JP2020132237A - Heat insulating container using vacuum heat insulating material - Google Patents

Abstract

To provide a heat insulating container using a vacuum heat insulating material which can overcome a problem that the heat insulating performance of the heat insulating container is low due to heat flowing in and out through an elastic member used for a gap and a gap generated between the vacuum heat insulating materials, and heat flowing in and out through a heat insulating material other than the vacuum heat insulating material used for reducing the gap.SOLUTION: A heat insulating container includes: a first vacuum heat insulating material having an end portion, a central portion thicker than the end portion, and a thickness change portion which exists between the end portion and the central portion and whose thickness continuously changes; and a flat second vacuum heat insulating material whose end is in contact with the thickness change portion of the first vacuum heat insulating material.SELECTED DRAWING: Figure 1

Description

The present invention relates to a heat insulating container for packing used for transporting a package such as blood, a drug, or a sample that needs to be kept cold or warm.

A packaging container for transporting a package that requires cold or heat insulation has conventionally been configured to include a heat insulating material such as a foam in order to minimize the influence of the temperature outside the container on the package.

Further, in order to maintain the load at the target temperature, it is preferable that the load does not use an external power source from the viewpoint of portability, and generally, a phase change material adjusted to change the phase at the target temperature is used.

By arranging the phase change material inside the heat insulating container, it becomes a packing container that is excellent in portability and can thermally protect the luggage from a low or high temperature outside (Patent Document 1).
The time during which the luggage packed inside the heat insulating container can be maintained at the target temperature is affected by the weight of the phase change material and the heat insulating performance of the heat insulating container in addition to the outside air temperature.

By increasing the weight of the phase change material, the luggage inside the heat insulating container can be maintained at the target temperature for a relatively long time, but there is a problem that the weight of the luggage including the container becomes heavy, so vacuum heat insulating material is used for the heat insulating container. , A configuration with improved heat insulation performance of the heat insulating container has been proposed. (Patent Document 2)
However, in the heat insulating container using the vacuum heat insulating material, heat inflow and outflow becomes large due to the gap generated at the joint between the vacuum heat insulating materials. Therefore, for the purpose of reducing this, the joint between the vacuum heat insulating materials is used. , A method using an elastic member has also been proposed. (Patent Document 3)
In addition, by using a vacuum heat insulating material and a multi-layer material other than the vacuum heat insulating material with good moldability, the heat insulating materials are fitted together to form a shape, and heat flows in and out at the joint between the vacuum heat insulating materials. A method for reducing the amount of heat is also proposed. (Patent Document 4)

Special Table 2010-525996 Japanese Unexamined Patent Publication No. 2016-222271 Japanese Unexamined Patent Publication No. 2017-141053 Japanese Patent No. 5435435

However, in the content described in Patent Document 3, the heat insulating performance of the heat insulating container is generally improved by using the vacuum heat insulating material as the heat insulating material and filling the gaps generated between the vacuum heat insulating materials with elastic members. In addition, the thermal conductivity of the elastic member is lower than that of the vacuum heat insulating material, and the amount of heat flowing in and out through the portion where the vacuum heat insulating materials are in contact still has a big problem.

Furthermore, since the heat insulating container is usually designed in consideration of workability during assembly and disassembly of the heat insulating container and interference between panels, the thickness of the elastic member generally arranged between the vacuum heat insulating materials is used. There is a problem that the amount of heat flowing in and out through the elastic member is further increased in order to increase the thickness.

The content described in Patent Document 4 has a problem that the wall thickness of the heat insulating container becomes thick and the floor area ratio of the heat insulating container decreases because it is configured by combining a heat insulating board other than the vacuum heat insulating material having high heat insulating performance. are doing.

The present invention is for solving the above-mentioned problems, and is a thickness changing portion that exists between an end portion, a central portion thicker than the end portion, and the end portion and the central portion, and the thickness thereof continuously changes. It is a heat insulating container characterized by including the first vacuum heat insulating material having the above, and a flat plate-shaped second vacuum heat insulating material whose end is in contact with the thickness changing portion of the first vacuum heat insulating material.

On the surface of the vacuum heat insulating material, there are irregularities of glass wool mainly used for the core material of the vacuum heat insulating material and fine wrinkles generated on the outer cover material of the vacuum heat insulating material in the manufacturing process, but they are arranged inside the heat insulating container. By arranging the vacuum heat insulating materials so that the second vacuum heat insulating material is in contact with the thickness change portion of the first vacuum heat insulating material, the vacuum heat insulating materials are in line contact with each other. The load is concentratedly applied to the portion in contact with the vacuum heat insulating material, and the surface of the vacuum heat insulating material follows the irregularities and wrinkles generated on the surface of the vacuum heat insulating material, so that the gap can be significantly reduced.

It is possible to reduce the gap by making the portion where the heat insulating materials in contact are joined into a tapered shape, but since it is strongly affected by the unevenness and wrinkles generated on the surface of the vacuum heat insulating material, the description means of the present invention. According to this, the gap between the vacuum heat insulating materials can be further reduced.

According to the means of the present invention, since the vacuum heat insulating material has a portion whose thickness continuously changes, for example, when the heat insulating container can be assembled or the vacuum heat insulating material can be replaced, the thickness changing portion As a result, the position of the vacuum heat insulating material placed inside the heat insulating container is restricted, so that workability at the time of assembling the heat insulating container can be expected to be improved.

Further, since a heat insulating member other than the vacuum heat insulating material is not required to form the fitted shape, the floor area ratio of the heat insulating container can be improved.

According to the present invention, the heat insulating performance and the floor area ratio of the heat insulating container using the vacuum heat insulating material can be improved, and when the cargo requiring cold insulation or heat insulation is packed in the heat insulating container and transported, the cargo including the heat insulating container is lightened. Moreover, it can be transported to remote areas that require a long transportation time.

Schematic of a cross section of a heat insulating container according to the first embodiment of the present invention. Schematic diagram of the cross section of the heat insulating container in Example 1 of the present invention. Schematic diagram of the vacuum heat insulating material arranged at the bottom of the heat insulating container in Example 1 of the present invention. Schematic diagram of the vacuum heat insulating material arranged on the side surface of the heat insulating container in Example 1 of the present invention. Schematic diagram of the vacuum heat insulating material arranged on the side surface of the heat insulating container in Example 1 of the present invention. Schematic of a cross section of a heat insulating container according to a second embodiment of the present invention. Schematic of a cross section of a heat insulating container according to a second embodiment of the present invention. Schematic diagram of the cross section of the heat insulating container in Example 2 of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to figures and tables.
(First Embodiment)
FIG. 1 is a schematic cross-sectional view of a heat insulating container according to the first embodiment of the present invention.

The heat insulating container 1 has a space portion 2 for accommodating an article inside, and the space portion 2 is formed by arranging the vacuum heat insulating material 3 inside the outer box 4.

In the vacuum heat insulating material 3, the core material (not shown) is covered with an outer cover material (not shown) made of a gas impervious material, and the pressure inside the outer cover material is lower than the atmospheric pressure. It is decompressed to pressure.

At least one of the vacuum heat insulating materials 3 exists between the end portion 5, the central portion 6 thicker than the end portion 5, and the end portion 5 and the central portion 6, and the thickness thereof continuously changes. It has a changing part 7.

The outer box 4 only needs to be able to hold the vacuum heat insulating material 3 inside, and for example, a resin case or a cardboard case can be used.

At least two vacuum heat insulating materials 3 arranged inside the outer box 4 are in contact with the thickness changing portion 7 of the vacuum heat insulating material 3 having the thickness changing portion 7 and the end portion 5 of the other vacuum heat insulating material 3. Is placed.

With the above configuration, the end 5 of the vacuum heat insulating material 3 and the thickness changing portion 7 are in contact with each other by a line, as compared with the case where they are in contact with each other on a flat surface or through an elastic member. Since the force is concentrated on the contact portion between the vacuum heat insulating materials 3, the surfaces of the two vacuum heat insulating materials 3 in contact are deformed following the wrinkles and irregularities of the surfaces of the vacuum heat insulating materials 3. However, the gap between the vacuum heat insulating materials 3 that deteriorates the heat insulating performance of the heat insulating container 1 is significantly reduced.

Further, since the thickness of the thickness changing portion 7 is continuously changing, when the heat insulating container 1 can be disassembled and assembled, when the vacuum heat insulating material 3 is assembled inside the outer box 4 at the time of assembling the heat insulating container 1. Since the position of the vacuum heat insulating material 3 after assembly is restricted to the outer box 4 side by the thickness changing portion 7, the workability of assembly can be significantly improved.

In the present embodiment, only one place of the vacuum heat insulating materials 3 is in contact with the combination of the thickness changing portion 7 and the end portion 5, but by appropriately arranging the thickness changing portion 7, all the vacuums are vacuumed. The contact portion between the heat insulating materials 3 can be brought into contact with the thickness changing portion 7 and the end portion 5.
(Example 1)
Next, the heat insulating container 1 in the first embodiment will be described.

FIG. 2 is a schematic cross-sectional view of the heat insulating container 1 used in this embodiment as viewed from above.

The outer box 4 was made of corrugated cardboard having a thickness of 5 mm.

The outer dimensions of the outer box 4 are width 400 mm, depth 400 mm, and height 350 mm.
A foam material 8 was arranged inside the outer box 4 for the purpose of stabilizing the measurement of this embodiment. Foamed polystyrene was used as the foam material 8, and all six inner surfaces of the outer box 4 were arranged with a thickness of 25 mm without any gaps.

The vacuum heat insulating material 3 was arranged on a total of 6 surfaces inside the foam material 8.

Then, the cold storage material 9 was arranged on the inner surface of the vacuum heat insulating material 3.

A total of four cold storage materials 9 were arranged.

Two of the cold storage materials 9 were arranged so as to be in contact with the two side surfaces of the vacuum heat insulating material 3.

Of the remaining two of the cold storage materials 9, one is in contact with the vacuum heat insulating material 3 arranged at the bottom, and the remaining one is in contact with the vacuum heat insulating material 3 arranged on the top surface. I got it.

Next, a total of six vacuum heat insulating materials 3 arranged on six surfaces inside the foam material 8 arranged inside the outer box 4 will be sequentially described.

First, the vacuum heat insulating material 3 used for the bottom surface will be described.

FIG. 3 shows a schematic view of the vacuum heat insulating material 3 used for the bottom surface.

The vacuum heat insulating material 3 was created by inserting the core material 11 and the moisture adsorbent 12 into the gas barrier outer cover material 10 and reducing the pressure inside the outer cover material 10.

Glass wool was used as the core material 11. The size of the core material 11 was 340 mm in width and 340 mm in depth, and the weight was 592 g.

As the outer cover material 10, a multilayer film in which a polyethylene terephthalate layer, an aluminum layer, and a polypropylene layer were laminated and the total thickness was 100 μm was used.

In this embodiment, a multi-layer film made of the above resin and aluminum foil is used, but other materials may be used as long as they have gas barrier properties.

The two films were formed into a bag shape by facing the polypropylene layers and heat-welding the peripheral edges.

As the water adsorbent 12, 20 g of calcium oxide powder was used.

After molding the entire thickness of the vacuum heat insulating material 3 to 24 mm using a press machine, the thickness is increased to 15 mm by using a press machine over the entire circumference of the width of 10 mm from the edge of the peripheral portion of the vacuum heat insulating material 3. The molded thin-walled portion 13 was formed. The thickness changing portion 7 was formed only on one side of the vacuum heat insulating material 3.

As a result, the thickness of the central portion 6 and the end portion 5 was changed, and the thickness changing portion 7 was formed between the central portion 6 and the end portion 5.

The thermal conductivity of the vacuum heat insulating material 3 after the molding was set to 2.3 mW / m · K.

The arrangement of the vacuum heat insulating material 3 inside the outer box 4 is such that the surface of the vacuum heat insulating material 3 opposite to the side where the thickness changing portion 7 is located is in contact with the foam material 8 covering the bottom surface side of the outer box 4. Placed.

Next, a total of four vacuum heat insulating materials 3 used on the side surfaces will be described with reference to FIGS. 4 and 5.

The vacuum heat insulating material 3 shown in FIG. 4 is the same as the vacuum heat insulating material 3 used for the bottom surface except for the dimensions.

The dimensions of the vacuum heat insulating material 3 shown in FIG. 4 are 340 mm in width and 250 mm in depth, and after molding the entire thickness of the vacuum heat insulating material 3 to 24 mm, a press machine is used for two sides having a length of 250 mm. The thickness was molded to 15 mm to form the thin portion 13.

As a result, the thickness changing portion 7 in which the thickness of the central portion 6 and the end portion 5 continuously changes is formed. The thickness changing portion 7 was formed only on one side of the vacuum heat insulating material 3.

The thermal conductivity of the vacuum heat insulating material 3 after the molding was 2.5 mW / m · K.

The vacuum heat insulating material 3 shown in FIG. 5 is the same as the vacuum heat insulating material 3 shown in FIG. 3 used for the bottom surface except for the dimensions.

The dimensions of the vacuum heat insulating material 3 shown in FIG. 5 were 300 mm in width and 250 mm in depth, and the total thickness of the vacuum heat insulating material 3 was molded to 24 mm.

The thermal conductivity of the vacuum heat insulating material 3 after the molding was 2.5 mW / m · K.

Two vacuum heat insulating materials 3 shown in FIG. 4 and two vacuum heat insulating materials 3 shown in FIG. 5 are arranged on the inner surface of the foam material 8 arranged inside the outer box 4. did.

When arranging, the two vacuum heat insulating materials 3 shown in FIG. 4 were arranged so that the surface without the thickness changing portion 7 was in contact with the foam material 8.

The total of four vacuum heat insulating materials 3 arranged on the side surface were arranged perpendicular to the vacuum heat insulating material 3 arranged at the bottom so as to be in contact with the vacuum heat insulating material 3 arranged at the bottom at the side of 340 mm.

Further, as shown in FIG. 2, the positional relationship between the four vacuum heat insulating materials 3 is such that the vacuum heat insulating materials 3 having the thickness changing portions 7 shown in FIG. 4 do not come into contact with each other. 3 and the vacuum heat insulating material 3 shown in FIG. 5 were arranged so as to be in contact with each other. This means that all the vacuum heat insulating materials 3 arranged on the side surface are arranged so that the thickness changing portion 7 and the end portion 5 are in contact with each other.

Inside the outer box 4 in which the foam material 8 was arranged as described above, the vacuum heat insulating material 3 was arranged on the bottom and the side surface, and then the vacuum heat insulating material 3 was arranged on the top surface.

The vacuum heat insulating material 3 arranged on the top surface was the same as the vacuum heat insulating material 3 arranged on the bottom as shown in FIG.

The vacuum heat insulating material 3 arranged on the top surface was arranged so that the thickness changing portion 7 was in contact with the end portion 5 of the vacuum heat insulating material 3 arranged on the side surface.

Finally, a total of four cold storage materials 9 used will be described.

As the material of the cold storage material 9, paraffin having a melting point of 4 ° C. was used. The weight was 800 g, and the one covered with a gas barrier resin multilayer material was used. The size used was 200 mm in width and 300 mm in depth.

The cold storage material 9 was cooled at −25 ° C. for 24 hours or more, and then placed inside the heat insulating container 1. As described above, a total of four cold storage materials 9 are arranged inside the heat insulating container 1, two of which are arranged so as to be in contact with the two side surfaces of the vacuum heat insulating material 3, and one is at the bottom. It was arranged so as to be in contact with the vacuum heat insulating material 3 arranged in the above, and the remaining one was arranged so as to be in contact with the vacuum heat insulating material 3 arranged on the top surface.

For measurement, for one of the two cold storage materials 9 arranged on the vacuum heat insulating material 3 on the side surface, a thermocouple for measuring the temperature of the surface on the space 2 side for accommodating the article (in the figure). (Not described) was placed.

The heat insulating container 1 having the above configuration was left in a constant temperature room at 30 ° C., and the time from the leaving to the temperature of the thermocouple exceeding 7 ° C. was measured.

Since the cold storage material 9 has a melting point of 4 ° C., the time until the solid cold storage material 9 cooled at −25 ° C. for 24 hours is completely melted by measuring the time until the temperature exceeds 7 ° C. Can be indirectly evaluated, and further, the heat insulating performance of the heat insulating container 1 can be evaluated.

As a result, the time from when the heat insulating container 1 was left in a constant temperature room at 30 ° C. until the temperature of the thermocouple exceeded 7 ° C. was 80 hours.
(Comparative Example 1)
Next, Comparative Example 1 will be described.

The heat insulating container 1 used in Comparative Example 1 is the same as in Example 1 except for the shape of the vacuum heat insulating material 3.

In this comparative example, the vacuum heat insulating material 3 used for the bottom of the foam material 8 arranged on the inner surface of the outer box 4 has the core material 11 and the moisture inside the gas barrier outer cover material 10 as in the first embodiment. The adsorbent 12 was inserted and the inside of the outer cover material 10 was depressurized.

Glass wool was used for the core material 11, and the size of the core material 11 was 340 mm in width and 340 mm in depth, and the weight was 592 g.

As the outer cover material 10, a multilayer film in which a polyester terephthalate layer, an aluminum layer, and a polypropylene layer were superposed to have a total thickness of 100 μm was used. In this embodiment, a multi-layer film made of resin and aluminum foil is used as described above, but other materials may be used as long as they have gas barrier properties.

The two films were formed into a bag shape by facing the polypropylene layers and heat-welding the peripheral edges.

As the water adsorbent 12, 20 g of calcium oxide powder was used.

After depressurizing the inside of the outer cover material 10 of the vacuum heat insulating material 3, the total thickness of the vacuum heat insulating material 3 was molded to 24 mm by a press machine.

The thermal conductivity of the vacuum heat insulating material 3 after the molding was set to 2.3 mW / m · K.

The vacuum heat insulating material 3 was arranged so that the flat surface of the vacuum heat insulating material 3 was in contact with the inner surface of the foam material 8 arranged on the inner surface of the outer box 4.

Next, the vacuum heat insulating material 3 used for the side surface of the foam material 8 arranged on the inner surface of the outer box 4 in this comparative example will be described.

The vacuum heat insulating material 3 used for the side surface is the same as the vacuum heat insulating material 3 used for the bottom in Comparative Example 1 above, except for the dimensions.

The dimensions of the vacuum heat insulating material 3 used for the side surface are such that the width is 315 mm and the depth is 302 mm, the inside of the outer cover material 10 of the vacuum heat insulating material 3 is depressurized, and then the thickness is adjusted by a press machine to the entire vacuum heat insulating material 3. The thickness of the was molded to 24 mm, and the thermal conductivity was 2.3 mW / m · K.

A total of four vacuum heat insulating materials 3 used on the side surfaces in this comparative example, and a total of four inner surfaces of the foam material 8 arranged on the inner surface of the outer box 4 so that the flat surface of the vacuum heat insulating material 3 is in contact with the four side surfaces. Placed.

Further, the vacuum heat insulating material 3 used on the side surface was arranged so that the vacuum heat insulating material 3 on the top surface and the bottom surface and the side of the vacuum heat insulating material 3 used on the side surface had a width of 315 mm were in contact with each other.

Next, the vacuum heat insulating material 3 used for the top surface of the foam material 8 arranged on the inner surface of the outer box 4 in this comparative example will be described.

As the vacuum heat insulating material 3 used for the top surface, the same vacuum heat insulating material 3 used for the bottom surface in this comparative example was used.

The arrangement inside the heat insulating container 1 was such that the flat surface of the vacuum heat insulating material 3 used for the top surface was in contact with a total of four side surfaces of the inner surface of the foam material 8 arranged on the inner surface of the outer box 4.

Similar to Example 1, the heat insulating container 1 having the above configuration is left in a constant temperature room at 30 ° C., and then the temperature of the surface of the cold storage material 9 arranged in contact with the vacuum heat insulating material 3 arranged on the side surface is changed. The time until the temperature exceeded 7 ° C. was measured.

As a result, the time from when the heat insulating container 1 was left in a constant temperature room at 30 ° C. until the surface temperature of the cold storage material 9 exceeded 7 ° C. was 53 hours.

In the first embodiment, the thickness changing portion 7 of the vacuum heat insulating material 3 constituting the heat insulating container 1 is arranged so as to be in contact with the end portion 5 of the vacuum heat insulating material 3, but in this comparative example, the vacuum heat insulating material 3 constituting the heat insulating container 1 is arranged. There is no thickness changing portion 7, and the contact between the vacuum heat insulating materials 3 is arranged so that the surface of the vacuum heat insulating material 3 and the end portion 5 of the vacuum heat insulating material 3 are in contact with each other. The time from when the heat was left in the thermostatic chamber at 30 ° C. until the temperature of the heat insulating material 9 arranged on the side surface exceeded 7 ° C. was 80 hours in Example 1, whereas in this comparative example it was 53 hours. It became shorter.

The difference in time is a size that cannot be explained by the difference in thermal conductivity between the vacuum heat insulating material 3 of Example 1 and Comparative Example 1.

This means that the contact method of the plurality of vacuum heat insulating materials 3 constituting the heat insulating container 1 of the present invention is the end portion 5 of the first vacuum heat insulating material 3 and the end portion of the second vacuum heat insulating material 3. It means that the heat insulating performance of the heat insulating container 1 is improved by arranging the thickness changing portion 7 which exists between the central portion 5 and the central portion 6 and whose thickness continuously changes.
(Second Embodiment)
FIG. 6 is a schematic cross-sectional view of the heat insulating container 1 used in the second embodiment of the present invention.

The main configuration is the same as that of the first embodiment, but among the vacuum heat insulating materials 3 constituting the heat insulating container 1, the soft material 14 is compressed between the vacuum heat insulating material 3 having the thickness changing portion 7 and the outer box 4. And placed.

In order to restore the compressed soft material 14, the force that spreads the outer box 4 outward and the force that the vacuum heat insulating material 3 having the thickness changing portion 7 in contact with the soft material 14 is pushed toward the space portion 2. Works. Since the vacuum heat insulating material 3 having the thickness changing portion 7 is arranged in contact with another vacuum heat insulating material 3, the thickness changing portion 7 of the vacuum heat insulating material 3 having the thickness changing portion 7 and another vacuum heat insulating material 3 A load is applied to the portion in contact with the end portion 5 of the.

As a result, the gap between the vacuum heat insulating material 3 in contact between the thickness changing portion 7 and the end portion 5 exerts a more concentrated force on the contact portion between the vacuum heat insulating materials 3 as compared with the first embodiment. Because of the addition, the surfaces of the two vacuum heat insulating materials 3 that come into contact with each other follow the wrinkles and irregularities of the surfaces of the vacuum heat insulating materials 3 and are deformed more greatly, so that the heat insulating performance of the heat insulating container 1 is deteriorated. The gap between the vacuum heat insulating materials 3 can be further reduced.

Further, since the compressed soft material 14 always applies a load toward the space portion 2 of the vacuum heat insulating material 3, the vacuum heat insulating material 3 arranged inside the outer box 4 can be reliably fixed.

In the present embodiment, the vacuum heat insulating materials 3 are in contact with each other only at one place by the combination of the thickness changing portion 7 and the end part 5, but the contact points are not limited to this, for example, all the vacuum heat insulating materials 3 The contact portions may be the arrangement and dimensions of the vacuum heat insulating material 3 in which the thickness changing portion 7 and the end portion 5 are in contact with each other.

In the present embodiment, the soft material 14 is arranged at only one place, but the restoring force of the compressed soft material 14 is exerted by the end portion of the vacuum heat insulating material 3 and the thickness changing portion 7 of another vacuum heat insulating material 3. A plurality of soft materials 14 may be arranged within a range in which a load is applied to the contacting positions.

Further, in the present embodiment, the soft material 14 is arranged between the thickness changing portion 7 and the outer box 4, but the restoring force of the compressed soft material 14 is different from that of the end portion of the vacuum heat insulating material 3. The soft material 14 may be arranged at another position within the range in which the load is applied to the position where the thickness changing portion 7 of the vacuum heat insulating material 3 comes into contact.

Further, in the present embodiment, the soft material 14 is used, but for example, the outer box 4 is made elastic, and the dimensions of the outer box 4 are adjusted so that the vacuum heat insulating material 3 is added with fruit juice in the direction of the space portion 2. It is also possible to replace the function of the soft material 14 with another material constituting the heat insulating container 1, such as making the size smaller.
(Example 2)
FIG. 7 shows a schematic cross-sectional view of the heat insulating container 1 used in the second embodiment of the present invention.

The main configuration is as in Example 1, but the soft material 14 is arranged between the vacuum heat insulating material 3 arranged on the top surface and the foam material 8 shown in the upper part of the figure.

As the material of the soft material 14, a urethane foam material having a width of 300 mm, a depth of 300 mm, and a thickness of 10 mm was used.

According to the above dimensions and configuration, the soft material 14 originally having a thickness of 10 mm was compressed between the vacuum heat insulating material 3 and the foam material 8 and arranged on the top and bottom vacuum heat insulating materials 3 and the side surfaces. A load is applied to the contact portion of the vacuum heat insulating material 3 in the direction of stronger contact.

As a result, the surface of the vacuum heat insulating material 3 at the contact portion between the vacuum heat insulating materials 3 is deformed following the wrinkles and irregularities of the surface of each vacuum heat insulating material 3, and the heat insulating performance of the heat insulating container 1 is improved. The gap between the vacuum heat insulating materials 3 that deteriorates is further reduced as compared with Example 1.

Similar to Example 1, the heat insulating container 1 having the above configuration is left in a constant temperature room at 30 ° C., and then the temperature of the surface of the cold storage material 9 arranged in contact with the vacuum heat insulating material 3 arranged on the side surface is changed. The time until the temperature exceeded 7 ° C. was measured.

As a result, the time from when the heat insulating container 1 was left in a constant temperature room at 30 ° C. until the surface temperature of the cold storage material 9 exceeded 7 ° C. was 84 hours.

This means that, as compared with the result of Example 1, the time from when the heat insulating container 1 is left in a constant temperature room at 30 ° C. until the surface temperature of the cold storage material 9 exceeds 7 ° C. is extended by 4 hours. Although the soft material 14 also functions as a heat insulating material, the thickness when compressed is much thinner than that of the vacuum heat insulating material 3, and the heat insulating performance of the soft material 14 itself is much higher than that of the vacuum heat insulating material 3. Since it is low, the difference of 4 hours indicates that the gap between the contact portions of the vacuum heat insulating materials 3 is reduced.

By configuring the soft material 14, the heat insulating performance of the heat insulating container 1 can be improved.

(Third Embodiment)
FIG. 8 is a schematic cross-sectional view of the heat insulating container 1 used in the second embodiment of the present invention.

The main configuration is the same as that of the first embodiment, but among the vacuum heat insulating materials 3 constituting the heat insulating container 1, the elastic member from the end 5 to the thickness changing portion 7 of the vacuum heat insulating material 3 having the thickness changing portion 7. 15 were placed.

The elastic member 15 can be made of any elastic, sheet-like material such as foamed urethane or a rubber-based material.

With the above configuration, the elastic member 15 sandwiched between the end portion 5 of the vacuum heat insulating material 3 and the thickness changing portion 7 that come into contact with each other inside the outer box 4 has a flat portion of the vacuum heat insulating material 3 as in the conventional example. Since the force is applied intensively as compared with the case where the elastic member 15 is compressed, the elastic member 15 can be compressed more, and the thickness of the elastic member 15 can be made thinner.

This means that, for example, when the elastic member 15 is arranged at the end 5 of the vacuum heat insulating material 3 and the flat surface of the end 5 and the vacuum heat insulating material 3 is brought into contact with each other via the elastic member 15, the elastic member 15 is vacuumed. Compared to the case where the heat insulating material 3 is brought into contact with the heat insulating material 3 in a flat surface, in the present embodiment, the thickness of the elastic member 15 having poor thermal conductivity can be made thinner than that of the vacuum heat insulating material 3, so that the material flows in and out through the elastic member 15. The amount of heat generated can be reduced, and the heat insulating performance of the heat insulating container 1 can be improved.

Further, since the elastic member 15 significantly reduces the gap between the vacuum heat insulating materials 3 that deteriorates the heat insulating performance of the heat insulating container 1, the heat insulating performance of the heat insulating container 1 can be improved.

In the present embodiment, the elastic member 15 is arranged not only in the thickness changing portion 7 but also in the thin-walled portion 13, but the inflow and outflow of heat is mainly in the gap between the vacuum heat insulating materials 3 arranged inside the heat insulating container 1. The position of the elastic member 15 may be changed within the range where the vacuum heat insulating materials 3 are in contact with each other.
(Example 3)
Next, Example 2 of the present invention will be described with reference to FIG.

The main configuration is as in Example 1, but in the vacuum heat insulating material 3 used, after covering all of the thickness changing portion 7 and the thin wall portion 13 with an elastic member (not shown), the inside of the heat insulating container 1 is used. Placed in.

As the elastic member, a foamed polyethylene sheet was used. The thickness was 1 mm.

An adhesive tape made of polypropylene was used to fix the elastic member to the vacuum heat insulating material 3.

According to the above dimensions and configuration, the vacuum heat insulating material 3 comes into contact with the inside of the heat insulating container 1 via the elastic member, applies strong compression to the elastic member, reduces the thickness of the elastic member, and vacuum heat insulating. Since the surface of the material 3 is deformed following the unevenness and wrinkles of the vacuum heat insulating material 3, the amount of heat flowing in and out through the gaps of the portions where the vacuum heat insulating materials 3 come into contact can be significantly reduced.

Similar to Example 1, the heat insulating container 1 having the above configuration is left in a constant temperature room at 30 ° C., and then the temperature of the surface of the cold storage material 9 arranged in contact with the vacuum heat insulating material 3 arranged on the side surface is changed. The time until the temperature exceeded 7 ° C. was measured.

As a result, the above time was 90 hours.

Compared with the result of Example 1, the above result shows that the time from when the heat insulating container 1 is left in a constant temperature room at 30 ° C. until the surface temperature of the cold storage material 9 exceeds 7 ° C. is extended by 9 hours. This indicates that the vacuum heat insulating material 3 has a reduced gap between the contact portions.

By arranging the elastic members in the thickness changing portion 7 and the thin-walled portion 13, the heat insulating performance of the heat insulating container 1 can be improved.

In this embodiment, the elastic member is arranged not only in the thickness changing portion 7 but also in the thin wall portion 13, but the inflow and outflow of heat mainly occurs in the gap between the vacuum heat insulating materials 3 arranged inside the heat insulating container 1. Therefore, the place where the elastic member is arranged need only be the place where the vacuum heat insulating materials 3 are in contact with each other.

The present invention is a vacuum heat insulating material generated when a vacuum heat insulating material having high heat insulating performance is used for a heat insulating container for packing used when transporting a package such as blood, chemicals, or a sample that needs to be kept cold or warm. The gap between the joint surfaces can be reduced, and both the heat insulating performance and the floor area ratio of the heat insulating container are improved.

1 Insulation container 2 Space part 3 Vacuum heat insulating material 4 Outer box 5 End part 6 Central part 7 Thickness change part 8 Foam material 9 Cold storage material 10 Outer cover material 11 Core material 12 Moisture adsorbent 13 Thin wall part 14 Soft material 15 Elastic member

Claims (4)

A first vacuum heat insulating material having an end portion, a central portion thicker than the end portion, and a thickness changing portion existing between the end portion and the central portion and whose thickness continuously changes, and a first vacuum heat insulating material. A heat insulating container including a flat plate-shaped second vacuum heat insulating material whose end is in contact with the thickness changing portion of the heat insulating material. A heat insulating container further including a first vacuum heat insulating material and an outer box outside the second vacuum heat insulating material. Of the vacuum heat insulating materials placed inside the outer box
A soft material is placed on the outer box side of at least one vacuum heat insulating material,
The heat insulating container according to claim 1 to 2, wherein the soft material is compressed between the outer box and the vacuum heat insulating material. The heat insulating container according to claim 1 to 3, wherein an elastic member is provided at a portion where a plurality of vacuum heat insulating materials arranged inside the outer box come into contact with each other.

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