Latent heat storage materials, cooling devices, logistics packaging containers, and food cooling devices

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]

[0001] The present disclosure relates to a latent heat storage material, a cooling device, a logistics packaging container, and a food cooling device. [Background technology]

[0002] When frozen foods are transported, in many cases, the frozen foods are packed in a distribution container, and the distribution container containing the frozen foods is transported.

[0003] To maintain the quality of frozen foods during transportation, they must be kept at least below freezing, and depending on the type of frozen food, it is desirable to maintain temperatures below -10°C, -15°C, or -18°C. However, until now, dry ice has been used to transport frozen foods regardless of the required temperature.

[0004] However, in recent years, there has been a shortage of liquefied carbon dioxide, the raw material for dry ice, with the shortage particularly severe in the summer. Demand for liquefied carbon dioxide is diverse, and it is natural that priority should be given to supplying it to medical facilities where life is at stake. For this reason, the use of latent heat storage materials as an alternative to dry ice is becoming more common in the logistics sector.

[0005] The heat storage material for freezing described in Patent Document 1 contains water and at least one ammonium salt selected from ammonium chloride, ammonium bromide, ammonium sulfate, and ammonium nitrate. The heat storage material for freezing having this composition has a melting point in the range of -15°C to -22°C, a large heat of fusion, and excellent phase change stability. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 63-312387 Summary of the Invention [Problem to be solved by the invention]

[0007] Phase change materials must be solidified before use. However, phase change materials made of inorganic salts and water are prone to a phenomenon known as supercooling, where they do not begin to solidify even below their melting point. For example, phase change materials with a melting point of around -25°C, which have been primarily used as alternatives to dry ice, require a freezer set to a temperature of -35°C or below to solidify.

[0008] Generally, the lower the set temperature of a freezer, the greater the amount of electricity consumed. In logistics, a large amount of latent heat storage material is required, so the energy consumption required for freezing is enormous. However, as mentioned above, there are different temperatures required for frozen foods, and not all foods require latent heat storage material with a melting point around -25°C. In other words, if a latent heat storage material with a higher melting point is used for frozen foods that require a higher cooling temperature than around -25°C, the required set temperature for the freezer can be raised, thereby reducing power consumption.

[0009] Among these, latent heat storage materials used for transporting frozen foods that require refrigeration at -18°C or below must have a melting point of -18°C or below. Therefore, even if the temperature of a freezer is raised to reduce power consumption, the limit is -20°C. Ideally, a latent heat storage material that solidifies in a -20°C freezer would be able to maintain refrigeration at -18°C or below. Furthermore, frozen foods are often stored in refrigerated warehouses controlled to a temperature range of -20°C to -25°C. If a latent heat storage material that solidifies at -20°C or above were available, it would be possible to coexist with the latent heat storage material used for refrigerated transport at -18°C or below and solidify it in the refrigerated warehouse. In other words, such latent heat storage materials are sufficient as long as they solidify at -20°C or above and have a melting point of -18°C or below.

[0010] The present disclosure has been made to solve the above-mentioned problems, and aims to provide a latent heat storage material that can be solidified at temperatures of −20°C or higher and can keep objects to be refrigerated, such as frozen foods, at temperatures of −18°C or lower. [Means for solving the problem]

[0011] As a result of intensive research to solve the above problems, the inventors discovered that by blending ammonium chloride, ammonium bromide, and water at specific concentrations, a latent heat storage material can be obtained that solidifies at -20°C and melts and absorbs heat at temperatures below -18°C, and they applied this.

[0012] The latent heat storage material of the first embodiment 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, the total amount of the ammonium chloride, ammonium bromide, and water being 100 parts by weight, and has a melting initiation temperature in the range of -18°C to -20°C.

[0013] A human cooling device according to a second embodiment of the present disclosure includes the latent heat storage material according to the first embodiment of the present disclosure, and a human cooling device main body that accommodates the latent heat storage material in a liquid-tight manner.

[0014] A logistics packaging container and a food cooling device according to a third embodiment of the present disclosure include the cooling device according to the second embodiment of the present disclosure.

[0015] A human cooling device according to a fourth embodiment of the present disclosure includes the latent heat storage material according to the first embodiment of the present disclosure, and a human cooling device main body including a plurality of storage sections and a plurality of joint sections.

[0016] A logistics packaging container and a food cooling device according to a fifth embodiment of the present disclosure include the cooling device according to the fourth embodiment of the present disclosure.

[0017] A human cooling device according to a sixth embodiment of the present disclosure includes the latent heat storage material according to the first embodiment of the present disclosure, and a human cooling device main body including a plurality of storage sections and a plurality of joint sections.

[0018] A logistics packaging container and a food cooling device according to a seventh embodiment of the present disclosure include the cooling device according to the sixth embodiment of the present disclosure. [Effects of the Invention]

[0019] According to the present disclosure, a latent heat storage material can be provided that can keep items to be refrigerated, such as frozen foods, at temperatures below -18°C for long periods of time and has a melting point below -18°C and can solidify at temperatures above -20°C. [Brief explanation of the drawings]

[0020] [Figure 1] 1 is a table showing the composition of latent heat storage materials according to examples and comparative examples. [Figure 2] FIG. 2 is a diagram illustrating a method for measuring the melting start temperature and latent heat quantity of a latent heat storage material according to an example. [Figure 3] FIG. 2 is a diagram showing the solidification characteristics of the latent heat storage materials of Examples 1, 2, and 3. [Figure 4] FIG. 2 is a diagram showing the melting characteristics of the latent heat storage material of Example 1. [Figure 5] FIG. 10 is a longitudinal cross-sectional view schematically illustrating a human body cooling device according to a second embodiment. [Figure 6] FIG. 10 is a cross-sectional view schematically illustrating a human body cooling device according to a second embodiment. [Figure 7A] FIG. 10 is a diagram schematically illustrating a manufacturing device used to manufacture the cooling device of the second embodiment. [Figure 7B] FIG. 10 is a diagram schematically illustrating a manufacturing device used to manufacture the cooling device of the second embodiment. [Figure 7C] FIG. 10 is a diagram schematically illustrating a manufacturing device used to manufacture the cooling device of the second embodiment. [Figure 8] FIG. 10 is a cross-sectional view schematically illustrating a logistics packaging container according to a third embodiment. [Figure 9] FIG. 10 is a perspective view schematically illustrating a human body cooling device according to a fourth embodiment. [Figure 10] FIG. 10 is a cross-sectional view schematically illustrating a human body cooling device according to a fourth embodiment. [Figure 11] FIG. 10 is a diagram schematically illustrating a manufacturing device used to manufacture the cooling device of the fourth embodiment. [Figure 12] FIG. 10 is a cross-sectional view schematically illustrating a logistics packaging container according to a fifth embodiment. [Figure 13] FIG. 13 is a cross-sectional view schematically illustrating a logistics packaging container according to a modified example of the fifth embodiment. [Figure 14] FIG. 13 is a plan view schematically illustrating a human body cooling device according to a sixth embodiment. [Figure 15] FIG. 10 is a cross-sectional view schematically illustrating a human body cooling device according to a sixth embodiment. [Figure 16] FIG. 13 is a perspective view schematically illustrating a human body cooling device according to a modified example of the sixth embodiment. [Figure 17] FIG. 13 is a cross-sectional view schematically illustrating a human body cooling device according to a modified example of the sixth embodiment. [Figure 18A] FIG. 13 is a cross-sectional view schematically illustrating an intermediate product obtained when the human body cooling apparatus of the sixth embodiment is manufactured. [Figure 18B] FIG. 13 is a cross-sectional view schematically illustrating an intermediate product obtained when the human body cooling apparatus of the sixth embodiment is manufactured. [Figure 18C] FIG. 13 is a cross-sectional view schematically illustrating an intermediate product obtained when the human body cooling apparatus of the sixth embodiment is manufactured. [Figure 18D] FIG. 13 is a cross-sectional view schematically illustrating an intermediate product obtained when the human body cooling apparatus of the sixth embodiment is manufactured. [Figure 19] FIG. 13 is a cross-sectional view schematically illustrating a logistics packaging container according to a seventh embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0021] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. In the drawings, the same or equivalent elements are designated by the same reference numerals, and redundant description will be omitted.

[0022] 1. First embodiment 1.1 Composition of latent heat storage material The latent heat storage material of the first embodiment, when brought into close proximity to or contact with an object in a solidified state, keeps the object cool at a temperature near its melting point. The latent heat storage material continues to keep the object cool at a temperature near its melting point until it completely melts.

[0023] 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 total amount of ammonium chloride, ammonium bromide, and water being 100 parts by weight, and has a melting start temperature in the range of -18°C to -20°C.

[0024] The latent heat storage material of the first embodiment has a composition within the above-mentioned range, and therefore has a composition close to a eutectic composition. Therefore, in a liquid state, the latent heat storage material is composed of a mixed aqueous solution of ammonium chloride and ammonium bromide, but in a solid state, it is composed mainly of a eutectic of ammonium chloride, ammonium bromide, and ice. Therefore, when the latent heat storage material is solidified, a eutectic of mainly ammonium chloride, ammonium bromide, and ice is formed. When the latent heat storage material has a composition within the above-mentioned desirable range, almost no solidification components other than the eutectic are formed.

[0025] The eutectic of ammonium chloride and ice has a eutectic point at approximately -15°C. The eutectic of ammonium bromide and ice has a eutectic point at approximately -17°C. On the other hand, the eutectic of ammonium chloride, ammonium bromide, and ice has a eutectic point at approximately -19°C, lower than either of the eutectics. Furthermore, ammonium chloride and ammonium bromide, which are ionic substances, dissociate into cations and anions when dissolved in water. When multiple ionic substances with different cations and anions are contained, ionic species rearrangement can occur, resulting in the formation of ionic substances different from the contained ionic substances, inhibiting the formation of the eutectic. However, because ammonium chloride and ammonium bromide both have ammonium ions as cations, such ionic species rearrangement and the formation of different ionic substances do not occur. Therefore, the formation of only a eutectic of ammonium chloride, ammonium bromide, and ice results in a single eutectic point at approximately -19°C. Therefore, the latent heat storage material of the first embodiment has a composition close to a eutectic composition, and therefore has a melting start temperature of approximately −19° C. More specifically, it has a melting start temperature in the range of −18° C. to −20° C. Therefore, the latent heat storage material starts to melt and absorb heat at a temperature of −18° C. or lower, and can therefore keep the object to be kept refrigerated at a temperature of −18° C. or lower.

[0026] 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. The water-insoluble supercooling inhibitor is dispersed in water. By including a water-insoluble supercooling inhibitor, the phenomenon of supercooling of the latent heat storage material and delaying the start of solidification can be suppressed when the latent heat storage material is solidified at -20°C. Furthermore, the cooling time required to start cooling the latent heat storage material and achieve a state where the object to be cooled can be kept at a temperature of -18°C or below can be shortened, as described above. Furthermore, since solidification can be achieved 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 solidifies the latent heat storage material more than necessary, thereby reducing power consumption. On the other hand, water-soluble supercooling inhibitors such as sodium sulfate and disodium hydrogen phosphate may cause a freezing point depression of the latent heat storage material and inhibit solidification at -20°C, and are therefore considered to be less effective than the water-insoluble supercooling inhibitors.

[0027] The water-insoluble supercooling inhibitor more preferably contains calcium carbonate, which can effectively suppress delay in the start of solidification due to supercooling.

[0028] The concentration of the water-insoluble supercooling inhibitor is preferably 0.1 to 10 parts by weight relative to 100 parts by weight of the total of ammonium chloride, ammonium bromide, and water. If the concentration is less than 0.1 part by weight, the effect of inhibiting supercooling is not observed, while if the concentration of the water-insoluble supercooling inhibitor becomes high, the amount of latent heat per weight of the latent heat storage material becomes relatively small, so 10 parts by weight is the limit.

[0029] The latent heat storage material of the first embodiment may contain components other than those described above. The components other than those described above include, for example, at least one selected from the group consisting of a thickener, an antibacterial agent, and a pigment.

[0030] <Examples and Comparative Examples of the First Embodiment> The latent heat storage materials according to the 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. 1. The total amount of ammonium chloride, ammonium bromide, and water was adjusted to 100 parts by weight.

[0031] FIG. 1 also shows the results of the properties such as latent heat, melting initiation temperature, and solidification performance at −20° C. obtained from differential scanning calorimetry and solidification property evaluation described below.

[0032] FIG. 2 is a diagram illustrating a method for measuring the melting start temperature and the amount of latent heat of the latent heat storage material of the first embodiment.

[0033] When the melting initiation temperature and latent heat quantity of the latent heat storage material of the first embodiment are measured, a DSC curve 10 is obtained by differential scanning calorimetry (DSC) for the latent heat storage material, as shown in Fig. 2. The horizontal axis is temperature (T), and the vertical axis is melting enthalpy per unit temperature (dH / dT). The melting initiation temperature is determined as the temperature of intersection 16 between line 13, which is a linear extrapolation of low-temperature side 12 of melting peak 11 included in DSC curve 10, and line 15, which is a linear extrapolation of low-temperature side baseline 14 included in DSC curve 10. The latent heat quantity is determined as the area of ​​latent heat region 17 surrounded by melting peak 11 and line 15, divided by the weight of the latent heat storage material.

[0034] 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 are all outside the range of -18°C to -20°C.

[0035] The solidification characteristics of the latent heat storage materials according to the examples and comparative examples were evaluated. A thermocouple was inserted into 40 g of the latent heat storage materials according to the examples and comparative examples, and the temperature of each latent heat storage material at the time of solidification was measured. Specifically, each latent heat storage material maintained at 25°C was cooled to -20°C in a thermostatic chamber, and the change in temperature of each latent heat storage material over time was measured using the thermocouple. The solidification characteristics at -20°C shown in Figure 1 were indicated by a ◎ when the latent heat storage material started to solidify before reaching the ambient temperature of -20°C, a ○ when it started to solidify after reaching the ambient temperature, and an × when it did not solidify.

[0036] The results of the solidification characteristic evaluation of the latent heat storage materials of Examples 1, 2, and 3 are shown in FIG.

[0037] 3, the latent heat storage material of Example 1 reached the ambient temperature of the thermostatic bath after 5.5 hours, and then after 6.5 hours, a sudden temperature rise occurred due to the start of solidification, and solidification progressed. In other words, the latent heat storage material of the first embodiment can be solidified at -20°C.

[0038] On the other hand, the latent heat storage material of Example 2 started to solidify after 3 hours, before the temperature reached the ambient temperature of the thermostatic bath. That is, by including calcium carbonate, a water-insoluble supercooling inhibitor, at a concentration of 0.1 to 10 parts by weight, supercooling is suppressed, and solidification is possible before the temperature reaches -20°C. Therefore, it is possible to solidify the latent heat storage material in a short time.

[0039] The latent heat storage material containing aluminum oxide of Example 3 began to solidify 4.5 hours later, before the temperature reached the ambient temperature of the thermostatic bath, which was later than the latent heat storage material containing calcium carbonate of Example 2. That is, although it is possible to solidify before the temperature reaches -20°C by adding a water-insoluble supercooling inhibitor, it is more preferable to add calcium carbonate in terms of shortening the solidification time.

[0040] In this way, in Examples 1 to 3, the temperature setting required for the freezer that solidifies the latent heat storage material can be increased compared to conventional latent heat storage materials, and therefore power consumption can be reduced.

[0041] 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 of each latent heat storage material was measured when it melted. Specifically, the latent heat storage material of Example 1 was solidified at -20°C in a thermostatic chamber, and then the temperature was raised to -10°C, and the change in temperature of the latent heat storage material over time was measured using the thermocouple.

[0042] The results of the evaluation of the melting characteristics of the latent heat storage material of Example 1 are shown in FIG.

[0043] 4, the latent heat storage material of Example 1 maintained a temperature of -18°C or below until it completely melted after 4.5 hours and the temperature rose sharply. In other words, by keeping an object cooled with the latent heat storage material of the first embodiment, it is possible to maintain the object at a temperature of -18°C or below.

[0044] 2. Second embodiment 2.1 Cooling devices Fig. 5 is a longitudinal sectional view that schematically illustrates the human body cooling apparatus 2 of the second embodiment. Fig. 6 is a transverse sectional view that schematically illustrates the human body cooling apparatus 2 of the second embodiment.

[0045] The cooling device 2 keeps an object to be cooled. The object to be cooled is, for example, frozen food that is kept at a temperature of −18° C. or lower. The cooling device 2 is a so-called blown container type cooling device.

[0046] As shown in FIGS. 5 and 6, the human body cooling tool 2 includes a latent heat storage material 201 and a human body cooling tool 202.

[0047] The latent heat storage material 201 is the latent heat storage material of the first embodiment.

[0048] The ice pack body 202 liquid-tightly accommodates the latent heat storage material 201. The latent heat storage material 201 is accommodated in an internal space 201c formed in the ice pack body 202.

[0049] As shown in FIGS. 5 and 6, the cooling device main body 202 comprises a storage member 211, an injection port 212, and a sealing member 213.

[0050] The housing member 211 has a hollow structure, whereby an internal space 201c in which the latent heat storage material 201 is housed is formed in the housing member 211.

[0051] The containing member 211 is preferably made of a material having high rigidity. This makes it possible to suppress the change in shape of the containing member 211 when the latent heat storage material 201 changes from a solid to a liquid. This allows the human body cooling device 2 to have a feature in which the change in shape is small when the latent heat storage material 201 changes from a solid to a liquid.

[0052] The material constituting the storage member 211 includes, for example, at least one selected from the group consisting of a resin material, a metal material, and an inorganic material. The resin material includes 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, porcelain, and ceramic. The material constituting the storage member 211 is preferably a resin material. This can improve the ease of manufacturing and durability of the storage member 211.

[0053] The inlet 212 is coupled to the top of the containing member 211 .

[0054] The sealing member 213 seals the injection port 212 .

[0055] The cooling device 2 is placed close to or in contact with the object to be insulated. This allows the object to be kept cold at a temperature close to the melting point of the latent heat storage material 201.

[0056] 2.2 Manufacturing method of cooling devices 7A to 7C are diagrams that schematically illustrate a manufacturing device 221 used to manufacture the human body cooling device 2 of the second embodiment.

[0057] 7A to 7C, when the human body cooling device 2 is manufactured, the latent heat storage material 201, which is a liquid, is injected into the housing member 211 via the injection port 212 by a cylinder pump 231. The latent heat storage material 201 may also be injected into the housing member 211 by other methods. For example, the latent heat storage material 201 may be injected into the housing member 211 by a mono pump.

[0058] 7A , when the latent heat storage material 201 is injected into the accommodation member 211, the tip of a filling hose 241 of the cylinder pump 231 is connected to the injection port 212. In addition, the tip of a suction hose 242 of the cylinder pump 231 is inserted into the latent heat storage material 201.

[0059] 7B, the piston 243 of the cylinder pump 231 is lowered. This causes the latent heat storage material 201 to be sucked up. The sucked up latent heat storage material 201 is sucked into the inside of the cylinder 244 of the cylinder pump 231 via the suction hose 242.

[0060] 7C, the piston 243 of the cylinder pump 231 is raised. This causes the latent heat storage material 201 to be discharged from the inside of the cylinder 244 of the cylinder pump 231. The discharged latent heat storage material 201 is injected into the accommodation member 211 via the filling hose 241. The amount of the latent heat storage material 201 to be injected is not limited, but is preferably 70% or more and 90% or less of the internal volume of the accommodation member 211.

[0061] Subsequently, the injection port 212 is sealed with the sealing member 213. The sealing of the injection port 212 with the sealing member 213 is performed, for example, by welding the sealing member 213 to the injection port 212. As a result, the injection port 212 is hermetically sealed with the sealing member 213. This makes it possible to prevent the latent heat storage material 201 from leaking from the accommodating member 211. The welding of the sealing member 213 to the injection port 212 is performed by ultrasonic welding, thermal welding, or the like.

[0062] The sealing of injection port 212 with sealing member 213 may be performed by using sealing member 213 as a screw plug and screwing it onto injection port 212. This allows sealing member 213 to be a plug that can be freely opened and closed by hand.

[0063] Next, the human body cooling device 2 is left standing in an environment having a temperature equal to or lower than the solidification temperature of the latent heat storage material 201. As a result, the latent heat storage material 201 solidifies.

[0064] When the ice pack 2 is housed in a logistics packaging container, the latent heat storage material 201 is solidified before the ice pack 2 is housed in the logistics packaging container. However, if the temperature inside the logistics packaging container can be made lower than the solidification start temperature of the latent heat storage material 201 in the initial stage of the logistics process, the latent heat storage material 201 may be solidified after the ice pack 2 is housed in the logistics packaging container. This allows the ice pack 2 to be started for use while the latent heat storage material 201 is still liquid.

[0065] 3 Third embodiment 3.1 Logistics packaging containers (food cold storage equipment) FIG. 8 is a cross-sectional view that schematically illustrates a logistics packaging container 3 according to the third embodiment.

[0066] The logistics packaging container 3 keeps the refrigerated object X cold. The logistics packaging container 3 is used to transport the refrigerated object X in a cold state. The refrigerated object X is, for example, a frozen food that is kept cold at a temperature of -18°C or lower. When the refrigerated object X is a frozen food, the logistics packaging container 3 also serves as a food cooling device that keeps the frozen food cold.

[0067] As shown in FIG. 8, the logistics packaging container 3 includes the cooling device 2 of the second embodiment and a logistics packaging container main body 301.

[0068] The logistics packaging container body 301 accommodates the cooling device 2 and the object X to be insulated.

[0069] The cooling device 2 sandwiches the object X to be insulated from above and below. As a result, at least a portion of the cooling device 2 comes into contact with the object X to be insulated. This allows heat to be conducted from the object X to the cooling device 2 via the contact surface 2a between the object X and the cooling device 2. This allows the object X to be effectively insulated. It also prevents heat flowing from the outside of the logistics packaging container 3 into the inside of the logistics packaging container 3 from affecting the object X to be insulated. Therefore, the cooling device 2 can insulate the object X to a temperature near the melting point of the latent heat storage material 201. The logistics packaging container 3 is suitable for use in the storage and transportation of frozen foods that are kept at temperatures of -18°C or below.

[0070] The logistics packaging container 3 may include a heat insulating member disposed above the cooling device 2. This can improve the cooling performance of the logistics packaging container 3.

[0071] The shape, number, and posture of the cooling devices 2 during use may be changed depending on the shape, properties, etc. of the object X to be cooled.

[0072] 4 Fourth embodiment 4.1 Cooling devices Fig. 9 is a perspective view that schematically illustrates a human body cooling apparatus 4 of the fourth embodiment. Fig. 10 is a cross-sectional view that schematically illustrates a human body cooling apparatus 4 of the fourth embodiment. Fig. 10 illustrates a cross section at the position of cutting line XI-XI drawn in Fig. 9.

[0073] The cooling device 4 is a so-called film pack type cooling device.

[0074] As shown in FIGS. 9 and 10, the human body cooling tool 4 includes a latent heat storage material 401 and a human body cooling tool 402.

[0075] The latent heat storage material 401 is the latent heat storage material of the first embodiment.

[0076] As shown in FIGS. 9 and 10, the cooling device main body 402 comprises a plurality of storage sections 411 and a plurality of joint sections 412.

[0077] Each of the plurality of containing sections 411 liquid-tightly contains the phase change material 401. The phase change material 401 is contained in an internal space 411c formed in each of the plurality of containing sections 411.

[0078] Each of the plurality of storage sections 411 has a rectangular planar shape and an elliptical cross-sectional shape. Each of the plurality of storage sections 411 may have a planar shape other than the rectangular planar shape, and may have a cross-sectional shape other than the elliptical cross-sectional shape.

[0079] The ice pack main body 402 is provided with three storage sections 411. The number of storage sections 411 provided in the ice pack main body 402 may be increased or decreased. The number of storage sections 411 provided in the ice pack main body 402 is increased or decreased depending on the size of the object to be kept cold. This allows the size of the ice pack 4 to be changed depending on the size of the object to be kept cold.

[0080] 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 different melting points. When two or more types of latent heat storage materials having different melting points are stored in multiple storage sections 411, multiple objects to be kept cold at different temperatures can be kept cold simultaneously.

[0081] Each of the multiple joints 412 connects two adjacent storage sections 411 included in the multiple storage sections 411. Each of the multiple joints 412 has a joint function that allows the two storage sections 411 to move. By providing the ice pack 4 with multiple joints 412, it is possible to give the ice pack 4 a shape that conforms to the object to be kept cold, even when the latent heat storage material 401 is in a solid state. This allows the ice pack 4 to come into contact with the object over a wide area, even if the object has a complex shape. This allows the object to be kept cold effectively, even if the object has a complex shape.

[0082] 10, the cooling device main body 402 includes two film members 421. The two film members 421 are joined to each other at a plurality of joints 431 to form a plurality of joint sections 412, and are not joined to each other at the remaining sections to form a plurality of storage sections 411.

[0083] The film member 421 is made of a material that can suppress leakage and volatilization of the latent heat storage material 401. The film member 421 is also made of a material that can be bonded to each other. The film member 421 is also made of a flexible material that can impart joint functions to the multiple joint portions 412.

[0084] The material constituting the film member 421 includes, for example, at least one selected from the group consisting of polyethylene, polypropylene, polyamide, and polyester. The material constituting the film member 421 may be one type of material or a combination of two or more types of materials.

[0085] The film member 421 may be a single-layer film or a multi-layer film. The film member 421 is preferably a multi-layer film including a low-density polyethylene resin layer and a polyamide resin layer. When the film member 421 is a multi-layer film, two film members 421 are stacked so that the two low-density polyethylene resin layers included in each of the two film members 421 come into contact with each other. Furthermore, the contact surfaces of the two low-density polyethylene resin layers are thermocompression-bonded to each other. This allows the formation of multiple joint portions 412.

[0086] The film member 421 may include a substrate and a thin film disposed on the substrate. The material constituting the thin film may include at least one selected from the group consisting of aluminum and silicon dioxide. This can improve the durability and barrier properties of the film member 421.

[0087] The cooling device 4 may be provided with a temperature indicator sticker that indicates the temperature and is attached to the film member 421. This makes it possible to recognize the temperature of the cooling device 4.

[0088] The cooling device 4 may have a so-called pack-in-pack structure. When the cooling device 4 has a pack-in-pack structure, the cooling device 4 is provided with a film that wraps the film member 421. This can improve the physical strength, feel, and heat insulation of the cooling device 4.

[0089] The ice pack 4 may be attached to a fixing jig for fixing the ice pack 4 to the object to be cooled, and fixed to the object to be cooled. The fixing jig is, for example, a supporter, towel, bandage, or the like.

[0090] 4.2 Manufacturing method of cooling devices FIG. 11 is a diagram schematically illustrating a manufacturing device 441 used to manufacture the human body cooling device 4 of the fourth embodiment.

[0091] The manufacturing device 441 is a so-called vertical pillow type packaging machine that is also used for packaging food.

[0092] As shown in FIG. 11, when the cooling device 4 is manufactured, the latent heat storage material 401 stored in the thermostatic bath 451 is transported to the stirring bath 452.

[0093] Subsequently, the latent heat storage material 401 transported to the stirring tank 452 is stirred by the stirrer 453 .

[0094] Next, two films 454 are unwound from a film roll (not shown).

[0095] Subsequently, both ends of the two films 454 extending in the longitudinal direction are joined together by a former section 455 .

[0096] Next, both ends of the two joined films 454 are heat-pressed together by vertical seal portion 456. As a result, the two films 454 form a cylindrical object.

[0097] Next, the two films 454 constituting the cylindrical object are heat-pressed together by horizontal sealing section 457 along a pressure-bonding line extending in the minor axis direction of the two films 454 .

[0098] Next, the pump 459 is operated. As a result, the stirred latent heat storage material 401 is poured into the inside of the cylindrical object formed by the two films 454.

[0099] Next, the two films 454 constituting the cylindrical object are again thermocompressed by the horizontal sealing section 457 along a compression line extending in the minor axis direction of the two films 454. This forms the storage section 411 and the joint section 412. The latent heat storage material 401 is stored in the formed storage section 411.

[0100] 5 Fifth embodiment 5.1 Logistics packaging containers (food cold storage equipment) FIG. 12 is a cross-sectional view that schematically illustrates a logistics packaging container 5 according to the fifth embodiment.

[0101] The logistics packaging container 5 keeps the refrigerated object X cold. The logistics packaging container 5 is used to transport the refrigerated object X in a cold state. The refrigerated object X is, for example, a frozen food that is kept cold at a temperature of -18°C or lower. When the refrigerated object X is a frozen food, the logistics packaging container 5 also serves as a food cooling device that keeps the frozen food cold.

[0102] As shown in FIG. 12, the logistics packaging container 5 includes the cooling device 4 of the fourth embodiment and a logistics packaging container main body 501.

[0103] The physical distribution packaging container body 501 accommodates the cooling device 4 and the object X to be insulated.

[0104] The cooling device 4 covers the object X to be insulated from above. As a result, at least a portion of the cooling device 4 comes into contact with the object X. As a result, heat is conducted from the object X to the cooling device 4 via the contact surface 4a between the object X and the cooling device 4. This allows the object X to be effectively insulated. In addition, it is possible to prevent heat flowing from the outside of the logistics packaging container 5 into the inside of the logistics packaging container 5 from affecting the object X. Therefore, the cooling device 4 can insulate the object X at a temperature near the melting point of the latent heat storage material 401. Therefore, the cooling device 4 is suitable for use in insulating and transporting frozen foods that are kept cold at temperatures of -18°C or lower.

[0105] The shape, number, and posture of the cooling devices 4 during use may be changed depending on the shape, properties, etc. of the object X to be cooled.

[0106] 5.2 Variations FIG. 13 is a cross-sectional view that schematically illustrates a logistics packaging container 5A according to a modification of the fifth embodiment.

[0107] The logistics packaging container 5A differs from the logistics packaging container 5 in that it includes the ice pack 2 of the second embodiment in addition to the ice pack 4 of the fourth embodiment. The ice pack 2 is disposed between the object to be refrigerated X and the bottom surface 510a of the logistics packaging container main body 501. This makes it possible to prevent heat from flowing into the object to be refrigerated X via the bottom surface 510a of the logistics packaging container main body 501.

[0108] As described above, the cooling device 2 has a feature that the shape change is small when the latent heat storage material 201 changes from a solid to a liquid. Therefore, in the logistics packaging container 5A, the object to be refrigerated X can be stably placed on the cooling device 2.

[0109] 6 Sixth embodiment 6.1 Cooling devices Fig. 14 is a plan view that schematically illustrates a human body cooling apparatus 6 of the sixth embodiment. Fig. 15 is a cross-sectional view that schematically illustrates a human body cooling apparatus 6 of the sixth embodiment.

[0110] The cooling device 6 is a so-called blister pack type cooling device.

[0111] As shown in FIGS. 14 and 15, the human body cooling tool 6 includes a latent heat storage material 601 and a human body cooling tool 602.

[0112] The latent heat storage material 601 is the latent heat storage material of the first embodiment.

[0113] As shown in FIGS. 14 and 15, the human cooling device main body 602 includes a plurality of storage sections 611 and a plurality of joint sections 612.

[0114] Each of the plurality of containing sections 611 liquid-tightly contains the phase change material 601. The phase change material 601 is contained in an internal space 611c formed in each of the plurality of containing sections 611.

[0115] Each of the plurality of storage sections 611 has a rectangular planar shape and a trapezoidal cross-sectional shape. Each of the plurality of storage sections 611 may have a planar shape other than a rectangular planar shape, or a cross-sectional shape other than a trapezoidal cross-sectional shape.

[0116] The ice pack main body 602 is provided with six storage sections 611. The number of storage sections 611 provided in the ice pack main body 602 may be increased or decreased. The number of storage sections 611 provided in the ice pack main body 602 is changed according to the size of the object to be kept cold. This allows the size of the ice pack 602 to be changed according to the size of the object to be kept cold.

[0117] 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 different melting points. When two or more types of latent heat storage materials having different melting points are stored in multiple storage sections 611, multiple objects to be kept cold at different temperatures can be kept cold simultaneously.

[0118] When the object to be kept refrigerated has a can-like shape, contact surface 611a of storage section 611 may be a concave curved surface that fits the convex curved surface of the object to be kept refrigerated. When the object to be kept refrigerated has a tapered shape, the thickness of storage section 611 may be varied along the longitudinal direction of storage section 611.

[0119] Each of the multiple joints 612 connects two adjacent storage sections 611 included in the multiple storage sections 611. Each of the multiple joints 612 has a joint function that allows the two storage sections 611 to move. By providing the cooling device 6 with multiple joints 612, it is possible to give the cooling device 6 a shape that conforms to the object to be kept cold, even when the latent heat storage material 601 is in a solid state. This allows the cooling device 6 to come into contact with the object over a wide area, even if the object has a complex shape. This allows the object to be kept cold effectively, even if the object has a complex shape.

[0120] 15, the cooling device main body 602 includes a storage member 621 and a sealing member 622. The storage member 621 and the sealing member 622 are joined to each other at a plurality of joints 631 to form a plurality of joint sections 612, and are not joined to each other at the remaining sections to form a plurality of storage sections 611.

[0121] 15, the accommodating member 621 has a plurality of recesses 641. The sealing member 622 has a flat plate shape. The recesses 641, together with the sealing member 622, form a plurality of accommodating sections 611.

[0122] The accommodating member 621 is made of a material having a hardness that allows it to maintain the shape of the recess 641. The accommodating member 621 and the sealing member 622 are made of a material that can suppress leakage and volatilization of the latent heat storage material 601. Furthermore, the accommodating member 621 and the sealing member 622 are made of a material that can be bonded to each other. Furthermore, the accommodating member 621 and the sealing member 622 are made of a material that is flexible enough to impart joint functions to the multiple joint portions 612.

[0123] The material constituting the storage 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 storage member 621 may be one type of material or a combination of two or more types of materials.

[0124] The housing member 621 desirably has a thickness of 100 μm or more and 1000 μm or less, which makes it possible to impart flexibility to the housing member 621. This makes it possible to impart joint functions to the multiple joint portions 612.

[0125] The material constituting the sealing member 622 includes, for example, at least one selected from the group consisting of polyethylene, polypropylene, polyamide, and polyester. The material constituting the sealing member 622 may be one type of material or a combination of two or more types of materials.

[0126] The sealing member 622 desirably has a thickness of 50 μm or more and 100 μm or less, which makes it possible to impart flexibility to the sealing member 622. This makes it possible to impart joint functions to the multiple joint portions 612.

[0127] The housing member 621 and the sealing member 622 may be single-layer or multi-layer members. The housing member 621 and the sealing member 622 are preferably multi-layer members including a low-density polyethylene resin layer and a polyamide resin layer. When the housing member 621 and the sealing member 622 are multi-layer members, the housing member 621 and the sealing member 622 are stacked so that the two low-density polyethylene resin layers included in the housing member 621 and the sealing member 622 are in contact with each other. Furthermore, the contact surfaces of the two low-density polyethylene resin layers are thermocompression-bonded to each other. This allows the formation of multiple joint portions 612.

[0128] At least one of the housing member 621 and the sealing member 622 may include a base material and a thin film disposed on the base material. The material constituting the thin film may include at least one selected from the group consisting of aluminum and silicon dioxide. This can improve the durability and barrier properties of the member.

[0129] The cooling equipment 6 may be provided with a temperature-indicating sticker that indicates the temperature and is attached to at least one of the containing member 621 and the sealing member 622. This makes it possible to recognize the temperature of the cooling equipment 6.

[0130] The accommodating member 621 and the sealing member 622 may have fixing parts for maintaining the cylindrical shape of the cooling device 6. This allows the cooling device 6 to surround the object to be kept cold when the cooling device 6 is brought close to or in contact with the object to be kept cold. The fixing parts include, for example, hook-and-loop fasteners provided on the surface 621a of the accommodating member 621 and the surface 622a of the sealing member 622.

[0131] 6.2 Variations Fig. 16 is a perspective view that schematically illustrates a human body cooling apparatus 6A that is a modified example of the sixth embodiment, and Fig. 17 is a cross-sectional view that schematically illustrates a human body cooling apparatus 6A that is a modified example of the sixth embodiment.

[0132] The human cooling device 6A differs from the human cooling device 6 in that it includes a human cooling device support 651.

[0133] The cooling device support 651 has a cylindrical shape with a bottom. One end of the cooling device support 651 is open. An internal space 651c that houses the cooling device 6 is formed in the cooling device support 651. The cooling device 6 is deformed so that the accommodating member 621 is arranged radially inside and the sealing member 622 is arranged radially outside. By including the cooling device support 651, the cooling device 6A has a cylindrical shape and can stand on its own.

[0134] The cooling device support 651 is preferably made of a material that has heat insulating properties and can prevent heat exchange between the outside of the cooling device support 651 and the inside of the cooling device support 651.

[0135] The material constituting the cooling tool support 651 includes, for example, at least one selected from the group consisting of foamed polyethylene, foamed urethane, and chloroprene rubber (foamed rubber).

[0136] 17, when the cooling device 6A is in use, a can- or bottle-shaped object to be kept cold X is inserted into the cylindrical space 600c surrounded by the cooling device support 651. This allows the cooling device 6A to be brought close to or into contact with the object to be kept cold X. This allows the object to be kept cold at a temperature near the melting point of the latent heat storage material 601.

[0137] The cooling device support 651 is preferably made of an elastic material. This allows the cooling device support 651 to be elastically deformed according to the diameter of the object to be kept cold X. This allows the cooling device support 651 to be pressed against the object to be kept cold X.

[0138] 6.3 Manufacturing method of cooling device 18A to 18D are cross-sectional views that schematically illustrate intermediate products obtained when manufacturing a human body cooling apparatus 6 of the sixth embodiment.

[0139] When the cooling device 6 is manufactured, as shown in FIG. 18A, a hard film 671, which is a precursor of the containing member 621, is placed on a mold 661 in which a groove portion 661g having a trapezoidal cross section is formed.

[0140] 18B, the shape of the grooves 661g formed in the mold 661 is transferred to the hard film 671 by vacuum molding, press working, etc. In this way, the containing member 621 is formed.

[0141] Next, as shown in FIG. 18C, the liquid latent heat storage material 601 is poured into the recess 641 of the containing member 621 by a pump or the like.

[0142] 18D, the sealing member 622 is placed on the accommodating member 621. The contact surfaces of the accommodating member 621 and the sealing member 622 are then thermocompressed together to form the accommodating portion 611 and the joint portion 612.

[0143] 7 Seventh embodiment 7.1 Logistics packaging containers (food cold storage equipment) FIG. 19 is a cross-sectional view that schematically illustrates a logistics packaging container 7 according to the seventh embodiment.

[0144] The logistics packaging container 7 keeps the refrigerated object X cold. The logistics packaging container 7 is used to transport the refrigerated object X in a cold state. The refrigerated object X is, for example, a frozen food that is kept cold at a temperature of -18°C or lower. When the refrigerated object X is a frozen food, the logistics packaging container 7 also serves as a food cooling device that keeps the frozen food cold.

[0145] As shown in FIG. 19, the logistics packaging container 7 includes the cooling device 6 of the sixth embodiment and a logistics packaging container main body 701.

[0146] The physical distribution packaging container body 701 accommodates the cooling device 6 and the object X to be insulated.

[0147] The cooling device 6 covers the object X to be insulated from above. As a result, at least a portion of the cooling device 6 comes into contact with the object X. As a result, heat is conducted from the object X to the cooling device 6 via the contact surface 6a between the object X and the cooling device 6. This allows the object X to be effectively insulated. In addition, it is possible to prevent heat flowing from the outside of the logistics packaging container 7 into the inside of the logistics packaging container 7 from affecting the object X. Therefore, the cooling device 6 can insulate the object X at a temperature near the melting point of the phase change material 601. Therefore, the cooling device 6 is suitable for use in the insulated and transported frozen foods that must be maintained at a temperature of -18°C or below.

[0148] The logistics packaging container 7 may include a heat insulating member disposed above the cooling device 6. This can improve the cooling performance of the logistics packaging container 7.

[0149] In the logistics packaging container 7, the surface 621a of the containing member 621 and the bottom surface 701a of the logistics packaging container main body 701 may be fixed to each other by a hook-and-loop fastener or the like.

[0150] The present disclosure is not limited to the above-described embodiments, and may be replaced with a configuration that is substantially the same as the configuration shown in the above-described embodiments, a configuration that has the same effect, or a configuration that can achieve the same purpose. [Explanation of symbols]

[0151] 2 Cooling device, 3 Logistics packaging container, 4 Cooling device, 5 Logistics packaging container, 5A Logistics packaging container, 6 Cooling device, 6A Cooling device, 7 Logistics packaging container, 201 Phase change material, 202 Cooling device main body, 301 Logistics packaging container main body, 401 Phase change material, 402 Cooling device main body, 411 Storage section, 412 Joint section, 501 Logistics packaging container main body, 601 Phase change material, 602 Cooling device main body, 611 Storage section, 612 Joint section, 621 Storage member, 622 Sealing member, 701 Logistics packaging container main body

Claims

[Claim 1] A composition comprising ammonium chloride, ammonium bromide, water, and a water-insoluble supercooling inhibitor, wherein the total of 3.5 to 22.5 parts by weight of the ammonium chloride, 6.5 to 25.5 parts by weight of the ammonium bromide, and the water is 100 parts by weight; The composition contains 1 to 10 parts by weight of the water-insoluble supercooling inhibitor, the water-insoluble supercooling inhibitor is any one of calcium carbonate, aluminum oxide, and activated carbon; Has a melting temperature in the range of -18°C to -20°C Latent heat storage material.

Images