JP3070663U - Insulated lunch box - Google Patents

Abstract

(57) [Abstract] [Problem] To provide an insulated lunch box that can provide catering lunches for station lunches and group customers as warm as possible. A heat insulating material that generates heat by an oxidation reaction of iron powder or the like is housed in an inner bottom of an outer container having an openable and closable lid. The soleplate 3 is arranged on the heat retaining agent 2, and the inner container 5 containing the cooked food is accommodated thereon. In the laying plate arranged on the heat insulating agent, for example, a plurality of spaces partitioned between the heat insulating agent and the inner container are formed by perforating a plurality of vertically long through holes 4 and 4 in corrugated paper. Use things.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention is mainly a paper lunch box, which is mainly provided to customers as station lunches, over-the-counter lunches, or catering lunches. The present invention relates to an insulated lunch box devised so that it can be provided.

[0002]

[Prior art]

 The lunch box for eating cooked foods in a warm state is cooled using a lunch jar that is insulated so that hot foods do not cool down, or a heating agent that uses the heat of hydration reaction of quicklime. There are known cooked foods that can be reheated. Japanese Utility Model Laid-Open No. 60-187618 and Japanese Utility Model Laid-Open No. 59-23329 describe the design of a lunch box using a heat insulating agent that utilizes heat generated by an oxidation reaction of iron powder or the like.

[0003]

[Problems to be solved by the invention]

 Conventional insulated containers such as lunch jars can be used repeatedly, but because of their complicated and expensive structure, they cannot be used as containers for station lunches or over-the-counter lunches. In addition, reheated containers that use the heat of hydration reaction of quick lime may cause burns due to rapid heating and high temperatures, and may also inadvertently cause the hydration reaction. There was a possibility. Also, the method of reheating the whole bento once cooled is relatively expensive and uneconomical. Further, in the lunch box disclosed in Japanese Utility Model Laid-Open No. 60-187618 and Japanese Utility Model Laid-Open No. 59-23329, a reaction of the heat insulator is carried out in a state where a space is held under the heat insulator, and the heat insulator is reacted with the heat insulator. The inner container containing the cooked food was in an outer container in contact with it. Therefore, there has been a drawback that heat generated by the oxidation reaction easily escapes from below, and it is difficult to realize a stable heat retaining state.

[0004] In view of such circumstances, the present invention uses a relatively inexpensive heat retaining agent that utilizes heat generated by an oxidation reaction of iron powder or the like, and can cook and cook cooked food for as long as possible. It is an object of the present invention to provide an insulated lunch box which can be stably maintained in a warm state and can economically realize a bento that can be eaten in a freshly warmed state.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention accommodates a heat insulator 2 which generates heat by an oxidation reaction in the inner bottom of an outer container 1 having a lid which can be opened and closed. The soleplate 3 is arranged on the heat insulator 2 and the inner container 5 containing the cooked food is accommodated thereon. The floor plate 3 arranged on the heat insulating agent 2 forms a plurality of spaces defined between the heat insulating agent and the inner container by forming through holes in the floor plate of a certain thickness. The floor plate 3 may be, for example, a corrugated paperboard having a predetermined thickness and a plurality of vertically long through holes 4 and 4 formed in a corrugated shape.

[0006]

[Embodiment of the invention]

 Hereinafter, an example of the insulated lunch box according to the present invention will be described with reference to the accompanying drawings. FIG. 1 is an exploded perspective view of the entire heat insulation lunch box, FIG. 2 is a longitudinal sectional view of the heat insulation lunch box shown in FIG. 1, and FIG. 3 is a longitudinal section showing a state where a plurality of heat insulation lunch boxes are accommodated in a large packaging box and transported. FIG.

[0007] The inner bottom of an outer container 1 having an openable and closable lid 1a and decorated or printed as a station valve or a cat lunch is mixed with iron powder and an oxidation promoter, which are usually used as a pocket warmer. And heat insulators 2, 2 utilizing heat generated by the oxidation reaction of iron powder. On the heat insulators 2, 2, there is arranged a floor plate 3 formed in a corrugated shape by drilling a plurality of vertically long through holes 4, 4 in corrugated paper. An inner container 5 containing cooked food is placed on a floor plate 3 placed on the heat insulator 2, and an inner lid 6 such as cardboard is placed on an upper end of the opened inner container. Can be closed with the lid 1a of the outer container 1. The inner lid 6 placed on the inner container exhibits auxiliary heat-retention and hardening, and preferably has a certain degree of heat retention. For example, general cardboard is used.

[0008] The most important point in the present invention is that the floor plate 3 is placed on the heat insulating agent 2 and the inner container containing the prepared food is placed thereon, and the floor plate placed on the heat insulating agent Is that a plurality of spaces are formed between the heat insulator and the inner container by the through holes 4 and 4.

Since the heat of the heat insulator is generated by an oxidation reaction of iron powder or the like, it is necessary to supply a certain amount of fresh air (oxygen). In the present invention, the air in the outer container 1 is supplied to the heat insulating agent 2 from the through hole 4 of the floor plate 3, and the air in the through hole formed by the floor plate is heated by an oxidation reaction, Heat the food contained in the inner container. Since the air required for the oxidation reaction is not supplied from the lower part of the heat insulating agent in contact with the bottom plate 1b of the outer container 1, little heat escapes to the lower part of the outer container, and most of the heat generated by the heat insulating agent 2 Will be consumed to heat the food.

[0010] As the floor plate disposed on the heat insulating agent 2, a plate having a large number of through holes formed in a flat plate, or a plate having a through hole formed in a honeycomb shape can be used. A corrugated paperboard of a certain thickness is used, and a plurality of vertically long through-holes 4 and 4 are formed in the corrugated paperboard to make a shape of a cage. In such a case, the inner container can be firmly supported by the strength of the corrugated paper, and the heat generated by the heat insulating agent heats the air in the space formed by the through-holes 4 and the portions other than the through-holes. The space of corrugated paper has a heat-insulating structure, making it a soleplate with excellent heat-insulating function.

In the present invention, since the heat retaining agent and the inner container are not in contact with each other, the heat of the heat retaining agent is not directly transmitted to the inner container. Therefore, even if the temperature of the heat retaining agent is rapidly increased due to a rapid oxidation reaction, there is no possibility that the food in the inner container is overheated and deteriorated. Then, an oxidizing reaction of the heat retaining agent is performed by the oxygen of the air in the space formed by the through holes 4, and the air heated by the oxidizing reaction indirectly heats the cooked food stored in the inner container 5.

That is, the heat generated by the heat retaining agent 2 is not directly transmitted to the inner container, but heats the air in the space of the through hole of the floorboard, and this heat is transmitted to the inner container and the air in the space of the corrugated paper itself. Is also heated. Therefore, the entire bottom of the inner container is heated evenly. Thus, in the present invention, the heat of the heat insulating agent can be used efficiently.

[0013] The heat generation temperature of the heat retaining agent 2 can be selected variously depending on, for example, the combination with the oxidation promoter, and the heat retaining agent used according to the present invention is, for example, one that generates heat to about 80 degrees Celsius. Good. The temperature of food prepared as a station lunch or catered lunch immediately after cooking is usually around 80 degrees Celsius. In other words, the temperature heated by the heat insulator and the temperature of the food immediately after cooking are almost in balance, and the heat radiated from the entire container is replenished by the heat generated by the heat insulator, so the heat insulation efficiency is extremely high. According to the study of the present inventors, it was possible to maintain the food at a temperature of 50 degrees or more, which is the temperature at which food can be eaten, for 4 to 5 hours by using the above-mentioned heat insulating agent.

In other words, if the food is delivered or sold within 4 to 5 hours after cooking, the customer can be provided with a warm lunch. Therefore, the present invention is extremely effective when used for lunches and the like that consumers eat within at least several hours, and for the purpose of keeping warm for more than a few hours and reheating food that has been cooled once. Not for use. In addition, since the temperature of the cooked food is maintained as high as possible, it is also effective for supplying not only grilled and boiled foods but also stewed dishes as lunches.

FIG. 3 is a cross-sectional view showing a state in which a lunch box using the heat retaining lunch box according to the present invention is accommodated in a large packaging box 7 and transferred. In the insulated lunch box of the present invention, an insulated box 2 as a heat source is stored in each of the lunch boxes. Therefore, for example, a cardboard box or the like having good heat insulation is used as the packaging box 7, and when a large number of lunch boxes are accommodated in this packaging box, the temperature in the packaging box is reduced by the heat radiated from the individual lunch boxes. It can be maintained at a high temperature, and it is possible to keep the heat for a long time more effectively.

[0016]

[Effect of the invention]

 According to the insulated container for heated food according to the present invention as set forth in claim 1, the station valve is supplied for several hours from the manufacturing to the consumer by the heating agent utilizing the oxidizing heat of metal which generates mild heat without using water. And cat lunches can be effectively maintained at a constant high temperature and served in a hot, ready-to-eat state. Further, since the cooked food and the inner container itself do not come into contact with the heat insulating agent, there is no possibility that the food and the inner container are overheated. Much of the heat generated by the heat retaining agent is transmitted to the air in the space formed by the through holes in the floor plate, and the bottom of the heat retaining agent has poor circulation of air. Less. In addition, the present invention does not reheat food that has been cooled by the conventional heat of hydration of quicklime, so it is safe and sanitary with no extremely high temperatures or generation of water vapor.

According to the invention of claim 2, it is possible to provide the cardboard paper at low cost by using a corrugated cardboard having a through hole as a sole plate, and to provide a suitable heat insulation due to the structure of the corrugated cardboard itself. It is possible to provide a heat-insulating lunch box that realizes a heat-resistant flooring plate and has an excellent heat-insulating effect.

[Submission date] February 1, 2000 (2000.2.1)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0003

[Correction method] Change

[Correction contents]

[0003]

[Problems to be solved by the invention]

Conventional insulated containers such as lunch jars can be used repeatedly, but because of their complex and expensive structure, they cannot be used as containers for station lunches or over-the-counter lunches. In addition, reheated containers that use the heat of hydration reaction of quick lime may cause burns due to rapid heating and high temperatures, and may also inadvertently cause the hydration reaction. There was a possibility. A method of reheating a whole once cooled and lunch is uneconomical at a relatively high cost. Also, in the lunch box disclosed in Japanese Utility Model Application Laid-Open No. 60-18876 and Japanese Utility Model Application Laid-open No. 59-23329, the reaction of the heat insulating agent is carried out in a state where the space is held under the heat insulating agent, and the heat insulation is performed. The inner container containing the cooked food in contact with the agent was contained in an outer container. Therefore, there is a disadvantage that heat generated by the oxidation reaction easily escapes from below, and it is difficult to realize a stable heat retaining state.

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0016

[Correction method] Change

[Correction contents]

[0016]

[Effect of the invention]

According to the insulated container for heated food according to the present invention as set forth in claim 1, the station valve is supplied for several hours from the production to the consumer by the heating agent utilizing the heat of oxidation of metal which generates mild heat without using water. And cat lunches can be effectively maintained at a constant high temperature and served in a hot, ready-to-eat state. Further, since the ones cooked food and the inner container its taking into inner container does not contact the heat retaining agent, there is no possibility that food and the inner container is over-heated. Much of the heat generated by the heat insulator is transmitted to the air in the space formed by the through holes in the bottom plate, and the heat at the bottom of the heat insulator is radiated directly from the bottom plate of the outer container to the outside because the air flow is poor. Less. In addition, the present invention does not reheat food that has been cooled by the conventional heat of hydration of quicklime, so it is safe and sanitary with no extremely high temperatures or generation of water vapor.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an example of an insulated lunch box according to the present invention;

FIG. 2 is a longitudinal sectional view of the heat-insulated lunch box according to the present invention;

FIG. 3 is a vertical cross-sectional view showing a transported state in which a plurality of heat retaining lunch boxes are accommodated in a large pox box.

[Explanation of symbols]

1 ... outer container, 1a ... lid, 1b ... bottom plate, 2 ... heat insulator,
3 ... bottom plate, 4 ... through hole, 5 ... inner container, 6 ... lid plate,
7 ... Packing box.

[Procedure amendment]

[Submission date] February 1, 2000 (2000.2.1)

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] Figure 3

[Correction method] Change

[Correction contents]

FIG. 3 is a longitudinal sectional view showing a transfer state in which a plurality of heat retaining lunch boxes are accommodated in a large packaging box.

Claims (2)

[Utility model registration claims] 1. An outer container provided with an openable / closable lid,
A heat insulating agent that generates heat due to the oxidation reaction is housed, a floor plate is placed on the heat insulating agent, and an inner container that stores cooked food is housed thereon, and the floor plate is provided with a through hole to provide a heat insulating agent. A warm lunch box characterized by forming a plurality of spaces between the inner container and the inner container. 2. The heat-insulated lunch box according to claim 1, wherein the floor plate disposed on the heat-insulating material is a corrugated cardboard formed by forming a plurality of vertically long through-holes into a shape of a cage.