JPH02154715A - Heat generating utensil - Google Patents

Abstract

PURPOSE:To satisfy both long-period preservable property and handling property in use and to use the heat generating tool also for heating a different food by fixing a water container filled with reaction water to a heat generating container and hermetically sealing a heat generating material. CONSTITUTION:The heat generating tool is composed of a heat generating container 12 having an openable upper surface, a heat generating material 9 to be housed in the container 12, and a water container 11 to be filled with reaction water 10. Further, the water container 11 is fixed to the opening edge of the heat generating container 12, and the heat generating material 9 is hermetically sealed. As the result, not only the deterioration of the function of the heat generating material 9 can be prevented in preserving the heat generating tool for a long period, but also a hydration can be surely executed only by cutting out the water container 11, and the handling property in use can be also improved. Further, the heat generating tool 4 can be also used for heating the different food by composing the heat generating utensil 4 as one separated hermetically sealed unit.

Description

[Detailed Description of the Invention] (a) Industrial Application Field This invention relates to a heating device used for heating bento boxes, retort foods, instant foods, etc. and keeping home-delivered foods warm, and is particularly focused on heat generation of hydration reaction. This applies to devices that are heated by heating.

(b) Conventional technology A food container with a heating device that utilizes the heat of hydration reaction is one that stores beverages such as alcoholic beverages and coffee (Japanese Unexamined Patent Publication No. 62-91
51 Publication), and one for general foodstuffs for the purpose of reheating bento boxes or cooking instant foods (Japanese Patent Laid-Open No. 62-1).
6371, Japanese Utility Model Application Publication No. 61-35635).

Both ice bags for beverages and general foods contain an ice bag filled with a heat-generating material and reaction water inside an outer container, but there is a big difference in how they are stored. In the former, a reaction chamber is defined at the bottom of a pot-shaped outer container, and the heat-generating material is packed together with an ice bag in an exposed state inside the reaction chamber, and the outer surface of the reaction chamber is sealed with a lid.

The shape of external containers for general foodstuffs changes in various ways depending on the type and amount of food, so external containers are not used to directly contain heat-generating materials as described above. The materials are packaged in moisture-proof film bags and the entire outer surface of the container is sealed with shrink film to prevent deterioration of the heat-generating materials that are opened during storage.

(c) Problems to be Solved by the Invention As mentioned above, food containers for beverages have excellent long-term storage stability in terms of deterioration of the heat-generating material, but because the container shape is cup-shaped, they cannot be used as storage containers for general foodstuffs. However, it can only be used exceptionally as a storage container for cups and the like.In addition, for general food products, packaged heat-generating materials are suitable for long-term storage, but all of them cannot be properly stored. The problem is that it is difficult to hydrate. The most reliable method of hydration is to completely remove the heating material from the bag before use.
This is cumbersome to operate and is not sanitary because you touch the heat generating material with your hands. In addition, the one-touch method that is commonly used to open ice bags with conventional heating devices, in which the bag is cut by pulling the cutting tape or string, causes unevenness in the shape of the bag's incision, and in the worst case, causes streaks on the bag wall. In some cases, the reaction water and the exothermic material may not come into sufficient contact with each other. This is because heat generating materials cannot flow like water.

If the entire food container is sealed using shrink wrapping, it is necessary to handle it carefully to avoid tearing the sealing film, and the cost of sealing increases when heating large foods such as bento boxes. You cannot escape the disadvantages of doing so.

In addition, food containers for lunch boxes have the disadvantage that the heat generating material undergoes a hydration reaction due to the water vapor generated from the food during transportation, making it difficult to obtain a sufficient heating effect when necessary.

Food containers for general ingredients are configured with special quantities depending on the type of food and the number 1. As a result, the cost of the container and the cost of the heating device are high, and it is necessary to change the container by printing on the outside or changing the label. Compared to food containers for beverages that can be shared, there is also the disadvantage that it is difficult to reduce the manufacturing cost of the containers.

As mentioned above, conventional food containers with heating devices have various problems in terms of versatility, cost, storage stability of the heat generating material, ease of handling during use, and the like.

This invention particularly focuses on a heating device, and by improving the storage form of the heating material and reaction water, it is possible to satisfy both long-term storage stability and ease of handling during use, and to heat different foods. The purpose is to improve its versatility and reduce manufacturing costs by making it compatible with other systems.

(d) Means for Solving the Problems In the present invention, the heating device is configured as one independent sealed unit. Specifically, as shown in FIG.
The water container 11 filled with 0 was fixed to the opening edge of the heat generating container 12, and the heat generating material 9 was sealed.

Preferably, a cutting means 13 is fixed to the water container 11 for simultaneously cutting the water container 11 and releasing the heat generating material 9 from the sealed state. Further, the water container 11 is composed of a dish-shaped container body 17 that accommodates the reaction water 10, and a seal body 18 that closes the opening surface of the container body 17.

(e) Since the heat generating material 9 is sealed by fixing the water container 11 filled with action reaction water 10 to the heat generating container 12, it is possible to prevent the function of the heat generating material 9 from deteriorating during long-term storage. The hydration reaction can be reliably caused by simply cutting open the water container 11, and the ease of handling during use can also be improved.

Since the heat generating material 9 is sealed using the water container 11, the cost required for sealing can be reduced. Furthermore, since the heating device 4 is configured as a single independent sealed unit, it can be used in common for heating different foods, and manufacturing costs can also be reduced in this respect.

(F) Embodiment FIGS. 1 to 6 show an embodiment in which the heating device of the present invention is applied to a food container for a lunch box.

In FIG. 2, the food container 1 with a heat generating device is constructed by sequentially accommodating a heat generating device 4 in an outer container 2 and a food tray 3 for storing cooked rice, side dishes, etc., and the heat generating device 4 generates water vapor. This water vapor can heat the food in the food tray 3.

The outer container 2 consists of a container body 2a that is a molded product of heat-resistant foamed plastic and a lid 2b formed by blow molding. It is formed to support. A tongue-shaped steam escape port 6 is cut into the center of the top surface of the lid body 2b.

The food tray 3 is a press-molded product of an aluminum sheet, and in the embodiment shown in the figure, the walls are non-porous except for a steam introduction lower portion at the upper periphery of the tray, which will be described later. This retention space 8 is filled with steam heated to several hundred degrees, and the walls of the tray are heated by radiant heat from the heat source and high-temperature steam, and the food is heated by heat conduction through the walls. It has a heating configuration. In addition,
A heating method may be used in which a number of steam passage ports are provided in the bottom wall of the tray 3 to bring the steam into direct contact with the food, but in this case, the steam generated by the hydration reaction will be introduced into the tray 3 without raising the temperature. , the food can only be heated to around 100 degrees. Further, the interior of the tray body 3 may be divided into a plurality of sections to facilitate the arrangement of foods.

In the illustrated embodiment, in order to introduce a portion of the high-temperature steam in the retention space 8 to the inner upper surface of the food tray 3, a plurality of introduction lowers are provided at the flange portion 3C at the upper peripheral edge of the tray as shown in FIG. Hypermembrane. Therefore, in this embodiment, the high-temperature steam that entered the tray from the introduction lower
The food is also heated from the top side. The heated water vapor is discharged to the outside of the outer container from an outlet 6 opened on the top surface of the lid 2b. It goes without saying that the introduction lower may be provided at the upper end of the side wall 3a of the tray 3.

The heating device 4 is a water container 1 filled with a heating material 9 and reaction water 10.
1, a heat generating container 12 that accommodates these, an incision means 13, etc., and the whole is constructed as a single sealed unit. The heat-generating container 12 is made of a molded product of a moisture-proof plastic material, such as polypropylene mixed with calcium carbonate as a filler, and has a sealing flange 15 projecting along the opening edge of its upper surface. Granular or solidified heat generating material 9 is housed in this heat generating container 12, its upper surface is covered with a filter sheet 16 made of non-woven fabric, and the water container 11 is placed on the filter sheet 16.

The heat generating material 9 is a substance that generates heat during a hydration reaction, such as calcium oxide or calcium chloride, and the reaction water 10
In this example, granular calcium oxide was used as the heat generating material 9, and an aqueous magnesium chloride solution was used as the reaction water 10.

The water container 11 includes a dish-shaped container body 17 with an open top surface;
It consists of a seal body 1B that closes the opening surface of this, and its shape is determined so that it fits perfectly into the heat generating container 12. The container body 17 is formed by blow molding or the like using a sheet of polypropylene or the same filler-containing polypropylene as the heat-generating container 12, and has a certain degree of self-retention property. A sealing wall 19 protrudes from the periphery of the opening of the container body 17 in a flange shape corresponding to the flange 15 of the heat generating container 12 . The seal body 18 is attached to the container body 1
It is made of a sheet or film made of the same material as 7, and is welded and fixed to the seal wall 19 in a state that closes the opening surface of the container body 17, thereby sealing the reaction water 10 accommodated in the container body 17.

Water container sealed and filled with reaction water 10 as described above]1
By assembling the heat generating container 12 so that the seal wall 19 is received and supported by the flange 15, and fixing the seal wall 19 to the flange 15 by welding in this state, the heat generating material 9 housed in the heat generating container 12 can be heated. Seal. A weld line 20 for this sealing is shown in FIG. By sealing the heat-generating container 12 with the seal wall 19, the heat-generating material 9 is completely isolated from the outside, so that no functional deterioration occurs even when stored for a long period of time.

A cutting means 13 is provided to cut open the water container 11 and simultaneously release the sealed state of the heat generating material 9 during use. 1 and 3, the cutting means 13 consists of a plastic tape whose negative end is connected to the sealing wall of the water container 11.
Invert the periphery of the seal body 18 so as to sandwich it vertically,
This inverted portion is welded and fixed to each of the seal wall 19 and the seal body 1B, and the other end side is positioned on the upper surface of the water container 11. Note that the cutting means 13 is the flange 1 of the seal wall 19.
5, and there is no gap between the seal wall 19 and the flange 15 at the tape reversal portion (see FIG. 4).

In order to ensure the incision of the water container 11, V-shaped incisions 21 are formed on both sides of the inverted portion of the incision means 13. Furthermore, the position and direction of the cut 21 in the container body 17 and the seal body 18 are specified so that the stretching direction of the material sheet (or film) matches the cutting direction of the cutting means 13. If necessary, an incision means 1 is provided on at least one of the container body 17 and the seal body 18.
An incision line may be formed along the incision direction No. 3.

This incision line is formed to be thinner than other parts, and is formed in the shape of a perforation or a continuous line.

As shown in FIG. 2, when the heating device 4 is housed in the outer container 2, the cutting means 13 extends from the bottom wall of the food tray 3 to the side wall, and extends outside the container through the stepped portion 5 of the outer container 2. I have derived it.

In the food container 1 with a heating device configured as described above, the heating device 4 is sealed as an independent member, so that water vapor comes out from the food in the food tray 3 and fills the outer container 2. Even if something happens, the heat generating material 9 will remain dry and its functionality will not be impaired. Further, even if the food container 1 is turned over or dropped before the food is placed on the food tray 3, the heat generating material 9 can be prevented from being scattered inside the outer container 2.

When reheating food, by pulling the cutting means 13 out of the container while holding and supporting the outer container 2, the weld line 20 between the water container 11 and the 7-lunge 15 is destroyed, and the heat-generating material 9 is The sealed state is released. The incision is seal body 1
At the same time as the reaction water in the container body 17 flows out and contacts the exothermic material 9, a hydration reaction starts. By sufficiently pulling the cutting means 13 out of the outer container 2, both the container body 17 and the sealing body 18 are torn apart in the radial direction, and the reaction water 10 inside is surely flowed out.

The reaction water 10 that has flowed out comes into contact with the exothermic material and causes a hydration reaction, and a part of it is vaporized by the heat of reaction and flows into the seal body 13.
Sprays out from the incision, into the retention space 8 and the food tray 3.
It fills the inside and heats the food.

As described above, when the heating device 4 is constructed as a single independent member, it can be used for heating other foods. For example, as shown in FIG. 6, when delivering a pizza 22, a heating device 4 is placed on the bottom surface of the tray 23 on which the pizza 22 is placed, and the steam generated by the heating device 4 is used to heat the pizza 22.
It keeps it warm. The tray 23 is formed by press-molding an aluminum sheet, and has a circular engagement protrusion 24 projecting from the inner surface of the central portion to fit onto the heating element 4. 25 is a paper box for home delivery, in which a tray 23, a heating device 4 and a pizza 2 are placed.
Accommodates 2.

In addition, when keeping food warm or reheating food served on a ceramic or metal plate, the heat generating device 4 is fitted into the bottom of the plate using the thread tail of the Seiwang to generate steam. You can also.

(G) Modification The water container 11 may be formed in the shape of a bag, and in short, as long as the peripheral wall thereof is provided with a sealing wall 19 that can be fixed to the opening edge 15 of the heat-generating container 12, the structure and shape are sufficient. can be set freely. For example, when filling a rectangular bag with the reaction water 10, a seal wall 19 is extended around the periphery and made to approximately match the shape of the flange 15 of the heat generating container 12.

The incision means 13 can also be formed of a string-like material, so it is not limited to tape.

When both are made of plastic, it is preferable to fix the water container 11 and the heat generating container 12 by welding or adhesion.
When the heat generating container 12 and the water container 11 are formed of other materials such as a composite plastic sheet laminated with aluminum liquor, the two can be joined and fixed by adhesive or rolling.

As explained above, in the present invention, the heat generating container 12 in which the heat generating material 9 is housed is sealed using the water container 11, and the heat generating device 4 is configured as one independent sealed unit. Therefore, the heat generating material 9 can be stored for a long period of time without functional deterioration, and the hydration reaction can be started simply by cutting open the water container 11, which improves long-term storage and use. It is possible to simultaneously satisfy both the time and handling characteristics.

Further, by configuring the heating device 4 as a single independent member, it can be used to heat different foods depending on the size thereof, improving its versatility and reducing manufacturing costs. In general, the cost can be reduced by using the water container 11 as a sealing member, so the overall manufacturing cost can be reduced.

Since the heating element 4 itself is sealed, for example, when it is applied to a food container for a lunch box, the function of the heating element 9 may be deteriorated by water vapor generated from the food, or the seal may be broken during handling. It can be resolved.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of a heating device of the present invention, FIG. 2 is a vertical cross-sectional view of a food container with a heating device, and FIG. 3 is a plan view of the main parts of the heating device.
FIG. 4 is a view in the direction of arrow A in FIG. 1, and FIG. 5 is a longitudinal cross-sectional view showing the main structure of the food tray. FIG. 6 is an exploded perspective view showing an example of a repurposed heating device. 1... Food container with heating device, 2...
・・・・・・Outer container, 3・・・・・・Food tray 4・・・・・・Heating device, 9・・・・・・・・・
・Heating material, 10... Reaction water,...
...Water container, 12... Heat generating container, ...
・Incision means, 17... Container body,...
・Seal body, 19...Seal wall. 11... 13... 18...

Claims (3)

[Claims] (1) Consisting of a heat generating container 12 with an open top surface, a heat generating material 9 housed in this container 12, and a water container 11 filled with reaction water 10, the water container 11 is fixed to the opening edge of the heat generating container 12. Heat generating material 9
A heating device characterized by sealing. (2) The heating device according to claim 1, further comprising an incision means 13 fixed to the water container 11 for cutting the water container 11 and simultaneously releasing the sealed state of the heat generating material 9. (3) The water container 11 includes a dish-shaped container body 17 that accommodates the reaction water 10, and a seal body 1 that closes the opening surface of the container body 17.
8. The heating device according to claim 1 or 2, comprising: