JP6814831B2 - Food packaging container - Google Patents

Description

The present invention relates to a food packaging container capable of heating a contained food in a microwave oven with the lid closed.

For example, Patent Document 1 below describes a configuration in which a steam hole for discharging steam for discharging steam generated inside the container when heated by a microwave oven to the outside of the container is provided on the top surface of the lid. However, in the configuration in which the steam hole is provided on the top surface of the lid, there is a risk that foreign matter may be mixed in or insects may invade through the steam hole. Therefore, in order to prevent foreign matter from entering through the steam holes, it is necessary to take measures such as covering the entire container with a wrap when displaying or displaying the container, which causes a problem that the cost increases.

In Patent Document 2 below, a groove is formed in the upper part of the inner fitting surface of the container body, and a groove is also formed in the lower part of the inner fitting surface of the lid corresponding to the groove of the container body, and heated by a microwave oven. It has been proposed that when the lid is raised by a predetermined amount due to the pressure of time, the groove of the container body and the groove of the lid communicate with each other to form a passage for discharging steam. However, regardless of the orientation of the lid attached to the container body, the groove of the container body and the groove of the lid are in a positional relationship corresponding to the top and bottom, and at least when the lid is raised, they communicate with each other. It is necessary to form a large number of grooves on the inner fitting surface of the container body and the inner fitting surface of the lid, respectively, and there is a problem that the shape of the inner fitting surface becomes complicated and manufacturing is not easy. Furthermore, since a large number of grooves are formed in the upper part of the inner fitting surface of the container body and the lower part of the inner fitting surface of the lid, the accuracy of the inner fitting surface tends to deteriorate, and the inner fitting of each is likely to deteriorate. Since the substantially vertical dimension of the mating surface is shortened, there is a problem that the sealing property is greatly deteriorated and the lid is easily removed, and the lid may be easily removed even when heated by a microwave oven. In addition, the lid does not always rise uniformly over the entire circumference while maintaining the horizontal state when heated by a microwave oven, and on the contrary, the lid may be tilted, and the lid may be twisted against the container body. There is a risk that the steam will not be discharged as expected.

On the other hand, the applicant has already proposed the container described in Patent Document 3 below in order to solve the above problem. In the configuration using the inner plate as described above, the suddenly increased internal pressure does not act on the lid, which is good. On the other hand, if the container body contains jelly-like soup or the like when the inner plate is not used, the internal pressure may rise suddenly due to steam when heated in a microwave oven, and the lid. It turned out that may come off.

In Patent Document 4 below, as shown in FIG. 11, an annular groove 102 is formed on the upper surface of the flange portion 101 of the container body 100 over the entire circumference, and an annular groove 102 is formed on the lower surface of the flange portion 201 of the lid body 200. A container having a protrusion 202 formed therein has been proposed. In this container, it is said that the annular projection 202 of the lid 200 can be fitted into the annular groove 102 of the container body 100 in the closed state to ensure the airtightness. However, if the structure of the annular groove 102 and the annular protrusion 202 is used for a container for a microwave oven, the lid 200 will make a popping sound and the container body will be generated due to a rapid increase in internal pressure during heating by the microwave oven. It will be out of 100. Therefore, it cannot be used in a container for a microwave oven.

Japanese Unexamined Patent Publication No. 9-323743 Japanese Unexamined Patent Publication No. 2014-114063 JP-A-2017-210238 Japanese Unexamined Patent Publication No. 9-20356

INDUSTRIAL APPLICABILITY According to the present invention, it is possible to prevent foreign matter from being mixed in at the time of display without providing a hole for discharging steam on the top surface of the lid, and the steam generated by heating by a microwave oven is smoothly discharged to the outside of the container. It is an object of the present invention to provide a container for food packaging that can prevent the lid from being inadvertently removed during microwave oven heating.

The food packaging container according to the present invention includes a bottom surface portion, a main body side surface portion extending upward from the bottom surface portion and having a fitting surface portion inside the main body, and a main body flange portion provided around the outside of the main body side surface portion. The lid is closed by being located between the container body, the top surface, the lid side surface extending downward from the top surface, the lid flange portion provided around the outside of the lid side surface portion, and the lid side surface portion and the lid flange portion. In the state, the lid is provided with the lid fitting surface portion that is internally fitted to the fitting surface portion inside the main body, and the foreign matter at the time of display is displayed without providing a hole for steam discharge on the top surface portion of the lid body. For food packaging made of synthetic resin , which can prevent mixing and the lid flange, which is softened by the steam generated by heating with a microwave oven, moves while maintaining the inner mating state, so that this steam can be smoothly discharged to the outside of the container . In the container, downward ridges are projected over the entire circumference on the lower surface of the lid flange portion, and at least one concave groove for communication is formed on the outer surface of the fitting surface portion inside the lid. In the closed state, the lid flange portion is elastically deformed, so that the downward ridge of the lid flange abuts on the entire circumference of the upper surface of the main body flange portion, and the lid flange portion located outside the downward ridge. The outer annular portion is separated upward from the upper surface of the main body flange portion, and an annular outer separating space portion is formed between the outer annular portion of the lid flange portion and the main body flange portion, and the outer annular portion is separated from the downward ridge. The inner annular portion of the lid flange portion located on the inner side is separated upward from the upper surface of the main body flange portion, and an annular inner annular space portion is provided between the inner annular portion of the lid flange portion and the main body flange portion. The inner space of the container is formed and communicates with the inner separated space portion through the communication concave groove.

This food packaging container has a configuration in which a lid is internally fitted to the container body. The internal space of the container is defined by the container body and the lid in the closed state. The internal space of the container communicates with the inner separated space through the communication concave groove, but since the downward ridge of the lid flange is in contact with the entire upper surface of the main body flange, it is outside. The communication between the separated space and the inner separated space is blocked by the downward ridge. Since the annular downward ridge of the lid flange is in contact with the upper surface of the main body flange in this way, the internal space of the container is blocked from the outside, and foreign matter is prevented from entering the internal space of the container. Will be done. On the other hand, by putting the container in the microwave oven with the lid closed, the food contained in the container can be cooked. The steam generated from the food during microwave oven heating reaches the inner separated space from the inner space of the container through the recessed groove for communication. The inner separation space is annular and is located immediately inside the downward ridge. That is, the steam reaches just inside the downward ridge over the entire circumference. Since the downward ridges are in contact with the upper surface of the main body flange portion over the entire circumference, the steam that has reached the inner separated space is once blocked from being discharged to the outside by the downward ridges. Further, when the steam reaches the inner separated space portion, the lid flange portion is heated by the steam, and the synthetic resin constituting the lid body is softened. After that, when the pressure in the internal space of the container is increased by microwave oven heating, the pressure reaches the inner separated space portion from the communication concave groove and pushes up the lid flange portion upward. As described above, the lid flange portion is softened by the steam that has already reached the inner separating space portion, and both the inner annular portion and the outer annular portion are separated upward from the main body flange portion. The lid flange can be easily lifted upward by increasing the internal pressure. Then, as the lid flange portion moves upward, at least a part of the entire circumference of the downward ridge rises from the upper surface of the main body flange portion, and a gap is formed between the downward ridge and the upper surface of the main body flange portion. Will be done. The steam that has reached the inner separation space flows to the outer separation space through the gap formed between the downward ridge and the upper surface of the main body flange, and is discharged to the outside of the container from the outer separation space. Will be done. Therefore, before the internal pressure rises to the extent that the lid comes off, the softened lid flange moves and steam can be discharged to the outside, and the lid carelessly comes off the container body or bursts in the microwave. It is possible to prevent the lid from flying with the occurrence of.

In particular, the side surface portion of the main body is provided with a stepped portion of the main body between the side surface portion of the main body and the fitting surface portion inside the main body, and the lid body is provided with a extending portion of the lid between the side surface portion of the lid and the fitting surface portion inside the lid. In the above case, it is preferable that the lid extending portion is separated from the main body step portion over the entire circumference without contacting the main body step portion in the closed state. According to this configuration, since the lid extending portion is separated upward from the main body step portion over the entire circumference in the closed state, the steam generated during microwave oven heating is between the main body step portion and the lid extending portion. It will flow smoothly from the annular gap of the ring to the recessed groove for communication.

As described above, in the closed state, the downward ridge abuts on the upper surface of the main body flange portion over the entire circumference to block the inner space and the outside of the container, and the inside of the downward ridge is an annular inner space. Since a separation portion is formed and an annular outer separation space portion is formed on the outside of the downward ridge, it is possible to prevent foreign matter from being mixed in during display and display, and excessive steam generated during heating by a microwave oven. Steam can be smoothly discharged to the outside of the container before the internal pressure rises. Further, steam can be smoothly discharged to the outside without providing a steam vent hole or the like on the top surface of the lid.

The perspective view which shows the opened state of the container for food packaging in one Embodiment of this invention. A perspective view of the main part of the lid of the container as viewed from the bottom side. Bottom view of the lid of the container. Enlarged view of the main part of FIG. Front view of the main part of the lid. The end view of the main part which shows the opened state of the container. The end view of the main part which shows the closed state of the container. Enlarged view of the main part of FIG. Enlarged end view of the main part showing the closed state of the container. An enlarged end view of a main part showing a state when the container is heated in a microwave oven. It is an end view which shows the main part of the conventional container, (a) shows the lid open state, (b) shows the lid closed state.

Hereinafter, a container for food packaging made of synthetic resin according to an embodiment of the present invention will be described with reference to FIGS. 1 to 10. Various foods (foodstuffs) can be stored in the container, and it is particularly suitable for the purpose of cooking the foods contained in the container in a microwave oven with the lid closed.

As shown in FIG. 1, the container includes a container body 1 and a lid 2. Both the container body 1 and the lid 2 are made of a synthetic resin sheet. The container body 1 and the lid 2 are formed by various thermoforming (sheet molding) such as vacuum forming and compressed air forming. Examples of synthetic resin sheets include various synthetic resin sheets such as polyethylene terephthalate, polystyrene, polyolefins such as polypropylene and polyethylene, sheets filled with inorganic substances as these sheet materials, and stretched sheets obtained by stretching these sheets. Can be used. For example, a sheet in which polypropylene having excellent heat resistance is filled with an inorganic substance, or 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. A resin film may be laminated on one side or both sides of these sheets. It is also preferable to use a sheet having excellent transparency, and it is particularly preferable for the lid 2. When used in a microwave oven, a heat-resistant sheet is used so that it can withstand heating by the microwave oven. The thickness of the sheet is, for example, 0.1 to 1 mm. It is particularly preferable to use a foamed heat-resistant sheet for the container body 1, which is not hot to hold when taken out of the microwave oven after heating, can suppress burns, etc., and efficiently accommodates electromagnetic waves in the microwave oven. It can be transmitted to foodstuffs and heated uniformly and in a short time.

By attaching the lid 2 to the container body 1, an internal space 3 (see FIG. 7) is formed between the container body 1 and the lid 2, and various foods are stored in the internal space 3. Can be done. Suitable for storing foods containing water or liquid, especially foods containing a large amount of water or liquid. The food is preferably microwave-heated and eaten. For example, in the case of noodles, soup stock and soup can be added together with the noodles and ingredients. The soup stock and soup are preferably jelly-like soups hardened with gelatin, and are melted and liquefied by heating in a microwave oven. Jelly-like soup, noodles, sardines, and the like can be stored in the container body 1 in advance. For example, a jelly-like soup can be stored in the container body 1, and noodles and ingredients can be stored on the container body 1.

The shape of the container in a plan view is arbitrary, and may be a substantially polygonal shape, a substantially elliptical shape, a substantially oval shape, a substantially oval shape, or the like, in addition to a substantially circular shape, but is preferably a substantially circular shape. In the case of a substantially polygonal shape, each side portion may be linear or may be configured to bulge outward in an arc shape. Each corner may be arcuate, i.e. rounded. Hereinafter, as a typical example, a container having a substantially circular shape in a plan view will be described.

<Container body 1>
As shown in FIGS. 1 and 6, the container main body 1 is a bowl-shaped one having an upper surface opening, and includes a bottom surface portion 10, a main body side surface portion 11, and a main body flange portion 12. The bottom surface portion 10 has a substantially circular shape in a plan view, and legs (not shown) having various shapes may be provided on the lower surface thereof. The side surface portion 11 of the main body is cylindrical as a whole, and extends upward from the peripheral edge of the bottom surface portion 10 while expanding as a whole. The main body side surface portion 11 includes a side surface main portion 13, a main body step portion 14, and an in-main body fitting surface portion 15. The side surface main portion 13 occupies most of the main body side surface portion 11, and extends upward from the peripheral edge of the bottom surface portion 10. The main body step portion 14 extends from the upper end of the side surface main portion 13 to the outside. The upper surface of the stepped portion 14 of the main body may extend substantially horizontally toward the outside, but it is preferable that the upper surface of the stepped portion 14 extends diagonally upward toward the outside as in the present embodiment.

The fitting surface portion 15 in the main body extends from the outer edge of the stepped portion 14 of the main body toward the upper side. The fitting surface portion 15 in the main body is formed over the entire circumference. The fitting surface portion 15 in the main body is located at the uppermost portion of the side surface portion 11 of the main body, and is located at the opening edge portion of the container main body 1. The lid 2 is internally fitted into the container body 1. At that time, the inner surface (inner peripheral surface) of the fitting surface portion 15 inside the main body becomes the fitting surface between the container main body 1 and the lid body 2. The shape of the inner surface of the fitting surface portion 15 in the main body may be various. In the present embodiment, the inner surface of the fitting surface portion 15 in the main body has an annular groove 16 recessed toward the outside. In particular, it is preferable that the annular groove 16 is provided in the lower part of the inner surface of the fitting surface portion 15 in the main body. The shape of the annular groove 16 in cross-sectional view is arbitrary, but is preferably arcuate. The upper part of the inner surface of the fitting surface portion 15 in the main body has a shape extending substantially vertically. However, the inner surface of the fitting surface portion 15 in the main body may have a reverse taper shape in which the diameter is gradually reduced, for example, upward.

The main body flange portion 12 extends outward from the upper end of the fitting surface portion 15 in the main body. The main body flange portion 12 is formed on the outer side of the opening edge portion of the container main body 1 over the entire circumference. Therefore, the main body flange portion 12 is an annular shape having a substantially circular shape in a plan view. The upper surface of the main body flange portion 12 may have a bead shape. As described above, the upper surface of the main body flange portion 12 may be a curved surface curved upward along the inward and outward directions, or may be a horizontal plane. A concave groove 17 recessed upward may be formed on the lower surface of the main body flange portion 12 over the entire circumference. By forming the concave groove 17 on the lower surface of the main body flange portion 12 in this way, the upper surface of the main body flange portion 12 can be easily projected upward in an arc shape to form a bead shape. Reinforcing ribs (not shown) extending in the inward and outward directions may be formed at a predetermined portion of the concave groove 17 so that the recessing depth is shallower than that of other portions. The wall thickness of the portion where the reinforcing rib is formed becomes thicker than that of the other portions, and the strength of the main body flange portion 12 can be improved.

It is preferable to form a main body edging portion 18 extending outward, for example, substantially horizontally, over the entire circumference of the peripheral edge portion of the main body flange portion 12. When the main body edging portion 18 is provided around the main body flange portion 12 in this way, the outer edge of the main body edging portion 18 becomes the outer edge of the container main body 1 and is the outermost portion in a plan view. The main body edging portion 18 is thinner than the other portions of the main body flange portion 12. When a foamed sheet is used as the synthetic resin sheet constituting the container body 1, the foamed sheet is locally strongly pressed in the thickness direction during thermoforming to compress the body edging portion 18 to the main body. It can be formed to be relatively thinner than the other portions of the flange portion 12. In this way, the main body flange portion 12 can be reinforced by providing the main body edging portion 18 on the outer edge portion of the main body flange portion 12 over the entire circumference. The width of the main body edging portion 18 may be as thin as, for example, about 0.1 mm to 2 mm. Further, the upper surface of the main body edging portion 18 may be subjected to fine unevenness processing or embossing at the same time as thermoforming when forming the container main body 1 to form an uneven shape. Although not shown, a main body knob portion may be provided on the outer edge of the main body flange portion 12.

<Lid body 2>
The details of the lid are shown in FIGS. 2 to 5. The lid body 2 includes a top surface portion 20, a lid side surface portion 21, a connecting portion 22, and a lid flange portion 23. Since the lid 2 closes the opening on the upper surface of the container body 1, the shape of the lid 2 in a plan view corresponds to that of the container body 1. Therefore, the lid body 2 is substantially circular in a plan view like the container body 1. The top surface portion 20 is substantially circular in a plan view. The top surface portion 20 may be a flat surface having no unevenness over the entire surface, but a convex portion 24 for preventing misalignment to prevent horizontal misalignment between the containers when the containers are stacked one above the other is provided. It may be formed on the peripheral edge. Although the height of the top surface portion 20 is formed higher than that of the lid flange portion 23, it may be substantially the same as that of the lid flange portion 23 or may be lower than that of the lid flange portion 23.

The lid side surface portion 21 has a cylindrical shape and extends downward from the peripheral edge of the top surface portion 20 while expanding downward. A connecting portion 22 is formed on the outside of the lower end of the lid side surface portion 21. The connecting portion 22 connects the lid side surface portion 21 and the lid flange portion 23. The structure of the connecting portion 22 may be various, but at least it has an in-lid fitting surface portion 28. In the present embodiment, the connecting portion 22 has a lid extending portion 27 and an in-lid fitting surface portion 28, and more specifically, the connecting portion 22 includes a lid step portion 25, a lid step lower portion 26, and a lid. It has an extending portion 27, an in-lid fitting surface portion 28, and a chamfered portion 29. The lid step portion 25 extends substantially horizontally from the lower end of the lid side surface portion 21 toward the outside. The lid step lower portion 26 extends downward from the outer edge of the lid step portion 25. The lid extending portion 27 extends substantially horizontally from the lower end of the lid step lower portion 26 toward the outside. The inner lid fitting surface portion 28 extends upward from the outer edge of the lid extending portion 27. The lid extending portion 27 is the lowest portion in the lid body 2.

The outer surface of the inner lid fitting surface portion 28 corresponds to the inner surface of the inner fitting surface portion 15 of the main body, and in the present embodiment, the outer surface of the inner lid fitting surface portion 28 locally protrudes outward from the lower portion thereof. An annular ridge 30 is provided, and the upper portion of the outer surface of the fitting surface portion 28 inside the lid extends substantially vertically. The annular ridge 30 can be engaged with the annular groove 16 of the container body 1. Therefore, the shape of the annular ridge 30 in cross-sectional view is preferably one that corresponds to the annular concave groove 16 of the container body 1, for example, an arc-shaped cross-sectional view. The chamfered portion 29 is located at a boundary portion between the fitting surface portion 28 in the lid and the lid flange portion 23. The chamfered portion 29 connects the upper end of the lid inner fitting surface portion 28 and the inner edge of the lid flange portion 23. The chamfered portion 29 can be a tapered inclined surface that expands upward. By providing the chamfered portion 29, the lid body 2 can be smoothly internally fitted to the container body 1.

The lid flange portion 23 is provided around the outside of the connecting portion 22, and in the present embodiment, the lid flange portion 23 is formed on the outside of the chamfered portion 29 over the entire circumference. The shape of the lid flange portion 23 may be various, but it is preferable that the lid flange portion 23 has a shape extending substantially horizontally toward the outside as in the present embodiment. A downward ridge 31 projects downward from the lower surface of the lid flange portion 23. The downward ridge 31 is formed over the entire circumference, and therefore the downward ridge 31 is annular. The cross-sectional shape of the downward ridge 31 is arbitrary, but is preferably a substantially semicircular cross-sectional view. An annular groove 32 is formed on the upper surface of the lid flange portion 23 corresponding to the downward ridge 31. By forming the downward ridge 31 on the lower surface of the lid flange portion 23 in this way, the lid flange portion 23 has the inner annular portion 33, which is an annular portion inside the downward ridge 31, and the downward ridge 31. It is partitioned into an outer annular portion 34, which is an outer annular portion. That is, the inner annular portion 33 is a region from the inner edge of the lid flange portion 23 to the downward ridge 31, and the outer annular portion 34 is a region from the outer edge of the lid flange portion 23 to the downward ridge 31. The inner annular portion 33 and the outer annular portion 34 are both substantially horizontal.

As shown in FIG. 6, in the container main body 1, the vertical separation distance H1 between the top portion 12a of the upper surface of the main body flange portion 12 and the annular concave groove 16 and the downward ridge 31 and the annular ridge 30 in the lid 2 Comparing with the separation distance H2 in the vertical direction between the two, the separation distance H1 is substantially equal to or slightly larger than the separation distance H2. If the separation distance H1 is slightly larger than the separation distance H2, the downward ridge 31 will surely and strongly abut the upper surface of the main body flange portion 12 in the closed state. By adjusting the magnitude relationship between the separation distance H1 and the separation distance H2, the strength of the downward ridge 31 in contact with the upper surface of the main body flange portion 12 can be adjusted. When the downward ridge 31 comes into contact with the upper surface of the main body flange portion 12, the lid flange portion 23 can be elastically deformed by the elastic force of the sheet, and when the sheet of the container main body 1 is a foam sheet, its cushioning property. As a result, the upper surface of the main body flange portion 12 can be slightly compressed and deformed downward. The separation distance H1 is based on the deepest part of the annular groove 16. The separation distance H2 is based on the most protruding portion of the annular ridge 30.

It is preferable to provide the lid knob portion 35 at a predetermined portion on the entire circumference of the lid flange portion 23. The lid picking portion 35 is a portion of the outer edge of the lid flange portion 23 that locally bulges outward, and the shape and size thereof are arbitrary and can be picked with a fingertip. It should be. The lid picking portion 35 may have a substantially triangular shape or a tongue piece shape, for example.

As described above, it is preferable to form a large number of ultrafine irregularities on the outer annular portion 34 of the lid flange portion 23, which provides a reinforcing effect and prevents finger cuts. This unevenness has a wavy shape when viewed magnified from the front, and it is preferable that the extending direction of many peaks and valley bottoms is the radial direction. Further, the unevenness may be formed by knurled eyes such as flatfish knurled eyes and twill knurled eyes, and particularly preferably formed by knurled eyes to prevent slipping. It is preferable to provide knurled eyes on the lid picking portion 35.

<Concave groove 40 for communication>
On the outer surface of the fitting surface portion 28 inside the lid, a recessed groove 40 for communication is formed which is recessed inward. The communication recessed groove 40 is formed over the entire height of the outer surface of the inner lid fitting surface portion 28. The communication recessed groove 40 reaches the lid flange portion 23. Therefore, the communication recessed groove 40 is continuously formed in the inner lid fitting surface portion 28 and the chamfered portion 29. The communication recessed groove 40 preferably extends in the vertical direction, but may extend in an oblique direction, for example.

The communication recessed groove 40 extends continuously to the lower surface of the lid extending portion 27. The communication recessed groove 40 is formed over the entire length of the lid extending portion 27 in the inner and outer directions, and preferably extends linearly in the radial direction. As described above, the communication recessed groove 40 is formed in an L shape as a whole in the vertical cross-sectional view in which the lid body 2 is cut in the vertical direction, and is formed on the outer surfaces of the inner lid fitting surface portion 28 and the chamfered portion 29. It is composed of a vertical groove portion 41 extending in the vertical direction and a horizontal groove portion 42 formed on the lower surface of the lid extending portion 27 extending in the inward and outward directions. The vertical groove portion 41 and the horizontal groove portion 42 are continuous with each other. In FIG. 8, the vertical cross-sectional shape of the communication recessed groove 40 is shown by a two-dot chain line. In the present embodiment, the communication recessed groove 40 is formed so as to extend in the inward and outward directions over the entire width of the lower surface of the lid extending portion 27, but reaches the inner edge of the lower surface of the lid extending portion 27. It does not have to be. The number and arrangement of the communication recessed grooves 40 may be set according to the food to be accommodated, and in the case of food having a large amount of water, it is preferable that the recessed grooves 40 are evenly distributed at a plurality of locations. In the present embodiment, it is formed at a total of four places at 90 degree intervals, but for example, it may be formed at two places facing each other at 180 degrees, or formed at three places at 120 degree intervals, and it may be set according to the food to be contained. Just do it. Further, the horizontal groove portion 42 may be omitted and only the vertical groove portion 41 may be configured.

It is preferable that the container body 1 and the lid 2 are provided with a convex portion for preventing blocking (not shown) for preventing blocking when the members are stacked.

<Closed state>
FIG. 6 shows the lid open state, and FIG. 7 shows the lid closed state. Further, FIGS. 8 to 10 show enlarged main parts of the container in the closed lid state. FIG. 8 is an enlarged view of a main part of FIG. 7, and is a cross-sectional view of a portion where the communication recessed groove 40 is not formed. 9 and 10 are cross-sectional views at the position of the communication recessed groove 40. First, food is stored in the container body 1, and then the lid 2 is attached to the container body 1. By internally fitting the lid 2 to the container body 1, the container is closed. Since the lid 2 is internally fitted to the container body 1, it is possible to prevent the lid 2 from being inadvertently removed. Further, by storing the soup as a jelly, it is possible to effectively prevent the soup from leaking, and it becomes liquid by microwave oven heating, so that the liquid soup can be eaten. Further, since the top surface portion 20 of the lid 2 is not formed with holes or the like for discharging steam, there is no risk of foreign matter being mixed in through the holes or the like for discharging steam. Further, it is not necessary to attach a separate sealing seal or the like to the steam discharge hole or the like, and the manufacturing cost can be reduced.

When the lid 2 is internally fitted to the container body 1, the lid 2 is pushed from above to fit the inner lid fitting surface 28 to the inside of the inner fitting surface 15. When the annular ridge 30 of the lid 2 engages with the annular groove 16 of the container body 1, a feeling of wearing is transmitted to the hand pushing the lid 2 downward, and the operator can feel the wearing feeling by the feeling of wearing the lid. It can be known that the annular ridge 30 of 2 is engaged with the annular groove 16 of the container body 1. Therefore, the operator may push the lid 2 downward until the annular ridge 30 of the lid 2 engages with the annular groove 16 of the container body 1. Then, when the annular ridge 30 of the lid 2 engages with the annular groove 16 of the container body 1, the downward ridge 31 of the lid 2 comes into contact with the upper surface of the main body flange portion 12.

Further, in the closed state, the lid extending portion 27 is located corresponding to the upper side of the main body step portion 14 as shown in FIG. The lid extending portion 27 is separated from the main body step portion 14 upward without being in contact with the main body step portion 14. Therefore, a gap is formed over the entire circumference between the lid extending portion 27 and the main body step portion 14. In particular, when the main body step portion 14 is inclined obliquely upward toward the outside, the gap between the lid extending portion 27 and the main body step portion 14 gradually narrows from the inside to the outside. The outer surface of the lid inner fitting surface portion 28 abuts on the inner surface of the main body fitting surface portion 15 over the entire circumference. The annular ridge 30 of the fitting surface portion 28 in the lid engages with the annular concave groove 16 of the fitting surface portion 15 in the main body over the entire circumference. The chamfered portion 29 of the lid 2 abuts on the inner portion of the upper surface of the main body flange portion 12 over the entire circumference, but may be partially or separated over the entire circumference.

In the lid flange portion 23, only the downward ridge 31 abuts on the upper surface of the main body flange portion 12. The downward ridge 31 abuts on the top 12a of the upper surface of the main body flange portion 12. The inner annular portion 33 is separated upward from the upper surface of the main body flange portion 12. An annular inner separating space 4 is formed between the inner annular portion 33 and the upper surface of the main body flange portion 12. The inner separated space portion 4 is formed over the entire circumference. The outer annular portion 34 is separated upward from the upper surface of the main body flange portion 12. An annular outer separation space 5 is formed between the outer annular portion 34 and the upper surface of the main body flange portion 12. The outer separated space portion 5 is formed over the entire circumference. The downward ridge 31 abuts on the upper surface of the main body flange portion 12 over the entire circumference. The downward ridge 31 abuts on the top 12a of the upper surface of the main body flange portion 12. The upper surface of the main body flange portion 12 rises from the inside toward the top 12a, and descends from the top 12a toward the outside. Therefore, the space between the inner separated spaces 4 becomes narrower in the vertical direction from the inner side to the outer side, that is, as it approaches the downward ridge 31. On the other hand, the distance between the outer separated space portions 5 in the vertical direction becomes wider as the distance from the downward ridge 31 increases.

As shown in FIG. 9, the vertical groove portion 41 of the communication concave groove 40 does not abut on the fitting surface portion 15 in the main body and does not abut on the inner portion of the main body flange portion 12 in the closed lid state. The internal space 3 of the container communicates with the inner separated space portion 4 via the groove inner space 6 of the communication concave groove 40. Since the downward ridge 31 of the lid flange portion 23 is in contact with the entire upper surface of the main body flange portion 12, the communication between the outer separation space portion 5 and the inner separation space portion 4 is provided by the downward ridge 31. It is blocked all around.

The food contained in the container can be cooked by putting it in a microwave oven with the lid closed. Steam is generated from food by microwave oven heating, and the pressure in the internal space 3 of the container rises. The generated steam enters the groove inner space 6 inside the communication concave groove 40 through the annular gap between the lid extending portion 27 and the main body step portion 14. In the present embodiment, since the four communication concave grooves 40 are formed, steam enters the inner separation space 4 through the groove inner space 6 of the four communication concave grooves 40. Since the downward ridge 31 is in contact with the upper surface of the main body flange portion 12 over the entire circumference, the downward ridge 31 prevents the steam from being discharged to the outside until the pressure in the internal space 3 of the container exceeds a predetermined value. To. On the other hand, since the inner separated space portion 4 is annular and is formed over the entire circumference, the steam fills the area immediately inside the downward ridge 31. The steam causes the lid flange portion 23 to be heated, and the resin of the lid flange portion 23 is softened.

Then, before the pressure in the internal space 3 of the container is excessively increased, the lid flange portion 23 is pushed upward by the pressure as shown in FIG. Since the resin of the lid flange portion 23 is already in a softened state, the lid flange portion 23 can easily rise upward. Moreover, since the inner annular portion 33 located inside the downward ridge 31 and the outer annular portion 34 located outside the downward ridge 31 are both separated upward from the main body flange portion 12, the lid flange is increased due to the increase in internal pressure. The portion 23 can be easily surfaced. At least a part of the entire circumference of the downward ridge 31 may be raised from the upper surface of the main body flange portion 12. As the downward ridge 31 rises from the upper surface of the main body flange portion 12 in this way, a gap is formed between the downward ridge 31 and the upper surface of the main body flange portion 12, and steam is discharged from the gap to the outer separation space portion 5. It is discharged to the outside of the container from the outer separation space 5.

Further, although a force is applied upward to the lid flange portion 23 by the steam, the steam is smoothly discharged to the outside before the pressure in the internal space 3 of the container is excessively increased, so that the lid 2 is a container. It will not come off from the main body 1. In particular, the fitting surface portion 15 inside the main body has an annular groove 16, the fitting surface portion 28 inside the lid has an annular ridge 30, and the annular ridge 30 of the lid 2 is an annular recess 30 of the container body 1. In the configuration that engages with 16, the lid 2 is surely prevented from coming off from the container body 1 during range heating. That is, the lid flange portion 23 can be levitated so as to rotate upward while the annular ridge 30 of the lid body 2 is locked in the annular concave groove 16 of the container body 1.

In the above embodiment, the structure does not have a middle plate, but a middle plate may be used.

1 Container body 2 Lid 3 Internal space 4 Inner separation space 5 Outer separation space 6 Groove space 10 Bottom surface 11 Main body side surface 12 Main body flange 12a Top 13 Side main 14 Main body step 15 Main body fitting Surface part 16 Circular concave groove 17 Concave groove 18 Main body edging part 20 Top surface part 21 Lid side part 22 Connecting part 23 Lid flange part 24 Convex part for preventing misalignment 25 Lid stepped part 26 Lid stepped part 27 Lid extending part 28 Lid inner fitting Face-to-face portion 29 Chamfered portion 30 Circular ridge 31 Downward ridge 32 Circular concave groove 33 Inner annular portion 34 Outer annular portion 35 Lid knob portion 40 Concave groove for communication 41 Vertical groove portion 42 Horizontal groove portion

Claims (2)

A container main body having a bottom surface portion, a main body side surface portion extending upward from the bottom surface portion and having a fitting surface portion inside the main body, and a main body flange portion provided around the outside of the main body side surface portion.
It is located between the top surface, the lid side surface extending downward from the top surface, the lid flange portion provided around the outside of the lid side surface portion, and the lid side surface portion and the lid flange portion, and is inside the main body in the closed state. A lid body provided with an inner lid fitting surface portion that is internally fitted to the fitting surface portion is provided.
Without providing a hole for steam discharge on the top surface of the lid, it is possible to prevent foreign matter from entering during display, and the lid flange, which is softened by the steam generated by heating with a microwave oven , maintains the inner fitting state. It is a food packaging container made of synthetic resin that can smoothly discharge this steam to the outside of the container by moving while moving .
On the lower surface of the lid flange portion, downward ridges are projected over the entire circumference.
At least one recessed groove for communication is formed on the outer surface of the fitting surface inside the lid.
In the closed state,
Due to the elastic deformation of the lid flange portion, the downward ridges of the lid flange portion come into contact with the entire circumference of the upper surface of the main body flange portion.
The outer annular portion of the lid flange portion located outside the downward ridge is separated upward from the upper surface of the main body flange portion, and the outer annular portion of the lid flange portion and the main body flange portion are annular. An outer annular space is formed, and the inner annular portion of the lid flange located inside the downward ridge is separated upward from the upper surface of the main body flange, and the inner annular portion of the lid flange and the main body flange are separated. An annular inner separation space is formed between the portions, and the inner space of the container communicates with the inner separation space through a groove for communication, which is a container for food packaging. The side surface of the main body is provided with a stepped portion of the main body between the side surface of the main body and the fitting surface in the main body.
The lid body is provided with a lid extension portion between the lid side surface portion and the lid inner fitting surface portion.
The food packaging container according to claim 1, wherein in the closed state, the lid extending portion is separated from the main body step portion without contacting the main body step portion over the entire circumference.

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