JP2007024427A - Cooling storage agent container - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cooling storage agent container with improved strength, enduring repeated stress in freezing, and capable of even enduring external impact in regard to a cooling storage agent container having a recessed part for reinforcement. <P>SOLUTION: The cooling storage agent container 10 of a first embodiment is a flat, substantially rectangular shaped hollow container, and it has a plurality of recessed parts 2 for reinforcement formed by respectively recessing a plurality of portions facing a pair of flat container wall parts 11A, 11B, and joining inner faces of the recessed flat container wall parts. Outer faces of a container wall part in the recessed part 2 for reinforcement are formed from a recessed bottom face 21 and a recessed slanted face 22, a perpendicular cross section with respect to the pair of flat container wall parts 11A, 11B in a crossing part 23 of the recessed bottom face 21 and the recessed slanted face 22 is a circular arc shape, which, to be specific, is one part of a circle. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a cold storage agent container that is filled with a cold storage agent for maintaining a refrigerated state or a frozen state of food, medicine, etc., and particularly relates to a cold storage agent container having a reinforcing recess.

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. This type of regenerator container is used after the regenerator is filled and sealed inside, and then the regenerator is frozen. The cool storage agent container in which the cool storage agent is frozen is stored in a cool box or the like. The cold storage box or the like is used for storage and transportation of food, medicines, and the like because its internal temperature is kept at a low temperature for a certain period of time.
Further, when the cool storage agent is frozen, the cool storage agent container is easily deformed by the volume expansion of the cool storage agent. When the cool storage agent container is deformed, it may not be stored in a predetermined part such as a cold box, and it is desirable that the deformation of the cool storage agent container is small. Therefore, a recess for reinforcement is formed in the cool storage agent container to prevent the deformation. For example, in the cool storage agent container described in Patent Document 1, the reinforcing recesses are formed by recessing a plurality of opposing portions of the pair of flat container wall portions in the cool storage agent container, and the inner surface of the recessed container wall portion. It is formed by joining together.

JP 2004-69126 A

The cold storage agent container is easily frosted on its outer surface when the cold storage agent is frozen, and the surface of the cold storage agent is in a thawed state, that is, during or immediately after use of the cold storage agent container. Condensation easily occurs, so it is easy to slip and fall when handled by hand.
On the other hand, as a material for forming the regenerator container, for example, high-density polyethylene is used from the viewpoint of excellent low-temperature brittleness and excellent water resistance and chemical resistance. A cold storage agent container is normally produced by blow molding from resin materials, such as high-density polyethylene. In general, the thickness of a resin material such as high-density polyethylene is preferably about 3 mm or less from the viewpoints of moldability or economic efficiency, particularly cold-retaining efficiency. Therefore, as a technique for preventing deformation of the cool storage agent container due to the volume expansion of the cool storage agent, formation of a reinforcing recess has been adopted rather than an increase in resin wall thickness.

As shown in FIG. 9 (a), the conventional reinforcing recesses are formed by sinking the opposing portions of the pair of flat plate-like container wall portions 11A and 11B in the cool storage agent container, and the inner surfaces of the recessed container wall portions. Are formed by joining.
The above-described reinforcing recess is a portion that receives deformation due to bending of the container wall when subjected to external impact such as dropping of the cool storage agent container, and is repeatedly performed during volume expansion of the cool storage agent during freezing. It is also a part where stress is applied. More specifically, as shown in FIG. 9B, stress concentrates on the intersecting portion 23 ′ of the depressed bottom surface 21 and the depressed inclined surface 22 forming the reinforcing recess 2. As shown in FIG. 9B, corner portions are formed at the intersecting portion 23 ′ in the reinforcing recess 2. As shown in FIG. When the stress on the intersecting portion 23 ′ is repeated, the forming material of the intersecting portion 23 ′ eventually becomes fatigued, and as shown in FIG. 9B, cracks K and the like are formed from the corners of the intersecting portion 23 ′. As a result, a hole is partially opened in the reinforcing recess 2 and the cold storage agent leaks to the outside, and the cold storage agent container cannot be used.

  Accordingly, an object of the present invention is to provide a cold storage agent container having a reinforcing recess, which can withstand repeated stresses during freezing and withstand external impacts and has improved strength.

  As a result of intensive studies, the present inventors have found that the present invention can be achieved by forming a cross section of an intersection of the depressed bottom surface and the depressed inclined surface forming the reinforcing concave portion into an arc shape. .

  The present invention has been made on the basis of the above-described knowledge, in which one or a plurality of opposing portions of a pair of flat container walls are depressed, and the inner surfaces of the depressed flat container walls are joined together. In the regenerator container having one or a plurality of reinforcing recesses formed as described above, the outer surface of the plate-like container wall portion in the reinforcing recess is formed of a depressed bottom surface and a depressed inclined surface, and the depressed bottom surface The above object is achieved by providing a cold storage agent container in which a vertical cross section with respect to a pair of the flat container wall portions at an intersection with the depression inclined surface has an arc shape.

  According to the cold storage agent container having the reinforcing concave portion of the present invention, it can withstand repeated stresses during freezing and withstands external impacts, and the strength is improved.

  Hereinafter, a preferred embodiment of the cold storage agent container of the present invention will be described with reference to FIGS.

  As shown in FIGS. 1 and 2, the cool storage agent container 10 according to the first embodiment of the present invention is formed by sinking the four opposing portions of the pair of flat plate container wall portions 11 </ b> A and 11 </ b> B. It has four reinforcing recesses 2, 2... Formed by joining the inner surfaces of the flat container wall. As shown in FIG. 3, the outer surface of the container wall portion in the reinforcing recess 2 is formed of a depressed bottom surface 21 and a depressed inclined surface 22, and a pair of intersections 23 between the depressed bottom surface 21 and the depressed inclined surface 22. As shown in FIGS. 3 and 4, the vertical cross section with respect to the flat container wall portions 11 </ b> A and 11 </ b> B has an arc shape. In FIG. 1 and FIG. 2, only one container wall 11A is shown, but the reinforcing recess 2 is similarly formed in the other container wall 11B.

  The cold storage agent container 10 according to the present embodiment will be described in detail. A hollow container having a flat rectangular parallelepiped shape as a whole, and the four container peripheral walls 12, 12... Are extended portions of a pair of flat plate container wall portions 11A and 11B. Are bent and joined. A filling port portion 3 is provided in a part of the container peripheral wall 12, and the filling port portion 3 is formed by joining a part of inner surfaces of the container peripheral wall 12 to each other.

The reinforcing recess 2 in the cool storage agent container 10 of the present embodiment will be further described. As shown in FIGS. 1 and 3, each of the four reinforcing recesses 2, 2,... The truncated cone shape has a shape joined at the top surfaces. Since the four reinforcing recesses have the same configuration, only one reinforcing recess 2 will be described below.
The top surface of the truncated cone shape is formed from a depressed bottom surface 21, and the side surface of the truncated cone shape is formed from a depressed inclined surface 22.
In order to prevent deformation of the regenerator container 10, the depressed inclined surface 22 of the reinforcing recess 2 has an inclination that opens outward as shown in FIG. 3.

An intersection 23 between the depressed bottom surface 21 and the depressed inclined surface 22 is formed along the outer periphery of the depressed bottom surface 21. In the present embodiment, the arc shape at the intersection 23 is a part of a circle as shown in FIG. In the intersecting portion 23, the depressed bottom surface 21 and the depressed inclined surface 22 are connected by such a continuous curve, and the stress acting on the intersecting portion 23 is dispersed throughout the intersecting portion 23.
The radius of curvature of the arcuate shape at the intersecting portion 23 is preferably as large as possible from the viewpoint of dispersing the stress acting on the intersecting portion 23. On the other hand, the volume of the hollow portion of the regenerator container 10 is increased and the regenerator is filled. The smaller the capacity, the better. Therefore, from the balance of both, the radius of curvature of the arc shape is preferably 0.4 mm to 5 mm, and particularly preferably 0.6 mm to 2 mm. The regenerator container 10 of the present embodiment is usually produced by blow molding. In this case, the intersecting portion of the reinforcing concave portion of the mold used for blow molding may have an arc shape even if it is not chamfered, but its curvature radius is less than 0.4 mm.
Further, the length of the arcuate shape measured at the intersecting portion 23 along the arc is preferably 0.5 mm to 6 mm, and particularly preferably 0.7 mm to 3 mm, from the same viewpoint as described above. preferable.
As shown in FIG. 2, the four reinforcing recesses 2, 2... In the cool storage agent container 10 are formed on the entire container wall 11A having a substantially rectangular shape in a well-balanced manner.

The cool storage agent container 10 of this embodiment has a substantially rectangular parallelepiped shape, and the outer dimensions thereof are 150 mm to 400 mm in length, 70 mm to 300 mm in width, and 15 mm to 50 mm in thickness. Is preferred.
In the cool storage agent container 10 of the present embodiment, the shape of the depressed bottom surface 21 of the reinforcing recess 2 and the shape of the outer surface of the container wall are both circular. The larger the diameter of the recessed bottom surface 21 is, the larger the partial joining area of the pair of container wall portions 11A and 11B is, which is preferable from the viewpoint of preventing the deformation of the container when the stored agent is frozen. The smaller the diameter, the more the volume of the hollow portion of the cool storage agent container 10 increases, which is preferable from the viewpoint of increasing the capacity of the stored cool storage agent. Therefore, from the balance of both, the diameter of the depressed bottom surface 21 is preferably 4 mm to 30 mm, and particularly preferably 6 mm to 15 mm. The diameter of the reinforcing concave portion 2 on the outer surface of the container wall is preferably larger than the diameter of the depressed bottom surface 21 and is preferably 6 mm to 50 mm, and preferably 10 mm to 30 mm from the same viewpoint as described above. Is particularly preferred.
The depth of the reinforcing recess 2 is appropriately adjusted according to the thickness of the cold storage agent container 10.
Further, the thicknesses of the depressed bottom surfaces 21 of the two opposing reinforcing recesses 2 are equal to or less than twice the thickness of other portions (for example, the portions excluding the reinforcing recesses 2 in the container wall portions 11A and 11B). However, in consideration of uneven thickness and the like, it is preferably 1.5 times or less of the thickness of other portions, and particularly preferably compression molded to 1 time or less.

Various known materials can be used as a material for forming the regenerator container of the present embodiment, and synthetic resins such as polyolefins, polyamides, and polyesters are preferable. Particularly, the viewpoint of excellent low-temperature brittleness and excellent water resistance and chemical resistance. Therefore, polyolefin is preferable, and high-density polyethylene is preferable from the viewpoint of excellent moldability and strength.
As the regenerator used by filling the regenerator container of the present embodiment, various known materials can be used, but in particular, a viscous liquid (gel) using a food additive as a thickener is preferable, and if necessary. A colorant or a cryogen added to adjust the melting temperature can be used.

The regenerator container 10 according to the present embodiment will be further described. As shown in FIGS. 1 and 2, a substantially cylindrical filling port portion 3 is provided in a part of the container peripheral wall 12. A filling opening portion 31 that is an opening portion is formed in the filling port portion 3.
Specifically, as shown in FIGS. 2 and 5, the filling port portion 3 is formed in a recessed portion in the central portion in the longitudinal direction of the container peripheral wall 12. A filling opening 31 is formed at the front end of the filling port 3, and after the cold storage agent is filled inside the filling opening 31, the lid is closed and sealed by a known method so as not to come off. . The rear end portion of the filling port 3 is a portion on the container peripheral wall 12 side.

  As shown in FIGS. 1 and 2, a pair of plate-like reinforcing plate portions 13, 13 are formed on both side portions of the filling port portion 3 by joining the container inner surfaces of the extension portions of the container peripheral wall 12 to each other. . As shown in FIGS. 2 and 5, each of the pair of reinforcing plate portions 13, 13 is bridged between the side surface of the filling port portion 3 and the recessed portion of the container peripheral wall 12. It is reinforced. In the pair of reinforcing plate portions 13 and 13, the upper outer surface and the lower outer surface are substantially parallel to each other. 1, 2 and 5, only the upper side of each of the pair of reinforcing plate portions 13 and 13 is shown, but the lower side is also formed in the same manner.

As shown in FIG. 5, the peripheral edge portion of the filling opening portion 31 of the filling port portion 3 protrudes toward the outer peripheral direction, and the protruding portion forms a protruding portion 32.
In the cross section of the filling port portion 3 along the outer surface on the upper side of the reinforcing plate portion 13, the intersection 34 between the lower surface of the overhang portion 32 and the outer surface of the filling port portion 3 that is not the overhang portion 32 is a circle as shown in FIG. It has an arcuate shape. Specifically, the arcuate shape is a part of a circle. The lower surface of the overhanging portion 32 is a surface facing the container side along the central axis of the filling port portion 3.
Further, in the cross section in the vicinity of the filling port portion 3 along the outer surface on the upper side of the reinforcing plate portion 13, an intersection 35 between the outer surface that is not the overhanging portion 32 of the filling port portion 3 and the outer surface of the container peripheral wall 12 is also shown in FIG. Further, it has an arc shape, and specifically, the arc shape is a part of a circle.
The same applies to the filling port 3 along the lower outer surface of the reinforcing plate 13 and the cross section in the vicinity thereof.

As described above, the cross section along the upper and lower outer surfaces of the pair of reinforcing plate portions 13 and 13 on the outer surface of a part in the vicinity of the filling port portion 3 has an arcuate shape. When stress is applied, it is designed to disperse.
Further, the radius of curvature of the arc shape that is a part of the circle and the length along the arc are the same as those of the reinforcing recess 2.

The cool storage agent container 10 having the reinforcing concave portion 2 having the above-described shape can be usually produced by blow molding as follows.
The cool storage agent container 10 of the present embodiment uses, for example, a resin excellent in low-temperature brittleness, sandwiches a heated and softened parison between a pair of mating molds, closes the top and bottom of the parison, and then blows air into the die Air is blown through the mouth to inflate the parison and press it against the inner surface of the mold. The stretched parison is solidified as it is to become a hollow container, and the mold is opened to obtain the regenerator container 10 of the present embodiment. Here, the pair of mating dies is provided with a truncated cone-shaped portion in each of a plurality of opposing portions. The reinforcing concave portion 2 is formed by the truncated cone portion, and a depressed bottom surface is formed at the top surface portion of the truncated cone shape. In the frustoconical portion of each of the pair of matching molds, the outer peripheral portion of the circular portion that is the top surface is chamfered with a predetermined radius of curvature. By the chamfering, an arc shape is formed at the intersecting portion 23 of the depressed bottom surface 2 in the cool storage agent container 10.

  When the cool storage agent container 10 of this embodiment is produced by blow molding as described above, the container inner surface portion 25 (see FIG. 4) of the intersecting portion 23 has a shape that is left to the resin flow. Since the resin is pressed and solidified by the air, the shape of the portion 25 may follow the shape of the mold as a whole, but the shape is not exactly the same as the mold.

According to the regenerator container 10 of the present embodiment described above, since the arcuate crossing portion 23 is provided in the reinforcing recess 2, it can withstand repeated stress during freezing and withstands external impact, and is strong. Has been improved.
Further, since the intersecting portion 23 of the reinforcing concave portion 2 is rounded, dust, mud and the like are easily removed when the cool storage agent container 10 is washed, and the usability is excellent.
In addition, since the cross section along the upper and lower outer surfaces of each of the pair of reinforcing plate portions 13 and 13 in the vicinity of the filling port portion 3 in the vicinity of the filling port portion 3 has an arc shape, the same applies to the vicinity of the filling port portion 3 as well. The effect is obtained.

  Next, the cool storage agent container of 2nd and 3rd embodiment is demonstrated, referring FIG.6 and FIG.7. Regarding the second and third embodiments that are not particularly described, the description in detail regarding the first embodiment is applied as appropriate. Moreover, in FIG.6 and FIG.7, the same code | symbol is attached | subjected to the same member as FIGS.

In the regenerator container 10 according to the second preferred embodiment of the present invention, the outer surface of the container wall portion in the reinforcing recess 2 is formed of a depressed bottom surface 21 and a depressed inclined surface 22 as shown in FIG. FIG. 6B shows a cross section passing through the center of the depressed bottom surface 21 which is perpendicular to the pair of container wall portions 11A and 11B at the intersection 23 between the depressed bottom surface 21 and the depressed inclined surface 22 and is circular. As shown, it has an arcuate shape. Specifically, the arcuate shape is formed by two straight portions 24 and 24. In the present specification, the arc shape includes a straight line portion in addition to the curved portion as in the first embodiment.
When the reinforcing concave portion 2 of the present embodiment is viewed in plan, the intersecting portion 23 is formed along the outer periphery of the depressed bottom surface 21 that is circular. In the case where the cool storage agent container 10 of the present embodiment is produced by, for example, blow molding, in the truncated cone-shaped portion of the mold used for blow molding, the round corner portion of the outer periphery of the top surface has two steps. A chamfer is formed.

  In the cool storage agent container 10 of the present embodiment, the length of the straight portion 24 at the intersecting portion 23 of the reinforcing concave portion 2 is preferably 0.05 mm to 5 mm from the same viewpoint as described in the previous embodiment. And 0.1 mm to 1 mm is particularly preferable. The intersecting portion 23 of the reinforcing recess 2 of the present embodiment is formed of two straight portions 24, 24, but the lengths of the two straight portions may be the same or different.

  According to the cool storage agent container 10 of this embodiment mentioned above, it has the same effect as 1st Embodiment.

As shown in FIG. 7, a regenerator container 10 according to a third preferred embodiment of the present invention is provided with four reinforcing recesses 2, 2... Arranged side by side in the longitudinal direction on each side in the longitudinal direction of the container wall 11A. It has been. Further, in addition to the reinforcing concave portion 2, each of the pair of gripping portions 4, 4 is formed along the outer side in the width direction of the four reinforcing concave portions 2, 2.
Each of the pair of gripping portions 4 and 4 is formed by sinking the opposing portions of the pair of flat container wall portions 11A and 11B and joining the inner surfaces of the recessed container wall portions. Each of the pair of gripping parts 4 and 4 is a part that is gripped by hand when carrying the cool storage agent container 10. In FIG. 7, only one container wall 11 </ b> A is shown, but the pair of gripping parts 4, 4 are similarly formed in the other container wall 11 </ b> B.
Each of the pair of gripping portions 4 and 4 has a shape in which a pair of inverted square frustum shapes are joined at the top surfaces. The top surface of the quadrangular frustum shape is formed from a depressed bottom surface 21 ′, and the side surface of the quadrangular frustum shape is formed from a depressed inclined surface 22 ′.

  As shown in FIG. 7, each of the pair of gripping portions 4 and 4 has an outer surface formed of one recessed bottom surface 21 ′ and four recessed inclined surfaces 22 ′, and is similar to the above-described reinforcing recess. Is formed. Thus, the pair of gripping portions 4 and 4 also have a function of a reinforcing concave portion.

  According to the cool storage agent container of the present embodiment described above, the pair of grip portions 4 and 4 are provided, and the operability is improved. Further, the pair of gripping portions 4 and 4 have the same effect as the above-described reinforcing concave portion.

In addition, although not shown in figure, it is also preferable that the recessed part 2 for a reinforcement has a shape where a pair of inverted square frustum shape was joined by top surfaces. The top surface of the quadrangular frustum shape is formed from a depressed bottom surface 21, and the side surface of the quadrangular frustum shape is formed from a depressed inclined surface 22.
Thus, when the shape of the depressed bottom surface 21 of the concave portion for reinforcement 2 and the shape of the outer surface of the container wall portion are both square, the longer one side of the depressed bottom surface 21 is, the longer the partial portions of the pair of container wall portions 11A and 11B are. From the viewpoint of preventing the deformation of the container wall during freezing of the stored agent, the bonding area is increased, and the size suitable for the hand is preferable for the purpose of gripping. On the other hand, the shorter one side of the depressed bottom surface 21 is preferable from the viewpoint of increasing the volume of the hollow portion of the cool storage agent container 10 and increasing the capacity of the stored cool storage agent. Therefore, from the balance of both, the length of one side of the depressed bottom surface 21 is preferably 60 mm to 110 mm. The length of one side of the reinforcing recess 2 on the outer surface of the container wall is preferably longer than the length of one side of the depressed bottom surface 21 and is preferably 70 mm to 150 mm from the same viewpoint as described above. .

  The cool storage agent container of the present invention is not limited to the above-described embodiment, and can be appropriately changed without departing from the gist of the present invention.

For example, in each embodiment in the cool storage agent container of the present invention, four or eight reinforcing recesses 2 are provided, but the reinforcing recess 2 may be one.
Moreover, in each embodiment, although the depression bottom face 21 is a plane, it may be a curved surface convex toward the inside of a container. In this case, it is preferable to form a curved surface in which the depressed inclined surface 22 and the depressed bottom surface 21 are continuously connected, for example, a part of a spherical surface or an ellipsoidal surface.
In each embodiment, the cool storage agent container 10 has a flat rectangular parallelepiped shape as a whole, but is not limited thereto, and may be a flat cylindrical shape or an elliptical cylindrical shape, or a plane thereof. A cylindrical shape having a polygonal shape may be used.
In the first embodiment, the arc shape of the intersecting portion 23 of the reinforcing recess 2 is a part of a circle, but may be a part of an ellipse.
Moreover, in 1st Embodiment, although the circular arc shape of the cross | intersection part 23 of each recessed part 2 for reinforcement is a part of a circle, you may form from a part of circle and a linear part.
In the second embodiment, the arcuate shape of the intersecting portion 23 of the reinforcing recess 2 may be formed of one or three or more straight portions 24.

  The description omission part in one embodiment mentioned above and the part which only one embodiment has can mutually be utilized suitably.

  Hereinafter, the present invention will be further described using examples. However, the scope of the present invention is not limited to such examples.

[Example 1]
A regenerator container 10 as shown in FIGS. 1 and 2 was produced. The material for forming the regenerator container 10 was produced by blow molding using high-density polyethylene. A pair of mating dies were used for blow molding. Each of the pair of matching molds was provided with frustoconical portions at opposing portions, and the outer peripheral portion of the circular portion, which is the top surface of the frustoconical shape, was chamfered with a predetermined radius of curvature. The external dimensions of the regenerator container 10 were 230 mm in length, 150 mm in width, 35 mm in thickness, and an internal volume of 1000 ml. One reinforcing recess 2 was formed at the center of the pair of container wall portions 11A and 11B. The planar shape of the depressed bottom surface 21 of the reinforcing concave portion 2 and the planar shape of the outer surface of the container wall portion are both circular, the diameters are 6 mm and 17 mm, and the depth of the reinforcing concave portion 2 is 16.5 mm. . The arc shape at the intersection 23 is a part of a circle, the radius of curvature is 2.0 mm, and the length measured along the arc of the arc shape is about 1.8 mm. Thus, the cold storage agent container of Example 1 was obtained.

[Example 2]
The outer dimensions were 220 mm in length, 140 mm in width, 21 mm in thickness, and the inner volume was 550 ml. Four reinforcing recesses 2 were formed as shown in FIGS. The planar shape of the recessed bottom surface 21 of the reinforcing recess 2 and the planar shape of the outer surface of the container wall are both circular, the diameters thereof being 8 mm and 26 mm, and the depth of the reinforcing recess 2 being 9.5 mm. . The arc shape at the intersection 23 is a part of a circle, the radius of curvature is 1.0 mm, and the length measured along the arc of the arc shape is about 0.8 mm. Others are the same as that of Example 1, and the cool storage agent container of Example 2 was obtained.

[Example 3]
The outer dimensions were 335 mm in length, 200 mm in width, 19 mm in thickness, and an internal volume of 950 ml. Eight reinforcing recesses 2 were formed as shown in FIG. The planar shape of the recessed bottom surface 21 of the reinforcing recess 2 and the planar shape of the outer surface of the container wall are both circular, the diameters thereof being 8 mm and 18 mm, and the depth of the reinforcing recess 2 being 8.5 mm. . The arc shape at the intersection 23 is a part of a circle, the radius of curvature is 1.0 mm, and the length measured along the arc of the arc shape is about 1.3 mm. Others are the same as that of Example 1, and the cool storage agent container of Example 3 was obtained.

[Example 4]
The outer dimensions were 335 mm in length, 200 mm in width, 19 mm in thickness, and an internal volume of 950 ml. Eight reinforcing recesses 2 were formed as shown in FIG. The planar shape of the recessed bottom surface 21 of the reinforcing recess 2 and the planar shape of the outer surface of the container wall are both circular, the diameters thereof being 8 mm and 18 mm, and the depth of the reinforcing recess 2 being 8.5 mm. . The arc shape at the intersection 23 is a part of a circle, the radius of curvature is 1.5 mm, and the length measured along the arc of the arc shape is about 1.6 mm. Others are the same as that of Example 1, and the cool storage agent container of Example 4 was obtained.

[Comparative Example 1]
The outer dimensions were 230 mm in length, 150 mm in width, 35 mm in thickness, and the inner volume was 1000 ml. One reinforcing recess 2 was formed in the same manner as in Example 1. The planar shape of the depressed bottom surface 21 of the reinforcing concave portion 2 and the planar shape of the outer surface of the container wall portion are both circular, the diameters are 6 mm and 17 mm, and the depth of the reinforcing concave portion 2 is 16.5 mm. . The mold was not chamfered in blow molding, but an undulating arc shape was formed at the intersecting portion 23 of the reinforcing concave portion 2, the radius of curvature was 0.1 to 0.2 mm, and the arc shape The length measured along the arc of the shape was about 0.2 mm. Others are the same as that of Example 1, and the cool storage agent container of the comparative example 1 was obtained.

[Comparative Example 2]
The outer dimensions were 220 mm in length, 140 mm in width, 21 mm in thickness, and the inner volume was 550 ml. Four reinforcing recesses 2 were formed as shown in FIGS. The planar shape of the recessed bottom surface 21 of the reinforcing recess 2 and the planar shape of the outer surface of the container wall are both circular, the diameters thereof being 8 mm and 26 mm, and the depth of the reinforcing recess 2 being 9.5 mm. . The mold was not chamfered in blow molding, but an undulating arc shape was formed at the intersecting portion 23, the radius of curvature was 0.2 to 0.3 mm, and along the arc of the arc shape. The measured length was about 0.3 mm. Others are the same as that of Example 1, and the cool storage agent container of the comparative example 2 was obtained.

[Freeze-thaw test]
Using the regenerator container of Example 1 and Comparative Example 1 described above, a gel (water 99.5% by mass, thickener (polyacrylic acid) 0.5% by mass) frozen at 0 ° C. as a regenerator Filled 98% by volume of the volume. Each filled cold storage agent container was allowed to stand at −30 ° C. for 24 hours to completely freeze the cold storage agent, and then naturally thawed in a constant temperature environment of 25 ° C. This was repeated 30 times, and changes in the cold storage agent container were examined. Ten test samples of Example 1 and Comparative Example 1 were used.
The results are shown in Table 1.

  As is clear from the results shown in Table 1, it can be seen that the cool storage agent container of the present example has less damage to the reinforcing recesses due to the expansion pressure accompanying freezing of the cool storage agent than the comparative example. In the cool storage agent container of the comparative example, 10% cannot withstand repeated use of 30 times or more of freezing and thawing, whereas the cool storage agent container of this example can withstand repeated use of 30 times or more of freezing and thawing. .

[Drop test]
Using the regenerator containers of Examples 1 to 4 and Comparative Examples 1 and 2 described above, a gel (water content 99.5% by mass, thickener (polyacrylic acid) 0.5% by mass) frozen at 0 ° C. as a regenerator. ) Was filled to 85% by volume of the container volume. The cool storage agent container dropped from a height of 1 m onto an iron plate having a thickness of 10 mm. When the cool storage agent container was dropped, each of the eight parts shown in FIG. 8 was dropped downward once, and dropped eight times in total. The order of dropping was clockwise from the part a to the part h with the logo face up. 25 test samples of Examples 1 to 4 and Comparative Examples 1 and 2 were used. The cool storage agent was not frozen, and a drop test was performed in a constant temperature environment of 25 ° C.
The results are shown in Table 2. The breakage rate was determined by dividing the number of damaged regenerator containers by 25, multiplying it by 100, and rounding off after the decimal point.

  As is clear from the results shown in Table 2, it can be seen that the breakage rate of the cool storage agent container of this example is lower than that of the comparative example. This is because the regenerator container of this example having a radius of curvature of 0.4 mm or more at the intersection of the reinforcing recesses is broken due to the stress at the intersection of the reinforcing recesses being dispersed against the impact at the time of dropping. This is because it is difficult to do. In particular, Examples 1 and 4 having a large radius of curvature at the intersection have a low damage rate against a drop impact.

FIG. 1 is a perspective view showing a first embodiment of the cool storage agent container of the present invention. FIG. 2 is a plan view of the first embodiment shown in FIG. 3 is an enlarged cross-sectional view taken along line XX of FIG. FIG. 4 is a cross-sectional view showing the main part shown in FIG. 3 further enlarged. FIG. 5 is an enlarged sectional view taken along line YY in FIG. FIG. 6 shows a main part of the second embodiment of the regenerator container according to the present invention, wherein (a) is a view corresponding to FIG. 3, and (b) is a view corresponding to FIG. FIG. 7 is a perspective view showing a third embodiment of the cool storage agent container of the present invention. FIG. 8 is a plan view for explaining a drop test in the example. FIGS. 9A and 9B show a conventional regenerator container having a reinforcing recess, where FIG. 9A is a view corresponding to FIG. 3, and FIG. 9B is a view corresponding to FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Cold storage container 11A, 11B Container wall part 12 Container peripheral wall 13 Reinforcement board part 2 Reinforcing recessed part 21 Depressed bottom face 22 Depressed inclined surface 23 Intersection part 24 Straight part 3 Filling port part 31 Filling opening part 32 Overhang part 33 Joint part 34 Overhang Intersection with the outer surface of the lower part of the part 35 Intersection with the outer surface of the container peripheral wall 4 Gripping part

Claims (8)

One or a plurality of reinforcing recesses formed by recessing one or a plurality of opposing portions of the pair of flat container wall portions and joining the concave inner surfaces of the flat container wall portions to each other In a regenerator container having
The outer surface of the flat container wall portion in the reinforcing recess is formed from a depressed bottom surface and a depressed inclined surface,
A regenerator container in which a vertical section with respect to a pair of the flat container wall portions at an intersection of the depressed bottom surface and the depressed inclined surface has an arc shape.   The regenerator container according to claim 1, wherein the arc shape is a part of a circle or an ellipse.   The regenerator container according to claim 2, wherein a radius of curvature of the arc shape is 0.4 mm to 5 mm.   The cold storage agent container according to claim 2 or 3, wherein a length along the arc of the arc shape is 0.5 mm to 6 mm.   The regenerator container according to claim 1, wherein the arc shape is formed of one or more straight portions.   The regenerator container according to claim 5, wherein the straight portion has a length of 0.05 mm to 5 mm.   The cold storage container according to any one of claims 1 to 6, wherein the reinforcing concave portion has a shape in which a pair of inverted frustoconical shapes are joined at top surfaces. The overall shape is a flat rectangular parallelepiped shape or a flat cylindrical shape, and the peripheral wall of the container is formed by bending and joining extensions of a pair of the flat plate-like container wall parts, and a filling mouth part is formed in a part of the peripheral wall of the container The regenerator container according to any one of claims 1 to 7, wherein the filling port portion is formed by a non-joining portion in which a part of inner surfaces of the container peripheral wall are joined to each other.

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