JP2006124013A - Portable heat insulating container - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a portable heat insulating container which is provided with the heat retaining characteristic a thermos has and the light weight characteristic a PET bottle has. <P>SOLUTION: This portable heat insulating container 1 comprises a vacuum heat insulating material 2 for heat insulating a side face, a foamed resin 3 for heat insulating a cap part and a bottom part and a PET inside container 4. The vacuum heat insulating material 2 is formed by decompressing and encapsulating a core material 5 in a gas barrier film 6. The core material 5 is formed by adding and mixing 5 wt.% carbon black power relative to dry powder silica. Cohesion is controlled by the influence of surface charge of silica and carbon black because the vacuum heat insulating material 2 uses the core material 5 formed by mixing silica powder and carbon black, and as a result it can be made in a low density, i.e. a core material having a density of 100-200 kg/m<SP>3</SP>is manufactured to provide as a result the light portable heat insulating container. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a portable heat insulating container excellent in heat retention and light weight.

  2. Description of the Related Art Conventionally, a thermos bottle is known as a portable heat insulating container that keeps and cools beverages such as tea, juice, and coffee. The thermos has a structure in which the hollow part of the double container is set to a high vacuum, and the outer part of the inner bottle is plated or metal foil. The hollow part of the double container is evacuated to suppress heat conduction and convection. In addition, the radiant heat is cut by plating or metal foil, and excellent heat insulation performance is exhibited.

  However, in order to maintain a high vacuum, the material of the container is limited to glass, stainless steel, titanium, etc., and there is a problem that it is heavy and bulky.

  On the other hand, there is a portable heat insulating container that uses a lightweight material filled with a plastic double container filled with a heat insulating material such as urethane foam. In order to obtain heat insulation as high as a thermos, a thickness of 5 cm or more is required, and there is no one that has both compactness and high heat insulation.

  In addition, as a soft drink, the demand for plastic bottle drinks has been increasing in recent years. Plastic bottle drinks are very light and can be used as a replacement for water bottles because of their lids. However, there is no cooling effect.

  For this reason, cold covers made of non-woven fabric with a cotton-filled cloth or an aluminum vapor-deposited film are on the market. These covers are effective for a short time of about 1 hour, but not for a long time, and are hardly effective for long trips such as excursions and picnics.

  As a measure for solving these problems, there is one disclosed in Patent Document 1.

Patent Document 1 proposes a portable heat insulating container to which a vacuum heat insulating material in which at least one kind of core material selected from a fiber structure, a resin foam, and a granular material is sealed with a gas barrier film is applied.
JP 2002-58604 A

  However, when a fiber structure is used for the core material, there is rarely a case where the fiber itself or a small amount of shots (glass-like lumps) mixed in the fiber leaks when bending around a plastic bottle. is there.

  On the other hand, when a resin foam is used for the core material, it is difficult to reduce the thickness because it is a foam, and the thickness of the vacuum heat insulating material is 10 mm or more.

  As a measure to improve this, it is necessary to cut the foam and process it into a thin-walled foam, which not only increases the cost, but also causes the foam to warp during cutting, causing a problem in shape. is there.

  In addition, granular materials are also described, and specific examples include pearlite, diatomaceous earth, glass balloon, shirasu balloon, calcium silicate, silica airgel, and the like.

  However, diatomaceous earth, glass balloons, shirasu balloons, calcium silicates and the like have a problem that the density becomes high and the weight becomes heavy, and there is a problem that the cost of the dry silica alone such as silica airgel becomes high.

  The present invention provides a portable heat-insulating container excellent in heat retaining properties and light weight in view of the above-described problems of the prior art.

  In order to achieve the above object, the portable heat insulating container of the present invention uses, as a heat insulating wall, a vacuum heat insulating material comprising a mixed material containing at least dry silica powder and carbon black powder as a core and sealed under reduced pressure with a gas barrier film. It was used.

  Thereby, the portable heat insulation container excellent in heat insulation cold retention, lightweight property, and compactness can be provided.

  ADVANTAGE OF THE INVENTION According to this invention, the portable heat insulation container excellent in heat insulation cold retention, lightweight property, and compactness can be provided.

  The invention of the portable heat insulation container according to claim 1 of the present invention is characterized in that a vacuum heat insulating material formed by vacuum-sealing a mixed material containing at least dry silica powder and carbon black powder with a gas barrier film is used as a heat insulating wall. A vacuum insulation material that uses a mixed material containing at least dry-type silica powder and carbon black powder as the core material is used for the insulation wall, so it is portable with excellent thermal insulation, light weight, and compactness. An insulated container can be provided.

  According to a second aspect of the present invention, the gas barrier film according to the first aspect of the present invention is a laminated structure.

  The invention of the portable heat insulating container according to claim 3 is the invention according to claim 1 or 2, wherein a plurality of grooves for bending the vacuum heat insulating material are formed on at least one surface of the vacuum heat insulating material. .

  According to a fourth aspect of the present invention, the thickness of the vacuum heat insulating material according to any one of the first to third aspects is 1 to 10 mm.

The invention of the portable heat insulating container according to claim 5 is such that the density of the core material in the invention according to any one of claims 1 to 4 is 100 to 200 kg / m ³ .

  The invention of the portable heat insulation container according to claim 6 uses the vacuum heat insulating material according to any one of claims 1 to 5 on the side surface of the container.

  According to a seventh aspect of the present invention, the portable heat insulating container according to any one of the first to sixth aspects covers a plastic bottle.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
FIG. 1 is a perspective view of a portable heat insulating container according to Embodiment 1 of the present invention, and FIG.

  As shown in FIGS. 1 and 2, the portable heat insulating container 1 is formed of a vacuum heat insulating material 2 that insulates the side surface and a lid, a foamed resin 3 that insulates the bottom, and a PET inner container 4. The vacuum heat insulating material 2 includes a core material 5 and a gas barrier film 6 covering the core material 5, and the core material 5 is sealed in the gas barrier film 6 under reduced pressure.

  The core material 5 is made of a material composed of dry silica powder and carbon black powder, and is prepared by adding and mixing 5% by weight of carbon black powder to the dry silica powder.

  In addition, since the core material 5 obtained in this way is a powder material and does not have shape retention, it is filled into a bag having air permeability, and then filled into a gas barrier film 6 and evacuated under reduced pressure.

  As a method other than this, it is possible to fill the core material 5 with inorganic fibers such as glass wool as an aggregate, and to form a solid material by pressure molding. In this case, a bag having air permeability becomes unnecessary.

  The gas barrier film 6 includes a nylon layer having a thickness of 15 μm as an outermost layer, an aluminum foil layer having a thickness of 6 μm as an intermediate layer, and a low density polyethylene layer having a thickness of 50 μm as an inner layer.

In the vacuum heat insulating material 2 configured as described above, since the core material 5 is a core material 5 made of a mixture of silica powder and carbon black, the cohesive force is controlled by the influence of the surface charge of carbon black and silica. As a result, the density can be reduced, and a core material having a core density of 100 to 200 kg / m ³ can be produced. As a result, a portable heat insulating container excellent in light weight can be provided.

When powder materials such as diatomaceous earth, glass balloon, shirasu balloon, and calcium silicate are used, the core material density becomes about 300 kg / m ³ and the weight becomes heavy.

  The configuration of the gas barrier film 6 is not limited to the present embodiment, and an aluminum foil laminated film may be used on one side and an aluminum vapor deposited laminated film on the other side. In the case of applying aluminum vapor deposition, it is necessary to enhance the gas barrier property, and it is desirable to use a film obtained by vapor-depositing aluminum on an ethylene-vinyl alcohol copolymer resin film of 12 μm on the intermediate layer.

  Further, as a measure for enhancing gas barrier properties, a 12 μm polyethylene terephthalate resin film subjected to aluminum vapor deposition may be added to the intermediate layer. In this case, the gas barrier property is further enhanced when the vapor-deposited surface of the ethylene-vinyl alcohol copolymer resin film and the vapor-deposited surface of the polyethylene terephthalate resin film are bonded together.

  Various film materials can also be applied to the inner heat-welding layer, and various resin films such as linear low-density polyethylene, high-density polyethylene, and polyacrylonitrile resin can be applied.

  The outermost layer has a protective role, and in addition to the nylon layer, polyethylene-terephthalate resin or both of them may be applied.

  Furthermore, various forms can be applied to the bag form of the gas barrier film, and there is no problem even if a three-side sealed bag, a pillow form, a gusset form, a ribbon form, or the like is used. By using these forms, it is possible to reduce the heat-welded area at the peripheral portion, so that the amount of gas intrusion from the heat-welded portion can be suppressed, and when used for a long time, the performance of the portable heat insulating container It is possible to suppress the deterioration rate.

  In addition, since the heat welded portion at the peripheral edge of the vacuum heat insulating material 2 is reduced, a portion called a fin portion can be reduced, and the mounting property and the like are improved.

  The manufacturing method of the vacuum heat insulating material 2 having such a structure is as follows. First, a predetermined amount of powder made of a mixture of dry silica powder and carbon black powder is weighed and filled in a bag having air permeability, and then at a temperature of 120 ° C. Unnecessary moisture was removed by drying for 1 hour to prepare the core material 2.

  Thereafter, the core material 2 was inserted into the gas barrier film 6 and evacuated for a predetermined time in the vacuum chamber, and the opening was welded and sealed by heat sealing, whereby the vacuum heat insulating material 2 was obtained.

  As a result of measuring the thermal conductivity of the vacuum heat insulating material 2 thus obtained, the thermal conductivity was 0.0030 W / mK. The measuring instrument used was Auto-Λ073 manufactured by Eihiro Seiki Co., Ltd., and the measurement was performed at an average temperature of 24 ° C.

  In addition, as for the dimension of the produced vacuum heat insulating material 2, the core material 5 part was 200x600 mm, and thickness was 8 mm.

  The cold insulation effect which applied the vacuum heat insulating material 2 produced in this way was measured.

  Water of 5 ° C. was put into a 500 ml PET bottle, stored in the portable heat insulating container 1, and left in an atmosphere with an external temperature of 30 ° C., and the passage of time and the water temperature were measured. As a result, the water temperature after 6 hours was about 11 ° C. and increased by about 6 ° C. As a comparative example, in the vacuum heat insulating material using diatomaceous earth, the temperature increased by 10 ° C. after 6 hours, and a large difference was confirmed in the heat insulation and cooling performance.

Moreover, although the density of the core material 5 of this Embodiment was changed to 100-200 kg / m < ³ >, the big difference was not recognized in the performance, and the favorable result was obtained.

(Embodiment 2)
FIG. 3 is a perspective view showing a vacuum heat insulating material used in the portable heat insulating container according to Embodiment 2 of the present invention.

  As shown in FIG. 3, the vacuum heat insulating material 7 used for the portable heat insulating container in the second embodiment is a vacuum heat insulating material in which a groove portion 8 is formed substantially perpendicular to the bending direction. Since such a groove portion 8 is formed and the groove portion 8 is formed substantially perpendicular to the bending direction, bending can be easily performed.

  As a result, the mounting property to the PET bottle is improved, a large gap is formed between the PET bottle and the vacuum heat insulating material, and the problem that the heat insulation / cooling performance is lowered is solved.

  The groove depth is preferably about 3 to 5 mm, and if the groove depth is further increased, the vacuum heat insulating material 7 is deformed. Further, in the case of groove processing of about 2 mm, the bending workability is not improved and the heat insulation and cooling effect cannot be improved.

  As a confirmation experiment, a comparison experiment with the first embodiment was performed.

  As a result, when the groove depth was 3 to 5 mm, all showed good results, and the water temperature increase after 6 hours was 3 ° C., which was a greatly improved result.

  Note that the thickness of the vacuum heat insulating material 7 has a great influence in consideration of the ease of mounting on a PET bottle. Specifically, it is desirable to make it 10 mm or less. If it is larger than 10 mm, ridge lines are likely to be formed at the four corners of the vacuum heat insulating material 7, and stress is constantly applied to the gas barrier film, so that there is a high possibility of leakage due to stress cracks. Therefore, the thickness of the vacuum heat insulating material 7 is desirably 10 mm or less, and it is desirable to have a thickness of 1 mm or more in consideration of productivity and performance as a portable heat insulating container. From the above, it has been found that application with a thickness of 1 to 10 mm is suitable as a portable heat insulating container as in the present invention.

  In the first and second embodiments, since the vacuum heat insulating materials 2 and 7 are applied to the side surfaces of the inner container 4, most of the surface area of the inner container 4 is covered. The effect can be fully extracted.

  Naturally, if a vacuum heat insulating material having an irregular shape is produced and applied to the lid portion or the bottom portion, further heat insulation and cooling performance can be improved.

  Since it is a portable heat insulating container having the above-described features, when a plastic bottle is stored, it is possible to apply a lightweight and compact portable heat insulating container that exhibits a heat insulation and cooling function equivalent to a thermos bottle.

  Since the portable insulated container of the present invention is excellent in heat insulation and cold retention, lightness and compactness, it can be applied not only to insulation and preservation of PET bottles but also to insulation and preservation of can drinks, paper pack drinks, canned foods, etc. .

The perspective view of the portable heat insulation container in Embodiment 1 of this invention Sectional drawing of the vacuum heat insulating material used for the portable heat insulation container of the embodiment The perspective view which shows the vacuum heat insulating material used for the portable heat insulation container in Embodiment 2 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Portable heat insulation container 2 Vacuum heat insulating material 5 Core material 6 Gas barrier film 7 Vacuum heat insulating material 8 Groove part

Claims (7)

  A portable heat insulation container using a heat insulating wall made of a vacuum heat insulating material, which is made of a mixed material containing at least dry silica powder and carbon black powder and sealed with a gas barrier film under reduced pressure.   The portable heat insulating container according to claim 1, wherein the gas barrier film is a laminated structure.   The portable heat insulating container according to claim 1 or 2, wherein a plurality of grooves for bending the vacuum heat insulating material are formed on at least one surface of the vacuum heat insulating material.   The thickness of a vacuum heat insulating material is 1-10 mm, The portable heat insulation container as described in any one of Claim 1 to 3. The density of a core material is 100-200 kg / m < ³ >, The portable heat insulation container as described in any one of Claim 1 to 4 characterized by the above-mentioned.   The portable heat insulating container according to any one of claims 1 to 5, wherein a vacuum heat insulating material is used on a side surface of the container.   The portable heat insulating container according to any one of claims 1 to 6, wherein the portable heat insulating container covers a plastic bottle.

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