JP7227587B2 - packaging container - Google Patents

Description

The present invention relates to a packaging container, which is a resin sheet molded product in which a lid is attached to a container body by inner fitting or inner/outer fitting, and which is adapted for microwave ovens so as to discharge water vapor generated when food is reheated. for containers.

There are two types of packaging containers, which are resin sheet moldings: an external fitting type in which the lid is provided with an external fitting portion that fits on the outside of the opening of the container body; There is also an inner fitting type in which an inner fitting portion for fitting is provided. There is also an inner-outer fitting type packaging container that has both an inner fitting portion and an outer fitting portion. In the present application, the inner-fitting type packaging container and the inner-outer fitting type packaging container are collectively referred to as the "inner-fitting type packaging container".

In general, the inner-fitting type packaging container has better sealing performance than the outer-fitting type and is suitable for foods with a lot of juice. Since there is a risk that the lid may come off inadvertently due to an increase in the temperature, microwave oven-compatible packaging containers have been proposed in which the lid is provided with a hole for discharging water vapor (Patent Documents 1 to 7).

JP 2018-47953 A JP 2018-27820 A JP 2018-24476 A JP 2018-20851 A JP 2018-20850 A JP 2017-165485 A JP 2017-81599 A

Among Patent Documents 1 to 7, the entire top plate 51 of the lid 50 is configured with a flat surface, and the top plate 51 is provided with a water vapor exhaust hole 52 (see FIG. 15). Wrapping it will block the vents, and if you put it in the microwave as it is, it will prevent the water vapor from escaping.

On the other hand, when a recess 53 is provided in a part of the top plate 51 and an exhaust hole 52 is provided in this recess 53 (see FIG. 16), even if the entire container is wrapped with a shrink film, the exhaust hole will not be blocked. However, the exhausted water vapor is cooled between the shrink film after heating, becomes condensed water, and accumulates in the concave portion of the top plate. Then, the condensed water accumulated in the recessed portion of the top plate becomes water droplets from the exhaust hole and falls directly on the food in the container body, which impairs the taste of the food.

The present invention was made in order to solve the above-mentioned problems, and its object is to prevent the discharge of water vapor from being prevented even when the container is wrapped with a shrink film, and to prevent condensed water from flowing back into the container. To provide a microwave oven-compatible packaging container having little influence on the taste even as a raw material.

In order to achieve the above object, the present invention provides a microwave ovenable packaging container comprising a lid body and a container body, which are resin sheet moldings, wherein the lid body has an outer peripheral edge of the container body. It has a fitting recess with a concave cross section that fits inside the opening of the container, and the fitting recess is formed with a plurality of through holes at the bottom for discharging the water vapor in the container to the outside. .

According to this means, even if the entire container is wrapped with a shrink film (full shrink packaging) or only the fitting portion of the outer periphery where the lid body and the container body overlap (side shrink packaging) is wrapped with a shrink film, the shrink The through-holes are not blocked by the film, and water vapor can be efficiently discharged even if the film is placed in a microwave oven as it is.

In addition, even if the discharged steam is cooled and the condensed water circulates into the container through the through holes, the condensed water runs down the inner wall surface of the container body and does not directly fall on the food content, so the taste is improved. does not impair

In the present invention, the container body has a bottom surface, a wall surface rising from the periphery of the bottom surface, and an opening at the top of the wall surface, the opening facing outward with respect to the wall surface. A flange portion that forms a gap with the bottom portion of the fitting recess when the fitting recess is fitted from above; The means of providing mating vertical walls is used.

With this means, water vapor in the container is discharged from the through hole through the gap. In addition, the condensed water that enters through the through holes can be prevented from directly falling on the food product by running along the inner surface of the wall surface from the flange portion.

Further, in the present invention, the bottom of the fitting recess is formed by alternately forming a raised bottom portion and a lowered bottom portion having a height difference via an inclined portion having a gradient of flowing water, and at least the lowered bottom portion is provided with a through hole. .

With this means, the condensed water remaining in the fitting recess can be reliably guided to the through hole due to the height difference between the raised bottom portion and the lowered bottom portion. Therefore, when opening the lid, it is possible to avoid getting fingers wet with condensed water remaining in the fitting recess.

The shape of the through hole may be polygonal, elliptical, oval, slotted, or arcuate, but circular is preferred. This is because it is easier to process than other shapes. Also, it is easy to adjust the size of the hole (the diameter of the circle). Methods for processing the through holes include punch processing (trimming processing), laser irradiation processing, needle hole processing, etc. Punch processing is relatively easy, but the present invention does not limit the processing method.

Further, when the through hole is circular, it is preferable to process the through hole so as to have a diameter in the range of 0.5 to 1.2 mm. If the diameter of the micropores is less than 0.5 mm, the water vapor discharge efficiency is poor, and the internal pressure of the container may be excessively increased.

Further, in the present invention, means is used in which the container main body has a recessed groove portion continuous with the wall surface on the peripheral edge of the bottom surface. According to this means, the condensed water running down the wall surface can be stored in the concave groove portion, and it is possible to more reliably prevent the deterioration of the taste of the food.

The present invention is applied to an inner-fitting type packaging container, but it can also be applied to an inner-outer fitting type packaging container having an outer fitting portion on the outer edge of the fitting concave portion. By providing a through hole in the bottom portion of the fitting recess, which is the inner fitting portion, the above-described effects can be obtained.

According to the present invention, since a through hole for discharging water vapor is provided in the bottom of the fitting recess of the lid, even when the container is wrapped with a shrink film, the water vapor is not prevented from being discharged, and condensed water is prevented from entering the container. It was possible to eliminate the influence on the taste even if it was circulated to.

Further, in the present invention, the strength of the lid is not lowered unlike the conventional container having a steam exhaust hole in the top plate of the lid, and the visibility of the contents is high.

1 is an exploded side view of a packaging container according to a first embodiment of the present invention; FIG. Same, exploded sectional view Same, exploded cross-sectional view with enlarged main parts Cross-sectional view of the enlarged main part of the same Plan view of the lid body of the same Same, enlarged plan view of the main part of the lid Enlarged plan view of a main part showing a modification of the through hole Explanatory drawing showing still another modified example of the through hole Explanatory drawing of the lid of the packaging container according to the second embodiment of the present invention Same, (a) AA sectional view of FIG. 9, (b) BB sectional view of FIG. FIG. 4 is an enlarged exploded cross-sectional view of a main part of a packaging container according to a third embodiment of the present invention; Same, cross-sectional view An exploded plan view of a packaging container according to a fourth embodiment of the present invention. Same, cross-sectional view Explanatory drawing of a lid body showing a conventional example Explanatory drawing of a lid showing another conventional example

Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. 1 to 6 show a packaging container according to a first embodiment of the present invention, which basically comprises a container body 1 and a lid 2, as shown in FIG. These members are formed by molding a resin sheet, and a fitting recess 3 having a concave cross-section that fits inside the opening 1a of the container body 1 is formed on the outer peripheral edge of the lid 2. As shown in FIG.

In this embodiment, as shown in FIG. 2, the container body 1 has a bottom surface 4 and a wall surface 5 rising from the periphery of the bottom surface. As shown in FIG. 3, as a fitting opening, a flange portion 6 is formed horizontally outward with respect to the wall surface 5, and a vertical wall 7 is provided by extending upward from the flange portion 6. As shown in FIG. The vertical wall 7 has an inversely tapered shape that is slightly inwardly inclined so that the fitting concave portion 3 of the lid body 2 is tightly fitted. It should be noted that 8 is the final flange extending outwards from the upper edge of the vertical wall 7 .

On the other hand, the lid body 2 includes a top plate 9 and a lid wall 10 formed downward from the top plate 9. The lid wall 10 has a fitting concave portion 3 formed in the peripheral edge of the lower end of the lid wall 10. . As shown in FIG. 3, the fitting recess 3 has a vertical inner wall 11 formed continuously from the lower end of the lid wall 10, a bottom portion 12 formed horizontally outward from the vertical wall 11, and a bottom portion 12 extending from the bottom portion 12. It has an outer wall 13 facing upward. More specifically, the outer wall 13 is formed in a reverse tapered shape corresponding to the vertical wall 7 of the container body 1 , and the depth of the fitting recess 3 is slightly shallower than the height of the vertical wall 7 of the container body 1 . . 4, the outer wall 13 of the fitting recess 3 having such a structure is engaged with the vertical wall 7 of the container body 1 elastically and frictionally, so that the fitting recess 3 is strongly fitted into the opening. At the same time, it enhances the sealing performance. Further, there is a gap C between the bottom portion 12 of the fitting concave portion 3 and the flange portion 6 of the container body 1 and they are fitted together. A final flange 14 extends outward from the upper edge of the outer wall 13, and as shown in FIG.

As a feature of the present invention, a through hole 16 is provided through the bottom portion 12 of the fitting recess 3 . In this embodiment, as shown in FIG. 5, a total of eight through-holes 16 are provided every 45 degrees in the lid body 2 which is circular in plan view.

According to the packaging container having this configuration, when food is contained in the container body 1, the lid 2 is attached by internal fitting, and the shrink film SF is wrapped, the through hole 16 is formed as shown in FIG. It is not closed with the shrink film SF. In this state, when the container is placed in a microwave oven to reheat the food, the steam generated in the container by heating fills the gap C and is discharged out of the container through the through hole 16.例文帳に追加Therefore, the lid 2 is prevented from being unintentionally opened without abnormally increasing the internal pressure in the container.

After that, the shrink film SF is peeled off, the lid body 2 is opened, and the warmed food can be eaten. There is Although the amount depends on the contents of the food and the heating temperature, even if condensed water accumulates in the fitting recess 3, it can be circulated through the through hole 16 into the container. Therefore, there is no inconvenience of getting fingers wet with condensed water when opening the lid body 2 .

Further, the condensed water circulated into the container from the through hole 16 drips onto the flange portion 6 of the container body 1 facing the bottom portion 12 of the fitting recess 3, and then flows along the inner surface of the wall surface 5 of the container body 1 to the bottom surface. It flows down to the 4th side. Therefore, the condensed water accumulated in the fitting recess 3 does not directly fall on the food in the container, and does not affect the taste.

In this embodiment, as shown in FIG. 2, the container body 1 is provided with a recessed groove portion 17 that is continuous with the wall surface 5 on the peripheral edge of the bottom surface 4 . The concave groove portion 17 functions as a leg on the outside, while the concave portion on the inside functions as a reservoir for condensed water that runs along the inner surface of the wall surface 5 described above. Therefore, the condensed water does not come into contact with the food placed on the bottom surface 4, and deterioration of taste can be prevented more reliably.

The size of the through-hole 16 is determined as a minimum requirement for the discharge of water vapor. It should be sized to fit in the In addition, although eight through holes 16 are formed in the present embodiment, the larger the number, the higher the steam discharge capacity. Can not.

As an example in this respect, if the through hole 16 is circular (circular hole), the diameter is set to 0.5 to 1.2 mm. The reason why the minimum diameter is set to 0.5 mm is that if the diameter is less than 0.5 mm, the discharge efficiency of water vapor is poor, and the internal pressure in the container may increase abnormally during heating. In addition, the water permeability of the condensed water is also poor, and the condensed water collected in the fitting recess 3 does not circulate inside the container, and there is a risk that the fingers and the desk will get wet when the lid is opened. On the other hand, the reason why the maximum diameter is set to 1.2 mm is that if the diameter is larger than 1.2 mm, the risk of contamination by foreign matter increases. In addition, the strength of the fitting recess 3 is also affected, and there is a risk that the tight sealing performance will be impaired.

The shape of the through hole 16 is not limited to circular, and may be oval as shown in FIG. 7, for example. In this case, the opening area is larger than in the circular case, but the above-mentioned 0.5 to 1.2 mm can be applied to the dimension of the minor axis 16a.

FIG. 8 shows a list of shapes adopted as the through holes 16, (a) circular, (b) elliptical, (c) circular, (d) regular hexagonal, (e) square, ( f) showing a rectangle; With these shapes, the through hole can be formed relatively easily by punching or the like, but it goes without saying that shapes other than those exemplified here may be used.

Next, a second embodiment of the present invention will be described with reference to FIGS. That is, in this embodiment, the bottom portion 20 has a two-stage structure consisting of a raised bottom portion 21 and a lowered bottom portion 22 . These raised bottom portions 21 and lowered bottom portions 22 are alternately formed via inclined portions 23 having a gradient of flowing water, as shown in FIG. A through hole 16 is formed.

This second embodiment employs the above-described two-stage bottom portion 20 for the purpose of more reliably circulating the condensed water into the container as well as discharging the water vapor. That is, if the bottom is flat over the entire range, the condensed water accumulated in the fitting recess will be in a static state, and only the condensed water near the through hole can be circulated into the container. It is composed of a raised bottom portion 21 and a lowered bottom portion 22 having a height difference, and since these are continuous in a loop shape via an inclined portion 23, condensed water accumulated in the fitting recess smoothly flows to the lower lowered bottom portion 22. , and can be circulated through the through hole 16 into the container.

Although the through hole 16 is provided only in the lowered bottom portion 22 in the second embodiment, by providing the through hole 16 in the raised bottom portion 21 as well, it is possible to enhance the ability to discharge water vapor.

11 and 12 show a third embodiment of the present invention. In this third embodiment, an inner-outer fitting is adopted as a fitting structure between the container body and the lid. That is, the container main body 30 and the lid body 31 are respectively formed with inner fitting portions similar to those of the above-described embodiment, and outer fitting portions 32 and 33 extending downward are formed on the outer edge of each final flange. there is

The outer fitting portions 32 and 33 in this embodiment have reverse tapered surfaces 36 and 37 on the bulging portions 34 and 35 protruding outward, respectively, to achieve strong outer fitting.

Also in this third embodiment, the through hole 16 is formed in the bottom portion 39 of the fitting recess 38, which is the inner fitting portion of the lid 31, to discharge water vapor during heating and to collect condensed water. Circulating inward is common to the first and second embodiments.

Furthermore, as for the shape of the entire container, both the lid 40 and the container main body 41 can be rectangular, as in the fourth embodiment shown in FIGS. By forming a plurality of through holes 16 in the bottom portion 43 of the fitting recess 42 of the lid 40, steam during heating can be discharged and condensed water can be circulated into the container as described in the first to third embodiments. There is nothing to change.

1 Container body 1a Opening 2 Lid 3 Fitting recess 4 Bottom 5 Wall 6 Flange 7 Vertical wall 9 Top plate 10 Lid wall 11 Inner wall 12 Bottom 13 Outer wall 15 Knob 16 Through hole 17 Groove C Gap SF Shrink film

Claims (5)

A microwaveable packaging container comprising a lid body and a container body that are molded resin sheets,
The lid is
Having a fitting recess with a concave cross section that fits inside the opening of the container body on the outer peripheral edge thereof,
In the fitting recess,
Forming a plurality of through holes in the bottom of the container for discharging the water vapor in the container generated by heating with the microwave oven to the outside,
The container body is
a bottom surface;
A wall rising from the perimeter of this bottom,
having an opening in the upper part of the wall surface,
The opening is
a flange portion facing outward with respect to the wall surface and forming a gap with the bottom portion of the fitting recess when the fitting recess of the lid is fitted;
a vertical wall extending upward from the flange portion and having an inner side thereof into which the fitting recess is fitted;
At least the outer peripheral edges of the fitted lid and container body are wrapped with a shrink film,
The water vapor can be discharged from the through hole through the gap,
A packaging container characterized by: The bottom of the fitting recess is
A raised bottom portion and a lowered bottom portion having a height difference are alternately formed via an inclined portion having a gradient of flowing water,
A through hole is provided at least in the lower bottom part,
The packaging container according to claim 1. The through hole is
circular,
The packaging container according to claim 1 or 2. The through hole is
is circular with a diameter of 0.5 to 1.2 mm;
The packaging container according to claim 3. The container body
Having a concave groove part continuous with the wall surface on the periphery of the bottom surface,
The packaging container according to any one of claims 1 to 4.

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