JP2017172825A - Cold insulation method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To keep a cooled object at a desired temperature as long as possible and carry the cooled object while cooling it at the desired temperature, when cooling the cooled object at the desired temperature using a frozen refrigerant and an unfrozen refrigerant.SOLUTION: An item 2 is housed in a further inner box 40, the further inner box 40 in which the item 2 is housed is housed in an inner box 10, an unfrozen refrigerant 31 is housed in a periphery of the further inner box 40, the inner box 10 in which the further inner box 40 and the unfrozen refrigerant 31 are housed is housed in an outer box 20, and a frozen refrigerant 32 is housed in a periphery of the inner box 10.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a cold-retaining method for keeping an object to be kept cold, and more particularly, to a cold-retaining method for keeping an object to be kept cold at a constant temperature using a frozen cryogen and an unfrozen cryogen.

  Conventionally, foods and the like are kept cold at a constant temperature using a cold-retaining agent. A generally used cryogen having a melting point of 0 ° C. or lower is used, for example, after being cooled in a freezer at a low temperature of about −25 ° C. and then taken out from the freezer. For this reason, if the cold-retaining agent is used in a state where it is taken out from the freezer, the object to be kept cold such as food is cooled to 0 ° C. or lower.

  Among the objects to be kept cold by using the cold-retaining agent as described above, there are some which are preferably not kept at a temperature of about 2 to 8 ° C. and not more than 0 ° C. Thus, when such a cold object is kept at a predetermined temperature, it is used after the cryogen is taken out from the freezer and then left at room temperature or in a refrigerator for a certain period of time. It is also conceivable to cool the object to be cooled through a heat insulating material or the like.

  However, it is not efficient to take out the cryogen from the freezer and leave it for a certain period of time. In addition, in the case where the object to be cooled is kept cold through a heat insulating material or the like, the cold air of the cryogen is only slowly transmitted to the object to be cooled, and the cold object is cooled too much. .

  Here, two types of cryogens having different melting points are used, one of the cryogens is placed around the object to be cooled in an unfrozen state, and the other cryogen is frozen and the outside of the unfrozen cryogen A technique for keeping the object to be cooled at a constant temperature by placing it in contact with the heat sink is disclosed in Patent Document 1.

International Publication No. 2012-015881

  As described above, when placing an unfrozen cryogen around the object to be cooled and placing the frozen cryogen in contact with the unfrozen cryogen on the outside, the frozen cryogen and unfrozen The presence of the cryogen in the same space greatly changes the temperature at which the object to be kept cool depends on the size and amount of the frozen and unfrozen cryogen. There is a risk that the temperature cannot be kept cool. In addition, when the unfrozen cryogen disposed around the object to be cooled and the frozen cryogen disposed outside thereof are in contact with each other, the unfrozen cryogen is frozen in a short time, As a result, the object to be cooled is cooled too much.

  Therefore, the object to be cooled is accommodated in the inner box, the unfrozen cryogen is accommodated around the object to be cooled in the inner box, and the inner box containing the object to be cooled and the unfrozen cryogen is stored in the outer box. And storing the frozen cryogen around the inner box of the outer box, so that the inner space between the space containing the unfrozen cryogen and the space containing the frozen cryogen is stored. It is conceivable to solve these problems by making these two spaces separate by interposing the bottom, side or lid surface of the box.

  However, even in that case, if the temperature of the unfrozen cryogen is lower than the desired temperature due to the existence of the object to be cooled in the same space as the unfrozen cryogen, The temperature around the cold insulation becomes the temperature of the unfrozen cryogen in a short time, and the cold preservation is too cooled.

  In addition, when a cold object is taken out of the cold storage container in order to take it out of the cold storage container and carry it, the cold object will be immediately exposed to the outside air. However, there is a problem that it is not preferable.

  The present invention has been made in view of the problems of the conventional techniques as described above, and in the case where an object to be cooled is kept at a desired temperature using a frozen cryogen and an unfrozen cryogen. Another object of the present invention is to provide a method for keeping cold to be kept at a desired temperature for as long a time as possible and to carry the object to be kept while being kept at a desired temperature.

In order to achieve the above object, the present invention provides:
A cold-retaining method for keeping an object to be cooled using a frozen cryogen and an unfrozen cryogen,
A rectangular first box having a heat insulation property, containing a cooled object that has been pre-cooled to a temperature corresponding to a cold temperature of the cooled object;
The frozen cryogen;
The unfrozen cryogen;
A rectangular second box containing the first box and the unfrozen cryogen;
The second box and the rectangular third box that contains the frozen cryogen, which is made of a heat insulating material,
The first box enclosed in the second box is surrounded by an unfrozen cryogen contained in the second box, and the first box is contained in the third box. And the second box containing the unfrozen cryogen is surrounded by the frozen cryogen contained in the third box.

  In the present invention configured as described above, the object to be cooled is accommodated in the first box, and the first box in which the object to be cooled is accommodated is accommodated in the second box. An unfrozen cold-retaining agent is accommodated around one box, and a first box and a second box containing an unfrozen cryogen are accommodated in a third box made of a heat insulating material. Since the frozen cryogen is accommodated around the second box, the space in which the unfrozen cryogen is accommodated and the space in which the frozen cryogen is accommodated are separated into two spaces. The temperature balance in the space makes it easier to keep the object to be cooled at a desired temperature for a long time. Further, at this time, the object to be cooled is kept at a desired cold temperature by being stored in the first box having heat insulation in a state precooled to a temperature corresponding to the cold temperature of the cold object. This state is maintained for a certain period of time. After that, the object to be cooled is cooled by the temperature of the unfrozen cryogen, but the object to be cooled is accommodated in the first box, and the unfrozen cryogen is placed around the first box. By being accommodated, the temperature due to the unfrozen cryogen will be slowly transmitted to the object to be cooled, and in the event that the temperature of the unfrozen cryogen is lower than the desired temperature Even if it exists, a to-be-cooled material will not be cooled too much in a short time. Further, after that, even when the cold insulation effect of the cold insulation agent is lost, the object to be kept cold is kept cold for a certain time by providing the first box with heat insulation. Furthermore, when taking out the object to be cooled and carrying it, if the object to be cooled is taken out in a state of being accommodated in the first box, the object to be cooled will not be immediately exposed to the outside air, and the first box will have heat insulation properties. By being provided, the object to be cooled is kept cold for a certain time.

  Moreover, if the 1st box is covered with the aluminum vapor deposition sheet, especially when carrying a to-be-cooled object in the state accommodated in the 1st box, the cool-keeping effect by a 1st box will improve.

  According to the present invention, the space in which the unfrozen cryogen is accommodated and the space in which the frozen cryogen is accommodated are separate spaces, and the object to be cooled is kept for a long time due to the temperature balance in the two spaces. It becomes easy to keep at a desired temperature. At this time, the object to be cooled is pre-cooled to a temperature corresponding to the cold temperature of the object to be cooled, and is stored in the first box having heat insulation, so that it is kept at a desired cold temperature. The state can be maintained for some time. Moreover, even if it is a case where the temperature of the unfrozen cold-retaining agent becomes lower than desired temperature because the first box has heat insulation, the object to be cooled is cooled too much in a short time. In addition, it is possible to keep the object to be cooled for a certain period of time even when the cooling effect of the cryogen is lost. Furthermore, when taking out and carrying a to-be-cooled thing, it can continue to cool a to-be-cooled object for a fixed time by taking out the to-be-cooled object in the state accommodated in the 1st box.

BRIEF DESCRIPTION OF THE DRAWINGS It is an external appearance perspective view which shows one Embodiment of the cold storage container used for the cold storage method of this invention, (a) is a figure which shows the structure of the inner box which comprises a cold storage container, an inner box, and an outer box, (b) is It is the figure where the inner box and the inner box were accommodated in the outer box. It is a figure for demonstrating the method of accommodating an inner box and the frozen cryogen in an outer box, when hold | maintaining articles | goods using the cold storage container shown in FIG. The figure for demonstrating the method of accommodating the inner box in which the articles | goods were accommodated, and the unfrozen cold-retaining agent in the inner box accommodated in the outer box, when articles | goods are kept cold using the cold storage container shown in FIG. It is. It is a figure which shows the state in which the articles | goods and the cold insulating agent were accommodated in the cold storage container shown in FIG. 1, (a) is the figure which looked at the inner box, the inner box, and the outer box from the side, (b) is an inner box. It is the figure which looked at the inside of an inner box and an outer box from the cover surface side. It is a figure for demonstrating the effect when articles | goods are accommodated with the cold insulating agent in the cold insulating container shown in FIG. It is a figure which shows the state from which the articles | goods accommodated in the cold storage container shown in FIG. 1 are taken out from an outer box. It is a figure which shows other embodiment of the inner box used for the cold storage container shown in FIG. 1, (a) is an external appearance perspective view, (b) is a figure which shows the state which took out the inner box.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is an external perspective view showing an embodiment of a cold insulation container used in the cold insulation method of the present invention, (a) is a diagram showing the configuration of an inner box, an inner box and an outer box constituting the cold insulation container, (B) is the figure where the inner box and the inner box were accommodated in the outer box.

  As shown in FIG. 1, the cold storage container in this embodiment has a rectangular inner box 40 serving as a first box, a rectangular inner box 10 serving as a second box, and a rectangular box serving as a third box. And an outer box 20.

The inner box 40 includes a cover surface 41 made of a heat insulating material such as polystyrene foam (EPS), side surfaces 42a to 42d, and a bottom surface, and the cover surface 41 is configured to be openable and closable by a hinge or the like. Here, examples of the heat insulating material include a foamed layer, a porous material, a fine void, and the like, a material having an air layer such as corrugated cardboard and a bubble cushioning material, and a vacuum heat insulating material. Further, as the heat insulating material, preferably heat transmission coefficient is not more than 30 w / m ² K, more preferably at most 15w / m ² K.

  The inner box 10 includes a cover surface 11 made of a heat insulating material such as cardboard, side surfaces 12a to 12d, and a bottom surface, and the cover surface 11 is configured to be openable and closable by a hinge or the like.

  The outer box 20 includes a lid surface 21 made of a heat insulating material such as polystyrene foam, side surfaces 22a to 22d, and a bottom surface, and the lid surface 21 is configured to be opened and closed by a hinge or the like.

  The inner box 40, the inner box 10 and the outer box 20 configured as described above are accommodated in the area surrounded by the side surfaces 12a to 12d and the bottom surface of the inner box 10, and the inner box 40 is accommodated. The inner box 10 is accommodated in a region surrounded by the side surfaces 22 a to 22 d and the bottom surface of the outer box 20.

  Below, the cold insulation method using the cold insulation container comprised as mentioned above is demonstrated.

  When the article to be cooled is to be kept cold using the cold container shown in FIG. 1, first, the inner box 10 and the frozen cryogen 32 are accommodated in the outer box 20.

  FIG. 2 is a view for explaining a method of accommodating the inner box 10 and the frozen cold-retaining agent 32 in the outer box 20 when the article is cooled using the cold container shown in FIG. It is the figure which looked at from the lid surface 21 side.

  When the article is kept cold using the cold insulation container shown in FIG. 1, first, as shown in FIG. 2 (a), the inner box 10 is put into the outer box 20 from the lid face 21 side with the lid face 21 open. Accommodate. Then, a space 25 is generated between the inner box 10 and the side surfaces 22a to 22d.

  Next, as shown in FIG.2 (b), the frozen cold insulating agent 32 is accommodated in the space 25 produced between the inner box 10 and side surface 22a-22d. Thereby, it will be in the state made into the arrangement | positioning which the cryogen 32 which frozen the circumference | surroundings of the inner box 10 surrounded. Further, the inner box 10 may be accommodated after the frozen coolant 32 is placed on the bottom surface of the outer box 20 in advance. In addition, as the cooling agent 32, the thing which has water as a main component and has melting | fusing point -3 degreeC-0 degreeC is used, and it is in the frozen state by being cooled below melting | fusing point. In addition, since the frozen cryogen 32 has free standing due to being frozen, it may be stored in the outer box 20 before the inner box 10 is stored in the outer box 20.

  Next, with respect to the inner box 40, the article 2 is accommodated in the inner box 40 from the lid surface 41 side in a state where the lid surface 41 is opened. The article 2 is pre-cooled to a desired temperature to be kept cold.

  Next, the inner box 10 accommodated in the outer box 20 accommodates the inner box 40 and the unfrozen cryogen.

  FIG. 3 shows that when an article is kept cold using the cold insulation container shown in FIG. 1, the inner box 10 accommodated in the outer box 20 and the inner box 40 in which the article 2 is accommodated and the unfrozen cryogen 31 are contained. It is a figure for demonstrating the method to accommodate, and is the figure which looked at the inside of the inner box 10 from the cover surface 11 side.

  First, as shown in FIG. 3A, the inner box 40 is accommodated in the inner box 10 from the lid surface 11 side with the lid surface 11 open. Then, a space 15 is generated between the inner box 40 and the side surfaces 12a to 12d.

  Next, as shown in FIG.3 (b), the unfrozen cold insulating agent 31 is accommodated in the space 15 produced between the inner box 40 and the side surfaces 12a-12d. Thereby, it will be in the state set as the arrangement | positioning which the circumference | surroundings of the inner box 40 surround the unfrozen cryogen 31. Further, when the inner box 40 is accommodated in the inner box 10, a space 15 is also generated between the inner box 40 and the lid surface 11 of the inner box 10, and thus the unfrozen cold-retaining agent 31 is also accommodated in this space 15. In addition, the inner box 10 may be accommodated on the bottom surface of the inner box 10 after the cooling agent 31 is placed in advance. At this time, if the cold insulation agent 31 is accommodated between the inner box 40 and the side surfaces 12a to 12d and the lid surface 11 without a gap, the cold insulation agent 31 serves as a cushion when the inner case 10 is carried and the article 2 Damage or the like can be avoided. In addition, as the cooling agent 31, the thing which has water as a main component and melting | fusing point is -3 degreeC-0 degreeC may be used, and you may pre-cool to the temperature which wants to keep the goods 2 with the goods 2.

  After accommodating the inner box 40 and the unfrozen cryogen 31 in the inner box 10 in this way, the lid surface 11 of the inner box 10 is closed and also between the inner box 10 and the lid surface 21 of the outer box 20. Since the space 25 is generated, the frozen coolant 32 is accommodated in the space 25 and the lid surface 21 of the outer box 20 is closed.

  FIG. 4 is a view showing a state in which the article 2 and the cryogens 31 and 32 are accommodated in the cold insulation container shown in FIG. 1, and (a) shows the inner side box 40, the inner box 10, and the outer box 20 inside the side face 22 a. The figure seen from the side, (b) is the figure which looked at the inside box 40, the inner box 10, and the outer box 20 from the cover surface 21 side.

  As described above, the article 2 is accommodated in the inner box 40, the inner box 40 in which the article 2 is accommodated is accommodated in the inner box 10, and is not frozen around the inner box 40 in the inner box 10. The cooler 31 is stored, and the inner box 10 and the inner box 10 in which the unfrozen cooler 31 is stored are stored in the outer box 20, and the inner box 10 in the outer box 20 is frozen around the inner box 10. When the agent 32 is accommodated, as shown in FIG. 4, the inner box 40 in which the article 2 is accommodated, the frozen cryogen 32, the unfrozen cryogen 31, the inner box 10, and the outer box 20 However, the inner box 40 is surrounded by an unfrozen cryogen 31 and the inner box 40 containing the article 2 and the inner box 10 containing the unfrozen cryogen 31 are surrounded by a frozen cryogen 32. Arrangement.

  Below, the effect when the articles | goods 2 are accommodated as mentioned above in the cold storage container shown in FIG. 1 is demonstrated.

  FIG. 5 is a diagram for explaining the effect when the article 2 is accommodated in the cold insulation container shown in FIG. 1 together with the cold insulation agents 31 and 32. The inside of the outer box 20 and the inner box 10 are viewed from the side surface 22a side. FIG.

  As described above, the inner box 40 containing the article 2 is surrounded by the unfrozen cryogen 31 and the inner box 40 containing the article 2 and the inner box 10 containing the unfrozen cryogen 31 are In a state of being surrounded by the frozen cooling agent 32, the unfrozen cooling agent 31 is interposed between the inner box 40 in which the article 2 is stored and the frozen cooling agent 32.

Then, as shown in FIG. 4, first, by the exchange of the thermal energy J ₁ between the frozen cryogen 32 and the unfrozen cryogen 31, the uncooled cryogen 31 is cooled by the cold air from the frozen cryogen 32. To be cooled. At that time, the side surfaces 12a to 12d or the lid surface 11 of the inner box 10 are interposed between the unfrozen cryogen 31 and the frozen cryogen 32, so that the unfrozen cryogen 31 can be kept in a short time. Will not freeze. Further, if the outer box 20 is made of a heat insulating material having a higher heat insulating effect than the inner box 10, while the heat from the outside of the outer box 20 is blocked, the cold air generated by the frozen cooling agent 32 is not frozen. Can be transmitted efficiently.

The inside of the inner box 40 is cooled by the cold air of the non-frozen cooling agent 31 by exchanging the thermal energy J ₂ between the unfrozen cooling agent 31 and the inner box 40 cooled by the frozen cooling agent 32. Keep cool.

  In this way, the inner box 40 that houses the article 2 is indirectly cooled by the frozen cooling agent 32 through the unfrozen cooling agent 31. Thereby, since the temperature in the inner box 40 does not become lower than the melting point of the unfrozen cryogen 31, by using the cryogen 31 having a melting point matched to a predetermined temperature for keeping the article 2 cold, The article 2 is kept cold at a desired temperature, and it can be avoided that the article 2 is cooled too much. At this time, the inner box 40 is accommodated in the inner box 10, and the unfrozen cryogen 31 is accommodated around the inner box 40, while the inner box 40 and the unfrozen cryogen 31 are accommodated in the outer box 20. Is stored in the inner box 10 and the frozen cryogen 32 is accommodated around the inner box 10, so that a space in which the unfrozen cryogen 31 is accommodated, and the frozen cryogen 32 is stored. The space in which the article 2 is stored becomes a separate space, and the temperature balance in the two spaces makes it easy to keep the article 2 at a desired temperature for a long time.

  At this time, since the inner box 40 is made of a heat insulating material, the article 2 is stored in the inner box 40 in a state of being pre-cooled to a desired temperature to be kept cold. The state kept at the temperature is maintained for a certain period of time. Thereafter, as described above, the article 2 is cooled by the cold air of the unfrozen cryogen 31. However, since the article 2 is housed in the inner box 40 made of a heat insulating material, the unfrozen cryogen 31 is stored. The cool air is slowly transmitted to the article 2 through the lid surface 41, the side surfaces 42a to 42d and the bottom surface 43 of the inner box 40, so that by any chance the temperature of the unfrozen cryogen 31 is set to the desired temperature. Even if it becomes lower than this, the article 2 will not be cooled too much in a short time. After that, even when the cold insulation effect of the cold insulation agent 31 is lost, the inner box 40 has a heat insulating property, so that the article 2 is kept cold for a certain time.

  The temperature at which the article 2 is pre-cooled is not limited to the temperature at which the article 2 is desired to be kept cool, but the cold insulation performance of the cryogens 31 and 32, the heat insulation of the inner box 40, the inner box 10 or the outer box 20, or the article 2 is carried. Depending on the time or the like, the temperature is set according to the temperature at which the article 2 is to be kept cool.

  Next, the effect when the article 2 is taken out from the outer box 20 and carried will be described.

  FIG. 6 is a view showing a state in which the article 2 accommodated in the cold insulation container shown in FIG. 1 is taken out from the outer box 20.

  When taking out the article 2 accommodated in the cold storage container as described above, first, as shown in FIG. 6A, the lid surface 21 of the outer box 20 is opened and frozen on the lid surface 11 of the inner box 10. If the cold-retaining agent 32 is placed, it is removed.

  Next, as shown in FIG. 6B, the lid surface 11 of the inner box 10 is opened, and if an unfrozen cold-retaining agent 31 is placed on the lid surface 41 of the inner box 40, it is taken out.

  Then, as shown in FIG. 6C, the inner box 40 is taken out from the inner box 10.

  The article 2 taken out from the outer box 20 is carried in a state of being housed in the inner box 40 as shown in FIG. Thereby, the article 2 taken out from the outer box 20 is not immediately exposed to the outside air, and the lid surface 41, the side surfaces 42a to 42d and the bottom surface 43 of the inner box 40 are made of a heat insulating material. Thus, the article 2 is kept cold for a certain time.

  In this embodiment, the inner box 10 is housed in the outer box 20, the frozen refrigerant 32 is housed around the inner box 10, and then the inner box 40 containing the article 2 is placed in the inner box 10. While storing the unfrozen cryogen 31 around the inner box 40, the inner box 10 holds the inner box 40 containing the article 2 in the inner box 10 and unfrozen around the inner box 40. The cryogen 31 is accommodated, and then the inner box 10 and the inner box 10 in which the unfrozen cryogen 31 is accommodated are accommodated in the outer box 20, and the frozen refrigerant 32 is accommodated around the inner box 10. Or, after the inner box 10 is accommodated in the outer box 20, the inner box 10 is accommodated with the inner box 40 in which the article 2 is accommodated, and the uncooled cooling agent 31 is accommodated around the inner box 40, The outer box 20 contains the cryogen 32 frozen around the inner box 10. It may be interest. By doing in this way, the inner box 40 in which the article 2 is accommodated, the frozen cooling agent 32, the unfrozen cooling agent 31, the inner box 10, and the outer box 20, the inner box 40 is not frozen. The inner box 10 and the inner box 10 containing the unfrozen cryogen 31 are surrounded by the frozen cryogen 32.

(Other embodiments)
FIG. 7 is a view showing another embodiment of the inner box used in the cold insulation container shown in FIG. 1, (a) is an external perspective view, and (b) is a view showing a state in which the inner box 60 is taken out. It is.

  As shown in FIG. 7, the inner box in this embodiment is configured such that an inner box 60 is accommodated in an aluminum bag 50 so as to be removable.

  The inner box 60 is made of corrugated cardboard or the like, and is composed of a lid surface 61, a side surface 62, and a bottom surface, like the inner box 40 shown in FIG. 1, and the lid surface 61 can be freely opened and closed.

  The aluminum bag 50 is made of an aluminum vapor-deposited sheet in which aluminum is vapor-deposited on a sheet of cloth or the like, and includes a bag portion 51 in which the inner box 60 is accommodated and a lid portion 52 that closes the opening of the bag portion 51. ing. A zipper 53 is attached to each of the periphery of the lid portion 52 and the opening portion of the bag portion 51, and the opening portion of the bag portion 51 is closed by the lid portion 52 by meshing the zipper 53. Become.

  When the inside box configured as described above is used, the article 2 is accommodated in the inner box 60 with the lid surface 61 opened, the lid surface 61 is closed, and the article 2 is opened with the lid portion 52 opened. The accommodated inner box 60 is accommodated in the bag portion 51 of the aluminum bag 50, the lid portion 52 of the aluminum bag 50 is closed, and the zipper 53 is engaged to close the opening of the bag portion 51. Alternatively, in a state where the inner box 60 is accommodated in the bag portion 51 of the aluminum bag 50, the lid surface 61 of the inner box 60 and the lid portion 52 of the aluminum bag 50 are opened, and the article 2 is accommodated in the inner box 60. By closing the lid surface 61 of 60 and the lid portion 52 of the aluminum bag 50 and engaging the zipper 53, the opening of the bag portion 51 is closed. Thereby, the inner box is in a state in which the bottom surface, the side surface, and the lid surface are covered with the aluminum vapor deposition sheet.

  Thereafter, the inner box in which the inner box 60 is accommodated in the aluminum bag 50 as described above will be accommodated in the inner box 10 together with the unfrozen cooling agent 31, but the inner box of this embodiment is used. The cold insulation effect due to the heat insulation performance of the inner box can be improved by the aluminum bag 50.

2 Items 10 Inner box 11, 21, 41, 61 Lid surface 12a-12d, 22a-22d, 42a-42d, 62 Side surface 13, 23 Bottom surface 15, 25 Space 20 Outer box 31, 32 Coolant 40 Inner box 50 Aluminum bag 51 Bag part 52 Lid part 53 Zipper 60 Middle box

Claims (1)

A cold-retaining method for keeping an object to be cooled using a frozen cryogen and an unfrozen cryogen,
A rectangular first box having a heat insulation property, containing a cooled object that has been pre-cooled to a temperature corresponding to a cold temperature of the cooled object;
The frozen cryogen;
The unfrozen cryogen;
A rectangular second box containing the first box and the unfrozen cryogen;
The second box and the rectangular third box that contains the frozen cryogen, which is made of a heat insulating material,
The first box enclosed in the second box is surrounded by an unfrozen cryogen contained in the second box, and the first box is contained in the third box. And the cold-retaining method which makes it the arrangement | positioning which surrounds the said 2nd box in which the said non-frozen cold-retaining agent was accommodated with the frozen cold-retaining agent accommodated in the said 3rd box.

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