JP2001165389A - Insulated box body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve insulation efficiency or productivity of an insulated box body which can be used for a refrigerator, an insulation unit, a cold insulation unit, or the like. SOLUTION: A vacuum heat insulation material having a sheet core metal of an inorganic fiber assorted structure is used for an insulated box body, which is excellent to suppress deterioration with age of heat insulating efficiency and in productivity. A shape working of the core material can easily be done, the vacuum insulation material, suitable to a required heat insulation part, can easily be manufactured so as to apply to the insulated box body. Thereby the coverage of the vacuum insulation material for the insulated box body can be increased further improving the heat insulation properties of the insulated box body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat insulating box which can be used for refrigerators, heat and cold storages, vending machines and the like.

[0002]

2. Description of the Related Art In recent years, vacuum heat insulating materials having high heat insulating performance have been one of the heat insulating materials being developed mainly by home electric appliance manufacturers and heat insulating material manufacturers in order to save energy and space.

[0003] As an example of the vacuum heat insulating material, there is a core material composed of a rigid urethane foam having open cells, which is covered with a gas barrier laminate film and the inside thereof is depressurized. It has about 2.5 times the heat insulation performance compared to resin foam.

[0004] However, as the core material of the vacuum heat insulating material,
When a commonly used resin foam or powder is used, there are various problems such as poor bendability of the resin foam, generation of gas over time, and inferior processability when powder is used. .

[0005] To solve these problems, Japanese Patent Publication No.
No. 63715 describes a fiber assembly. This is to obtain a lightweight and deformable vacuum heat insulating material by using a fiber aggregate such as glass fiber, ceramic fiber, or synthetic polymer fiber as a core material of the vacuum heat insulating material.

[0006]

However, there is a problem in the prior art that the vacuum heat insulating material is not excellent in workability, or the product has not been developed and the advantages of the fiber assembly are not fully utilized.

[0007] When an organic fiber is used for the core material, gas may be generated from the core material with the passage of time, and the heat insulation performance may be deteriorated.

Further, in order to improve the heat insulating performance of the heat insulating box, a heat insulating box using a vacuum heat insulating material using a resin foam or powder as a core material has been devised. There was a problem in heat insulation performance over time or workability.

In view of the above-mentioned problems, the present invention provides a highly heat-reliable and highly workable core material by using a vacuum heat insulating material using a core material having a sheet-like inorganic fiber aggregate as a core material. An object of the present invention is to obtain a heat-insulating box having excellent heat-insulating performance and productivity.

[0010]

Means for Solving the Problems To solve the above problems, the heat insulating box of the present invention uses a vacuum heat insulating material using a sheet-like inorganic fiber aggregate as a core material.

[0011] Therefore, since the vacuum heat insulating material generates very little gas over time and is excellent in workability, it is possible to obtain a heat insulating box having excellent aging reliability and excellent productivity.
Further, since the thin sheet-like substance is used as the core material, the thickness of the heat insulating box is reduced, and the space of the heat insulating box is reduced.

Further, since a core material that can be easily shaped is used, it is possible to easily perform processing of multiple layers, notches, bends, dents, through holes, and the like.

Therefore, a vacuum heat insulating material suitable for the necessary heat insulating portion can be easily produced and applied to the heat insulating box, so that the coverage of the heat insulating box with the vacuum heat insulating material is improved and the heat insulating performance of the heat insulating box is also improved. Is what you do.

Further, since the thin sheet-shaped core material is used, a thin partition plate can be obtained even when used as a partition plate in the heat insulating box, and the space in the box can be effectively used.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION A heat insulating box of the present invention comprises a core material and a gas barrier film covering the core material inside a box body composed of an inner box and an outer box, wherein the core material is a sheet-like material. This is a heat insulating box provided with a vacuum heat insulating material, which is an inorganic fiber aggregate, and a resin foam.

The constituent material of the sheet-like inorganic fiber aggregate is not particularly limited, and may be any inorganic fiber such as glass wool, ceramic fiber, and rock wool. The material is not limited to a single material, and an organic or inorganic binder may be used to form an aggregate.

Since inorganic fibers are used, the generation of gas over time in the vacuum heat insulating material is small, and the long-term reliability of the heat insulating box using the vacuum heat insulating material is also improved.

Further, since the aggregate is formed, a step of first filling the powder in the inner bag so as to use the powder as a core material when manufacturing the vacuum heat insulating material is omitted, and the production efficiency and the working environment are reduced. Will be improved.

Further, since the core material is not scattered even when the vacuum heat insulating material is opened, the vacuum heat insulating material is not disturbed even when the heat insulating box is discarded. The heat-insulating box having the material can be discarded.

Further, since it is sheet-like, it is thin and has good flatness, so that the heat-insulating box wall can be made thin and a heat-insulating wall having excellent flatness can be obtained.

The gas barrier film covers the core material so as to provide an airtight portion therein, and is not particularly limited in material constitution. For example, the outermost layer may be a polyethylene terephthalate resin or an intermediate layer. An aluminum foil (hereinafter referred to as an AL foil), a plastic laminate film made of a high-density polyethylene resin in the innermost layer, and an ethylene-vinyl alcohol copolymer resin having a polyethylene terephthalate resin in the outermost layer and an AL vapor deposition layer in the intermediate layer ( (Trade names: EVAL, manufactured by Kuraray Co., Ltd.), and a bag in which the innermost layer is made of a plastic laminate film made of high-density polyethylene resin.

The structural features of the outer cover material are as follows: the outermost layer is for responding to impact, etc., the intermediate layer is for ensuring gas barrier properties, and the innermost layer is for sealing by heat fusion. . Therefore, all known materials can be used as long as they meet these purposes. As a further improvement, nylon resin or the like is applied to the outermost layer to improve piercing resistance, or to the intermediate layer. Ethylene-vinyl alcohol copolymer resin with AL deposition layer
Layers may be provided.

As the innermost layer to be heat-sealed, a high-density polyethylene resin is preferable from the viewpoint of sealing properties, chemical attack properties, etc. In addition, a polypropylene resin or a polyacrylonitrile resin may be used.

Further, for the purpose of dehydrating and degassing the core material,
It is also possible to perform a heat treatment before inserting the jacket material. The heating temperature at this time is desirably 100 ° C. or higher because dehydration is possible at a minimum.

In order to further improve the reliability of the vacuum heat insulating material, if necessary, a gas adsorbent such as dawsonite, hydrotalcite, metal hydroxide, or zeolite, calcium hydroxide, calcium chloride, lithium chloride may be used. It is also possible to use a moisture adsorbent such as activated carbon.

The resin foam may be, for example, rigid urethane foam, phenol foam, styrene foam, etc., but is not particularly specified.

The above-mentioned vacuum heat insulating material and resin foam are
Although it is a heat insulating box having an inner box and an outer box inside, a method of inserting a vacuum heat insulating material and a resin foam inside the heat insulating box is to form the inner box and the outer box in advance. Vacuum insulation material is placed in the space where it was made, then resin foam is injected and molded integrally, or a heat insulation board in which vacuum insulation material and resin foam are integrally molded in advance is prepared There are various methods such as sticking to an inner box or an outer box or sandwiching them between both, but this is not particularly specified.

The heat-insulating box is a box provided with a foamed heat insulating material and a vacuum heat insulating material for obtaining a heat insulating effect, such as a heat insulating box for refrigeration or freezing, and a box for cooling / heating. If it is not particularly specified, it can be used for, for example, a box or door of a refrigerator, a vending machine, a cooler box, a refrigerator car, or the like.

Further, in the heat insulating box of the present invention, a vacuum heat insulating material having a core made of at least two or more layers of sheet-like inorganic fiber aggregates is used.

Since a thin sheet-shaped core material is used, it can be used by adjusting it to a required thickness in two or more layers. Also, depending on the required shape, there are three layers,
There is no problem even if the number of layers is different even within one vacuum insulating material such as five layers.

As described above, a core material having an infinite number of patterns can be produced very simply with one type of core material, thereby improving productivity and reducing material costs.

Adhesives or the like may be used between the layers to fix the layers. However, it is better to use only a stack of sheets to suppress gas generation as much as possible or to reduce material costs and man-hours. preferable.

Further, since the layers are formed in multiple layers, the evacuation efficiency at the time of evacuation is improved, and the production efficiency is also improved.

Further, since it is a sheet-like inorganic fiber aggregate, the shape processing of the core material can be very easily performed.

For example, it is easy to form a cutout to form a core material in a shape corresponding to a required heat insulating place, and the coverage of the heat insulating box by the vacuum heat insulating material is improved.
The heat insulation performance of the heat insulation box is also improved.

Further, the bent portion can be formed to form a vacuum heat insulating material three-dimensionally conforming to the shape of the heat insulating box, thereby improving the heat insulating performance of the heat insulating box. Moreover, even if it does not have a bent part, it is also possible to use a cylindrical vacuum heat insulating material for a cylindrical heat insulating box.

Further, since there is a depression, for example, when there is a protrusion on the outer box or the inner box to which the vacuum heat insulating material is attached, a depression corresponding to the protrusion is formed in the core material. In addition, it is possible to form a vacuum heat insulating material conforming to the shape of the outer box or the inner box, and the heat insulating performance and the productivity of the heat insulating box are excellent.

Further, when the adsorbent is used, it can be stored in this depression. At this time, the protrusions due to the adsorbent on the vacuum heat insulating material plane disappear, and the vacuum heat insulating film breaks due to the protrusions.
The long-term reliability of the insulated box is also improved.

The method of forming the depression can be produced by pressing according to the shape, but is not particularly specified.

Also, by forming the projection,
For example, if there is a dent in the outer or inner box to which the vacuum heat insulating material is attached, by forming a projection corresponding to this dent on the core material, the vacuum heat insulating material conforms to the shape of the outer or inner box. It becomes possible to achieve excellent heat insulation performance and productivity of the heat insulation box.

As a method of forming the protrusion, a sheet is laminated only at that portion, a place other than the protrusion is pressed,
There is a method of disposing a core material other than the sheet on the sheet, but this is not particularly specified.

Further, since the through hole is provided, the film covering the through hole is heat-welded, and screws and the like are passed through the heat-sealed film to fix the vacuum heat insulating material to the heat insulating box. It is also possible.

Further, according to the present invention, a thermoplastic resin or a laminate film having a thermoplastic resin on the outermost surface is attached to an inner surface of an outer box or an inner box, and a sheet-like sheet is formed on the same surface as the surface to which the thermoplastic resin is attached. A heat-insulating box comprising a gas-barrier film provided with an inorganic fiber aggregate and covering the sheet-like inorganic fiber aggregate, wherein the thermoplastic resin and the gas-barrier film are heat-welded.

Therefore, a vacuum heat insulating material is integrally molded on the inner surface of the outer box or the inner box, and then the space formed by the outer box and the inner box is filled with a resin foam, so that a heat insulating material excellent in productivity can be obtained. You can get a box.

Further, since the sheet-like inorganic fiber aggregate is used, the flatness of the core material is good, and the adhesion to the surface of the outer box or the inner box is good, so that the heat insulating performance of the heat insulating box is improved. I do.

Further, by applying a vacuum heat insulating material using the sheet-like inorganic fiber aggregate to the partition plate of the heat insulating box, a thin and lightweight partition plate having excellent heat insulating performance can be obtained. Effective use of space is also possible.

The partition plate of the heat-insulating box can be used as a partition plate between rooms in a refrigerator, a hot / cold threshold of a vending machine, and the like, but is not particularly specified other than the above.

In addition to providing only the vacuum heat insulating material inside the partition plate, a partition using at least a sheet-like inorganic fiber aggregate such as a partition plate having a resin foam and a vacuum heat insulating material. Any plate may be used.

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

(Embodiment 1) FIG. 1 is a sectional view of a heat insulating box according to an embodiment of the present invention. 1 is a heat insulating box forming a refrigerator, and 2 is a vacuum heat insulating material. Insulated box 1 is A
A vacuum heat insulating material 2 is disposed in advance in a box formed by a flange 5 and an inner case 3 formed by vacuum-molding a BS resin and an outer case 4 formed by pressing an iron plate. Is obtained by foam-filling a rigid urethane foam 6.

FIG. 2 is a schematic view of the heat insulating box 1, in which one vacuum heat insulating material 2 is provided on the top, one on the back, and two on the side of the heat insulating box.
Are arranged. The vacuum heat insulating material 2 used for the side surface has one side cut to match the shape of the side wall according to the shape of the heat insulating box 1.

FIG. 3 is a cross-sectional view of the vacuum heat insulating material 2 in the present embodiment, in which 7 is a sheet-like glass wool aggregate, and 8 is a jacket material.

The vacuum heat insulating material 2 is obtained by drying a sheet-like glass wool aggregate 7 having a thickness of 5 mm at 130 ° C. for 1 hour, inserting the same into the outer cover material 8, and evacuating the inside to seal the opening. Is formed.

The outer cover material 8 has, on one side, a polyethylene terephthalate (12 μm) as a surface protective layer, an aluminum foil (6 μm) at an intermediate portion, a laminated film having a heat seal layer made of high-density polyethylene (50 μm), and the other. The surface protective layer is made of polyethylene terephthalate (1
2 μm), the middle part is a film layer in which aluminum is deposited on the inside of the ethylene-vinyl alcohol copolymer resin composition (15 μm), and the heat sealing layer is a laminated film made of high density polyethylene (50 μm).

Further, a nylon resin layer is formed on the surface material of the outer cover material 8 in order to improve the scratch resistance.

The performance of the vacuum heat insulating material having the above configuration is as follows.
It was 0.0043 W / mK at 30 Pa.

Therefore, since the vacuum heat insulating material 2 having a small thickness and good heat insulating performance is used, the heat insulating box 1 to which the vacuum heat insulating material is applied can be made thinner, thereby saving the space of the refrigerator or increasing the internal volume of the refrigerator. .

Further, since the core material is in the form of a sheet, it is easy to cut the core material. A sheet having a shape conforming to the side wall is prepared, and preferably, the sheet is inserted into a jacket material conforming to the shape to vacuum heat insulation. By using the material, the covering rate of the heat-insulating box body is improved and the heat-insulating performance is improved, so that energy saving becomes possible and an eco-friendly refrigerator is obtained.

Further, since the inorganic fibers are flame retardant,
Vacuum insulation also has a structure that is difficult to burn and hardly generates harmful gas. Therefore, the refrigerator using the vacuum heat insulating material is also excellent in safety, for example, it is hard to burn.

Further, even when a flammable substance such as a hydrocarbon is used in a refrigerator as a foaming agent for a resin foam, a refrigerant, or the like, since the inorganic fibers are used, a structure in which the vacuum heat insulating material is difficult to burn is used. Therefore, a refrigerator with extremely high safety can be obtained.

(Embodiment 2) FIG. 4 is a schematic view of a heat insulating box according to an embodiment of the present invention.

The heat insulating box 9 is used as a cooler box, and includes a box 10 and a lid 11.

FIG. 5 is a schematic view of a box portion in one embodiment of the present embodiment.

The box 10 is formed by attaching the vacuum heat insulating material 2 to the inner surface of the inner box with double-sided tape in the space formed by the inner box 12 and the outer box 13 made of polypropylene. The space inside the space formed by the above and in which the vacuum heat insulating material 2 is not provided is integrally molded by foam filling with a hard urethane foam 6.

FIG. 6 is a schematic view of the lid according to an embodiment of the present invention.

After the vacuum heat insulating material 2 having the adsorbent 15 is disposed in the expanded polystyrene 14, it is filled in the space formed by the inner frame 14 and the outer frame 15.

In FIG. 5, the vacuum heat insulating material 2 has a thickness of 5 m.
m in the form of a glass wool aggregate 7 in a multi-layered form.
The pieces of vacuum insulation are bent in a U-shape.

Since the vacuum heat insulating material 2 is a sheet-like core material, it can be easily bent into a U-shape.

Accordingly, the coverage of the heat insulating box 9 with the vacuum heat insulating material 2 is improved, and the heat insulating performance of the heat insulating box is improved.

In FIG. 6, a lid portion 11 is made of a foamed polystyrene 16 having a hollow formed in advance in accordance with the shape of the vacuum heat insulating material inside a space formed by an inner frame 14 and an outer frame 15 made of polypropylene, and fitted into the hollow. And a vacuum heat insulating material 2 which is provided.

The vacuum heat insulating material 2 used for the lid 11
Is smaller than the vacuum heat insulating material used for the box portion 10, so that the ratio of the area of the seal portion of the outer cover material increases. Therefore, it is conceivable that the influence of the gas which invades from the sealing portion of the jacket material with the passage of time is great, the performance of the vacuum heat insulating material deteriorates with time, and the heat insulating performance of the lid portion 11 deteriorates.

Therefore, the adsorbent 17 is used for the lid 11.

As for the production of the vacuum heat insulating material in which the adsorbent 17 is inserted, in order to maintain the flatness of the vacuum heat insulating material, the sheet-shaped glass wool aggregate 7 is provided with a recess corresponding to the adsorbent 17.
It was formed in advance by a press machine. Thereafter, the adsorbent 17 is disposed in the depression of the sheet-like glass wool aggregate 7,
A vacuum heat insulating material was produced by inserting into a jacket material and evacuating the inside and sealing the opening.

Here, the adsorbent is desirably composed of a getter substance of a normal temperature type which adsorbs and removes at least nitrogen, oxygen, moisture and carbon dioxide.

(Embodiment 3) FIG. 7 is a cross-sectional view of a heat insulating box according to the present embodiment.

Reference numeral 18 denotes a heat insulating box forming a refrigerator.
The heat-insulating box 18 includes an inner box 3 formed by vacuum-molding an ABS resin and an outer box 4 formed by pressing an iron plate. The vacuum heat-insulating material 2 is disposed inside a box formed by the inner box 3 and the outer box 4. The space other than the vacuum heat insulating material is filled with rigid urethane foam 6 by foaming.

The inner surface of the outer box 4 is previously coated with a thermoplastic resin 17 having a width of 10 mm along the outer periphery of the core 2.

At this time, the thermoplastic resin is one that is heat-sealed to the heat sealing layer of the jacket material 8, and is preferably high-density polyethylene, low-density polyethylene, polypropylene, or the like.

Thereafter, the sheet-like glass wool aggregate 7 having a square shape is disposed on the inner surface of the outer box 4, and three sides of the outer cover material 8 are thermally fused with the thermoplastic resin 17. The vacuum heat insulating material 2 can be obtained by vacuum-evacuating and heat-sealing the remaining one side.

In this case, since the sheet-like glass wool aggregate 7 which is lightweight, has excellent flatness and is thin is used as the core material, the adhesion to the inner surface of the outer box is improved, so that the heat insulating performance is improved. I do. Further, since it is lightweight and thin, it does not shift under its own weight even when attached to the inner surface of the outer box.

Further, after the vacuum heat insulating material is used, even when rigid urethane foam is foam-filled inside the space formed by the inner box 3 and the outer box 4, the fluidity of the foam is hindered due to the thin core material. Nothing to do. Therefore, since the rigid urethane foam is uniformly filled without voids, the heat insulating performance of the heat insulating box is improved.

[0082]

As described above, the heat insulating box of the present invention uses a vacuum heat insulating material using a sheet-like inorganic fiber aggregate as a core material.

Therefore, the vacuum heat insulating material generates very little gas over time and is excellent in workability, so that a heat insulating box excellent in reliability over time and excellent in productivity can be obtained.
Further, since the thin sheet-like substance is used as the core material, the thickness of the heat insulating box is reduced, and the space of the heat insulating box is reduced.

Further, since a core material which can be easily shaped is used, it is possible to easily form a multi-layer or cut, bend, dent, through hole, or the like.

Accordingly, since a vacuum heat insulating material suitable for the necessary heat insulating portion can be easily produced and applied to the heat insulating box, the coverage of the heat insulating box with the vacuum heat insulating material is improved, and the heat insulating performance of the heat insulating box is also improved. Is what you do.

Further, since a thin sheet-shaped core material is used, a thin partition plate can be obtained even when used as a partition plate in a heat insulating box, and the space in the box can be effectively used.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a heat insulating box according to an embodiment of the present invention.

FIG. 2 is a schematic view of a heat insulating box in one embodiment of the present invention.

FIG. 3 is a sectional view of a vacuum heat insulating material according to an embodiment of the present invention.

FIG. 4 is a schematic view of a heat insulating box in one embodiment of the present invention.

FIG. 5 is a schematic view of a box portion in one embodiment of the present invention.

FIG. 6 is a schematic view of a lid according to an embodiment of the present invention.

FIG. 7 is a cross-sectional view of the heat insulating box in one embodiment of the present invention.

[Explanation of symbols]

 1, 9, 18 Insulating box 2 Vacuum insulating material 3, 12 Inner box 4, 13 Outer box 5 Flange 6 Hard urethane foam 7 Sheet glass wool aggregate 8 Outer covering material 10 Box 11 Lid 14 Inner frame 15 Outer frame 16 Expanded polystyrene 17 Adsorbent 19 Thermoplastic resin

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3E067 FB11 FC01 GA13 GA14 3H036 AA08 AA09 AB13 AB14 AB15 AB24 AB25 AB28 AC01 AC06 AD09 AE02

Claims (9)

[Claims] Claims: 1. An inner box comprising an inner box and an outer box,
A vacuum heat insulating material comprising a core material and a gas barrier film covering the core material, wherein the core material is a sheet-like inorganic fiber aggregate,
A heat insulating box provided with a resin foam. 2. Inside a box composed of an inner box and an outer box,
A heat insulating box body provided with a vacuum heat insulating material and a resin foam, wherein the heat insulating material comprises a core material and a gas barrier film covering the core material, and the core material comprises at least two or more layers of sheet-like inorganic fiber aggregates. . 3. The heat insulating box according to claim 1, wherein a cutout portion is formed on at least one side of the sheet-like inorganic fiber aggregate. 4. The heat insulating box according to claim 1, wherein at least one side of the sheet-like inorganic fiber aggregate is bent. 5. The heat-insulating box according to claim 1, wherein the sheet-like inorganic fiber aggregate has a depression in at least one place. 6. A sheet-like inorganic fiber aggregate having a projection at at least one position.
A heat-insulating box according to any one of the preceding claims. 7. A sheet-like inorganic fiber aggregate having a through hole in at least one place.
A heat-insulating box according to any one of the preceding claims. 8. A thermoplastic resin or a laminate film having a thermoplastic resin on the outermost surface is attached to the inner surface of the outer or inner box, and the sheet-like inorganic fiber aggregate is formed on the same surface as the surface on which the thermoplastic resin is attached. And a gas barrier film covering the sheet-like inorganic fiber aggregate, wherein the thermoplastic resin and the gas barrier film are heat-welded to each other. An insulated box according to claim 1. 9. A heat insulating box body having a partition plate, and the partition plate having at least a vacuum heat insulating material made of a core material made of a sheet-like inorganic fiber aggregate and a gas barrier film. .