JP2000344227A - Paper heat insulation and cold insulation case - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a paper double-walled box used when various kinds of items requiring heat insulation and cold insulation are packaged, transported or stored and replaced with a resin molded container such as foamed styrole and the like. SOLUTION: There is provided a double-walled box comprised of an outer packaging box 11 made of cardboard material and an inner packaging box 12 arranged inside the outer packaging box, wherein each of the outer packaging box 11 and the inner packaging box 12 is assembled from a separate blank sheet, a member forming a clearance of predetermined space is arranged at the inner packaging box 12 and then an air layer 13 having a low thermal conductivity is formed between at least both inner and outer packaging boxes.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to agricultural and marine products,
Or paper-based thermal insulation for packing livestock products (including their processed foods) and confectionery such as cakes, or for packaging various articles that require cooling or thermal insulation so that they are not exposed to room temperature. About the case.

[0002]

2. Description of the Related Art When shipping various agricultural products and marine products, etc., from a production site or a processing plant, or when transporting and transporting articles requiring heat insulation and cooling to a required place, the production site of the shipment is required. From the viewpoints of adjusting, maintaining freshness of shipped products, stabilizing the quality, and not deteriorating the commercial value, the articles themselves are often subjected to a freezing treatment or a pre-cooling treatment. For transporting, storing, or transacting such frozen or pre-cooled articles, use a synthetic resin insulated container, particularly a container molded using a resin foam such as styrene foam. That is widely done. This is because the synthetic resin container has advantages such as light weight, excellent heat and cold retention, no reduction in strength of the container due to moisture, and sanitation. However, such a synthetic resin container has a large volume that the container itself occupies, and has a structure in which the container cannot be folded flat. Therefore, when not used as a container (when contents are not stored), a large space is required for storage. There is also a similar problem when a container is manufactured and then transported to a user's hand.
Furthermore, the recovery and reuse of used containers is currently very costly and difficult. Also, there is an environmental problem in disposal. Therefore, in recent years, a cold storage container using paper such as paperboard or corrugated cardboard that can be collected and recycled through a general used paper collection route has been desired.

[0003] Conventionally, as corrugated cardboard for packaging of fruits and vegetables, for example, those in which a plastic film layer is provided on an intermediate layer of a liner as disclosed in Japanese Utility Model Laid-Open No. 49-59978 and Japanese Patent Publication No. Sho 62-47712 are disclosed. What has been known is a film obtained by laminating a film on the surface of a liner. In the above-mentioned items, when transporting fruits and vegetables, respiratory disorders, overheating disorders due to ethylene gas and the like are likely to occur. Also,
The film layer itself is liable to generate pinholes and tears. The same is true for the film laminated on the liner surface, and furthermore, the absorbability from the film surface is poor, and there is a problem that the suitability for box making such as glue joining when printing or box making is deteriorated. . In addition, the above materials are expensive. Moreover, it is not easy to recycle the paper after use as a cardboard box. Also recently, paper 2
As a container having a double wall structure, a paper container disclosed in JP-A-9-58662 has been proposed. This paper container is a type of container formed by folding a single sheet of paper blank, in which both the bottom surface and the side surface form a space between the inner wall and the outer wall, and the space between the inner bottom surface and the outer bottom surface. It is configured to be used with a cooling agent. But,
The above paper container has the following problems.
That is, the container is folded using a piece of paper blank to form a space between the inner and outer walls of the bottom and side surfaces, and a cooling agent is used between the inner and outer bottom surfaces. Since it is a product, it takes time and effort to form a cool space and use the container itself, and the assembling workability is poor. In addition, since the paper blank itself formed by the container has a complicated developed shape, there is also a problem that the paper removing cost is high.

[0004]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned conventional problems, and is used for packaging various articles which need to be kept warm and cold to maintain freshness, and used for transporting or storing at room temperature. This is a paper-made double box that replaces resin molded containers such as styrofoam. It consists of an outer box and an inner box. A low thermal conductivity air layer is formed between the two boxes while keeping the inside of the inner box warm and cold. It is an object of the present invention to provide a heat-retaining cool case that can hold an article requiring the above, and both the boxes are easy to assemble and disassemble, and are excellent in blank paper removal cost. The present inventor has examined the problems of the conventional paper container, and as a result, as long as a separate inner box can be supported in a suspended state in the outer box with a sealed heat-insulating space therebetween, the inner and outer combined double box is required. If the effect of the function is to increase the heat insulation and cooling effect of the articles, and if the inner box can use a case of a normal structure while using a general cardboard box, so-called A-type box, the material forming the inner and outer boxes The double box can be manufactured by simple assembling operation when used, and the double box can be disassembled and folded flat when not in use. The inventors have found that no wasteful storage and transportation space is required, and have completed the present invention.

[0005]

The present invention comprises an outer box made of paper, such as cardboard, and an inner box provided inside the outer box.
The outer shape is a double box of a substantially rectangular parallelepiped or a cuboid, and these outer box and inner box are assembled from separate blank sheets, and a member that forms a gap at a predetermined interval between the outer box and the inner box. A paper heat insulation / cooling case provided on the interior box side, wherein an air layer having low thermal conductivity is formed at least between the inner and outer boxes. As the material of the box used in the present invention, a corrugated cardboard sheet is preferable. Further, as the corrugated cardboard sheet, a water-resistant corrugated cardboard that can be recycled into paper after use as a corrugated cardboard box is suitably used. Various methods can be adopted. That is, it is preferable to use a water-resistant corrugated cardboard sheet in order to prevent condensation generated due to a difference in temperature between the inside and outside and deterioration of the strength of the box due to wetness from outside and inside. Therefore, at least one of the inner and outer boxes constituting the double box of the present invention may be formed of water-resistant corrugated cardboard subjected to a water-repellent treatment or a waterproof treatment, and the other may be formed of paperboard (carton paper). Also, in the present invention, a heat reflecting film or a heat insulating film is bonded to at least one side of a paper sheet, for example, an intermediate layer of paper or at least one side of paper, which can maintain the freshness inside the container even if there is some problem in regeneration. Paper can also be used as the material of the box.

In the present invention, an interior box having the following configuration can be applied. The blank sheet of the interior box has four panels 4a, 4b in one direction through ruled lines.
4c, 4d and the body sticking flap 4e are connected to each other, and the four seal end inner flaps 5a, 5c, 6a, 6c and the four seal end outer flaps are vertically arranged perpendicular to the connecting direction of the four panels. 5b, 5d, 6b, and 6d are connected, and the seal end outer flaps are used by abutting each other on the seal end inner flaps at the time of assembly, and are used by being folded back to the tip of the seal end outer flaps outside the flaps. Four abutting members 7a, 7b, 8
a and 8b are integrally connected, and when these abutting members are folded back to the outside of the seal end outer flap, they protrude to the outside of the flap, and the inner dimensions of the left and right side plates 1a and 1c of the outer box. And a blank sheet that is set to about half the size. At the time of assembling and using this blank sheet, the abutting member is brought into contact with the left and right inner surfaces of the outer box, and between the outer box and the inner box, a gap at a predetermined interval in the top and bottom direction of the box and the front-back direction. To form an air layer with low thermal conductivity. 2 of this form
In the heavy box, no gap is formed between the inner box and the outer box on two surfaces of the hexahedron, but the two surfaces have a heat insulating effect by forming the inner box from triple sheets.

[0007] In another type of interior box applicable to the present invention, a pair of side panels 31, 31 are provided on two long sides of a rectangular bottom panel 30, and a pair of side panels are provided on two short sides. Panels 32, 32 are connected via a ruled line, and the side panels 31, 31 on the long side are arranged such that the length of the side adjacent to the bottom panel 30 is longer than the long side of the bottom panel 30. And a pair of cuts 33a, 33b cut into the bottom panel 30 near the boundary between the bottom panel 30 and the side panels 31, 31 to form a pair of legs on the side panels 31, 31, respectively. 34
a, 34b, respectively, and the side panels 31,
A pair of protrusions 35a, 35 protruding upward from the upper edge of 31
b, the top panels 37, 37 are connected to each other on an extension of the other side panels 32, 32, and the top panels 37, 37 have side surfaces that are adjacent to the side panels 32, 32, respectively. Panels 32, 32 are formed so as to protrude on both sides of the sides of the side panel so as to be longer than the length of the sides,
A blank sheet is provided at the front and rear side edges of the top panel with cutouts 38 which engage with a pair of projections 35a, 35b projecting above the side panels 31, 31, respectively.
At the time of assembling and using the blank sheet, a gap is provided at a predetermined interval between the outer box and the inner box on the six sides of the box in the vertical direction, the front-rear direction, and the left-right direction to form an air layer having low thermal conductivity. Let it. In the double box of this embodiment, the legs 34a, 34b and the projections 35a, 35b are formed on the long side of the interior box, but may be provided on either side when the box is a cube. Also, a notch 33 provided on the bottom panel 30 of the interior box
Since a hole is formed in the bottom surface of the interior box due to a and 33b during assembly, it is preferable to arrange a separate sheet on the inner bottom of the interior box.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A concrete embodiment of the present invention will be described with reference to the drawings. FIGS. 1A and 1B are developed views of an outer box and an inner box used in one embodiment of the present invention.
FIG. 2 is an explanatory diagram showing an assembling order of the double box of this embodiment.

In the double box of this embodiment, as shown in FIG. 2, a side-loading type inner box 12 is inserted into an A-type box type outer box 11, and the outer box and the inner box are inserted. A gap is provided at a predetermined interval between the top and bottom of the box and the front-back direction to form the air layer 13 having low thermal conductivity.

The shape of the blank of the outer box 11 is shown in FIG.
This is shown in FIG. This blank is made up of two side plates 1a to 1d and a body sticking flap 1
e is connected. That is, the left and right side plates 1a and 1c and the front and rear side plates 1b and 1d are connected alternately. In addition, upper and lower flaps 2a and 2c and upper and lower flaps 2 are provided above and below the four side plates.
b, 2d or the inner bottom flaps 3a, 3c and the outer bottom flaps 3b, 3d are connected alternately.

The shape of the blank of the interior box 12 is shown in FIG.
This is shown in (b). This blank connects the front and rear side panels 4a and 4c, the top panel 4b, the bottom panel 4d and the body sticking flap 4e in one direction through ruled lines, and has the following structure above and below the four panels. The seal end flap is connected.

1 shows the front and rear side panels 4a and 4c.
The upper and lower seal end flaps 5a, 5c and 6a, 6c are connected vertically, and the upper and lower seal end flaps 5b, 6b and 5d, 6d are connected vertically above and below the top panel 4b and the bottom panel 4c in FIG. I have. The length of the long sides of the four panels 4a to 4d is set slightly shorter than the long sides of the long side plates 1b and 1d of the outer box.

[0013] Seal end outer flaps 5b, 5d and 6
b and 6d are seal end inner flaps 5a and 5c or seal end inner flaps 6a and 6a when the interior box is assembled.
The flap has a length enough to close the opening surface of the interior box so as to abut on the upper surface of the inner box 6c. Abutting members 7a, 7b and 8a, 8a which are used by being folded back to the outside of the flaps at the ends of these flaps.
b are connected continuously.

As shown in FIG. 2 (b), when the abutting member is folded out of the seal end outer flap, it protrudes out of the flap (FIG. 1 (b)).
Inside, the overhang portion X is drawn by hatching), and the length and the width are formed larger than the flap.
Also, as shown in FIGS. 1B and 2D, the size of the abutting members 7a, 7b and 8a, 8b is about half of the inner size of the left and right side plates 1a, 1c of the outer box. Set the size. Then, when assembling and using this member, the member is brought into contact with the inner surfaces of the left and right side surfaces 1a and 1c of the outer box 11,
A gap can be formed at a predetermined interval between the outer box 11 and the inner box 12. That is, the outer box 11
A gap is provided at predetermined intervals in the vertical direction and the front-back direction of the interior box 12 to form the air layer 13 having low thermal conductivity.

Hereinafter, a method of assembling the outer box and the inner box and a method of assembling them will be described. First, the exterior box 11 is formed by folding four side plates 1a to 1d into a rectangular tube shape and connecting them via a body sticking flap 1e, and then connecting the bottom inner flaps 3a and 3c and the bottom outer flaps 3b and 3d to the bottom surface of the outer box. Is closed with glue or tape. The interior box 12 has four panels 4
After a to 4d are folded into a rectangular tube shape and connected to each other via a flap 4e for sticking the body, a tubular body is filled, and the inside thereof is filled with an object to be packaged (side-loading a product requiring heat insulation or cold insulation). Next, the seal end inner flaps 5a and 5c and the seal end inner flaps 6a and 6c and the seal end outer flaps 5b and
d and the outer flaps 6b and 6d of the seal end are abutted against each other to close the opening surfaces at both ends of the cylindrical body.

Thereafter, as shown in FIG. 2B, the abutting members 7a, 7b and 8a, 8b are folded back to the outside of the seal end outer flap. Then, as shown in FIG. 2D, the interior box 12 is inserted into the exterior box 11, and the butting members 7a, 7b and 8a, 8b are respectively brought into contact with the left and right inner side surfaces 1a, 1c of the exterior box. , Exterior box 11 and interior box 1
2, a gap is provided at a predetermined interval in the vertical direction and the front-back direction of the box to form an air layer 13 having low thermal conductivity (see FIG. 2D). Thereafter, the top surface of the outer box is attached to the inner flaps 2a and 2c and the outer flaps 2b and 2d.
And glue or tape these flaps to complete the packaging. If necessary, a coolant or the like can be stored in the interior box or in the gap 13.

In this embodiment, an air layer is provided between the inner and outer boxes on the four sides of the hexahedron, and the air layer is not provided on the other two sides. , Thereby having a heat insulating effect. In this way, the cool air is confined in the double box so that the packaged goods are not exposed to the room temperature, and the cooling effect and the cooling time of the packaged goods are greatly improved. enable.

Next, a second embodiment of the present invention will be described. FIGS. 4A and 4B are development views of the interior box used in the second embodiment and a bottom pad laid on the bottom surface of the interior box. FIG. 5 is an explanatory diagram showing an assembling order of the double box of this embodiment.

Even in the double box of this embodiment, FIG.
As shown in (c), an A-type box type box 21 is used as the outer box. The interior box 22 is placed inside the exterior box.
And a gap is provided at a predetermined interval between the outer box and the inner box to form an air layer 23 having low thermal conductivity. In this embodiment, as shown in FIG. 5B and FIG. 6, the air layers 23 having low thermal conductivity are formed in all the directions of the six surfaces of the box.

The blank shape and the assembling method of the outer box 21 of this embodiment have the same structure as that of the outer box of the first embodiment. Therefore, detailed description of the outer box is omitted here. In the drawings, the same members are denoted by the same reference numerals.

The shape of the blank of the interior box 22 is shown in FIG.
This is shown in FIG. This blank is provided with a pair of side panels 3 on opposite sides of the longer side of the substantially rectangular bottom panel 30.
1 and 31 are provided, and a pair of side panels 32 and 32 are connected to the other side (short side) via a ruled line. The long side panel 31 is formed to protrude on both sides of the long side of the bottom panel 30 so that the length of the side adjacent to the long side of the bottom panel 30 is longer than the long side of the bottom panel 30. (FIG. 4
In (a), the overhang portion Y is drawn by hatching).

Near the boundary between the bottom panel 30 and the side panel 31, a pair of left and right U-shaped cuts 33a and 33b cut into the bottom panel 30 are provided. 34a and 34b are formed as a pair. A pair of projections 35a, 35b projecting upward from the upper side of the side panel 31 opposite to the legs, and bendable projections 3 are provided on both sides of the projections via folding ruled lines.
6a and 36b are formed.

On the extension of the side panels 32, 32 on the short side, top panels 37, 37 having the following configuration for closing the top of the box by abutting each other are connected. . That is, as shown in FIG. 4A, the pair of top panels 37 is formed such that the length of the connected side is longer than the length of the connected side of the side panel 32 (FIG. 4A). In (a), the overhang portion Z is indicated by hatching). Notches 3 are formed in front and rear side edges of the panels 37, 37 so as to engage with a pair of protrusions 35a, 35b projecting upward from the side panels 31, 31, respectively.
8 and 38 are provided.

Next, an assembling method will be described. The method of assembling the outer box 21 is the same as that in the first embodiment. Next, how to assemble the interior box 22 is as follows.
1 is started and inserted into the outer box 21. At this time, the short side panels 32, 32 and the top panels 37, 37 are inside the long side panels 31, 31, and the long side panels 31, 31 are inserted into the outer box 21. Then, the side panels 32 on the short side are folded upright with respect to the bottom panel 30. The top panels 37, 37
Does not enter inside the interior box due to the presence of the bent projections 36a and 36b (see FIG. 5A).

Next, the bent projections 36a, 36b
Is bent outward and the bent protrusions 36a and 36b are inserted into the outer box 21 (in FIG. 5B, the outer box is indicated by a dotted line). In this state, the article to be packaged is filled in the interior box 22. By the way, at the time of filling the items to be packaged,
The bottom pad 40 shown in FIG. 4 (b) may be arranged on the bottom panel 30 to close the hole formed by the legs 34a and 34b. Next, the top panel 37,
A pair of protrusions 35a and 35b projecting upward by bending 37 inward are engaged with the notches 38 of the top panel 37 to close the top surface of the interior box as shown in FIG. 5C.

When the inner box 22 is inserted into the outer box 21, the inner box is lifted from the bottom surface of the outer box by the legs 34a and 34b of the inner box. The projections 35a, 3
5b protrudes upward from the top panel 37 opposite to the legs. The left and right overhanging portions Y of the side panel 31 and the front and rear overhanging portions Z of the top panel are respectively brought into contact with the left and right inner side surfaces and the front and rear inner side surfaces of the outer box 21, respectively.
Air gaps 23 having low thermal conductivity are formed by providing gaps at predetermined intervals between the inner box 1 and the inner box 22, that is, on all six surfaces in the top, bottom, front and rear, and left and right directions of the box (FIG. 5).
(C), see FIG. 6). Thereafter, the top surface of the outer box is closed by the inner top flaps 2a and 2c and the outer top flaps 2b and 2d, and these flaps are bonded or taped with an adhesive to complete the packaging. Also in this case, if necessary, a coolant or the like can be stored in the interior box or in the gap 23.

As described above, the present invention is characterized in that a member for forming a predetermined gap (air layer having low thermal conductivity) is provided integrally with the interior box between the exterior box and the interior box. I have. That is, in the first embodiment, the air layer 13 having low thermal conductivity is formed by providing a predetermined gap between the overhang portion X of the abutting member and the vertical direction and the front-back direction of the box. In the second embodiment, the left and right overhanging portions Y of the side panels, the upward projections 35a, 35b, and the legs 34a,
Although the air layer 23 having low thermal conductivity is formed on the six surfaces of the box by the front and rear overhang portions Z of the top panel, the present invention is not limited to this, and is provided between the outer box and the inner box. Clearances at predetermined intervals (air layers with low thermal conductivity) may be provided on at least four sides of the box. With this gap, if an air layer having low thermal conductivity is formed between the inner and outer boxes, it is possible to confine the cold air in the double box by itself and prevent the packaged object from being exposed to room temperature. The cooling effect and the cooling time can be improved.

[0028]

The container of the present invention as described above can be stored in a flat folded state before use, and the assembly is simpler and easier to assemble than the conventional double wall paper container. At the time of use, cold or warm air is sealed in a double box, so that the packaged items are not exposed to room temperature, and the thermal insulation and cooling effect and the thermal insulation time of the packaged items can be greatly improved. As a result, a heat-retaining and cooling effect comparable to that of a resin molded container such as styrene foam can be obtained. In addition, the processing cost is lower than that of the conventional paper container, and the recycled paper after use is easier than the resin molded container, and there is less problem of environmental pollution at the time of disposal.

[Brief description of the drawings]

FIGS. 1A and 1B are exploded views of an outer box and an inner box used in one embodiment of the present invention.

FIGS. 2A to 2E are explanatory diagrams showing an assembling order of the double box of the embodiment.

FIG. 3 is a perspective view showing a main part of the double box after assembling according to the embodiment, which is partially cut away.

FIG. 4A is a development view of an interior box used in a second embodiment of the present invention, and FIG. 4B is a view of a bottom pad when a bottom pad is inserted.

FIGS. 5A to 5D are explanatory views showing an assembling order of the double box of the second embodiment.

FIG. 6 is a perspective view of the double box according to the above-described embodiment, in which main parts are cut away.

[Explanation of symbols]

 1a, 1b, 1c, 1d Side plate 2a, 2b, 2c, 2d flap 3a, 3b, 3c, 3d flap 4a, 4b, 4c, 4d Panel 5a, 5b, 5c, 5d flap 6a, 6b, 6c, 6d flap 7a, 7b, 8a, 8b Butt member 11, 21 Outer box 12, 22 Inner box 13, 23 Crevice (air layer with low thermal conductivity) 30 Bottom panel 31, 32 Side panel 34a, 34b Leg 35a, 35b Projection 37 Top surface Panel 38 Notch 40 Bottom pad

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3E060 AA03 AB05 AB32 BA03 BB03 BB05 BC02 BC04 BC08 CG03 DA21 DA23 DA24 DA25 EA06 EA12 EA13 3E067 AB02 AB04 AB05 AB06 AB08 AB09 BA06A BA06B BA06C BB02A BB02B BB02BBBA14 GA12

Claims (5)

[Claims] 1. A double box comprising an outer box made of paper such as cardboard and an inner box provided inside the outer box, wherein the outer box and the inner box are assembled from separate blank sheets, respectively. A paper-made heat insulation and cooling case, characterized in that a member forming a gap at a predetermined interval is provided on the interior box side between the interior box and the interior box, and an air layer is formed between the inner and outer boxes. 2. The double box is formed from a corrugated cardboard sheet, and at least one of inner and outer boxes forming the double box is
The paper-made heat insulating and cooling case according to claim 1, which is formed of a cardboard sheet subjected to a water-repellent treatment or a waterproof treatment. 3. The double box is formed of a corrugated cardboard sheet, and at least one of inner and outer boxes forming the double box is
The paper-made heat insulation and cooling case according to claim 1, wherein a heat reflection film or a heat insulation film is laminated on the intermediate layer of the liner or on the surface of the liner. 4. The interior box is provided with four lines in one direction through ruled lines.
Panels 4a, 4b, 4c, 4d and body flap 4
e, and the four flaps 5a, 5c, 6 in the seal end are vertically arranged perpendicularly to the direction in which the four panels are connected.
a, 6c and four seal end outer flaps 5b, 5b
d, 6b, and 6d are connected to each other, and at the time of assembling, the outer flap seal end is used by abutting each other on the inner flap seal end.
a, 7b, 8a, and 8b are integrally connected, and when these abutting members are folded back to the outside of the seal end outer flap, they protrude outside the flap, and the right and left side plates 1a, 1c of the outer box. It consists of a blank sheet that fits in the inner dimensions and is set to about half the size, and when the blank sheet is assembled and used, the abutment members are brought into contact with the left and right inner side surfaces of the outer box, so that the outer box and the inner A gap is provided between the box and the box in a vertical direction and a front-rear direction to form an air space with a predetermined gap.
3. The paper-made heat insulating / cooling case according to any one of (3). 5. The interior box includes a pair of side panels 31 and 31 on two long sides of a rectangular bottom panel 30 and a pair of side panels 32 and 32 on two short sides via a ruled line. And the side panels 31 on the long side are connected to the bottom panel 3.
The length of the side adjacent to 0 is formed so as to protrude on both sides of the bottom panel 30 so as to be larger than the long side of the bottom panel 30, and near the boundary between the bottom panel 30 and the side panels 31, 31. A pair of cuts 33a, 33b cut into the bottom panel 30 are provided,
A pair of legs 34a, 34b is formed on 31 respectively, and a pair of projections 35a, 35b protruding upward are formed on the upper edges of the side panels 31, 31, respectively, on the extension of the other side panels 32, 32. Top panel 37, 3
7 and the top panels 37, 37 have sides adjacent to the side panels 32, 32, the length of which is adjacent to the side panels 32, 32.
Are formed so as to protrude from both sides of the sides of the side panels 32, 32 so as to be longer than the length of the sides of the side panels 31, and a pair of projections 35a, 35b, a blank sheet provided with a notch 38 that engages with the inner box 35b. At the time of assembling and using the blank sheet, a predetermined distance is provided between the outer box and the inner box in the top, bottom, front and rear, and left and right directions of the box. 2. An air layer is formed by providing a gap between the air layers.
4. The paper-made heat insulating and cooling case according to any one of items 1 to 3.