JPH077871Y2 - Convection heat insulation container - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of use) The present invention relates to a heat insulating container using a heat insulating base material, and more specifically, to improve the heat insulating effect by causing convection of heated air in the container. The present invention relates to a container for keeping heat, which is useful as a container for storing a box lunch for commercial use and other cooked foods for commercial use and which is suitable for warm storage.

(Prior art) Styrofoam containers are widely used as a heat-insulating container that has both heat insulation and impact resistance. Has been proposed, in which a chemical exothermic agent that generates heat due to a hydration reaction is accommodated in the exothermic agent accommodating portion so that the exothermic agent generates heat when heating is required.

Further, in a food container, the concept of laying a water-absorbent sheet or a water-absorbing agent on the inner bottom of the container or the like in order to absorb moisture or juice generated in the container is also known.

(Problems to be solved by the invention) However, in the conventional container, since the article storage part is separated from the exothermic agent storage part by the partition wall, the warming is performed indirectly only through the partition wall surface, so that the container is not sufficiently heated. No warming effect can be obtained.

Further, in a conventionally known heat-retaining container, the dew condensation water of the steam generated in the container from the housed article or the juice leaching from the housed article is partially absorbed by a sheet or a water absorbing agent laid on the inner bottom of the container or the like. However, it is not possible to sufficiently prevent the adherence of moisture to the stored article, that is, the damage to the stored article due to the moisture, and the sheet or the water absorbent partially swells to come into contact with the stored article. It has a drawback that it becomes easy and promotes damage to the article, and when a water-absorbing agent is used, there is also a risk of mixing into the article to be stored.

In the case of the heat insulation container containing the chemical exothermic agent, the above-mentioned problems become more serious as the moisture generation from the heated article to be stored and the moisture generation from the exothermic agent itself overlap.

The present invention solves the various problems described above, provides effective heating and warming, and provides a container in which damage to the stored items due to dew condensation water or liquid juice is greatly improved, and further heating by a chemical exothermic agent is provided. An object of the present invention is to provide a heat retaining container capable of maintaining the temperature for a long time.

(Means and Actions for Solving the Problems) In order to solve the above problems, the convection heat insulation container according to the present invention is a container with a lid made of a heat insulating material, and the container body has a partition wall for storing articles above. Section and a lower exothermic agent storage section, and a partition wall is formed with a vent hole that connects the article storage section space and the exothermic agent storage section space,
In addition, the upper surface of the partition wall is formed as a downwardly inclined surface toward the ventilation hole formed in the wall.

The convection heat insulation container according to the present invention stores an article to be kept warm such as a bento box or cooked food in the article storage section, and stores the chemical exothermic agent which generates heat by touching air in the exothermic agent storage section. To do. Examples of the chemical exothermic agent that can be preferably used include iron powder, iron oxide, etc. as a main component, and a composition in which activated carbon, fibrin, salt, water, etc. are mixed, and these exothermic agent compositions are Ordinarily, a pouch such as a non-woven fabric which is easily permeable to oxygen is filled, and the pouch is further sealed and packaged with an oxygen impermeable material, and is commercially available. When using this type of chemical exothermic agent, unseal the package and store it in the exothermic agent storage section, and seal the ventilation hole of the exothermic agent storage section to block contact with outside air until heat generation starts. .

When the article to be kept warm is stored in the article storage portion and is heated, the sealant is removed to release all the vent holes of the exothermic agent storage portion to start the heat generation of the chemical exothermic agent. The air necessary for the exothermic reaction of the chemical exothermic agent is sufficiently supplied from the open vent hole, and the heated air convects and circulates in the exothermic agent storage space, and part of it is formed on the partition wall. The low temperature air in the space for the exothermic agent storage portion descends along the peripheral wall through the ventilation hole that is located above, and is discharged to the outside air through the other ventilation hole that is opened. The convective heat-insulating container according to the present invention is capable of effectively keeping warm the stored article due to the convection phenomenon that occurs when a chemical exothermic agent that generates heat by contact with air is stored and used. it can.

As the heat insulating base material used for the lid and the container body, a foamed resin sheet made of general-purpose polystyrene, impact-resistant polystyrene, or the like, woven cloth, non-woven cloth, flocked material, paper, wood, etc. having a required thickness and shape-retaining property. Examples thereof include a plate material, a synthetic resin multilayer sheet having a hollow portion, and a honeycomb-structured sheet, and the foamed resin sheet is most preferable in terms of material cost, molding processability, and the like.

In addition, since the upper surface of the partition wall that divides the container body vertically, that is, the article storage portion and the exothermic agent storage portion, is formed as a downward inclined surface toward the ventilation hole formed therein, Condensation water of water vapor generated from the stored food etc. or water vapor generated from the chemical exothermic agent is collected toward the ventilation hole through the upper surface of the partition wall, and is dripped from the ventilation hole to the chemical exothermic agent to replenish it. be able to.

The inventors of the present invention have found that dew condensation water can be collected and poured into a chemical exothermic agent to greatly extend the heat generation duration, and have conceived this configuration.

In a preferred embodiment of the present invention, a water-carrying and moisture-absorbing layer can be provided on part or all of the inner surface of the lid and container body made of a heat insulating base material. Here, the water-carrying and moisture-absorbing layer means a layer made of a sheet material that absorbs water droplets such as dew condensation water and can quickly and widely diffuse the water-carrying water. Pulp-based nonwoven fabric and the like can be preferably used.

By providing such a water-carrying moisture-absorbing layer on the inner surface of the article storage unit, the dew condensation water of water vapor generated from food etc. can be quickly absorbed and the water carried can be diffused over a wide area, effectively damaging food etc. Can be prevented. This effect is
This is particularly noticeable when storing an article in which a large amount of condensed water is generated while being kept warm.

Further, when such a water-carrying and moisture-absorbing layer is provided on the inner surface of the exothermic agent storage portion, the dew condensation water of the steam generated from the chemical exothermic agent is
After being absorbed by the water-carrying and moisture-absorbing layer, it reaches the chemical exothermic agent placed on the bottom wall surface of the exothermic agent accommodating portion, and contributes to the extension of heat generation duration of the chemical exothermic agent. In addition, since the condensed water is absorbed and held in this water-carrying moisture absorption layer, the condensed water generated in the heat generating agent storage section does not leak from the vent hole, and even if the container is turned upside down, the condensed water is stored. There is no need to worry about contaminating food and other foods.

Furthermore, when the water-carrying and moisture-absorbing layer is provided via the water-absorbing resin layer, the water that has been absorbed by the water-carrying and moisture-absorbing layer and diffused in a wide range of water is further absorbed by the water-absorbing resin layer. It can greatly improve the water absorption capacity,
It is particularly effective when applied to the inner surface of the article storage unit when warming an article with a large amount of water.

In this case, the dew condensation water is uniformly absorbed over the entire surface of the water-absorbent resin layer by the action of the water-carrying moisture-absorbing layer, so that the water-absorbent resin layer partially absorbs water and swells partially. It does not swell and deform the container. Here, the water-absorbent resin layer means a layer made of a resin that absorbs and retains water, and the water-absorbent resin layer is, for example, a vinyl alcohol-based resin, an acrylic acid-based resin, or a copolymer of vinyl alcohol and acrylic acid. , A starch-based polymer obtained by cross-linking and polymerizing acrylic acid with starch, a cellulose-based polymer, etc., or a mixture thereof in an organic solvent and, if necessary, an adhesive, which is then used as a heat insulating base material or water-carrying moisture absorbent. It can be provided by coating on a layer or both and drying.

The above water-absorbent resin exhibits the same effect even when the water-absorbent layer is not impregnated in a layered manner between the heat-insulating base material and the water-absorbent hygroscopic layer, even if the water-absorbent layer is uniformly impregnated therein. To do.

The lid and the container body of the convection heat insulating container according to the present invention may be manufactured separately or may be integrated with a hinge portion, and can be manufactured by any conventionally known method.

When a foamed resin sheet is used as the heat-insulating substrate, a foamed resin sheet, a laminated sheet obtained by laminating a water-absorbing moisture-absorbing layer on the foamed resin sheet directly or via the water-absorbing resin layer, as a material, a vacuum forming method, It can be formed by a thermoforming method such as a pressure forming method. At this time, it is preferable to mold the water-carrying moisture-absorbent layer having low malleability so as to be in contact with the male mold. If the laminate sheet lacks in malleability and the desired depth of molding cannot be obtained,
After molding the target molded product with only the foamed resin sheet,
A water-carrying moisture-absorbing layer or a water-carrying moisture-absorbing layer having a water-absorbing resin layer may be laminated on the inner surface side thereof.

When using a plate material or sheet that is not suitable for the thermoforming method as a container material, a method such as cutting the container material such as the heat insulating base material and the laminated sheet according to the plan development view of the container and assembling and adhering it may be adopted. Good.

(Example) Hereinafter, the present invention will be described in detail with reference to the drawings illustrating an example.

1 and 2 show an example of a convection heat insulation container according to the present invention. The container body 1 and the lid 2 are both formed of a heat insulating base material 3, and the container body 1 is divided by a partition wall 4 into an article storage section 5 and a heat generating agent storage section 6. A plurality of vent holes 7a and 7b communicating with the outside air are formed in the exothermic agent storage portion 6 near the central portion of the bottom surface and in the outer peripheral edge portion of the bottom surface, as illustrated in the figure. In addition, the upper surface of the partition wall 4 is formed as a downward inclined surface toward the central portion, and in the central portion, the exothermic agent storage portion, the exothermic agent storage portion 6 and the article storage portion 5 are formed.
A ventilation hole 7c is formed to connect the two spaces.
Reference numeral 8 denotes an air contact type chemical heat generating agent which is contained in the heat generating agent storage section 6 and which contains, for example, iron oxide as a main component. Also,
Reference numeral 9 denotes an uneven portion formed on the bottom surface of the container body 1 so that the heat generating agent 8 can be placed in an appropriately floating state. It is a leg projection for maintaining a gap.

In the heat insulating container having the above-mentioned configuration, when the container body 1 and the lid 2 are made of the heat insulating base material 3 and the heat generating agent 8 is stored in the heat generating agent storage part 6 of the container and used, near the center of the bottom surface of the heat generating agent storage part 6. Sufficient air (oxygen) is sucked in through the vent holes 7a, etc., and low-temperature air is exhausted through the vent holes 7b, etc. at the outer peripheral edge of the bottom surface, so that the exothermic reaction of the exothermic agent 8 proceeds appropriately and the center of the partition wall 4 Since the vent hole 7c is formed near the portion, the heated air in the space for the exothermic agent accommodating portion 6 rises to the upper article accommodating portion 5 through the vent hole 7c, and the low temperature air is conversely ambient. To descend downwards. Due to the convection phenomenon that occurs in this way, it is possible to effectively heat the stored article.

Furthermore, since the upper surface of the partition wall 4 is formed as a downwardly inclined surface toward the ventilation hole 7c, the partition wall 4 such as water vapor generated from the food or the like stored in the article storage portion 5 or water vapor generated from the chemical exothermic agent Condensed water generated above collects in the ventilation hole 7c along the upper surface of the partition wall 4, and this ventilation hole
Since it can be dripped into the chemical exothermic agent from 7c and water can be effectively supplied, the duration of heat generation can be extended.

In the above example, the vent holes 7b at the outer peripheral edge of the bottom surface of the heat generating agent storage portion 6 may not be formed, and the vent holes 7a and 7c may be formed only in the center portion of the bottom surface and the partition wall 4. In this case, the ventilation hole 7a near the center of the bottom surface serves as both intake and exhaust.

The partition wall 4 may have the shape illustrated in FIG. 3, that is, the inner container 11 instead of the horizontal shelf-like shape. The inner container 11 is formed to have a peripheral wall surface 11a, a bottom surface 11b provided with a ventilation hole 7c, and a bent flange portion 11c at an upper edge of the peripheral wall, and the bent flange portion 11c is formed on the container body 1. It is hooked on the edge, and a proper gap 12 is secured between both peripheral wall surfaces.
A heating agent storage portion 6 is formed and arranged below 11b, and the void 12 communicates with the heating agent storage portion 6.

In this example, the water-carrying and moisture-absorptive layer 13 is provided on the inner surface of the container body 1, but the inner container 11 may be provided if desired.
It is needless to say that this can also be provided on the inner surface of the lid and the inner surface of the lid 2.

With such a configuration, the inner container 11 serves as the article storage unit 5, so that after articles such as food are stored in the inner container 11 in advance, they are hooked to the upper edge of the container body 1 to be assembled. Therefore, the work efficiency can be improved. Also, the inner wall 11
Since warm air can be convectively circulated in the space 12 formed by a and the peripheral wall of the container body 1, the warming / heating efficiency can be further enhanced.

FIG. 4 shows a further different embodiment of the above-mentioned structure, in which the inner container 11 has a vent hole 7d formed in the overhanging surface between the bent collar portion 11c formed on the periphery of the inner container 11 and the container portion. The inner container 11 is closed by an inner lid 11d, and an appropriate space 1 is provided between the inner lid 11d and the lid 2 of the container body 1.
2a is secured, and together with the space 12 between the peripheral walls, a convection space for the heated air is formed all around the inner container 11.

According to this configuration, since the warming of the stored article is performed from the entire circumference, it is more effective.

In the examples shown in FIGS. 3 and 4, an olefin heat seal resin (trade name: Cemedine Proxy Melt) is applied to one surface of a rayon-based spunlace nonwoven fabric by an extrusion coating method, and is attached to an expanded polystyrene sheet. configuration nonwoven basis weight 30 g / m ^2, laminate coat weight 7~10g / m ² of heat-sealing resin was able to demonstrate the ability of the water retention capacity 300 to 500 g / m ² at room temperature. The adsorbed water diffused uniformly, and the partial swelling phenomenon did not occur.

The container body 1 of each of the above examples may be formed as a double wall structure having inner and outer walls so that a small heat insulating gap is maintained between the inner and outer walls of the heat insulating base material forming the container body 1, Lid 2
Is also the same. In this case, the water-carrying moisture absorption layer is formed on the innermost surface. According to this configuration, the container base material is not limited to the heat insulating material such as foamed resin, and any material can be used.

FIG. 5 shows an example (the lid is omitted) of the above example in which the water absorption is further improved. The heat insulating base material 3 and the water-carrying moisture absorbing layer 13 are shown in FIG.
And a water-absorbent resin layer 14 is interposed therebetween.

According to the container having the above-mentioned structure, the water absorbed by the water-carrying and moisture-absorbing layer 13 is diffused in the layer, and the water-absorbent resin layer 14 also absorbs and retains water to further improve the water-absorbing capacity, and at the same time, due to swelling or the like. It does not cause a bulge phenomenon.

As an example, one side of a rayon spunlace nonwoven fabric is coated with an olefin heat seal resin (same as above cemedine proxy melt) and a water absorbent resin (copolymer of vinyl alcohol and acrylic acid) and attached to a polystyrene foam sheet. Constructed non-woven fabric basis weight 30g / m ² , heat seal resin coat 4g / m ² , solvent absorbent heat seal agent (trade name Cemedine A-200) mixed water absorbent resin coat 4g / m ²
The laminated material of 1 could exhibit a water retention capacity of 1500 to 2000 g / m ² at room temperature. The adsorbed water diffused uniformly, and the partial swelling phenomenon did not occur.

The water-absorbent resin can be mixed in the water-carrying and moisture-absorbing layer 13. Even in this case, the water adsorption performance is of course improved as compared with the case where only the water-carrying moisture absorption layer 13 is used. However, the uniform diffusion performance of adsorbed moisture is more excellent in the embodiment of FIG.

FIG. 6 shows an example in which the water-carrying / hygroscopic layer 13 is formed on the entire inner surface of the container body 1 in the embodiment of FIG. Omitted).

In the container of this example, the dew condensation water of the steam generated from the exothermic agent 8 travels along the wall surface and is absorbed and diffused to reach the water-carrying moisture absorbing layer 13, so that the heat-generating agent 8 receives water supply from the water-carrying moisture absorbing layer 13. Therefore, the duration of heat generation can be further extended.

FIG. 7 shows an example of a heat retaining container which is suitable for accommodating articles which generate a large amount of water during heat retention and is easily damaged by dew condensation water and which can improve the heat generation efficiency of the heat generating agent.

In the heat-insulating container of this example, the container body 1 and the container body lid 2 are made of a heat insulating base material 3, and the partition wall 4 having the vent holes 7c is formed such that the upper surface thereof is inclined downward toward the vent holes 7c. As the surfaces, the lower surfaces thereof are respectively formed as upward inclined surfaces toward the ventilation holes 7c, and the water-carrying moisture absorbing layer 13 is laminated on the inner surface of the bottom wall of the exothermic agent storage portion 6. And the article storage section 5
An inner container 11 with a lid is attached to the container in the same manner as in FIG.
Is housed inside. Inner container 11 and inner lid 11d for inner container
Is made of a sheet base material such as a polystyrene sheet or a polyethylene terephthalate sheet, and the water-carrying moisture absorbing layer 13 is laminated on the inner surface of the sheet base material with the water absorbing resin layer 14 interposed therebetween.

In the heat-insulating container configured as described above, (a) since the entire inner container is heated, dew condensation hardly occurs inside the inner container, and even if dew condensation occurs, the stored water is damaged by the dew condensation water. There is no such thing. (B) Condensation water generated above the partition wall is concentrated in the ventilation holes along the upper surface of the partition wall,
Water can be effectively supplied to the heating agent storage portion. (C) In addition, since the heat generating agent placed in the heat generating agent storage section is replenished with water from both the ventilation hole of the partition wall and the water-carrying moisture absorbing layer of the heat generating agent storage section, heat generation of the heat generating agent is maintained. The time can be extended to the maximum. (D) The warmed air in the space inside the heat generating agent storage portion rises along the lower surface of the partition wall, concentrates in the ventilation holes, and is effectively circulated to the space in the article storage portion. (E) By adjusting the water absorption capacity of the water-carrying and moisture-absorbing layer of the heat-generating agent storage portion, it is possible to prevent water leakage from the ventilation holes of the heat-generating agent storage portion.

When using the convection heat insulating container of the above example, each time, individually, to store the exothermic agent, provided with a partition wall, may then store articles such as food, in the exothermic agent storage portion of the container body,
For example, a large number of those containing only an exothermic agent are prepared in advance, and a plurality of these are stacked or individually and are made of vinylidene chloride resin, a saponified product of ethylene-vinyl acetate copolymer (EVOH), or the like with high gas barrier properties. Film
It is also possible to package them individually or in sealed packages. By doing so, the work efficiency can be improved when a large number are used at the same time, and at the same time, it is possible to flexibly cope with the number to be used even if there is a fraction.

(Effects of the Invention) The present invention described in detail above has the following particularly remarkable effects, and its industrial utility value is extremely large.

(A) The convection heat insulation container according to the present invention is excellent in heat retention effect for the stored article due to the convection effect of the air heated by the exothermic agent and the ascending effect to the article storage space.

(B) The convection heat insulation container according to the present invention is provided with an article storage unit (container body or inner container) for dew condensation water generated in the article storage unit space.
Since it is absorbed in the side wall of the container, it is possible to prevent the stored article from being damaged by dew condensation water.

(C) The convection heat insulation container according to the present invention can collect the water evaporated from the exothermic agent and the articles to be stored as condensed water and supply it to the exothermic agent again, so that the heat generation duration time can be greatly extended. You can

[Brief description of drawings]

1 and 2 show an embodiment of the present invention, and FIG. 1 is a schematic longitudinal sectional view thereof (a schematic sectional view taken along the line II of FIG. 2),
FIG. 2 is a schematic bottom view of the same, and FIGS. 3 to 7 are sectional views in the same state as FIG. 1, each showing a different embodiment. DESCRIPTION OF SYMBOLS 1 ... Container main body, 2 ... Lid, 3 ... Heat insulating base material, 4 ... Partition wall, 5 ... Article storage part, 6 ... Exothermic agent storage part, 7 ... Vent hole,
8 ... Exothermic agent, 13 ... Water carrying and moisture absorbing layer, 14 ... Water absorbing resin layer.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Tadamasa Honda Tadamasa Honda 4-24-1-511 Kaminita, Toyonaka City, Osaka Prefecture (56) References: 60-195773 (JP, U) (JP, U) Actually open 60-60228 (JP, U) Actually open 61-137318 (JP, U) Actually open 1-177187 (JP, U) Actually open 1-79426 (JP, U)

Claims (4)

[Scope of utility model registration request] 1. A container with a lid made of a heat insulating material, wherein the container body is partitioned by a partition wall into an upper article storage section and a lower exothermic agent storage section, and the partition wall has an article storage section. A ventilation hole for communicating the space with the space for the heat generating agent is formed, and the upper surface of the partition wall is formed as a downward inclined surface toward the ventilation hole formed in the wall. Convection heat insulation container. 2. The convection heat insulation container according to claim 1, wherein a water-carrying moisture absorption layer is provided on all or part of the inner surfaces of the lid and the container body. 3. The convection heat insulation container according to claim 2, wherein the water-carrying and moisture-absorbing layer is laminated on the heat-insulating base material via the water-absorbing resin layer. 4. The convection heat insulating container according to claim 2, wherein the water-carrying and moisture-absorbing layer is formed as a layer containing a water-absorbing resin layer.