JP2016145081A - Cold insulating container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cold insulating container capable of rapidly cooling an article to be packaged inside thereof and increasing the cold retaining capacity of the cooled article to be packaged.SOLUTION: A cold insulating container 10 comprises a container body 20 and a lid body 30 attachable to the container body 20, and a storage space S is formed inside the cold insulating container in a state where the container body 20 is covered with the lid body 30. A through hole 12 through which the outside of the cold insulating container 10 is communicated with the storage space S is formed on a side wall part 11 of the cold insulating container 10. In a side view when the side wall part 11 of the cold insulating container 10 is viewed from a horizontal direction H, the storage space S cannot be seen via the through hole 12 from the outside of the cold insulating container 10, and the through hole 12 is formed in such a manner that the storage space S can be seen via the through hole 12 from the outside of the cold insulating container 10 when the wall side part 11 of the cold insulating container 10 is seen from an obliquely upper direction R with respect to the horizontal direction H.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a cold container capable of suitably cooling an object to be packed such as squid and fresh fish.

  Traditionally, some fresh fish such as squid and sword fish that have been landed in Japan have been landed and then frozen, then transported in large quantities overseas by sea, etc. Has been.

  Containers commonly used in this distribution are corrugated cardboard containers with holes, but since shipping containers are stacked in multiple stages, corrugated cardboard alone does not have water-wetting strength, and a polyethylene bag is set in the container. It is used. In addition, after being packed in a container, it is frozen with the lid closed, and after freezing, it is transported overseas using a reefer container, etc., and is consumed at the consumption area while being transferred to a truck on the landing.

  For example, Patent Document 1 discloses a cold storage container including a container main body and a lid made of foamed synthetic resin, and has a through-hole having an orifice structure in a side wall portion of the cold storage container that is near the joint surface between the container main body and the lid. A cold storage container having at least two holes has been proposed.

  Further, Patent Document 2 proposes a cold storage container including a container main body and a lid made of foamed synthetic resin. The container body of the cold insulation container is formed with an outer tongue piece cut away leaving a part of the side wall portion, and an inner tongue piece cut away leaving the same part facing the same. A through hole is formed between the outer tongue piece and the inner tongue piece.

  As described above, since the cold insulating containers according to Patent Documents 1 and 2 are made of the foamed synthetic resin, the cold insulating property and the wettability can be improved as compared with the corrugated cardboard container.

Japanese Utility Model Publication No. 63-616 Japanese Utility Model Publication No. 63-615

  However, although both of the cold storage containers of Patent Document 1 and Patent Document 2 have through holes formed in the side walls, it takes a long time to freeze packed objects such as squid and fresh fish packed in the cold storage container. It was. In particular, in the case of the cold storage container of Patent Document 1, since the through-hole has an orifice structure, it takes a longer time to send the cold air into the cold storage container, so the inside must be cooled by vacuum precooling. It was. Furthermore, in the case of the cold storage container of Patent Document 2, in addition to the cooling time, an operation for hooking the outer tongue piece after the cold insulation to the inner tongue piece occurs, and the operation is complicated.

  Furthermore, in the cold storage container according to Patent Document 1 and Patent Document 2, warm air can easily enter from the outside through the through hole of the cold storage container, and the cold storage property of the frozen or cooled packaged object may be impaired.

  This invention is made | formed in view of such a point, and it is providing the cold storage container which can cool the inside to-be-packaged goods rapidly, and can improve the cool keeping property of the cooled to-be-packaged goods. .

  In order to solve the above-described problems, the present specification discloses a cold insulating container according to the first invention and the second invention described below. According to a first aspect of the present invention, there is provided a cold storage container comprising: a container body having an opening that opens upward; and a lid body that is attachable so as to cover the opening of the container body. A cold storage container in which an accommodation space for accommodating an object to be packed is formed in a state where the body is attached, and in a state where the lid is attached to the container body, A through hole is formed to communicate the outside of the cold storage container and the housing space, and the side wall portion of the cold storage container is viewed from the side in a horizontal direction through the through hole from the outside of the cold storage container. The housing space cannot be seen, and the housing space can be seen from the outside of the cold storage container through the through hole when the side wall portion of the cold storage container is viewed obliquely upward with respect to the horizontal direction. The through hole is formed. .

  According to the present invention, in the side view, the accommodation space is not visible from the outside of the cold insulation container through the through hole, and when viewed from an obliquely upward direction, the through hole is visible from the outside of the cold insulation container through the through hole. It is formed so that the accommodation space can be seen. As a result, cold air generally tends to flow downward from above the cold storage container. In the present invention, this cold air can easily flow along the through-holes (along the diagonally upward direction). The cold air can be easily taken into the accommodation space through the through hole. As a result, the object to be packed in the cold container can be quickly cooled.

  Furthermore, the warm air outside the cold storage container is generally easy to flow from the lower side to the upper side of the cold storage container. In the present invention, since the above-described through hole is formed in the cold storage container, such warm air is generated in the cold storage container. It is difficult to enter the accommodation space from the outside along the through hole (along the diagonally upward direction). On the other hand, the cold air of the pre-cooled package is generally easy to flow from the upper side to the lower side of the accommodation space. In the present invention, since the above-described through hole is formed in the cold storage container, such cold air is cooled. It is difficult to flow out of the container housing space along the through hole (along the diagonally upward direction). As a result, it is possible to improve the cold insulation property of the packed object accommodated in the accommodation space.

  A cold storage container according to a second aspect of the present invention includes a container main body in which an opening that opens upward is formed, and a lid that is attachable so as to cover the opening of the container main body. A cold storage container in which an accommodation space for accommodating an object to be packed is formed in a state where the body is attached, and in a state where the lid is attached to the container body, A through-hole that communicates between the outside of the cold storage container and the storage space is formed, the lid is attached to the container main body, and the outside of the cold storage container and the storage space are connected only by the through-hole. The through hole is formed so as to satisfy a range surrounded by X = 0.96, Y = 0.58, and Y = 2.875X-1.975 in a connected state. .

However, X is a cooling rate ratio with respect to a constant temperature bath, the cold storage container in the communication state is arranged in a constant temperature bath, and the constant temperature bath is cooled from 20 ° C. to −10 ° C. at a cooling rate Vco (−1.60) ° C. When the cooling rate from the time when the internal temperature in the accommodation space reaches 15 ° C. to the time when it reaches −5 ° C. is Vci ° / min under the cooling condition of cooling at / min, X = Vci / Vco Yes,
Y is the ratio of the heating rate to the constant temperature bath, the cold storage container in the communication state is placed in the constant temperature bath, and the constant temperature bath is heated from 20 ° C. to 50 ° C. at a heating rate Vho (3.61) ° C./min. Y = Vhi / Vho where the heating rate from the time when the internal temperature in the housing space reaches 25 ° C. to the time when it reaches 45 ° C. is Vhi ° C./min.

  According to the second aspect of the present invention, by forming a through hole that fills the range surrounded by X = 0.96, Y = 0.58, and Y = 2.875X-1.975 in the cold storage container, The to-be-packaged item can be quickly cooled, and the cold insulation property of the to-be-packaged item accommodated in the accommodation space can be improved. The significance of the parameters of the constant temperature chamber cooling rate ratio X and the constant temperature chamber heating rate ratio Y, and the range specified by these parameters will be described in detail in the following examples and the like.

  Here, the lower side wall surface forming the through hole of the cold insulation container according to the first and second inventions may be, for example, a convex or concave wall surface as it goes to the accommodation space side, and in the horizontal direction. The upper wall surface and the lower wall surface forming the through hole are not particularly limited as long as the through wall described above may be formed.

  However, as a more preferable aspect, the lower wall surface forming the through hole of the cold insulation container according to the first and second inventions is an inclined surface inclined downward with respect to the horizontal direction as it goes to the accommodation space side. Have According to this aspect, since the lower side wall surface forming the through hole has the above-described inclined surface, it is easy to take in cold air that goes downward from the outside of the cold insulation container during cooling.

  Moreover, as a more preferable aspect of the cold storage container according to the first and second inventions, the lower wall surface forming the through hole is formed on the side wall portion of the cold storage container than the upper wall surface forming the through hole. It has a projecting portion formed so as to project outward. According to this aspect, by providing the overhanging portion on the side wall portion, the lower side wall surface forming the through hole is formed so as to be visible when viewed from above. As a result, the cold air from the outside of the cold insulation container is likely to accumulate on the lower wall surface, and the cold air from the outside of the cold insulation container is easily taken into the accommodation space.

  Furthermore, the inner wall surface of the side wall part that forms the storage space for the cold storage container according to the first and second inventions may be a flat surface, a curved surface, etc., as long as it can take in cold air from the outside of the cold storage container through the through hole. It is not limited. As a more preferable aspect of the cold storage container according to the first and second inventions, the inner wall surface of the side wall part forming the accommodation space is continuous with the through hole from the through hole toward the bottom part of the container body. A plurality of groove portions are formed as described above. According to this aspect, since the cold air taken in from the through hole is guided along the plurality of grooves formed along the inner wall surface of the side wall portion, the cold air from the outside flows into the storage space of the cold storage container. Cheap.

  As a more preferable aspect of the groove portion, the groove portion has a tip portion between the through hole and the bottom portion of the container body. According to this aspect, the cold air taken in from the through hole and guided to the groove portion easily flows from the tip end portion of the groove portion formed between the through hole and the bottom portion of the container body to the inside of the accommodation space. Thereby, cold air can be sent into the accommodation space more efficiently.

  Furthermore, in the cold storage container according to the first and second inventions, it is preferable that the cold air from the above-described through holes flow efficiently into the cold storage container. As such an aspect, the container body of the cold storage container according to the first and second inventions has a lower through hole penetrating the cold storage container below the through hole. According to this aspect, since the cool air in the storage space easily flows downward from the lower through hole, the cooling efficiency by the cool air in the storage space can be increased.

  As a more preferable aspect of the lower through hole, the lower through hole has an edge through hole formed at a boundary portion between the side wall portion of the cold insulation container and the bottom portion of the cold insulation container. According to this aspect, even when the bottom surface of the cold storage container is installed on the ground, the cold air flows from the edge through hole taken into the accommodation space, so that the cooling efficiency of the cold air in the accommodation space can be improved. it can.

  As a more preferable aspect of the edge through hole, the edge through hole is not visible from the outside of the cold storage container through the edge through hole in the side view, and the bottom portion of the cold storage container is not visible. When viewed from the bottom, the housing space is formed so as not to be seen from the outside of the cold storage container through the edge through hole.

  According to this aspect, the edge through hole cannot be seen from the outside of the cold storage container through the edge through hole in the side view and the bottom view. It is difficult for warm air to enter the housing space from below the outside of the container.

  As a more preferable aspect of the lower through hole, the lower through hole has a plurality of bottom through holes formed in the bottom of the container body. According to this aspect, at the time of cooling, the cool air easily flows from the storage space of the cold storage container toward the bottom through-hole, so that the cooling efficiency of the storage space can be increased.

  As a more preferable aspect on the premise that the bottom through hole is provided, a plurality of support protrusions for supporting the cold storage container are formed on the outer bottom surface of the container body in which the bottom through hole is formed. According to this aspect, since the support protrusion supports the outer bottom surface of the cold storage container, the bottom through hole is not blocked. As a result, even when the cold insulation container is placed on a placement surface such as the ground and cooled, the cooling efficiency of the accommodation space by the bottom through hole can be increased.

  As a more preferred aspect, the through hole is formed between the lid body and the container body in a state where the lid body is attached to the container body. According to this aspect, since it can be provided between the through hole and the container body, that is, in the vicinity of the joint portion, it is easy to form the through hole in the cold storage container at the time of manufacture.

  According to the cold container according to the first and second inventions, it is possible to quickly cool the packed object inside and to improve the cold retaining property of the cooled packed object.

It is a typical disassembled perspective view of the cold storage container which concerns on 1st Embodiment (1st invention). It is the perspective view which looked at the container main body shown in FIG. 1 from upper direction. It is the perspective view which looked at the container main body shown in FIG. 1 from the downward direction. (A) is a top view of the container main body shown in FIG. 1, (b) is a bottom view of the container main body shown in FIG. (A) is the perspective view which looked at the cover body shown in FIG. 1 from upper direction, (b) is the perspective view which looked at the container main body shown in FIG. 1 from the downward direction. It is a typical perspective view of the cold storage container shown in FIG. It is arrow sectional drawing along the AA of FIG. It is arrow sectional drawing along the BB line of FIG. (A) is a perspective view which concerns on the modification of the container main body shown in FIG. 2, (b) is sectional drawing of the cold storage container which concerns on the modification in the position corresponded in FIG. The graph which showed the characteristic of the through-hole of the cold storage container which concerns on embodiment of 2nd invention. (A)-(e) is sectional drawing of the through-hole of the cold storage container which concerns on Examples 1, 2 and Comparative Examples 1-3. (A) is a temperature profile in a thermostat, Example 2-1, Comparative Example 3-1, and the temperature profile of the contents in the box of the cold storage container according to Comparative Example 4, and (b) is in the thermostat. These are the temperature profiles of the contents in the box of the cold storage container according to Example 2-1, Comparative Example 3-1, and Comparative Example 4. Cold Insulation According to Examples 1-1 to 1-3, Examples 2-1 to 2-3, Comparative Example 1-1, Comparative Example 2-1, Comparative Example 3-1, Comparative Example 3-2, and Comparative Example 4 It is the graph which showed the relationship between the freezing time of a container, and thawing | decompression time.

<First embodiment (first invention)>
Below, with reference to FIGS. 1-9, the cold storage container 10 which concerns on 1st Embodiment is demonstrated.
The cold storage container 10 according to the present embodiment accommodates an object to be packed which is a fresh fish such as squid, sword fish and the like, freezes the accommodated object to be packed in a freezer, and consumes the packed object It is a container to keep cold.

  As shown in FIG. 1, the cold container 10 includes a container body 20 and a lid 30. The lid 30 is attachable so as to cover the opening 20e of the container body 20, and in the state where the lid 30 is attached to the container body 20, the accommodation space for accommodating the above-described packaged items inside. S is formed (see, for example, FIGS. 7 and 8).

  The container body 20 and the lid body 30 are made of foamed resin, such as polystyrene, styrene-modified polyolefin resin, high impact polystyrene, styrene-ethylene copolymer, styrene-maleic anhydride copolymer, styrene-acrylonitrile copolymer. Various synthetic resin foams such as polystyrene resins such as coalescence, polyolefin resins such as polyethylene, polypropylene, and ethylene-vinyl acetate copolymer, and polyester resins such as polyethylene terephthalate can be used.

  Among these, a molded body by bead foaming of polystyrene or styrene-modified polyolefin resin is preferably used. The styrene-modified polyolefin resin is obtained by impregnating and polymerizing a polyolefin resin particle with a styrene monomer. Among the styrene-modified polyolefin resins, a styrene-modified polyethylene resin is preferable, for example, a styrene component The ratio is 40 to 90% by weight, preferably 50 to 85% by weight, more preferably 55 to 75% by weight.

  Further, the expansion ratio of the polystyrene foam is preferably 30 to 80 times. The foamed resin used in the cold insulation container 10 of the present embodiment has a higher foaming ratio than the conventional one. By increasing the expansion ratio in this way, the structure is more easily crushed and has an excellent buffering effect when a load is applied compared to the conventional expansion ratio.

  As shown in FIGS. 1 and 2, the container body 20 has a rectangular shape in a top view having a long side and a short side, and four side wall portions 21 rising from a rectangular bottom portion 24 having a long side and a short side. Thus, an opening 20e opened upward is formed. With the lid 30 attached to the container main body 20, the side wall 21 of the container main body 20 becomes the side wall 11 of the cold storage container 10, and the bottom 24 of the container main body 20 becomes the bottom 14 of the cold storage container 10.

  Further, the opening edge 20d forming the opening 20e of the container body 20 is fitted into a fitting groove 38 formed on the back surface 30b of the lid body 30 with the lid body 30 attached to the container body 20. A fitting protrusion 28 is formed (see FIG. 2, FIG. 5 (b), FIG. 8, etc.).

  A finger engagement recess 29a is formed in the opening edge 20d on the short side of the container body 20, and the operator inserts the lid 30 in a state of being attached to the container body 20 into the finger engagement recess 29a. The lid 30 can be easily removed from the container body 20 by lifting the lid 30.

  In addition, as shown in FIG. 3, a grip recess 29b is formed in the peripheral edge 20f on the short side of the outer bottom surface 20b of the container body 20, and an operator uses the grip recess 29b to hold the cold container 10. It can be easily transported.

  Furthermore, engagement concave portions 29 c are formed at the four corners of the outer bottom surface 20 b of the container body 20. When the cold storage containers 10 are stacked in the vertical direction so that the short side and the long side coincide with each other, the engagement concave portion 29c of the upper cold storage container 10 is formed on the upper surface 30a of the lid 30 of the lower cold storage container 10. The engaging projection 39 is configured to be engaged. In addition, the engagement convex part 39 formed along the long side direction of the upper surface 30a of the cover body 30 engages with the edge through-hole 25 of the upper cold storage container 10 at the time of stacking. Thus, the engagement convex part 39 of the upper surface 30a of the cover body 30 and the engagement concave part 29c formed in the bottom face 20b of the container main body 20 have the short side and the long side of the cold storage container 10 in the vertical direction. It acts as a positioning part when stacking.

  In addition to the engaging convex portion 39, a protrusion accommodating concave portion 37 is formed on the upper surface 30 a of the lid 30, which corresponds to the upper surface 10 a of the cold container 10. The protrusion housing recess 37 closes the bottom through-hole 26 of the upper cold storage container 10 with the upper surface 30a of the lid 30 in a state where the support protrusion 27 of the upper cold storage container 10 is stored when the cold storage containers 10 are stacked. It is formed as follows. In addition to the fitting groove 38 described above, a reinforcing rib 34 and a reinforcing edge 35 are formed on the back surface 30 b of the lid 30 in order to increase the rigidity of the lid 30.

  Further, two cutouts 22 are formed on each side wall 21 on the long side of the container body 20 so as to be separated from each other, and the cuts formed on the pair of side walls 21 and 21 facing each other on the long side. The notch parts 22 and 22 are formed in the position which opposes on both sides of the opening part 20e. On the other hand, as shown in FIGS. 5 (a) and 5 (b), in the state where the lid body 30 is attached to the container body 20 at the edge on the long side of the back surface 30 b of the lid body 30, A protruding edge portion 31 that protrudes downward is formed at a position that enters each notch portion 22.

  Thus, by providing the notch portion 22 of the opening edge 20d of the container body 20 and the protruding edge portion 31 of the back surface 30b of the lid body 30, the lid body 30 is attached to the container body 20 in a state where the lid body 30 is attached. A gap is formed between the notch 22 and the protruding edge 31. That is, as shown in FIGS. 6 and 7, a through-hole 12 that communicates the outside of the cold storage container 10 and the accommodation space S is formed in the side wall 11 of the cold storage container 10, and this is between the container body 20 and the lid body 30. Will be formed.

  Specifically, the cutout portion 22 of the container body 20 has an upper edge surface 22a facing upward, and the upper edge surface 22a has a horizontal direction H as it goes inward of the container body 20. An inclined surface 22b that is inclined downward is formed. On the other hand, the projecting edge portion 31 of the lid body 30 is formed with an inclined surface 31 c that is inclined downward with respect to the horizontal direction H as it goes inward of the lid body 30.

  In this manner, the inclined surface 22b of the container body 20 and the inclined surface 31c of the lid body 30 are spaced apart and arranged in parallel with the lid body 30 attached to the container body 20. The upper edge surface 22a of the container body 20 becomes the lower wall surface 12a that forms the through-hole 12, the inclined surface 22b of the container body 20 becomes the inclined surface 12b that constitutes a part of the lower wall surface 12a, and the inclined surface 12b As it moves to the accommodation space S side, it tilts downward with respect to the horizontal direction H. On the other hand, the inclined surface 31 c of the lid body 30 becomes the upper wall surface 12 c that forms the through hole 12.

  Here, as shown in FIG. 7, the through hole 12 formed in the cold insulation container 10 has the through hole 12 from the outside of the cold insulation container 10 in a side view when the side wall portion 11 of the cold insulation container 10 is viewed from the horizontal direction H. When the side wall 11 of the cold storage container 10 is viewed from the diagonally upward direction R with respect to the horizontal direction H, the storage space S is visible from the outside of the cold storage container 10 through the through hole 12. So that it is formed.

  Further, in the present embodiment, as shown in FIG. 2, the inner wall surface 11 a (21 a) of the side wall portion 11 (container body 20) that forms the accommodation space S of the cold container 10, and the bottom portion of the container body 20 from the through hole 12. A plurality of groove portions 21 b, 21 b,... Each groove portion 21 b is continuous to the through hole 12 on one side (base end side), and has a tip end portion 21 c between the through hole 12 and the bottom portion 24 of the container body 20 on the other side (tip end side). doing.

  In the present embodiment, as shown in FIG. 3, the container body 20 has four edge through holes 25 penetrating the cold storage container 10 at positions lower than the through holes 12 formed in the attached state, and A plurality of bottom through holes 26 are formed. In this specification, the edge through hole 25 and the bottom through hole 26 are collectively referred to as a lower through hole, and are a hole that communicates the outside of the cold storage container 10 with the accommodation space S.

  The edge through-hole 25 is a through-hole formed in a boundary portion 25a between the side wall 21 of the container main body 20 and the bottom 24 of the container main body 20 constituting the side wall 11 of the cold insulation container 10, and passes through each edge. The hole 25 is formed below the through hole 12 and the plurality of groove portions 21b described above.

  As shown in FIG. 7, the edge through-hole 25 cannot be seen from the outside of the cold storage container 10 through the edge through-hole 25 in the side view when the cold storage container 10 is viewed from the horizontal direction H. When the bottom 24 of the container 10 is viewed from the bottom in the vertical direction U, the housing space S is formed so as not to be seen from the outside of the cold storage container 10 through the edge through hole 25.

  In the present embodiment, at the boundary portion 25a between the side wall 21 of the container main body 20 and the bottom 24 of the container main body 20, the thickness of the side wall 21 along the horizontal direction H and the container main body 20 along the vertical direction. The edge through-hole 25 is obtained by forming a shape that penetrates the thickness of the bottom portion 24 of the bottom portion 24 and further forms a shape that penetrates a portion 25b facing the accommodation space of the side wall portion 21 from this shape.

  Thus, in the side view, the edge through hole 25 is formed by the end face of the bottom 14 (bottom 24) of the cold insulation container 10 (container main body 20) and the outer wall surface 10c (20c) of the cold insulation container 10 (container main body 20). The accommodation space S which is the inside of the cold storage container 10 cannot be seen through. On the other hand, in the bottom view, the cold insulation is performed via the edge through hole 25 by the end face of the side wall 11 (21) of the cold insulation container 10 (container main body 20) and the bottom face 10b (20b) of the cold insulation container 10 (container main body 20). The accommodation space S which is the inside of the container 10 cannot be seen.

  On the other hand, as shown in FIGS. 3 and 4A, 4B, a plurality of bottom through-holes 26 are formed so as to penetrate the bottom 24 of the container body 20, and the outside of the cold insulation container 10 and the accommodation space It is a hole communicating with S. The outer bottom surface 20b of the container body 20 is a rectangular surface having a long side and a short side, and the bottom through-hole 26 is formed at a position deviating from the pair of diagonal lines L and L of the outer bottom surface 20b ( (Refer FIG.4 (b)).

  Further, on the outer bottom surface 20b of the container body 20 in which the bottom through hole 26 is formed, a plurality of disk-shaped support protrusions 27, 27,. In the present embodiment, the plurality of support protrusions 27, 27,... Are composed of peripheral support protrusions 27a, 27a, and inner support protrusions 27b, 27b.

  The peripheral support protrusion 27 a is formed on the peripheral portion 20 f of the outer bottom surface 20 b of the container body 20. The inner support protrusion 27 b is formed on the inner side of the peripheral edge portion 20 f of the outer bottom surface 20 b of the container body 20. The inner support protrusion 27 b is formed at a position along the bisector C of the short side of the outer bottom surface 20 b of the container body 20.

  As described above, by providing the plurality of support protrusions 27, 27,..., The support protrusion 27 supports the outer bottom surface 10b of the cold storage container 10 during cooling, and therefore the bottom through-hole 26 formed in the bottom 14 of the cold storage container 10. Can be prevented from being blocked. As a result, the cooling efficiency of the accommodation space S by the bottom through-hole 26 can be improved even when the cold container 10 is placed and cooled on a placement surface such as the ground.

  Here, when the cold storage containers 10 are stacked in multiple stages in the up-down direction and the packaged items in the storage space S are frozen, the bottom through hole 26 may not be blocked so that the cool air from the storage space can easily flow. preferable. However, after freezing, for example, when transporting and temporarily storing the cold storage container 10 at room temperature at a consumption place overseas, cold air easily escapes from the bottom of the accommodation space, so the bottom through hole 26 is blocked. Is preferred.

  At this time, the cold storage containers other than the lowest stage stacked in the up-down direction can block the bottom through-hole 26 during stacking by devising the shape of the lower lid, the arrangement state at the time of stacking, and the like. However, since the lowermost cold storage container is in direct contact with the mounting surface such as the ground, it is difficult to close the bottom through hole 26. For this reason, the temperature of the storage space of the lowermost cold storage container tends to be higher than the temperature of the storage space of other cold storage containers. As a result, when the cold storage containers are stacked in multiple stages in the vertical direction, the temperature in the storage space of the cold storage containers may vary, and the quality of the items to be packed in the cold storage containers may vary.

  Here, when the cold storage containers 10 are stacked in multiple stages in the vertical direction and the packaged items in the storage space S are frozen, the cold storage containers 10 are stacked in three stages and assumed to be stacked in six stages at the maximum. Is done. On the other hand, when the cold storage containers 10 are stacked in multiple stages in the vertical direction, and the cold storage containers 10 are transported and temporarily stored at room temperature, at least seven or more stages are stacked. Under the present circumstances, the average weight of the to-be-packaged object packed in the storage space of the cold storage container stacked is a weight equivalent to 80% of the volume of the storage space.

  In the present embodiment, in consideration of such points, the support protrusions 27 are formed as follows. Specifically, the cold storage container 10 in which the object to be packed having a weight corresponding to 80% of the volume of the storage space S is stored in the storage space S is placed on any one of the three to six stages in the vertical direction on the placement surface. When stacking and mounting at the selected number of stages (for example, 6 selected stages), the bottom through hole 26 is not blocked by the mounting surface, and the stacking is performed by the support protrusions 27 of the cooler container 10 at the lowest stage. A plurality of support protrusions 27 are formed so as to support the cooled container.

  On the other hand, the number of stages (for example, the number of stages exceeding the number of stages selected in the vertical direction on the placement surface is stored in the cold storage container 10 in which the object to be packed having a weight corresponding to 80% of the volume of the accommodation space S is accommodated in the accommodation space S. When the number of selected stages is 6 and 7 or more), the support protrusion 27 of the cooler container 10 at the lowest stage is compressed and deformed, so that the bottom through-hole 26 is formed on the placing surface. A plurality of support protrusions 27 are formed so as to be closed.

  In the present embodiment, the above-mentioned “number of stages selected from any one of 3 to 6 stages” is selected as an example of 6 stages, and a plurality of support protrusions 27 are formed. When 3, 4, or 5 stages are selected, the shape, size, material, and the like of the plurality of support protrusions may be selected so that the above-described effect is exhibited according to the selected number of stages.

  By forming the support protrusions 27 in this way, at the time of cooling (freezing), when the cold insulating containers 10 are stacked in the vertical direction with the selected number of stages of six (less than six), the lowermost cold insulating container 10 The support protrusions 27 support the outer bottom surface 10 b of the cold container 10. Thereby, it is possible to prevent the bottom through-hole 26 formed in the bottom 14 of the cold insulation container 10 from being blocked by the mounting surface, and the cooling efficiency of the accommodation space S can be increased by the bottom through-hole 26.

  On the other hand, when the cold storage container 10 is temporarily transported and stored at room temperature, the cold storage containers 10 are stacked in at least six stages (seven or more), so that the lowermost cold storage container 10 is stacked. The support protrusion 27 is crushed by compressive deformation, and the bottom through-hole 26 is closed by the mounting surface.

  The “volume of the accommodation space S” is the volume of the space that does not include the through hole 12, the edge through hole 25, and the bottom through hole 26. That is, the “volume of the accommodation space S” is the volume of the space that continuously connects the lid 30 and the inner surface of the container body 20, and the through hole 12, the edge through hole 25, and the bottom through hole 26 from the inside. This is the volume of the accommodation space that is closed by a virtual plane.

<State during cooling (freezing)>
Below, the state at the time of cooling (freezing) of the to-be-packaged goods using the cold storage container 10 is explained in full detail. First, a PE bag, for example, is set inside the container body 20 to accommodate an object to be packed. In this state, as shown in FIG. 8, the lid body 30 is attached to the container body 20 so that the fitting protrusions 28 of the container body 20 are fitted into the fitting grooves 38 on the back surface 30 b of the lid body 30. To do. As a result, the article to be packed is accommodated in the accommodation space S of the cold container 10.

  Next, the cold storage containers 10 are stacked in the vertical direction in the freezer compartment. At this time, the support protrusions 27 formed on the bottom 14 (24) of the upper cold storage container 10 (container body 20) are stacked so as not to be stored in the protrusion storage recesses 37 of the lid 30 of the lower cold storage container 10. To do. Specifically, when stacking the cold storage containers 10 in the vertical direction, the cold storage containers 10 positioned in the vertical direction are shifted in the horizontal direction or relatively rotated by 90 ° and stacked. Thereby, the bottom through-hole 26 formed in the bottom of the upper cold storage container 10 is not blocked by the upper surface 30 a of the lower lid 30.

  Cold air is sent into the storage space S of the cold storage containers 10 stacked in this manner, and the article to be packed stored in the storage space S is cooled (frozen). In the present embodiment, as shown in FIG. 7, the through-hole 12 cannot be seen from the outside of the cold storage container 10 through the through-hole 12 in the side view as seen from the horizontal direction H, and the diagonally upward direction R Is formed so that the accommodation space S can be seen through the through hole 12 from the outside of the cold insulation container 10 when viewed from above. As a result, the cool air from the outside to the bottom of the cold storage container 10 tends to flow along the through hole 12 (along the oblique upward direction R), and the cold air outside the cold storage container 10 is accommodated through the through hole 12 in the accommodation space S. Easy to capture. As a result, it is possible to quickly cool (freeze) the object to be packed in the cold insulation container 10.

  In particular, in this embodiment, the lower wall surface 12a that forms the through hole 12 has the inclined surface 12b that is inclined downward with respect to the horizontal direction H as it advances toward the accommodation space S. It is easy to take cold air that goes downward from the outside of the cold storage container 10 into the accommodation space S.

  Furthermore, since the cold air taken in from the through hole 12 is guided along the plurality of groove portions 21b formed along the inner wall surface 11a of the side wall portion 11, the cold air from the outside enters the accommodation space S of the cold storage container 10. Tends to wrap around (see FIG. 2). The cold air taken in from the through hole 12 and guided to the groove portion 21b is likely to flow inwardly from the distal end portion 21c of the groove portion 21b formed between the through hole 12 and the bottom portion 24 of the container body into the accommodation space S. Thereby, cold air can be sent into the accommodation space S more efficiently.

  The cool air once sent into the accommodation space S flows below the accommodation space S. Below the accommodation space S, an edge through-hole 25 and a bottom through-hole 26 penetrating the cold container 10 are formed below the through-hole 12. Thereby, since the cold air of the storage space S is likely to flow downward from the cold storage container 10, the cooling efficiency by the cold air in the storage space S can be increased.

  Further, since a plurality of support protrusions 27 that support the cold storage container 10 are formed on the outer bottom surface 20 b of the container body 20, the support protrusions 27 support the outer bottom surface 10 b of the lowermost cold storage container 10. Thereby, the bottom part through-hole 26 formed in the bottom part 14 of the cold insulator 10 is not blocked. As a result, the cooling efficiency of the accommodation space S by the bottom through-hole 26 can be improved even when the cold container 10 is placed and cooled on a placement surface such as the ground.

  In particular, by providing the peripheral support protrusion 27 a as the support protrusion 27, it is possible to stably support the load of the upper cold storage container 10 acting through the side wall portion 21 of the container body 20 of the lowermost cold storage container 10. . Thereby, the space through which cold air flows from the bottom through hole 26 of the lowermost cold insulating container 10 can be stably secured.

  Furthermore, the weight of the object to be packed can be supported by the inner support protrusion 27b through the cold insulation container 10, and the bending of the bottom 24 of the container body 20 can be suppressed. As a result, it is possible to more reliably avoid the bottom through-hole 26 from being blocked by the mounting surface G due to the bending of the bottom 24 of the container body 20.

  In particular, since the position along the bisector C of the short side of the outer bottom surface 20b of the rectangular shape (the container body 20) having the long side and the short side is most easily bent due to the weight of the packaged object, it is at this position. By forming the inner support protrusion 27b, it is possible to more reliably suppress such bending.

  Further, since the bottom through-hole 26 is formed at a position deviating from the pair of diagonal lines L, L of the outer bottom surface 20b, the strength reduction of the bottom 24 of the container body 20 due to the provision of the bottom through-hole 26 is suppressed. Can do.

<During transportation / storage>
In this way, the cold storage container 10 containing the cooled (frozen) packaged items is stacked in seven or more levels in the vertical direction so that the long side and the short side coincide with each other. In this case, the cold container 10 may be temporarily transported and stored at room temperature.

  At this time, the warm air outside the cold storage container 10 tends to flow upward from the lower side of the cold storage container 10. However, since the through hole 12 having the above-described shape is provided in the cold storage container 10, such warm air is generated by the cold storage container 10. It is difficult to enter the accommodation space S along the through-hole 12 (along the diagonally upward direction R) from the outside.

  On the other hand, the cold air of the packaged object that has been cooled (frozen) is likely to flow downward from above the accommodation space S. In the present embodiment, since the through hole 12 having the above-described shape is provided in the cold insulation container 10, Such cold air is unlikely to flow out of the storage space S of the cold storage container 10 to the outside along the through hole 12 (in the diagonally upward direction R). As a result, it is possible to improve the cold insulation property of the packaged items accommodated in the accommodation space S.

  Further, in the embodiment, the edge through-hole 25 cannot be seen from the outside of the cold storage container 10 through the edge through-hole 25 in the side view and the bottom view. Does not easily enter the storage space S, and it is difficult for cold air to escape from the storage space S.

  Further, when the cold storage containers 10 are stacked in at least seven steps, the support protrusions 27 on the bottom 14 of the upper cold storage container 10 are received in the protrusion storage recesses 37 on the upper surface 30a of the lower cover 30. Thereby, the bottom through-hole 26 of the bottom 14 of the cold insulating container 10 other than the lowermost stage is closed by the upper surface of the lid 30 of the lower cold insulating container 10.

  On the other hand, the support protrusion 27 of the lowermost cold storage container 10 is crushed by compressive deformation, and the bottom through-hole 26 is closed by the mounting surface. In this way, it is possible to prevent the cool air that tends to flow downward from flowing out of the accommodation space S through the bottom through hole 26 of the lowermost cold insulating container 10. As a result, the temperature rise of the storage space S of the lowermost cold storage container is suppressed, the temperature of the storage space S of each cold storage container is suppressed from variation, and the quality of the packaged items of each cold storage container 10 varies. Can be suppressed.

  Here, for example, as shown in a modified example of the container body in FIGS. 9A and 9B, the lower wall surface 12 a that forms the through hole 12 is cooler than the upper wall surface 12 c that forms the through hole 12. A protruding portion 13 may be further provided on the side wall portion 11 so as to protrude toward the outside of the container 10.

  By providing the overhanging portion 13 on the side wall portion 11, the lower side wall surface 12 a forming the through hole 12 is formed so as to be seen in a top view. As a result, the cold air from the outside of the cold insulation container 10A toward the lower side is easily accumulated on the lower wall surface 12a, and the cold air from the outside of the cold insulation container 10A is easily taken into the accommodation space S.

  In the present embodiment, the container body 20 is provided with the edge through hole 25, the bottom through hole 26, the support protrusion 27, and the like. However, these may be provided as necessary, and at least in the cold container 10. If the through hole 12 is formed, the object to be packed in the cold insulation container 10 can be quickly cooled, and the cold insulation property of the object to be packed accommodated in the accommodation space S of the cold insulation container 10 can be improved. it can.

<Second Embodiment (Second Invention)>
The cold insulation container according to the second embodiment includes the form of the through hole of the cold insulation container shown in FIGS. 1 to 9 described above, and in this embodiment, the through hole 12 of the cold insulation container 10 is specified by a parameter.

  In the cold insulation container according to the first embodiment (first invention), as shown in FIGS. 7 and 11B, the side wall 11 of the cold insulation container 10 is viewed from the side H when viewed from the horizontal direction H. The accommodation space S was not visible from the outside through the through hole 12. However, in the present embodiment, on the assumption that the following parameter conditions are satisfied, for example, as shown in FIG. 11A described later, a side view of the side wall portion 11 of the cold insulating container 10 viewed from the horizontal direction H is shown. 3 includes the shape of the through hole 12 so that the accommodation space S can be seen from the outside of the cold storage container 10 through the through hole 12.

  As in the first embodiment, in the second embodiment, for example, the edge through hole 25, the bottom through hole 26, the support protrusion 27, and the like may be provided as necessary. Since it is the same as the cold storage container 10 which concerns on 1 invention, detailed description is abbreviate | omitted.

  Similarly to the cold insulation container according to the first invention, the cold insulation container 10 has the lid 30 attached to the container main body 20, and the side wall 11 of the cold insulation container 10 has the outside of the cold insulation container 20 and the storage space S. A through-hole 12 that communicates with each other is formed.

  As shown in FIG. 10, X = 0.96, Y = 0 in a communication state in which the lid body 30 is attached to the container body 20 and the outside of the cold storage container 10 communicates with the accommodation space S only through the through-hole 12. .58, Y = 2.875X-1.975, the through-hole 12 is formed so that the range enclosed may be satisfy | filled.

  Here, the communication state means that, for example, the edge through hole 25 and the bottom through hole 26 of the cold insulation container 10 shown in FIGS. 6 and 7 are not formed, and the outside of the cold insulation container 10 is accommodated by only the four through holes 12. A state in which the space S is communicated.

  X is the ratio of cooling rate to the constant temperature bath. The temperature chamber cooling rate ratio X is a value obtained by calculating Vci / Vco. Specifically, the cooling container 10 in the above-described communication state is placed in a thermostat, and the thermostat is cooled at a cooling rate Vco (−1.60) ° C./min from 20 ° C. to −10 ° C., The cooling rate from the time when the internal temperature in the storage space S of the cold storage container 10 reaches 15 ° C. to the time when it reaches −5 ° C. is Vci ° C./min. That is, the constant temperature bath cooling rate ratio X is a value obtained by calculating Vci / −1.60.

  The maximum value of the cooling rate ratio X for the constant temperature bath is 1, and when the cooling rate ratio X for the constant temperature bath is X = 1, the cooling rate inside the cold container 10 is the same as the cooling rate from the outside. The container 10 is easy to take in cold air and has extremely high cooling performance. However, on the other hand, it is easy for cold air to escape from the cold insulation container 10 and warm air can easily enter from the outside. From such a point of view, the constant temperature bath cooling rate ratio X ≦ 0.96 is set.

  Y is the ratio of the heating rate to the constant temperature bath. The temperature chamber heating speed ratio Y is a value obtained by calculating Vhi / Vho. Here, the cold storage container 10 in the above-described communication state is placed in a constant temperature bath, and the constant temperature storage vessel 10 is heated under the heating conditions in which the constant temperature bath is heated from 20 ° C. to 50 ° C. at a heating rate Vho (3.61) ° C./min. The heating rate from the time when the internal temperature in the inner storage space D reaches 25 ° C. to the time when it reaches 45 ° C. is Vhi ° C./min. In other words, the constant-temperature bath heating rate ratio Y is a value obtained by calculating Vhi / 3.61.

  Here, the maximum value of the constant temperature chamber heating rate ratio Y is 1, and when the constant temperature chamber heating rate ratio Y = 1, the internal heating rate of the cold container 10 is the same as the external heating rate. Yes, the object to be packed in the cold insulation container 10 is immediately heated by the heat from the outside, and the temperature rises. That is, in order to ensure the cold insulation characteristics, it is preferable that the ratio of heating rate Y to the constant temperature bath is small. However, if the through-hole 12 is formed so as to reduce the heating rate ratio Y for the temperature-controlled bath, it is difficult to take cold air into the accommodation space S through the through-hole 12 when the packaged object in the cold container 10 is cooled. Become. From such a viewpoint, the constant-temperature bath cooling rate ratio X ≧ 0.58 is set.

  Furthermore, the straight line of Y = 2.875X-1.875 shown with the chain line of FIG. 10 is a through-hole with respect to the cold storage container which does not have a through-hole (refer the comparative example 3 (FIG.11 (e)) mentioned later). It is the straight line which showed the characteristic when forming. As the number of through-holes or the opening area is increased, the temperature-controlled bath cooling rate ratio X = 1 and the temperature-controlled bath heating rate ratio Y = 1 are approached. It is known that 2.875 corresponding to the slope of this straight line depends on the number of through holes, the opening area, etc., and 1.875 corresponding to the intercept mainly depends on the shape of the through hole. I know.

  In this embodiment, from such a point of view, Y ≦ 2.875X−1 .. as a requirement of the shape of the through-hole that can cool the packaged item quickly and enhance the cold insulation of the cooled packaged item. It was set to satisfy 975.

  From the above, the conditions of X ≦ 0.96, X ≧ 0.58, and Y ≦ 2.875X-1.975 are satisfied, that is, X = 0.96, Y = 0.58, Y = 2. By forming the through-hole 12 in the cold insulation container 10 so as to satisfy the range surrounded by 875X-1.975, the packaged item in the cold insulation container 10 can be quickly cooled, and the cold insulation container 10 It is possible to improve the cold insulation property of the packaged items accommodated in the storage space S.

Examples according to the second invention will be described below.
[Example 1]
As the cold storage container according to Example 1, an EPS cold storage container having an expansion ratio of 60 times shown below was prepared. The cold storage container 10 has outer dimensions of 674 mm in length, 375 mm in width, and 155 mm in height, and four through holes 12 shown in FIG. The through-hole 12 is formed by attaching the lid 30 to the container body 20 as described above.

  The wall thickness of the side wall part 11 of the cold insulating container 10 is 22.5 mm, and the other wall thickness is substantially the same as the side wall part. The opening on the outside of the through hole 12 has a height of 15 mm and a width of 115 mm. In this embodiment, a part of the upper wall surface 12 c (a part of the outer side) and the lower wall surface 12 a that form the through hole 12 are placed horizontally. Tilt at 45 ° to the direction.

  Further, on the upper wall surface 12c, a horizontal surface 12g was formed on the accommodation space S side from the center line of the side wall portion 11 so that a gap of 2 mm in height can be seen when the cold storage container is viewed from the horizontal direction H. That is, in Example 1, when the side wall part 11 of the cold insulation container 10 is viewed from the side in the horizontal direction H, the accommodation space S has a height of 2 mm and a width of 115 mm from the outside of the cold insulation container 10 through the through hole 12. It can be seen at. That is, Example 1 is not an example of the cold insulation container according to the first invention.

  In Example 1, in order to specify the characteristics of the through hole 12, the edge through hole 25 and the bottom through hole 26 as in the cold insulation container 10 shown in FIGS. 6 and 7 are not formed, and the four through holes 12 are not formed. Only the outside of the cold storage container 10 and the accommodation space S are communicated.

[Example 2]
A cold storage container 10 similar to that in Example 1 was prepared. The difference from the first embodiment is that a through hole 12 having a shape as shown in FIG. 11B is formed. Specifically, the thickness of the side wall portion 11 of the cold storage container 10 is the same as the opening on the outside of the through hole 12, and the upper wall surface 12c and the lower wall surface 12a forming the through hole 12 are Tilt at 45 °.

  In the second embodiment, the storage space S cannot be seen from the outside of the cold storage container 10 through the through hole 12 in a side view when the side wall 11 of the cold storage container 10 is viewed from the horizontal direction H. That is, Example 2 corresponds to the example of the cold insulation container according to the first invention.

[Comparative Example 1]
A cold storage container 10 ′ similar to that in Example 1 was prepared. The difference from the first embodiment is that a through hole 12 ′ having a shape as shown in FIG. 11C is formed. Specifically, the wall thickness of the side wall portion 11 ′ of the cold insulation container 10 ′ is the same as the opening outside the through hole 12 ′, and the lower wall surface 12a that forms the through hole 12 ′ is attached to the cold insulation container 10 ′. From the outside to the half of the wall thickness of the side wall portion 11 ′, it was inclined at 45 ° with respect to the horizontal direction.

  Further, in Comparative Example 1, as in Example 1, in the side view of the side wall portion 11 ′ of the cold insulation container 10 ′ viewed from the horizontal direction H, the accommodation space is formed from the outside of the cold insulation container 10 ′ through the through hole 12 ′. S ′ is visible within a range of 2 mm in height and 115 mm in width.

  In addition, since FIG.11 (c)-(e) has shown the through-hole of the cold storage container which concerns on Comparative Examples 1-3, and since it is not included in this invention, in the site | part of Fig.11 (a), (b) “′” Is added to the end of the corresponding code.

[Comparative Example 2]
A cold storage container 10 ′ similar to that in Example 1 was prepared. The difference from the first embodiment is that a through hole 12 ′ having a shape as shown in FIG. 11D is formed. Specifically, in Comparative Example 2, the thickness of the side wall 11 ′ of the cold storage container 10 ′ is the same as the opening outside the through hole 12 ′, and the through hole 12 ′ is formed along the horizontal direction H. did. Therefore, in Comparative Example 2, in the side view of the side wall portion 11 ′ of the cold insulation container 10 ′ viewed from the horizontal direction H, the accommodation space S has a height of 15 mm through the through hole 12 ′ from the outside of the cold insulation container 10 ′. It can be seen in the range of width 115mm.

[Comparative Example 3]
A cold storage container 10 ′ similar to that in Example 1 was prepared. The difference from the first embodiment is that no through-hole is formed as shown in FIG.

<Measurement of temperature chamber cooling rate ratio X and temperature chamber heating rate ratio Y>
With respect to the cold insulation containers according to Examples 1 and 2 and Comparative Examples 1 to 3, the constant temperature bath cooling rate ratio X and the constant temperature bath heating rate ratio Y were measured by the following procedure. In this measurement, an object to be packed is not stored in the cold container, and is in the communication state described above.

First, a thermometer (RSW-30S manufactured by ESPECMIC) was attached to the following four points of the cold storage container, and the temperature transition was recorded.
(1) Intersection of the diagonal line inside the lid (just the center)
(2) Of the inner wall surface of the side wall portion on the long side of the container body, a position 50 mm vertically below the inner top surface at a position equally divided in the horizontal direction. (3) The inner wall surface of the side wall portion on the long side of the container body Among them, a position 10 mm vertically above the inner bottom surface at a position equally divided into two in the horizontal direction.
(4) Intersection of the container body diagonal (just the center)
The temperature was measured every 5 seconds during the experiment, and the average temperature of these four points was taken as the internal temperature in the storage space of the cold container.

  A net shelf is installed at a height of about 50 mm from the bottom of the thermostatic chamber PR-4K (height of the thermostatic chamber 1,000 mm, width 1,000 mm, depth 800 mm) manufactured by ESPEC, The cold insulation container was installed on the net shelf so that the intersection of the diagonal line and the intersection of the diagonal line of the bottom of the thermostatic chamber overlap at a horizontal position.

  A thermohygrometer (RSW-21S manufactured by ESPECMIC) was installed vertically at a position 500 mm above the intersection of the diagonal lines on the bottom of the thermostat, and the temperature inside the thermostat was measured every 5 seconds.

  The thermostat PR-4K provided with a thermometer / temperature / humidity meter and a cold storage container was sealed, the thermostat temperature was set to 20 ° C., and left for 1 hour. During this time, the temperature inside the container and the temperature inside the thermostatic chamber reach about 20 ° C. and reach an equilibrium state.

  Thereafter, the set temperature was changed to −10 ° C., and the temperature transition for 1.5 hours was measured. The temperature in the thermostatic chamber reached −10 ° C. in about 19 minutes, and the cooling rate Vco was −1.60 ° C./min. Moreover, the temperature in the cold storage container reached an equilibrium at −10 ° C. in any shape in 1.5 hours.

  The setting of the thermostat was again returned to 20 ° C. and left for 1 hour. During this time, the temperature inside the container and the temperature inside the thermostatic chamber reach about 20 ° C. and reach an equilibrium state.

  Thereafter, the set temperature of the thermostatic chamber was changed to 50 ° C., and the temperature transition was measured for 1.5 hours. The temperature in the thermostatic chamber reached 50 ° C. in about 8 minutes, and the heating rate Vho was 3.61 ° C./min. Moreover, the temperature in the cold storage container reached an equilibrium at 50 ° C. in any shape in 1.5 hours. The thermostatic chamber PR-4K was installed indoors, and the indoor air temperature was 12 to 15 ° C.

  The following values were calculated for each cold storage container from the changes in the internal temperature of the obtained thermostatic chamber and cold storage container. The cooling rate Vci (° C./min) was calculated by dividing the temperature change (20 ° C.) by the elapsed time (min) from the time of reaching 15 ° C. to the time of reaching −5 ° C. The heating rate Vhi (° C./min) was calculated by dividing the temperature change (20 ° C.) by the elapsed time (min) from the time of reaching 25 ° C. to the time of reaching 45 ° C.

  In each of the sections of 20 ° C. to 15 ° C., −5 ° C. to −10 ° C., 20 ° C. to 25 ° C., 45 ° C. to 50 ° C., the difference between the constant temperature bath temperature and the temperature in the container becomes small and the temperature change is constant. is not. The section used for the calculation this time is generally such that the temperature change is constant and the speed calculation is easy, so this calculation is used.

  For each cold storage container, the temperature-cooled bath cooling rate ratio X and the temperature-controlled bath heating rate ratio were calculated from the calculated cooling rate Vci and heating rate Vhi. The temperature chamber cooling rate ratio X was calculated by dividing the cooling rate Vci in the cold container by the cooling rate Vco of the thermostatic chamber. The constant-temperature bath heating rate ratio Y was calculated by dividing the heating rate Vhi in the cold container by the heating rate Vho of the thermostat. Each of these values is an index that represents how easily the temperature in the cold container is affected by the outside air.

  FIG. 10 and Table 1 show the measurement results of the constant temperature chamber cooling rate ratio X and the constant temperature chamber heating rate ratio Y of the cold insulation containers according to Examples 1 and 2 and Comparative Examples 1 to 3. In Table 1, the shapes of the through holes of Examples 1 and 2 and Comparative Examples 1 to 3 are shown as shapes A to E. The shape E has no through hole.

  In the first and second embodiments, the shapes A and B of the through-hole 12 are set so that X = 0.96, Y = 0.58, and Y = 2.875X-1.975 as shown in FIG. In Comparative Examples 1 and 2, the shapes C and D of the through-holes 12 ′ are used, and in Comparative Example 3, the shape E is not provided with the through-holes.

  In order to confirm the effect of the through hole 12 shown in Examples 1 and 2, the following evaluation test was performed. In this test, cold storage containers according to Examples 1-1 to 1-3 and Examples 2-1 to 2-3 having the through holes 12 of the shapes A and B of Example 1 and Example 2 were prepared. . Cold storage containers according to comparative examples 1-1 and 2-1 having through holes C and D having shapes C and D of comparative examples 1 and 2 were prepared. Moreover, the cold storage container of the comparative example 3-1 and the comparative example 3-2 which did not form the through-hole of the shape E of the comparative example 3 was prepared. The cold storage container has an outer dimension of 674 mm × 375 mm and a height of 155 mm, and the thickness of the side wall portion is 22.5 mm. The cold storage containers of Examples 1-1, 2-1, and 3-1 are the same as the cold storage containers of Examples 1, 2, and 3, and Comparative Examples 1-1, 2-1, and 3-1. This cold storage container is the same as the cold storage container of Comparative Examples 1, 2, and 3 described above.

  Moreover, in Example 1-2, Example 2-2, and Comparative Example 3-2, the edge through-hole shown in FIG. In Example 1-3 and Example 2-3, the edge through hole and the bottom through hole shown in FIG.

<Freezing evaluation: Measurement of freezing time>
As an evaluation method, freezing evaluation was performed by measuring the freezing time of the packaged items (contents) for each cold storage container. First, in each cold storage container, 6 kg of squid temperature-controlled at 15 ° C. is put as an object to be packed, a lid is attached to the container body, and the cold storage in a state where the lid is closed in a −25 ° C. constant temperature bath. The container was installed, and the temperature of the squid in the center of the container over time (the temperature of the contents in the box) was measured.

  The time when the measured temperature in the cold container reached −20 ° C. (the time when the squid completely freezes) was defined as the freezing time. The results are shown in Table 2 and FIG. FIG. 12A shows the temperature profile of the temperature profile in the thermostatic chamber, the contents in the box of the cold insulation container according to Example 2-1, Comparative Example 3-1, and Comparative Example 4. FIG.

<Thawing evaluation: measurement of thawing time>
As an evaluation method, thawing evaluation was performed by measuring the thawing time of the packaged items (contents) for each cold storage container. First, in each cold storage container, 6 kg of squid adjusted to −25 ° C. is put as an object to be packed, a lid is attached to the container body, and the cold storage in a state where the lid is closed in a constant temperature bath at 35 ° C. The container was installed, and the temperature of the squid in the center of the container over time (the temperature of the contents in the box) was measured. The time when the measured temperature in the cold container reached 2 ° C. (the time for the squid to thaw) was defined as the thawing time. The results are shown in Table 2 and FIG. FIG.12 (b) has shown the temperature profile of the temperature profile in a thermostat, the contents in the box of the cold storage container which concerns on Example 2-1, Comparative example 3-1, and Comparative example 4. FIG.

  FIG. 13 shows Examples 1-1 to 1-3, Examples 2-1 to 2-3, Comparative Example 1-1, Comparative Example 2-1, Comparative Example 3-1, Comparative Example 3-2. 10 is a graph showing the relationship between the freezing time and the thawing time of the cold container according to Comparative Example 4.

  As is clear from the results of Table 2, FIG. 12 (a), and FIG. 13, as in Examples 1-1 to 1-3, a cold storage container having a through-hole of shape A, and Example 2- As shown in 1-2-3, the cold storage container having the through-hole of the shape B is compared with the cold storage containers of Comparative Example 1-1, Comparative Example 2-1, Comparative Example 3-1, and Comparative Example 3-2. Freezing time is short.

  On the other hand, as is clear from the results of Table 2, FIG. 12 (b), and FIG. 13, as shown in Examples 1-1 to 1-3, a cold storage container having a through-hole of shape A, and Examples As shown in 2-1 to 2-3, the cold insulation container having the shape B through-hole has a longer thawing time than the cold insulation containers of Comparative Example 1-1, Comparative Example 2-1, and Comparative Example 4.

  From these results, as in Examples 1-1 to 1-3 and Examples 2-1 to 2-3, there was a relationship between the above-described constant-temperature bath cooling rate ratio X and the constant-temperature bath heating rate ratio Y. It was confirmed that the cold insulation container had good cooling performance and cold insulation performance, and Comparative Examples 2 and 3 in which some or all of the through holes were horizontal had inferior cold insulation performance.

  Further, as shown in FIG. 13, the cold insulation container of Example 1-2 provided with the edge through hole, the cold insulation container of Example 1-3 provided with the edge through hole and the bottom through hole are as shown in Example 1- The freezing time was shorter than that of No. 1 cold container. Similarly, the cold insulation container of Example 2-2 provided with the edge through hole and the cold insulation container of Example 2-3 provided with the edge through hole and the bottom through hole are compared with the cold insulation container of Example 2-1. The freezing time was shortened. Thereby, it is thought that the cooling rate of a cold storage container improves by providing an edge part through-hole and a bottom part through-hole in a cold storage container.

In general, the density of air decreases as the temperature rises (−10 ° C .: 1.34 kg / m ³ , 20 ° C .: 1.21 kg / m ³ , 50 ° C .: 1.09 kg / m ³ ). Therefore, high temperature air tends to rise. In addition, the upward flow causes spontaneous air convection and heat transfer by convection. In the cold insulation containers of Examples 1-1 to 1-3 and Examples 2-1 to 2-3, the lower wall surface of the through hole is inclined, and the through hole is inclined upward 45 ° toward the outside of the cold insulation container. Therefore, the upward flow of hot air from the outside tends to be relatively difficult to flow in. On the other hand, the low temperature air on the inside generates a downward flow in the container, so that the outflow from the through hole is hardly generated. As a result, the cold storage containers of Examples 1-1 to 1-3 and Examples 2-1 to 2-3 are considered to have good cooling performance and cold storage performance.

  In this way, if the horizontal surface is not formed on the upper wall surface and the lower wall surface of the through hole and the inclined surface is formed, that is, if the through hole inclined downward from above is formed, such an effect is expected. I think it can be done.

  However, as in Comparative Examples 1-1 and 2-1, the cold storage container having the shapes C and D in which the horizontal through holes are formed has a small effect as described above, and the air in and out of the cold storage container increases and decreases in temperature. It is considered that the cold insulation performance is lowered by the inflow of air.

  As mentioned above, although several embodiment of this invention was explained in full detail, this invention is not limited to the said embodiment, In the range which does not deviate from the mind of this invention described in the claim, it is various. The design can be changed.

DESCRIPTION OF SYMBOLS 10,10A: Cold storage container, 10a: Upper surface of cold storage container, 11: Side wall part, 12: Through-hole, 12a: Lower side wall surface, 12b: Inclined surface, 12c: Upper wall surface, 13: Overhang part, 14: Bottom part, 20 , 20A: container body, 20a: inner bottom surface, 20b: outer bottom surface, 20c: outer surface, 20d: opening edge, 20e: opening portion, 21: side wall portion, 21a: inner wall surface, 21b: groove portion, 21c: tip portion, 22: Notch part, 22a: Upper edge surface, 22b: Inclined surface, 24: Bottom part, 25: Edge part through hole, 25a: Boundary part, 26: Bottom part through hole, 27: Support protrusion, 27a: Perimeter support protrusion, 27b: inner support protrusion, 28: fitting protrusion, 29a: finger engagement recess, 29b: gripping recess, 29c: engagement recess, 30: lid, 30a: upper surface of the lid, 30b: back surface of the lid, 31 : Protruding edge portion, 31c: lower edge surface, 34: reinforcement , 35: reinforcement edge, 37: protrusion housing recess, 39: engagement projection, C: bisecting line, H: horizontal direction, L: diagonal, S: housing space, R: diagonally upward, U: vertical direction

Claims (12)

A container body formed with an opening that opens upward; and a lid that can be attached to cover the opening of the container body, with the lid attached to the container body. Is a cold storage container in which an accommodation space for accommodating an object to be packed is formed,
In the state where the lid is attached to the container main body, a through hole is formed in the side wall of the cold storage container to communicate the outside of the cold storage container and the storage space.
In the side view of the side wall portion of the cold storage container as viewed from the horizontal direction, the housing space cannot be seen from the outside of the cold storage container through the through hole, and the side wall portion of the cold storage container is positioned with respect to the horizontal direction. The cold storage container, wherein the through hole is formed so that the accommodation space can be seen through the through hole from the outside of the cold storage container when viewed obliquely from above. A container body formed with an opening that opens upward; and a lid that can be attached to cover the opening of the container body, with the lid attached to the container body. Is a cold storage container in which an accommodation space for accommodating an object to be packed is formed,
In a state where the lid is attached to the container main body, a through-hole that communicates the outside of the cold storage container and the accommodation space is formed in the side wall portion of the cold storage container, and the lid is formed on the container main body. In a communication state in which the body is attached and the outside of the cold container and the accommodation space are communicated with each other only through the through hole, X = 0.96, Y = 0.58, Y = 2.875X-1.975 The cold storage container, wherein the through hole is formed so as to satisfy the enclosed range.
However, X is a cooling rate ratio with respect to a constant temperature bath, the cold storage container in the communication state is arranged in a constant temperature bath, and the constant temperature bath is cooled from 20 ° C. to −10 ° C. at a cooling rate Vco (−1.60) ° C. When the cooling rate from the time when the internal temperature in the accommodation space reaches 15 ° C. to the time when it reaches −5 ° C. is Vci ° / min under the cooling condition of cooling at / min, X = Vci / Vco Yes,
Y is the ratio of the heating rate to the constant temperature bath, the cold storage container in the communication state is arranged in the constant temperature bath, and the constant temperature bath is heated from 20 ° C. to 50 ° C. at a heating rate Vho (3.61) ° C./min. Y = Vhi / Vho where the heating rate from the time when the internal temperature in the housing space reaches 25 ° C. to the time when it reaches 45 ° C. is Vhi ° C./min.   The cold storage container according to claim 1 or 2, wherein a lower side wall surface forming the through hole has an inclined surface inclined downward with respect to the horizontal direction as it goes to the accommodation space side.   The side wall portion has a projecting portion formed so that a lower side wall surface forming the through hole projects outward from the upper wall surface forming the through hole. The cold storage container according to any one of claims 1 to 3.   A plurality of grooves are formed on an inner wall surface of the side wall portion forming the housing space so as to be continuous with the through hole from the through hole toward a bottom portion of the container body. Item 5. The cold storage container according to any one of Items 1 to 4.   The cold storage container according to claim 5, wherein the groove portion has a tip portion between the through hole and a bottom portion of the container main body.   The cold storage container according to any one of claims 1 to 6, wherein a lower through hole penetrating the cold storage container is formed in the container main body below the through hole. .   The cold storage container according to claim 7, wherein the lower through hole has an edge through hole formed at a boundary portion between the side wall portion of the cold storage container and the bottom portion of the cold storage container.   In the side view, the edge through hole cannot be seen through the edge through hole from the outside of the cold storage container, and the bottom view of the cold storage container viewed from the vertical direction in the bottom view, The cold storage container according to claim 8, wherein the storage space is formed so as not to be seen from the outside of the cold storage container through the edge through hole.   The cold storage container according to any one of claims 7 to 9, wherein the lower through hole has a plurality of bottom through holes formed in the bottom of the container main body.   The cold storage container according to claim 10, wherein a plurality of support protrusions for supporting the cold storage container are formed on an outer bottom surface of the container main body in which the bottom through hole is formed.   The said through-hole is formed between the said cover body and the said container main body in the state which adhered the said cover body to the said container main body, The Claim 1 characterized by the above-mentioned. The cold storage container as described.

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