JP7359404B2 - packaging containers - Google Patents

Description

TECHNICAL FIELD The present invention relates to a packaging container capable of containing foodstuffs and the like, and particularly suitable for use in a microwave oven.

At retail stores such as convenience stores and supermarkets, bento boxes and side dishes are sold in thin-walled resin containers. Such containers are often designed to have heat resistance so that they can be placed in a microwave oven to heat them easily.

If you heat bento boxes, side dishes, etc. in a microwave oven while they are still in a container, steam will be generated from the food, increasing the internal pressure of the container and causing the lid to blow off. In order to prevent this, for example, the lid is slightly opened to leave a slight gap in the opening, and then the product is placed in a microwave oven to heat it, but this process becomes complicated.

Therefore, a packaging container has been developed in which a U-shaped notch is provided in the lid so that steam can escape without opening the lid.
For example, Patent Document 1 below describes a lid body that covers the opening of the container body, a recess formed in a part of the upper surface of the lid body, and a recess formed in the recess to vent steam generated inside the container body. A valve formed by a notch for the purpose of the invention, a minute steam venting groove formed at the periphery of the recess, and an outer periphery located near the outer end of the steam venting groove, and the entire recess and the steam venting groove. Alternatively, a lunch container is disclosed which has a lid body that is equipped with a label affixed to the lid body that can be covered while leaving a part of the outer periphery. The vapor is pushed up, penetrates into the recess, and is discharged from the recess through a minute steam release groove to the outside.

In Patent Document 2 below, a surface is provided that is inclined with respect to the horizontal direction, and the rotating base is located on the upper side or the lower side of the inclined surface and is formed by a cut made perpendicularly to the horizontal direction. Disclosed is a lid body that forms a sloping valve consisting of a tongue-like part, and when the pressure exceeds a certain pressure, the tongue-like part can smoothly open to discharge steam, or when the pressure is reduced, the tongue-like part can open smoothly to discharge steam. The opening smoothly opens inside the container, allowing air from outside the container to be taken in and preventing the container from collapsing.

Also, a container has been developed in which an exhaust groove is provided at the edge of the container body so that steam inside the container can escape.
For example, Patent Document 3 below discloses that a lid fitting part of a lid body can be forcibly fitted into a container fitting part formed in a container body, and the lid body can be removed from the container body by steam pressure generated inside the container body. A food packaging container is disclosed in which a steam vent groove is formed to allow communication between the inside of the container body and the outside of the container body when the lid is lifted.

Japanese Patent Application Publication No. 2009-28325 Japanese Patent Application Publication No. 2010-195453 Japanese Patent Application Publication No. 2010-215259

Conventional containers have a U-shaped notch valve on the top of the lid and a steam release groove on the edge of the container body to allow steam generated by heating in a microwave oven to be discharged. However, when a large amount of steam is generated, there is a risk that the valves and grooves will not be able to exhaust the gas in time, causing the lid to be pushed up and blown away.

SUMMARY OF THE INVENTION Therefore, it is an object of the present invention to provide a packaging container that allows a large amount of steam to be easily discharged, and which also prevents foreign matter such as dust from entering the inside of the container.

A packaging container according to an embodiment of the present invention includes a container body having a fitting part on the inner surface near the opening, a lid body having a fitted part that fits inside the fitting part, and the container body. A packaging container comprising: a flange portion provided around the fitting portion; and a flange portion and/or a skirt portion provided on the outer edge of the lid body to cover the flange portion of the container body, In a state in which the fitted portions are fitted, a connecting air passage having a gap extending in the circumferential direction of the container is provided between the fitting portion and the fitted portion, intersecting with the connecting air passage, and connecting the connecting air passage to the container. a plurality of exhaust air passages extending vertically from the inside to the outside of the container; the exhaust air passages are formed to narrow from an inlet on the inside of the container to an outlet on the outside of the container; is characterized in that the flange portion of the container body and the flange portion and/or skirt portion of the lid body overlap and close .

In this way, by providing a connecting air passage with a gap extending in the circumferential direction between the fitting part and the fitted part, and by providing a plurality of exhaust air passages that intersect with the connecting air passage, it is possible to The inflowing steam is dispersed by the connecting air passage and can also be discharged from other exhaust air passages. Therefore, even if a large amount of steam is generated inside the container, it is appropriately dispersed and discharged through a plurality of exhaust air passages, and it is possible to prevent the internal pressure of the container from increasing and pushing up the lid.

In the packaging container of the above embodiment, the fitting portion may be provided with a bent line recessed in the circumferential direction of the container, or the fitted portion may be provided with a bent line recessed in the circumferential direction of the container. Thereby, when the lid body is fitted to the container body, the folded line of the fitting part or the fitted part becomes a connecting ventilation passage, and steam can be discharged.

In the packaging container of the above embodiment, a concave portion extending from the inside of the container to the outside of the container can be provided in the fitting portion or the fitted portion to form a discharge ventilation path. Further, it is preferable that the exhaust air passage narrows from the inlet on the inside of the container to the outlet on the outside of the container. By making the discharge air passage a concave portion extending from the inside of the container to the outside of the container, steam can be easily discharged to the outside of the container. Furthermore, by forming the container so that it narrows from the suction port toward the discharge port, the discharge port can be made smaller to make it difficult for foreign matter such as dust to enter the inside of the container.

In the packaging container of the above configuration, a connecting air passage can be provided all around the container. This allows the steam to be dispersed over the entire circumference, making it easier to discharge a large amount of steam.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of an embodiment of the packaging container of the present invention with the lid open. FIG. 2 is a partially enlarged end view of the packaging container shown in FIG. 1 in the vicinity of the opening with the lid open. FIG. 2 is a partially enlarged perspective view of the vicinity of the exhaust air passage in the packaging container shown in FIG. 1 with the lid closed. FIG. 2 is a partially enlarged end view of the packaging container shown in FIG. 1 in the vicinity of the exhaust air passage with the lid closed. FIG. 2 is a partially enlarged end view of the packaging container shown in FIG. 1 in the vicinity of the connecting air passage with the lid closed. FIG. 2 is a partially enlarged end view showing a modified example of the connecting air passage in the packaging container shown in FIG. 1; FIG. 2 is a partially enlarged end view showing another modification of the connecting air passage in the packaging container shown in FIG. 1; FIG. 2 is a partially enlarged end view showing a modified example of the discharge air passage in the packaging container shown in FIG. 1;

Hereinafter, one embodiment of the packaging container of the present invention will be described based on the drawings.

As shown in FIG. 1, a packaging container 1 according to an embodiment of the present invention includes a container body 2 and a lid 3 that can be fitted inside the container body 2.

The packaging container 1 can store foodstuffs such as side dishes, cooked rice, noodles, soups, etc., but is not particularly limited, and is especially suitable for storing bento boxes, side dishes, soups, etc. that can be heated in a microwave. preferable.
Although the packaging container 1 has a circular shape in plan view, it is not limited to this. For example, it may have a square or rectangular shape in plan view, a pentagonal shape, a hexagonal shape, or an octagonal shape in plan view. It can also have a polygonal shape in plan view, an elliptical shape in plan view, etc.

The packaging container 1 can be manufactured, for example, by thermoforming a synthetic resin sheet having a sheet thickness of 0.10 mm to 4.0 mm, preferably 0.15 mm to 2.5 mm.

The synthetic resin sheet is not particularly limited, but may be either a foamed resin sheet or a non-foamed resin sheet, such as a polyolefin resin sheet such as a polyethylene resin sheet or a polypropylene resin sheet, a polystyrene resin sheet, Examples include thermoplastic resin sheets such as polyester resin sheets such as polyethylene terephthalate resin sheets and heat-resistant modified polyethylene terephthalate resin sheets. Among these, those that can withstand heating in a microwave oven, such as heat-resistant polystyrene resin sheets, polypropylene resin sheets, and modified polyethylene terephthalate resin sheets with heat resistance are preferred.
Further, a laminated sheet can also be used as the synthetic resin sheet, and examples of the laminated sheet include a laminated sheet obtained by thermally laminating a film on a synthetic resin sheet, a laminated sheet produced by a coextrusion method, and a laminated sheet produced by an extrusion lamination method. Can be done.

Examples of thermoforming include vacuum forming, pressure forming, vacuum pressure forming, hot plate forming, and the like.

The container body 2 and the lid 3 may be made of the same or different materials; for example, the container body 2 may be made of foamed resin and the lid 3 may be made of non-foamed resin.
Further, the container body 2 and the lid 3 may be colored such as black or white, or may be transparent or translucent. The container body 2 and the lid 3 may be the same or different in color; for example, the container body 2 may be white and the lid 3 may be transparent.

As shown in FIG. 1 or 2, the container main body 2 is formed into an inverted truncated cone shape, and includes a bottom surface portion 21 which is circular in plan view, a side wall surface portion 22 rising from the edge of the bottom surface portion 21, and a side wall surface portion. 22, and a fitting portion 24 provided on the inner surface near the opening 23.

The bottom part 21 is formed as a substantially horizontal plane having a circular shape in plan view, and the side wall part 22 is formed to rise vertically or inclined from the periphery of the bottom part 21, and the area surrounded by the bottom part 21 and the side wall part 22 is It is designed to be able to store food items and other items.

The bottom portion 21 is formed with partition portions 21a and 21b that project upward.
The partition portion 21a is circularly projected near the center of the bottom portion 21, and the partition portions 21b are formed at five locations extending radially from the partition portion 21a at approximately equal intervals.
The inside of the partition part 21a is a circular accommodating part 25a, and each part surrounded by the side wall surface part 22, the partition part 21a, and the partition part 22a is a fan-shaped accommodating part 25b.

As shown in FIG. 2, the side wall surface portion 22 has an inner surface near the opening 23 formed into a substantially vertical surface, and that portion serves as a fitting portion 24 into which the lid 3 is fitted.
The fitting portion 24 has a lower half formed in a substantially vertical plane and an upper half curved inwardly into the container, and the boundary between these is a folded line 26 concave in the circumferential direction of the container. .

A flange portion 27 that projects outward is provided at the upper edge of the side wall surface portion 22 .
The flange portion 27 has a shape in which it projects outward from the upper edge of the side wall surface portion 22 in an upwardly convex semicircular shape, and its tip portion protrudes horizontally with a slight width.

As shown in FIG. 1 or 2, the lid body 3 is formed into a disk shape, and has a top surface portion 31 that is circular in plan view and is fitted into the fitting portion 24 on the outer edge side of the top surface portion 31. and a fitted portion 32 that can be fitted.

The top surface portion 31 is a substantially horizontal surface having a circular shape in plan view, and can cover the opening portion 23 . As shown in FIG. 2, a stepped portion 31a is formed at the outer edge of the top surface portion 31, and is formed to surround the top surface portion 31.
As shown in FIG. 2, the outer side of the stepped portion 31a is formed into a rectangular concave shape, and the outer surface thereof serves as a fitted portion 32 that is internally fitted into the fitting portion 24.

The fitted portion 32 has an approximately vertical upper half formed as a substantially vertical surface, and an approximately lower half formed as an inclined surface protruding inside the container, and the boundary between these is a folded line 33 recessed in the container circumferential direction. .

As shown in FIG. 2, a flange portion 34 projecting horizontally outward is formed on the upper edge of the fitted portion 32 and rests on the flange portion 27 of the container body 2. A skirt portion 35 is provided at the outer edge of the flange portion 34, which is inclined or curved downward and has a distal end projecting horizontally with a slight width. Further, as shown in FIG. 1, a plurality of radially extending convex portions are formed at approximately equal intervals on the upper surface of the flange portion 34, and serve to increase the strength of the flange portion 34.

As shown in FIG. 1, exhaust air passages 4 are provided at appropriate intervals on the outer edge of the lid 3 (near the fitted portion 32 and flange portion 34). In this embodiment, six locations are formed at approximately equal intervals.
As shown in FIG. 3 or 4, the exhaust air passage 4 becomes a passage from the inside of the container to the outside of the container when the lid 3 is fitted to the container body 2, and exhausts steam etc. inside the container to the outside. I have made it possible.
The exhaust air passage 4 is formed by recessing the fitted part 32 and the flange part 34 into a rectangular groove and making them continuous, and as shown in FIG. It has a shape that narrows toward 42. By doing so, the discharge port 42 can be made smaller, making it difficult for foreign matter such as dust to enter the inside of the container.
In this embodiment, the tip of the flange portion 27 of the container body 2 is formed so as to come into contact with the inside of the skirt portion 35 of the lid body 3, so that the discharge port 42 is not exposed to the outside at all times. When discharging steam, the flange portion 27 and skirt portion 35 are pushed apart by the pressure of the steam so that the steam can be discharged.

When the lid 3 is closed to the container body 2, that is, when the fitted portion 32 is fitted into the fitting portion 24, the creases 26 and 33 cause the height to be A gap having a parallelogram-shaped cross section is formed nearby, and this gap serves as a connecting air passage 5 extending in the circumferential direction of the container.
As shown in FIG. 3, the connecting air passage 5 intersects with each exhaust air passage 4, and can disperse steam etc. sucked in from each intake port 41 to other exhaust air passages 4.
In this embodiment, the connecting air passage 5 is provided continuously around the entire circumference in the circumferential direction of the container. Alternatively, at least two exhaust air passages 4 may be connected.

The packaging container 1 stores foodstuffs and the like in storage portions 25a and 25b, covers the opening 23 of the container body 2 with the lid 3, and internally fits the fitting portion 24 and the fitted portion 32. By matching them together, the lid can be closed.
At this time, a connecting air passage 5 and an exhaust air passage 4 are formed between the fitting part 24 and the fitted part 32, as shown in FIG.

When the packaging container 1 containing foodstuffs and the like is placed in a microwave oven and heated with the lid closed, a large amount of steam is generated. The steam inside the container flows from the inlet 41 into the exhaust air passage 4 as shown by the arrow in FIG. The steam flows into the intersecting connecting air passages 5 and is discharged to the outside of the container from the outlet 5 of the other exhaust air passage 4.

In this way, even if a large amount of steam is generated inside the container, the packaging container 1 can be used at certain locations because the steam that has flowed into the exhaust air passage 4 is dispersed to other exhaust air passages 4 by the connecting air passage 5. A large amount of steam can be smoothly discharged without the pressure being concentrated and the lid body 3 being pushed up and scattered.

Furthermore, the discharge port 42 can be made smaller, thereby making it difficult for foreign substances such as dust and insects to enter the inside of the container.

In this embodiment, the connecting air passage 5 is formed by providing the bending lines 26 and 33 in both the fitting part 24 and the fitted part 32, but as shown in FIG. , the connecting air passage 5 may be formed by providing a bend line 33 only on the fitted part 32, or, as shown in FIG. The connecting air passage 5 may be formed by providing the striations 26.

Further, in this embodiment, the exhaust air passage 4 is formed in the fitted part 32 and the flange part 34, but as shown in FIG. It may also be an exhaust air passage 4 extending to . When discharging steam, the pressure of the steam flowing into the exhaust air passage 4 pushes up the flange portion 34 and the skirt portion 35, allowing the steam to be discharged to the outside of the container. As a result, since the discharge port 42 is normally closed by the flange portion 34, it is possible to further prevent foreign matter from entering.

Furthermore, the exhaust air passage 4 may be formed by providing a recessed portion in the fitting portion 24 extending from the inside of the container to the outside of the container. The exhaust air passage 4 may be provided in either the fitting part 24 or the fitted part 32, or may be provided in both. When the exhaust air passage 4 is provided in both the fitting part 24 and the fitted part 32, it is preferable that both the exhaust air passages 4 overlap when the lid 3 is fitted to the container body 2. .

The configuration aspects of the embodiments described above are not listed as limiting the present invention, but can be modified as long as the technical purpose is shared, and the present invention includes such modifications.

1 Packaging container 2 Container body 21 Bottom part 21a, 21b partition part 22 Side wall part 23 Opening part 24 Fitting part 25a, 25b accommodating part 26 Crease 27 Flange part 3 Lid body 31 Top part 31a stepped part 32 Fitting Part 33 Bent line 34 Flange part 35 Skirt part 4 Discharge air passage 41 Inlet 42 Outlet 5 Connected air passage

Claims (6)

A container body having a fitting part on the inner surface near the opening, a lid body having a fitted part that fits inside the fitting part, a flange part provided around the container body, and the lid body. A packaging container comprising a flange portion and/or a skirt portion covering the flange portion of the container body on the outer edge of the packaging container,
In a state where the fitting part and the fitted part are fitted, a connecting air passage having a gap extending in the circumferential direction of the container is provided between the fitting part and the fitting part, and the connecting air passage. a plurality of exhaust ventilation passages intersecting with the container and extending vertically from the inside of the container to the outside of the container;
The discharge air passage is formed so as to narrow from the inlet on the inside of the container to the outlet on the outside of the container, and connects the discharge port with the flange of the container body, the flange of the lid, and/or the skirt. The structure is such that the parts overlap and close.
Packaging containers. The packaging container according to claim 1, wherein the fitting portion is provided with a crease recessed in a circumferential direction of the container. The packaging container according to claim 1 or 2, wherein the fitted portion is provided with a crease recessed in the circumferential direction of the container. 4. The packaging container according to claim 1, wherein the discharge air passage is formed by providing a recess in the fitting portion extending from the inside of the container to the outside of the container. 5. The packaging container according to claim 1, wherein the discharge air passage is formed by providing a recess in the fitted portion extending from the inside of the container to the outside of the container. The packaging container according to any one of claims 1 to 5, wherein the connecting air passage is provided around the entire circumference of the container.

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