Packaging container

Abstract

To provide a packaging container capable of storing a plurality of food materials separately in the vertical direction, easily preventing foreign matters from entering, and easily cooking the food materials with heat in a microwave oven while keeping a lid closed.SOLUTION: In a packaging container, an inner tray fitting part 36 is brought into close contact with the whole periphery of a body fitting part 14; an inner tray bottom surface part 30 has a vapor vent part 35 for discharging vapor in a lower storage part to an upper storage part when heated in a microwave oven; the surface facing the inner tray fitting part 36 in a lid fitting part 63 has a vapor discharge groove 80; a vapor discharge passage for discharging vapor in the upper storage part to the outside of the container during heating in the microwave oven is formed by the inner tray fitting part 36 and the vapor discharge groove 80; and the vertical interval between an inner tray flange upper surface part 50 and a lid flange upper surface part 70 is larger than the vertical interval between a body flange upper surface part 20 and the inner tray flange upper surface part 50.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a packaging container that can accommodate a plurality of food ingredients separated into upper and lower portions and can be heated in a microwave oven with the lid closed. [Background technology]

[0002] The following Patent Document 1 describes a configuration in which a steam exhaust port is provided on the top surface of the lid to exhaust steam generated inside the container when heated in a microwave oven to the outside of the container. However, a configuration in which a steam exhaust port is provided on the top surface of the lid has the risk of foreign objects or insects entering through the steam exhaust port. Therefore, in order to prevent foreign objects from entering through the steam exhaust port, measures such as covering the entire container with plastic wrap when displaying or exhibiting the product are required, which creates a problem of increased costs. In addition, it is necessary to store both soup and ingredients in the main body, and the soup and ingredients cannot be stored separately.

[0003] The following Patent Document 2 describes a container capable of separately storing noodles, rice, and other dishes and ingredients in a main body and an inner plate, in which the inner plate is fitted externally to the main body and a lid is fitted externally to the inner plate. However, when soup is stored in the main body, there is a problem that the soup will leak when the container is tilted. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 9-323743 [Patent Document 2] JP 2020-164205 A Summary of the Invention [Problem to be solved by the invention]

[0005] To provide a packaging container capable of storing a plurality of food ingredients separated into upper and lower portions, easily preventing contamination with foreign matter, and allowing easy heating and cooking in a microwave oven with the lid kept closed. [Means for solving the problem]

[0006] The packaging container according to the present invention is a packaging container comprising a container body, an inner plate that fits into the container body and forms a lower storage section between the container body and the inner plate, and a lid that fits into the inner plate and forms an upper storage section between the inner plate and the lid, the container body comprising a body bottom surface portion, a body fitting portion provided outside the body bottom surface portion, and a body flange portion provided outside the body fitting portion, the body flange portion comprising a body flange upper surface portion that is located at the uppermost position of the body flange portion, and a body flange upper surface portion that is located outside the body flange upper surface portion. The middle plate has a middle plate bottom surface portion, a middle plate fitting portion that is provided outside the middle plate bottom surface portion and fits internally into the body fitting portion, and a middle plate flange portion that is provided outside the middle plate fitting portion, and the middle plate flange portion has a middle plate flange upper surface portion that faces the body flange upper surface portion, and a middle plate edging portion that is provided outside and below the middle plate flange upper surface portion, forms the outer edge of the middle plate, and faces the body edging portion. and a fitting portion for fitting the inner dish fitting portion to the inner dish fitting portion, the lid includes a top surface portion, a lid fitting portion provided outside the top surface portion and fitted internally into the inner dish fitting portion, and a lid flange portion provided outside the lid fitting portion, the lid flange portion having a lid flange upper surface portion facing the upper side of the inner dish flange upper surface portion, and a lid edging portion provided outside and below the lid flange upper surface portion, constituting an outer edge portion of the lid and facing the inner dish edging portion, the inner dish fitting portion being in close contact with the main body fitting portion around the entire circumference, and the inner dish bottom surface portion having a microwave oven cooking device attached thereto. A steam vent is formed to discharge steam from the lower storage section to the upper storage section when heated, a steam exhaust groove is formed on the surface of the lid fitting section facing the middle tray fitting section, and when the container body, middle tray, and lid are combined, the middle tray fitting section and the steam exhaust groove form a steam exhaust passage to discharge steam from the upper storage section to the outside of the container when heated in a microwave oven, and the vertical distance between the middle tray flange top surface and the lid flange top surface is greater than the vertical distance between the main body flange top surface and the middle tray flange top surface. Note that the middle tray flange top surface may abut against the main body flange top surface or may be spaced upward from the main body flange top surface.

[0007] In a packaging container of this configuration, an upper storage section is formed between the container body and the inner plate, and a lower storage section is formed between the inner plate and the lid. That is, the upper storage section and the lower storage section are divided into upper and lower sections by the inner plate. Therefore, different types of ingredients can be stored in the upper storage section and the lower storage section, respectively, and different types of ingredients can be stored in a state separated from each other.

[0008] The inner plate fitting portion is fitted inside the main body fitting portion. The inner plate is maintained attached to the container body by the main body fitting portion and the inner plate fitting portion. The lid fitting portion is fitted inside the inner plate fitting portion. The inner plate fitting portion and the lid fitting portion maintain the lid attached to the inner plate. The main body fitting portion, the inner plate fitting portion, and the lid fitting portion overlap in the inward and outward directions in this order. When the inner plate fitting portion is internally fitted into the main body fitting portion, the inner plate fitting portion is pushed by the main body fitting portion and tries to escape inward. However, since the lid fitting portion is internally fitted into the inner side of the inner plate fitting portion, the inner plate fitting portion is supported from the inside by the lid fitting portion, and the inner plate fitting portion is prevented from deforming inward. Therefore, the inner plate fitting portion is firmly attached to the main body fitting portion, and the fitting state between the main body fitting portion and the inner plate fitting portion is reliably maintained. The inner plate fitting portion is in close contact with the main body fitting portion all around. In other words, a watertight state is ensured between the inner plate fitting portion and the main body fitting portion. Therefore, when the lower storage portion contains liquid such as soup or food with a high moisture content, it is easy to prevent the food contained in the lower storage portion from leaking out of the container, i.e., liquid leakage (juice leakage). A steam vent is formed on the bottom of the inner plate, and liquid leakage from the steam vent is prevented unless the container is tilted significantly.

[0009] Furthermore, the container having the above-mentioned configuration can be placed in a microwave oven with the lid closed, i.e., with the container body, the inner plate, and the lid combined, for cooking. Steam generated in the lower housing section during heating in the microwave oven is discharged from the steam vent at the bottom of the inner plate to the upper housing section. Then, steam in the upper housing section is discharged to the outside of the container from between the lid flange section and the inner plate flange section through a steam discharge passage formed by the steam discharge groove of the lid fitting section and the inner plate fitting section. Since a steam discharge passage is thus formed between the lid fitting section and the inner plate fitting section, there is no need to form a steam vent hole in the top surface of the lid. Therefore, there is no risk of foreign matter entering through the steam vent hole in the top surface of the lid, and the effort of covering the container with plastic wrap is eliminated, making it possible to reduce costs.

[0010] Furthermore, the vertical distance between the upper surface of the inner plate flange and the upper surface of the lid flange is larger than the vertical distance between the upper surface of the main body flange and the upper surface of the inner plate flange. Therefore, when steam is discharged to the outside of the container through the steam discharge passage during microwave heating, the steam can easily pass between the upper surface of the inner plate flange and the upper surface of the lid flange. Therefore, the upper surface of the lid flange is prevented from being locally deformed upwardly due to the pressure of the steam discharged to the outside of the container during microwave heating, and a beautiful appearance can be maintained. On the other hand, the vertical distance between the upper surface of the main body flange and the upper surface of the inner plate flange is relatively small. Therefore, the internal fitting state between the inner plate and the container body is not easily released, and the fitting state between the inner plate fitting part and the main body fitting part can be easily maintained.

[0011] In particular, the vertical distance between the inner plate edging portion and the lid edging portion is preferably smaller than the vertical distance between the inner plate flange upper surface portion and the lid flange upper surface portion. The vertical distance between the inner plate edging portion and the lid edging portion may be 0. That is, the lid edging portion may be configured to abut against the inner plate edging portion. With this configuration, the vertical distance between the inner plate flange upper surface portion and the lid flange upper surface portion can be secured, and steam can be easily discharged to the outside of the container during microwave heating. Moreover, since the vertical distance between the inner plate edging portion and the lid edging portion is relatively narrow, it is easy to prevent foreign matter from entering between the inner plate edging portion and the lid edging portion during display in a store, and further, during microwave heating, the pressure inside the container is unlikely to decrease, and the food in the container can be efficiently heated by high-temperature and high-pressure steam.

[0012] In particular, the container body is preferably made of a foamed resin. When the container body is made of a foamed resin, when hot food, such as soup, is stored in the lower storage section, the heat of the soup is not easily transferred to the hand holding the container body, and the hand does not get hot. On the other hand, when the container body is made of a foamed resin, it is difficult to obtain a fitting force between the container body and the inner plate, and the fitting force is easily reduced by changes over time, compared to when the container body is made of a non-foamed resin. If the dimensions of the inner plate fitting portion are excessively enlarged to excessively expand the fitting margin in an attempt to ensure a large fitting force, it becomes difficult to fit the inner plate inside the container body, and the fitting work takes time or a fitting failure in which the plate does not fit completely is likely to occur. In the above configuration, even if the container body is made of a foamed resin, which is prone to insufficient fitting, the lid fitting portion is further fitted inside the inner plate fitting portion, so that insufficient fitting is unlikely to occur, and the internal fitting state between the main body fitting portion and the inner plate fitting portion is reliably maintained, and the fitting force is prevented from being significantly reduced even when the container body is displayed in a store for a long time. Effect of the Invention

[0013] As described above, multiple ingredients can be stored separately in the upper and lower sections, and liquid leakage can be reliably prevented even when liquid such as soup is stored in the container. In addition, the container can be heated in a microwave oven with the lid closed, and the steam generated during microwave heating can be smoothly discharged to the outside of the container while easily preventing the inclusion of foreign matter, and excessive deformation of the lid flange can be prevented. [Brief description of the drawings]

[0014] [Figure 1] FIG. 2 is a perspective view showing an open state of a packaging container in one embodiment of the present invention. [Diagram 2] FIG. [Diagram 3] FIG. 3 is an enlarged view of the main part of FIG. 2. [Figure 4] FIG. [Diagram 5] 1A is an enlarged plan view of a main portion of the inner plate of the container, and FIG. 1B is an enlarged plan view of a main portion of the lid of the container. [Figure 6] Cross-sectional view taken along line AA in Figure 5(a). [Figure 7] FIG. [Figure 8] FIG. [Figure 9] FIG. 4 is a perspective view of a main part of the lid of the container as viewed from the bottom side. [Figure 10] 8(a) is an enlarged view of the main part of FIG. 8, and FIG. [Figure 11] FIG. [Figure 12] FIG. [Figure 13] Cross-sectional view taken along CC in Figure 12 . [Figure 14] 12. (a) is a DD cross-sectional view of FIG. 12, and (b) is an EE cross-sectional view of FIG. [Figure 15] FIG. 13 is a cross-sectional view corresponding to line DD in FIG. 12, showing the state of the container when heated in a microwave oven. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] A packaging container according to one embodiment of the present invention will be described below with reference to Figs. 1 to 15. The container in this embodiment can accommodate various contents, and the contents are preferably foodstuffs. In particular, the container is suitable for use in storing and selling a plurality of foodstuffs separated into upper and lower portions.

[0016] The container includes a container body 1, a middle plate 2 attached to the container body 1, and a lid 3 attached to the middle plate 2. The middle plate 2 fits inside the container body 1, and the lid 3 fits inside the middle plate 2. As shown in FIG. 11, the middle plate 2 is attached to the container body 1 to form a lower storage section 4, which is a first storage section, between the container body 1 and the middle plate 2, and the lid 3 is attached to the middle plate 2 to form an upper storage section 5, which is a second storage section, between the middle plate 2 and the lid 3. The lower storage section 4 and the upper storage section 5 are partitioned into upper and lower sections by the middle plate 2, and the lower storage section 4 and the upper storage section 5 can store different types of food ingredients. For example, the lower storage section 4 stores soup, etc., and the upper storage section 5 stores noodles, etc. In particular, the lower storage section 4 is suitable for storing liquids such as soup and food ingredients with a high moisture content, since the lower storage section 4 can be sealed by the middle plate 2.

[0017] The container body 1, the inner plate 2, and the lid 3 are all made of synthetic resin sheets. They are formed by various types of thermoforming (sheet forming) such as vacuum forming and compressed air forming. The synthetic resin sheets used for the container body 1, the inner plate 2, and the lid 3 may be of the same type or different types. As the synthetic resin sheets, for example, synthetic resins such as polyethylene terephthalate, polystyrene, polypropylene, polyethylene, and other polyolefins, which have heat resistance that can be used in a microwave oven, can be used. In addition, as the sheet material, a sheet in which inorganic matter is dispersed in the above-mentioned synthetic resin, a foamed sheet in which the above-mentioned synthetic resin is foamed, and even a stretched sheet in which the above-mentioned sheet is stretched can be used. Among these, a heat-resistant expanded styrene-based resin sheet using a heat-resistant styrene-based resin with excellent heat resistance as polystyrene, a sheet in which inorganic matter is dispersed in heat-resistant polypropylene and foamed, and a heat-resistant sheet in which a sheet such as polyethylene terephthalate, polystyrene, polypropylene, or polyethylene is stretched to improve heat resistance can be used.

[0018] In particular, among these sheets, a sheet with excellent transparency is preferable when used for the lid 3, since the food contained in the upper storage section can be visually confirmed. Among these, a stretched sheet obtained by uniaxially or biaxially stretching transparent polyethylene terephthalate, polystyrene, polypropylene, etc. is preferable, since it has the heat resistance required for microwave heating.

[0019] The container body 1 is preferably obtained by thermoforming a sheet using a heat-resistant resin material, and is preferably a foamed resin sheet. The container body 1 is preferably made of a foamed heat-resistant resin material, in particular, in order to be used by heating in a microwave oven. A heat-resistant expanded polystyrene resin sheet is preferable because it is not hot when held by hand when removing it from the microwave oven after heating, burns can be prevented, the electromagnetic waves of the microwave oven can be efficiently transmitted to the food, heating can be performed uniformly and in a short time, and it has excellent heat retention. In addition, the inner plate 2 is preferably made of a sheet with excellent heat resistance because it is directly exposed to steam from heated soup, etc., and is preferably made of a uniaxially or biaxially stretched polypropylene sheet. The lid 3 is preferably made of a polystyrene sheet (OPS).

[0020] The shape of the container in a plan view may be any shape, such as a circle, a polygon, an ellipse, an oval, an oval, or the like, but a circle is particularly preferable from the viewpoint of ensuring easy sealing. In this embodiment, the container has a circular shape in a plan view.

[0021] <Container body 1> 1 to 3, the container body 1 includes a circular body bottom portion 10, a body side portion 11 provided on the outside of the body bottom portion 10, and a body flange portion 12 provided on the outside of the body side portion 11. The body bottom portion 10 may be provided with body legs 13 of various shapes, and in this embodiment, the body legs 13 are annular.

[0022] The main body side portion 11 extends upward from the periphery of the main body bottom portion 10. The main body side portion 11 is provided with a main body fitting portion 14 into which the inner plate 2 fits. The main body fitting portion 14 is provided at the upper end of the main body side portion 11. The main body side portion 11 includes a main body side main portion 15 that extends upward from the periphery of the main body bottom portion 10 while expanding, and occupies most of the total height of the main body side portion 11, a main body extension portion 16 adjacent to the upper side of the main body side main portion 15 and extending outward, a main body fitting portion 14 adjacent to the upper side of the main body extension portion 16, and a main body tapered portion 17 adjacent to the upper side of the main body fitting portion 14. The main body extension portion 16 extends outward and upward from the upper end of the main body side main portion 15 while expanding, but may extend approximately horizontally. The main body tapered portion 17 is provided at the boundary between the main body side portion 11 and the main body flange portion 12. The main body tapered portion 17 is preferably a tapered inclined surface that widens upward.

[0023] The shape of the main body fitting portion 14 may be various. For example, the main body fitting portion 14 may have an inverse tapered shape that is inward toward the upper side, that is, an inverse tapered shape that is narrower toward the upper side. The main body fitting portion 14 may have a vertical shape (straight shape) or a forward tapered shape on the inner surface, and a fitting recess that is recessed toward the outside. In this embodiment, the main body fitting portion 14 has a fitting recess that is recessed toward the outside on the inner surface. The cross-sectional shape of the fitting recess may be various, but is preferably a shape that is curved toward the outside along the vertical direction, and may be an arc shape or a trapezoid shape in a vertical cross section (cross section when cut in the vertical direction).

[0024] An example is shown in an enlarged view in Fig. 3. The main body fitting portion 14 has a main body straight portion 14a that extends substantially vertically (vertically or with a slight reverse taper or slight forward taper) along the up-down direction, and a main body fitting recess 14b that is recessed outward. The main body fitting recess 14b is adjacent to the lower side of the main body straight portion 14a, for example. The cross-sectional shape of the main body fitting recess 14b may be various, but is preferably a shape that is curved outward along the up-down direction.

[0025] The main body flange portion 12 extends outward from the upper end of the main body side portion 11. The main body flange portion 12 is formed around the entire circumference. The shape of the main body flange portion 12 is arbitrary. In this embodiment, the main body flange portion 12 has a main body flange upper surface portion 20 adjacent to the outer side of the main body tapered portion 17 and located at the uppermost position in the main body flange portion 12, and a main body edging portion 21 adjacent to the outer side of the main body flange upper surface portion 20 and located below the main body flange upper surface portion 20. The main body flange upper surface portion 20 is the top portion of the main body flange portion 12. The main body flange upper surface portion 20 is located at the uppermost position in the container body 1. The main body flange upper surface portion 20 has a so-called ball shape, and its upper surface is a curved surface that curves upward in a cross section (longitudinal cross section) when cut in the vertical direction as shown in FIG. 3. In this embodiment, a drinking spout portion 22 with a locally lowered height is formed at a predetermined location of the entire circumference. However, FIG. 3 shows a cross section of a portion other than the mouth 22. The mouth 22 has a concave shape in which the upper surface 20 of the main body flange is locally cut downward. In this embodiment, the mouth 22 is formed at two locations 180 degrees apart, but the number and arrangement of the mouths 22 are arbitrary, and the mouth 22 may not be formed. The body edging 21 constitutes the outer edge of the container body 1 and is located on the outermost side of the container body 1. The body edging 21 extends substantially horizontally from the outer edge of the upper surface 20 of the main body flange toward the outside. When the mouth 22 is formed, the mouth 22 and the body edging 21 are continuous at substantially the same height, or the mouth 22 is located slightly above the body edging 21.

[0026] It is preferable to form many very fine irregularities on the main body edging portion 21, which provides a reinforcing effect and prevents finger cuts. The irregularities are wavy when viewed enlarged from the front, and the direction in which the many peaks and valleys extend is the width direction (inward and outward direction). The irregularities may be formed by knurling, such as flat knurling or twill knurling, and are particularly preferably formed by twill knurling to prevent slipping.

[0027] <Middle plate 2> As shown in Figs. 1, 4, 5(a) and 6, the inner plate 2 includes a circular inner plate bottom surface portion 30, an inner plate side surface portion 31 provided on the outer side of the inner plate bottom surface portion 30, and an inner plate flange portion 32 provided on the outer side of the inner plate side surface portion 31. The shape of the inner plate 2 in a plan view corresponds to that of the container body 1. The inner plate 2 is attached to the container body 1 so as to cover the opening of the container body 1. The inner plate 2 closes the opening of the container body 1. The inner plate 2 is shallower than the container body 1 and is accommodated in the container body 1. The inner plate 2 is entirely inserted into the container body 1, but the inner plate bottom surface portion 30 is spaced upward from the body bottom surface portion 10. The inner plate bottom surface portion 30 is spaced upward from the body bottom surface portion 10 to form a lower accommodation portion 4 between the container body 1 and the inner plate 2.

[0028] The inner plate bottom surface portion 30 is preferably provided with an inner plate leg portion 33 that protrudes downward. The inner plate leg portion 33 may be annular, but in this embodiment, it is island-shaped and multiple inner plate legs 33 are provided at intervals in the circumferential direction. Various ribs may be formed on the inner plate bottom surface portion 30. A continuous rib may be provided from the inner plate bottom surface portion 30 to the inner plate side surface portion 31. In this embodiment, as an example, a circumferential rib 34 that protrudes upward and extends in the circumferential direction is formed on the inner plate bottom surface portion 30. It is preferable that multiple circumferential ribs 34 are formed at intervals in the circumferential direction, and it is also preferable that multiple circumferential ribs 34 are formed at multiple locations spaced apart in the radial direction (inward and outward directions). It is also preferable that the multiple circumferential ribs 34 are arranged in a concentric manner.

[0029] The inner plate bottom surface portion 30 is formed with a steam release portion 35 for releasing steam generated in the lower storage portion 4 during microwave heating to the upper storage portion 5. The steam release portion 35 may have various configurations and arrangements, but in this embodiment, it is made of a curved slit and is provided in the center of the inner plate bottom surface portion 30. The curved slit is, for example, semicircular (C-shaped) and functions as a steam release valve. In this embodiment, the steam release portion 35 is formed in two places 180 degrees apart, but the number and arrangement are arbitrary. The steam release portion 35 is provided on the inner side of the container than the circumferential rib 34. The circumferential rib 34 protrudes higher than the steam release portion 35. Therefore, when food is placed on the inner plate bottom surface portion 30, it is preferable that the food is placed on the circumferential rib 34, and contact between the food and the steam release portion 35 is avoided or reduced. In addition, a bulging portion that bulges upward may be provided on the bottom surface portion 30 of the inner plate, and the bulging portion may be provided with the steam vent portion 35. The steam vent portion 35 may be a slit or, for example, a steam vent hole, and the steam vent hole may be, for example, a hole formed by a laser.

[0030] The middle plate side portion 31 extends from the periphery of the middle plate bottom portion 30 while expanding upward. A middle plate fitting portion 36 is formed at the upper end of the middle plate side portion 31. The middle plate side portion 31 extends from the periphery of the middle plate bottom portion 30 while expanding upward, and includes a middle plate side main portion 37 that occupies a major portion of the total height of the middle plate side portion 31, a middle plate extension portion 38 adjacent to the upper side of the middle plate side main portion 37 and extending outward, a middle plate fitting portion 36 adjacent to the upper side of the middle plate extension portion 38 and extending upward, and a middle plate tapered portion 39 adjacent to the upper side of the middle plate fitting portion 36. It is preferable to provide various ribs on the middle plate side portion 31. When providing ribs on the middle plate side portion 31, the ribs are provided on the middle plate side main portion 37. In particular, it is preferable to provide a vertical rib that extends over the entire length (total height) of the middle plate side main portion 37 in the vertical direction. In addition, in order to prevent the so-called blocking phenomenon in which the inner plates 2 become too tightly fitted together and cannot be removed when a large number of inner plates 2 are stacked one on top of the other, an inner plate protrusion 41 for preventing blocking may be provided on the upper end of the inner plate side main portion 37. The inner plate protrusions 41 are arranged at different positions for each inner plate 2.

[0031] The inner plate extension portion 38 extends outwardly and substantially horizontally from the upper end of the inner plate side main portion 37. The inner plate tapered portion 39 is provided at the boundary between the inner plate side portion 31 and the inner plate flange portion 32. The inner plate tapered portion 39 is preferably a tapered inclined surface that widens upward. The inclination angle of the inner plate tapered portion 39 preferably corresponds to the inclination angle of the main body tapered portion 17, and is preferably equal to or close to the inclination angle of the main body tapered portion 17.

[0032] As shown in FIG. 13, the middle plate fitting portion 36 fits inside the main body fitting portion 14. The shape of the middle plate fitting portion 36 may be various, but is preferably a shape corresponding to the main body fitting portion 14. The middle plate fitting portion 36 may be, for example, an inverse tapered shape that is inward toward the upper side, or may be a vertical or forward tapered shape with a fitting protrusion that protrudes outward. In this embodiment, the middle plate fitting portion 36 is configured to have a fitting protrusion. The cross-sectional shape of the fitting protrusion may be various, for example, a bulging shape that curves outward, such as a circular arc shape in cross section, or a shape that bulges outward into a trapezoidal shape in cross section.

[0033] An example is shown in an enlarged view in FIG. 6. The middle plate fitting portion 36 has a middle plate straight portion 36a extending substantially vertically along the vertical direction and a middle plate fitting convex portion 36b protruding outward. The middle plate fitting convex portion 36b is adjacent to the lower side of the middle plate straight portion 36a, for example. The cross-sectional shape of the middle plate fitting convex portion 36b preferably corresponds to the cross-sectional shape of the main body fitting recess 14b. The cross-sectional shape of the middle plate fitting convex portion 36b may be various, but is preferably a shape curved outward along the vertical direction. Note that, as shown in FIG. 14, the vertical dimension of the middle plate fitting convex portion 36b is preferably smaller than the vertical dimension of the main body fitting recess 14b. In addition, the curvature of the curved shape of the middle plate fitting convex portion 36b along the vertical direction is preferably larger than the curvature of the curved shape of the main body fitting recess 14b along the vertical direction. The amount by which the inner plate fitting convex portion 36b protrudes outward may be approximately the same as the amount by which the main body fitting concave portion 14b recesses outward.

[0034] The middle plate flange portion 32 extends outward from the upper end of the middle plate side portion 31. The middle plate flange portion 32 is formed around the entire circumference. The shape of the middle plate flange portion 32 is arbitrary. In this embodiment, the middle plate flange portion 32 has a middle plate flange upper surface portion 50 adjacent to the outer side of the middle plate taper portion 39 and located at the uppermost position in the middle plate flange portion 32, a middle plate skirt portion 51 adjacent to the outer side of the middle plate flange upper surface portion 50 and extending downward, and a middle plate edging portion 52 adjacent to the outer side of the middle plate skirt portion 51 and located below the middle plate flange upper surface portion 50. The middle plate flange upper surface portion 50 is the top portion of the middle plate flange portion 32. In addition, the middle plate flange upper surface portion 50 is located at the uppermost position in the middle plate 2. It is preferable that the middle plate flange upper surface portion 50 is a horizontal surface extending approximately horizontally. A groove 53 recessed downward (protruding downward) may be formed at a predetermined location of the entire circumference of the middle plate flange upper surface portion 50. The groove 53 crosses the middle plate flange upper surface portion 50 in the inner / outer direction (radial direction). The number and arrangement of the grooves 53 are arbitrary, but in this embodiment, three grooves are provided at two locations opposite each other at 180 degrees. That is, three grooves 53 form one set, and two sets in total are provided at two locations opposite each other at 180 degrees. The amount of protrusion of the grooves 53 downward is, for example, 1 mm or less, and is greater than the sheet thickness of the middle plate 2. The width of the grooves 53 in the circumferential direction is, for example, 1 mm or less. The amount of protrusion of the grooves 53 downward and the width of the grooves 53 in the circumferential direction may be approximately the same.

[0035] The middle plate skirt portion 51 vertically connects the middle plate flange upper surface portion 50 and the middle plate edging portion 52. The middle plate skirt portion 51 extends, for example, obliquely downward while curving outward from the middle plate flange upper surface portion 50. The middle plate edging portion 52 forms the outer edge of the middle plate 2 and is located at the outermost position on the middle plate 2. The middle plate edging portion 52 extends approximately horizontally outward from the outer edge of the middle plate skirt portion 51.

[0036] It is preferable to form a number of extremely fine irregularities on the inner plate edging portion 52, which provides a reinforcing effect and prevents finger cuts. The irregularities are wavy when viewed enlarged from the front, and the direction in which the numerous peaks and valleys extend is the width direction (inward and outward direction). The irregularities may be formed by knurling, such as flat knurling or twill knurling, and are preferably formed by twill knurling to prevent slipping. The inner plate edging portion 52 is preferably larger in diameter than the main body edging portion 21. It is preferable to provide an inner plate gripping portion 54 at a predetermined position on the inner plate edging portion 52. In this embodiment, the inner plate gripping portion 54 is provided at two positions opposite each other at 180 degrees. When the groove 53 is provided on the inner plate flange upper surface portion 50 as described above, the inner plate gripping portion 54 is provided at a position separated from the groove 53 in the circumferential direction.

[0037] <Lid 3> As shown in FIG. 1, FIG. 5(b), and FIG. 7 to FIG. 10, the lid 3 includes a top surface portion 60, a lid side surface portion 61 provided on the outside of the top surface portion 60, a lid extension portion 62 provided on the outside of the lid side surface portion 61, a lid fitting portion 63 provided on the outside of the lid extension portion 62, and a lid flange portion 64 provided on the outside of the lid fitting portion 63. A slip prevention protrusion 65 may be provided on the periphery of the top surface portion 60 to prevent the containers from being misaligned in the lateral direction when the containers are stacked one above the other with their lids closed. The slip prevention protrusion 65 may be, for example, a circumferentially long protrusion, and may be provided in pair at 180 degrees opposite each other. The top surface portion 60 is preferably a flat surface except for the slip prevention protrusion 65.

[0038] The lid side surface portion 61 extends downward from the periphery of the top surface portion 60 while expanding. Various ribs may be formed on the lid side surface portion 61. A vertical rib 74 extending in the vertical direction may be formed on the lid side surface portion 61 corresponding to the region where the anti-slip protrusion 65 is formed, and in particular, the vertical rib 74 may be formed over the entire height of the lid side surface portion 61. A lid protrusion 66 for preventing blocking protruding outward may be provided on the lower end of the lid side surface portion 61 in order to prevent the so-called blocking phenomenon in which the lids 3 are tightly fitted together and cannot be removed when a large number of lids 3 are stacked one on top of the other. The lid protrusion 66 is arranged in a shifted position for each inner plate 2.

[0039] The lid extension portion 62 extends substantially horizontally from the lower end of the lid side surface portion 61 toward the outside. The lid fitting portion 63 extends from the peripheral portion of the lid extension portion 62 toward the upper side. As shown in FIG. 14, the lid fitting portion 63 fits into the inside of the inner plate fitting portion 36. The shape of the lid fitting portion 63 may be various, but is preferably a shape corresponding to the inner plate fitting portion 36. The lid fitting portion 63 may be, for example, an inverse tapered shape that is inward toward the upper side, or a vertical shape or forward tapered shape with a fitting protrusion protruding outward. In this embodiment, the lid fitting portion 63 is configured to have a fitting protrusion. The cross-sectional shape of the fitting protrusion may be various, for example, a bulging shape curved toward the outside, such as a circular arc shape in cross section, or a shape bulging outward into a trapezoidal shape in cross section.

[0040] An example is shown in an enlarged view in FIG. 10. The lid fitting portion 63 has a lid straight portion 63a extending substantially vertically along the vertical direction and a lid fitting convex portion 63b protruding outward. The lid fitting convex portion 63b is adjacent to the lower side of the lid straight portion 63a, for example. The lid straight portion 63a may also be provided on the lower side of the lid fitting convex portion 63b. The cross-sectional shape of the lid fitting convex portion 63b preferably corresponds to the cross-sectional shape of the inner plate fitting convex portion 36b. The cross-sectional shape of the lid fitting convex portion 63b may be various, but is preferably a shape curved outward along the vertical direction. It is preferable that the vertical dimension of the lid fitting convex portion 63b is smaller than the vertical dimension of the inner plate fitting convex portion 36b, as shown in FIG. 14. The vertical dimension of the main body fitting recess 14b, the vertical dimension of the middle plate fitting protrusion 36b, and the vertical dimension of the lid fitting protrusion 63b are preferably smaller in this order. Also, the curvature of the curved shape of the lid fitting protrusion 63b along the vertical direction is preferably larger than the curvature of the curved shape of the middle plate fitting protrusion 36b along the vertical direction. The outward protrusion amount of the lid fitting protrusion 63b may be approximately the same as the outward protrusion amount of the middle plate fitting protrusion 36b.

[0041] A lid tapered portion 67 is preferably provided adjacent to the upper side of the lid fitting portion 63. The lid tapered portion 67 is provided at the boundary between the lid side portion 61 and the lid flange portion 64. The lid tapered portion 67 is preferably a tapered inclined surface that widens upward. The inclination angle of the lid tapered portion 67 preferably corresponds to the inclination angle of the inner plate tapered portion 39, and is preferably equal to or close to the inclination angle of the inner plate tapered portion 39. An inner bend portion 68 that bends inward may be provided at the upper end of the lid tapered portion 67.

[0042] The lid flange portion 64 extends outward from the upper end of the lid tapered portion 67. The lid flange portion 64 is formed around the entire circumference. The shape of the lid flange portion 64 is arbitrary. In this embodiment, the lid flange portion 64 has a lid flange upper surface portion 70 adjacent to the outer side of the lid tapered portion 67 and located at the uppermost position of the lid flange portion 64, a lid skirt portion 71 adjacent to the outer side of the lid flange upper surface portion 70 and extending downward, and a lid edging portion 72 adjacent to the outer side of the lid skirt portion 71 and located below the lid flange upper surface portion 70.

[0043] The lid flange upper surface portion 70 is the top of the lid flange portion 64. In this embodiment, the lid flange upper surface portion 70 is located lower than the top surface portion 60. The lid flange upper surface portion 70 is preferably a horizontal surface extending substantially horizontally. The lid skirt portion 71 vertically connects the lid flange upper surface portion 70 and the lid edging portion 72. The lid skirt portion 71 extends obliquely downward while curving outward from the lid flange upper surface portion 70, for example. The lid edging portion 72 forms the outer edge portion of the lid 3 and is located at the outermost position on the lid 3. The lid edging portion 72 extends substantially horizontally from the outer edge portion of the lid skirt portion 71 toward the outside.

[0044] It is preferable to form many very fine projections and recesses on the lid edging portion 72, which provides a reinforcing effect and prevents finger cuts. The projections and recesses are wavy when viewed enlarged from the front, with the direction in which the many peaks and valleys extend in the width direction (inward and outward directions). The projections and recesses may be formed by knurling, such as flat knurling or twill knurling, and are preferably formed by twill knurling to prevent slipping.

[0045] The lid border 72 is preferably larger in diameter than the main body border 21, and is preferably approximately the same size as the inner plate border 52, i.e., approximately the same diameter. A lid knob 73 is preferably provided at a predetermined location of the lid border 72. In this embodiment, the lid knob 73 is provided at two locations, 180 degrees apart. The inner plate knob 54 and the lid knob 73 are preferably provided at locations corresponding to each other in a plan view, and in the closed lid state, the inner plate knob 54 and the lid knob 73 are preferably overlapped vertically. However, the inner plate knob 54 and the lid knob 73 may be arranged so as to be misaligned in the circumferential direction in a plan view.

[0046] <Steam exhaust groove 80> A steam exhaust groove 80 for exhausting steam from the upper storage section 5 to the outside of the container is formed on the surface (outer surface) of the lid fitting section 63 facing the inner plate fitting section 36. FIG. 5(b) is also an enlarged view of the P section of FIG. 7. FIG. 10(a) shows the steam exhaust groove 80 with a two-dot chain line, and FIG. 10(b) shows the steam exhaust groove 80 with a solid line. The steam exhaust groove 80 is formed over the entire height (overall length in the vertical direction) of the lid fitting section 63. The steam exhaust groove 80 extends to the lid tapered section 67 and to the lid flange upper surface section 70. The steam exhaust groove 80 also extends continuously to the lower surface of the lid extension section 62. The steam exhaust groove 80 is formed over the entire width (overall dimension in the inner and outer directions) of the lid extension section 62. Thus, the steam exhaust groove 80 has a main groove portion 81 which is a first groove portion formed on the outer surface of the lid fitting portion 63, an upper groove portion 82 which is a second groove portion formed on the outer surface of the lid tapered portion 67 and continuous with the main groove portion 81, and a lower groove portion 83 which is a third groove portion formed on the underside of the lid extension portion 62 and continuous with the main groove portion 81. The depth (dimension in the inner and outer directions) of the upper groove portion 82 gradually decreases at its upper end portion, and becomes zero at the inner bend portion 68 of the lid tapered portion 67.

[0047] As shown in Fig. 14, in the closed lid state, a steam exhaust passage 90 is formed between the steam exhaust groove 80 and the inner plate 2. Fig. 14(a) shows the portion of the inner plate 2 other than the recessed groove 53, and Fig. 14(b) shows the portion of the inner plate 2 with the recessed groove 53. The steam exhaust passage 90 is composed of a main passage portion 91 which is a first passage portion, a lower passage portion 92 which is a second passage portion, and an upper passage portion 93 which is a third passage portion. The main passage portion 91 is formed between the main groove portion 81 of the steam exhaust groove 80 and the inner plate fitting portion 36, the lower passage portion 92 is formed between the lower groove portion 82 of the steam exhaust groove 80 and the inner plate extending portion 38, and the upper passage portion 93 is formed between the upper groove portion 83 of the steam exhaust groove 80 and the inner plate tapered portion 39.

[0048] The number and arrangement of the steam exhaust grooves 80 are arbitrary, but it is preferable to provide them in a distributed manner at multiple locations with intervals in the circumferential direction. In this embodiment, the steam exhaust grooves 80 are formed at a total of four locations at 90 degree intervals. The steam exhaust grooves 80 are continuous with the vertical ribs 74 provided on the lid side surface portion 61 at two opposing locations out of the four locations, and are provided at locations where the vertical ribs 74 of the lid side surface portion 61 are not present at the remaining two locations. The vertical ribs 74 of the lid side surface portion 61 are recessed inward. The vertical ribs 74 of the lid side surface portion 61 are formed in the section where the anti-slip projections 65 are formed.

[0049] <Combined state (lid closed state)> There may be various procedures for attaching the inner plate 2 and the lid 3 to the container body 1. For example, the inner plate 2 may be attached to the container body 1, and then the lid 3 may be attached to the inner plate 2. Also, before attaching the inner plate 2 to the container body 1, the lid 3 may be attached to the inner plate 2 in advance, and then the inner plate 2 and the lid 3 may be attached to the container body 1.

[0050] When the inner plate 2 is attached to the container body 1, the opening of the container body 1 is covered by the inner plate 2, and when the lid 3 is attached to the inner plate 2, the opening of the inner plate 2 is covered by the lid 3. The container body 1 and the inner plate 2 define a lower storage section 4, and the inner plate 2 and the lid 3 define an upper storage section 5. Since the lower storage section 4 and the upper storage section 5 are divided into upper and lower sections by the inner plate 2, different types of ingredients can be stored separately in the lower storage section 4 and the upper storage section 5.

[0051] The middle plate fitting portion 36 fits into the inside of the main body fitting portion 14. The middle plate fitting portion 36 fits tightly around the entire circumference of the main body fitting portion 14 in a watertight manner. The middle plate straight portion 36a fits tightly in surface contact with the inside of the main body straight portion 14a in the vertical direction over a predetermined length, and the middle plate fitting protrusion 36b fits tightly into the main body fitting recess 14b in the radial direction. Since the vertical curvature of the middle plate fitting protrusion 36b is larger than the vertical curvature of the main body fitting recess 14b, the middle plate fitting protrusion 36b is in a state close to point contact with the main body fitting recess 14b in a cross-sectional view, and the middle plate fitting protrusion 36b can be tightly fitted into the main body fitting recess 14b, resulting in a large fitting force.

[0052] Furthermore, the lid fitting portion 63 fits inside the middle plate fitting portion 36. The lid straight portion 63a comes into surface contact with the middle plate straight portion 36a over a predetermined length in the up-down direction and adheres closely to it, and the lid fitting convex portion 63b fits into the inner surface of the middle plate fitting convex portion 36b in the radial direction and adheres closely to it. Since the up-down curvature of the lid fitting convex portion 63b is greater than the up-down curvature of the middle plate fitting convex portion 36b, the lid fitting convex portion 63b comes into close to point contact with the middle plate fitting convex portion 36b in cross-sectional view, and the lid fitting convex portion 63b can be tightly adhered to the middle plate fitting convex portion 36b, resulting in a large fitting force.

[0053] In this way, the inner plate fitting portion 36 is in close contact with the inner side of the main body fitting portion 14 around the entire circumference, so that when liquid such as soup or food with a lot of moisture is stored in the lower storage portion 4, leakage of liquid to the outside of the container can be reliably prevented between the main body fitting portion 14 and the inner plate fitting portion 36. Moreover, the lid fitting portion 63 is further fitted to the inner side of the inner plate fitting portion 36. Therefore, the lid fitting portion 63 prevents the inner plate fitting portion 36 from being pushed inward by the main body fitting portion 14 and deforming. In this way, the lid fitting portion 63 supports the inner plate fitting portion 36 from the radially inner side and presses the inner plate fitting portion 36 radially outward, so that the fitted state between the main body fitting portion 14 and the inner plate fitting portion 36 is firmly maintained, and leakage of liquid from the lower storage portion 4 to the outside of the container can be more reliably prevented. In particular, since the curvature of the lid fitting protrusion 63b in the vertical direction is larger than that of the middle plate fitting protrusion 36b in the vertical direction, the lid fitting protrusion 63b strongly supports the middle plate fitting protrusion 36b in a state close to point contact in vertical cross section, and can effectively restrict the inward deformation of the middle plate fitting protrusion 36b. Furthermore, if the middle plate skirt portion 51 abuts against the main body flange upper surface portion 20, even if liquid passes between the main body fitting portion 14 and the middle plate fitting portion 36, it is preferable because the liquid is prevented from leaking out at the abutment point between the middle plate skirt portion 51 and the main body flange upper surface portion 20.

[0054] In addition, when the container body 1 is made of foamed resin, it is particularly effective that the lid fitting portion 63 is fitted inside the inner plate fitting portion 36. Even if the container body 1 is made of foamed resin, the lid fitting portion 63 is further fitted inside the inner plate fitting portion 36, so that insufficient fitting between the main body fitting portion 14 and the inner plate fitting portion 36 is unlikely to occur, and the internal fitting state between the main body fitting portion 14 and the inner plate fitting portion 36 is reliably maintained. In addition, even if the container body 1 is displayed in a store for a long time, the fitting force between the main body fitting portion 14 and the inner plate fitting portion 36 is prevented from significantly decreasing. As a result, it is possible to effectively prevent liquid such as moisture from leaking out of the container from between the main body fitting portion 14 and the inner plate fitting portion 36.

[0055] Further, the middle plate extending portion 38 abuts on or faces the upper side of the main body extending portion 16 with a gap therebetween. The lid extending portion 62 abuts on or faces the upper side of the middle plate extending portion 38 with a gap therebetween. The middle plate tapered portion 39 faces the inside of the main body tapered portion 17, and the lid tapered portion 67 faces the inside of the middle plate tapered portion 39. The upper surface portion 50 of the middle plate flange abuts on or faces the upper side of the upper surface portion 20 of the main body flange with a gap therebetween. The upper surface portion 70 of the lid flange abuts on or faces the upper side of the upper surface portion 50 of the middle plate flange with a gap therebetween.

[0056] In the present embodiment, as shown in FIG. 13, in the portion other than the concave groove 53 of the middle plate 2, the vertical interval between the upper surface portion 20 of the main body flange and the upper surface portion 50 of the middle plate flange is D1. As shown in FIG. 14(b), in the portion of the concave groove 53 of the middle plate 2, the vertical interval between the upper surface portion 20 of the main body flange and the upper surface portion 50 of the middle plate flange is 0. That is, the portion of the concave groove 53 of the middle plate 2 abuts on the upper surface portion 20 of the main body flange. However, the portion of the concave groove 53 of the middle plate 2 may be separated upward from the upper surface portion 20 of the main body flange. Further, as shown in FIG. 13, in the portion other than the concave groove 53 of the middle plate 2, the vertical interval between the upper surface portion 50 of the middle plate flange and the upper surface portion 70 of the lid flange is D2, and there is a relationship of D2 > D1.

[0057] Further, the lower end portion of the middle plate skirt portion 51 abuts on or faces the upper surface portion 20 of the main body flange with a gap therebetween, and the lid skirt portion 71 faces the outside of the middle plate skirt portion 51. The middle plate edge portion 52 faces the upper side of the main body edge portion 21, and the lid edge portion 72 faces the upper side of the middle plate edge portion 52. The vertical interval D3 between the middle plate edge portion 52 and the lid edge portion 72 is smaller than the vertical interval D2 between the upper surface portion 50 of the middle plate flange and the upper surface portion 70 of the lid flange, and there is a relationship of D3 < D2. The vertical interval D3 between the middle plate edge portion 52 and the lid edge portion 72 may be 0.

[0058] As described above, where the steam exhaust groove 80 is formed in the lid 3, a steam exhaust passage 90 is formed between the steam exhaust groove 80 of the lid 3 and the inner plate 2 as shown in Fig. 14. The inner-outer spacing of the steam exhaust passage 90 is preferably greater than the vertical spacing D2 between the lid flange upper surface portion 70 and the inner plate flange upper surface portion 50 at least at the position of the lid fitting portion 63. The vertical spacing D2 between the inner plate flange upper surface portion 50 and the lid flange upper surface portion 70 is preferably smaller than the depth (inner-outer dimension) of the steam exhaust groove 80.

[0059] A steam exhaust passage 90 is formed between the lid 3 and the inner plate 2, and the vertical distance D3 between the inner plate edging portion 52 and the lid edging portion 72 is smaller than the vertical distance D2 between the inner plate flange upper surface portion 50 and the lid flange upper surface portion 70, so that it is easy to prevent foreign matter from entering between the inner plate edging portion 52 and the lid edging portion 72. A narrowed portion 94 that is narrower than the vertical distance D2 between the lid flange upper surface portion 70 and the inner plate flange upper surface portion 50 may be provided between the steam exhaust passage 90 and the space between the lid flange upper surface portion 70 and the inner plate flange upper surface portion 50. When the narrowed portion 94 is provided, steam rising through the steam exhaust passage 90 is temporarily stored in front of the narrowed portion 94 during microwave heating. Therefore, during microwave heating, the pressure inside the container, especially inside the upper storage portion 5, is less likely to decrease, and the food in the upper container can be efficiently heated by high-temperature and high-pressure steam. Furthermore, by providing the narrowed portion 94, even if a foreign object should enter between the lid border portion 72 and the inner plate border portion 52, the probability of the foreign object entering the steam exhaust passage 90 can be reduced.

[0060] The food can be cooked in a microwave oven with the lid closed. When heated in a microwave oven, steam is generated from the food stored in the lower storage section 4. The steam moves to the upper storage section 5 through the steam release section 35 of the inner plate bottom surface section 30. The steam in the upper storage section 5 is discharged to the outside of the container through the steam exhaust passage 90. As steam concentrates in the steam exhaust passage 90, the lid flange section 64 at the location where the steam exhaust passage 90 is formed is locally elastically deformed upward as shown in FIG. 15. Therefore, the steam passing through the steam exhaust passage 90 is smoothly discharged from between the lid border section 72 and the inner plate border section 52. Since the vertical distance D2 between the lid flange upper surface section 70 and the inner plate flange upper surface section 50 is larger than the vertical distance D3 between the lid border section 72 and the inner plate border section 52, the lid flange section 64 can be elastically deformed upward without difficulty during microwave oven heating, and the lid flange section 64 elastically deformed upward is likely to return to its original state after microwave oven heating. Therefore, after microwave heating, lid flange portion 64 is unlikely to remain in a state of localized excessive plastic deformation at steam exhaust passage 90, and a good aesthetic appearance is maintained. If groove 53 is formed in inner plate flange upper surface portion 50 corresponding to steam exhaust passage 90, steam can be exhausted even more smoothly. Even before microwave heating, for example, in situations where the pressure inside the container changes during transportation, the provision of steam exhaust passage 90 makes it possible to prevent inadvertent opening of lid 3. [Explanation of symbols]

[0061] 1 Container body 2 Medium Plates 3 Lid 4 Lower storage section 5 Upper storage section 10 Bottom of the main unit 11 Side of the main body 12 Body flange 13 Body legs 14 Body fitting part 14a Main body straight section 14b Body fitting recess 15 Main body side part 16 Main body extension 17 Tapered part of main body 20 Main body flange upper surface 21 Body edge 22 Drinking mouth 30 Bottom of medium plate 31 Side part of middle plate 32 Center plate flange 33 Middle plate leg 34 Circumferential rib 35 Steam release section 36 Inner plate fitting part 36a Straight part of middle plate 36b Inner plate fitting protrusion 37 Main part of the side of the inner plate 38 Middle plate extension part 39 Tapered part of inner plate 41 Inner plate protrusion 50 Upper surface of inner plate flange 51 Middle plate skirt part 52 Inner plate edge 53 Groove 54 Inner plate knob 60 Top section 61 Lid side part 62 Lid extension 63 Lid fitting part 63a Lid straight section 63b Lid fitting protrusion 64 Lid flange 65 Anti-slip protrusion 66 Lid protrusion 67 Lid tapered part 68 Inner bend 70 Lid flange top 71 Lid skirt 72 Lid edge 73 Lid knob 74 Vertical ribs 80 Steam exhaust ditch 81 Main groove 82 Upper Mizobe 83 Bottom groove 90 Steam exhaust passage 91 Main passage section 92 Lower passage section 93 Upper passage section 94 Squeezing section

Claims

1. A packaging container comprising a container body, an inner plate that fits into the container body and forms a lower storage section between the container body and the inner plate, and a lid that fits into the inner plate and forms an upper storage section between the inner plate and the lid, The container body includes a body bottom portion, a body fitting portion provided outside the body bottom portion, and a body flange portion provided outside the body fitting portion, The main body flange portion has a main body flange upper surface portion located at the uppermost part of the main body flange portion, and a main body edging portion located outside and below the main body flange upper surface portion and constituting an outer edge portion of the container body, The middle plate includes a middle plate bottom surface portion, a middle plate fitting portion provided outside the middle plate bottom surface portion and fitted into the main body fitting portion, and a middle plate flange portion provided outside the middle plate fitting portion, The middle plate flange portion has a middle plate flange upper surface portion that faces the main body flange upper surface portion, and a middle plate edging portion that is provided so as to be located outside and below the middle plate flange upper surface portion, forms an outer edge portion of the middle plate, and faces the main body edging portion; The lid includes a top surface portion, a lid fitting portion provided outside the top surface portion and fitted into the inner tray fitting portion, and a lid flange portion provided outside the lid fitting portion. The lid flange portion has a lid flange upper surface portion facing the upper side of the inner plate flange upper surface portion, and a lid edging portion that is provided so as to be located outside and below the lid flange upper surface portion, forms an outer edge portion of the lid, and faces the inner plate edging portion; The inner plate fitting portion is in close contact with the main body fitting portion all around, A steam vent is formed on the bottom of the middle tray to vent steam from the lower storage section to the upper storage section during microwave heating. A steam exhaust groove is formed on the surface of the lid fitting portion facing the inner plate fitting portion, When the container body, the inner plate, and the lid are combined, a steam exhaust passage is formed by the inner plate fitting portion and the steam exhaust groove, which exhausts steam from the upper storage portion to the outside of the container during microwave heating, and A packaging container, in which the vertical distance between the upper surface of an inner plate flange and the upper surface of a lid flange is greater than the vertical distance between the upper surface of a main body flange and the upper surface of an inner plate flange.

2. 2. The packaging container according to claim 1, wherein the vertical distance between the inner plate border and the lid border is smaller than the vertical distance between the inner plate flange upper surface and the lid flange upper surface.

3. 3. The packaging container according to claim 1, wherein the container body is made of a foamed resin.

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