JP2018167862A - Container with lid - Google Patents

Abstract

An object of the present invention is to reduce the internal volume of a container during sterilization and increase the internal volume of the container by heating with a microwave oven. A container 10 with a lid includes a container 20 including a body portion 21 and a flange portion 22, a lid 30 disposed on an upper surface of the flange portion 22 so as to cover the container 20, an upper surface of the flange portion 22, and the lid 30. And a joint portion 40 formed between the lower surface and the lower surface. The body portion 21 can take an inner position that enters the inside of the container 20 and an outer position that protrudes outward from the container 20. [Selection] Figure 3

Description

  The present invention relates to a lidded container provided with a container in which a storage part is formed and a lid joined to the container so as to seal the storage part of the container from the outside.

  2. Description of the Related Art Conventionally, many items such as cooked or semi-cooked foods that have been sealed by heat sealing with a lid made of a film or the like are placed on the market. The contents are heated by a microwave oven or the like while being stored in a plastic container. Such a container has a structure for degassing the expanded air inside the container when heated by a microwave oven (see Patent Document 1).

  By the way, the lidded container in which the contents are stored in the container storage part and the container storage part is sealed by heat-sealing the lid is sterilized by boiling or retort processing. Next, sterilized containers with lids are supplied to the market. In addition, as a technique for processing food non-thermally, a food preservation technique by high pressure treatment in which a food is subjected to a high pressure treatment at 600 MPa or the like to maintain a raw flavor and color is also known.

  The user heats the sterilized lidded container in the microwave oven, then opens the lidded container and removes the lid from the container. The user then uses the container as normal tableware and eats the contents in the container.

  By the way, the container of the lidded container has a certain size of inner volume so that it can be used as normal tableware. However, when the container with the lid is subjected to boiling, retort processing, or high pressure processing, the inner volume of the container. Large head space is generated in the container.

  When the head space in the container becomes large, sterilization time in boil or retort treatment or high-pressure treatment is required, and the production efficiency is lowered.

Japanese Utility Model Publication No. 3-87688

  The present invention has been made in consideration of such points, and the container with a lid can reduce the inner volume of the container during sterilization and can increase the inner volume of the container after being heated in a microwave oven. The purpose is to provide.

  The present invention provides a container including a body part defining a storage part for storing contents, a flange part connected to an upper part of the body part, and the flange part so as to cover the storage part of the container. A lid disposed on the upper surface, and in a cross-sectional view, the barrel portion of the container is foldable so as to take an inner position that enters the inside of the container and an outer position that projects to the outside of the container. It is an attached container.

  The present invention is the lidded container, wherein the body portion has a folding line extending in a circumferential shape, and the body portion is bent through the bending line when the body portion takes an inner position.

  This invention is a container with a lid | cover in which the said bending line is formed more thinly than the other part of a trunk | drum.

  This invention is a container with a lid | cover which the center part moves to an up-down direction, and takes an inner side position and an outer side position.

  The present invention is the container with a lid, wherein the body portion includes a bottom surface and a side surface.

  The present invention relates to a container having a body part defining a storage part for storing contents, and a flange part connected to the upper part of the body part, and the body part of the container enters the inside of the container. It is a container that can be bent to take a position and an outer position that protrudes to the outside of the container.

  In the lidded container according to the present invention, the body portion can take an inner position during sterilization to reduce the internal volume in the container. By heating with a microwave oven, the internal pressure rises, and the body portion can take an outer position to increase the internal volume in the container.

FIG. 1 is an exploded view of members constituting the lidded container in the embodiment of the present invention. FIG. 2 is a plan view showing the lidded container in the embodiment of the present invention. FIG. 3 is a cross-sectional view showing the case with the lidded container shown in FIG. 2 taken along line III-III. FIG. 4 is a cross-sectional view showing a modification of the lidded container. FIG. 5 is a cross-sectional view showing an example of the layer structure of the lid. FIG. 6A is a perspective view showing the container with a lid when the inner position is taken, and FIG. 6B is a perspective view seen from the bottom side. Fig.7 (a) is a perspective view which shows the container with a lid when the outer side position is taken, FIG.7 (b) is the perspective view seen from the bottom face side. FIG. 8 is a cross-sectional view of a lidded container according to a modification of the present invention. FIG. 9 is a cross-sectional view of a lidded container according to a modification of the present invention. FIG. 10 is a view showing a modification of the folding line provided in the container. FIG. 11 is a view showing another modification of the folding line provided in the container.

<First Embodiment>
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. 1 to 6A and 6B. In the drawings attached to the present specification, for the sake of illustration and ease of understanding, the scale, vertical and horizontal dimensional ratios, and the like may be appropriately changed and exaggerated from those of the actual product.

  In addition, as used in this specification, the shape and geometric conditions and the degree thereof are specified, for example, terms such as “parallel”, “orthogonal”, “identical”, length and angle values, etc. are strictly Without being bound by meaning, it should be interpreted including the extent to which similar functions can be expected.

(Container with lid)
First, with reference to FIG. 1 thru | or FIG. 3, the outline of the container 10 with a lid | cover is demonstrated. FIG. 1 is an exploded view of members constituting the lidded container 10, and FIG. 2 is a plan view of the lidded container 10. FIG. 3 is a cross-sectional view showing the case with the lid shown in FIG. 2 taken along line III-III.

  The lidded container 10 includes a container 20 in which a storage unit 25 for storing the contents 1 is formed, a lid 30 that covers the storage unit 25 of the container 20, a joint unit 40 that joins the lid 30 to the container 20, Is provided. The lidded container 10 further includes a steam release mechanism 18 that discharges the steam generated in the storage unit 25 when the contents 1 are heated to the outside of the storage unit 25. In the present specification, “joining” is a concept including both welding and adhesion. “Welding” means attaching the lid 30 to the container 20 by at least partially melting at least one of the container 20 and the lid 30. The term “adhesion” means that the lid 30 is attached to the container 20 using components such as an adhesive that are separate from the container 20 and the lid 30.

  The content 1 accommodated in the container 20 contains at least water. Examples of contents include retort food, frozen food, refrigerated food, and the like. Examples of food include curry, rice cake, yakisoba, side dish, fish and the like. In these contents 1, since moisture evaporates with heating and the pressure of the storage unit 25 of the container 20 increases, a steam venting mechanism 18 for escaping the steam in the storage unit 25 to the outside is necessary for the lidded container 10. become.

  Hereinafter, the container 20, the lid 30, the joint portion 40, and the steam release mechanism 18 will be described.

〔container〕
As shown in FIGS. 1 to 3, the container 20 includes a barrel portion 21 that defines the storage portion 25, and a flange portion 22 that is connected to the upper portion of the barrel portion 21 over the entire circumference. The trunk | drum 21 contains the bottom face 21a and the side surface 21b standingly arranged from the bottom face 21a so that it may spread over a circumference along the outer edge of the bottom face 21a, for example. As shown in FIG. 3, the bottom surface 21a may be formed with a raised portion 21c raised upward. The flange portion 22 is connected to the upper edge of the side surface 21b of the body portion 21, and extends in the horizontal direction toward the outside. In the present specification, terms such as “side surface”, “upper portion”, “upper edge”, “upper surface”, “lower surface”, and “horizontal direction”, which will be described later, indicate that the storage portion 25 of the container 20 opens upward. The position and direction of the lidded container 10, the container 20, the lid 30, and their constituent elements are represented with reference to the state where the lidded container 10 is placed. Further, the “outside position” is a side away from the center point 25c of the storage portion 25 of the container 20 in plan view. Further, an “inner position” described later is a side closer to the center point 25 c of the storage unit 25 of the container 20. The central portion 21 c 1 of the raised portion 21 c of the bottom surface 21 a of the trunk portion 21 becomes the central portion 21 c 1 of the trunk portion 21.

  In the present embodiment, the flange portion 22 has a substantially rectangular (substantially rectangular) outline. For example, the flange portion 22 includes a pair of long side portions 22a, a pair of short side portions 22b, and a corner portion 22c located between the long side portion 22a and the short side portion 22b. The direction in which the long side portion 22a extends and the direction in which the short side portion 22b extends are orthogonal to each other. In FIG. 2, symbol L1 represents the distance between the outer edge of one short side portion 22b and the outer edge of the other short side portion 22b, and symbol L2 represents the outer edge of one long side portion 22a and the other edge. The distance between the outer edge of the long side portion 22a is shown. The length L1 is larger than the length L2.

  As shown in FIG. 2, the corner 22 c may have a curved shape that is convex outward. Such a corner 22c is obtained, for example, by chamfering the corner of the flange having a rectangular outline. Although not shown, the corner 22c may have an angular shape. Also, some of the corners 22c may be tabs 22d that protrude outward from the other corners 22c.

  FIG. 2 shows an example in which the pair of long side portions 22a are parallel to each other, the pair of short side portions 22b are parallel to each other, and the long side portions 22a and the short side portions 22b are orthogonal to each other. However, it is not limited to this. For example, the pair of long side portions 22a may be non-parallel to each other, and the pair of short side portions 22b may be non-parallel to each other. Further, the angle formed by the long side portion 22a and the short side portion 22b may be shifted from 90 degrees.

  As shown in FIGS. 1 and 2, a concave portion 26 that is recessed inward is formed in a part of the outer edge 22 y of the flange portion 22. The recess 26 is one of the elements that constitute the above-described steam release mechanism 18. Details of the recess 26 will be described later.

  FIG. 3 is a cross-sectional view of the lidded container 10 of FIG. 2 taken along the line III-III that does not pass through the recess 26. In the example shown in FIG. 3, the flange portion 22 spreads flatly from the inner edge 22x to the outer edge 22y. However, the present invention is not limited to this, and the flange portion 22 may include an inclined surface or a non-flat surface. For example, as illustrated in FIG. 4, the flange portion 22 may include an inclined surface 22 e that is inclined downward and reaches the outer edge 22 y. In this case, the lid 30 may not be joined to the inclined surface 22e.

  In FIG. 3, the symbol T represents the thickness of the container 20. The thickness T of the container 20 is, for example, not less than 0.1 mm and not more than 1.0 mm. As the thickness T of the container 20 decreases, for example, when the thickness T of the container 20 is 100 μm or more and 300 μm or less, the side surface 21b or the flange portion 22 of the container 20 is likely to be deformed, and when the thickness T is 200 μm or less, Deformation is more likely to occur.

  Further, when the container 20 contains a rubber component or an ethylene component, the container 20 is likely to be deformed. When the container 20 is made of, for example, a block polypropylene containing a rubber component or an ethylene component, rigidity and heat resistance are reduced as compared to a homopolypropylene containing no rubber component or ethylene component.

  As a method for producing the container 20, an injection molding method or a sheet molding method may be employed. When manufacturing the container 20 by injection molding, in order to ensure moldability, it is preferable that the height H1 of the container 20 is not more than the above-described distance L2. The sheet molding method is a method of forming a desired shape on a sheet by pressing a mold against a plastic sheet. Examples of the material constituting the container 20 include plastics such as polystyrene, polypropylene, and polyethylene terephthalate.

  Moreover, when producing the container 20 by processing a plastic sheet by a deep drawing method which is a kind of sheet forming method, a sheet having a thickness of 100 μm or more and 300 μm or less can be used. Examples of the laminate constituting the sheet include CPP / CNy / CPP and LLDPE / CNy / LLDPE. Here, “CPP” is unstretched polypropylene, “CNy” is unstretched nylon, and “LLDPE” is linear low-density polyethylene.

  Next, the container 20 will be further described with reference to FIG. As described above, the container 20 includes the barrel portion 21 that defines the storage portion 25, and the flange portion 22 that is connected to the upper portion of the barrel portion 21. Among these, the trunk | drum 21 has the bottom face 21a containing the protruding part 21c, and the side surface 21b. In this case, a bent line 21A extending in a circumferential shape is formed on the side surface 21b of the trunk portion 21, and a bent line 21B extending in a circumferential shape is also formed between the bottom surface 21a and the side surface 21b.

  As a result, the body portion 21 of the container 20 is bent through the two bending lines 21A and 21B described above, and the inner position (indicated by a two-dot chain line in FIG. 3) entering the inner side of the container 20 in a sectional view. And the outer position (solid line position of FIG. 3) which protrudes to the outer side of the container 20 can be taken. In addition, although the two bending lines 21A and 21B were provided in the trunk | drum 21 of the container 20, the example which made the trunk | drum 21 of the container 20 bendable by these two folding lines 21A and 21B was shown. For example, in a form in which the body 21 of the container 20 has an outwardly convex arc shape, the body 21 may be provided with only a single bent line 21A.

As described later, the lidded container 10 is boiled or retorted after manufacture and sterilized, and then supplied to the market. At the time of sterilization, the barrel portion 21 takes an inner position to reduce the internal volume of the container 20. The boil or retort treatment is efficiently performed.
<Boil processing>
Here, the boil treatment refers to heat sterilization using hot water bath. Since no pressure is applied in the boil treatment, the temperature of the hot water bath is 100 ° C. or lower.
<Retort processing>
On the other hand, the retort treatment refers to pressurized heat sterilization using steam or pressurized hot water. Since pressurization is performed in the retort process, the temperature of steam or pressurized hot water can be made higher than 100 ° C.

  After the sterilization, when the user heats the lidded container 10 with a microwave oven, the pressure in the container 20 rises, and the body portion 21 is bent through the folding lines 21A and 21B and protrudes outward. Therefore, the container 20 can be used as a normal tableware by taking the outer position of the container 20 and increasing the inner volume of the container 20.

  The two bent lines 21A and 21B extending in a circumferential shape are linear portions formed thinner than the other portions of the trunk portion 21, and the trunk portion 21 is interposed via the bent lines 21A and 21B. Can be folded easily.

    Next, modified examples of the bent lines 21A and 21B formed on the body portion 21 will be described with reference to FIGS. In the above-described embodiment, the folding lines 21A and 21B formed on the trunk portion 21 are examples including a linear portion formed thinner than other portions of the trunk portion 21. As shown in FIG. 10, the body portion 21 may be provided with a bent line 21 </ b> A formed of a linear protrusion extending in a circumferential shape protruding inward. In FIG. 10, the bent line 21A has a structure like a ruled line of a carton, for example.

  Alternatively, as shown in FIG. 11, the container 20 includes a barrel portion 21 that defines the storage portion 25, and a flange portion 22 that is connected to the upper portion of the barrel portion 21 over the entire circumference. The trunk | drum 21 contains the bottom face 21a and the side surface 21b standingly arranged from the bottom face 21a so that it may spread over a circumference along the outer edge of the bottom face 21a, for example. As shown in FIG. 11, the bottom surface 21a is formed with a raised portion 21c raised upward. Further, as shown in FIG. 11, a plurality of reinforcing ribs 52 extending in the vertical direction are provided on the side surface 21 a of the body portion 21. The reinforcing rib 52 can be configured to be convex toward the outer surface of the side surface 21a, for example. The reinforcing rib 52 is for increasing the strength of the side surface 21a. Further, a linear region 53 in which the reinforcing rib 52 is not provided extends in the horizontal direction on the side surface 21a of the trunk portion 21, and a linear shape extending in a circumferential shape in which the reinforcing rib 52 is not provided. The body portion 21 may be bent by the region 53. In this case, the linear area | region 53 extended on the periphery of the trunk | drum 21 functions as the bending line 21A. In FIG. 11, the region 53 is indicated by a two-dot chain line.

〔lid〕
The lid 30 is disposed on the upper surface 23 of the flange portion 22 so as to cover the storage portion 25 of the container 20, and is joined to the upper surface 23 of the flange portion 22 by the joint portion 40. The lower surface 32 of the lid 30 is configured to be joined to the upper surface 23 of the flange portion 22. FIG. 5 is a cross-sectional view showing an example of the layer configuration of the lid 30. As shown in FIG. 5, the lid 30 includes at least a sealant layer 35 constituting the lower surface 32 of the lid 30 and a base material 34 laminated on the sealant layer 35.

  As a material constituting the substrate 34, a polyester resin such as polyethylene terephthalate (PET), a polyamide resin such as nylon (Ny), or a polyolefin resin such as polypropylene (PP) can be used. The substrate 34 may be composed of a film stretched uniaxially or biaxially. The thickness of the base material 34 is 5 micrometers or more and 50 micrometers or less, for example.

  As a material constituting the sealant layer 35, one or more resins selected from polyethylene (PE) such as low density polyethylene (LDPE) and linear low density polyethylene (LLDPE), and polypropylene (PP) are used. Can be used. The sealant layer 35 may be a single layer or a multilayer. The sealant layer 35 is preferably unstretched.

  The sealant layer 35 preferably has an easy peel property. The easy peel property is a characteristic that when the lid 30 is peeled from the flange portion 22 of the container 20, the lid 30 is easily peeled from the upper surface 23 of the flange portion 22 at the lower surface 32 thereof, that is, at the interface of the sealant layer 35. is there. The easy peel property can be expressed, for example, by configuring the sealant layer 35 with two or more kinds of resins and making one resin and another resin incompatible. As resin which can express an easy peel property, the mixed resin of polyethylene (PE) and polypropylene (PP) is mentioned, for example.

  The form in which the lid 30 is peeled from the flange portion 22 of the container 20 is not limited to peeling at the interface of the sealant layer 35 (peeling between the upper surface 23 of the flange portion 22 and the surface of the sealant layer 35). For example, the lid 30 may be peeled off from the flange portion 22 due to cohesive failure of the sealant layer 35, and the lid 30 may be peeled off between one layer constituting the lid 30 and another layer adjacent thereto. May peel from the flange portion 22.

  The thickness of the sealant layer 35 is preferably 20 μm or more and 100 μm or less, and more preferably 30 μm or more and 80 μm or less.

  The lid 30 may further include other layers. As the other layer, an appropriate layer can be selected according to required performance such as water vapor and other gas barrier properties, light shielding properties, various mechanical strengths, and the like. For example, as a gas barrier layer, a vapor deposition layer of a metal oxide such as aluminum oxide or an inorganic oxide such as silicon oxide, an ethylene-vinyl alcohol copolymer (EVOH), a polyvinylidene chloride resin (PVDC), or a fat such as nylon MXD6 Group polyamides and the like may be provided. By providing such a gas barrier layer, it is possible to prevent oxygen and water vapor from entering the inside of the lidded container 10. Further, a support may be provided in order to impart mechanical strength to the lid member. As the support, the same material as that constituting the substrate 34 can be used. The gas barrier layer and the support may be provided between the base material 34 and the sealant layer 35, or may be provided on the surface of the base material 34 opposite to the sealant layer 35.

  Examples of the method of laminating the base material 34 and the sealant layer 35 include a melt extrusion method and a dry lamination method. In the melt extrusion method, a material constituting the sealant layer 35 is extruded onto a film including the base material 34. In the dry laminating method, a sealant layer 35 made of a film formed in advance and a film including the base material 34 are bonded together using an adhesive. When using the dry laminating method, as shown in FIG. 3, the lid 30 is located between the base material 34 and the sealant layer 35 and further includes an adhesive layer 36 made of an adhesive layer or an adhesive resin layer.

  The adhesive layer is used when two layers are bonded using a dry laminating method. Examples of the adhesive include one-part or two-part cured or non-cured vinyl, (meth) acrylic, polyamide, polyester, polyether, polyurethane, epoxy, rubber, etc. An adhesive such as a solvent type, an aqueous type, or an emulsion type can be used. As a two-component curable adhesive, a cured product of a polyol and an isocyanate compound can be used.

  The adhesive resin layer is used when two layers are bonded by a sand lamination method. As the adhesive resin, a polyethylene resin, a polypropylene resin, or a cyclic polyolefin resin, or a copolymer resin, a modified resin, or a mixture (including an alloy) containing these resins as a main component can be used. When the adhesive layer 36 is an adhesive resin layer, it may further include an anchor coat layer made of an anchor coat agent.

  The thickness of the anchor coat layer after drying is 0.1 μm or more and 1 μm or less, preferably 0.3 μm or more and 0.5 μm or less. The thickness of the adhesive layer after drying is 1 μm or more and 10 μm or less, preferably 2 μm or more and 5 μm. The thickness of the adhesive resin layer is 5 μm or more and 50 μm or less, preferably 10 μm or more and 30 μm or less.

(Joint part)
The joining part 40 joins the upper surface 23 of the flange part 22 and the lower surface 32 of the lid | cover 30, and seals the accommodating part 25 of the container 20 from the outside. As shown in FIG. 2, the joint portion 40 is continuously formed over the circumference between the upper surface 23 of the flange portion 22 and the lower surface 32 of the lid 30 so as to surround the storage portion 25 in plan view. The joint portion 40 may be formed by at least partially melting at least one of the container 20 and the lid 30. Moreover, the junction part 40 may be formed of a component separate from the container 20 and the lid 30 such as an adhesive. By forming the joint portion 40 between the lid 30 and the flange portion 22, the storage portion 25 of the container 20 can be sealed from the outside.

  As shown in FIG. 2, the joint portion 40 includes a main line 42 that extends along the flange portion 22, and a protruding line 44 that is disposed on the long side portion 22 a of the flange portion 22 and protrudes inward from the main line 42. ,have. In the example shown in FIG. 2, the main line 42 extends parallel to the inner edge 22 x of the flange portion 22. The protruding line 44 is located inside the above-described concave portion 26 of the flange portion 22. Reference numeral 40 x represents the inner edge of the joint 40, and reference numeral 40 y represents the outer edge of the joint 40.

  In addition, as long as the protrusion line 44 can peel from the flange part 22 earlier than the main line 42 when heating the contents, the specific shape of the protrusion line 44 is not limited.

[Vapor venting mechanism]
When the projecting line 44 is peeled off, a steam hole is formed between the lid 30 and the flange portion 22, and the steam in the storage portion 25 escapes to the outside through the steam hole. Thus, the protruding line 44 is one of the elements that constitute the steam release mechanism 18 for discharging the steam generated in the storage unit 25 to the outside of the storage unit 25.

  The steam release mechanism 18 is preferably provided such that the distance from the protruding line 44 of the steam release mechanism 18 to the center point 25c of the storage portion 25 is shorter than the distance from the main line 42 to the center point 25c. For example, when the outline of the flange portion 22 is substantially rectangular, the protruding line 44 of the flange portion 22 is preferably located in the middle of the long side portion 22a of the flange portion 22 in the direction in which the long side portion 22a extends. Accordingly, the distance between the center point 25c of the storage portion 25 and the inner edge 40x of the protruding line 44 can be set to the shortest distance, thereby causing the protruding line 44 due to pressure generated when the contents are heated. The force acting on the can be further increased.

  The above-described concave portion 26 of the flange portion 22, which is another element constituting the steam release mechanism 18, is located outside the protruding line 44 as shown in FIG. 2. For this reason, compared with the case where the recessed part 26 is not provided, the distance from the outer edge 40y of the protrusion line 44 to the outer edge 22y of the flange part 22 can be shortened. Thereby, after the protruding line 44 is peeled off from the flange portion 22, the steam easily escapes from the outer edge 22 y of the flange portion 22 through the gap between the lid 30 and the flange portion 22.

(Concave)
Hereinafter, the recessed part 26 of the flange part 22 is demonstrated in detail.

  The concave portion 26 of the flange portion 22 is at least partially in contact with the outer edge 40 y of the protruding line 44 of the joint portion 40. In other words, in the horizontal direction, the position of the outer edge 22y of the flange portion 22 in the concave portion 26 and the position of the outer edge 40y of the protruding line 44 of the joint portion 40 are at least partially coincident with each other. Thereby, the precision calculated | required in position alignment of the hot plate with respect to the flange part 22 can be eased in the process of heat-sealing the lid 30 to the flange part 22 using a hot plate, as will be described later. As a result, the time and cost required for the heat sealing step can be reduced. Or the difficulty at the time of manufacturing a container with a lid can be made low. In addition, a part of the recessed part 26 of the flange part 22 is also in contact with the outer edge 40y of the main line 42 extended along the long side part 22a.

  The lid 30 is configured to cover the concave portion 26 of the flange portion 22. However, the present invention is not limited to this, and although not shown, a recess that overlaps the recess 26 of the flange portion 22 may be formed on the outer edge 30 y of the lid 30. In other words, the position of the concave portion 26 of the flange portion 22 may coincide with the position of the outer edge 30y of the portion corresponding to the concave portion 26 of the flange portion 22 of the lid 30.

  Next, the operation of the present embodiment having such a configuration will be described.

  First, the container 20 having the body portion 21 and the flange portion 22 that are integrally formed is manufactured by an injection molding method using a thermoplastic resin such as polypropylene. At this time, the container 20 has taken the outer side position. Subsequently, a part of the outer edge 22 y of the flange portion 22 is cut out to form a recess 26 in the flange portion 22. Thus, the container 20 in which the recessed part 26 is formed in a part of the flange part 22 can be obtained. Note that the mold used in the injection molding may have a shape corresponding to the recess 26. In this case, the process of notching a part of the outer edge 22y of the flange portion 22 is not necessary.

  Next, the trunk portion 21 of the container 20 is bent through the folding lines 21A and 21B, and takes an inner position to enter the inner side of the trunk container 20 (see the solid line in FIG. 3 and FIGS. 6A and 6B). ).

  Here, FIG. 6A is a perspective view showing the lidded container 10 when the body portion 21 takes the inner position, and shows a state in which the contents 1 are removed for convenience, and FIG. It is the perspective view which looked at the container 10 with a lid | cover when the trunk | drum 21 took the inner side position from the bottom face side.

  As shown in FIGS. 3 and 6 (a) and 6 (b), the inner volume of the container 20 is reduced by the trunk portion 21 taking the inner position.

  Subsequently, the storage unit 25 of the container 20 is filled with the content 1. Also, the lid 30 is prepared. Thereafter, the lid 30 is placed on the upper surface of the flange portion 22 of the container 20. Next, a portion of the lid 30 where the joint 40 is to be formed is heated from the upper surface 31 side using a hot plate to melt the sealant layer 35 of the lid 30 and heat-seal the lid 30 to the flange portion 22. To do.

  In this way, the lid 30 is heat-sealed on the flange portion 22, whereby the storage portion 25 of the container 20 is covered with the lid 30, and the lidded container 10 is obtained.

In this state, boiling or retort processing is performed on the lidded container 10.

  Thus, the boiled or retort treatment is performed on the lidded container 10 so that the lidded container 10 is sterilized.

  The lidded container 10 after the sterilization process is then supplied to the market.

  The user puts the lidded container 10 in a microwave oven and heats it with this microwave oven.

  By heating the lidded container 10 with a microwave oven, the moisture in the contents 1 evaporates and the pressure in the storage portion 25 of the container 20 increases. As a result, the container 20 expands in the microwave oven, and the body portion 21 is automatically bent via the bending lines 21A and 21B to take an outer position where it protrudes outward (two points in FIG. 3). (See chain line and FIGS. 7 (a) and 7 (b)).

  Here, FIG. 7A is a perspective view showing the container 10 with the lid when the body portion 21 takes the outer position, and is a view showing a state in which the contents 1 are removed for convenience, and FIG. It is the perspective view which looked at the container 10 with a lid | cover when the trunk | drum 21 took the outer side position from the bottom face.

  Further, when the pressure in the storage unit 25 of the container 20 is increased, the pressure in the storage unit 25 of the container 20 is released to the outside through the steam release mechanism 18.

  As described above, according to the present embodiment, when performing the boil or retort process on the lidded container 10, the inner portion of the container 20 is reduced because the trunk portion 21 takes an inner position where the container 21 enters the container 20. be able to. For this reason, the head space of the container 20 can be reduced. As a result, the time required for the boil or retort processing can be shortened. On the other hand, by heating the lidded container 10 with a microwave oven, the moisture in the contents 1 evaporates and the internal pressure in the container 20 increases. As a result, the body portion 21 is bent in the microwave oven to take an outer position protruding outward from the container 20. As a result, the inner volume of the container 20 can be increased. For this reason, the container 20 can be effectively used as normal tableware.

<Modification of the present invention>
Next, a modification of the lidded container of the present invention will be described with reference to FIGS.

  In the said embodiment, although the circumferential bending line 21A was provided in the side surface 21b of the trunk | drum 21, and the circumferential bending line 21B was provided between the bottom face 21a and the side surface, it was restricted to this. As shown in FIG. 8, the side surface 21b is composed of two bent portions 21b1 and 21b2, and a bent line 21A may be provided between the two portions 21b1 and 21b2.

  In this case, the portion 21b2 is oriented in the vertical direction more than the portion 21b1.

  A circumferential bent line 21B is formed between the bottom surface 21a and the portion 21b1.

  Moreover, in the said embodiment, although the circumferential bending line 21A was provided in the side surface 21b of the trunk | drum 21, and the circumferential bending line 21B was provided between the bottom face 21a and the side surface, it showed to this. As shown in FIG. 9, the side surface 21b includes two portions 21b1 and 21b2 having the same inclination angle, and a step portion 21d between the portions 21b1 and 21b2, and a bent line is formed between the portion 21b1 and the step portion 21d. 21A may be provided.

  In this case, the portions 21b1 and 21b2 are inclined with an equal inclination angle, and the stepped portion 21d extends in the horizontal direction between the portions 21b1 and 21b2.

  A circumferential bent line 21B is formed between the bottom surface 21a and the portion 21b1.

  In addition, although some modified examples with respect to the above-described embodiment have been described, naturally, a plurality of modified examples can be applied in combination as appropriate.

DESCRIPTION OF SYMBOLS 1 Contents 10 Container 18 with a lid | cover Vapor vent mechanism 20 Container 21 Body 21A Bending line 21B Bending line 21a Bottom surface 21b Side surface 21c Raised part 22 Flange part 22a Long side part 22b Short side part 22c Corner part 22d Tab 25 Storage part 26 Recess 30 Lid 40 Joint

Claims (6)

A container including a body part defining a storage part for storing contents, and a flange part connected to an upper part of the body part;
A lid disposed on the upper surface of the flange portion so as to cover the storage portion of the container,
In a cross-sectional view, the body of the container is a container with a lid that can be bent so as to take an inner position that enters the inside of the container and an outer position that protrudes to the outside of the container.   The container with a lid according to claim 1, wherein the trunk portion has a folding line extending in a circumferential shape, and the trunk portion is bent through the folding line when the trunk portion takes an inner position.   The container with a lid according to claim 2, wherein the bent line is formed thinner than other portions of the trunk.   The container with a lid according to claim 1, wherein a central portion of the trunk portion moves in an up-down direction to take an inner position and an outer position.   The container with a lid according to claim 1, wherein the body includes a bottom surface and a side surface. In a container provided with a body part defining a storage part for storing contents, and a flange part connected to the upper part of the body part,
The container is configured such that a body portion of the container can be bent so as to take an inner position that enters the inside of the container and an outer position that protrudes to the outside of the container.

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