JP2004123210A - Thermally insulated container - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an insulated container capable of exposing an inner portion of a downward container main body to an atmosphere of a freezer or a refrigerator by preventing an upward opening of the downward container main body from being clogged when the container main bodies are vertically stacked on each other. <P>SOLUTION: In the thermally insulated container provided with the container main body having a thermally insulated circumferential wall, a thermally insulated circumferential bottom and an upward opening and a thermally insulated lid capable of opening and closing the opening of the container main body, the container main body has a step portion formed by recessing the circumferential wall downward from the upward edge surface on the upward edge inner margin side and the step portion is sized so that the downward edge portion of the container main body enters the inner side of the container main body from the upward opening. A plurality of ribs are vertically mounted in the step portion to receive a part of the downward edge surface of the upward container main body and produce a clearance for air permeation between the upward container main body and the downward container main body. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an insulated container used to transport frozen food, refrigerated food, and the like.
[0002]
[Prior art]
A cold food such as a frozen food or a refrigerated food is contained in an insulated container including a container body having a heat insulating structure at a peripheral wall and a bottom and an upper opening, and a lid having a heat insulating structure capable of opening and closing the opening of the container body. It is placed on a truck or the like and transported while being filled and kept cool.
As such a heat-insulating container, a heat-insulating container made of expanded polystyrene has been conventionally used, but recently, a foamed polystyrene having a foam layer formed on the inside and having a hard skin layer excellent in strength on the surface is formed. After injection of a polyolefin resin containing a foaming agent into the cavity space in the mold disclosed in Japanese Patent Application Laid-Open No. 8-90620, the cavity space is enlarged because the strength is superior to that of the mold made from the resin. Insulated containers and the like manufactured by a method of foaming a resin by use of a resin are also used.
[0003]
By the way, the operation of filling such an insulated container with frozen food or refrigerated food is often performed manually, but a worker cannot work for a long time in a freezer or a refrigerator. Therefore, the cold food to be filled is transported from the freezer or refrigerator to the workplace where the temperature is higher than that of the freezer or refrigerator, and the cold food is filled into the insulated container at the workplace, and then the filled freezer is opened and the freezer is opened. The refrigerator is transported to a refrigerator or a refrigerator where the temperature of the cold food which has been raised during the filling operation is re-cooled to a predetermined temperature, and then stored and shipped.
[0004]
In addition, the re-cooling as described above is performed by stacking a plurality of container bodies vertically so that a large amount of re-cooling can be performed in as little space as possible.In the case of a conventional insulated container, when the container bodies are stacked vertically, The upper opening of the lower container body is completely closed at the bottom of the upper container body, and the cold food in the lower container body hardly touches the freezer or the cool air of the refrigerator, and sufficient cooling is performed. Absent. Therefore, the container main bodies are stacked so that their axes are vertically displaced so that the upper opening of the lower container main body is not completely closed.
[0005]
However, the above stacking method lacks stability and cannot be stacked so high. Therefore, there is still a problem in terms of space.
[0006]
[Problems to be solved by the invention]
In view of the above circumstances, the present invention stacks container bodies vertically, exposing the inside of the lower container body to the atmosphere in the freezer or refrigerator without closing the upper opening of the lower container body. It is intended to provide an insulated container that can be used.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, a heat insulating container according to claim 1 of the present invention (hereinafter referred to as “a heat insulating container of claim 1”) has a container body having an upper opening having a peripheral wall and a bottom having a heat insulating structure. In a heat insulating container comprising a lid having an insulating structure capable of opening and closing the opening of the container main body, the container main body has a paragraph portion whose peripheral wall is recessed downward from the upper end surface on the upper end inner edge side. The lower end portion is formed to be large enough to enter the inside of the container main body from the upper opening, and when a plurality of container main bodies are stacked in the paragraph section, the lower end portion receives a part of the lower end surface of the upper container main body and receives the upper container. It is characterized in that a plurality of ribs are provided upright to create a ventilation gap between the main body and the lower container main body.
[0008]
The heat insulating container according to claim 2 of the present invention (hereinafter, referred to as “heat insulating container according to claim 2”) is the heat insulating container according to claim 1, in which both ends are received by the facing paragraphs of the container body, It is characterized in that the container body is provided with a detachable cold insulator while being fitted and positioned between adjacent ribs.
[0009]
The heat insulating container according to claim 3 of the present invention (hereinafter referred to as “heat insulating container of claim 3”) includes a container body having an upper opening having a peripheral wall and a bottom having a heat insulating structure, and an opening of the container body. In a heat-insulating container having a lid having a heat-insulating structure that is freely openable and closable, the container body has legs projecting from the lower surface thereof, and when a plurality of container bodies are stacked vertically, the legs of the upper container body enter. The upper container body is positioned, and a recess for receiving a leg is formed on the upper surface of the container body so as to create a ventilation gap between the upper container body and the lower container body. It is characterized by:
[0010]
An insulated container according to claim 4 of the present invention (hereinafter referred to as "insulated container of claim 4") is a heat insulating container according to any one of claims 1 to 4, wherein the container body and the lid are formed by a mold. After injecting molten thermoplastic resin impregnated with an inert gas at high pressure into the cavity space inside, the injection molding method is used to expand the cavity space of the container body and the part corresponding to the heat insulation required part of the lid and foam the resin. It is characterized by being formed.
The heat insulating container according to claim 5 of the present invention (hereinafter referred to as “the heat insulating container of claim 5”) is the heat insulating container of claim 1 or 2, wherein the container body is the injection container according to claim 4. Formed by a foam molding method, the bottom of the container body is foamed, and the bottom surface of the bottom is provided with an unfoamed frame portion, and a part of this frame portion is formed by vertically stacking the container body. It is characterized in that it is adapted to be received by a rib, and that a portion received by the rib is formed wider toward the outside of the container body than other portions of the frame-shaped portion.
[0011]
In the present invention, the production method and materials of the container body and the lid are not particularly limited, but a molten thermoplastic resin obtained by impregnating a cavity space in a mold with an inert gas at high pressure as in the heat insulating container of claim 4 is used. After the injection, the cavity space is preferably expanded by an injection foaming molding method in which the resin is foamed to improve the productivity and the surface strength.
According to the above injection foam molding method, a state in which the foamable thermoplastic resin impregnated with an inert gas is plasticized and measured by, for example, an injection molding device, and injected and filled in a mold, after which the resin is melted Thus, the container body and the lid can be obtained by moving the slide mold provided in the mold to expand at least a part of the mold cavity.
[0012]
That is, with the expansion of the mold cavity space, the inside of the mold cavity is rapidly depressurized to generate bubble nuclei and foam the resin, and while the mold is stopped, cooling is performed for a predetermined time, so that the mold is homogeneous. With a skin layer around an internal foam layer having fine bubbles, when viewed in the thickness direction, it has a three-layer structure of skin layer-internal foam layer (heat insulation layer) -skin layer, and is lightweight and rigid. A certain foam molded article can be obtained.
[0013]
As described above, the method for forming a molten thermoplastic resin that is impregnated with an inert gas at a high pressure is not particularly limited.For example, a resin in a solid state is impregnated with an inert gas under a high pressure, and And a method in which a molten resin is impregnated with an inert gas under high pressure.
[0014]
The inert gas can be used without particular limitation as long as it is an inert inorganic substance that is a gas at normal temperature and normal pressure and does not deteriorate the resin. For example, carbon dioxide (CO ₂ ) gas, nitrogen, argon, neon, helium, oxygen and the like can be mentioned. These may be used alone or in combination of two or more. It is most preferable to use carbon dioxide because the melt viscosity of the resin is greatly reduced.
[0015]
Among the methods for forming a molten thermoplastic resin impregnated with an inert gas, as a method of impregnating a resin in a solid state with a gas under a high pressure, for example, the following method can be mentioned.
(1) A method of previously impregnating the resin in a pellet or powder state with a high-pressure container or the like with an inert gas, and (2) a method of supplying and impregnating the region from the hopper of the molding apparatus to the solid transporting section with the inert gas.
In the case of (2), it is preferable to incorporate a pressure-resistant seal structure of the screw drive shaft and the hopper so that gas does not volatilize from the kneading device.
[0016]
Further, as a method for impregnating the molten resin with an inert gas under high pressure, for example, the following method can be mentioned. In this case, it is preferable to perform pressure sealing with a resin in a molten state.
(1) a method of supplying an inert gas to a molten resin in a molten state in a cylinder of an injection machine from a vent portion in the middle of the cylinder using a vent type screw, and (2) an injection machine And supplying the molten resin in a molten state in the cylinder from an inlet provided in the rear of the screw through an supply path provided in the screw from an inert gas supply port in the screw in front of the tip.
[0017]
The amount of gas impregnated in the thermoplastic resin may be an amount capable of reducing the required melt viscosity of the resin, and may be appropriately selected depending on the type of the resin and the type of the gas. It is desirable to dissolve 50 to 50 parts by weight of gas, more desirably 0.1 to 5 parts by weight of gas. It is most preferable that the dissolution of the gas is in a saturated state, but this point does not necessarily have to be achieved.
[0018]
The pressure at the time of impregnation of the gas is preferably (gas critical pressure−5 MPa) or more and (gas critical pressure + 20 MPa) or less, more preferably (gas critical pressure−4 MPa) or more and (gas critical pressure + 5 MPa) or less. It is particularly preferable that the gas is in a supercritical state in order to uniformly impregnate the gas into the thermoplastic resin.
Note that the supercritical state refers to a state at a critical temperature and a critical pressure or higher. For example, when the gas is carbon dioxide, the critical temperature is 30.9 ° C. and the critical pressure is 7.4 MPa, and when the gas is nitrogen, the critical temperature is −146.9 ° C. and the critical pressure is 3.4 MPa.
[0019]
That is, if it is less than (critical pressure of gas-5 MPa), the impregnation amount will be small and the expansion ratio will be low, and if it exceeds (critical pressure of gas + 20 MPa), the pressure will be too high, and the equipment will be large, Not preferred.
After the gas is supplied to the thermoplastic resin, the temperature and pressure are preferably maintained for a certain period of time in order to impregnate a sufficient amount of gas.
[0020]
In any of the methods for impregnating a thermoplastic resin with an inert gas, the rate of impregnation of the resin changes depending on the pressure of the inert gas, the supply / injection position, the temperature of the resin, and the like. The form, expansion ratio, etc. also change, and the heat insulating effect changes. For example, if the pressure of the inert gas is high, the rate of impregnation with the resin increases, and the expansion ratio of the obtained foamed molded article increases.
[0021]
After injection filling of the mold with the inert gas impregnated resin, by controlling the production time such as the time until the mold cavity is expanded, the speed of expanding the cavity space, the resin temperature in the mold, etc. It is possible to adjust the thickness of the skin layer and the internal foam layer, the cell structure such as closed cells and open cells, the foam diameter, and the like of the obtained foam molded article.
Incidentally, the expansion speed in the thickness direction of the mold cavity is not particularly limited, but is preferably 0.5 mm / sec to 15 mm / sec. That is, if the speed is too high, the resin separates from the mold surface, and the transfer to the mold is deteriorated, which may cause poor appearance. In addition, even if it is too slow, the resin solidifies while the mold cavity is expanded, and the resin cannot follow the mold, resulting in poor appearance or a large foam diameter. There is a risk that the heat insulation effect of the body will be poor.
[0022]
The thermoplastic resin is not particularly limited, but preferably has a melt tension suitable for foaming (specifically, 0.069 N at 200 ° C. = 7 gf or more) and an extensional viscosity property, For example, in addition to polyolefin-based resins such as polyethylene-based resins and polypropylene-based resins, polystyrene-based resins, acrylonitrile-butadiene-styrene copolymer (ABS resin), polyvinyl chloride-based resins, and the like can be mentioned. Two or more of these resins can be used in combination. Among these resins, polyolefin resins are preferable, and polypropylene resins are particularly preferable in terms of recyclability and physical properties.
[0023]
The polypropylene resin referred to here is not limited to a homopolymer of polypropylene, but a general polypropylene such as a random copolymer or a block copolymer with another copolymerizable monomer, and a metallocene polypropylene obtained using a metallocene catalyst, or It also includes polypropylene having a long-chain branch and graft-polymerized other components. These may be used alone or in combination of two or more.
[0024]
The thickness of the inner foam layer and the skin layer depends on the material, shape and use of the foamed molded product, but generally the thickness of the inner foam layer is about 10 to 30 mm at the maximum thickness portion, The thickness is preferably about 0.4 to 1.2 mm.
Further, the foamed cell diameter of the internal foamed layer for maximizing the heat insulating performance is generally a fine foamed form of 10 to 800 μm, and the foaming ratio of the internal foamed layer is preferably 8 times or more and 50 times or less, more preferably 10 times or less. It is not less than twice and not more than 40 times.
[0025]
That is, if the diameter of the foamed cells is too small, sufficient heat insulating performance may not be ensured. If the diameter is too large, rigidity or the like may be impaired. On the other hand, if the expansion ratio of the internal foam layer is too small, sufficient heat insulating performance may not be secured, and if it is too large, the rigidity and the like may be affected.
[0026]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described in detail with reference to the drawings showing the embodiments.
1 to 8 show one embodiment of a heat insulating container according to the present invention.
[0027]
As shown in FIG. 1, the heat insulating container 1 includes a container main body 2a and a lid 3. The container main body 2a injects a molten polypropylene resin impregnated with an inert gas such as carbon dioxide into the cavity space in the mold, and then heat-insulates the peripheral wall 21 and the bottom 22 of the container main body 2a in the cavity space. Is formed by expanding the resin in the thickness direction of the container body 2a to foam the resin, and then cooling and solidifying the resin in a mold, and has a substantially rectangular cross section having an opening 25 at the top. That is, except for the upper end 21a and the bottom 22 of the peripheral wall 21, the surface is formed by a skin layer having excellent surface strength and almost no foaming, and an intermediate foam layer having a heat insulating effect is formed between the skin layers. It has a heat insulation structure.
[0028]
1, 2 and 4, the upper end 21a of the peripheral wall 21 is formed of non-foamed resin, and is recessed downward from the upper end surface toward the upper inner edge. A paragraph section 23 is formed, and a plurality of ribs 24 are erected on the paragraph section 23.
[0029]
The upper end of the rib 24 is located at a position lower than the opening 25 of the container body 2a, and the cavity space of the mold does not expand after injection during molding, so that the rib 24 is hardly foamed.
The ribs 24 are provided symmetrically at six positions on the long side of the paragraph section 23 and at two positions on the short side, respectively, and between the two ribs 24 on both sides of the rib 24 on the long side. The respective pitches between the two central ribs 24 are substantially the same as or slightly larger than the widths of the locking portions 41 provided at both ends of the cold insulator 4 described later.
[0030]
Further, the container body 2a has a bottom 22 formed in a foamed state, and an unfoamed frame-like portion 26 is provided on a lower surface of the bottom 22.
The frame-shaped portion 26 is provided so as to remain in an unfoamed state in order to regulate the foamed shape of the bottom 22 to a predetermined shape when expanding and expanding the cavity space corresponding to the bottom portion. When the container main body 2a is vertically stacked vertically, a part thereof is received by the rib 24 of the lower container main body 2a. The portion received by the rib 24 is a wide portion 27 that is wider toward the outside of the container body 2a than other portions of the frame portion 26.
[0031]
That is, as shown in FIGS. 1 and 5, when the plurality of container bodies 2a are vertically stacked, the wide portion 27 of the upper container body 2a is close to the opening 25 of the lower container body 2a. In a state where a small gap is formed between the inner container and the inner wall surface, the lower container body 2a is received from below by the rib 24. Therefore, even if the upper container body 2a attempts to move in the horizontal direction, the wide portion 27 hits the inner wall surface near the opening 25 of the lower container body 2a, and the movement is regulated, and the container body 2a is stabilized. Can be stacked. Since the portion other than the wide portion 27 of the frame portion 26 has a small width, a sufficient gap 5 is secured between the upper container main body 2a and the lower container main body 2a as shown in FIG. You. Therefore, as shown by an arrow in FIG. 5, the inside of the lower container body 2a and the external atmosphere can always be moved back and forth through the gap 5.
[0032]
As shown in FIG. 1, a plurality of ridges 28 project in parallel from the inner bottom surface of the container body 2a.
The ridge 28 receives cold food stored in the container body 2a from below, and always creates a gap between the cold food and the bottom.
[0033]
The cold insulator 4 includes a rectangular synthetic resin main body 40 filled with a regenerator and locking portions 41 extending from both ends of the main body 40. As shown by a solid line in FIG. 41 is received from below on the paragraph 23 between the two ribs 24 at the center of the paragraph 23 on the long side, or as shown by the chain line in FIG. The container body 2a is attached to the container body 2a while being received by the paragraph section 23 from below, so that the inside of the container body 2a can be kept cool for a long time.
[0034]
As shown in FIGS. 1, 7 and 8, the lid 3 is molded using the same injection foam molding method as the container main body 2a, and extends downward from the main body 31. And a skirt portion 32.
The main body 31 has the same heat insulating structure as the peripheral wall 21 and the bottom 22 of the container main body 2a, and the edge of the main body 31 is positioned so that the two substantially U-shaped positioning ribs 38 face the opening side of the U shape. A substantially L-shaped locking rib 34 is protruded from each corner of the upper surface of both positioning ribs 38 along the edge of the positioning rib 38.
That is, when the heat insulating containers 1 are vertically stacked on the upper surface thereof, the lid 3 swells downward on the inner side of the frame portion 26 of the bottom 22 of the upper container body 2a as shown in FIG. The bulging portion 22a fits into the concave portion 33 formed between the positioning ribs 38, and the peripheral wall of the bulging portion 22a hits the inner wall surface 38a of the positioning rib 38 even if the upper heat insulating container 1 attempts to move in the horizontal direction. . Therefore, the plurality of heat insulating containers 1 can be stably stacked in the vertical direction with the lid 3 closed. Further, the locking rib 34 is not shown, but when another container is placed on the lid 3 whose bottom can be received from below on the upper surface of the two positioning ribs 38, this other container Even if the container attempts to move in the horizontal direction, the outer wall surface of the lower end of the container is locked by the inner wall surface of the locking rib 34, so that the container can be stably placed so as not to move from directly above the lid 3. I have.
[0035]
The lid 3 is attached to the container main body 2a such that the skirt portion 32 surrounds the upper end 21a of the peripheral wall 21 of the container main body 2a from outside, and the main body 31 closes the upper opening of the container main body 2a. It has become.
[0036]
The heat insulating container 1 is configured as described above, and has the following excellent effects.
(1) When the container main bodies 2a are vertically stacked, the lower end of the upper container main body 2a enters the lower container main body 2a, so that the container main body 2a can be stably stacked high and the upper container main body 2a can be stacked. A gap 5 is always formed between the container body 2a and the lower container body 2a so that the inside of the lower container body 2a and the external atmosphere communicate with each other as shown by arrows in FIG. The re-freezing or re-cooling of the cold-required food filled therein can be efficiently performed in a freezer or a refrigerator.
[0037]
(2) After the container main body 2a and the lid 3 inject a molten polypropylene resin impregnated with an inert gas such as carbon dioxide at a high pressure into the cavity space in the mold, the cavity space of the part requiring heat insulation is removed from the container main body. Alternatively, it is formed by expanding the resin in the thickness direction of the lid and foaming the resin, and then cooling and solidifying it in a mold, so that productivity is good and the surface is stronger than foamed styrene containers. And has excellent durability.
(3) Both the container body 2a and the lid 4 are excellent in recyclability because the skin layer and the intermediate foam layer are formed only of the polypropylene resin.
[0038]
(4) Since the cold insulator 4 is configured such that the retaining portion 41 is received by the paragraph portion 23 from below and is positioned on the container body 2a while being positioned by the ribs 24, the container body 2a is provided. In addition to efficiently keeping the cold food filled therein, the cold insulator 4 does not fall on the cold food in the container body 2a due to vibrations during transportation, and the cold food is not damaged.
(5) Since the ridges 28 are provided on the inner bottom surface of the container body 2a, cold food is received by the ridges 28, and a gap is always formed between the cold food and the inner bottom surface of the container body 2a. Occurs. Therefore, cold air such as the cold insulator 4 spreads below the cold food in the container body 2a, and the cold food can be efficiently cooled.
[0039]
(6) The frame portion 26 of the container body 2a is provided with the wide portion 27 only in the portion that can be received by the rib 24, and the other portions are narrow, so that the entire frame portion 26 can be formed without distortion. When the container main body 2a is vertically stacked vertically, the narrowed portion other than the wide portion 27 of the frame-shaped portion 26 causes a narrow portion between the upper container main body 2a and the lower container main body 2a. A gap 5 sufficient for ventilation can be secured. Further, the wide portion 27 hits the inner wall surface of the lower container body 2a, and the horizontal movement of the upper container body 2a is regulated, so that the container body 2a can be stably stacked.
[0040]
FIG. 9 shows another embodiment of the heat insulating container according to the present invention.
As shown in FIG. 9, the heat insulating container 10 has four legs 29 extending downward from four corners of the bottom surface of the container main body 2b, and the ribs 24 are not provided in the paragraph portion 23. When two are stacked, the four legs 29 are received by the paragraph section 23 of the lower container body 2b, and a ventilation gap is formed between the upper container body 2b and the upper end surface of the lower container body 2b. It is the same as the above-mentioned heat-insulating container 1 except that it occurs.
[0041]
The heat insulating container according to the present invention is not limited to the above embodiment. For example, in the above-described embodiment, the container body and the lid are formed using the injection foaming molding method. However, the container body and the lid are manufactured by a method of injection-filling expanded polystyrene into a hollow molded body having a lid shape. It does not matter.
[0042]
【The invention's effect】
Since the heat-insulating container according to the present invention is configured as described above, even if the container main bodies are vertically stacked, the lower end portion of the upper container main body completely closes the upper opening of the lower container main body. Without exposing the interior of the lower container body to the atmosphere in the freezer or refrigerator. That is, the re-cooling of the cold-required food filled in the container body can be efficiently performed in a small space. Further, the container main body can be stacked high in a stable state.
In particular, according to the insulated container of the second aspect, it is possible to efficiently keep the cold food filled in the container body cool, and the cold insulator is placed on the cold food inside the container body due to vibration during transportation. It does not fall and damage cold foods.
Further, according to the heat insulating container of the fourth aspect, it is possible to easily manufacture and to have excellent durability.
According to the heat insulating container of the fifth aspect, a large gap for ventilation can be ensured, and a stable stacked state of the upper container body can be ensured by the wide portion.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view illustrating one embodiment of a heat insulating container according to the present invention, in which the container body is stacked with a container body closed with a lid.
FIG. 2 is a plan view of a container body of the heat insulating container of FIG.
FIG. 3 is a bottom view of the container main body of FIG. 2;
FIG. 4 is a sectional view taken along line XX of the container main body of FIG. 2;
FIG. 5 is a cross-sectional view when the container bodies of FIG. 2 are vertically stacked.
6 is a plan view of the container main body for explaining a state in which a cooling material is attached to the container main body of FIG. 2;
FIG. 7 is a plan view of a lid of the heat insulating container of FIG. 1;
FIG. 8 is a sectional view taken along line YY of the lid of FIG. 7;
FIG. 9 is a cross-sectional view showing another embodiment of the heat insulating container according to the present invention, in which the container main bodies are vertically stacked.
[Explanation of symbols]
1, 10 Insulated containers 2a, 2b Container main body 21 Peripheral wall 22 Bottom 23 Paragraph section 24 Rib 25 Opening section 26 Frame section 27 Wide section 29 Leg 3 Lid 4 Cold insulator 40 Main body 41 Lock section

Claims (5)

In a heat-insulating container, the peripheral wall and the bottom of which have a heat-insulating structure, a container body having an upper opening, and a lid having a heat-insulating structure capable of opening and closing the opening of the container body.
The container main body has a paragraph portion whose peripheral wall is recessed downward from the upper end surface on the upper end inner edge side, and the lower end portion of the container main body is formed to be large enough to enter the inside of the container main body from the upper opening, and the paragraph portion When a plurality of container bodies are stacked, a plurality of ribs for receiving a part of the lower end surface of the upper container body and forming a ventilation gap between the upper container body and the lower container body are formed. An insulated container characterized by being erected. The heat insulating container according to claim 1, wherein both ends are received by the facing paragraphs of the container body, and the heat insulating material is provided with a refrigerating material detachable from the container body in a state of being fitted and positioned between adjacent ribs. In a heat-insulating container, the peripheral wall and the bottom of which have a heat-insulating structure, a container body having an upper opening, and a lid having a heat-insulating structure capable of opening and closing the opening of the container body.
The container body has legs protruding from the lower surface thereof, and when a plurality of container bodies are stacked vertically, the legs of the upper container body enter to position the upper container body and to position the upper container body. A heat-insulating container, wherein a concave portion for receiving a leg is formed on an upper surface of the container main body so as to create a ventilation gap between the main body and the lower container main body. After injecting the molten thermoplastic resin in which the inert gas is impregnated with high pressure into the cavity space in the mold, the container body and the lid expand the cavity space of the container body and the portion corresponding to the heat-insulating required portion of the lid to expand the resin. The heat-insulating container according to any one of claims 1 to 3, wherein the heat-insulating container is formed by an injection foam molding method for foaming. The container body is formed by the injection foam molding method according to claim 4, wherein the bottom of the container body is foamed, and the bottom surface of the bottom is provided with an unfoamed frame-like portion. When a part of the container body is stacked in the vertical direction, the rib is received by the rib, and the part received by the rib is directed toward the outside of the container body as compared with the other part of the frame portion. The heat insulating container according to claim 1, wherein the heat insulating container is formed wide.

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