 to the extent that the contents 11 can be removed from the container 20, the state of the package 10 transitions from the closed state or the steam-passing state to the open state. When the package 10 is in the open state, for example, the following can be observed: The lid 30 is peeled off from the container 20. The container 20 is open. If the contents 11 are placed in the container 20, the contents 11 can be removed from the container 20.

[0024] In describing package 10, reference will be made to the X1, X2, Y1, Y2, Z1, and Z2 directions. The X1 direction and the X2 direction are parallel to the X axis. The X1 direction is opposite to the X2 direction. The X direction collectively refers to the X1 direction and the X2 direction. The lateral direction of the package 10 is parallel to the X direction. The Y1 direction and the Y2 direction are parallel to the Y axis. The Y1 direction is opposite to the Y2 direction. The Y direction collectively refers to the Y1 direction and the Y2 direction. The longitudinal direction of the packaging body 10 is parallel to the Y direction. The Z1 direction and the Z2 direction are parallel to the Z axis. The Z1 direction is the opposite direction to the Z2 direction. The Z direction collectively refers to the Z1 direction and the Z2 direction. The height direction of the packaging body 10 is parallel to the Z direction. The radial direction of the packaging body 10 is perpendicular to the Z direction. The plane defined by the X and Y directions is referred to as the "first reference plane." The plane defined by the X and Z directions is referred to as the "second reference plane." The plane defined by the Y and Z directions is referred to as the "third reference plane."

[0025] Please refer to Figures 2 to 4. The configuration of the container 20 can be selected arbitrarily. The configuration of the container 20 is not limited to the configuration exemplified. Examples of materials for the container 20 include thermoplastic resins. Examples of thermoplastic resins include polyethylene, polypropylene, polystyrene, and polyethylene terephthalate resins.

[0026] The container 20 includes a main body 100. The configuration of the main body 100 can be selected arbitrarily. The configuration of the main body 100 is not limited to the configuration illustrated. The shape of the main body 100 is non-circular. In the illustrated example, the shape of the main body 100 is rectangular. The main body 100 includes a bottom 110, side portions 120, and an opening 130. An arrangement space 101 is formed inside the main body 100. The inner surface 110A of the bottom portion 110 and the inner surface 120A of the side portions 120 define the arrangement space 101. The opening 130 is provided at the end of the side portion 120. The opening 130 opens the arrangement space 101 to the outside of the container 20. The contents 11 are put in and taken out of the arrangement space 101 through the opening 130.

[0027] The bottom 110 is parallel to the first reference plane. The bottom 110 is configured so that the contents 11 can be placed thereon. The bottom 110 includes a first end 111, a second end 112, a third end 113, and a fourth end 114. The first end 111 and the second end 112 are ends in the X direction. The third end 113 and the fourth end 114 are ends in the Y direction.

[0028] The first end 111 is located in the X1 direction relative to the center of the container 20 in the X direction. The second end 112 is located in the X2 direction relative to the center of the container 20 in the X direction. The third end 113 is located in the Y1 direction relative to the center of the container 20 in the Y direction. The fourth end 114 is located in the Y2 direction relative to the center of the container 20 in the Y direction.

[0029] The side portion 120 includes a first side portion constituent portion 121, a second side portion constituent portion 122, a third side portion constituent portion 123, and a fourth side portion constituent portion 124. The first side portion constituent portion 121 is located in the X1 direction with respect to the center of the container 20 in the X direction. The second side portion 122 is located in the X2 direction with respect to the center of the container 20 in the X direction. The third side portion 123 is located in the Y1 direction with respect to the center of the container 20 in the Y direction. The fourth side portion 124 is located in the Y2 direction with respect to the center of the container 20 in the Y direction.

[0030] The first side component 121 is inclined with respect to the third reference plane. The first side component 121 is inclined so that it progresses in the X1 direction as it progresses in the Z1 direction. The second side component 122 is inclined with respect to the third reference plane. The second side component 122 is inclined so that it progresses in the X2 direction as it progresses in the Z1 direction. The distance between the first side component 121 and the second side component 122 in the X direction increases as it progresses in the Z1 direction.

[0031] The third side component 123 is inclined with respect to the second reference plane. The third side component 123 is inclined so that it progresses in the Y1 direction as it progresses in the Z1 direction. The fourth side component 124 is inclined with respect to the second reference plane. The fourth side component 124 is inclined so that it progresses in the Y2 direction as it progresses in the Z1 direction. The distance between the third side component 123 and the fourth side component 124 in the Y direction increases as it progresses in the Z1 direction.

[0032] The first side component 121 includes a first end 121A and a second end 121B. The first end 121A and the second end 121B are ends in the Z direction. The first end 121A is located in the Z1 direction relative to the center of the first side component 121 in the Z direction. The second end 121B is located in the Z2 direction relative to the center of the first side component 121 in the Z direction. The second end 121B is connected to the first end 111 of the bottom 110.

[0033] The second side component 122 includes a first end 122A and a second end 122B. The first end 122A and the second end 122B are ends in the Z direction. The first end 122A is located in the Z1 direction relative to the center of the second side component 122 in the Z direction. The second end 122B is located in the Z2 direction relative to the center of the second side component 122 in the Z direction. The second end 122B is connected to the second end 112 of the bottom 110.

[0034] The third side component 123 includes a first end 123A and a second end 123B. The first end 123A and the second end 123B are ends in the Z direction. The first end 123A is located in the Z1 direction relative to the center of the third side component 123 in the Z direction. The second end 123B is located in the Z2 direction relative to the center of the third side component 123 in the Z direction. The second end 123B is connected to the third end 113 of the bottom 110.

[0035] The fourth side component 124 includes a first end 124A and a second end 124B. The first end 124A and the second end 124B are ends in the Z direction. The first end 124A is located in the Z1 direction relative to the center of the fourth side component 124 in the Z direction. The second end 124B is located in the Z2 direction relative to the center of the fourth side component 124 in the Z direction. The second end 124B is connected to the fourth end 114 of the bottom 110.

[0036] The opening 130 includes a first end 121A of the first side component 121, a first end 122A of the second side component 122, a first end 123A of the third side component 123, and a first end 124A of the fourth side component 124.

[0037] The container 20 includes a flange 200. The configuration of the flange 200 can be selected arbitrarily. The configuration of the flange 200 is not limited to the configuration illustrated. The flange 200 is provided on the outer periphery of the main body 100. In one example, the flange 200 is provided on the outer periphery of the opening 130. The shape of the flange 200 is a ring that corresponds to the shape of the main body 100. In the example shown, the flange 200 includes a plurality of sides 210. The plurality of sides 210 include a first side 210A, a second side 210B, a third side 210C, and a fourth side 210D. The first side 210A to the fourth side 210D have equal lengths.

[0038] Side 210 includes a first end 211, a second end 212, and an intermediate portion 213. First end 211 is one end in the X direction or the Y direction. First end 211 includes an arc portion and a straight portion. Second end 212 is the other end in the X direction or the Y direction. Second end 212 includes an arc portion and a straight portion.

[0039] The arc portion of the first end 211 connects to the arc portion of the first end 211 of the adjacent side 210 or the arc portion of the second end 212 of the adjacent side 210. The arc portion of the second end 212 connects to the arc portion of the first end 211 of the adjacent side 210 or the arc portion of the second end 212 of the adjacent side 210.

[0040] The intermediate portion 213 is located between the first end 211 and the second end 212. The intermediate portion 213 includes a straight portion. The center line of the intermediate portion 213 is parallel to the X direction or the Y direction. The intermediate portion 213 connects to the straight portion of the first end 211 and the straight portion of the second end 212.

[0041] The first side 210A is located in the X1 direction relative to the center of the container 20 in the X direction. The first end 211 of the first side 210A is located in the Y1 direction relative to the center of the first side 210A in the Y direction. The second end 212 of the first side 210A is located in the Y2 direction relative to the center of the first side 210A in the Y direction. The center line of the middle portion 213 of the first side 210A is parallel to the Y direction.

[0042] The second side 210B is located in the X2 direction relative to the center of the container 20 in the X direction. The first end 211 of the second side 210B is located in the Y1 direction relative to the center of the second side 210B in the Y direction. The second end 212 of the second side 210B is located in the Y2 direction relative to the center of the second side 210B in the Y direction. The center line of the middle portion 213 of the second side 210B is parallel to the Y direction.

[0043] The third side 210C is located in the Y1 direction relative to the center of the container 20 in the Y direction. The first end 211 of the third side 210C is located in the X1 direction relative to the center of the third side 210C in the X direction. The second end 212 of the third side 210C is located in the X2 direction relative to the center of the third side 210C in the X direction. The center line of the middle portion 213 of the third side 210C is parallel to the X direction.

[0044] The fourth side 210D is located in the Y2 direction relative to the center of the container 20 in the Y direction. The first end 211 of the fourth side 210D is located in the X1 direction relative to the center of the fourth side 210D in the X direction. The second end 212 of the fourth side 210D is located in the X2 direction relative to the center of the fourth side 210D in the X direction. The center line of the middle portion 213 of the fourth side 210D is parallel to the X direction.

[0045] The flange 200 includes a plurality of nodes 220. The nodes 220 are portions where adjacent sides 210 connect to each other. In the illustrated example, the plurality of nodes 220 include a first node 221, a second node 222, a third node 223, and a fourth node 224.

[0046] The first node 221 includes the first end 211 of the first side 210A and the first end 211 of the third side 210C. The first end 211 of the first side 210A and the first end 211 of the third side 210C are connected at the first node 221. The first node 221 corresponds to a corner of the flange 200. The center of the arc at the first node 221 is defined in the space of the opening 130.

[0047] The second node 222 includes the second end 212 of the first side 210A and the first end 211 of the fourth side 210D. The second end 212 of the first side 210A and the first end 211 of the fourth side 210D are connected at the second node 222. The second node 222 corresponds to a corner of the flange 200. The center of the arc at the second node 222 is defined in the space of the opening 130.

[0048] The third node 223 includes the first end 211 of the second side 210B and the second end 212 of the third side 210C. The first end 211 of the second side 210B and the second end 212 of the third side 210C are connected at the third node 223. The third node 223 corresponds to a corner of the flange 200. The center of the arc at the third node 223 is defined in the space of the opening 130.

[0049] The fourth node 224 includes the second end 212 of the second side 210B and the second end 212 of the fourth side 210D. The second end 212 of the second side 210B and the second end 212 of the fourth side 210D are connected at the fourth node 224. The fourth node 224 corresponds to a corner of the flange 200. The center of the arc at the fourth node 224 is defined in the space of the opening 130.

[0050] The flange 200 includes a sealing surface 230. The sealing surface 230 is the surface to which the lid 30 is adhered. In one example, the sealing surface 230 is flat. The lid 30 is adhered to the sealing surface 230 by, for example, heat sealing. When the lid 30 is adhered to the sealing surface 230, the opening 130 is closed by the lid 30. The state of the package 10 is closed.

[0051] The flange 200 includes an inner periphery 201 and an outer periphery 202. The inner periphery 201 is the portion of the flange 200 closer to the opening 130. The inner periphery 201 includes an inner peripheral edge 201A. The inner peripheral edge 201A is the edge of the flange 200 located closer to the opening 130. The outer periphery 202 is the portion of the flange 200 closer to the outer periphery. The outer periphery 202 includes an outer peripheral edge 202A. The outer peripheral edge 202A is the edge of the flange 200 located closer to the outer periphery of the flange 200. The sealing surface 230 is provided between the inner periphery 201A and the outer peripheral edge 202A. In one example, the width of the flange 200 is indicated by the distance between the inner periphery 201A and the outer peripheral edge 202A.

[0052] The flange 200 includes a side portion 240. The side portion 240 is connected to the outer peripheral edge 202A. The side portion 240 is located in the Z2 direction relative to the outer peripheral edge 202A. The side portion 240 is configured to go around the outer peripheral edge 202A of the flange 200.

[0053] The lid 30 is a resin sheet. The lid 30 includes multiple films. The multiple films are laminated. In one example, the lid 30 includes an outer layer, an intermediate layer, and an inner layer. The outer layer is made of, for example, a film with excellent transparency and gas barrier properties. The intermediate layer is made of, for example, a film with excellent gas barrier properties. The inner layer is made of, for example, an easy-peel film.

[0054] The container 20 includes a protruding structure 300. The configuration of the protruding structure 300 can be selected arbitrarily. The configuration of the protruding structure 300 is not limited to the configuration illustrated. The protruding structure 300 is provided on the flange 200. The protruding structure 300 includes at least one rib 310. In the illustrated example, the protruding structure 300 includes a plurality of ribs 310.

[0055] The configuration of the ribs 310 can be selected arbitrarily. The configuration of the ribs 310 is not limited to the configuration exemplified above. The multiple ribs 310 include a first rib 310A, a second rib 310B, and a third rib 310C. The ribs 310 collectively refer to the first rib 310A to the third rib 310C. The ribs 310 are provided at the joints 220 of the flange 200. The shape of the ribs 310 follows the shape of the flange 200. The ribs 310 protrude from the sealing surface 230.

[0056] The first rib 310A is provided on the first section 221. The first rib 310A follows the shape of the first section 221. The first rib 310A protrudes in the Z1 direction relative to the sealing surface 230 of the first section 221. The sealing surface 230 of the first section 221 includes the sealing surface 230 of the first end 211 of the first side 210A and the sealing surface 230 of the first end 211 of the third side 210C.

[0057] The second rib 310B is provided on the second section 222. The second rib 310B follows the shape of the second section 222. The second rib 310B protrudes in the Z1 direction relative to the sealing surface 230 of the second section 222. The sealing surface 230 of the second section 222 includes the sealing surface 230 of the first end 211 of the second side 210B and the sealing surface 230 of the second end 212 of the third side 210C.

[0058] The third rib 310C is provided on the third section 223. The third rib 310C follows the shape of the third section 223. The third rib 310C protrudes in the Z1 direction relative to the sealing surface 230 of the third section 223. The sealing surface 230 of the third section 223 includes the sealing surface 230 of the second end 212 of the first side 210A and the sealing surface 230 of the first end 211 of the third side 210C.

[0059] Please refer to Figures 5 and 6. Figure 5 shows a plan view of the joint 220 in which the vapor passage portion 40 is formed. Figure 6 shows a cross section taken along line 6-6 in Figure 5. When the package 10 in a closed state is heated, steam generated from the contents 11 increases the pressure in the placement space 101 inside the package 10. As the pressure increases, a portion of the lid 30 peels off from the sealing surface 230. The peeling of the portion of the lid 30 forms the vapor passage portion 40 in the package 10. The state of the package 10 transitions from a closed state to a vapor passage state.

[0060] The vapor passage portion 40 includes a peelable portion 30A, a peelable surface 230A, and a passage 41. The peelable portion 30A is a portion of the lid 30 that is peeled from the sealing surface 230. The peelable surface 230A is a portion of the sealing surface 230 that faces the peelable portion 30A. The passage 41 is a space formed between the peelable portion 30A and the peelable surface 230A. The passage 41 connects the inside of the package 10 to the outside of the package 10.

[0061] When the packaging body 10 is in a steam-passing state and the pressure inside the packaging body 10 is higher than the pressure outside the packaging body 10, steam flows from the placement space 101 to the outside of the packaging body 10. The flow of steam to the outside of the packaging body 10 slows down the rate of increase in the pressure inside the packaging body 10, or the pressure inside the packaging body 10 decreases.

[0062] Refer to Figure 2. The flange 200 includes a plurality of preferred portions P. The preferred portions P of the flange 200 are portions where the vapor passage portion 40 is more likely to form than the non-preferential portions of a container configured so that the flange includes non-preferential portions. In the example shown, the flange 200 includes a plurality of preferred portions P and a plurality of non-preferential portions Q. The container 20 corresponds to an example of a "container configured so that the flange includes non-preferential portions." The middle portion 213 of the side 210 corresponds to the portion of the flange 200 that includes the non-preferential portion Q.

[0063] The priority portion P of the flange 200 is a portion where the vapor passage portion 40 is more likely to be formed than the non-priority portion Q of the flange 200. This is because the priority portion P has a shape where stress is more likely to be concentrated than the non-priority portion Q when the pressure inside the packaging body 10 increases.

[0064] In one example, the types of priority portions P are classified into first-type priority portions PA and second-type priority portions PB. The first-type priority portions PA are priority portions P provided with ribs 310. The second-type priority portions PB are priority portions P not provided with ribs 310.

[0065] The multiple priority portions P include at least two first-type priority portions PA and at least one second-type priority portion PB. The total number of the multiple priority portions P is defined as N, where N is an integer greater than or equal to 3. The number of first-type priority portions PA included in the multiple priority portions P is defined as NA, where NA is an integer greater than or equal to 2. The number of second-type priority portions PB included in the multiple priority portions P is defined as NB, where NB is an integer greater than or equal to 1.

[0066] The total number N of the multiple priority portions P is determined, for example, according to the shape of the flange 200. The shape of the flange 200 can be selected arbitrarily as long as it satisfies "N≧3." The shape of the flange 200 can be selected, for example, from a ring corresponding to a polygonal body 100, a ring corresponding to an elliptical body 100, or a ring corresponding to a body 100 of another shape. A circle is an example of an ellipse.

[0067] If the flange 200 is shaped like a ring corresponding to the polygonal body 100, N is equal to the number of angles provided on the flange 200. If the flange 200 is shaped like a ring corresponding to the elliptical body 100 rather than a circle, N is, for example, 4. If the flange 200 is shaped like a ring corresponding to the circular body 100, the entire flange 200 can be considered as a set of multiple priority portions P. The number N can be determined arbitrarily.

[0068] In the illustrated example, the shape of the flange 200 is a ring corresponding to the rectangular main body 100. The nodes 220 correspond to the corners of the flange 200. The nodes 220 correspond to the portions of the flange 200 that include the priority portions P. The number of corners provided on the flange 200 is four. The total number N of the multiple priority portions P is four. The number NA of the first type priority portions PA included in the multiple priority portions P is three. The number NB of the second type priority portions PB included in the multiple priority portions P is one.

[0069] The ribs 310 are provided in a portion of the flange 200 that includes the first-type priority portion PA. The ribs 310 protrude toward the sealing surface 230 of the flange 200. The ribs 310 are not provided in a portion of the flange 200 that includes the second-type priority portion PB. The ribs 310 are not provided in a portion of the flange 200 that includes the non-priority portion Q.

[0070] The first section 221 corresponds to a portion of the flange 200 that includes the first-type priority portion PA. The second section 222 corresponds to a portion of the flange 200 that includes the first-type priority portion PA. The third section 223 corresponds to a portion of the flange 200 that includes the first-type priority portion PA. The fourth section 224 corresponds to a portion of the flange 200 that includes the second-type priority portion PB.

[0071] The intermediate portion 213 of the first side 210A corresponds to the portion of the flange 200 that includes the non-priority portion Q. The intermediate portion 213 of the second side 210B corresponds to the portion of the flange 200 that includes the non-priority portion Q. The intermediate portion 213 of the third side 210C corresponds to the portion of the flange 200 that includes the non-priority portion Q. The intermediate portion 213 of the fourth side 210D corresponds to the portion of the flange 200 that includes the non-priority portion Q.

[0072] Please refer to Fig. 7. The rib 310 is configured to follow the shape of the flange 200. The relationship between the first rib 310A and the second rib 310B is line symmetrical about the X axis. The relationship between the first rib 310A and the third rib 310C is line symmetrical about the Y axis. In Fig. 7, the first rib 310A is shown as a representative of the first rib 310A to the third rib 310C.

[0073] The rib 310 includes a first end 311, a second end 312, and an intermediate portion 313. The first end 311 is located on one of the two sides 210 that meet at the node 220. The second end 312 is located on the other of the two sides 210 that meet at the node 220. The intermediate portion 313 is located on both of the two sides 210 that meet at the node 220.

[0074] The range of rib 310 in its extension direction ranges from first tip 311A ​​of rib 310 to second tip 312A of rib 310. First end 311 includes first tip 311A ​​of rib 310. First tip 311A ​​is located on one of two sides 210 that join at node 220. Second end 312 includes second tip 312A of rib 310. Second tip 312A is located on the other of two sides 210 that join at node 220.

[0075] Please refer to Figure 8. Figure 8 shows a cross section (hereinafter referred to as "first cross section") of the flange 200 and the rib 310 parallel to the height direction and radial direction of the package 10. A line segment parallel to the Z direction in the first cross section is referred to as "reference line LZ."

[0076] The height of the rib 310 is determined, for example, based on the seal surface 230 located at the base of the rib 310. The height of the rib 310 at the seal surface 230 is 0. The height of the rib 310 increases as it advances in the Z1 direction relative to the seal surface 230.

[0077] In the first cross section, the surface of the flange 200 is indicated by line segments LF11, LF12, and LF13. Line segment LF11 indicates a sealing surface 230, which is the surface of the inner peripheral portion 201 of the flange 200. Line segment LF12 indicates the sealing surface 230, which is the surface of the outer peripheral portion 202 of the flange 200. Line segment LF13 indicates the surface of the side portion 240 of the flange 200.

[0078] The rib 310 includes an apex 321, an inner portion 322, and an outer portion 323. In the first cross section, the surfaces of the rib 310 are indicated by line segments LR11 and LR12. The line segment LR11 indicates a portion of the surface of the apex 321 and the surface of the inner portion 322. The line segment LR11 is parallel to the Z direction. The line segment LR12 indicates a portion of the surface of the apex 321 and the surface of the outer portion 323. The line segment LR12 is inclined with respect to the Z direction.

[0079] Apex 321 is a mountain-shaped apex including corners. Apex 321 includes apex tip 321A. Apex tip 321A corresponds to the tip of the mountain-shaped apex 321. Apex tip 321A is the highest part of rib 310 shown in the first cross section. The surface of apex 321 is indicated by part of line segment LR11 and part of line segment LR12. Apex tip 321A corresponds to the intersection of line segment LR11 and line segment LR12.

[0080] The inner portion 322 is located between the top portion 321 and the inner periphery 201 of the flange 200. The inner portion 322 includes an inner tip 322A. The inner tip 322A is located at the boundary between the inner portion 322 and the sealing surface 230 of the inner periphery 201. The surface of the inner portion 322 is indicated by a portion of the line segment LR11. The inner portion 322 is parallel to the Z direction.

[0081] The angle indicating the inclination of the inner portion 322 with respect to the Z direction is referred to as the "inner angle TA." The inner angle TA is, for example, the angle between the reference line LZ passing through the inner tip 322A and the line segment LR11. When the line segment LR11 overlaps with the reference line LZ, the inner angle TA is 0°. In the illustrated example, the inner angle TA is 0°.

[0082] The outer portion 323 is located between the top 321 and the outer periphery 202 of the flange 200. The outer portion 323 includes an outer tip 323A. The outer tip 323A is located at the boundary between the outer portion 323 and the sealing surface 230 of the outer periphery 202. The surface of the outer portion 323 is indicated by a portion of the line segment LR12. The outer portion 323 is inclined with respect to the Z direction. The outer portion 323 is inclined so that the top 321 approaches the center of the container 20. The height of the rib 310 decreases as it progresses from the top 321 to the outer tip 323A.

[0083] The angle indicating the inclination of the outer portion 323 with respect to the Z direction is referred to as the "outer angle TB." The outer angle TB is, for example, the angle between a reference line LZ passing through the outer tip 323A and a line segment LR12. When the line segment LR12 overlaps with the reference line LZ, the outer angle TB is 0°. In the illustrated example, the outer angle TB is in the range greater than 0° and less than 90°.

[0084] In one example, the width of the rib 310 is indicated by the distance between the inner tip 322A and the outer tip 323A in the first cross section. The width of the first end 311 will be illustrated. In the first example, the width of the first end 311 varies in the extension direction of the rib 310. In the second example, the width of the first end 311 is constant in the extension direction of the rib 310. The width of the second end 312 will be illustrated. In the first example, the width of the second end 312 varies in the extension direction of the rib 310. In the second example, the width of the second end 312 is constant in the extension direction of the rib 310. The width of the intermediate portion 313 will be illustrated. In the first example, the width of the intermediate portion 313 is constant in the extension direction of the rib 310. In the second example, the width of the intermediate portion 313 varies in the extension direction of the rib 310.

[0085] Referring to Figure 7, the apex tip 321A of the first end 311 is parallel to the center line of the intermediate portion 213 of the flange 200. The outer tip 323A of the first end 311 is inclined relative to the center line of the intermediate portion 213 of the flange 200. The apex tip 321A of the second end 312 is parallel to the center line of the intermediate portion 213 of the flange 200. The outer tip 323A of the second end 312 is inclined relative to the center line of the intermediate portion 213 of the flange 200. The apex tip 321A of the intermediate portion 313 includes a circular arc portion and a straight portion. The outer tip 323A of the intermediate portion 313 includes a circular arc portion and a straight portion.

[0086] The width of the first end 311 narrows from the middle portion 313 toward the first tip 311A ​​in the extension direction of the rib 310. The width of the second end 312 narrows from the middle portion 313 toward the second tip 312A in the extension direction of the rib 310. The width of the middle portion 313 is approximately constant in the extension direction of the rib 310.

[0087] Please refer to Fig. 9. Fig. 9 shows a cross section of the flange 200 and the rib 310 parallel to the height direction and along the extension direction of the rib 310 (hereinafter referred to as "second cross section"). In the second cross section, the surface of the flange 200 is indicated by line segments LF21 and LF22. Line segment LF21 indicates the sealing surface 230, which is the surface of the intermediate portion 213 of one of the two sides 210 that are joined at the node 220. Line segment LF22 indicates the sealing surface 230, which is the surface of the intermediate portion 213 of the other of the two sides 210 that are joined at the node 220. In the second cross section, the surface of the rib 310 is indicated by line segments LR21, LR22, and LR23. Line segment LR21 indicates the surface of the first end portion 311. Line segment LR22 indicates the surface of the second end portion 312. Line segment LR23 indicates the surface of the intermediate portion 313.

[0088] The height of the intermediate portion 313 is constant. The height of the first end portion 311 decreases from the intermediate portion 313 toward the first tip 311A. The height of the second end portion 312 decreases from the intermediate portion 313 toward the second tip 312A.

[0089] See Figures 5 and 6. The packaging body 10 is used, for example, as follows: The packaging body 10 in a closed state is set in a heating means. An example of the heating means is a microwave oven. When the packaging body 10 in a closed state is heated, a vapor passage portion 40 is formed in one of the multiple nodes 220 of the flange 200, including the priority portion P. The state of the packaging body 10 transitions from the closed state to a vapor passage state. Examples of the vapor passage states of the packaging body 10 include a first vapor passage state and a second vapor passage state.

[0090] In the first steam-passing state of the packaging body 10, for example, the following situation can be observed. No steam-passing sections 40 are formed in the multiple nodes 220 including the first-type priority sections PA. Steam-passing sections 40 are formed in the nodes 220 including the second-type priority sections PB. Steam inside the packaging body 10 flows to the outside of the packaging body 10 through the steam-passing sections 40 formed in the nodes 220 including the second-type priority sections PB.

[0091] In the second steam-passing state of the packaging body 10, for example, the following situation can be observed. A steam-passing section 40 is formed in one of the multiple nodes 220 that include the first-type priority section PA. No steam-passing section 40 is formed in the other two of the multiple nodes 220 that include the first-type priority section PA. No steam-passing section 40 is formed in the node 220 that includes the second-type priority section PB. Steam inside the packaging body 10 flows to the outside of the packaging body 10 through the steam-passing section 40 formed in the node 220 that includes the first-type priority section PA.

[0092] After heating of the package 10 is completed, the package 10 is removed from the heating means. Of the nodes 220 including the first-type priority portion PA, a portion of the lid 30 corresponding to the node 220 where the vapor passage portion 40 is not formed is selected as the portion where the lid 30 begins to be peeled off. This is mainly because the node 220 where the vapor passage portion 40 is formed is hotter than the nodes 220 other than that node 220. The lid 30 is peeled off from the container 20. The state of the package 10 transitions from the vapor passage state to the open state. The contents 11 are removed from the container 20.

[0093] (effect) The effects obtained by the packaging body 10 and the container 20 will now be illustrated.

[0094] In one example of the package 10, the flange 200 includes a plurality of priority portions P. The above-described configuration of the packaging body 10 provides the following effects, for example. When the packaging body 10 in a closed state is heated, a vapor passage portion 40 is formed in one of the multiple nodes 220 of the flange 200, including the priority portion P. In the packaging body 10, the lid 30 and the flange 200 are the portions where the vapor passage portion 40 is intended to be formed. Compared to conventional packaging bodies, the packaging body 10 including the container 20 is less likely to have holes formed in the lid 30, which is the portion where the vapor passage portion 40 is intended to be formed.

[0095] In one example of the packaging body 10, the container 20 includes a protruding structure 300. The protruding structure 300 includes a plurality of ribs 310 protruding toward the sealing surface 230. The plurality of ribs 310 are provided at a node 220 of the flange 200 that includes the first-type priority portion PA. The plurality of ribs 310 are not provided at a node 220 of the flange 200 that includes the second-type priority portion PB.

[0096] The above-described configuration of the packaging body 10 provides the following advantages, for example: Because the flange 200 is provided with the rib 310, the rib 310 can be used as a marker for indicating where to start peeling off the lid 30. The convenience of the packaging body 10 is improved. Because the flange 200 is provided with multiple ribs 310, when a vapor passage portion 40 is formed at a node 220 corresponding to one of the multiple ribs 310, the other ribs 310 can be used as a marker for where to start peeling off the lid 30. Because the flange 200 is provided with the rib 310 at the node 220, the rib 310 can be used as a marker for when to start peeling off the lid 30 from the portion of the lid 30 that corresponds to the node 220.

[0097] In one example of the packaging body 10, the number of second-type priority portions PB included in the plurality of priority portions P is one. The above-described configuration of the packaging body 10 provides the following advantages, for example: The number of ribs 310 that can be used as markers for indicating where to start peeling off the lid 30 is increased; The convenience of the packaging body 10 is improved.

[0098] In one example of the package 10, the height of the first end 311 of the rib 310 decreases as it approaches the first tip 311A. The above-described configuration of the packaging body 10 provides the following advantages, for example: The lid 30 is strongly adhered to the sealing surface 230 around the first end 311. When the packaging body 10 is closed, the contents 11 are less likely to leak from the inside of the packaging body 10 to the outside of the packaging body 10.

[0099] In one example of the package 10, the height of the second end 312 of the rib 310 decreases as it approaches the second tip 312A. The above-described configuration of the packaging body 10 provides the following advantages, for example: The lid 30 is strongly adhered to the sealing surface 230 around the second end 312. When the packaging body 10 is closed, the contents 11 are less likely to leak from the inside of the packaging body 10 to the outside of the packaging body 10.

[0100] In one example of the package 10 , the height of the rib 310 decreases from the top 321 of the rib 310 towards the outer periphery 202 of the flange 200 . The above-described configuration of the packaging body 10 provides the following advantages, for example: When peeling the lid 30 from a portion of the lid 30 corresponding to the joint 220 including the first-type priority portion PA, the lid 30 is more likely to peel from the flange 200; The lid 30 is less likely to tear; and Fuzz is less likely to form on the sealing surface 230 from which the lid 30 has been peeled.

[0101] (Second embodiment) The packaging body 10 of the second embodiment is configured based on the packaging body 10 of the first embodiment. The configuration of the packaging body 10 of the second embodiment differs from the configuration of the packaging body 10 of the underlying embodiment mainly in the following points.

[0102] Please refer to Figure 10. Figure 10 shows a first cross section of the container 20 of the second embodiment. The inner portion 322 is inclined with respect to the Z direction. In the second cross section, the line segment LR11 showing the surface of the inner portion 322 is inclined with respect to the Z direction. The inner portion 322 is inclined so that the apex 321 moves away from the center of the container 20. The height of the rib 310 decreases from the apex 321 to the inner tip 322A. The inner angle TA is in the range greater than 0° and less than 90°. The outer angle TB is in the range greater than 0° and less than 90°. The inner angle TA is smaller than the outer angle TB.

[0103] (Third embodiment) The packaging body 10 of the third embodiment is configured based on the packaging body 10 of the first embodiment. The configuration of the packaging body 10 of the third embodiment differs from the configuration of the packaging body 10 of the underlying embodiment mainly in the following points.

[0104] Please refer to Fig. 11. Fig. 11 shows a first cross section of the container 20 of the third embodiment. In the first cross section, the surface of the rib 310 is indicated by line segment LR11, line segment LR12, and curved line LR13. The curved line LR13 indicates the surface of the apex 321. The curved line LR13 is a circular arc. The center of the circular arc is defined between the line segment LR11 and the line segment LR12. The apex 321 is a mountain shape including a curved surface.

[0105] (Fourth embodiment) The packaging body 10 of the fourth embodiment is configured based on the packaging body 10 of the second embodiment. The configuration of the packaging body 10 of the fourth embodiment differs from the configuration of the packaging body 10 of the underlying embodiment mainly in the following points.

[0106] Please refer to Figure 12. Figure 12 shows a first cross section of the container 20 of the fourth embodiment. In the first cross section, the surface of the rib 310 is indicated by line segment LR11, line segment LR12, and curve LR13. The curve LR13 indicates the surface of the apex 321. The curve LR13 is a circular arc. The center of the circular arc is defined between line segment LR11 and line segment LR12. The apex 321 is a mountain shape including a curved surface.

[0107] (Fifth embodiment) The packaging body 10 of the fifth embodiment is configured based on the packaging body 10 of the first embodiment. The configuration of the packaging body 10 of the fifth embodiment differs from the configuration of the packaging body 10 of the underlying embodiment mainly in the following points.

[0108] Please refer to Figure 13. Figure 13 shows a first cross section of the container 20 of the fifth embodiment. In the first cross section, the surface of the rib 310 is indicated by line segments LR11, LR12, and LR14. Line segment LR14 indicates the surface of the apex 321. Line segment LR14 is parallel to the radial direction. The apex 321 is a plane. The apex tip 321A is included in the plane of the apex 321. The inner angle TA is 0°. The outer angle TB is 0°.

[0109] (Sixth embodiment) The packaging body 10 of the sixth embodiment is configured based on the packaging body 10 of the first embodiment. The configuration of the packaging body 10 of the sixth embodiment differs from the configuration of the packaging body 10 of the underlying embodiment mainly in the following points.

[0110] Please refer to Figure 14. Figure 14 shows a plan view of the node 220 of the container 20 of the sixth embodiment. The apex tip 321A of the first end 311 is inclined relative to the center line of the intermediate portion 213 of the flange 200. The apex tip 321A of the first end 311 is inclined away from the inner circumferential edge 201A as it progresses from the intermediate portion 313 toward the first tip 311A. The apex tip 321A of the second end 312 is inclined relative to the center line of the intermediate portion 213 of the flange 200. The apex tip 321A of the second end 312 is inclined away from the inner circumferential edge 201A as it progresses from the intermediate portion 313 toward the second tip 312A.

[0111] Seventh embodiment The packaging body 10 of the seventh embodiment is configured based on the packaging body 10 of any of the first to sixth embodiments. In the seventh embodiment, various configurations regarding the sides 210 and the protruding structures 300 of the packaging body 10 are presented.

[0112] The lengths of the sides 210 can be selected arbitrarily. In a first example, the lengths of the first side 210A to the fourth side 210D are equal. In a second example, the lengths of three of the first side 210A to the fourth side 210D are equal. In a third example, the lengths of two of the first side 210A to the fourth side 210D are equal. In a fourth example, the first side 210A to the fourth side 210D include two sets. The lengths of the sides 210 included in the first set are equal. The lengths of the sides 210 included in the second set are equal but different from the lengths of the sides 210 included in the first set. In a fifth example, the lengths of the first side 210A to the fourth side 210D are different.

[0113] The shape of the sides 210 can be selected arbitrarily. In a first example, the shape of at least one of the first sides 210A to the fourth sides 210D includes a curved portion. In a second example, the first sides 210A to the fourth sides 210D include two sets. The sides 210 included in the first set have the same shape. The sides 210 included in the first set face each other in the X direction, face each other in the Y direction, or are connected at a node 220. The sides 210 included in the second set have the same shape. The shapes of the sides 210 included in the second set are different from the shapes of the sides 210 included in the first set. The sides 210 included in the second set face each other in the X direction, face each other in the Y direction, or are connected at a node 220.

[0114] The shape of the multiple ribs 310 included in the protruding structure 300 can be selected arbitrarily. In a first example, the multiple ribs 310 have the same shape. In a second example, the multiple ribs 310 are classified into two or more groups according to their shapes. The ribs 310 included in the same group have the same shape. The shapes of the ribs 310 between different groups are different. The shape of the ribs 310 in each group can be selected from, for example, any of the above-mentioned embodiments.

[0115] (Eighth embodiment) The packaging body 10 of the eighth embodiment is configured based on the packaging body 10 of any of the first to seventh embodiments. The configuration of the packaging body 10 of the eighth embodiment differs from the configuration of the packaging body 10 of the underlying embodiment mainly in the following points.

[0116] Please refer to Figure 15. Figure 15 shows a plan view of the container 20. The shape of the main body 100 is oval. The shape of the flange 200 is a ring corresponding to the shape of the main body 100. The flange 200 can be divided into any number of sides 210. In one example, the flange 200 can be divided into four sides 210. The four sides 210 include a first side 210A to a fourth side 210D. The first side 210A and the second side 210B are shaped like straight lines. The third side 210C and the fourth side 210D are shaped like circular arcs. The first side 210A and the second side 210B are equal in length. The third side 210C and the fourth side 210D are equal in length.

[0117] The flange 200 includes a plurality of sections 220. The plurality of sections 220 includes a first section 221, a second section 222, a third section 223, and a fourth section 224. The sections 220 correspond to the portions of the flange 200 that include the priority portions P. The configuration of the sections 220 conforms to the configuration of the sections 220 in the underlying embodiment. The total number N of the plurality of priority portions P is 4. The number NA of first type priority portions PA included in the plurality of priority portions P is 3. The number NB of second type priority portions PB included in the plurality of priority portions P is 1.

[0118] The first section 221 corresponds to a portion of the flange 200 that includes the first-type priority portion PA. The second section 222 corresponds to a portion of the flange 200 that includes the first-type priority portion PA. The third section 223 corresponds to a portion of the flange 200 that includes the first-type priority portion PA. The fourth section 224 corresponds to a portion of the flange 200 that includes the second-type priority portion PB.

[0119] The rib 310 is configured to follow the shape of the flange 200. The first end 311, second end 312, and middle portion 313 of the rib 310 are located on the arc side 210 of the straight side 210 and the arc side 210 that are connected at the node 220. The shapes of the first end 311, second end 312, and middle portion 313 are arcs. The shape of the rib 310 in the first cross section conforms to the shape of the rib 310 in the underlying embodiment. The shape of the rib 310 in the second cross section conforms to the shape of the rib 310 in the underlying embodiment.

[0120] (Ninth embodiment) The packaging body 10 of the ninth embodiment is configured based on the packaging body 10 of any of the first to seventh embodiments. The configuration of the packaging body 10 of the ninth embodiment differs from the configuration of the packaging body 10 of the underlying embodiment mainly in the following points.

[0121] Refer to Figure 16. Figure 16 shows a plan view of the container 20. The shape of the main body 100 is circular. The shape of the flange 200 is a ring corresponding to the shape of the main body 100. The container 20 of the ninth embodiment does not correspond to a "container configured so that the flange includes a non-priority portion." The container 20 of the first embodiment corresponds to an example of a "container configured so that the flange includes a non-priority portion." The priority portion P of the container 20 of the ninth embodiment is a portion where the vapor-passing portion 40 is more likely to be formed than, for example, the non-priority portion Q of the container 20 of the first embodiment. The ease of forming the vapor-passing portion 40 can be evaluated, for example, by the time from when heating of the package 10 begins until the vapor-passing portion 40 is formed.

[0122] The flange 200 can be divided into any number of sides 210. In one example, the flange 200 can be divided into four sides 210. The four sides 210 include a first side 210A to a fourth side 210D. The first side 210A to the fourth side 210D are arcs of equal length. The first side 210A to the fourth side 210D correspond to the portion of the flange 200 that includes the priority portion P.

[0123] The flange 200 includes a plurality of sections 220. The plurality of sections 220 includes a first section 221, a second section 222, a third section 223, and a fourth section 224. The sections 220 correspond to the portion of the flange 200 that includes the priority section P. The configuration of the sections 220 conforms to the configuration of the sections 220 in the underlying embodiment. The total number N of the plurality of priority sections P is set to, for example, 4 according to the number of sections 220. The number NA of first type priority sections PA included in the plurality of priority sections P is 3. The number NB of second type priority sections PB included in the plurality of priority sections P is 1.

[0124] The first section 221 corresponds to a portion of the flange 200 that includes the first-type priority portion PA. The second section 222 corresponds to a portion of the flange 200 that includes the first-type priority portion PA. The third section 223 corresponds to a portion of the flange 200 that includes the first-type priority portion PA. The fourth section 224 corresponds to a portion of the flange 200 that includes the second-type priority portion PB.

[0125] The rib 310 is configured to follow the shape of the flange 200. The first end 311 is located on one of the two sides 210 that connect at the node 220. The shape of the first end 311 is an arc. The second end 312 is located on the other of the two sides 210 that connect at the node 220. The shape of the second end 312 is an arc. The middle portion 313 is located on both of the two sides 210 that connect at the node 220. The shape of the middle portion 313 is an arc. The shape of the rib 310 in the first cross section is similar to the shape of the rib 310 in the underlying embodiment. The shape of the rib 310 in the second cross section is similar to the shape of the rib 310 in the underlying embodiment.

[0126] (Tenth embodiment) The packaging body 10 of the tenth embodiment is configured based on the packaging body 10 of any of the first to ninth embodiments. The configuration of the packaging body 10 of the tenth embodiment differs from the configuration of the packaging body 10 of the underlying embodiment mainly in the following points.

[0127] The rib 310 may have, for example, a first gradient structure or a second gradient structure relating to the gradient of the rib 310. The first gradient structure is a structure in which a gradient is provided on at least a portion of the rib 310. The second gradient structure is a structure in which no gradient is provided on the rib 310. The rib 310 of the present embodiment has the first gradient structure.

[0128] In one example, the first gradient structure includes at least one of a gradient provided at the first end 311, a gradient provided at the second end 312, a gradient provided at the inner portion 322, and a gradient provided at the outer portion 323.

[0129] (Eleventh embodiment) The packaging body 10 of the eleventh embodiment is configured based on the packaging body 10 of any one of the first to tenth embodiments. The packaging body 10 includes a first height structure related to the height of the rib 310. In the first height structure, the height of the rib 310 is in the range of 0.1 mm or more. For example, the maximum height of the top end 321A is selected as the height of the rib 310.

[0130] When the packaging body 10 includes the first height structure, for example, the following effects can be obtained. With the lid 30 adhered to the flange 200, the rib 310 becomes easily perceptible when touching the lid 30 with the hand.

[0131] When the packaging body 10 includes the first gradient structure and the first height structure, for example, the following effects can be obtained. The sealing strength of the joint 220 including the first-type priority portion PA of the flange 200 is higher than the sealing strength of the joint 220 including the second-type priority portion PB of the flange 200. When the package 10 in the closed state is heated, the vapor passage portion 40 is more likely to be formed in the joint 220 including the second-type priority portion PB of the flange 200 than in the joint 220 including the first-type priority portion PA of the flange 200. Stability regarding the position in the package 10 where the vapor passage portion 40 is formed is increased.

[0132] When the packaging body 10 includes the first gradient structure and the first height structure, and the number NB of second-type priority portions PB included in the plurality of priority portions P is 1, for example, the following effects can be obtained. The portion of the flange 200 where the vapor passage portion 40 is formed is specified to be one joint 220 including the second-type priority portion PB. The convenience of the package 10 is improved.

[0133] (Twelfth embodiment) The packaging body 10 of the twelfth embodiment is configured based on the packaging body 10 of any one of the first to tenth embodiments. The packaging body 10 includes a second height structure related to the height of the rib 310. In the second height structure, the height of the rib 310 is within a range of 0.2 mm or more. For example, the maximum height of the top end 321A is selected as the height of the rib 310.

[0134] When the packaging body 10 includes the second height structure, the following effects can be obtained, for example. With the lid 30 adhered to the flange 200, the rib 310 becomes easily perceptible when touching the lid 30 with the hand.

[0135] The seal strength of the joint 220 including the first-type priority portion PA of the flange 200 is higher than the seal strength of the joint 220 including the second-type priority portion PB of the flange 200. The difference between the seal strength of the joint 220 including the first-type priority portion PA and the seal strength of the joint 220 including the second-type priority portion PB is greater than when the package 10 includes the first gradient structure and the first height structure. When the package 10 in the closed state is heated, the vapor passage portion 40 is more likely to be formed in the joint 220 including the second-type priority portion PB of the flange 200 than in the joint 220 including the first-type priority portion PA of the flange 200. Stability regarding the position where the vapor passage portion 40 is formed in the package 10 is increased.

[0136] When the packaging body 10 includes the second height structure and the number NB of second-type priority portions PB included in the plurality of priority portions P is 1, for example, the following effects can be obtained. The portion of the flange 200 where the vapor passage portion 40 is formed is specified to be one joint 220 including the second-type priority portion PB. The convenience of the package 10 is improved.

[0137] (Thirteenth embodiment) The packaging body 10 of the thirteenth embodiment is configured based on the packaging body 10 of any one of the first to tenth embodiments. The packaging body 10 includes a third height structure related to the height of the rib 310. In the third height structure, the height of the rib 310 is within a range of 0.4 mm or more. For example, the maximum height of the top end 321A is selected as the height of the rib 310.

[0138] When the packaging body 10 includes the third height structure, for example, the following effects can be obtained. With the lid 30 adhered to the flange 200, the rib 310 becomes easily perceptible when touching the lid 30 with the hand.

[0139] The seal strength of the joint 220 including the first-type priority portion PA of the flange 200 is higher than the seal strength of the joint 220 including the second-type priority portion PB of the flange 200. The difference between the seal strength of the joint 220 including the first-type priority portion PA and the seal strength of the joint 220 including the second-type priority portion PB is greater than when the package 10 includes the first gradient structure and the first height structure. When the package 10 in the closed state is heated, the vapor passage portion 40 is more likely to be formed in the joint 220 including the second-type priority portion PB of the flange 200 than in the joint 220 including the first-type priority portion PA of the flange 200. The position where the vapor passage portion 40 is formed in the package 10 is more stable. In the joint 220 including the first-type priority portion PA of the flange 200, the lid 30 is less likely to peel off when the package 10 is heated.

[0140] When the packaging body 10 includes the third height structure and the number NB of second-type priority portions PB included in the plurality of priority portions P is 1, for example, the following effects can be obtained. The portion of the flange 200 where the vapor passage portion 40 is formed is specified to be one joint 220 including the second-type priority portion PB. The convenience of the package 10 is improved.

[0141] (Fourteenth embodiment) The packaging body 10 of the fourteenth embodiment is configured based on the packaging body 10 of any one of the first to thirteenth embodiments. The packaging body 10 includes a fourth height structure related to the height of the rib 310. In the fourth height structure, the height of the rib 310 is within a range of 1.5 mm or less. The height of the rib 310 is selected to be, for example, the maximum height of the top end 321A.

[0142] When the packaging body 10 includes a first gradient structure and a fourth height structure, and the first gradient structure includes a gradient at the first end 311 and a gradient at the second end 312 of the rib 310, for example, the following effects can be obtained. The lid 30 is strongly adhered to the sealing surface 230 around the first end 311 and the sealing surface 230 around the second end 312. When the package 10 is in a closed state, the contents 11 are less likely to leak from the inside of the package 10 to the outside of the package 10.

[0143] When the packaging body 10 includes the first gradient structure and the fourth height structure, and the first gradient structure includes a gradient of the outer portion 323 of the rib 310, for example, the following effects can be obtained. When peeling off the lid 30 from a part of the lid 30 corresponding to the joint 220 including the first-type priority portion PA, the lid 30 is easily peeled off from the flange 200. The lid 30 is less likely to be torn. Fluffing is less likely to form on the sealing surface 230 from which the lid 30 has been peeled off.

[0144] (Fifteenth embodiment) The packaging body 10 of the fifteenth embodiment is configured based on the packaging body 10 of any one of the first to thirteenth embodiments. The packaging body 10 includes a fifth height structure related to the height of the rib 310. In the fifth height structure, the height of the rib 310 is within a range of 0.1 mm or less. The height of the rib 310 is selected to be, for example, the maximum height of the top end 321A.

[0145] When the packaging body 10 includes the fifth height structure, for example, the following effects can be obtained. The lid 30 is firmly adhered to the sealing surface 230 around the rib 310. When the package 10 is in the closed state, the contents 11 are less likely to leak from the inside of the package 10 to the outside of the package 10.

[0146] (Example) Please refer to Fig. 17. Fig. 17 shows an example of the results of a measurement test for measuring the characteristics of the package 10. The measurement items in the measurement test are the following first to fifth measurement items.

[0147] The first measurement item is an item related to the sealing property of the package 10 in a closed state. The phenomenon in which the contents 11 leak from the package 10 in a closed state is called a "leak." The "leak check" column in the figure corresponds to the first measurement item. The second measurement item is an item related to the seal strength of the joint 220 in the closed state. The column "Seal Strength" in the drawing corresponds to the second measurement item. The third item is an item related to the position where the vapor passage portion 40 is formed in the heated package 10. The column "Vapor passage portion check" in the drawing corresponds to the third measurement item. The fourth item is an item relating to the state of the flange 200 and the lid 30 when the lid 30 is opened. The column "Opening test" in the drawing corresponds to the fourth measurement item. The fifth item relates to the state of the lid 30 when the closed package 10 is dropped. The column "Drop test" in the drawing corresponds to the fifth measurement item.

[0148] In the measurement test, a package 10 conforming to the configuration of the package 10 of the first embodiment was used as a sample. The material of the container 20 was PPF (filler-containing polypropylene). For example, the horizontal length of the container 20 was selected as the distance between the outer periphery 202A of the first side 210A of the flange 200 and the outer periphery 202A of the second side 210B of the flange 200. The horizontal length of the container 20 in the sample was 185 mm. For example, the vertical length of the container 20 was selected as the distance between the outer periphery 202A of the third side 210C of the flange 200 and the outer periphery 202A of the fourth side 210D of the flange 200. The vertical length of the container 20 in the sample was 185 mm. For example, the depth of the container 20 was selected as the distance between the plane including the sealing surface 230 of the flange 200 and the bottom 110 of the main body 100. The depth of the container 20 in the sample was 50 mm. As the width of flange 200, for example, the width of intermediate portion 213 of flange 200 is selected. The width of flange 200 in the sample is 6.5 mm. As the width of rib 310, for example, the width of intermediate portion 313 of rib 310 is selected. The width of rib 310 in the sample is 3 mm.

[0149] The outer layer of the lid 30 is a PET (polyethylene terephthalate) film. The middle layer of the lid 30 is a barrier nylon film. The inner layer of the lid 30 is an easy-peel film. An ink layer is provided between the outer layer and the middle layer. The outer layer, middle layer, and inner layer are bonded together by dry lamination. The ink layer and middle layer are bonded by a first adhesive layer. The middle layer and inner layer are bonded by a second adhesive layer. The thickness of the outer layer is 12 μm. The thickness of the middle layer is 15 μm. The thickness of the inner layer is 30 μm.

[0150] There are two factors related to the sample: the height of the rib 310 and whether or not the rib 310 is sloped. The "Rib Height" column in the drawing indicates the height of the rib 310. As the height of the rib 310, for example, the maximum height of the top end 321A is selected. "Rib gradient" in the figure indicates whether or not the rib 310 has a gradient. "None" in the "Rib gradient" column in the figure indicates that the rib 310 has no gradient. This corresponds to the case where the rib 310 includes a second gradient structure. "Yes" in the "Rib gradient" column in the figure indicates that the rib 310 has a gradient. Specifically, this corresponds to the case where the rib 310 includes a first gradient structure, and the first gradient structure includes a gradient provided at the first end 311, a gradient provided at the second end 312, a gradient provided at the inner portion 322, and a gradient provided at the outer portion 323.

[0151] A test related to the first measurement item is referred to as the "first measurement test." A test related to the second measurement item is referred to as the "second measurement test." A test related to the third measurement item is referred to as the "third measurement test." A test related to the fourth measurement item is referred to as the "fourth measurement test." A test related to the fifth measurement item is referred to as the "fifth measurement test."

[0152] There were seven levels for the height of the rib 310 in each measurement test. The seven levels were 0.1 mm, 0.2 mm, 0.4 mm, 0.7 mm, 1.2 mm, 1.5 mm, and 1.6 mm. There were two levels for the presence or absence of a slope of the rib 310 in each measurement test. The two levels were present and absent. For each measurement test, 14 types of samples based on a combination of two factors were used.

[0153] In the first measurement test, a sample manufactured under the following conditions was used. A penetrant was selected as the content 11. A certain amount of the penetrant was placed in the container 20. The lid 30 was attached to the container 20 by heat sealing. The following conditions were selected for the heat sealing: the heating temperature was 170°C, the pressure was 0.3 MPa, and the heating time was 1.5 seconds.

[0154] In the first measurement test, the closed package 10 was tilted so that the penetrant liquid reached the boundary between the flange 200 and the lid 30, and it was visually confirmed whether or not a leak occurred. In the "Leak Check" column in the figure, "No" indicates that the following condition was confirmed: No leak occurred in the closed package 10. In the "Leak Check" column in the figure, "Yes" indicates that the following condition was confirmed: A leak occurred in the closed package 10.

[0155] In the second measurement test, a sample manufactured under the following conditions was used: No content 11 was placed in the container 20. The lid 30 was attached to the container 20 by heat sealing. The following conditions were selected for heat sealing: the heating temperature was 170°C, the pressure was 0.3 MPa, and the heating time was 1.5 seconds.

[0156] In the second measurement test, the seal strength at each joint 220 was measured using a peel tester. The following conditions were selected for the peel test: The pulling speed of the lid 30 was 300 mm / min. The peel angle of the lid 30 was 90°.

[0157] In the third measurement test, a sample manufactured under the following conditions was used. A food product was selected as the content 11. Chilled pasta was selected as the food product. The weight of the content 11 was 200 g. The lid 30 was attached to the container 20 by heat sealing. The following conditions were selected for the heat sealing: the heating temperature was 170°C, the pressure was 0.3 MPa, and the heating time was 1.5 seconds.

[0158] In the third measurement test, the package 10 in a closed state was heated by a heating means. A microwave oven was selected as the heating means. The following conditions were selected for heating: the microwave oven output was 1600 W; and the heating time was 1 minute.

[0159] After heating of the package 10 was completed, the state of peeling of the lid 30 was visually confirmed. "A1" in the "Steam Passage Part Check" column in the figure indicates a case where the following conditions were confirmed: A steam passage part 40 is formed in the section 220 including the second-type priority part PB. The lid 30 has not peeled off in the section 220 including the first-type priority part PA. "A2" in the "Steam Passage Part Check" column in the figure indicates a case where the following conditions were confirmed: A steam passage part 40 is formed in the section 220 including the second-type priority part PB. The lid 30 has peeled off in at least one of the sections 220 including the first-type priority part PA. A steam passage part 40 has not been formed in all of the sections 220 including the first-type priority part PA. "A3" in the "Steam Passage Part Check" column in the figure indicates a case where the following conditions were confirmed: A steam passage part 40 is formed in at least one of the sections 220 including the first-type priority part PA.

[0160] In the fourth measurement test, a sample manufactured under the same conditions as in the third measurement test was used. The package 10 in an electrically closed state was heated under the same conditions as in the third measurement test. A sample in which a vapor passage portion 40 was formed in the section 220 including the second-type priority portion PB was used for the test.

[0161] In the fourth measurement test, the lid 30 of the package 10 after heating was peeled off by hand. The following conditions were selected as conditions for opening the lid 30. The location where peeling of the lid 30 began was the node 220 located diagonally opposite the node 220 including the second-type priority portion PB. There were two levels for the timing at which peeling of the lid 30 began. The two levels were immediately after heating of the package 10 was completed, and five minutes after heating of the package 10 was completed.

[0162] The condition of the lid 30 after peeling from the flange 200 and the condition of the sealing surface 230 after the lid 30 was peeled were visually confirmed. "B1" in the "Opening test" column in the figure indicates a case where the following conditions were confirmed: There are no torn parts in the lid 30 after peeling from the flange 200. There is no fuzz on the sealing surface 230 after the lid 30 was peeled. "B2" in the "Opening test" column in the figure indicates a case where the following conditions were confirmed: There are no torn parts in the lid 30 after peeling from the flange 200. There is fuzz on the sealing surface 230 after the lid 30 was peeled. "B3" in the "Opening test" column in the figure indicates a case where the following conditions were confirmed: There are torn parts in the lid 30 after peeling from the flange 200.

[0163] In the fifth measurement test, samples manufactured under the same conditions as in the third measurement test were used. Multiple packages 10 stacked in the vertical direction were set at an initial position a certain distance above the target surface and then dropped vertically from the initial position. The following conditions were selected for the dropping of the packages 10: The number of packages 10 stacked in the vertical direction was two. In the initial position, the bottom 110 of the container 20 of the package 10 was parallel to the target surface. In the initial position, the distance between the bottom 110 of the container 20 of the package 10 located lower and the target surface was 80 cm.

[0164] The presence or absence of tears in the lid 30 of the dropped package 10 was visually confirmed. "No" in the "Drop test" column in the figure indicates the case where the following condition was confirmed: There was no tear in the lid 30 of the dropped package 10. "Yes" in the "Drop test" column in the figure indicates the case where the following condition was confirmed: There was a tear in the dropped lid 30. As a result of conducting the fifth measurement test using a conventional package as a sample, it was confirmed that there was a tear in the bag.

[0165] The possible forms of the container and package of the present invention are not limited to those described in the above embodiments. The container and package of the present invention may have forms different from those exemplified in the embodiments. Examples of such forms include forms in which part of the configuration of each embodiment is replaced, modified, or omitted, or forms in which a new configuration is added to each embodiment. [Explanation of symbols]

[0166] 10: Packaging 11:Contents 100: Main body 20: Container 30: Lid 40: Steaming section 200: Flange 202: Outer periphery 210: Side 210A: First side 210B: Second side 210C: Third side 210D: Side 4 211: First end 212: Second end 220 :section 221 :Section 1 222: Section 2 223 :Section 3 224 :Section 4 230: Sealing surface 300:Protruding structure 310: Rib 310A: First rib 310B: Second rib 310C: 3rd rib P:Priority part PA: First class priority section PB: 2nd class priority section Q: Non-priority part

Claims

1. a main body in which contents are placed; a flange provided on the outer periphery of the body and including a sealing surface to which a lid is adhered; a protruding structure provided on the flange, the flange includes a plurality of preferred portions and a plurality of non-preferred portions; the protruding structure includes a plurality of ribs protruding toward the sealing surface; the preferred portion is a portion where a vapor passage portion through which vapor passes is more likely to be formed than the non-preferential portion, and is a portion having a shape where stress is more likely to be concentrated than the non-preferential portion when pressure inside the package in which the lid is bonded to the flange increases, the plurality of priority portions include at least two first-type priority portions and at least one second-type priority portion; the plurality of ribs are provided in a portion of the flange including the first-type priority portion, and are not provided in a portion of the flange including the second-type priority portion, The number of the second type priority portions included in the plurality of priority portions is 1. container.

2. a main body in which contents are placed; a flange provided on the outer periphery of the body and including a sealing surface to which a lid is adhered; a protruding structure provided on the flange, the flange includes a plurality of preferred portions and a plurality of non-preferred portions; the protruding structure includes a plurality of ribs protruding toward the sealing surface; the priority portion is a portion where a vapor passage portion through which steam passes is more likely to be formed than the non-priority portion, the plurality of priority portions include at least two first-type priority portions and at least one second-type priority portion; the plurality of ribs are provided in a portion of the flange including the first-type priority portion, and are not provided in a portion of the flange including the second-type priority portion, the flange includes a plurality of sides and a plurality of nodes; the plurality of sides include a first side, a second side, a third side, and a fourth side; the plurality of nodes include a first node, a second node, a third node, and a fourth node; the first node is a portion where a first end of the first side and a first end of the third side are connected, the second node is a portion where a second end of the first side and a first end of the fourth side are connected, the third node is a portion where a first end of the second side and a second end of the third side are connected, the fourth node is a portion where the second end of the second side and the second end of the fourth side are connected, the plurality of priority portions include three of the first type priority portions and one of the second type priority portions, the first to third sections are portions of the flange including the first type priority portion, the fourth section is a portion of the flange including the second type priority portion, the plurality of ribs include a first rib, a second rib, and a third rib; the first rib is provided at the first section, the second rib is provided at the second section, The third rib is provided at the third section. container.

3. The maximum height of the top tip of the rib selected as the height of the rib is in the range of 0.1 mm or more.

3. The container according to claim 1 or 2.

4. The maximum height of the top tip of the rib selected as the height of the rib is in the range of 0.2 mm or more.

4. The container of claim 3.

5. The maximum height of the top tip of the rib selected as the height of the rib is in the range of 1.5 mm or less. A container according to any one of claims 1 to 4.

6. The height of the end of the rib in the extension direction of the rib decreases as it approaches the tip of the rib. A container according to any one of claims 1 to 5.

7. The height of the rib decreases from the top of the rib toward the outer periphery of the flange. A container according to any one of claims 1 to 6.

8. A container according to any one of claims 1 to 7, a lid bonded to the flange. packaging.

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