JP2023001433A - Latent heat storage material, cold keeper, distribution packaging container and food cold keeper - Google Patents

Abstract

To provide a latent heat storage material that can be solidified at -20°C or higher and enables a cold insulation object such as a frozen food to be kept at -18°C or lower.SOLUTION: A latent heat storage material contains 3.5-22.5 pts.wt. of ammonium chloride, 6.5-25.5 pts.wt. of ammonium bromide, and water. The ammonium chloride, ammonium bromide and water total 100 pts.wt. It has a thawing initiation temperature in a range of -18°C to -20°C.SELECTED DRAWING: Figure 4

Description

TECHNICAL FIELD The present disclosure relates to a latent heat storage material, a cold insulator, a physical distribution packing container, and a food cold insulator.

When frozen food is transported, in many cases, the frozen food is packed in a physical distribution container, and the physical distribution container packed with the frozen food is transported.

In order to maintain the quality of frozen food when it is transported, frozen food must be kept cold at least below freezing point. It is desirable to keep the temperature below 18°C. However, until now, dry ice has been used to transport frozen foods regardless of the temperature required.

However, in recent years, the supply of liquefied carbon dioxide gas, which is the raw material of dry ice, has been in short supply, especially in summer. Demand for liquefied carbon dioxide is diverse, and it is socially natural that priority should be given to supply to life-threatening medical sites. Therefore, in the field of distribution, the application of latent heat storage materials to replace dry ice is progressing.

The heat storage material for refrigeration disclosed in Patent Document 1 contains water and at least one of ammonium chloride, ammonium bromide, ammonium sulfate, and ammonium nitrate as an ammonium salt. The heat storage material for refrigeration having this configuration has a melting point in the range of -15°C to -22°C, a large heat of fusion, and excellent phase change stability.

JP-A-63-312387

The latent heat storage material must be solidified before use. However, the latent heat storage material composed of inorganic salt and water is prone to a phenomenon called supercooling, in which solidification does not start even below the melting point. For example, a latent heat storage material with a melting point of around -25°C, which has been mainly used as a latent heat storage material to replace dry ice, requires a freezer with a set temperature of -35°C or less in order to freeze. .

In general, the lower the set temperature of the freezer, the more power it consumes. Since a large amount of latent heat storage material is required for physical distribution, the energy consumption required for solidification is enormous. However, as described above, the temperature required for frozen food has a grade, and not all food requires a latent heat storage material having a melting point of around -25°C. That is, if a latent heat storage material with a higher melting point than before is used for frozen food that requires a cold storage temperature higher than around -25°C, the set temperature required for the freezer can be raised. , power consumption can be reduced.

Among them, the latent heat storage material used for transporting frozen foods that need to be kept cold at −18° C. or less must have a melting point of −18° C. or less. For this reason, even if the temperature of the freezer is increased for the purpose of reducing power consumption, the limit is -20°C. is ideal. In addition, frozen foods are often stored in a freezer warehouse controlled to a temperature range of -20°C to -25°C. The latent heat storage material used for cold transportation can coexist in the freezer warehouse and be solidified. That is, it is sufficient that such a latent heat storage material solidifies at -20°C or higher and has a melting point of -18°C or lower.

The present disclosure has been made to solve the above problems. An object of the present disclosure is to provide a latent heat storage material that can be solidified at −20° C. or higher and that can keep an object to be cold-insulated such as frozen food cold at a temperature of −18° C. or lower.

As a result of intensive research by the present inventors to solve the above problems, by blending ammonium chloride, ammonium bromide and water at a specific concentration, it solidifies at -20 ° C. and melts at a temperature of -18 ° C. or less. It was clarified that a latent heat storage material that absorbs heat by

The latent heat storage material of the first form of the present disclosure contains 3.5 to 22.5 parts by weight of ammonium chloride, 6.5 to 25.5 parts by weight of ammonium bromide, and water, and ammonium chloride , ammonium bromide and water in a total amount of 100 parts by weight, and has a melting onset temperature in the range of -18°C to -20°C.

A human body cooling apparatus of a second aspect of the present disclosure includes the latent heat storage material of the first aspect of the present disclosure, and a body of the cooling apparatus liquid-tightly housing the latent heat storage material.

A physical distribution packaging container and a food cooling device according to the third aspect of the present disclosure include the cooling device according to the second aspect of the present disclosure.

A human body cooling apparatus according to a fourth aspect of the present disclosure includes the latent heat storage material according to the first aspect of the present disclosure, and a human body cooling apparatus main body having a plurality of accommodating portions and a plurality of joint portions.

A physical distribution packaging container and a food cold insulator according to the fifth aspect of the present disclosure include the cold insulator according to the fourth aspect of the present disclosure.

A human body cooling apparatus according to a sixth aspect of the present disclosure includes the latent heat storage material according to the first aspect of the present disclosure, and a human body cooling apparatus main body including a plurality of accommodating portions and a plurality of joint portions.

A physical distribution packaging container and a food cold insulator according to the seventh aspect of the present disclosure include the cold insulator according to the sixth aspect of the present disclosure.

According to the present disclosure, a latent heat storage material that can keep cold objects such as frozen foods cold for a long time at a temperature of −18° C. or less and can be solidified at a melting point of −18° C. or less and −20° C. or more. can provide

4 is a table showing compositions and the like of latent heat storage materials according to examples and comparative examples. FIG. 3 is a diagram illustrating a method of measuring a melting start temperature and latent heat amount of a latent heat storage material according to an example; FIG. 3 is a diagram showing solidification characteristics of latent heat storage materials of Examples 1, 2, and 3; 3 is a diagram showing melting characteristics of the latent heat storage material of Example 1. FIG. Fig. 10 is a vertical cross-sectional view schematically illustrating a human body cooling apparatus of a second embodiment; FIG. 10 is a cross-sectional view schematically illustrating a human body cooling apparatus of a second embodiment; FIG. 10 is a diagram schematically illustrating a manufacturing apparatus used for manufacturing the human body cooling apparatus of the second embodiment; FIG. 10 is a diagram schematically illustrating a manufacturing apparatus used for manufacturing the human body cooling apparatus of the second embodiment; FIG. 10 is a diagram schematically illustrating a manufacturing apparatus used for manufacturing the human body cooling apparatus of the second embodiment; FIG. 11 is a cross-sectional view schematically illustrating a physical distribution packaging container of a third embodiment; FIG. 11 is a perspective view schematically illustrating a human body cooling apparatus of a fourth embodiment; FIG. 11 is a cross-sectional view schematically illustrating a human body cooling apparatus of a fourth embodiment; FIG. 11 is a diagram schematically illustrating a manufacturing apparatus used for manufacturing the human body cooling apparatus of the fourth embodiment; FIG. 11 is a cross-sectional view schematically illustrating a physical distribution packaging container of a fifth embodiment; FIG. 11 is a cross-sectional view schematically illustrating a physical distribution packaging container of a modified example of the fifth embodiment; FIG. 11 is a plan view schematically illustrating a human body cooling apparatus of a sixth embodiment; FIG. 11 is a cross-sectional view schematically illustrating a human body cooling apparatus of a sixth embodiment; FIG. 11 is a perspective view schematically illustrating a human body cooling apparatus of a modified example of the sixth embodiment. FIG. 11 is a cross-sectional view schematically illustrating a human body cooling apparatus of a modified example of the sixth embodiment. FIG. 12 is a cross-sectional view schematically illustrating an intermediate product obtained when the human body cooling apparatus of the sixth embodiment is manufactured. FIG. 12 is a cross-sectional view schematically illustrating an intermediate product obtained when the human body cooling apparatus of the sixth embodiment is manufactured. FIG. 12 is a cross-sectional view schematically illustrating an intermediate product obtained when the human body cooling apparatus of the sixth embodiment is manufactured. FIG. 12 is a cross-sectional view schematically illustrating an intermediate product obtained when the human body cooling apparatus of the sixth embodiment is manufactured. FIG. 11 is a cross-sectional view schematically illustrating a physical distribution packaging container of a seventh embodiment;

Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. In the drawings, the same or equivalent elements are denoted by the same reference numerals, and overlapping descriptions are omitted.

1. First Embodiment 1.1 Composition of latent heat storage material The latent heat storage material of the first embodiment is brought close to or in contact with an object to be cold-insulated in a solidified state, thereby cooling the object to be cold-insulated at a temperature near the melting point. Keep cold. The latent heat storage material keeps the object to be cold-insulated at a temperature near the melting point of the latent heat storage material until it is completely melted.

The latent heat storage material of the first embodiment contains 3.5 to 22.5 parts by weight of ammonium chloride, 6.5 to 25.5 parts by weight of ammonium bromide, and water. The sum of ammonium chloride, ammonium bromide and water is 100 parts by weight and has an onset melting temperature in the range of -18°C to -20°C.

The latent heat storage material of the first embodiment has a composition close to the eutectic composition by having the composition within the range described above. Therefore, the latent heat storage material consists of a mixed aqueous solution of ammonium chloride and ammonium bromide in the liquid state, but mainly consists of the eutectic of ammonium chloride, ammonium bromide and ice in the solid state. Therefore, when the latent heat storage material is solidified, a eutectic of ammonium chloride, ammonium bromide and ice is mainly formed. When the latent heat storage material has a composition within the desirable range described above, almost no solidified components other than the eutectic are formed.

The eutectic of ammonium chloride and ice has a eutectic point at about -15°C. Also, the eutectic of ammonium bromide and ice has a eutectic point at about -17°C. On the other hand, the eutectic of ammonium chloride, ammonium bromide and ice was found to have a eutectic point at about −19° C., which is lower than any of the above eutectics. In addition, ammonium chloride and ammonium bromide, which are ionic substances, have the property of dissociating into cations and anions when dissolved in water. When multiple types of ionic substances with different cations and anions are contained, recombination of ionic species occurs, and ionic substances different from the contained ionic substances are generated, resulting in the formation of eutectic. Although there is a phenomenon of inhibition, since the cations of both ammonium chloride and ammonium bromide are ammonium ions, recombination of ionic species and production of different ionic substances as described above do not occur. From these, it has a single eutectic point at about -19°C, with only eutectics of ammonium chloride, ammonium bromide and ice being formed. Therefore, the latent heat storage material of the first embodiment has a melting start temperature at about -19°C by having a composition close to the eutectic composition. More specifically, it has a melting initiation temperature in the range of -18°C to -20°C. Therefore, the latent heat storage material starts melting and absorbs heat at a temperature of −18° C. or less, so that the object to be cold-insulated can be kept cold at a temperature of −18° C. or less.

The latent heat storage material of the first embodiment preferably contains a water-insoluble supercooling inhibitor such as calcium carbonate, aluminum oxide, or activated carbon. A water-insoluble supercooling inhibitor is dispersed in water. By including the water-insoluble supercooling inhibitor, when the latent heat storage material is solidified at −20° C., it is possible to suppress the phenomenon that the latent heat storage material is supercooled and the start of solidification is delayed. Furthermore, the cooling time required to start cooling the latent heat cold storage material and bring the object to be cold-insulated at a temperature of −18° C. or lower as described above can be shortened. Furthermore, since it can be solidified at -20°C, which is close to -18°C, it is not necessary to lower the set temperature of equipment such as a freezer that freezes the latent heat storage material, and power consumption can be reduced. can. On the other hand, water-soluble supercooling inhibitors such as sodium sulfate and disodium hydrogen phosphate exhibit a freezing point depression for the latent heat storage material and may inhibit solidification at -20 ° C. Therefore, the water-insoluble It is considered that the effect is lower than that of the supercooling inhibitor.

The water-insoluble supercooling inhibitor more preferably contains calcium carbonate. By containing calcium carbonate, it is possible to effectively suppress the delay in the start of solidification due to overcooling.

The concentration of the water-insoluble supercooling inhibitor is desirably 0.1 to 10 parts by weight per 100 parts by weight of ammonium chloride, ammonium bromide and water combined. If the concentration is less than 0.1 part by weight, the effect of suppressing supercooling is not observed. 10 parts by weight is the limit.

The latent heat storage material of the first embodiment may contain components other than the components described above. Components other than those mentioned above include, for example, at least one selected from the group consisting of thickeners, antibacterial agents and pigments.

<Examples and comparative examples of the first embodiment>
The latent heat storage materials of Examples and Comparative Examples were prepared by mixing ammonium chloride, ammonium bromide, water, and a water-insoluble supercooling inhibitor in the weight ratios shown in the table of FIG. The total amount of ammonium chloride, ammonium bromide and water was adjusted to 100 parts by weight.

FIG. 1 also shows the results of latent heat, melting initiation temperature, solidification performance at −20° C. obtained from differential scanning calorimetry and solidification property evaluation, which will be described later.

FIG. 2 is a diagram for explaining a method of measuring the melting start temperature and the amount of latent heat of the latent heat storage material of the first embodiment.

When the melting start temperature and latent heat amount of the latent heat storage material of the first embodiment are measured, as shown in FIG. 10 is obtained. The horizontal axis is temperature (T), and the vertical axis is melting enthalpy per unit temperature (dH/dT). Further, the temperature at the intersection 16 of a straight line 13 obtained by linear extrapolation of the low temperature side 12 of the melting peak 11 included in the DSC curve 10 and a straight line 15 obtained by linear extrapolation of the low temperature side baseline 14 included in the DSC curve 10 is the melting point. is taken as the starting temperature. The latent heat amount is obtained by dividing the area of the latent heat region 17 surrounded by the melting peak 11 and the straight line 15 by the weight of the latent heat storage material.

From FIG. 1, the melting start temperatures of the latent heat storage materials of Examples 1 to 15 are all in the range of -18°C to -20°C. That is, the latent heat storage material of the first embodiment has a melting start temperature in the range of -18°C to -20°C. On the other hand, the melting start temperatures of the latent heat storage materials of Comparative Examples 1 to 6 all deviate from the range of -18°C to -20°C.

The solidification properties of the latent heat storage materials of Examples and Comparative Examples were evaluated. A thermocouple was placed in 40 g of the latent heat storage material according to the example and the comparative example, and the temperature at the time of solidification of each latent heat storage material was measured. Specifically, the temperature of each latent heat storage material maintained at 25° C. was lowered to −20° C. in a constant temperature bath, and changes over time in the temperature of each latent heat storage material were measured with a thermocouple. The solidification characteristics at -20°C shown in Figure 1 are ◎ when the latent heat storage material starts to solidify before reaching the environmental temperature of -20°C, and ◯ when it starts to solidify after reaching the environmental temperature. , the case where it did not coagulate was evaluated as x.

FIG. 3 shows the results of evaluation of the solidification characteristics of the latent heat storage materials of Examples 1, 2, and 3.

As shown in FIG. 3, the latent heat storage material of Example 1 reached the environmental temperature of the constant temperature bath after 5.5 hours, and after 6.5 hours, a rapid temperature rise originating from the start of solidification occurred and solidification progressed. That is, the latent heat storage material of the first embodiment can be solidified at -20°C.

On the other hand, the latent heat storage material of Example 2 started to solidify before reaching the environmental temperature of the constant temperature bath after 3 hours. That is, by containing calcium carbonate, which is a water-insoluble supercooling inhibitor, at a concentration of 0.1 to 10 parts by weight, supercooling is suppressed, and it is possible to solidify before reaching -20 ° C. be. Therefore, it is possible to solidify the latent heat storage material in a short time.

The latent heat storage material containing aluminum oxide of Example 3 started to solidify before reaching the environmental temperature of the constant temperature bath after 4.5 hours, later than the latent heat storage material containing calcium carbonate of Example 2. bottom. That is, it is possible to solidify before reaching -20°C by containing a water-insoluble supercooling inhibitor, but in terms of shortening the solidification time, it is more preferable to contain calcium carbonate.

As described above, in Examples 1 to 3, the set temperature required for the freezer that freezes the latent heat storage material can be increased compared to the conventional latent heat storage material, so power consumption can be suppressed. can.

The melting characteristics of the latent heat storage material of Example 1 were evaluated. A thermocouple was placed in 100 g of the latent heat storage material of Example 1, and the temperature at the time of melting of each latent heat storage material was measured. Specifically, after the latent heat storage material of Example 1 was solidified at −20° C. in a constant temperature bath, the temperature was raised to −10° C., and the temperature change over time of the latent heat storage material was measured by a thermocouple.

FIG. 4 shows the results of melting property evaluation of the latent heat storage material of Example 1. In FIG.

As can be seen from FIG. 4, the latent heat storage material of Example 1 was kept at −18° C. or lower until it all melted after 4.5 hours and the temperature increased sharply. That is, it is possible to keep the object to be cold-insulated at −18° C. or below by keeping the object to be cold-insulated with the latent heat storage material of the first embodiment.

2. Second Embodiment 2.1 Human body cooling apparatus FIG. 5 is a longitudinal sectional view schematically illustrating a human body cooling apparatus 2 of a second embodiment. FIG. 6 is a cross-sectional view schematically illustrating the human body cooling apparatus 2 of the second embodiment.

The cold insulator 2 insulates an object to be kept cold. The object to be kept cold is, for example, frozen food that is kept cold at a temperature of -18°C or lower. The cold insulator 2 is a so-called blow container type cold insulator.

As illustrated in FIGS. 5 and 6 , the human body cooling apparatus 2 includes a latent heat storage material 201 and a human body cooling apparatus main body 202 .

The latent heat storage material 201 is the latent heat storage material of the first embodiment.

The body cooling device body 202 accommodates the latent heat storage material 201 in a liquid-tight manner. The latent heat storage material 201 is accommodated in an internal space 201c formed in the body 202 of the human body cooling apparatus.

As illustrated in FIGS. 5 and 6 , the human body cooling apparatus body 202 includes a housing member 211 , an injection port 212 and a sealing member 213 .

The housing member 211 has a hollow structure. Thereby, an internal space 201 c in which the latent heat storage material 201 is accommodated is formed in the accommodating member 211 .

The housing member 211 is desirably made of a highly rigid material. As a result, it is possible to prevent the shape of the housing member 211 from changing when the latent heat storage material 201 changes from solid to liquid. As a result, the human body cooling apparatus 2 is characterized by a small change in shape when the latent heat storage material 201 changes from solid to liquid.

The material forming the housing member 211 includes, for example, at least one selected from the group consisting of resin materials, metal materials, and inorganic materials. The resin material contains at least one selected from the group consisting of polyethylene, polypropylene, polyester, polyurethane, polycarbonate, polyvinyl chloride and polyamide. The metal material includes at least one selected from the group consisting of aluminum, stainless steel, copper and silver. The inorganic material includes at least one selected from the group consisting of glass, ceramics and ceramics. The material forming the housing member 211 is desirably a resin material. As a result, the ease of manufacture and durability of the housing member 211 can be improved.

The inlet 212 is coupled to the upper portion of the receiving member 211 .

A sealing member 213 seals the inlet 212 .

The cold insulator 2 is brought close to or in contact with an object to be cold-insulated. As a result, the object to be cooled can be kept cool at a temperature near the melting point of the latent heat storage material 201 .

2.2 Method for Manufacturing Human Body Cooling Equipment FIGS. 7A to 7C are diagrams schematically illustrating a manufacturing apparatus 221 used for manufacturing the human body cooling equipment 2 of the second embodiment.

As illustrated in FIGS. 7A to 7C , when the human body cooling apparatus 2 is manufactured, the liquid latent heat storage material 201 is injected into the housing member 211 through the injection port 212 by the cylinder pump 231 . be. The latent heat storage material 201 may be injected into the containing member 211 by other methods. For example, the latent heat storage material 201 may be injected into the housing member 211 by a monopump.

When the latent heat storage material 201 is injected into the housing member 211, the tip of the filling hose 241 of the cylinder pump 231 is connected to the injection port 212 as shown in FIG. 7A. Also, the tip of the suction hose 242 of the cylinder pump 231 is inserted into the latent heat storage material 201 .

Subsequently, the piston 243 of the cylinder pump 231 is lowered, as illustrated in FIG. 7B. Thereby, the latent heat storage material 201 is sucked up. The sucked latent heat storage material 201 is sucked into the cylinder 244 of the cylinder pump 231 via the suction hose 242 .

Subsequently, the piston 243 of the cylinder pump 231 is raised, as illustrated in FIG. 7C. Thereby, the latent heat storage material 201 is discharged from the inside of the cylinder 244 of the cylinder pump 231 . The discharged latent heat storage material 201 is injected into the housing member 211 via the filling hose 241 . The injection amount of the latent heat storage material 201 is not limited, but is preferably 70% or more and 90% or less of the internal volume of the housing member 211 .

Subsequently, the injection port 212 is sealed with the sealing member 213 . The sealing of the injection port 212 by the sealing member 213 is performed by, for example, welding the sealing member 213 to the injection port 212 . As a result, the injection port 212 is hermetically plugged by the sealing member 213 . This can prevent the latent heat storage material 201 from leaking from the housing member 211 . The sealing member 213 is welded to the inlet 212 by ultrasonic welding, heat welding, or the like.

The filling port 212 may be sealed by the sealing member 213 by screwing the sealing member 213 into the filling port 212 as a screw cap. As a result, the sealing member 213 can be a plug that can be freely opened and closed by hand.

Subsequently, the human body cooling apparatus 2 is left in an environment having a temperature equal to or lower than the solidification temperature of the latent heat storage material 201 . Thereby, the latent heat storage material 201 is solidified.

When the cold insulator 2 is accommodated in the distribution packaging container, the latent heat storage material 201 is solidified before the cold insulator 2 is accommodated in the distribution packaging container. However, if the internal temperature of the physical distribution packaging container can be lowered to the temperature below the solidification start temperature of the latent heat storage material 201 in the initial stage of the physical distribution process, the latent heat storage temperature is reduced after the cold insulator 2 is housed in the physical distribution packaging container. Material 201 may be allowed to solidify. As a result, use of the human body cooling apparatus 2 can be started while the latent heat storage material 201 is liquid.

3 Third embodiment 3.1 Logistics packaging container (food cooling device)
FIG. 8 is a cross-sectional view schematically illustrating the physical distribution packaging container 3 of the third embodiment.

The physical distribution packaging container 3 keeps the object X to be kept cool. The physical distribution packaging container 3 is used for transporting the object X to be insulated while keeping it cool. The object X to be kept cold is, for example, frozen food that is kept cold at a temperature of -18°C or lower. When the object X to be cold-insulated is frozen food, the distribution packing container 3 is also a food cooling tool for keeping the frozen food cold.

As illustrated in FIG. 8 , the physical distribution packaging container 3 includes the cooling device 2 of the second embodiment and a physical distribution packaging container main body 301 .

The physical distribution packaging container main body 301 accommodates the cold insulator 2 and the object X to be cold-insulated.

The cold insulator 2 sandwiches the object X to be cold-insulated from above and below. As a result, at least part of the cold insulator 2 comes into contact with the object X to be cold-insulated. As a result, heat is conducted from the object X to be cold-insulated to the cold insulator 2 via the contact surface 2 a between the object X to be cold-insulated and the cold insulator 2 . Thereby, the object X to be kept cold can be effectively kept cold. In addition, it is possible to suppress the heat flowing from the outside of the physical distribution packaging container 3 into the physical distribution packaging container 3 from affecting the object X to be insulated. Therefore, the cold insulator 2 can keep the cold-insulated object X at a temperature near the melting point of the latent heat storage material 201 . The physical distribution packaging container 3 is suitably used for cold storage and transportation of frozen food that is kept cold at a temperature of -18°C or lower.

The physical distribution packaging container 3 may include a heat insulating member arranged above the cooling device 2 . Thereby, the cold insulation performance of the physical distribution packaging container 3 can be improved.

The shape, number, and attitude of the cold insulator 2 are changed according to the shape, properties, and the like of the object X to be cold-insulated.

4. Fourth Embodiment 4.1 Human Body Cooling Device FIG. 9 is a perspective view schematically illustrating a human body cooling device 4 of a fourth embodiment. FIG. 10 is a cross-sectional view schematically illustrating the human body cooling apparatus 4 of the fourth embodiment. FIG. 10 illustrates a cross-section at section line XI-XI drawn in FIG.

The cold insulator 4 is a so-called film pack type cold insulator.

As illustrated in FIGS. 9 and 10 , the human body cooling apparatus 4 includes a latent heat storage material 401 and a human body cooling apparatus main body 402 .

The latent heat storage material 401 is the latent heat storage material of the first embodiment.

As illustrated in FIGS. 9 and 10 , the human body cooling apparatus body 402 includes a plurality of housing portions 411 and a plurality of joint portions 412 .

Each of the plurality of accommodating portions 411 accommodates the latent heat storage material 401 in a liquid-tight manner. The latent heat storage material 401 is housed in an internal space 411 c formed in each of the plurality of housing portions 411 .

Each of the plurality of housing portions 411 has a strip-like planar shape and an elliptical cross-sectional shape. Each of the plurality of housing portions 411 may have a planar shape other than a rectangular planar shape, or may have a cross-sectional shape other than an elliptical cross-sectional shape.

The human body cooling apparatus main body 402 includes three accommodating portions 411 . The number of accommodating portions 411 provided in the human body cooling apparatus main body 402 may be increased or decreased. The number of accommodating portions 411 provided in the body 402 of the cold insulator body 402 is increased or decreased according to the size of the object to be cold-insulated. Thereby, the size of the cold insulator 4 can be changed according to the size of the object to be kept cold.

The latent heat storage material 401 may be one type of latent heat storage material, or may be two or more types of latent heat storage materials having mutually different melting points. When two or more types of latent heat storage materials having mutually different melting points are accommodated in a plurality of accommodating portions 411, it is possible to simultaneously insulate a plurality of objects to be insulated at different insulated temperatures.

Each of the plurality of joints 412 couples two adjacent housing portions 411 included in the plurality of housing portions 411 . Each of the multiple joints 412 has a joint function that allows the two housings 411 to move. Since the cold insulator 4 has a plurality of joints 412 , the shape of the cold insulator 4 along the object to be cold-insulated can be given even when the latent heat storage material 401 is solid. Thereby, even when the object to be cold-insulated has a complicated shape, the cold insulator 4 can be brought into contact with the object to be cold-insulated over a wide range. Thereby, even if the object to be cold-insulated has a complicated shape, the object to be cold-insulated can be effectively kept cold.

As illustrated in FIG. 10 , the human body cooling apparatus body 402 includes two film members 421 . The two film members 421 are joined to each other at a plurality of joint portions 431 to form a plurality of joint portions 412 , and the remaining portions are not joined to form a plurality of housing portions 411 .

The film member 421 is made of a material capable of suppressing leakage and volatilization of the latent heat storage material 401 . Also, the film member 421 is made of a material that can be bonded to each other. In addition, the film member 421 is made of a flexible material that can impart joint functions to the plurality of joint portions 412 .

The material forming the film member 421 includes, for example, at least one selected from the group consisting of polyethylene, polypropylene, polyamide and polyester. The material forming the film member 421 may be one type of material, or may be a combination of two or more types of materials.

The film member 421 may be a single layer film or a multilayer film. Film member 421 is desirably a multilayer film comprising a low density polyethylene resin layer and a polyamide resin layer. When the film member 421 is the multilayer film, the two film members 421 are stacked such that the two low-density polyethylene resin layers provided on the two film members 421 are in contact with each other. Further, the contact surfaces of the two low-density polyethylene resin layers are thermocompression bonded to each other. Thereby, a plurality of joints 412 can be formed.

Film member 421 may comprise a substrate and a thin film disposed over the substrate. The material forming the thin film includes, for example, at least one selected from the group consisting of aluminum and silicon dioxide. Thereby, the durability and barrier properties of the film member 421 can be improved.

The human body cooling apparatus 4 may be provided with a temperature indicating material sticker attached to the film member 421 to indicate the temperature. This makes it possible to recognize the temperature of the human body cooling apparatus 4 .

The human body cooling apparatus 4 may have a so-called pack-in-pack structure. When the human body cooling apparatus 4 has a pack-in-pack structure, the human body cooling apparatus 4 includes a film that wraps the film member 421 . As a result, the physical strength, texture, and heat insulating properties of the human body cooling apparatus 4 can be improved.

The cold insulator 4 may be attached to a fixing jig for fixing the cold insulator 4 to the cold-insulated object and fixed to the cold-insulated object. Fixing jigs are, for example, supporters, towels, bandages, and the like.

4.2 Method for Manufacturing Human Body Cooling Equipment FIG. 11 is a diagram schematically illustrating a manufacturing apparatus 441 used for manufacturing the human body cooling equipment 4 of the fourth embodiment.

The manufacturing device 441 is a so-called vertical pillow packaging machine that is also used for packaging food.

As illustrated in FIG. 11 , when the human body cooling apparatus 4 is manufactured, the latent heat storage material 401 stored in the constant temperature bath 451 is transported to the stirring bath 452 .

Subsequently, the latent heat storage material 401 transported to the stirring tank 452 is stirred by the stirrer 453 .

Subsequently, two sheets of film 454 are unwound from a film roll (not shown).

Subsequently, the two sheets of film 454 that have been let out are joined together by the former section 455 at both ends extending in the longitudinal direction.

Subsequently, both ends of the combined two films 454 are thermo-compressed by vertical seal portions 456 . As a result, the two films 454 form a cylindrical object.

Subsequently, the two films 454 forming the cylindrical object are thermo-compressed by the horizontal sealing portion 457 along the crimping line extending in the minor axis direction of the two films 454 .

Pump 459 is then activated. As a result, the stirred latent heat storage material 401 is injected into the cylindrical body composed of the two films 454 .

Subsequently, the two films 454 forming the cylindrical object are thermally compressed again along the crimping line extending in the short axis direction of the two films 454 by the horizontal sealing portion 457 . Thereby, a housing portion 411 and a joint portion 412 are formed. The formed accommodating portion 411 accommodates the latent heat storage material 401 .

5 Fifth embodiment 5.1 Logistics packaging container (food cooling device)
FIG. 12 is a cross-sectional view schematically illustrating the physical distribution packaging container 5 of the fifth embodiment.

The physical distribution packaging container 5 keeps the object X to be kept cool. The physical distribution packing container 5 is used for transporting the cold-insulated object X in a cold state. The object X to be kept cold is, for example, frozen food that is kept cold at a temperature of -18°C or lower. When the object X to be kept cold is frozen food, the distribution packing container 5 is also a food cooling tool for keeping the frozen food cold.

As illustrated in FIG. 12 , the physical distribution packaging container 5 includes the cooling device 4 of the fourth embodiment and a physical distribution packaging container main body 501 .

The physical distribution packing container main body 501 accommodates the cold insulator 4 and the object X to be cold-insulated.

The cold insulator 4 covers the object X to be cold-insulated from above. As a result, at least part of the cold insulator 4 comes into contact with the object X to be cold-insulated. As a result, heat is conducted from the object X to be cold-insulated to the cold insulator 4 via the contact surface 4 a between the object X to be cold-insulated and the cold insulator 4 . Thereby, the object X to be kept cold can be effectively kept cold. In addition, it is possible to suppress the influence of heat flowing into the physical distribution packaging container 5 from the outside of the physical distribution packaging container 5 on the object X to be insulated. Therefore, the cold insulator 4 can keep the cold-insulated object X at a temperature near the melting point of the latent heat storage material 401 . Therefore, the cold insulator 4 is suitably used for cold storage and transportation of frozen food that is kept cold at a temperature of -18°C or lower.

The shape, number, and attitude of the cold insulator 4 during use are changed according to the shape, properties, and the like of the object X to be cold-insulated.

5.2 Modification FIG. 13 is a cross-sectional view schematically illustrating a physical distribution packaging container 5A of a modification of the fifth embodiment.

The physical distribution packaging container 5A is different from the physical distribution packaging container 5 in that the physical distribution packaging container 5A is provided with the cooling equipment 2 of the second embodiment in addition to the cooling equipment 4 of the fourth embodiment. The cold insulator 2 is arranged between the object to be cold-insulated X and the bottom surface 510 a of the physical distribution packing container body 501 . As a result, it is possible to suppress heat from flowing into the object to be cold-insulated X via the bottom surface 510a of the physical distribution packing container body 501 .

As described above, the human body cooling apparatus 2 is characterized by a small change in shape when the latent heat storage material 201 changes from solid to liquid. Therefore, in the physical distribution packaging container 5A, the cold-insulated object X can be stably placed on the cold insulator 2 .

6. Sixth Embodiment 6.1 Human Body Cooling Device FIG. 14 is a plan view schematically illustrating a human body cooling device 6 of a sixth embodiment. FIG. 15 is a cross-sectional view schematically illustrating the human body cooling apparatus 6 of the sixth embodiment.

The cold insulator 6 is a so-called blister pack type cold insulator.

As illustrated in FIGS. 14 and 15 , the human body cooling apparatus 6 includes a latent heat storage material 601 and a human body cooling apparatus main body 602 .

The latent heat storage material 601 is the latent heat storage material of the first embodiment.

As illustrated in FIGS. 14 and 15 , the human body cooling apparatus body 602 includes a plurality of housing portions 611 and a plurality of joint portions 612 .

Each of the plurality of accommodating portions 611 accommodates the latent heat storage material 601 in a liquid-tight manner. The latent heat storage material 601 is housed in an internal space 611 c formed in each of the plurality of housing portions 611 .

Each of the plurality of housing portions 611 has a strip-like planar shape and a trapezoidal cross-sectional shape. Each of the plurality of housing portions 611 may have a planar shape other than a rectangular planar shape, or may have a cross-sectional shape other than a trapezoidal cross-sectional shape.

The human body cooling apparatus main body 602 includes six accommodating portions 611 . The number of accommodating portions 611 provided in the human body cooling apparatus main body 602 may be increased or decreased. The number of accommodating parts 611 provided in the body 602 of the cold insulator is changed according to the size of the object to be kept cold. Thereby, the size of the cold insulator 6 can be changed according to the size of the object to be kept cold.

The latent heat storage material 601 may be one type of latent heat storage material, or may be two or more types of latent heat storage materials having mutually different melting points. When two or more types of latent heat storage materials having mutually different melting points are accommodated in a plurality of accommodating portions 611, it is possible to simultaneously insulate a plurality of objects to be insulated at different insulated temperatures.

When the object to be cold-insulated has a can-like shape, the contact surface 611a of the housing portion 611 may be a concave curved surface having a shape conforming to the convex curved surface of the object to be cold-insulated. When the object to be insulated has a tapered shape, the thickness of the accommodating portion 611 may be changed along the longitudinal direction of the accommodating portion 611 .

Each of the plurality of joints 612 couples two adjacent housing portions 611 included in the plurality of housing portions 611 . Each of the multiple joints 612 has a joint function that allows the two housings 611 to move. Since the cold insulator 6 is provided with a plurality of joints 612, the shape of the cold insulator 6 that follows the object to be cold-insulated can be given even when the latent heat storage material 601 is solid. Thereby, even when the object to be cold-insulated has a complicated shape, the cold insulator 6 can be brought into contact with the object to be cold-insulated over a wide range. Thereby, even if the object to be cold-insulated has a complicated shape, the object to be cold-insulated can be effectively kept cold.

As illustrated in FIG. 15 , the human body cooling apparatus body 602 includes a housing member 621 and a sealing member 622 . The housing member 621 and the sealing member 622 are joined to each other at a plurality of joint portions 631 to form a plurality of joint portions 612 , and are not jointed to each other at remaining portions to form a plurality of housing portions 611 .

As illustrated in FIG. 15, the receiving member 621 includes multiple recesses 641 . The sealing member 622 has a flat plate shape. The plurality of recesses 641 constitute the plurality of housing portions 611 together with the sealing member 622 .

The housing member 621 is made of a material having hardness capable of retaining the shape of the recess 641 . The housing member 621 and the sealing member 622 are made of a material capable of suppressing leakage and volatilization of the latent heat storage material 601 . In addition, the housing member 621 and the sealing member 622 are made of materials that can be joined together. Also, the housing member 621 and the sealing member 622 are made of a flexible material that can impart joint functions to the plurality of joint portions 612 .

The material forming the housing member 621 includes, for example, at least one selected from the group consisting of polyethylene, polypropylene, polyamide, polyester, polycarbonate, and polyvinyl chloride. The material constituting the housing member 621 may be one type of material, or may be a combination of two or more types of materials.

The containing member 621 preferably has a thickness of 100 μm to 1000 μm. Thereby, flexibility can be imparted to the housing member 621 . Thereby, joint functions can be imparted to the plurality of joint portions 612 .

A material forming the sealing member 622 includes, for example, at least one selected from the group consisting of polyethylene, polypropylene, polyamide, and polyester. The material forming the sealing member 622 may be one type of material, or may be a combination of two or more types of materials.

The sealing member 622 desirably has a thickness of 50 μm to 100 μm. Thereby, flexibility can be imparted to the sealing member 622 . Thereby, joint functions can be imparted to the plurality of joint portions 612 .

The housing member 621 and the sealing member 622 may be single-layer members or multi-layer members. The containment member 621 and the sealing member 622 are desirably multi-layer members comprising a low density polyethylene resin layer and a polyamide resin layer. When the housing member 621 and the sealing member 622 are multilayer members, the housing member 621 and the sealing member 621 and the sealing member 621 and the sealing member 621 are separated so that the two low-density polyethylene resin layers provided in the housing member 621 and the sealing member 622 are in contact with each other. 622 are superimposed. Further, the contact surfaces of the two low-density polyethylene resin layers are thermocompression bonded to each other. Thereby, a plurality of joints 612 can be formed.

At least one member of the containing member 621 and the sealing member 622 may comprise a substrate and a thin film disposed on the substrate. The material forming the thin film includes, for example, at least one selected from the group consisting of aluminum and silicon dioxide. Thereby, the durability and barrier properties of the member can be improved.

The human body cooling apparatus 6 may include a temperature indicating material seal that is attached to at least one member of the housing member 621 and the sealing member 622 to indicate the temperature. This makes it possible to recognize the temperature of the human body cooling device 6 .

The housing member 621 and the sealing member 622 may have fixing portions for maintaining the shape of the human body cooling apparatus 6 in a cylindrical shape. As a result, when the cold insulator 6 is brought close to or in contact with the cold-insulated item, the cold-insulated item 6 can surround the cold-insulated item. The fixing portion includes, for example, hook-and-loop fasteners provided on the surface 621 a of the housing member 621 and the surface 622 a of the sealing member 622 .

6.2 Modification FIG. 16 is a perspective view schematically illustrating a human body cooling apparatus 6A of a modification of the sixth embodiment. FIG. 17 is a cross-sectional view schematically illustrating a human body cooling apparatus 6A of a modified example of the sixth embodiment.

The human body cooling apparatus 6A differs from the human body cooling apparatus 6 in that a human body cooling apparatus support 651 is provided.

The human body cooling apparatus support 651 has a cylindrical shape with a bottom. One end of the human body cooling apparatus support 651 is open. An internal space 651 c for accommodating the human body cooling device 6 is formed in the human body cooling device support 651 . The human body cooling apparatus 6 is deformed so that the accommodating member 621 is arranged radially inward and the sealing member 622 is arranged radially outward. The human body cooling apparatus 6A has a cylindrical shape by including the human body cooling apparatus support 651 and can stand on its own.

The human body warmer support 651 is desirably made of a material that has heat insulating properties and can prevent heat exchange between the outside of the human body warmer support 651 and the inside of the human body warmer support 651 .

The material constituting the human body cooling apparatus support 651 includes, for example, at least one selected from the group consisting of polyethylene foam, urethane foam, and chloroprene rubber (foam rubber).

As shown in FIG. 17, when the cold insulator 6A is in use, a can-shaped or bottle-shaped object to be cold-insulated X is inserted into a cylindrical space 600c surrounded by the cold insulator support 651. be done. Thereby, the cold insulator 6 can be brought close to or in contact with the object X to be cold-insulated. As a result, the cold-insulated object X can be kept cold at a temperature near the melting point of the latent heat storage material 601 .

The human body cooling apparatus support 651 is desirably made of an elastic material. As a result, the cold insulator support 651 can be elastically deformed according to the diameter of the object X to be cold-insulated. As a result, the cold insulator support 651 can be pressed against the object X to be cold-insulated.

6.3 Method for Manufacturing Human Body Cooling Equipment FIGS. 18A to 18D are cross-sectional views schematically illustrating intermediate products obtained when the human body cooling equipment 6 of the sixth embodiment is manufactured.

When manufacturing the human body cooling apparatus 6, as shown in FIG. 18A, a hard film, which is a precursor of the housing member 621, is placed on a mold 661 having grooves 661g having a trapezoidal cross-sectional shape. 671 is loaded.

Subsequently, as shown in FIG. 18B, the shape of the groove 661g formed in the mold 661 is transferred to the hard film 671 by vacuum molding, press working, or the like. Thereby, the housing member 621 is formed.

Subsequently, as illustrated in FIG. 18C, the liquid latent heat storage material 601 is injected into the concave portion 641 of the housing member 621 by a pump or the like.

A sealing member 622 is then placed over the receiving member 621, as illustrated in FIG. 18D. Further, the contact surfaces of the housing member 621 and the sealing member 622 are thermocompressed to form the housing portion 611 and the joint portion 612 .

7 Seventh Embodiment 7.1 Logistics packaging container (food cooling device)
FIG. 19 is a cross-sectional view schematically illustrating the physical distribution packaging container 7 of the seventh embodiment.

The physical distribution packaging container 7 keeps the object X to be kept cool. The physical distribution packaging container 7 is used to transport the object X to be insulated while keeping it cool. The object X to be kept cold is, for example, frozen food that is kept cold at a temperature of -18°C or lower. When the object X to be kept cold is frozen food, the distribution packing container 7 is also a food cooling tool for keeping the frozen food cold.

As illustrated in FIG. 19 , the physical distribution packaging container 7 includes the cold insulator 6 of the sixth embodiment and a physical distribution packaging container main body 701 .

The physical distribution packaging container main body 701 accommodates the cold insulator 6 and the object X to be cold-insulated.

The cold insulator 6 covers the object to be cold-insulated X from above. As a result, at least part of the cold insulator 6 comes into contact with the object X to be cold-insulated. As a result, heat is conducted from the object X to be cold-insulated to the cold insulator 6 via the contact surface 6 a between the object X to be cold-insulated and the cold insulator 6 . Thereby, the object X to be kept cold can be effectively kept cold. In addition, it is possible to suppress the heat flowing from the outside of the physical distribution packaging container 7 into the physical distribution packaging container 7 from affecting the object X to be insulated. Therefore, the cold insulator 6 can keep the cold-insulated object X at a temperature near the melting point of the latent heat storage material 601 . Therefore, the cold insulator 6 is suitably used for cold storage and transportation of frozen food that must be maintained at a temperature of -18°C or lower.

The physical distribution packaging container 7 may include a heat insulating member arranged above the cooling device 6 . Thereby, the cold insulation performance of the physical distribution packaging container 7 can be improved.

In the physical distribution packaging container 7, the surface 621a of the housing member 621 and the bottom surface 701a of the physical distribution packaging container main body 701 may be fixed to each other with a hook-and-loop fastener or the like.

The present disclosure is not limited to the above embodiments, but has substantially the same configuration, the same effect, or the same purpose as the configuration shown in the above embodiment. can be replaced with

2 cold insulator, 3 physical distribution packaging container, 4 cold insulator, 5 physical distribution packaging container, 5A physical distribution packaging container, 6 cold insulator, 6A physical cold insulator, 7 physical distribution packaging container, 201 latent heat storage material, 202 cold insulator main body, 301 physical distribution packaging container Main body, 401 latent heat storage material, 402 cold insulator body, 411 accommodating part, 412 joint part, 501 physical distribution packaging container body, 601 latent heat storage material, 602 cold insulator body, 611 accommodating part, 612 joint part, 621 accommodating member, 622 seal Stopping member 701 Logistics packaging container body

Claims (7)

3.5 to 22.5 parts by weight of ammonium chloride, 6.5 to 25.5 parts by weight of ammonium bromide, and water, wherein the total of ammonium chloride, ammonium bromide and water is A latent heat storage material which is 100 parts by weight and has a melting start temperature in the range of -18°C to -20°C. Containing 0.1 to 10 parts by weight of a water-insoluble supercooling inhibitor per 100 parts by weight of ammonium chloride, ammonium bromide and water,
The latent heat storage material according to claim 1. wherein the water-insoluble supercooling inhibitor is calcium carbonate;
The latent heat storage material according to claim 2. a latent heat storage material according to any one of claims 1 to 3;
a body cooling device that liquid-tightly accommodates the latent heat storage material;
Cooling equipment with The human body cooling apparatus body includes a plurality of storage portions and a joint portion that couples two adjacent storage portions included in the plurality of storage portions to each other,
5. The human body cooling apparatus according to claim 4, wherein each of the plurality of accommodating portions accommodates the latent heat storage material in a liquid-tight manner. A physical distribution packaging container comprising the cooling device according to claim 4 or 5. A food cooling device comprising the cooling device according to claim 4 or 5.

Images