JPH0228899Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a cold bag with high cooling efficiency, and more particularly, to a cold bag with high cooling efficiency and ease of use.

In this specification, "cold storage" refers to cooling a cold storage material with a cooling source to store cold heat (that is, negative energy).In other words, by cold storage, the cold storage material cools the object to be cooled. Gain the ability to cool down.

In this specification, "cooling" refers to cooling an object or object to be cooled with a cold storage material to release cold heat (i.e., negative energy), in other words, cooling by cooling. The material loses its ability to cool the object it is trying to cool.

In the present invention, the cold storage material is cooled by the cold storage of the cold storage material, but the object to be cooled is cooled by the cooling of the cold storage material, so "cooling" in this specification refers to cooling. It is necessary to pay attention to the target.

In this specification, the "cold storage temperature" of a cold storage material means that when the cold storage material is cooled by a cooling source (that is, when the cold storage material is stored), water contained in the hydrous gel of the cold storage material freezes and the cold storage material is cooled. This is the temperature at which latent heat equivalent to the heat of fusion of the material is absorbed by the cooling source (i.e., the freezing temperature of the water contained in the hydrous gel); When cooling (that is, when cooling a cold storage material), the frozen material contained in the hydrous gel of the cold storage material melts, and the object or object to be cooled transfers latent heat corresponding to the heat of fusion of the frozen material to the cold storage material. (i.e., the melting temperature of the water contained in the hydrogel). Therefore, when the water contained in the hydrous gel is pure water, its cooling temperature is approximately 0°C, but when other substances are dissolved, it varies depending on the type and content thereof.

[Background of the invention and prior art]

A cold storage material is a material that acquires the ability to cool an object or object to be cooled by storing cold, and loses the ability to cool the object or object to be cooled by cooling. It is one of a kind.

In principle, the typical cold storage material known so far is water, but since water is ubiquitous and inexpensive, ice that stores water can be released. After cooling, storing the coolant again is not carried out unless there are extreme circumstances. Carbon dioxide also has the function of a cold storage material when it is in the form of dry ice, but as dry ice is allowed to cool, it becomes gaseous, so it is virtually impossible to recover it. Furthermore, "liquid nitrogen" also has the function of a cold storage material, but since its product is gaseous, its recovery is practically impossible.

When considered as a cold storage material, water is widely used because it has a large heat of fusion at the cold storage temperature and the material itself is inexpensive. The disadvantage is that this must be removed from the system.

To overcome this drawback, several cold storage materials that can repeatedly store and release cold have been developed. For example, a cold insulator made by filling a rubber or plastic bag with a water-containing gel obtained by adding borax or boric acid to an aqueous solution of polyvinyl alcohol, and a polyacetic acid obtained by dispersing polyvinyl acetate in an aqueous solution of polyvinyl alcohol. There is a cooler/heater in which a similar bag is filled with a water-containing gel obtained by adding borax or boric acid to vinyl emulsion (Utility Model Publication No. 45-27082). A cold storage material made of a hydrous gel and polyacrylic acid containing at least 2
There is also a cold storage material made of a hydrous gel obtained by adding a compound having epoxy groups (Japanese Patent Publication No. 57-28505
Since these cold storage materials undergo plastic deformation at temperatures around the cold storage temperature, they are unable to maintain a constant shape. Also, if the cold storage material is stored at a temperature lower than its cold storage temperature,
The cold storage material remains in its previous irregular shape,
It becomes hard, so it is very difficult to use. For this reason, in conventional cold storage materials, the cold storage temperature is set as low as possible to prevent the cold storage material from freezing and becoming hard during cold storage. However, the reason why the cold storage material does not harden during cold storage is that the water in the hydrous gel in the cold storage material does not freeze, and the latent heat corresponding to the heat of fusion cannot be used during cooling. This will reduce the cooling efficiency of the material and the cooling capacity.

In order to improve these drawbacks of cold storage materials, the inventor of the present invention has conducted extensive research and has developed a cold storage material that does not undergo plastic deformation before and after the cold storage temperature of the cold storage material, and has also put this into practical use. They completed the present invention which can be used.

[Purpose of the invention and summary of the invention]

The purpose of the present invention is to provide a cold bag that has high cooling efficiency and is easy to use.

Another object of the present invention is to provide a cold bag that has a large cooling capacity, is soft to the touch, and can be deformed even at cold temperatures.

The present invention consists of a laminated film consisting of a cold insulating material layer with many holes and a film without holes, and a cold storage material having a property of not plastically deforming at temperatures before and after the cold storage temperature, and the said cold storage material is the said laminated film. A cold insulating bag characterized in that the cold insulating bag is covered with a cold insulating bag, and a cold insulating bag in which the cold storage material is in the form of small particles, granules, flakes, or coarsely crushed pieces.

[Specific explanation of the idea]

1 to 4 each show an embodiment of the cold insulating bag of the present invention, 1 is a cold insulating bag, 2 is a cold storage material 5
3 is a film, 4 is a cold insulating material layer, and 6 is a hole drilled in the cold insulating material layer 4.

FIG. 5 shows an embodiment of the laminated film 2, in which 3 is a film, 4 is a cold insulating material layer, 6 is a hole drilled in the cold insulating material layer, 7 is a metal thin film layer, 8 is a reinforcing material layer, and 9 is an adhesive layer of the cold insulation material layer 4.

FIG. 6 shows a fabric of one embodiment of the reinforcing material layer 8, in which 10 is a strip obtained by stretching a polyethylene film or a polypropylene film in one direction and tearing it in the stretching direction, and 11 is a strip obtained by stretching a polyethylene film or a polypropylene film in one direction and tearing it in the stretching direction. It is an intersection.

The cold storage material layer 4 in the laminated film 2 of the cold storage bag of the present invention has a large number of holes as shown in FIGS. When the cold storage bag of the present invention is directly connected to store cold, the cold storage material 5 is cooled by the cooling source at the location where this hole is located. Therefore, the size of this hole cannot be too small, but if it is too large, the insulation effect of the cold insulation material layer 4 will be lost, so an appropriate size is required, and it should be 1/1 of the surface area of the cold bag. Preferably, 4 to 3/4 of the area is occupied by holes. Further, the shape of the hole does not need to be particularly defined, and can be made into any shape such as a circle, a round shape, or a rectangular shape.

In the cold storage material layer 4, the cold heat (negative energy that can cool other objects or objects) stored in the cold storage material 5 is not transmitted to the outer surface at the cold storage temperature and becomes a relaxed low temperature. Materials to be laminated on the film 3 in order to achieve this, and which have low thermal conductivity and are known as cold insulators, such as felts, carbonized cork, vinylidene chloride felt, hard foam rubber, polyurethane foam, expanded polystyrene, and polyethylene foam. , polypropylene foam, phenol foam, hard vinyl chloride foam, etc. are used as materials for cold insulation materials.

Among the above materials, if a material with high elasticity is used, when the cold bag is used for the human body, for example,
When used as an ice pillow or cold ship, the cold bag comes into soft contact with the human body, so even if the cold storage material is cooled to a temperature below the cold storage temperature and becomes hard, there is no problem, and the cold temperature of the cold storage material can be directly transferred to the human body. This has the advantage that the cold storage temperature of the cold storage material can be set low because the cold temperature is moderated without being transmitted to the cold.

The film 3 laminated on the cold insulating material layer 4 may be made of any ordinary film material. For example, paper, waterproof paper, cellophane, woven fabric, non-woven fabric, coated with plastic, or plastic film can be used. When the metal thin film layer 7 is laminated on the laminated film 2, the film is preferably made of a material that is transparent in appearance. Considering these points, it is preferable to use a plastic film as the film 3 laminated on the cold insulating material layer 4.

Plastic films include polyesters such as polyethylene terephthalate, polyethylene terephthalate isophthalate, poly-1,4-cyclohexylene-dimethylene terephthalate, polyethylene oxybenzoate, polycaprolactam, polylaurinlactam, polyhexamethylene adipamide, and polyhexane. polyamides such as methylene sebaamide, poly-1,4-cyclohexylene adipamide, polydioxyphenyl methane carbonate, polydioxydiphenyl ethane carbonate, polydioxydiphenyl-2,
2-propane carbonate, carbonates such as poly-p-xylene glycol biscarbonate, cellulose esters such as cellulose acetate, fluororesins such as polyvinyl fluoride, polytetrafluoroethylene, tetrafluoroethylene-hexafluoropropylene copolymer, Films such as polyolefins such as polyethylene, polypropylene, and polybutene, polyvinyl chloride, polystyrene, and polyvinylidene chloride can be used, but from the viewpoint of economy and handling during use, polyethylene terephthalate, polycaprolactam, etc. can be used. Particular preference is given to using polyhexamethylene adipamide or polyhexamethylene adipamide.

As shown in FIG. 5, the laminated film 2 can have metal thin film layers 7 laminated thereon. Metal thin film layer 7
By laminating them, not only the appearance becomes beautiful, but also the influence of light from the outside world on the cool storage material 5 can be prevented. The metal thin film layer 7 may be a metal foil, a metal evaporated layer formed by a vacuum evaporation method, or a metal thin film layer formed by an ion plate method or a metal sputtering method. It may be metal. For example, aluminum, zinc, gold, silver, chromium, nickel, copper, selenium, magnesium fluoride, zinc sulfide, and silicon monoxide are well-known materials that can be used in vacuum deposition methods, but from an economical point of view, aluminum It is preferable that the metal thin film layer 7 is made of:

When the metal thin film layer 7 is laminated, the laminated film 2
It is preferable to emboss it. This not only makes the appearance of the laminated film 2 beautiful, but also increases the flexibility of the entire laminated film 2, which has the advantage of making the cold bag 1 easier to use.

If the strength of the cold insulating material layer 4 is not sufficient, a reinforcing material layer 8 may be further laminated on the cold insulating material layer 4, as shown in FIG. Any material can be used to form the reinforcing material layer 8 as long as it can reinforce the cold insulating material layer 4 and the entire laminated film 2, but it is generally made from natural fibers or synthetic fibers. It is possible to use woven or non-woven fabrics, paper or split cloth (warif).
The cloth cloth referred to here refers to strips 10 obtained by stretching polyethylene film or polypropylene film in one direction and tearing them in the stretching direction, and arranging them in a lattice pattern vertically and horizontally, as shown in FIG. 11, but from an economical point of view, it is preferable to use split cloth.

The cold storage material 5 of the present invention is a gel body containing a liquid with high specific heat and heat of fusion, and it is thought that the liquid is retained in the polymer structure of the gel body, which is polymerized into a three-dimensional network. However, the cold storage material 5 used in the present invention is a material that is resistant to plastic deformation even if the polymer structure contains liquid. And this property is
Temperatures in a range higher than the cold storage temperature, i.e., when the substance contained in the polymer structure is liquid, and temperatures below the cold storage temperature, i.e., when the substance contained in the polymer structure is solid. No difference on both sides. Therefore, the cold storage material 5 of the present invention
has the characteristic that the shape of the gel body as a whole does not change and does not undergo plastic deformation at temperatures around the cold storage temperature. However, the cold storage material 5 of the present invention is
In a temperature range higher than the cold storage temperature, the entire gel body is elastic and has a konnyaku shape, but in a temperature range lower than the cold storage temperature, the entire gel body remains the same shape and becomes hard.

A cold storage material having such characteristics is produced, for example, by the following method.

(1) Acrylamide or methacrylamide, crosslinking monomers such as N,N-methylenebisacrylamide, N,N-dimethylenebisacrylamide, N-dimethylacrylamide or formaldehyde, and neutral salts such as potassium chloride, chloride A redox catalyst, such as ferrous sulfate, is added to an aqueous solution of sodium, ammonium chloride, calcium chloride, magnesium chloride, their nitrates or their sulfates.
or a material polymerized by adding a reducing agent such as dithionite and a peroxide such as hydrogen peroxide, benzoyl peroxide or peroxodisulfate, thereby gelling the entire material.

(2) A material obtained by adding polyacrylic acid to the above aqueous solution and polymerizing the mixture by adding a redox catalyst to the aqueous solution, thereby gelling the entire material.

(Patent Application No. 177394 of 1980, Patent Application No. 177395 of 1988, and patent application titled "Method for Manufacturing Cold Storage Material" dated December 4, 1980) These materials are being added to the above. By adjusting the type and amount of the salts added, the cold storage temperature can be adjusted to any desired temperature. Of course, if neutral salts are not used, the cold storage temperature is close to 0°C.

The cold storage material 5 of the present invention is not limited to the above-mentioned materials, but any material can be used as long as it does not undergo plastic deformation at temperatures around the cold storage temperature. can be used.

The above materials are formed into an appropriate shape during gelation, such as a lump, a plate, a wavy or curved plate, or a small particle, and are further formed into flakes or coarse pieces as necessary. Crush coarsely. These molded products can be packaged as they are or in combination with a plurality of molded products, for example, as shown in FIGS. 2 to 4, with the above-mentioned laminated film 2 to form the cold bag 1 of the present invention.

In the cold bag 1 formed as described above, the upper layer film can be contracted after enclosing the cold storage material 5 by appropriate means, if necessary. Due to this contraction, the cold storage material 5 comes into close contact with the film that encloses it, so that cooling efficiency can be improved.

Of course, the above-mentioned cold storage material 5 can also be enclosed in a vacuum, and thereby the cooling efficiency of the cold bag 1 can be similarly improved.

Furthermore, in forming the cold bag 1 of the present invention, a bag may be formed from the laminated film 2, a solution of the above-mentioned material that has not been gelled may be poured into the bag, the mouth of the bag may be sealed, and then the entire bag may be gelled. can. Since the cold storage material 5 and the laminated film 2 are in close contact with the cold storage bag 1 thus formed, its cooling efficiency is improved.

[Effect of idea]

In the cold storage bag 1 of the present invention, the cold storage material layer 4 is laminated on the laminated film 2 that covers the cold storage material 5, so that the cold storage material 5 is stored at a temperature lower than the cold storage temperature and becomes hard. Also, the entire cold bag 1 is soft to the touch and easy to use. Further, even if the cold storage temperature of the cold storage material 5 is set low, the low temperature is not easily transmitted directly to the outer surface of the cold bag 1 due to the insulation effect of the cold storage material layer 4, so cooling can be performed at a moderate low temperature. This is advantageous when the cold bag 1 of the present invention is used for the human body, for example, when used as an ice pillow, ice pack, or the like.

In the cold storage bag 1 of the present invention, the cold storage material layer 4 has a large number of holes, so when storing cold, the cold storage material 5 can be degraded through the holes.

Furthermore, when the shape of the cold storage material 5 of the present invention is in the form of small particles, granules, flakes, or coarse pieces, the entire cold storage bag 1 is soft and deformable like a pillow filled with azuki beans or buckwheat hulls. However, this state is the same when the cold storage material 5 is stored at a temperature lower than its cold storage temperature and becomes hard, so it is very easy to use. Due to these characteristics, the cold storage bag 1 of the present invention can store cold at a temperature lower than the cold storage temperature of the cold storage material 5, thereby generating latent heat corresponding to the heat of fusion of water in the hydrous gel of the cold storage material 5. can be used to greatly improve cooling capacity. Furthermore, when the cold storage material 5 of the present invention has a plate shape, the entire surface of the cold storage bag 1 is flat, but its shape will not change unless an external force is applied to it to deform it and store cold. always maintains the same shape.
Furthermore, even if the shape of the cold storage material 5 of the present invention is molded to match the shape of the object to be cooled, its shape will not change unless an external force is applied to it to deform it and store cold. , always retains the same shape. For these reasons, the cold storage material 5 of the present invention can be molded to match the shape of the object to be cooled, and as a result, its cooling capacity is greatly improved as described above.

Due to the above advantages and effects, the cold bag 1 of the present invention can be used for general cooling, but is particularly suitable for use as an ice pillow, ice bag, or cold ship.

[Brief explanation of drawings]

Figure 1 is a partially cutaway perspective view of the laminated film of the cold bag of the present invention, Figure 2 is a partially cutaway front view of the cold bag of the present invention, and Figure 3 is the cold bag of the present invention. FIG. 4 is a partially cutaway plan view of another embodiment of the cold bag of the present invention, and FIG. 5 is a partially cutaway plan view of another embodiment of the cold bag of the present invention. A vertical cross-sectional view of one example and FIG.
FIG. 3 is a plan view of an example of the material of the reinforcing material layer in the laminated film. Drawing code, 1: Cooling bag, 2: Laminated film,
3: Film, 4: Cold insulation material layer, 5: Cold storage material, 6:
hole, 7: metal thin film layer, 8: reinforcing material layer, 9: adhesive layer.

Claims (1)

[Claims for Utility Model Registration] (1) A laminated film consisting of a cold insulation material layer with many holes and a film without holes, and a cold storage material having the property of not being plastically deformed at temperatures around the cold storage temperature, and A cold storage bag characterized in that a cold storage material is covered with the above-mentioned laminated film. (2) The cold bag according to claim 1 of the utility model registration claim, characterized in that the laminated film is water-impermeable. (3) The cold bag according to claim 1 or 2, wherein the film in the laminated film is a plastic film. (4) The cold bag according to any one of claims 1 to 3 of the utility model registration claim, characterized in that the laminated film has a metal thin film layer. (5) The cold bag according to claim 4 of the utility model registration, characterized in that the laminated film having a metal thin film layer is embossed. (6) The cold bag according to any one of claims 1 to 5 of the utility model registration claim, wherein the laminated film has a reinforcing material layer. (7) The cold storage bag according to any one of claims 1 to 6 of the claims for utility model registration, characterized in that the cold storage material is in the form of small particles, granules, flakes, or coarse pieces. (8) Claim No. 1 for utility model registration, characterized in that the cold storage material is vacuum-packed in a laminated film.
The cold bag described in any of Items 7 to 7.