JP2008281251A - Cooling storage agent container - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cooling storage agent container capable of using a container for freezing a cooling storage agent, efficiently freezing a number of cooling storage agents, and having a function capable of reserving cold of cold storage objects of which commercial value is deteriorated when frozen, such as leaf vegetable, Tofu, emulsified cosmetics and the like, while preventing damage by freezing. <P>SOLUTION: In this cooling storage agent container 10 in which the cooling storage agent is filled in a spatial portion 12 held between a pair of flat plate-shaped container wall portions 11A, 11B opposed to each other, one 11A of the pair of flat plate-shaped container wall portions 11A, 11B is provided with a number of hollow projecting portions 13 formed by projecting a part of the flat plate-shaped container wall portion 11A to an outer side of the container, the other 11B of the pair of flat plate-shaped container wall portions 11A, 11B is provided with recessed portions 14 sagging to the projecting portions 13 at the parts opposed to the projecting portions 13, the hollow portions 15 of the projecting portions 13 and the spatial portion 12 are blocked by wall portions of the recessed portions 14, and the hollow portions 15 are not filled with the cooling storage agent. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a cold storage container that can prevent freezing or overcooling (freezing failure) due to supercooling of a cold object such as a food or an emulsified article and maintain an appropriate refrigerated state of the cold object.

  2. Description of the Related Art Conventionally, a cold storage agent container that is used by being filled with a cold storage agent is widely known. The regenerator is frozen in advance and used to cool the cold object. For cooling the object to be cooled by the cold storage agent, latent heat in the phase change between the solid and the liquid of the cold storage agent is used. The cool storage agent container is filled and sealed with the cool storage agent, and then stored in a freezer or the like, so that the cool storage agent is frozen. The regenerator container in which the regenerator is frozen is usually used by being stored in a cool box or the like that can keep the internal temperature at a low temperature for a certain period of time together with a cold object such as food. The cold storage object stored in the cold storage box together with the cold storage container is maintained in an appropriate refrigerated state during storage or transportation by the cold storage agent filled in the cold storage container.

The cool storage agent filled in the cool storage agent container is cooled to the temperature in the freezer by storing the cool storage agent container in the freezer. For example, even if the regenerator stored in the freezer causes a phase change at 0 ° C., if the temperature in the freezer is set to −20 ° C. and the storage time is sufficiently long, the regenerator is − Subcooled to near 20 ° C.
In this way, the regenerator container filled with the supercooled regenerator is in contact with an article that is easy to freeze and whose commercial value is impaired when frozen, such as foods such as leafy vegetables and tofu and emulsified cosmetics. If this is the case, the sensible heat of the cool storage agent [corresponding to the change from the temperature of the supercooled cool storage agent (near the temperature in the freezer in which the cool storage agent is stored) to the temperature at which the phase change of the cool storage agent starts. There is a problem that a part of the article freezes depending on the amount of heat, that is, a so-called freezing failure occurs.

Occurrence of refrigeration failure can be prevented by taking out the cool storage agent container filled with the supercooled cool storage agent from the freezer, leaving it at room temperature for a while, taking the sensible heat of the cool storage agent, and using it. In addition, it takes a considerable amount of time to raise the temperature of the regenerator to a temperature at which refrigeration does not occur, and there are also problems such as condensation, and it is necessary to secure a large space when handling a large number of regenerator containers. .
In addition, as another means of preventing refrigeration, there is a method of inserting a heat insulating material between a regenerator container filled with a supercooled regenerator and an article such as leafy vegetables. Circulation is hindered, and there is a drawback that the object to be cooled cannot be efficiently cooled.

Examples of techniques for improving the regenerator and the regenerator container include, for example, a regenerator (see Patent Document 1) coated with a resin sheet having a large number of protruding heat insulation portions on the surface, the inside and outside of the container by changing the thickness, etc. A regenerator container (see Patent Document 2) that adjusts the heat transfer rate between and a body bag, a layer made of a regenerator and a layer made of synthetic resin foam granules that act as a heat insulator An insulated cold bag (Patent Document 3) has been proposed.
However, the regenerators described in Patent Documents 1 to 3 are such that the container filled with the regenerator is a flexible and irregular bag-like material and not a fixed container, so the frozen regenerator is deformed. There was a problem that it could not be put in the cold box or it was bulky and caused inconvenience in storage. In addition, it is difficult to store such an irregular cool storage agent without creating a useless space in the cool storage agent freezing container like the cool storage agent filled in a fixed container. Are stored together in a container for freezing cold storage agent, and the freezing cannot be performed efficiently at the same time, and there is a problem that a large size of equipment is required for freezing many cold storage agents.

In addition, by forming protrusions at multiple locations on the outer surface of the container in which the regenerator is enclosed, the area of direct contact with the object to be cooled is reduced, the cooling effect by the regenerator is improved, and the freezing obstacle of the object to be refrigerated A technique for preventing the above has been proposed (see Patent Documents 4 and 5).
However, the regenerators and the like described in Patent Documents 4 and 5 are filled with the cold storage agent in the projecting part that is in contact with the object to be cooled, so that the heat capacity of the projecting part is large and refrigeration failures are completely prevented. I can't do it. In addition, when the protrusion is designed to be small, the heat capacity is reduced and the occurrence of refrigeration is suppressed. However, when the protrusion is small, the pressure on the object to be cooled at the contact point between the protrusion and the object to be cooled is reduced. Therefore, in particular, when the object to be cooled is soft, there is a risk that the object to be cooled is deformed or hurts.

Moreover, as an improvement technique of the cold storage box in which the cold storage agent is stored together with the cold storage object, for example, the container main body in which the cold storage object is stored and the upper portion of the container main body can be detachably fitted to store the cold storage agent. A cold container (see Patent Document 6) configured with a simple lid has been proposed. In this cold storage container, the cold storage agent is installed in an inner lid type, that is, the cold storage agent is installed above the cold object and at a position away from the cold object, so that the freezing obstacle of the cold object due to the cold storage agent is Is unlikely to occur.
However, in the cold storage container described in Patent Document 6, when a large number of objects to be cooled are stored in the container body, the objects to be stored in the vicinity of the lid in which the cold storage agent is stored are subject to refrigeration. In some cases, the technology for preventing refrigeration damage was incomplete.

Japanese Utility Model Publication No. 6-81297 JP 2001-66036 A JP 2001-61882 A Japanese Utility Model Publication No.59-25075 JP 2005-291673 A Japanese Utility Model Publication No. 63-180578

  The present invention has been made in view of the above points, and can use a container for freezing cold storage agent, can efficiently freeze a large number of cold storage agents, food such as leafy vegetables and tofu, and emulsified cosmetics. An object of the present invention is to provide a cold storage agent container that can cool a cold object whose commercial value is impaired when it is frozen, while preventing freezing damage.

Conventionally, in the cool storage agent container, from the viewpoint of preventing deformation of the container due to the volume expansion of the cool storage agent, each of a plurality of opposing portions of the pair of flat container wall portions is depressed, and the depressed flat plate container A plurality of reinforcing recesses are formed by joining the inner surfaces of the wall portions (see, for example, JP-A-2007-24427). A regenerator container having such reinforcing recesses can be easily manufactured by a blow molding method, which is a general method for manufacturing this type of regenerator container.
As a result of intensive studies to achieve the above object, the present inventors applied the technology for forming the concave portion for reinforcement to a technology for preventing refrigeration failure, and provided a plurality of convex portions not filled with the cold storage agent on the outer surface of the cold storage agent container. By forming the individual pieces, the distance between the cold storage agent, which is a cooling source, and the object to be cooled can be appropriately maintained by the convex portions, and it is possible to keep the object to be cooled without causing a freezing failure. I found out.

  The present invention has been made on the basis of the above knowledge, and in a cold storage agent container in which a cold storage agent is filled in a space portion sandwiched between a pair of opposed flat plate wall portions, the pair of flat plate wall portions On one side, a plurality of hollow convex portions are formed with a part of the flat container wall portion protruding outward from the container, and the other of the pair of flat container wall portions is opposed to the convex portion. A concave portion is formed in which the concave portion is depressed toward the convex portion, the hollow portion of the convex portion and the space portion are blocked by the wall portion of the concave portion, and the hollow portion is not filled with the cold storage agent. The above object is achieved by providing a cool storage agent container configured as described above.

  According to the cool storage agent container of the present invention, since the convex portion forming surface is formed with a plurality of hollow convex portions that are not filled with the cool storage agent, the cold object is arranged on the convex portion forming surface side. Thus, it is possible to maintain an appropriate refrigerated state while preventing the occurrence of freezing failure of the object to be cooled.

  Hereinafter, a preferred embodiment of the cool storage agent container of the present invention will be described with reference to the drawings. The cool storage agent container of this embodiment is shown by FIGS.

  The cool storage agent container 10 of the present embodiment is a fixed hollow container in which a space 12 sandwiched between a pair of opposed flat plate wall portions 11A and 11B is filled with a cool storage agent (not shown). is there. A plurality of hollow convex portions 13 in which a part of the container wall 11A protrudes outward from the container are formed on the container wall 11A which is one of the pair of container walls 11A and 11B. The container wall 11B, which is the other of the portions 11A and 11B, is formed with a concave portion 14 in which a portion facing the convex portion 13 is depressed toward the convex portion 13. The hollow portion 15 and the space portion 12 of the convex portion 13 are blocked by the wall portion 14A of the concave portion 14, and the hollow portion 15 is configured not to be filled with a cold storage agent.

  The container wall portion 11A forms the container surface (convex portion forming surface) that contacts the object to be cooled via the convex portion 13, and the container wall portion 11B forms the container back surface (concave forming surface), both of which are in plan view. And substantially has a rectangular shape. Four plate-like container peripheral walls 11C forming the container side surfaces are connected to the container wall portions 11A and 11B, and the regenerator container 10 has a substantially rectangular parallelepiped shape as a whole. One of the four container peripheral walls 11 </ b> C is provided with a substantially cylindrical filling port portion 20 used for charging the cold storage agent.

  The convex part 13 has a truncated cone shape, and the shape in plan view (planar shape), that is, the shape of the upper wall 13a forming the upper surface of the convex part 13 is circular as shown in FIGS. And the peripheral wall 13b which forms the inclined surface of the convex part 13 has the inclination closed toward the container outer side, as shown in FIG.1 and FIG.5. The shape of the upper wall 13a is not limited to a circle, and can be various shapes such as an ellipse, a rectangle, a rectangle, and a polygon. However, considering the elongation characteristics of the resin during blow molding when manufacturing a cold storage container. From the viewpoint of obtaining a convex portion having a uniform thickness, the shape of the upper wall 13a is preferably a circle or a shape similar to a circle (for example, an ellipse).

  The height H of the convex portion 13 is preferably 3 to 50 mm, and more preferably 5 to 30 mm. Moreover, 3-30 mm is preferable and, as for the diameter R1 of the upper surface (upper wall 13a) of the convex part 13, 5-20 mm is still more preferable. If the diameter R1 of the upper surface of the convex portion 13 is less than 3 mm, the pressure applied to the object to be cooled via the convex portion 13 may increase and cause deformation or damage of the object to be cooled. When the diameter R1 exceeds 30 mm, There is a possibility that the capacity of the hollow portion 15 that is not filled with the cold storage agent becomes excessive and the filling amount of the cold storage agent in the container 10 is reduced, and the cold insulation of the cold object is insufficient.

In addition, as the number of the convex portions 13 on the convex portion forming surface (the outer surface of the container wall portion 11A) increases, the contact with the object to be cooled becomes more stable, and the possibility of causing deformation or damage of the object to be cooled decreases. As described above, the cold storage agent is not filled in the inside of the convex portion 13 (hollow portion 15), and therefore, as the convex portion 13 increases, the proportion of the cold storage agent non-filling portion in the cold storage agent container 10 increases. As a result, the regenerator filling amount as a whole is reduced. Therefore, the number of the convex portions 13 on the convex portion forming surface needs to be set in consideration of the balance between the contact stability with respect to the object to be cooled and the cold storage agent filling amount.
From such a point of view, all the projections formed on the projection forming surface with respect to the plane area of the projection forming surface (the area of the plane assuming that the projection forming surface is a flat surface). The ratio of the total area of the parts in plan view is preferably 0.5 to 60%, more preferably 1 to 20%.

  In the present embodiment, as shown in FIGS. 1 and 2, the plurality of convex portions 13 are arranged in a staggered manner. The pitch P of the plurality of convex portions 13 (the shortest distance between the centers of the adjacent convex portions 13 and 13 in plan view) is preferably 20 to 120 mm, more preferably, from the viewpoint of preventing access to the object to be cooled. Is 25 to 75 mm.

  As described above, the concave portion 14 is a portion in which a part of the container wall portion 11 </ b> B opposite to the convex portion 13 is depressed toward the convex portion 13, and one concave portion is formed with respect to one convex portion 13. 14 corresponds. That is, the same number of recesses 14 as the protrusions 13 formed on the container wall 11A are formed in the container wall 11B in the same arrangement form as the arrangement of the plurality of protrusions 13 in the container wall 11A. ing. The concave portion 14 has a truncated cone shape similar to that of the convex portion 13. The concave portion 14 forms a depressed bottom surface and has a circular planar shape, and is connected to the bottom wall 14 a and closed toward the bottom wall 14 a. It is comprised from the surrounding wall 14b which has an inclination.

The hollow portion 15 of each convex portion 13 is cut off from the space portion 12 which is a space filled with the cold storage agent by the wall portion (peripheral wall 14b) of the concave portion 14 corresponding to the convex portion 13. Therefore, even if the space part 12 is filled with the cold storage agent, the cold storage agent does not enter the hollow part 15.
In the present embodiment, as shown in FIG. 6, the entire inner surface of the wall portion (upper wall 13a, peripheral wall 13b) of the convex portion 13, the bottom wall 14a of the concave portion 14 and the peripheral wall (near the bottom wall 14a) are located. The peripheral wall 14b) is integrated. That is, the portion of the container wall portion 11A that forms the convex portion 13 is joined to the bottom wall 14a of the concave portion 14 and the portion that forms the peripheral wall of the container wall portion 11B, and the convex portion 13 and the concave portion 14 are integrated. ing. With such a configuration of the convex portion 13 and the concave portion 14 in the present embodiment, the strength of the cold storage agent container 10 can be improved, and sufficient resistance to repeated stress and external impact during freezing of the cold storage agent can be imparted. Furthermore, the effect of suppressing deformation of the cool storage agent container 10 due to the expansion of the cool storage agent during freezing can also be imparted.

The diameter R2 of the recess 14 on the outer surface of the container wall 11B (diameter at the opening of the recess) R2 is larger than the diameter R1 of the upper wall 13a of the protrusion 13, preferably 5 to 50 mm, more preferably 10 to 30 mm. .
The diameter of the bottom wall 14a of the recess 14 and the depth of the recess 14 are the size of the projection 13 and the thickness of the regenerator container 10 so that the hollow portion 15 and the space 12 of the projection 13 are blocked. It adjusts suitably according to. In the present embodiment, the diameter of the bottom wall 14 a is substantially the same as the diameter of the inner surface of the upper wall 13 a of the convex portion 13, and the depth of the concave portion 14 is that of the regenerator container 10 including the height of the convex portion 13. It is substantially the same as the thickness (thickness in the protruding direction of the convex portion 13).
Further, in the form in which the convex portion 13 and the concave portion 14 are integrated as in this embodiment, the wall portion formed by integrating the upper wall 13a of the convex portion 13 and the bottom wall 14a of the concave portion 14 is integrated. The thickness is preferably 0.4 to 2.0 mm, more preferably 0.5 to 1.0 mm, and the wall portion formed by integrating the peripheral wall 13b of the convex portion 13 and the peripheral wall 14b of the concave portion 14 is formed. The thickness is preferably 0.4 to 2.0 mm, more preferably 0.7 to 1.5 mm.

  The regenerator container 10 according to the present embodiment will be further described. The filling port portion 20 is formed in a recessed portion at the central portion in the longitudinal direction of the container peripheral wall 11C. A filling opening 21 is formed at an end of the filling port 20 on the outer side of the container, and the regenerator is filled into the container (space 12) from the filling opening 21. The filling opening 21 is sealed with a lid 22.

  A pair of plate-like reinforcing plate portions 30, 30 parallel to the container wall portions 11 </ b> A, 11 </ b> B are formed on both sides of the filling port portion 20. Each of the pair of reinforcing plate portions 30, 30 is bridged between the side surface of the filling port portion 20 and the recessed portion of the container peripheral wall 11 </ b> C, and thereby the strength of the filling port portion 20 is reinforced.

Various known materials can be used as the material for forming the regenerator container 10, and examples thereof include thermoplastic resins such as high-density polyethylene (HDPE), low-density polyethylene (LDPE), and polyester. Or a mixture of two or more. Among these, HDPE is particularly preferable in that it has a low embrittlement temperature, high water resistance, and moderate bending strength.
The wall thickness of the regenerator container 10 is preferably in the range of 0.4 to 2 mm from the viewpoint of the balance between the cold retention effect of the object to be cooled and the container strength.

The cool storage agent container 10 having the above-described configuration can be manufactured by a known blow molding method such as a hot parison method or a cold parison method.
For example, a melted thermoplastic resin (parison) that has been heated and softened is divided in two and sandwiched between a pair of laminated molds, and after closing the top and bottom of the parison, air is blown into the parison from the air blowing port of the die, The parison is inflated and pressed against the inner surface of the mold. Concave portions and convex portions corresponding to the convex portions 13 and the concave portions 14 are formed on the inner surface of the matching mold. The parison pressed against the mold is cooled and solidified as it is. After the parison is solidified, the pressed-in air is removed, the mold is opened, and the regenerator container 10 having a predetermined shape in which the convex portion 13 and the concave portion 14 are formed is taken out.

  As the regenerator filled in the regenerator container 10, those that can be filled in this kind of regenerator container can be used without particular limitation, for example, a regenerator with a melting temperature of 0 ° C. containing water as a main component, or The thing which mix | blended known thickeners, such as a food additive, with this cold storage agent is mentioned. In an environment where there is a lot of intrusion heat, a regenerator with a melting temperature of −2 to −5 ° C. in which a cryogen is blended can be preferably used.

The cool storage agent container 10 of this embodiment can be used similarly to this kind of cool storage agent container. That is, after introducing the cool storage agent into the container through the filling port portion 20 and filling the space portion 12, the cool storage agent container 10 is stored in a freezer and the cool storage agent is frozen before use.
According to the cool storage agent container 10, a plurality of hollow convex portions 13 that are not filled with the cool storage agent are formed on the outer surface of the container wall portion 11 </ b> A. Thus, it is possible to maintain the appropriate refrigeration state while preventing the occurrence of freezing failure of the object to be cooled. Freezing damage is more likely to occur as the heat capacity of the portion that comes into contact with the object to be cooled increases, and thermoplastic resins such as polyethylene resin, which is a material for forming the convex portion 13, generally have low heat conduction and are not filled with a regenerator. Even if the hollow portion 15 of the convex portion 13 is cooled in the freezer, it has a heat capacity corresponding to the resin amount of the portion, so that the heat capacity is smaller than that of the portion filled with the cold storage agent, and refrigeration is unlikely to occur. Therefore, the regenerator container 10 can be suitably used for cold storage of a cold object (food such as leafy vegetables and tofu, emulsified cosmetics, etc.) whose commercial value is impaired when frozen.
Moreover, since the cool storage agent container 10 is a fixed container comprised including a pair of container wall parts 11A and 11B which oppose each other, the cool storage agent can be efficiently frozen by using the cool storage agent freezing container. Can do.
In addition, by setting the dimensions, number, arrangement pattern, and the like of the protrusions 13 and the recesses 14 within the above-described ranges, the pressure applied to the object to be cooled that comes into contact with the protrusions 13 is dispersed, and deformation or damage of the object to be cooled is prevented. It can be effectively prevented.
Further, since the entire inner surface of the wall portion of the convex portion 13 and the bottom wall 14a of the concave portion 14 and the peripheral wall thereof are integrated, the strength of the container is improved, and repeated stress and external impact during freezing of the cold storage agent are increased. Can be obtained.
The cool storage agent container 10 has the above-described excellent performance, has a simple structure, can be easily manufactured by a known blow molding method, and is excellent in productivity.

As mentioned above, although this invention was demonstrated based on the preferable embodiment, this invention is not restrict | limited to the said embodiment.
For example, in the said embodiment, although the convex part 13 was formed only in the container wall part 11A which is one of a pair of container wall parts 11A and 11B, the convex part 13 is formed in both container wall parts 11A and 11B. May be.
Moreover, in the said embodiment, although the whole surface of the wall part inner surface of the convex part 13, the bottom wall of the recessed part 14, and its surrounding wall were integrated, the point is the hollow part 15 of the convex part 13 by the wall part of the recessed part 14. As long as the space portion 12 is cut off, the convex portion 13 and the concave portion 14 do not have to be integrated as in the above-described embodiment.
Further, the shape, number, and arrangement pattern of the convex portions 13 are not limited to the above-described embodiment, and can be arbitrarily set. In the embodiment, the upper wall 13a (upper surface) of the convex portion 13 is a plane parallel to the plane direction of the flat container wall portion 11A, but may be a curved surface.
Further, the overall shape of the regenerator container 10 is not limited to the rectangular parallelepiped shape as in the above-described embodiment, but is a cylindrical shape, an elliptical cylindrical shape, a cylindrical shape that is a polygon in a plan view, or a saddle shape (a pair of opposing ones). One of the wall portions may have a flat plate shape, and the other may have a curved surface shape convex outward.

  EXAMPLES Hereinafter, although this invention is demonstrated in detail based on an Example, this invention does not receive any limitation by description of an Example.

[Example 1]
A cold storage container 10 as shown in FIGS. 1 to 6 was produced by blow molding using hollow grade HDPE (melt flow rate 0.35 g / 10 min, density 0.953 g / cm ³ ). It was. The outer dimensions of the regenerator container 10 of Example 1 are 230 mm long, 140 mm wide, the thickness excluding the convex portion (maximum thickness) 22 mm, the height of the convex portion (H) 8 mm, and the planar shape of the convex portion. Was a circle with a diameter (R1) of 16 mm.

[Example 2]
In Example 1, the regenerator container 10 was manufactured in the same manner as in Example 1 except that the height (H) of the convex portion was 15 mm and the planar shape of the convex portion was a circle having a diameter (R1) of 15 mm. Example 2 was adopted.

Example 3
In Example 1, the regenerator container 10 was produced in the same manner as in Example 1 except that the height (H) of the convex portion was 2 mm and the planar shape of the convex portion was a circle having a diameter (R1) of 20 mm. Example 3 was adopted.

[Comparative Example 1]
The same shape as in Example 1 except that the hollow surface HDPE (melt flow rate 0.35 g / 10 min, density 0.953 g / cm ³ ) was blow-molded and no concaves and convexes were formed on the outer surface. A cold storage agent container having dimensions was manufactured, and this was designated as Comparative Example 1. The outer dimensions of the cool storage agent container of Comparative Example 1 were 230 mm in length, 140 mm in width, and 22 mm in thickness (maximum thickness).

[Cooling test for cold objects]
Inside the regenerator container of Examples and Comparative Examples (space part 12), a gel having a melting temperature of 0 ° C. as a regenerator (specific heat at freezing 2.1 J / g · K, melting latent heat 330 J / g, moisture 98 mass%) , Gelling agent: sodium polyacrylate having an average molecular weight of 40,000) was filled to 86% by volume of the container volume. Thus, the cool storage agent container filled with the cool storage agent was left in a freezer whose internal temperature was set to −25 ° C. for 12 hours to completely freeze the cool storage agent. And after taking out the cool storage agent container in which the cool storage agent was completely frozen from the freezer, immediately, a cold storage box made of Styrofoam (inner dimensions are 300 mm in length, 240 mm in width, 210 mm in height, average wall thickness of 18 mm, content of about 15l) so that the long side surface of the regenerator container faces the bottom surface (in the case of a container having a convex portion, the concave portion forming surface facing the convex portion forming surface is In addition, on the substantially central part of the cool storage agent container, a cold object (5 g of water put in a screw glass bottle with a capacity of 30 ml) cooled in advance at 10 ° C. The cool storage agent container and the glass bottle were placed so as to be in contact with each other (the container in which the convex part was formed was in contact with the convex part forming part), and the cold box was sealed. The outside temperature of this cold box was 30 ° C. While measuring the temperature change of the object to be cooled over time, the state of the object to be cooled was visually observed. These results are shown in Table 1 below and FIG.

FIG. 7 shows a change in the temperature of water immediately after the water to be cooled is in contact with the cold storage agent containers of the example and the comparative example through the glass bottle.
In Example 1, it takes about 1.5 hours for the regenerator to cool to about −25 ° C. in the freezer and to reach 0 ° C. which is the melting temperature in the cold box, and during this time sensible heat As the heat is taken away from the surroundings, the temperature of the object to be cooled is rapidly lowered. In Example 1, after 15 minutes from the time when the cold object is in contact with the cool storage agent container, the cool object is cooled to 1.8 ° C., which is the minimum temperature, but thereafter the melting temperature of the cool storage agent (0 ° C.). ), The temperature of the object to be cooled rises and enters a stable cold state at about 15 ° C. In Example 1, the regenerator melted after 8 hours. Example 2 also showed the same temperature change as Example 1.
In Example 3 in which the height of the convex portion was set to the lowest value of 2 mm, the cold object recorded a minimum temperature of −1.2 ° C. 17 minutes after the cold object contacted the cool storage agent container. The to-be-cooled object maintained a supercooled state and did not freeze.
On the other hand, in Comparative Example 1 having no convex part, the object to be cooled was supercooled to −6.4 ° C., frozen after about 10 minutes, and then kept frozen for 70 minutes.
From the above results, the cool storage agent container of the example is less likely to cause overcooling in the sensible heat region of the cool storage agent compared to the cool storage agent container of the comparative example, and is effective in preventing the freezing trouble of the cold object. Recognize.

FIG. 1 is a perspective view showing the surface (convex portion forming surface) side of one embodiment of the cool storage agent container of the present invention. FIG. 2 is a plan view showing the surface side of the cool storage agent container shown in FIG. 1. FIG. 3 is a perspective view showing a back surface (concave forming surface) side of the cool storage agent container shown in FIG. 1. FIG. 4 is a plan view showing the back side of the cool storage agent container shown in FIG. 1 with the lid removed. FIG. 5 is a side view showing one side surface of the cool storage agent container shown in FIG. 1. FIG. 6 is a cross-sectional view showing a cross section taken along line XX of FIG. It is a figure which shows the cold test result of an Example and a comparative example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Cold storage container 11A, 11B Flat container wall part 11C Flat container peripheral wall 12 Space part 13 Convex part 13a Upper wall (upper surface) of convex part
13b Protruding peripheral wall 14 Concave portion 14a Concave bottom wall (bottom surface)
14b Peripheral wall 15 of concave portion Hollow portion 20 of convex portion Filling port portion 21 Filling opening portion 22 Lid 30 Reinforcing plate portion

Claims (4)

In a cold storage agent container in which a cold storage agent is filled in a space portion sandwiched between a pair of opposed flat plate wall portions,
One of the pair of flat container wall portions is formed with a plurality of hollow protrusions in which a part of the flat container wall portion protrudes outward from the container. On the other hand, a concave portion is formed in which a portion facing the convex portion is depressed toward the convex portion,
A cold storage agent container configured such that the hollow portion of the convex portion and the space portion are blocked by the wall portion of the concave portion, and the hollow portion is not filled with the cold storage agent.   The regenerator container according to claim 1, wherein the entire inner surface of the wall of the convex part, the bottom wall of the concave part and the peripheral wall thereof are integrated.   The regenerator container according to claim 1 or 2, wherein a ratio of a total area in a plan view of all the convex portions formed on the formation surface to a planar area of the formation surface of the convex portions is 1 to 20%. .   The regenerator container according to any one of claims 1 to 3, wherein the convex portion has a truncated cone shape, and has a height of 3 to 50 mm and a top surface diameter of 3 to 30 mm.

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