JPH11290220A - Synthetic resin insulation device and method of manufacturing the same - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To suppress deformation and damage of the container wall caused by the expansion pressure of the low thermal conductivity gas enclosed as a heat insulating layer due to stored food and heat at the time of washing, it is lightweight and has excellent heat retention effect. Provided is a synthetic resin heat insulator and a manufacturing method. SOLUTION: An inner container 3 made of synthetic resin is arranged in a space 5 without an outer container 4 made of synthetic resin, and connected and integrated at respective open ends 3a, 4a to form a container having a double wall structure. A heat insulating layer body 6 in which a gas Z having a lower thermal conductivity than air is sealed in a gas sealing container 7 made of a synthetic resin in the gap portion 5 via an adhesive S, Void 5
And integrated with the inner and outer containers 3 and 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an insulated container including an insulated container such as a thermos bottle, a cooler box, an ice box, an insulated cup, an insulated tableware and an insulated lunch box, and an insulated cover covering an opening of the insulated container. More specifically, a double-walled heat-insulating container and heat-insulating lid having a heat-insulating layer formed by enclosing a gas having low thermal conductivity interposed between an inner container made of synthetic resin and an outer container made of synthetic resin And the like.

[0002]

2. Description of the Related Art Insulated containers such as thermos bottles, cooler boxes, ice boxes, insulated cups, insulated tableware and heat-insulated lunch boxes have advantages such as light weight, ease of molding, and low manufacturing cost. Therefore, the development and commercialization of synthetic resin insulation containers have been promoted. This type of synthetic resin insulated container accommodates a synthetic resin inner container, which is arranged with a gap therebetween in a synthetic resin outer container having a slightly larger and similar shape. The open end of the outer container is joined and integrated to form a double-walled container with the inner and outer container walls as walls. In addition, the present invention is a heat insulating container in which a low heat conductivity gas made of at least one of krypton, xenon, and argon is sealed in the gap to form a heat insulating layer with improved heat insulating performance.

Further, the heat insulating lid made of synthetic resin which covers the heat insulating container has the same structure as that of the above-mentioned container, and its shape is the same as the shape of the opening corresponding to the opening of the container to be covered. None and shallowly formed. Therefore, a heat insulating container including both of them will be described below by exemplifying a heat insulating container in order to facilitate understanding. In order to form a heat-insulating layer in this kind of heat-insulating container, a method of filling a gas having a low thermal conductivity into the container wall portion is to form a gap formed between the inner and outer containers by combining and integrating the inner and outer containers. For the method of filling the gas directly into the space, or as another method, use a synthetic resin with high gas barrier properties in advance to separate the gas into the shape of the gap formed between the inner and outer containers. A container body is formed, and a low thermal conductivity gas is sealed in the gas sealing container body to prepare a heat insulating layer body. After disposing the heat insulating layer body in a gap formed between the inner and outer containers,・ It is a method of connecting and integrating the outer container.

[0004] In the heat insulating container in which the above-mentioned low thermal conductivity gas is directly sealed in the gap between the inner and outer containers, the sealed low heat conductivity gas does not leak from the gap in order to maintain the heat insulating performance. As described above, a synthetic resin having a high gas barrier property is used. However, a synthetic resin having a high gas barrier property generally absorbs moisture and moisture when it comes into contact with the resin, thereby lowering the gas barrier property. However, since this kind of container accommodates food and drink due to its use, contact with hot water or moisture cannot be avoided. As a result,
Even if a synthetic resin with high gas barrier properties is used,
Due to contact with hot water or moisture, the filled gas with low thermal conductivity permeates through the synthetic resin wall and leaks to the outside, making it difficult to maintain heat insulation performance.

[0005] For this reason, a water-resistant synthetic resin, which does not easily transmit moisture even when it comes into contact with hot water or moisture, is placed on the inner and outer containers on the wall surface on the side where there are many opportunities to come into contact with hot water or moisture. A double wall in which a heat insulating layer body in which a low thermal conductivity gas is sealed in a gas sealing container separately molded with a synthetic resin having high gas barrier properties is housed and arranged in the gap formed by the inner and outer containers. Has been proposed.

[0006]

The above-mentioned synthetic resin heat insulator is used for storing hot beverages and foods in a container and maintaining the temperature thereof. In addition, in washing after use, washing with hot water and drying after washing are often exposed to high temperatures such as using a high-temperature heating dryer or a hot-air dryer. In particular, in the case of cleaning for business use such as hospitals and catering centers, long-term cleaning and drying should be performed over a long period of time, including high-temperature sterilization, in consideration of hygiene. That is the fact. However, when a synthetic resin is generally exposed to a high temperature, its mechanical strength is reduced, and the synthetic resin is easily deformed by an externally applied force.

[0007] From the above, the synthetic resin insulated container such as the synthetic resin insulated container and the synthetic resin insulated lid according to the present invention can be used at the time of storing high-temperature food and drink, washing and drying. Is heated by hot water or hot air and easily deformed. At the same time, the low thermal conductivity gas sealed in the gap between the inner and outer containers to form the heat insulating layer of the synthetic resin heat insulator is also heated and expands in the gap. As a result, the double wall composed of the inner and outer containers of the synthetic resin insulated object acts on the expansion pressure from the inside of the gap to the outside due to the expansion of the gas sealed in the gap between them.
It will be deformed. In particular, a flat portion is more likely to be deformed by a pressure load. The deformation caused by the turgor pressure generated in this manner does not restore the original shape even after being deformed and released from hot water or hot air. As a result, there has been an inconvenience that it is difficult to continuously use the kind of synthetic resin heat insulator once deformed while maintaining the same function and use state as the original state before deformation.

In order to solve this inconvenience, measures have been taken to increase the strength by increasing the thickness of the walls of the inner and outer containers. However, at high temperatures, the bending strength of the synthetic resin becomes extremely small. It was not a drastic measure. Also, when the wall thickness is increased, the weight becomes heavier, giving rise to a feeling of "raising the bottom" such that the volume is smaller than the size of the visual sensation, and there is a problem that the price is increased.

The present invention solves such inconveniences and problems, and the synthetic resin which is variously affected by heat is less deformed even when cooked or heated food is stored in a heated state. In addition, even if the low thermal conductivity gas sealed between the inner and outer container walls for heat insulation expands due to heating, the expanded pressure does not not only deform the inner and outer container walls, but also provides gas barrier properties due to moisture. SUMMARY OF THE INVENTION It is an object of the present invention to provide a synthetic resin insulated article which is excellent in heat retaining effect, is lightweight, and has a good work efficiency in production, and which prevents deterioration of the synthetic resin.

[0010]

SUMMARY OF THE INVENTION In order to solve the above-mentioned conventional inconveniences and problems and to achieve the object, a first aspect of the present invention is described.
The inner container made of synthetic resin is arranged in the outer container made of synthetic resin with a gap therebetween, and is joined and integrated at each open end to form a container having a double wall structure, A heat insulating layer in which a gas having a lower thermal conductivity than air is sealed in a synthetic resin gas enclosing container in the gap through an adhesive, and is fixed and integrated in the gap. Claim 2 is characterized in that the adhesive is a moisture-curable adhesive.
According to the synthetic resin insulation device described in,
According to a third aspect of the present invention, the synthetic resin of the gas filling container of the heat insulating layer is made of a synthetic resin having high rigidity.

According to a fourth aspect of the present invention, a synthetic resin inner container is housed in a synthetic resin outer container having a larger shape and arranged with a gap therebetween. After disposing a heat insulating layer in which a gas having a low thermal conductivity is sealed in a container made of a synthetic resin which is formed in advance in an airtight manner, and disposing the inner container with an adhesive on the surface thereof, and removing the inner container. A method for manufacturing a synthetic resin insulated object characterized by being housed in a container and then connecting and integrating the open ends of the inner and outer containers.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION The synthetic resin heat insulator of the present invention comprises:
The container includes a container and a lid that is detachably attached to an opening of the container. When the food and drink are stored, the inner container facing the food and the stored food comes into contact with the food and the outer container facing the air and exposed to the food are each made of synthetic resin. Then, these inner containers and the outer container are placed so that the inner container is housed in the outer container and separated by a gap, and these ends (open ends) are joined together.
It is integrally formed as a double-walled structure with a void portion interposed.

In order to form the above-mentioned container having a double-wall structure, a krypton, xenon, krypton, etc. gas is filled in a gas filling container formed of a synthetic resin having a high gas barrier property, which is separately manufactured, in a space between the inner and outer containers. A heat-insulating layer body in which a gas having a lower thermal conductivity than air made of at least one kind such as argon is sealed is provided. And when arranging this heat insulating layer in the void portion, an adhesive is interposed between each of the inner container and the outer container and the heat insulating layer, and is arranged.
It is a heat insulator in which a heat insulating layer is fixedly held in a gap formed by an inner / outer container.

The synthetic resin used in the inner container and the outer container is preferably a synthetic resin excellent in heat resistance, water resistance (moisture permeability resistance) and mechanical strength. Specifically, the moisture permeability (“JIS
Z 0280 ”) is a temperature of 40 ° C. and a relative humidity of 90.
Or less moisture permeability 50g / m ² / 24hr at% conditions.
In addition, a composite having a flexural modulus (according to “ASTM D790”) of 10,000 kg / cm ² or more and an Izod impact strength (with notch) (according to “ASTM D256”) of 5 kg · cm / cm or more Resins are preferred, and as synthetic resins meeting these conditions, polypropylene, heat and moisture resistant polycarbonate, ABS, polystyrene,
Resins such as AS, polyethylene, vinyl chloride, and polyamideimide are preferably used.

On the other hand, as the synthetic resin of the gas filling container for forming the heat insulating layer, a synthetic resin having excellent gas barrier properties (gas impermeability) is preferable. Specifically, the gas permeability of the film ("ASTM D 1438-58")
Compliance) is ^{1.0g / m 2 / 24hr / atm} ( object _{gases: O 2, N 2, CO} 2) or less is a synthetic resin is preferred, as being compatible with this, such as polyethylene terephthalate, polyethylene naphthalate Polyester such as nylon 6, polyamide such as nylon 6, polyvinyl alcohol such as ethylene vinyl alcohol, acrylic resin such as polyacrylonitrile, or synthetic resin such as polyvinylidene chloride can be preferably used.

Further, in addition to the above, a synthetic resin having high rigidity, for example, a reinforced resin containing glass or the like, or nylon can be used as the synthetic resin of the gas filling container for forming the heat insulating layer. In this case, it is possible to increase the strength or to reduce the thickness of the heat-insulating layer, thereby making it possible to reduce the weight and to improve the volumetric efficiency.

When the heat insulating layer is housed and fixed in the space between the inner and outer containers, the adhesive disposed between the heat insulating layer and the inner and outer container walls is solidified by reacting with moisture. It is effective to use a moisture-curable viscous adhesive (including an adhesive) or an elastic adhesive. By using a moisture-curing adhesive as the adhesive, the adhesive absorbs and removes the moisture absorbed by the gas barrier synthetic resin forming the gas filling container. As a result, As a result, an effect of further improving the gas barrier property of the synthetic resin of the gas enclosing container forming the heat insulating layer is brought about. Furthermore, it is not an instant adhesive that cures instantly, but a viscous adhesive (including an adhesive) that cures while maintaining its viscosity for a while, or a rubber with the hardness of 100 to 200%. By using a certain elastic adhesive or the like, when the inner container and the outer container are joined and integrated at these ends, when using a vibration welding machine suitable for welding synthetic resin, this viscous adhesive is used. It functions as a cushioning material, and effectively prevents damage to the synthetic resin container for gas filling of the heat insulating layer body due to vibration.

When the food and drink are accommodated in the insulated container having such a configuration and used, or when washed with hot water or the like after use, or after the washing, the insulated container using a drier or the like is used. Even if the resin is left in a high temperature environment for a long time, such as when drying it, and the temperature of the synthetic resin itself rises and the strength becomes weak, the adhesive is interposed between the inner and outer containers and the heat insulating layer. By being adhered to each other, the strength of the synthetic resin used for each of the inner container, the outer container, and the gas sealing container of the heat insulating layer can be increased. Moreover, with the interposition of adhesive,
The gap of the remaining air layer generated between the outer container and the heat insulating layer is reduced, and as a result, the amount of expansion caused by the heating of the air in the space where the thermal layer is disposed is extremely reduced, and the deformation due to the pressure expansion Can be prevented. From this, it is possible to increase the strength even with a small amount of application by applying an adhesive, particularly to a flat wall portion that is weak in strength under the influence of turgor pressure. In addition, outward bulging of the inner and outer container walls due to turgor pressure can be reduced.

Further, in manufacturing the synthetic resin insulated container of the present invention, when disposing a synthetic resin inner container formed into a desired shape and an outer container with a gap therebetween, a gas barrier is previously set at the gap position. A heat-insulating layer in which a gas having a low thermal conductivity is hermetically sealed in a gas-sealing container made of highly synthetic resin, an adhesive is applied to the outer surface of the heat-insulating layer, and the inner and outer containers are arranged. After being combined and arranged, the open end of the inner container and the open end of the outer container are welded and joined using a vibration welding machine or the like to integrate them. Therefore, the adhesive acts as a vibration damping material, maintains good heat insulation performance without inducing damage such as cracks in a synthetic resin material such as a gas filling container, and has excellent heat resistance and low heat conductivity. The present invention is intended to manufacture a synthetic resin heat insulator having a double-walled structure of an inner and outer vessel with a heat insulating layer filled with a rate gas.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the synthetic resin heat insulator of the present invention will be described with reference to the drawings. FIG. 1 is a partial sectional view showing an example of the synthetic resin heat insulator of the present invention. Reference numeral 1 denotes a heat insulating container made of synthetic resin, and illustrates a bowl-shaped or bowl-shaped container. Reference numeral 101 denotes a synthetic resin heat-insulating lid that is detachably covered in the opening 2 of the heat-insulating container 1.

The heat-insulating container 1 has an inner container 3 made of a synthetic resin having high water resistance and heat resistance such as polypropylene, and a shape similar to the inner container 3 in a water-resistant synthetic resin outer container 4 having a slightly larger size. The opening ends 3a and 4a are joined together by a welding machine to be integrated, and the walls of the inner container 3 and the outer container 4 are interposed with the opening 5 interposed therebetween. It forms a double wall structure with the wall.

In the space 5 between the inner container 3 and the outer container 4, a heat insulating layer 6 having a shape conforming to the shape formed as the space 5 is provided with an adhesive S interposed therebetween. 3. Adhered to the wall of the outer container 4. Heat insulating layer body 6, a gas permeability (target gas: O _2, N _2, due to CO _2, etc.) is 1.0g / m ² / 24hr / atm or less of the gas barrier property is high synthetic resin of the inner wall 7a and outer wall 7b A low thermal conductivity gas Z made of at least one kind of gas, such as krypton, xenon, or argon, is hermetically sealed at a pressure of approximately atmospheric pressure in a space 8 of the gas enclosing container 7. . Further, a radiation heat shielding material 11 such as a copper foil is stuck on the surface of the inner wall 7a on the space 8 side. Examples of the synthetic resin having a high gas barrier property having the gas permeability include polyesters such as polyethylene terephthalate and polyethylene naphthalate, polyamides such as nylon 6, polyvinyl alcohols such as ethylene vinyl alcohol, acrylic resins such as polyacrylonitrile, and poly (acrylonitrile). Synthetic resins such as vinylidene chloride can be used effectively. Further, as the adhesive S, for example, a water-curable adhesive such as “Super X (trade name)” manufactured by Cemedine Co., Ltd., or a “PM series (product) manufactured by Cemedine Co., Ltd.” Moisture-curable adhesives which are elastic adhesives such as "(name)" can be suitably used.

Reference numeral 9 denotes a gas filling port of the gas filling container 7, and reference numeral 10 denotes a sealing plate for hermetically sealing the gas filling port 9. Reference numeral 11 denotes a radiant heat shielding material disposed facing the space 8 side of the inner wall 7a of the gas filling container 7 and is formed by foil or plating of a metal such as aluminum or copper. The radiant heat shield 11 may be provided on the surface of the outer wall 7b facing the space 8, and if both are provided, the effect can be further enhanced.

Next, the heat insulating cover 101 which covers the opening 2 of the heat insulating container 1 is different from the heat insulating container 1 in that the heat insulating container 1 is used in an upside-down inverted position. Is the same. That is, when the lid is covered, the synthetic resin lid inner container 103 which is positioned to face the stored food and drink is made of a synthetic resin in a shape similar to this and slightly larger in size, and is made of synthetic resin. Are accommodated in the outer container 104 facing the container and are arranged so as to be spaced apart from each other with the gaps 105 therebetween, and the respective open ends 103a and 104a are joined together by a welding machine and integrated to form the gaps 105. , A double wall structure of the wall of the inner container 103 and the wall of the outer container 104 is formed. Each of the inner and outer lids 103 and 104 is made of a synthetic resin having high water resistance and heat resistance such as polypropylene.

Then, the lid inner container 103 and the lid outer container 10
A heat insulating layer 106 having a shape conforming to the shape formed as the gap 105 is bonded to the walls of the inner cover 103 and the outer container 104 with the adhesive S interposed therebetween. It is arranged. The heat-insulating layer 106 has a gas transmission rate (target gas: O ₂ , N ₂ , CO _2, etc.) of 1.0.
g / m ² / 24hr / atm or lower thermal gas barrier properties including at least one high krypton in the space 108 of the synthetic resin of the inner wall 107a and formed of an outer wall 107b gas filling vessel 107, xenon, argon, etc. Gas The conductivity gas Z is formed by being hermetically sealed at a pressure of about the atmospheric pressure. Further, a radiation heat shielding material 111 such as a copper foil is stuck and arranged on the surface of the inner wall 107a on the space 108 side. Examples of the synthetic resin having a high gas barrier property having the gas permeability include polyesters such as polyethylene terephthalate and polyethylene naphthalate, polyamides such as nylon 6, polyvinyl alcohols such as ethylene vinyl alcohol, acrylic resins such as polyacrylonitrile, and poly (acrylonitrile). Synthetic resins such as vinylidene chloride can be used effectively.

Reference numeral 109 denotes a gas filling container 107.
The reference numeral 110 denotes the gas filling port 10.
9 is a sealing plate for hermetically sealing 9. Reference numeral 111 denotes a radiant heat shielding material disposed on the inner wall 107a of the gas filling container 107 on the space 108 side, which is formed by metal foil or plating of aluminum, copper, or the like. The radiant heat shield 111 may be provided on the surface of the outer wall 107b facing the space 108. If both are provided on both surfaces, a further effect can be obtained.

As described above, the heat insulating container 1 and the heat insulating lid 101 made of the synthetic resin of the present invention are manufactured by the following method.
This will be described with reference to FIG. The heat-insulating lid 101 has substantially the same configuration as the heat-insulating container 1 as described above, and the manufacturing method thereof is also substantially the same. Therefore, only the method of manufacturing the heat-insulating container 1 will be described, and the method of manufacturing the heat-insulating lid 101 will be described. Is shown in FIG.
Is shown only in the sectional view of FIG. As for the heat-insulating lid 101, “inner container” in the following description is replaced with “lid inner container”, “outer container” is replaced with “outer lid container”, and the symbol of the heat-insulating lid 101 is The configuration common to the reference numerals of the “insulated container 1” includes 100
Since the last two digits of the value are indicated by the same reference numerals, the following description of the method of manufacturing the heat-insulating container 1 allows a sufficient understanding of the method of manufacturing the heat-insulating lid 101.

FIG. 2 is an assembled sectional view of the synthetic resin heat insulating container 1 of the present invention. First, an inner container 3 having a desired shape made of a heat-resistant and water-resistant synthetic resin, for example, polypropylene, and an outer container 4 having a size slightly larger than the inner container 3 and having a substantially similar shape.
Are made into a thickness of 1.0 to 2.5 mm and are manufactured by molding. On the other hand, the gas filling port 9 is provided by a synthetic resin appropriately selected from the various synthetic resins having high gas barrier properties,
In addition, in order to obtain a gas filling container 7 having a shape conforming to the shape of the gap 5 formed between the inner and outer containers 3 and 4 by integrally connecting the inner and outer containers 3 and 4, the wall thickness is set to about 1.0 mm. To form the inner wall 7a and the outer wall 7b. Then, a radiation heat shielding material 11 made of copper foil is attached and disposed on the side of the inner wall 7a facing the space 8, and the inner and outer walls 7a and 7b are joined together at their edges to be integrated. A gas filling container 7 having a space 8 is obtained.

Subsequently, after the air in the space 8 is evacuated to a pressure of 10 Torr or less by an exhaust means such as a vacuum pump through the gas filling port 9, the above-mentioned various low thermal conductivity gases Z are filled to approximately atmospheric pressure. Then, a sealing plate 10 made of the same synthetic resin material as that of the gas filling container 7 is air-tightly contacted with the gas filling port 9 and bonded or welded to seal the gas filling port 9 to form the heat insulating layer 6. obtain.

As described above, the heat-insulating layer 6 thus obtained is provided with the heat-insulating layer 6 at the position of the void 5 formed between the inner container 3 and the outer container 4 formed in advance. An adhesive S is applied to the outer surface of the formed synthetic resin gas filling container 7.
After applying, it is arranged. In the case of a synthetic resin that is difficult to adhere to, a stronger treatment can be performed by performing a surface treatment such as a primer treatment or a frame treatment in advance. Then, the opening edge portions 3a and 4a of the inner container 3 and the outer container 4 are joined and integrated by welding means such as vibration welding or ultrasonic welding, and a desired low thermal conductivity gas Z is sealed therein. The synthetic resin heat insulating container 1 composed of the layer body 6 is obtained.

The adhesive S is preferably a moisture-curable viscous adhesive that gradually cures over time. For example, a viscous adhesive such as “Super X (trade name)” manufactured by Cemedine Co., Ltd. A moisture-curable adhesive that is an agent (adhesive) or a moisture-curable adhesive that is an elastic adhesive such as “PM Series (trade name)” manufactured by Cemedine Co., Ltd. can be suitably used. The use of such a moisture-hardening type viscous adhesive allows the adhesive S to function as a buffer for absorbing vibration during the welding process for connecting and integrating the inner container 3 and the outer container 4, and to provide insulation. This prevents the gas sealing container 7 made of synthetic resin of the layer body 6 from inducing damage such as cracks due to vibration. And the heat insulation container 1 excellent in heat insulation performance can be manufactured with very good workability.

The moisture absorbed by the synthetic resin of the gas filling container 7 of the heat insulating layer 6 having a gas barrier property during the production or during the storage after the production causes the heat insulating layer 6 to move inside and outside as described above. After being integrated with the containers 3 and 4 via the moisture-curable adhesive S, the water reacts with the applied moisture-curable adhesive to consume water, and as a result, the moisture is removed and the moisture-curable adhesive is removed. The adhesive solidifies S. That is, the synthetic resin of the gas sealing container 7 of the heat insulating layer 6 is dehydrated by the adhesive S to be in a dry state, and the gas barrier property is enhanced, and the heat insulating layer 6 is attached to the walls of the inner and outer containers 3 and 4. It is firmly fixed and integrated, and the strength of the heat insulating container 1 can be increased.

As a result, the heat insulating layer 6 of the present invention is
The heat insulating container 1 integrated and integrated by interposing the adhesive S in the space 5 between the inner container 4 and the outer container 4 exhibits a remarkable effect of maintaining the heat insulating performance for a long period of time. Further, the heat insulating container 1 manufactured by this manufacturing method includes the inner and outer containers 3 and 4 and the heat insulating layer 6.
Are integrated with an adhesive, so that the strength is enhanced. Therefore, when exposed to a high-temperature environment and the temperature of the synthetic resin itself rises, the mechanical strength is weakened. In addition, the low thermal conductivity gas enclosed in the heat insulating layer body 6 due to the temperature rise, Alternatively, even if bulging pressure is generated due to the expansion of air remaining in the gap between the heat insulating layer body 6 and the inner and outer containers 3 and 4, the swelling member retains sufficient strength to withstand the pressure and does not undergo extreme deformation. Thus, a heat-insulating container with high durability can be obtained.

The method of manufacturing the heat insulating container 1 has been described above, but the heat insulating lid 1 covering the opening 2 of the heat insulating container 1 is described.
01 can be manufactured in the same manner as the heat insulating container 1 as shown in the assembled sectional view shown in FIG. Then, the same operation and effect can be obtained.

[Experimental Example] As the above-mentioned synthetic resin heat insulator of the present invention, a bowl-shaped heat-insulating container 1 having the following specifications and a heat-insulating lid 101 covered by the same are manufactured by the above-described method. Manufactured according to And it experimented about the degree of deformation by heat. ● Specifications of the heat insulating container 1 ・ Inner container 3: material: polypropylene (GL5046T, manufactured by Chisso Corporation), wall thickness: 1.5 mm, capacity: 3
00cc. -Outer container 4: Material: polypropylene (GL5046T, manufactured by Chisso Corporation), wall thickness: 1.5 mm, size:
A 7 mm gap portion 5 was formed and arranged on the outer peripheral wall of the inner container 3. -Heat insulation layer 6: Material of container 7 for gas filling: Nylon (M1030D, manufactured by Unitika Ltd.), Wall thickness: 1 mm,
Radiation heat shielding material 11: copper foil, gap width of gas filled space 8: 5 mm, filled low thermal conductivity gas Z: 10 Torr. Adhesive S: A water-curable viscous adhesive (Super X, manufactured by Cemedine Co., Ltd.), particularly applied to the bottom of the inner container. In a gap 5 formed between the inner container 3 and the outer container 4, a heat insulating layer 6 is disposed after applying a moisture-curable adhesive S thereto, and the respective open ends of the inner container 3 and the outer container 4 are arranged. Parts 3a, 4
a was quickly and air-tightly welded and joined together by a vibration welding machine to obtain a desired bowl-shaped insulated container 1.

● Specifications of the heat-insulating lid 101 ・ Lid inner container 103: material: polypropylene (GL5046T, manufactured by Chisso Corporation), wall thickness: 1.5 mm, size: matching the opening 2 of the heat-insulating container 1 It was the size to be attached. Outer lid container 104: Material: polypropylene (GL5046T, manufactured by Chisso Corporation), wall thickness: 1.5 mm, size: 7 mm gap portion 105 was formed and arranged on the outer peripheral wall of inner container 103. Heat insulation layer 106: Material of gas filling container 107: Nylon (M1030D, manufactured by Unitika Ltd.), Thickness:
1 mm, radiation heat shielding material 111 ... copper foil, gas-filled space 1
08 gap width ... 5mm, sealed low thermal conductivity gas Z ... 10
After exhausting to below Torr., Krypton is sealed almost at atmospheric pressure. Adhesive S: A water-curing type viscous adhesive (Super X, manufactured by Cemedine Co., Ltd.), especially applied to the bottom of the lid inner container. In a gap portion 105 formed between the inner cover 103 and the outer container 104, a heat insulating layer 106 is disposed after applying a moisture-curable adhesive S to the inner space 103, and the inner cover 103 and the outer container 10 are arranged.
4 and the respective open end portions 103a and 104a were quickly and air-tightly welded and bonded together by a vibration welding machine to obtain a desired heat-insulating lid 101.

An experiment was conducted on the influence of heat on the heat-insulating container and heat-insulating lid of the present invention obtained as described above. The experiment was carried out on the degree of deformation of the heat insulating container 1 or the heat insulating lid 101, which was caused by the expansion of the gas existing in the heat insulating layer 6 or 106 of the heat insulating container, depending on the ambient temperature to which the heat insulating container 101 was exposed. . The aeration atmosphere temperature was in the range of 20 ° C. to 120 ° C., and the temperature was controlled using a constant temperature bath controlled at a predetermined temperature within ± 5 ° C. In addition,
FIG. 4 is a partial cross-sectional view of the heat-insulating container illustrating the procedure for measuring the degree of deformation. The experiment was performed according to the following procedure. As a reference state, the container is aerated at 20 ° C. for 2 hours, and after the aeration, as shown in FIG.
The dimension up to ₀ (h ₀ ) was measured and used as the reference dimension. It is aerated at a predetermined temperature. The aeration time was 1 hour. After aeration at a predetermined temperature for one hour,
Leave for a time. After that, the external dimensions are inspected. The dimensions of the measurement from the opening 2 edge as shown in FIG. 4 to the bottom 3b ₁ of the inner container (h ₁₎
Is measured. And it contains altered subsequent sequential aeration temperature, bottom 3b ₁ has changed from the opening 2 edge at that _{temperature, 3b 2, 3b 3, ---} , 3b n
The dimensions h ₁ , h ₂ , h ₃ ,..., H _{n up} to are measured.

The above dimensions due to aeration temperature change obtained by the measurement (℃) as changes dh _{(1, 2, 3, over over over, n)} = h ₀ over (h _1,
h _2, h _3,ｰｰｰ, illustrated amount blister to h _n) as (mm) in the curve of FIG. 5 (b). In order to clarify the effect of the durability performance by the temperature of the heat insulator of the present invention, as a [Comparative Example], the heat insulating layer body 6 including the gas sealing container 7 according to the present invention was not inserted with an adhesive, and -A heat insulator placed in the space 5 between the outer containers 3 and 4 was used. Otherwise, a container having the same specifications and specifications as the above-described container of the present invention was manufactured, and a similar experiment was performed on the container. The results were obtained by the comparative example curve (b) in FIG. This is shown in comparison with the change curve (a).

As is clear from the graph of FIG. 5, in the heat insulating container in which the heat insulating layer of the present invention is fixedly bonded between the inner and outer containers via an adhesive, the dimension indicating the swelling amount (mm) is obtained. As shown in the change curve (a), even at an aeration temperature of 100 ° C., the deformation is hardly visually perceived at 0.5 mm or less and the effect is extremely excellent in environmental temperature resistance. showed that. At a temperature of 120 ° C., a deformation of about 3 mm was shown, but this value was at a temperature of 120 ° C., and in general, there was little opportunity to come into contact with a temperature of 120 ° C. under atmospheric pressure. Rare in dishware. In addition, even in the case of washing, considering that hot water having a high temperature is used, the temperature is at most 100 ° C., and the setting of the drying temperature of the tableware and the like in the dryer is about 1 hour.
Since it is common to set the temperature around 00 ° C., it indicates that the heat insulating container can sufficiently withstand a high use temperature. In addition, since the storage and holding time of food and drink in the seed container is practically generally one hour or less of the aeration time in the present experiment, the size of the heat insulator according to the present invention which is swollen due to the temperature is reduced. The change (mm) showed a value smaller than the curve (a) of the present invention, and it could be confirmed that the heat-insulating container was extremely durable in use as a container for heated food.

On the other hand, in the case of a conventional heat insulator in which the heat-insulating layer is directly disposed between the inner and outer containers without using an adhesive, as shown by the comparative example curve (b), the conventional heat-insulating material has a thickness of 60%. ° C
No deformation such as swelling was observed up to the temperature of
Swelling gradually appears from ℃, 0.8mm at 70 ℃
Swelling amount of about 1 mm at 90 ° C.
At a temperature of not more than ° C., the swollen amount was such that it was difficult to visually confirm. However, at a temperature of 100 ° C., 2.5 m
In addition to showing the amount of swelling close to m, when the temperature reached 100 ° C. or more, it was shown that the appearance of swelling significantly occurred in the entire container including the side wall having a curved surface in addition to the bottom portion having a flat surface. . Also, it can be easily imagined that the larger the area of the plane portion, the larger the difference in the amount of swelling. Compared with the dimensional change due to heat of the heat insulator using such a conventional heat insulating layer in which the low thermal conductivity gas is sealed, the heat insulating layer is formed by interposing the adhesive of the present invention.
It could be further understood and confirmed that the heat insulator had an extremely small dimensional change due to heat and was extremely excellent in heat resistance in the heat insulator integrated with the outer container.

In the above-described embodiments and examples, the bowl-shaped vessel has been described as an example of the heat insulation vessel made of synthetic resin. However, the present invention is not limited to this. If it is a container, it is needless to say that the present invention can be applied to a container such as a thermos, an insulated lunch box, a cooler box, and an insulating cup. As described above, a viscous pressure-sensitive adhesive is included as an adhesive.

[0042]

The present invention is embodied in the above-described embodiment, and has the following effects. That is, the heat insulating layer is bonded between the inner container of the heat insulating container and the outer container or between the inner container of the heat insulating lid and the outer container of the lid with an adhesive to form an integrated structure. Because it is a resin insulation product, even if a heated article is put in during use or exposed to a high temperature environment during cleaning, the sealed low thermal conductivity gas and the inner and outer containers that form the heat insulating layer of the insulation product The air remaining in the gap between them expands due to heat, and the turgor pressure generated by the heat can suppress the appearance deformation of the heat insulator to a very small extent. Therefore, washing and drying at a high temperature became possible, and a management treatment preferable for hygiene became possible.

In producing the synthetic resin insulated container of the present invention, the inner container of the insulated container or the outer container and the heat insulating layer, or the inner container or the outer container of the heat insulating lid and the heat insulating layer are used. Between the inner container of the heat insulating container and the outer container, and by using a viscous adhesive,
After disposing an insulating layer between the lid inner container of the heat insulating lid and the lid outer container with an adhesive interposed therebetween, and joining the ends of these inner containers and the outer container with a vibration welding machine or the like, Since the adhesive acts as a cushioning material, the synthetic resin material of the gas filling container forming the heat insulating layer does not suffer from damages such as cracks and the like, and a synthetic resin heat insulator having excellent heat insulating performance can be produced with high work efficiency. Assembled, it has a remarkable effect of significantly improving product yield in terms of productivity.

In addition, by using a moisture-curable adhesive as the adhesive, the moisture absorbed by the heat insulating layer is consumed by reacting with the adhesive, and the moisture is removed. As a result, the synthetic resin material of the gas enclosing container of the heat insulating layer retains gas barrier properties, maintains the heat insulating effect of the enclosed low thermal conductivity gas, and maintains an excellent heat retaining effect over a long period of time. It is possible to provide a synthetic resin heat insulator.

[Brief description of the drawings]

FIG. 1 is a partial sectional view of a heat insulating container and a heat insulating lid showing an example of a synthetic resin heat insulator of the present invention.

FIG. 2 is an assembled sectional view of a heat insulating container which is an example of the synthetic resin heat insulator of the present invention.

FIG. 3 is an assembled cross-sectional view of a heat-insulating lid, which is an example of the synthetic resin heat-insulating device of the present invention.

FIG. 4 is a partial cross-sectional view of a synthetic resin heat-insulating container for explaining how to measure the degree of deformation due to heat.

FIG. 5 is a graph showing a change in swelling amount as a dimensional change with a change in aeration temperature of a synthetic resin heat insulator.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Insulated container 2, 102 ... Opening, 3 ... Inner container,
4, outer container, 5, 105, void, 6, 106, heat insulating layer, 7, 107, gas sealing container, 8, 108
Space, 9, 109: gas filling port, 10, 110: sealing plate, 11, 111: radiant heat shielding material, 101: heat-insulating lid, 103: lid inner container, 104: lid outer container, S: adhesive, Z … Low thermal conductivity gas

Claims (4)

[Claims] 1. An inner container made of a synthetic resin is disposed in an outer container made of a synthetic resin with a gap therebetween, and is joined and integrated at each open end to form a container having a double wall structure. In addition, a heat insulating layer body in which a gas having lower thermal conductivity than air is sealed in a gas filling container made of a synthetic resin in the gap portion is disposed via an adhesive, and is fixedly integrated with the gap portion. A synthetic resin insulation device characterized by the following. 2. The synthetic resin insulation device according to claim 1, wherein the adhesive is a moisture-curable adhesive. 3. The synthetic resin insulated article according to claim 1, wherein the synthetic resin of the gas filling container of the heat insulating layer is made of a rigid synthetic resin. 4. When the inner container made of synthetic resin is housed in an outer container made of synthetic resin having a larger shape and arranged with a gap therebetween, low heat conductivity is applied to the container made of synthetic resin which is formed airtight in advance. The heat-insulating layer in which the gas of the ratio is sealed is disposed at the position of the gap formed by interposing an adhesive on the surface thereof, and then the inner container is accommodated in the outer container, and then each opening of the inner / outer container is opened. A method for producing a synthetic resin heat insulator, wherein ends are combined and integrated.