JP2019177928A - container - Google Patents

Abstract

To provide a container capable of heating a content without opening and obtaining a stable heating efficiency improvement effect.SOLUTION: The container is composed of a laminate including at least a first layer and a second layer, and includes a first container body including a recessed part and a flange part formed along the periphery of the recessed part and extending outward from a peripheral edge and a second container body that forms an internal space with a recessed part by being joined to the second layer in a joining region formed in the flange part. A bonding strength between the second container body and the second layer is stronger than an interlayer bonding strength between the second layer and the first layer, a missing part of the second layer is formed in parallel and spaced apart on a recessed part side of the joining region, a projection part is formed in which the joining region projects toward the missing part in a part of a circumferential direction of the flange part, and a cut extending in a width direction of the flange part from the missing part toward the joining region on both sides of the projection part is formed in at least the second layer.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a container.

  In a container such as a food product composed of a container body and a lid, it is not easy to achieve both the sealing performance of the container and the unsealing property, that is, making the lid body easily peelable from the container body when opened. This is because if the bonding strength between the container body and the lid is increased, the sealing performance is improved, but the opening performance is lowered. Conversely, if the bonding strength is decreased, the sealing performance is decreased instead of improving the opening performance. . Various techniques for solving such problems have been proposed so far.

  For example, in Patent Document 1 and Patent Document 2, in a container composed of a container main body and a lid joined to a flange portion of the container main body, the interlayer adhesive force between the inner and outer layers of the container main body formed of a multilayer sheet is shown. There has been proposed a technique in which an inner layer on the container opening side of the flange portion is provided with a notch while being configured to be smaller than the adhesive force between the flange and the lid. It is possible to improve the opening property without weakening the bonding strength between the container body and the lid body by delaminating the container body in the junction area between the container body and the lid body formed outside the notch. .

  On the other hand, in Patent Document 3, as in the above example, in the container in which the annular cut portion is provided in the flange portion of the container body, the distance from the inner edge of the heat seal portion is a part of the annular cut portion. A technique is described in which a smaller portion is formed and the portion between the flange portion and the lid is separated at a lower pressure than other portions at this portion to make a steam outlet during heating. Accordingly, even when a packaging container filled with food or the like is heated in a microwave oven, it is possible to prevent the packaging container from bursting and causing the contents to scatter and burns.

Japanese Patent Laid-Open No. 62-251363 JP 63-78 Japanese Patent No. 4242873

  The container described in Patent Document 3 is sealed until the steam outlet is formed, and the internal pressure of the container is kept high after the steam outlet is formed. When heating contents such as food in a microwave oven, it is expected to improve heating efficiency by filling the container with water vapor. However, in the container described in Patent Document 3, the flange portion and the lid body are separated at a portion where the distance between the annular cut portion and the inner edge of the heat seal portion is smaller than the other portion, and the steam discharge port is When formed, the width of the steam discharge port is not constant because the flange portion and the lid body are irregularly separated even at the portions adjacent to both sides thereof. As a result, the effect of improving the heating efficiency obtained by filling the container with water vapor varies from container to container, and it is difficult to predict how much heating efficiency can be expected when setting the heating time using a microwave oven.

  Accordingly, an object of the present invention is to provide a new and improved container capable of obtaining a stable effect of improving heating efficiency in a container capable of heating contents without opening. I will.

According to an aspect of the present invention, a first container body including a flange including at least a first layer and a second layer and including a recess and a flange formed along the periphery of the recess and extending outward from the periphery. And a second container body that forms an internal space with the recess by being joined to the second layer in the joining region formed in the flange portion, the second container body and the second layer Is stronger than the interlayer bonding strength between the second layer and the first layer, and a missing portion of the second layer that is spaced apart and parallel to the concave portion side of the bonding region is formed. Protrusions in which the joining region protrudes toward the missing portion are formed in a part of the circumferential direction, and at least a notch extending in the width direction of the flange portion from the missing portion toward the joining region is formed on both sides of the projecting portion. A container is provided.
According to the above configuration, the portion between the container body and the lid body is peeled off at a lower pressure than the other portions at the portion including the protruding portion of the joining region. The container can be filled with water vapor to improve the heating efficiency of the contents while preventing the container from bursting. By forming notches extending in the width direction of the flange on both sides of the protrusion, the width of the internal space of the container communicating with the external space is stabilized in the steaming section, and stable heating efficiency with little variation between containers The improvement effect can be obtained.

According to another aspect of the present invention, the first container is formed of a laminate including at least a first layer and a second layer, and includes a recess and a flange portion formed along the periphery of the recess and extending outward from the periphery. A container comprising: a main body; and a second container main body that forms an internal space between the main body and the concave portion by being bonded to the second layer in a bonding region formed in the flange portion. The bonding strength between the layers is stronger than the interlayer bonding strength between the second layer and the first layer, and a missing portion of the second layer that is spaced apart and parallel to the concave portion side of the bonding region is formed, and the flange portion There is provided a container in which an additional missing portion of the second layer is formed in a part of the circumferential direction along the edge on the concave side of the joining region.
According to said structure, since the space | interval between a container main body and a cover body peels in a pressure lower than another part by the additional lack part of a 2nd layer, when this part is used as a steaming part, water vapor | steam is heated The container can be filled with water vapor to improve the heating efficiency of the contents while preventing the container from bursting. In the steaming section formed in this way, the width in which the internal space of the container communicates with the external space is stable, and a stable heating efficiency improvement effect with little variation between containers can be obtained.

  ADVANTAGE OF THE INVENTION According to this invention, the stable heating efficiency improvement effect can be acquired in the container which can heat the content, without opening.

It is a perspective view of a container concerning a 1st embodiment of the present invention. It is a fragmentary sectional view of the container shown in FIG. It is a figure which shows the structure of the steaming part of the container shown in FIG. It is a figure which shows the structure of the steaming part of the container which concerns on the 2nd Embodiment of this invention. It is a figure which shows the modification of the example shown in FIG. It is a figure which shows the structure of the steaming part of the container which concerns on the 3rd Embodiment of this invention. It is a figure which shows the modification of embodiment of this invention.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In addition, in this specification and drawing, about the component which has the substantially same function structure, the duplicate description is abbreviate | omitted by attaching | subjecting the same code | symbol.

(First embodiment)
FIG. 1 is a perspective view of a container according to the first embodiment of the present invention. FIG. 1A shows a state before opening, and FIG. 1B shows a state during opening. FIG. 2 is a partial cross-sectional view of the container shown in FIG. 2A is a cross-sectional view taken along line IIA-IIA shown in FIG. 1A, and FIG. 2B is a cross-sectional view taken along line IIB-IIB shown in FIG.

  The container 100 according to the present embodiment includes a container main body 110 and a lid body 130. The container body 110 has a substantially circular planar shape and includes a recess 111 and a flange portion 112 formed along the periphery of the recess 111. The flange portion 112 extends outward from the peripheral edge of the recess 111. The lid 130 is a film-like member that covers the opening of the recess 111, and is bonded to the container body 110 by using a heat seal, an ultrasonic seal, or the like in the bonding region 140 formed in the flange portion 112. An internal space SP is formed between the two.

  As shown in FIG. 2, the container body 110 is formed by forming a laminate 114 including a base material layer 114A and a surface layer 114B into a shape including a concave portion 111 and a flange portion 112 by vacuum forming or pressure forming. . The base material layer 114 </ b> A is located outside the container main body 110 and exhibits rigidity required for maintaining the shape of the container main body 110. The surface layer 114B is located inside the container main body 110, that is, on the side facing the internal space SP. In the bonding region 140, the lid body 130 is bonded to the surface layer 114 </ b> B of the stacked body 114. As will be described later, the bonding strength between the lid 130 and the surface layer 114B in the bonding region 140 is stronger than the interlayer bonding strength between the base material layer 114A and the surface layer 114B in the laminate 114.

  Here, the base material layer 114A of the laminate 114 is formed of a resin including at least one of the group consisting of an olefin resin, a polystyrene resin, and a polyester resin, for example. Examples of the olefin resin include polypropylene and polyethylene. Examples of the polyester resin include polyethylene terephthalate (PET). In order to improve rigidity, an inorganic filler such as talc may be added to the base material layer 114A.

  On the other hand, the surface layer 114B of the laminate 114 is formed of, for example, a polyolefin resin. Polyolefin resins include polypropylene resins such as homopolypropylene (HPP), random polypropylene (RPP), and block polypropylene, polyethylene resins such as high density polyethylene (HDPE), and low density polyethylene (LDPE), and Examples thereof include linear ethylene-α-olefin copolymers.

  In the illustrated example, the stacked body 114 includes two layers of the base material layer 114A and the surface layer 114B. However, in another example, the stacked body 114 may include an additional layer. For example, the laminate 114 may include a plurality of base material layers and an adhesive layer that bonds the base material layers together when high rigidity is required. The adhesive layer is formed of, for example, urethane elastomer, styrene elastomer, maleic anhydride-modified polyethylene, maleic anhydride-modified polypropylene, or ethylene vinyl acetate (EVA). In addition, the stacked body 114 may include a gas barrier layer that blocks oxygen and the like. The gas barrier layer is formed of, for example, ethylene-vinyl acetate copolymer saponified product (EVOH), polyvinylidene chloride (PVDC), or polyacrylonitrile (PAN).

  Furthermore, in this embodiment, an annular cut 115 is formed in the flange portion 112 of the container body 110 so as to be spaced apart and parallel to the concave portion 111 side of the joining region 140. As will be described later, the annular cut 115 is an example of a missing portion of the surface layer 114B. In the illustrated example, the annular notch 115 passes through only the surface layer 114B and does not reach the base material layer 114A, but the annular notch 115 may reach a part of the base material layer 114A. Alternatively, the annular cut 115 may not pass through the surface layer 114B, and may be left with a thickness that allows the surface layer 114B to be easily broken when the container 100 is opened. In addition, although the cross-sectional shape of the annular notch 115 is V-shaped in the illustrated example, it may be other shapes such as U-shaped or I-shaped.

  The lid 130 is composed of a film-like laminate 131 including an outer layer 131A and a seal layer 131B. The outer layer 131 </ b> A is located on the front side of the lid 130, i.e., the side not facing the container body 110, and exhibits flexibility and tensile strength required for the lid 130. The seal layer 131 </ b> B is located on the back side of the lid body 130, that is, the side facing the container main body 110, and is bonded to the surface layer 114 </ b> B of the stacked body 114 constituting the container main body 110 in the bonding region 140. Here, the outer layer 131A of the laminated body 131 is formed of, for example, a polyethylene terephthalate (PET) film or a biaxially stretched nylon film (O-Ny). In addition, the seal layer 131B of the laminate 131 is formed of a resin composition such as random polypropylene (RPP), block polypropylene (BPP), linear low density polyethylene (LLDPE), or polyethylene.

  In another example, the laminated body 131 constituting the lid body 130 does not necessarily have to be a film shape, and is a sheet-like laminated body formed into a predetermined shape like the laminated body 114 constituting the container body 110. It may be. In this case, it can be said that the container 100 includes a compatible first container body and a second container body. The laminated body constituting the first container main body includes the first layer and the second layer, and a missing portion is formed in the second layer, whereby the container 100 is utilized utilizing delamination between the first layer and the second layer. Can be opened. In the above example, the first container body is the container body 110 and the second container body is the lid body 130, but the first container body is the lid body 130 and the second container body is the container body 110, and the lid body 130 is configured. It is also possible to form a missing part in the second layer of the laminate. Similar configurations are possible in other embodiments described later.

(Opening the container)
Next, the opening operation of the container 100 as described above will be described. In the container 100, as shown in FIG. 2A, a part of the lid body 130 forms a tab extending from the peripheral edge of the flange portion 112 of the container main body 110. The user can easily grasp the tab portion of the lid 130 and start opening the container 100 by peeling the lid 130 from the tab portion.

  Here, as described above, the bonding strength between the lid body 130 and the surface layer 114B in the bonding region 140 is stronger than the interlayer bonding strength between the base material layer 114A and the surface layer 114B of the stacked body 114. Therefore, when the user peels off the lid body 130 as described above, the surface layer 114B joined to the lid body 130 is peeled off together with the lid body 130 in the joining region 140 near the end of the laminated body 114. The base layer 114A and the surface layer 114B of the body 114 are delaminated.

  Further, when the user peels off the lid 130, as shown in FIG. 2B, the surface layer 114B is separated from the lid 130 by the annular cut 115, and only the lid 130 is peeled off from there. This is because, as described above, the annular cut 115 is formed through the surface layer 114B, or the thickness is such that the surface layer 114B can be easily broken by the annular cut 115.

  The container 100 according to the present embodiment is opened by the procedure as described above. If the interlayer bonding strength between the base material layer 114A and the surface layer 114B of the laminated body 114 is weakened, the force with which the user peels off the lid body 130 at the time of opening can be reduced, and the opening becomes easy. On the other hand, in the state where the container body 110 and the lid body 130 are joined to each other before opening, the internal pressure of the internal space SP is applied to the joining region 140, more specifically, to the edge portion on the concave portion 111 side of the joining region 140. concentrate. Since the annular notch 115 is separated from the edge of the joining region 140, the concentrated internal pressure is prevented from acting to delaminate the laminate 114 starting from the annular notch 115. Therefore, even if the opening is facilitated by weakening the interlayer bonding strength as described above, it is possible to counter high internal pressure by increasing the bonding strength between the lid 130 and the surface layer 114B. it can. Thus, in the container 100 which concerns on this embodiment, both opening property and internal pressure resistance can be made compatible.

(Configuration of the steaming section)
FIG. 3 is a diagram showing the configuration of the steaming section of the container shown in FIG. In the present embodiment, as shown in FIG. 1, the steaming part 120 is formed in the flange part 112 of the container 100. Here, the steaming part 120 is a part capable of communicating the internal space SP with the external space when the internal pressure of the internal space SP of the container 100 increases. As shown in FIG. 3, in the steaming part 120, a protruding part 140 </ b> P in which the joining region 140 protrudes toward the annular notch 115 in a part of the circumferential direction of the flange part 112, and the annular notches 115 on both sides of the protruding part 140 </ b> P. A cross cut 121 extending in the width direction of the flange portion 112 toward the joining region 140 is formed. The cross cut 121 is formed in at least the surface layer 114B of the multilayer body 114, like the circular cut 115, but may reach part of the base material layer 114A or may not penetrate the surface layer 114B. Good. Further, the cross-sectional shape of the cross cut 121 may be V-shaped like the circular cut 115, or may be other shapes such as U-shape or I-shape.

  In the steaming section 120, the protrusion 140P in which the joining region 140 projects toward the annular cut 115 is formed, so that the distance between the annular cut 115 and the joining region 140 becomes smaller than other portions. The container main body 110 and the lid body 130 are peeled off at a pressure lower than that of other portions. As described above, in the state where the container main body 110 and the lid body 130 are bonded to each other before opening, the internal pressure of the internal space SP is concentrated on the edge portion on the concave portion 111 side of the bonding region 140, but the annular cut 115 is formed in the bonding region. Since it is separated from the edge part of 140, it is prevented that the internal pressure acts to delaminate the laminated body 114 from the annular notch 115 as a starting point. By forming the protruding portion 140P in the steaming portion 120, the distance between the edge of the joining region 140 where the internal pressure is concentrated (that is, the tip portion of the protruding portion 140P) and the annular notch 115 is reduced, and the internal pressure is circular. The laminate 114 can act to delaminate from the notch 115. Therefore, in the steaming section 120, the container body 110 and the lid body 130 are separated at a lower pressure than the other parts.

  The cross cut 121 has a function of stabilizing a region where the container main body 110 and the lid 130 are separated from each other in the steaming section 120 as described above. When the container main body 110 and the lid 130 are separated at the steaming section 120, the separation occurs from the section S1 of the annular cut 115 near the protrusion 140P. In the illustrated example, the starting points of the pair of intersecting cuts 121 formed on both sides of the protruding portion 140P coincide with both ends of the section S1. Since the cross cut 121 is formed in the width direction of the flange portion 112 starting from both ends of the section S1, the separation between the container main body 110 and the lid 130 generated from the section S1 is along the cross cut 121. Guided toward the bonding area 140. In this manner, in the present embodiment, the cross notch 121 is formed, so that the separation between the container main body 110 and the lid body 130 in the steaming section 120 spreads in the circumferential direction of the flange section 112 beyond the section S1. It is prevented.

  Note that the separation between the container main body 110 and the lid body 130 guided along the cross cuts 121 proceeds toward the joining region 140 even without the cross cuts 121 from the middle. It does not have to reach the joining region 140.

  In the present embodiment, by forming the above-described steaming section 120, the internal space that has risen due to the generation of water vapor when the contents such as food are heated in the microwave oven without opening the container 100 Due to the internal pressure of the SP, the lid 130 and the container main body 110 are separated from each other by the vapor transmission section 120, and the internal space SP communicates with the external space, whereby a part of the water vapor generated from the heated contents is vaporized. While being discharged | emitted through the part 120, heating efficiency improves by also being filled with water vapor | steam also in a container. At this time, the cross notch 121 is formed in the steaming part 120, so that the separation between the container main body 110 and the lid body 130 is prevented from spreading along the annular notch 115 to the outside of the steaming part 120. The internal space SP communicates with the external space reliably in the width of the vapor passage 120, specifically, the section S1 of the annular cut 115. Therefore, in the present embodiment, the amount of water vapor released from the steaming section 120 and the amount of water vapor filled in the container are substantially constant in each container, and stable heating efficiency is improved with little variation between containers. An effect can be obtained.

  Further, as a secondary effect, in the present embodiment, the internal space SP can be communicated with the external space with the width of the section S1 of the annular cut 115 in the steaming section 120 with certainty. Therefore, if the section S1 is designed to be relatively short, a large amount of water vapor flows out vigorously when the gap between the lid 130 and the container main body 110 is peeled off at the steaming section 120, so that a bursting sound is generated. Can be prevented.

(Second Embodiment)
FIG. 4 is a diagram illustrating a configuration of a steaming section of a container according to the second embodiment of the present invention. In addition, since the structure of this embodiment is the same as that of said 1st Embodiment except the structure of the vaporization part demonstrated below, the overlapping description is abbreviate | omitted. As shown in FIG. 4, in the steaming part 220 formed in the flange part 112 of the container 100 in this embodiment, the edge part on the concave part 111 side of the joining region 140 is partly in the circumferential direction of the flange part 112. An additional cut 221 is formed, and a cross cut 222 extending in the width direction of the flange portion 112 from both sides of the additional cut 221 toward the annular cut 115 is formed. The additional cut 221 is, for example, a missing portion of the surface layer 114B of the stacked body 114 formed in the same manner as the circular cut 115. The cross notch 222 is formed in at least the surface layer 114B of the laminate 114, like the annular notch 115, but may reach part of the base material layer 114A or may not penetrate the surface layer 114B. Good. Further, the cross-sectional shape of the cross cut 222 may be V-shaped similarly to the circular cut 115, or may be other shapes such as U-shape or I-shape.

  In the steaming section 220, the space between the container main body 110 and the lid body 130 is peeled off at a pressure lower than that of other portions in the section S2 where the additional cut 221 overlapping the joining region 140 is formed. As described above, in the state where the container main body 110 and the lid body 130 are bonded to each other before opening, the internal pressure of the internal space SP is concentrated on the edge portion on the concave portion 111 side of the bonding region 140, but the annular cut 115 is formed in the bonding region. Since it is separated from the edge part of 140, it is prevented that the internal pressure acts to delaminate the laminated body 114 from the annular notch 115 as a starting point. In the steaming part 220, the missing portion of the surface layer 114B of the laminate 114 is formed at the edge of the joining region 140 where the internal pressure is concentrated by the additional cut 221. It can act to delaminate the body 114. Therefore, in the steaming section 220, the container body 110 and the lid body 130 are separated at a lower pressure than the other parts.

  The cross cut 222 has a function of stabilizing the region where the container main body 110 and the lid 130 are separated from each other in the steaming section 220 as described above. When the container main body 110 and the lid body 130 are separated from each other by the steaming section 220, the separation occurs in the section S2 where the additional cut 221 is formed. In the illustrated example, the starting points of the pair of cross cuts 222 formed on both sides of the additional cut 221 coincide with both ends of the section S2. Since the cross cuts 222 are formed in the width direction of the flange portion 112 starting from both ends of the section S2, the laminate 114 is easily delaminated in the section S2. Although delamination starting from the cross notch 222 also occurs, in the illustrated example, the cross notch 222 does not reach the annular notch 115, and therefore, the container body 110 and the end of the cross notch 222 and the annular notch 115 are separated from each other. An area where the cover 130 is not separated remains. Therefore, in the present embodiment, the range in which the vapor can be passed by the separation between the container main body 110 and the lid 130 in the vapor passage 220 is substantially limited to the section S2.

  Here, in the above example, since the cross notch 222 does not reach the annular notch 115, the stress generated by the internal pressure is dispersed as indicated by the arrow F in FIG. Since the stress is transmitted along the cross cuts 222, the points from the end points of the cross cuts 222 are distributed radially. Due to the dispersion of such stress, in the present embodiment, excessive delamination does not occur in the stacked body 114 except for the section S2, and the width at which the internal space SP communicates with the external space can be stabilized in the steaming section 220. . From the viewpoint of dispersing the stress, as a modified example of the present embodiment, it is possible to form the additional cut 221 and not form the cross cut 222 as in the steaming section 220A shown in FIG. Also in this case, the stress generated by the internal pressure is distributed radially from the end point of the additional cut 221, and the laminate 114 can be prevented from causing excessive delamination as in the example of FIG. 4.

  In the above example, it has been described that the cross notch 222 does not reach the annular notch 115. However, for example, the part of the cross notch 222 away from the additional notch 221 is separated from the edge of the joining region 140. If the delamination of the laminate 114 does not progress due to the above, a region where the container body 110 and the lid body 130 do not peel remains regardless of the presence or absence of the cross notch 222. May be reached.

  Although the additional cut 221 is described as being along the edge of the bonding region 140 on the concave portion 111 side, the edge of the bonding region 140 and the additional cut 221 may not exactly match. . Specifically, for example, there may be a slight gap between the edge of the joining region 140 and the additional notch 221, and the joining region 140 may slightly exceed the additional notch 221. .

  In the second embodiment of the present invention described above, the same effect as that of the first embodiment described above, that is, the amount of water vapor released from the steaming section 120 and the amount of water vapor filled in the container. It becomes almost constant in each container, and a stable heating efficiency improving effect with little variation between containers can be obtained. In addition, if the section S2 is designed to be relatively short, it is possible to prevent a plosive sound from being generated when the lid 130 and the container main body 110 are peeled off by the steaming section 120. As compared with the first embodiment, in this embodiment, no protrusion is formed in the bonding region 140, and the bonding region 140 has a uniform width in the circumferential direction. It is possible to allow a certain degree of alignment error in the circumferential direction of the seal board. In the case of the first embodiment, if the protrusion 140P and the cross notch 121 overlap due to a circumferential alignment error, the above-described effects are hardly obtained. However, in this embodiment, in order to keep the positional relationship between the additional notch 221 and the edge of the joining region 140 on the concave portion 111 side within the range as described above, the radial alignment of the seal disc is as follows. Some degree of accuracy is required.

(Third embodiment)
FIG. 6 is a diagram showing the configuration of the steaming section of the container according to the third embodiment of the present invention. In addition, since the structure of this embodiment is the same as that of said 1st Embodiment except the structure of the steaming part and junction area | region demonstrated below, the overlapping description is abbreviate | omitted. As shown in FIG. 6, in the steaming part 320 formed in the flange part 112 of the container 100 in this embodiment, the edge part on the concave part 111 side of the joining region 340 is partly in the circumferential direction of the flange part 112. An additional cut 321 along the line and a cross cut 322 extending in the width direction of the flange portion 112 from both sides of the additional cut 321 toward the annular cut 115 are formed. The configuration of the additional cut 321 and the cross cut 322 is the same as that of the additional cut 221 and the cross cut 222 described in the second embodiment. In the illustrated example, the edge of the bonding region 340 on the recess 111 side is formed in a waveform, and the additional cut 321 intersects the waveform of the edge of the bonding region 340.

  With the configuration as described above, as in the second embodiment, the laminate 114 is delaminated in the section S3 in which the additional cuts 321 are formed in the steaming section 320, whereby the container body 110 and the lid body 130 are separated. Is peeled off. In addition, in the present embodiment, the internal pressure is concentrated at a point where the waveform of the edge of the joining region 340 and the additional cut 321 intersect, so that the container main body 110 and the lid body 130 can be more reliably secured at a predetermined internal pressure. Can be separated. Also in this embodiment, by forming the cross cuts 322 from both ends of the additional cuts 321, the laminate 114 is easily delaminated in the section S3. Further, in the illustrated example, the cross notch 322 does not reach the annular notch 115, and a region where the container main body 110 and the lid 130 are not separated remains between the end point of the cross notch 322 and the annular notch 115. In the same manner as in the second embodiment, the range in which the steam can be passed in the steaming section 320 is substantially limited to the section S3 and the cross notch 322 can be omitted. .

(Modification)
FIG. 7 is a diagram showing a modification of the embodiment of the present invention. As shown in FIG. 7, in this modification, instead of the annular cut 115 formed in the flange portion 112 of the container main body 110, the boundary between the flange portion 112 and the recess 111 located on the recess 111 side with respect to the joining region 140. The annular thin portion 116 of the surface layer 114B is formed in the vicinity. For example, when the laminated body 114 is formed into a shape including the concave portion 111 and the flange portion 112, the annular thin portion 116 is formed by causing the resin of the base material layer 114A to bulge toward the surface layer 114B by pressing the flange portion 112. It is formed. In the annular thin portion 116, the surface layer 114B may be partially thinly shaped as in the illustrated example, or the surface layer 114B may be partially interrupted.

  Even when the annular thin portion 116 is formed on the surface layer 114B as in the present modification, the annular thin portion 116 has a thickness that allows the surface layer 114B to be interrupted or easily broken. When the container 100 is opened, the surface layer 114B is separated from the lid 130 by the annular thin portion 116, and only the lid 130 is peeled off from there. That is, the annular thin portion 116 in this modification has the same function as the annular notch 115 in the first embodiment. In this specification, the portion that cuts the surface layer 114B in this way or has a thickness that can be easily broken is also referred to as a missing portion of the surface layer 114B. As long as the annular notch 115 and the annular thin portion 116 have the same functions as described above, the shape of the missing portion may be any shape, and is not necessarily limited to the shape called the notch or thin portion.

  This modification can be applied to each of the first embodiment and the second embodiment described above. When applied to the first embodiment, the cross-cuts 121 formed in the steaming portion 120 are portions where the surface layer 114B of the annular thin portion 116 is thinnest on both sides of the protrusion 140P of the joining region 140, or The surface layer 114B is formed starting from the discontinuous portion. When applied to the second embodiment, as described above, the cross cuts 222 formed in the vapor passage section 220 do not have to reach the missing portions of the surface layer 114B (annular cuts 115 in the example of FIG. 4). Even when the annular thin portion 116 according to the modification is formed, the configuration of the cross cut 222 does not change.

  The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to these examples. It is obvious that those skilled in the art to which the present invention pertains can come up with various changes or modifications within the scope of the technical idea described in the claims. Of course, it is understood that it belongs to the technical scope of the present invention.

  DESCRIPTION OF SYMBOLS 100 ... Container, 110 ... Container main body, 111 ... Recessed part, 112 ... Flange part, 114 ... Laminated body, 114A ... Base material layer, 114B ... Surface layer, 115 ... Annular cut, 116 ... Annular thin part, 120, 220 ... Through Steaming part, 121, 222 ... cross cut, 221 ... additional cut, 130 ... lid, 131 ... laminated body, 131A ... outer layer, 131B ... seal layer, 140 ... joining region, 140P ... projecting part, SP ... internal space.

Claims (7)

A first container body comprising a laminate including at least a first layer and a second layer, including a recess and a flange formed along the periphery of the recess and extending outward from the periphery;
A container comprising: a second container body that forms an internal space between the concave portion by being bonded to the second layer in a bonding region formed in the flange portion;
The bonding strength between the second container body and the second layer is stronger than the interlayer bonding strength between the second layer and the first layer,
The missing portion of the second layer is formed in parallel with the separation region in parallel to the concave portion side,
A projecting portion is formed in which a part of the flange portion in the circumferential direction projects the joining region toward the missing portion,
A container in which cuts extending in the width direction of the flange portion from the missing portion toward the joining region are formed in at least the second layer on both sides of the protruding portion.   The container according to claim 1, wherein the notch does not reach the joining region. A first container body comprising a laminate including at least a first layer and a second layer, including a recess and a flange formed along the periphery of the recess and extending outward from the periphery;
A container comprising: a second container body that forms an internal space between the concave portion by being bonded to the second layer in a bonding region formed in the flange portion;
The bonding strength between the second container body and the second layer is stronger than the interlayer bonding strength between the second layer and the first layer,
The missing portion of the second layer is formed in parallel with the separation region in parallel to the concave portion side,
A container in which an additional missing portion of the second layer is formed along an edge of the joint region on the concave side in a part of the flange portion in the circumferential direction.   The container according to claim 3, wherein a cut is formed in at least the second layer extending in a width direction of the flange portion from both sides of the additional missing portion toward the missing portion.   The container according to claim 4, wherein the notch does not reach the missing portion. An edge portion on the concave side of the joining region is formed in a waveform,
The container according to claim 4 or 5, wherein the additional missing portion intersects the waveform of the edge portion.   The cutout portion is formed with a cut at least in the second layer, the second layer is partially thinned, or the second layer is partially interrupted. The container according to any one of the above.

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