JP3170261B2 - Ventilation hole sealing structure of double wall heat insulating container and sealing method thereof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to sealing a ventilation hole in a space between double walls forming a heat insulating layer of a double wall heat insulating container used for a thermos, a vacuum heat insulating cooker, a large heat insulating container and the like. And a sealing method.

[0002]

2. Description of the Related Art Generally, in a vacuum heat insulating container made of metal, an inner container and an outer container are integrally joined via a space portion, and this space portion serves as a vacuum heat insulating layer. As the vacuum sealing structure, for example, a structure is known in which a vent is provided in any part such as the bottom of an outer container, and the vent is sealed with a brazing material. When manufacturing this kind of metal vacuum insulated container, after the inner container and the outer container are integrated, a brazing material for sealing the air hole is arranged so as to cover the vicinity of or part of the air hole. Then, this is housed in a vacuum heating furnace and subjected to the following processing. That is, at the same time as the evacuation in the vacuum heating furnace, heating is first performed at a temperature not higher than the temperature at which the brazing material is melted, and after the gas component adsorbed by the container material is degassed and removed, then at a temperature at which the brazing material is melted. By raising the temperature, the brazing material is melted and poured into the ventilation holes, the temperature is reduced while the brazing material covers the ventilation holes, and the brazing material is solidified,
A metal vacuum insulated container with a closed vent is formed.

[0003] However, in the case of the above-mentioned metal vacuum insulated container, vacuum equipment is necessary for the production, and the investment for production is large, because the entire vacuum furnace is heated to remove the gas components of the adsorbed gas. There is a problem in the manufacturing process that it takes a long time. Further, since the heat insulating layer is in a vacuum, the inner container and the outer container are always subjected to the atmospheric pressure load, and the inner and outer containers need to have a strength capable of withstanding the atmospheric pressure.

Japanese Patent Application Laid-Open No. 11-137451 discloses that
A structure of a vent sealing portion of a large-diameter vacuum heat insulating container having a large diameter is disclosed. In the case of such a large-diameter metal vacuum insulation container having a large diameter, if it falls, the impact is large, and cracks and the like occur in the brazing material sealing the heat insulation layer, and the vacuum cannot be maintained. For this reason, a structure has been proposed in which a viscous adhesive is disposed so as to cover the brazing material, and further covered with a protective member. Further, since the viscous adhesive has a low curing speed, there is a possibility that the protective member may shift before being cured, so the protective member and the outer container are fixed with an instant adhesive.

In addition, a heat insulating container made of synthetic resin is disclosed in Japanese Patent Application Laid-Open No. Hei 8-224178 separately from a vacuum heat insulating container made of metal. In this heat insulating container made of synthetic resin, an inner container and an outer container are integrally joined via a space, and a low heat conductivity gas having a lower heat conductivity than air is sealed in this space to form a heat insulating layer. . As the sealing structure, for example, a structure is known in which a vent is provided in any part such as the bottom of an outer container, and the vent is sealed with a sealing material. When manufacturing this kind of synthetic resin insulation container, after integrating the inner container and the outer container, the space between the inner container and the outer container is evacuated, and then the low thermal conductivity gas is discharged. It was introduced to about atmospheric pressure, sealed with a cyanoacrylate-based adhesive, and further provided with a protective material for protecting the air hole sealing portion.

However, in these synthetic resin insulation containers, when the containers are washed after use, they may be washed at a high temperature or dried at a high temperature after the washing. On this occasion,
Various cleaning agents such as alkaline cleaning agents are used.
It was sometimes exposed to a high temperature of 0 degrees or more. However, the cyanoacrylate-based adhesive used for sealing the synthetic resin heat-insulating container is inferior in chemical resistance and heat resistance,
There is a problem that the airtightness deteriorates in the washing and drying steps, the low thermal conductivity gas filled in the heat insulating layer leaks, and the performance as a heat insulating container deteriorates. Further, at the time of washing or the like, there is a problem that water penetrates into the space through the ventilation hole sealing portion, and becomes heavy or causes odor.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional disadvantages and problems, and has been developed in a double-wall insulated container using an adhesive as a sealing material. Even if exposed, the ventilation hole sealing portion does not deteriorate, the workability is further improved, the ventilation hole is securely sealed, and the ventilation hole sealing portion of the double-walled heat insulating container is securely sealed and protected in a short time. An object of the present invention is to provide a structure and a method for sealing the same, thereby reducing the defect rate and reducing the cost.

[0008]

Means for Solving the Problems In order to solve the above-mentioned conventional problems and to solve the problems, the present invention employs the following means. Invention, the inner container and the outer according to claim 1
The container and the container are integrally joined via a space, and the space is low.
It consists of a heat insulating layer with a heat insulating medium such as sealing a thermal conductivity gas.
A double-wall insulated container, wherein an insulating medium is disposed in the space.
Provided in one of the inner container and the outer container for
The vent hole is sealed with an adhesive sealing material and a sealing plate.
Make sure that the stop plate is covered with a protective member via an elastic adhesive.
The double-walled heat-insulated container has a vent hole sealing structure.
It is a thing.

[0009] The invention according to claim 2 provides an inner container and an outer container.
The double-walled container in which the vessel is integrated with the space separated therefrom.
Ventilation provided in either the inner container or the outer container in the space
After arranging the heat insulating medium through the hole, attach the adhesive sealing material to the air hole.
Disposing a sealing plate to seal the ventilation hole, and then
Specially, the sealing plate is covered with a protective member via an elastic adhesive.
The method of sealing the air hole sealing part of the double wall insulated container
It is a thing.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The double-walled heat-insulating container of the present invention comprises an inner container which comes into contact with the stored food when the food or the like is stored, and an outer container which is exposed to the atmosphere. This is a double-walled heat-insulated container that is arranged in an outer container with a space portion interposed therebetween and integrated with the space portion interposed. And the inner container, one of the outer container is provided with a vent, and in a state where a heat insulating medium is arranged in a space interposed between the inner and outer containers, the vent is sealed using an adhesive as an adhesive sealing material, The ventilation hole is provided with an elastic adhesive.

[0011] The heat insulating medium interposed in the space between the inner and outer containers may be filled with a low thermal conductivity gas having a lower thermal conductivity than air composed of at least one of krypton, xenon, argon, or the like. In addition, a porous solid heat insulating material such as urethane foam is provided. The material of the inner and outer containers may be any material that does not deform when exposed to high temperatures such as during washing and drying. For example, metals such as stainless steel and high-temperature materials such as polyketone, polyarylate, polysulfone, and polyethersulfone. An engineering plastic or the like that can endure is suitable.

Examples of the elastic adhesive of the present invention include a one-pack or two-pack type epoxy-based reactive resin-based adhesive and a silyl group-containing special polymer-based adhesive. There are Super X (trade name) manufactured by Cemedine Co., Ltd. and Silex 100 (trade name) manufactured by Konishi Co., Ltd. These are adhesives that cure by absorbing moisture in the air, become elastic and sticky in about 10 minutes after application, and cure, and when cured, have extremely low gas permeability. It has the property that the heat-resistant temperature is 120 degrees or more in the state. The elastic adhesive of the present invention is disclosed in
An adhesive including the viscous adhesive disclosed in 1-1137451.

[0013] Examples of the adhesive sealing material include a cyanoacrylate-based instant adhesive and the like.
Instant adhesive 3000RX (trade name) manufactured by Cemedine Co., Ltd., Aron Alpha (trade name) manufactured by Toagosei Co., Ltd.
There is. These are capable of instantly bonding and solidifying the bonded objects. Further, as another instant adhesive, a hot melt adhesive mainly containing a thermoplastic polymer such as polyolefin or polyamide can be used. However, the adhesive sealing material may be appropriately selected depending on the heat-insulating medium. When a low-thermal-conductivity gas is used as the heat-insulating medium, an instant adhesive is preferable in order to prevent replacement of the low-heat-conductivity gas with air. On the other hand, when the heat-insulating medium is air or solid heat-insulating material, there is no problem such as replacement even after a lapse of time. If so, a general adhesive may be used. However, in view of the fact that the next step can be performed immediately in the manufacturing process, an instant adhesive is preferable.

With the above-described structure of the ventilation hole sealing portion, the outer surface of the ventilation hole is sealed with an adhesive sealing material, and the ventilation hole is covered with an elastic adhesive to be protected. Therefore, the impact resistance is improved, and the elastic adhesive absorbs the impact even if dropped, and the sealing portion of the vent hole is not broken. Also, even if the sealing material is exposed to a high temperature during washing and drying, the sealing portion of the adhesive sealing material is covered with the elastic adhesive, especially since the elastic adhesive has a heat insulating function. Can be protected from

Further, since the elastic adhesive has a gas barrier property, when a low thermal conductivity gas is used as the heat insulating medium, the elastic adhesive has a gas barrier property in addition to the sealing thickness of the adhesive sealing material having the gas barrier property. The thickness of the elastic adhesive is added to have a more excellent gas barrier function. In particular, when the inner and outer containers are made of metal, the only place where there is a risk of gas permeation is this vent hole, and the effect of dealing with this is enormous. In addition, the strength of the sealing portion of the heat insulating container can be further increased by using a plate-like protection member and disposing an elastic adhesive between the adhesive sealing material and the protection member. Furthermore, in sealing the ventilation hole, by disposing an adhesive sealing material and a sealing plate so as to cover the ventilation hole, and by disposing an elastic adhesive between the sealing plate and the protection member,
Further, the strength can be increased. The structure of these sealing portions may be appropriately selected from the state of use of the heat insulating container, the sealing strength and the heat resistance temperature required according to the environment.

Hereinafter, an embodiment of the structure of the ventilation hole sealing portion of the double-walled heat insulating container of the present invention will be described with reference to the drawings. FIG. 1 is a partially cut-away sectional view of a double-walled heat insulating container 1 made of metal. The metal double-wall insulated container 1 includes, for example, an inner container 2 made of stainless steel and an outer container 3 made of stainless steel. The inner container 2 is arranged inside the outer container 3 with a space 4 therebetween, and the open end 2a of the inner container 2 and the open end 3a of the outer container 3 are airtightly connected to each other to be integrated and doubled. Forming a wall container. In the space portion 4 of such a double-walled container, a double-walled heat-insulating container provided with a heat-insulating layer 5 provided with a heat-insulating medium Z, such as a low-thermal-conductivity gas-filled state and a foamed heat-insulating material. 1 are formed.

In such a double-walled heat-insulating container 1, a small recess 6 is provided at the center of the bottom 3 b of the outer container 3, and is recessed toward the heat-insulating layer 5. Pores 7
It has a structure with a hole. In the bottom 3b of the outer container 3, three recesses such as a concentric sealing plate recess 8 and a larger concentric protection member recess 9 are formed along the periphery of the small recess 6 substantially at the center. ing. The sealing plate recess 8
The depth of the protection member recess 9 is approximately the same as the thickness of the sealing plate 10 and the protection member 11 that are disposed and fixed in the sealing plate recess 8 and the protection member recess 9, respectively. In addition, at least the sealing plate 10 and the protective member 11 can be easily positioned, and furthermore, after the positioning and arrangement, a depth that does not cause displacement is required. An adhesive sealing material 12 is hermetically packed and fixed in the air hole 7, and the protective member 11 is disposed on the outer surface thereof through an elastic adhesive 13. The protective member is fitted and fixed in the concave portion 9 so as to be flush with the surface 3b. By making the outer diameters of the sealing plate 10 and the protection member 11 substantially the same, the sealing plate recess 8 and the protection member recess 9 are formed.
In this case, the formation of the two-step concave portion can be completed.

As the protective member 11, a stainless steel plate was used. In the case of the metal double-walled heat-insulating container 1, the protective member 11 is adhered to the outer container 3, and even if the bottom 3b becomes wet, the outer container 3 and the protective member 1 are bonded.
It is preferable that the material is the same as that of the outer container so that corrosion does not occur between the outer container and the outer container. Considering the use environment, heat resistance,
If there is no problem in corrosiveness, only the protective member 11 may be made of a synthetic resin which is excellent in ease of molding and cost.

The sealing of the ventilation holes 7 of the double-walled heat-insulating container 1 having the above-described structure is performed according to the following steps, for example, when a low thermal conductivity gas is sealed as a heat-insulating medium. First, the inner container 2 is disposed in the outer container 3 with the space 4 therebetween, and the open end 2a of the inner container 2 and the outer container 3 are respectively disposed.
And an open end 3a thereof are hermetically connected and integrated by means of welding, welding or the like to form a double-walled container. Next, the space 4 between the outer container 3 and the inner container 2 is evacuated through a vent hole 7 by a vacuum pump (not shown) and evacuated to a predetermined pressure. A heat insulating medium Z such as a low thermal conductivity gas is filled. After the filling, the vent holes 7 are formed with an adhesive sealing material 12 such as a cyanoacrylate instant adhesive and a sealing plate 10.
Is sealed. At this time, between the ventilation hole 7 and the sealing plate 10,
It is desirable that the space be filled with the adhesive sealing material 12 without forming a space such as a bubble. This makes it possible to manufacture a metal double-walled heat insulating container in which a low thermal conductivity gas is sealed as a heat insulating medium Z in the space between the inner container 2 and the outer container 3.

Next, in order to impart heat resistance and gas barrier properties to the ventilation holes 7 and further protect the ventilation holes 7, the protective member 1 is provided on the outer surface of the sealing plate 10 via an elastic adhesive 13.
1 and is fitted and fixed in the protective member recess 9 so that the outer surface thereof is flush with the surface of the bottom 3 b of the outer container 3.

The sealing and fixing operation is performed in the following manner. First, in order to perform these sealing and bonding firmly, the joining surfaces of the sealing plate 10, the small concave portion 6, the protective member concave portion 9, the protective member 11, and the like are degreased and cleaned in advance using alcohol. preferable. Next, after the air holes 7 are sealed with an adhesive sealing material 12 and a sealing plate 10 made of an instant adhesive, Super X (manufactured by Semendyne Co., Ltd.) is formed on the outer surface side of the sealing plate 10 as an elastic adhesive 13. (Product name) is applied. Then, the protection member 11 is arranged and fixed in the protection member recess 9. Thus, about 10 minutes after the sealing and fixing operation, Super X, which is an elastic adhesive, fixed the protective member 11 at a predetermined position and was cured.

According to the above-described sealing portion structure of the present invention, the sealing portion is protected by the elastic adhesive 13 and the protection member 11, and the top surface of the protection member 11 and the surface of the bottom 3b of the outer container 3 are substantially formed. Since they are flush with each other on the same plane, the appearance is good, the alignment can be easily performed without using a jig or the like, and the workability can be improved. Furthermore, even if a lateral force is applied, since the protection member 11 is disposed in the protection member recess 9, the protection member 11 is difficult to move and is surely protected without separating. Has the advantage of gaining.

Further, even if an external force acts on the protective member 11 after the elastic adhesive 13 such as Super X is cured, the elastic adhesive 13 such as Super X retains elasticity even after being cured. Therefore, the external force is not transmitted to the adhesive sealing material 12 and the sealing portion of the ventilation hole 7 can be protected firmly. Further, even if the metal double-walled heat insulating container is exposed to a high temperature by washing and drying, since the protective member 11 and the elastic adhesive 13 have the function of a heat insulating material, the heat influence on the ventilation hole 7 is reduced. can do. Further, since the elastic adhesive 13 has a gas barrier property, it is possible to prevent the low thermal conductivity gas from permeating from the air hole sealing portion, and to remove the low thermal conductivity gas sealed in the space portion 4 well. Can be maintained in a state.

As mentioned above, an example of the structure of the air hole sealing portion of the double-walled heat insulating container of the present invention has been described with reference to FIG. 1, but the structure of the air hole sealing portion of the present invention is not limited to this. 2, the protective member 11 and the sealing plate 10 are omitted, and the air holes 7 are sealed with an adhesive sealing material 12, and then bonded as shown in a cutaway sectional view of a main part of the air hole sealing portion structure shown in FIG. The second embodiment in which the sealing material 12 is covered with only the elastic adhesive 13 may be used, and the same operation and effect can be obtained. Further, in the second embodiment shown in FIG. 2, the sealing plate 10 is used together with the adhesive sealing material 12 to seal the air holes 7, and the structure is covered with an elastic adhesive 13 thereon. Good.

Further, as shown in the cutaway sectional view of the main part of the structure of the sealing portion of the air hole shown in FIG. 3, the air hole 7 is sealed with an adhesive sealing material 12 and an elastic adhesive 13 is placed thereon. Of course, the third embodiment in which the protective member 11 is arranged by the protective member 11 has the same effect. These sealing structures may be appropriately selected and adopted in consideration of the state of use of the heat insulating container, heat resistance required according to the environment, impact resistance, and the like. In the above-described embodiment, the metal double-walled heat insulating container is described as an example. However, the present invention is not limited to this, and any material such as a synthetic resin material may be used as long as the double-walled heat insulating container is used. It is needless to say that the present invention can be applied to the above-mentioned container, and the same effect can be obtained.

[0026]

EXAMPLE As an example, a metal double-walled heat insulating container 1 having a ventilation hole sealing portion structure as shown in FIG. 1 was manufactured. The specifications of each component are as follows. ● Inner container 2: SUS304 stainless steel, wall thickness 0.7
mm, outer diameter 180mm, height 240mm. ● Outer container 3: SUS304 stainless steel, wall thickness 0.8
mm, outer diameter 200mm, height 250mm. ● Small recess 6: about 10 mm inner diameter, about 5 mm depth, substantially conical shape. ● Vent 7: about 2 mm in diameter. ● Sealing plate recess 8: about 18 mm in inner diameter, about 1.5 mm in depth. ● Sealing plate 10: SUS304 stainless steel, wall thickness 0.
5 mm, outer diameter 17 mm. ● Protective member recess 9: about 25 mm inside diameter, about 1.5 m depth
m. ● Protective member 11: SUS304 stainless steel, wall thickness 0.5 mm, outer diameter 24 mm. ● Insulating medium Z: Krypton gas.

Then, each open end 2 of the inner container 2 and the outer container 3
a and 3a are welded and integrated by TIG welding, and then the inner container 2 and the space 4 of the outer container 3 are depressurized by a vacuum pump through the ventilation holes 7, and then krypton gas is used as a heat insulating medium Z at room temperature and approximately atmospheric pressure. And enclosed. After that, several drops of an instant adhesive Aron Alpha (trade name, manufactured by Toa Gosei Co., Ltd.) are dropped into the ventilation hole 7 as an adhesive sealing material 12 and sealed together with the sealing plate 10 to obtain a metal double-wall heat insulating container 1. .

Next, a gel-like Silex 100 (trade name, manufactured by Konishi Co., Ltd.) as an elastic adhesive 13 is applied to the surface of the sealing plate 10 and the protection member recess 9, and the protection member 11 is placed in the protection member recess 9. On the outer surface of the elastic adhesive 13 and pressed. The elastic adhesive 13 was pushed and spread by the protection member 11 and uniformly extended between the bottom surface of the protection member recess 9 and the protection member 11, and the protection member 11 was fixed in the protection member recess 9. Then, after about 10 minutes, the elastic adhesive 13 was hardened, and the ventilation hole sealing portion could be easily and strongly protected by the elastic adhesive 13.

[Comparative Example] For comparison, a double-walled heat insulating container having the same material and the same specifications as the above-mentioned embodiment was omitted without using the elastic adhesive 13 and the protective member 11. Then, the air holes 7 were manufactured to have a conventional air hole sealing portion structure in which the air holes 7 were sealed only with the adhesive sealing material 12 of the instant adhesive.

[Performance Comparison Test] Next, in order to confirm the performance of the vent hole sealing portion structure of the present invention, a comparison was made with the double wall insulated container having the vent hole sealing portion structure of the present invention manufactured in the above embodiment. Each of the conventional double-walled heat-insulated containers having the ventilation hole sealing structure manufactured in the example was housed in a thermostat at 130 ° C.
It was left for 00 hours, and the heat resistance of the adhesive sealing material 12 was inspected. As a result, in the double-walled heat-insulating container having the ventilation hole sealing portion structure of the present invention as in the embodiment, no problem such as thermal deterioration was observed in the adhesive sealing material 12, and before the heat-resistant test was performed as the heat-insulating container. It was confirmed that the same heat retention performance was maintained. In the double-walled heat-insulating container of the comparative example having a ventilation hole sealing structure in which the elastic adhesive 13 and the protective member 11 are not provided, the adhesive sealing material is discolored to brown due to heat and the bonding strength is reduced. As a result, the airtightness was destroyed, and the heat retention performance of the heat insulating container was significantly deteriorated.

In the above embodiment, the size of the vent hole 7 is set to the diameter 2
However, the size of the ventilation hole 7 is not limited to the circular shape having a diameter of 2 mm used in the embodiment, and the shape may be a non-circular shape such as an elliptical shape or a slit shape. Needless to say, the diameter may be large as long as it can be sealed with an adhesive. Further, the number of the ventilation holes 7 may be plural depending on the volume of the space. Matazu first of 1
By using the sealing plate 10 as in the embodiment, the opening area of the ventilation hole can be increased, and in this case, the exhaust efficiency can be improved.

Further, in the above embodiment, the metal double-walled heat insulating container has been described as an example. However, the structure of the air hole sealing portion is not limited to this. If it is, it is needless to say that the present invention can be applied to a container made of any material such as a synthetic resin material, and the same effect can be obtained. Also,
In the above-described embodiment, the state in which the low thermal conductivity gas is sealed is described as an example of the heat insulating medium Z disposed in the space portion 4 for forming the heat insulating layer 5. The present invention is not limited to this, and can be applied to any arrangement state such as loading of a foaming material as long as the heat insulation medium Z is arranged in the space portion 4 of the double wall. Of course, it produces an effect.

[0033]

The present invention is implemented in the above-described embodiment, and has the following effects. That is, according to the present invention,
After sealing the ventilation holes of the heat insulating container with an adhesive sealing material and a sealing plate ,
Apply an elastic adhesive so as to cover the sealing plate , and then spread the elastic adhesive between the protection member and the protection member recess,
It can be adhered with elasticity, and even after the elastic adhesive is cured, even if external force acts on the protective member or solidifies, even if it is solidified, it can be used as an adhesive sealing material due to the elasticity of the elastic adhesive. External force is not transmitted, and the ventilation hole sealing portion can be firmly protected.

Even if this double-walled heat insulating container is exposed to a high temperature by washing and drying, the protective member and the elastic adhesive have the function of a heat insulating material, so that the adhesive sealing material for sealing the vent hole is used. Even if the heat resistance is low, the influence on the ventilation holes can be reduced. Furthermore, since the elastic adhesive has gas barrier properties, it is possible to prevent low thermal conductivity gas from permeating from the air hole sealing part, and maintain the low thermal conductivity gas sealed in the space in a good state can do.

Further, when the protection member concave portion is formed in the flat portion, even if the protection member is fixed, the portion has a substantially flat surface, so that the appearance is good, and the protection member is parallel to the protection member (lateral direction). External forces are less likely to act. Further, even when an external force acts on the protective member from a direction perpendicular to the protective member, the adhesive sealing material can be protected by the elastic adhesive having elasticity with the protective member. In addition, by using an elastic adhesive having environmental resistance such as chemical resistance, it is possible to provide a vent sealing structure excellent in external force and environmental resistance.

Even when the elastic adhesive has not been cured yet, since the protective member covers the elastic adhesive, there is no need to wait until the adhesive is cured. It can be shortened and the manufacturing price can be reduced. Furthermore, even when exposed to a high temperature, the elastic adhesive has high heat resistance, so that the high temperature does not particularly affect the air hole sealing portion, and the like. It works.

[Brief description of the drawings]

FIG. 1 is a partially cutaway cross-sectional view of a double-walled heat-insulating container illustrating a structure of a ventilation hole sealing portion of the present invention.

FIG. 2 is a cutaway sectional view of a main part of a ventilation hole sealing portion structure for explaining a second embodiment.

FIG. 3 is an essential part cut-away sectional view of a ventilation hole sealing part structure for explaining a third embodiment.

[Explanation of symbols] 1 ... double wall insulated container, 2 ... inner container, 3 ... outer container,
4 space part, 5 heat insulation layer, 6 small recess, 7 vent hole, 8 sealing plate recess, 9 protection component recess, 10 sealing plate, 11 protection member, Z heat insulation medium, 12 ... adhesive sealing material, 13 ... elastic adhesive

────────────────────────────────────────────────── ─── Continued on the front page (56) References JP-A-11-137451 (JP, A) JP-A-9-98891 (JP, A) JP-A-9-98892 (JP, A) JP-A-6-98892 169849 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) A47J 41/02 102 A47J 41/00 302

Claims (2)

(57) [Claims] 1. A double-walled heat-insulating container in which an inner container and an outer container are integrally joined via a space portion, and the space portion is formed of a heat-insulating layer provided with a heat-insulating medium such as a gas having a low thermal conductivity. Then, a ventilation hole provided in one of the inner container and the outer container for disposing a heat insulating medium in the space is sealed with an adhesive sealing material.
Seal with a stopper plate, and the sealing plate is further connected via an elastic adhesive.
A ventilation hole sealing structure for a double-walled heat insulating container, which is covered with a protective member . 2. An inner container and an outer container are connected via a space.
In the space of the integrated double-walled container, an inner container and an outer container
Insulation medium is provided through vent holes provided in one of the
After that, a sealing plate is arranged in the ventilation hole via an adhesive sealing material,
Seal the ventilation holes, and then apply the elastic adhesive to the sealing plate.
Characterized by being covered with a protective member through the middle
The sealing method of the ventilation hole sealing part.