JP2009240364A - Food heating container - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a food heating container which can uniformly heat food. <P>SOLUTION: The food heating container includes a heating tool having a food tray 11, a watertight container 15 storing an exothermic agent heating by contacting water arranged in the lower side of the food tray and a tearable water bag inside, and covering the top face with the tearable film 14, and a long opening tool 16 tearing and opening the tearable film of the watertight container and the water bag, a box 18 storing the food tray and the heating tool, and the lid 19 of the box, and makes the tip of the long opening tool penetrate the sidewalls of the box and is drawn out of the box. The food tray is supported by the box with the clearance formed between the bottom of the food tray and the periphery of the top face of the heating tool and the clearance formed between the top of the sidewalls of the food tray and the underside of the lid, respectively, and forms a gas passage 22 connecting both clearances is formed between the sidewalls of the food tray and the box. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a food heating container provided with a heating tool.

  Conventionally, food heating containers equipped with heating tools have been used to heat food such as lunch boxes before meals.

  Patent Document 1 discloses a food tray; a heating agent disposed on the lower side of the food tray, which generates heat when contacted with water and an easily tearable water bag are contained therein, and an upper surface is an easily tearable film ( A heating device (heating device) comprising a watertight container covered with a protective sheet, and an elongate opening device (tear tape) for tearing and opening the easily tearable film and water bag of the watertight container; food tray and heating There is disclosed a food heating container (container for portable food) including a box (container body) having an opening at the upper end and containing a lid; and a lid for closing the opening of the box. The tip of the opening of the food heating container penetrates the side wall of the box of the food heating container and is drawn out of the box.

  The box, the food tray, and the lid of the food heating container are produced by molding a film formed of a resin material such as polyvinyl chloride resin, styrene resin, or polypropylene resin with a vacuum molding machine.

  And, when the user pulls the tip of the opening tool pulled out outside the box of the food heating container before eating, the easy tearing water bag is torn together with the easy tearing film of the watertight container by the opening tool, Water flows out of the water bag. The food (for example, lunch box) stored in the food tray is heated by the heat generated by the reaction between the water and the heat generating agent or by high-temperature steam. In this food heating container, the food stored in the food tray is heated by the high-temperature steam coming into contact with the lower surface and the outer side surface of the food tray.

In the food heating container (lunch box) of Patent Document 2, a food tray in which a plurality of water vapor permeable holes are formed is used. The hole is formed in each of the bottom surface of the food tray and the top surface of the partition plate that partitions the inside of the food tray. The food tray is supported at the top of the peripheral wall of the box at its peripheral edge. This food heating container heats the food stored in the food tray by bringing hot steam into contact with the lower surface and the outer side surface of the food tray. Furthermore, this food heating container heats the food contained in the food tray by bringing it into contact with high-temperature steam that has permeated through the hole on the bottom surface of the food tray or the hole on the top surface of the partition plate.
JP 2006-346329 A JP 2007-259966 A

  The food heating container of the above-mentioned Patent Document 1 indirectly heats the food contained in the food tray by contacting the high-temperature steam generated by the heating tool to heat the food tray. In the case of such a heating method, there is a problem that the food that comes into contact with the bottom plate or the side wall of the food tray is easily heated, and thus it is difficult to uniformly heat the food stored in the food tray.

  The food heating container of Patent Document 2 not only indirectly heats the food contained in the food tray as in the case of the food heating container of Patent Document 1, but also has a hole or partition on the bottom surface of the food tray. It is also heated directly in contact with the high-temperature water vapor that has passed through the hole on the top surface of the plate. Therefore, the food in the vicinity of the hole on the bottom of the food tray is efficiently heated by contact with the high-temperature steam that has passed through the hole, and the upper surface portion of the food is the hole on the top surface of the partition plate. Heated efficiently by contact with high-temperature water vapor that has passed through the part. However, since the hole at the bottom of the food tray is blocked by food, the high-temperature water vapor that has permeated through the hole hardly reaches the upper surface portion of the food. For this reason, the food in the vicinity of the hole on the bottom surface of the food tray is likely to be partially heated. Moreover, since the high temperature water vapor which permeate | transmits the hole of the top surface of the partition plate of a food tray is a small amount, it is difficult to fully heat the upper surface part of a foodstuff. For this reason, there is a problem that it is difficult to uniformly heat the food contained in the food tray by the food heating container of Patent Document 2.

  The subject of this invention is providing the food heating container which can heat the foodstuff accommodated in the food tray uniformly.

The present invention includes a food tray; a heating agent disposed on the lower side of the food tray, which generates heat upon contact with water and an easily tearable water bag, and has an upper surface covered with an easily tearable film. A heating device comprising a watertight container, a tearable film of the watertight container and a long opening device for tearing and opening the water bag; a box having an opening at the upper end, containing the food tray and the heating device A food heating container including a body; and a lid that closes the opening of the box, and the leading end of the elongated opening member is drawn out of the box through the side wall of the box And
The food tray is formed by a box with a gap formed between the bottom surface of the food tray and the peripheral edge of the upper surface of the heating tool, and between the top of the side wall of the food tray and the lower surface of the lid. The food heating container is characterized in that a gas passage connecting the gap between the two is formed between the side wall of the food tray and the box.

Preferred embodiments of the food heating container of the present invention are as follows.
(1) The box includes a support that supports the food tray in a state where a gap for forming the gas passage is formed.
(2) The box is made of paper. More preferably, the box is supported by being fitted to the inside of the outer box in a raised bottom state with a cylindrical outer box in which the area of the lower end opening is smaller than the area of the upper end opening. It consists of an inner box with an opening at the upper end.
(3) The outer box is composed of a corrugated cardboard sheet having a striped uneven surface exposed to the outside.
(4) The length direction of the stripes on the uneven surface is arranged in a direction inclined with respect to the bottom side of the outer box.
(5) The elongate opening tool penetrates the side wall of the box body from the side of the leading end drawn out of the box body to the rear end side of the watertight container opposite to the side wall side. Then, it is inserted into the inside of the watertight container from the rear side of the upper surface of the watertight container, folded back to the front side, and then passed over the water bag from the front side and folded back on the rear side of the waterbag. After passing under the water bag from the front side, folded back on the back side of the water bag and passed over the water bag, the opening device is sandwiched between the upper surface and the lower surface of the water bag It is being fixed to the front side of the support plate with which it was equipped.

  The food heating container of the present invention uses high-temperature water vapor and high-temperature air flowing through a gas passage formed between the side wall and the box of the food tray to convert the food contained in the food tray into the food tray. Heating is also performed from the bottom plate side, the side wall side of the food tray, and the upper side. For this reason, the food accommodated in the food tray can be heated extremely uniformly by using the food heating container of the present invention.

  Next, the food heating container of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a perspective view showing a configuration example of a food heating container according to the present invention. FIG. 2 is an exploded perspective view of the food heating container 10 of FIG. FIG. 3 is an enlarged cross-sectional view of the food heating container 10 cut along the cutting line III-III entered in FIG. 4 is an enlarged cross-sectional view of the food heating container 10 cut along the cutting line IV-IV entered in FIG.

  The food heating container 10 shown in FIGS. 1 to 4 includes a food tray 11; a heat generating agent 12 and an easily tearable water bag 13 which are disposed on the lower side of the food tray 11 and generate heat by contact with water. A heating tool comprising a watertight container 15 whose upper surface is covered with an easily tearable film 14, and a long opening tool 16 for tearing and opening the easily tearable film 14 and the water bag 13 of the watertight container 15. 17; containing the food tray 11 and the heating tool 17; a box 18 having an opening at the upper end; and a lid 19 that closes the opening of the box 18, and the like. The leading end portion 16 a of the opening tool 16 passes through a cut 29 formed in the side wall of the box 18 and is drawn out of the box 18. In the food heating container 10, the food tray 11 is disposed between the bottom surface of the food tray 11 and the peripheral edge of the upper surface of the heating tool 17, and between the top of the side wall of the food tray 11 and the lower surface of the lid 19. A gas passage 22 is formed between the side wall of the food tray 11 and the box 18 so as to connect the gaps 21a and 21b with the gaps 21a and 21b formed. There is a big feature.

  As will be described in detail later, when the distal end portion 16a of the elongated opening device 16 of the food heating container 10 is pulled in the direction indicated by the arrow written in FIG. The watertight container 15 is opened by tearing, and then the easily tearable water bag 13 is torn and opened. The water flowing out of the water bag 13 and the exothermic agent 12 accommodated in the water-permeable bag body 25 come into contact with each other and react to generate high-temperature steam. This high-temperature steam diffuses to the outside of the watertight container 15 from the opening formed in the easy tear film 14 by tearing with the opening device 16.

  As shown in FIG. 3, the food tray 11 of the food heating container 10 has a gap 21 a formed between the bottom surface of the food tray 11 and the peripheral edge of the top surface of the heating tool 17, and the top of the side wall of the food tray 11. It is supported by the box 18 with a gap 21 b formed between the lower surface of the lid 19. A gas passage 22 is formed between the side wall of the food tray 11 and the box 18 to connect the gaps 21a and 21b. For this reason, the high temperature steam diffused to the outside from the watertight container 15 of the heating tool 17 as described above flows into the space between the food tray 11 and the lid body 19 through the gas passage 22.

  By forming such a gas passage 22, the high temperature steam generated in the heating tool 17 first contacts the lower surface of the food tray 11 through the gas passage 22, and then contacts the outer side surface of the food tray 11. Then, it flows into the space between the food tray 11 and the lid 19 and contacts the upper surface portion of the food stored in the food tray 11. Therefore, the food stored in the food tray 11 is heated from the bottom plate side of the food tray 11, the side wall side of the food tray 11, and further from the upper side. For this reason, by using the food heating container 10 of the present invention, the food stored in the food tray 11 can be heated extremely uniformly.

  In the food heating container of Patent Document 2, a hole is formed on the top surface of the partition plate that divides the inside of the food tray, and high-temperature steam generated by the heating tool passes through the hole to produce the food. It flows into the space between the tray and the lid. However, since such a partition plate is a thin one that partitions the inside of the food tray so that a plurality of types of foods are not mixed, the number of holes that can be formed on the top surface of the partition plate is There is a limit. For this reason, it is difficult to allow a sufficient amount of high-temperature steam to flow into the space between the food tray and the lid. Moreover, since the food tray used for accommodating one type of food does not include a partition plate, high-temperature steam cannot flow into the space between the food tray and the lid.

  The box of the food heating container of the present invention is preferably provided with a support that supports the food tray in a state where a gap for forming the gas passage is formed. The box 18 of the food heating container 10 shown in FIGS. 1 to 4 is provided with a support 23 that supports the food tray 11 in a state in which a gap 21c for forming the gas passage 22 is formed.

  As described above, the food tray 11 is supported by the support 23 in a state where the gap 21c for forming the gas passage 22 is formed, so that the food contained in the food tray can be uniformly heated as described above. Is realized, and further, the following excellent effects are exhibited.

  In general, a food container that does not have a heating function includes a food tray and a lid that closes an opening at the upper end of the food tray. The food tray is set in various shapes and sizes depending on the type and amount of food to be stored. For example, a food tray that contains only rice or only a side dish is used in a relatively small size, and a food tray that contains rice and a side dish like a lunch box has a relatively large size. Things are used. In addition, a round tray is used as a food tray for storing a bowl or a cutlet bowl, an elliptical tray is used for storing a curry or spaghetti, and a rectangular tray is used as a tray for storing an inner lunch box.

  Therefore, when a food tray having holes on the bottom surface or the top surface of the partition plate is used as in the food heating container of Patent Document 2, the high-temperature steam that has passed through these holes is used for heating the food. However, it is necessary to prepare a food tray that is set in various sizes and shapes depending on the type and amount of food to be accommodated and that has the holes. A food tray provided with such a hole can be produced by forming a hole in a food tray of a food container having no heating function by machining. However, it is very troublesome to form a hole in the bottom of a food tray formed from a thin film or the top surface of a partition plate by machining, and it is necessary to clean the food tray after machining. is there. It is not practical to perform such machining and cleaning of food trays on a large number of trays set in various shapes and sizes. Moreover, a food tray provided with a hole can be produced using, for example, a vacuum forming machine without performing such machining and washing of the food tray. However, since the food tray is set in various shapes and sizes as described above, it is necessary to prepare many expensive vacuum forming molds.

  When the support tool 23 as described above is used, a food tray (not having a hole) of a food container that does not have a heating function is supported by the support tool 23 and the gas passage 22 is formed. The food heating container 10 can be produced at a low cost.

  Examples of the material for the support include resin materials typified by polyethylene resin and polypropylene resin, and paper materials typified by cardboard and cardboard sheets. Paper materials such as cardboard and cardboard sheets are preferably subjected to water-resistant processing (for example, application or impregnation of wax) in order to suppress a decrease in strength due to contact with high-temperature steam generated by a heating tool. Moreover, in order to improve water resistance, the metal foil represented by aluminum foil or the resin film can also be laminated | stacked on the surface of paper material.

  The support tool 23 shown in FIGS. 2 to 4 is configured by bending a single cardboard sheet. Such a support 23 is easy to assemble, and can be stored in a small space by stacking a large number of supports in a developed state. Moreover, the generation amount of the resin waste at the time of discarding the food heating container after use can be reduced.

  The support 23 includes a pair of side wall portions 23a and 23b each formed by bending a corrugated cardboard sheet into a mountain shape, and a connecting portion 23c that connects the side wall portions 23a and 23b to each other. The side wall part 23 a includes a notch part 23 d for allowing the opening tool 16 of the heating tool 17 to pass through. Further, the side wall portion 23 b includes a protruding portion 23 e that prevents the heating tool 17 from moving.

  And these side wall parts 23a and 23b are stably supported by the connection part 23c. For this reason, the food tray 11 is stably supported by the side walls 23a and 23b in a state where the gas passage 22 is formed. The connecting portion 23 c also has a function of suppressing heat transfer from the heat generated by the heating tool 17 to the bottom surface side of the box 18.

  In order to increase the amount of high-temperature water vapor that flows into the space between the food tray and the lid, the support is used to make the food tray 30 to 100% (preferably 45%) of the circumferential length of the outer peripheral edge of the upper surface. It is preferable that a portion having a length within a range of ˜100%) is supported in a non-contact state on the inner wall surface of the box. As shown in FIGS. 3 and 4, the support 23 causes the food tray 11 to have the entire outer peripheral edge portion (the portion having a length of 100% of the circumferential length of the outer peripheral edge portion) of the upper surface of the food tray 11. If the inner wall surface of the food tray 11 is supported in a non-contact state, a sufficient amount of high-temperature steam for heating the food is introduced into the space between the food tray 11 and the lid 19 from the outer peripheral edge of the upper surface of the food tray 11. Can flow in.

  When the support 23 is not used, for example, a food tray having a plurality of holes formed in a flange extending outward from the peripheral edge of the upper end opening of the food tray is prepared. The gas passage can be formed by supporting the peripheral edge of the upper end opening of the box at a position outside the plurality of holes. However, it is necessary to prepare such a food tray in advance.

  In the food heating container of the present invention, as the material of the box that houses the food tray and the heating tool, a known food container or a resin material or paper material forming the box of the food heating container can be used. This box is particularly preferably made of paper. A paper box 18 is used in the food heating container 10 shown in FIGS.

  As described above, the food tray is set in various sizes and shapes depending on the type and amount of food to be stored. For this reason, the box which accommodates a food tray is also set to various sizes and shapes according to the food tray. In order to produce this box with, for example, a vacuum forming machine using a resin material, it is necessary to prepare a large number of expensive vacuum forming molds according to the shape and size of the box. Using a paper box eliminates the need for a large number of expensive vacuum molds and greatly reduces the amount of resin waste generated when the food heating container is discarded after use. it can.

  As shown in FIGS. 1 to 4, the paper box 18 includes a cylindrical outer box 18a in which the area of the lower end opening is set smaller than the area of the upper end opening, and the outer box 18a. It is preferable that it is comprised from the inner box 18b which is fitted and supported by the raised bottom state inside, and is provided with the opening part in the upper end. Thereby, since the side wall of the box 18 is comprised from the double wall body of the side wall of the outer box 18a, and the side wall of the inner box 18b, since heat transfer in the side wall of the box 18 is suppressed, a user is It is possible to suppress the occurrence of burns or discomfort when the outer side surface of the outer box 18a is touched by hand while the food is heated. And even when the food heating container 10 is placed on a resin table with low heat resistance, for example, the inner box 18b that becomes high temperature during heating of the food does not come into contact with the surface of the table. Softening of the table surface can be prevented. If the area of the lower end opening is set smaller than the area of the upper end opening of the outer box 18a, the inner box 18b is inserted into the upper end opening of the outer box 18a by a simple operation. The box 18b is supported on the inner wall surface of the outer box 18a, and the raised bottom box 18 can be easily produced.

  In the case of the food heating container 10, the transfer of heat generated by the heating tool 17 to the bottom surface of the inner box 18 b is suppressed by the connecting portion 23 c of the support tool 23. In order to effectively suppress this heat transfer, a cardboard sheet or the like can be further inserted between the support 23 and the bottom surface of the inner box 18b. Further, a bottom plate can be attached to the outer box 18a so that the user does not touch the bottom surface of the inner box 18b while heating the food.

  As shown in FIG. 1, the outer box 18a is composed of a corrugated cardboard sheet (generally referred to as a single-sided corrugated cardboard sheet) whose striped uneven surface is exposed to the outside. Thus, even when the user touches the uneven surface of the outer box 18a (the center of the single-sided cardboard sheet) while heating the food, the user's hand and the uneven surface of the outer box 18a are in contact with each other. Since the area is small and heat is not easily transmitted to the user's hand, the safety of the food heating container is further improved. Further, the user can stably pull the long opening device 16 with the other hand while the user reliably supports the food heating container 10 with the uneven surface of the outer box 18a with one hand.

  It is preferable that the length direction of the stripes of the uneven surface, that is, the length direction of the flute of the single-sided cardboard sheet is arranged in a direction inclined with respect to the bottom side of the outer box 18a. If the length direction of the stripes on the uneven surface is arranged perpendicular to the bottom of the outer box 18a, the strength of the outer box 18a against the load in the vertical direction increases. However, the strength of the connecting portion between the side walls adjacent to each other of the outer box 18a tends to be reduced (the outer box is easily broken at the connecting portion). On the other hand, if the length direction of the stripes on the uneven surface is arranged in parallel to the bottom of the outer box 18a, the strength of the outer box 18a against the load in the vertical direction is lowered. And as mentioned above, when the length direction of the stripes on the uneven surface is arranged in a direction inclined with respect to the bottom of the outer box 18a, the strength of the outer box 18a against the load in the vertical direction and the outer box 18a The strength at the connection portion between the adjacent side walls can be set to a practically sufficiently high strength.

  The acute angle formed by the length direction of the stripes on the uneven surface and the bottom surface of the outer box is preferably in the range of 2 to 80 degrees, and more preferably in the range of 3 to 45 degrees. If this angle is too large, the angle between the side of the outer box between adjacent walls and the wall and the length direction of the stripes on the concave and convex surfaces becomes small. When trying to bend, the corrugated cardboard sheet may be bent at the concave portion of the uneven surface.

  FIG. 5 is a cross-sectional view showing another configuration example of the food heating container of the present invention. 6 is an exploded perspective view of the food tray 51 and the support 63 provided in the food heating container 50 of FIG.

  The food heating container 50 is configured such that the box 18 is provided with a support 63 made of a single-sided cardboard sheet that supports the food tray 51 in a state in which a gap 61c for forming the gas passage 62 is formed. And it is the same as that of the food heating container 10 of FIG. 3 except the cardboard food tray 51 being used. The gap 61 c is formed between the side wall of the food tray 51 and the concave portion of the concave and convex surface of the single-sided cardboard sheet that constitutes the support 63.

  In the food tray 51 of the food heating container 50, a gap 61 a is formed between the bottom surface of the food tray 51 and the peripheral edge of the upper surface of the heating tool 17, and the top of the side wall of the food tray 51 and the lower surface of the lid 19 Is supported by a support 63 provided in the box 18 with a gap 61b formed therebetween. A gas passage 62 is formed between the side wall of the food tray 51 and the box 18 to connect the gaps 61a and 61b. For this reason, the high temperature steam diffused to the outside from the watertight container 15 of the heating tool 17 as described above flows into the space between the food tray 51 and the lid body 19 through the gas passage 62.

  By forming such a gas passage 62, the food stored in the food tray 51 is heated from the bottom plate side of the food tray 51, the side wall side of the food tray 51, and further from the upper side. For this reason, by using the food heating container 50, the food stored in the food tray 51 can be heated extremely uniformly.

  The food heating container 50 has an advantage that the support 63 used for configuring the gas passage 62 can be easily manufactured by folding a single-sided cardboard sheet.

  Moreover, as the food tray of the food heating container of the present invention, a known food container or a food tray made of a resin material provided in the food heating container can be used. A paper food tray 51 as shown in FIG. By using it, the generation amount of the resin waste at the time of discarding the food heating container after use can be reduced.

  FIG. 7 is an exploded perspective view showing still another configuration example of the food heating container of the present invention. 8 is a cross-sectional view of the food heating container 70 cut along the cutting line VIII-VIII entered in FIG. However, the food heating container 70 in FIG. 7 is filled in with the lid 79 of the box 78 closed.

  The structure of the food heating container 70 is that the box body 78 and the lid body 79 are integrally formed, and that a large-size food tray 71 capable of accommodating a relatively large variety of foods is used. And it is the same as that of the food heating container 10 shown in FIGS. 1-4 except that the structure of the support tool 83 which supports the food tray 71 differs.

  The support 83 is configured by bending a single cardboard sheet. Such a support 83 is easy to assemble, and can be stored in a small space by stacking a large number of supports in a developed state. Moreover, the generation amount of the resin waste at the time of discarding the food heating container after use can be reduced.

  The support 83 includes a total of four side wall portions 84 each having an opening 84a through which high-temperature water vapor generated in the heating device 17 is transmitted, and leg portions 85 that extend outward from the lower ends of the side wall portions 84. It is configured. The arrangement of the side walls 84 inside the box 78 is fixed by these legs 85. For this reason, the food tray 71 is supported by the support 83 in a state where a gap 81c for forming the gas passage 82 is formed.

  The support tool 83 supports the food tray 71 on the top surfaces of the four side wall portions 84 in total. For this reason, the deformation | transformation (for example, bending) of the food tray 71 at the time of accommodating many kinds of foodstuffs can be suppressed by using the support tool 83. FIG.

  The food tray 71 of the food heating container 70 has a gap 81 a formed between the bottom surface of the food tray 71 and the peripheral edge of the upper surface of the heating tool 17, and the top of the side wall of the food tray 71 and the lower surface of the lid 79. It is supported by a support 83 provided in the box body 78 with a gap 81b formed therebetween. A gas passage 82 is formed between the side wall of the food tray 71 and the box 78 to connect the gaps 81a and 81b. For this reason, the high-temperature steam diffused to the outside from the watertight container of the heating tool 17 as described above flows into the space between the food tray 71 and the lid 79 through the gas passage 82.

  By forming such a gas passage 82, the food stored in the food tray 71 is heated from the bottom plate side of the food tray 71, the side wall side of the food tray 71, and further from the upper side. Therefore, by using the food heating container 70, the food stored in the food tray 71 can be heated extremely uniformly.

  For the food heating container of the present invention, for example, a known heating tool as described in Patent Document 1 or Patent Document 2 can be used. However, known heating tools such as those described in the above-mentioned documents constitute the tearable film on the upper surface of the watertight container and the upper and lower surfaces of the water bag in use by the long opening device. It is necessary to tear two films at the same time. That is, the user needs to pull the long opening device with a sufficiently large force and tear the three films in total.

  However, since the user is often not familiar with the structure of such a heating tool, it is misunderstood that if a large force is applied, the elongate opening tool will be cut or the heating tool will be broken. There is a case where the scale-like opening tool is pulled with a small force or is stopped halfway. For this reason, when the known heating tool as described above is used, the food cannot be heated because the water bag is not opened by the user, or the easily tearable film in the watertight container is not suitable. When the food is not heated evenly because the high-temperature water vapor that has been opened with a sufficient size and diffused to the outside through this opening concentrates and contacts only a part of the lower surface of the food tray. It is said that the operation is incorrect.

  Hereinafter, the heating tool used in the food heating container of the present invention will be described by taking the heating tool 17 capable of preventing the erroneous operation shown in FIG. 4 as an example.

  The heating tool 17 includes a water-tight container 15 in which a heat generating agent 12 that generates heat by contact with water and an easily tearable water bag 13 are housed, and an upper surface is covered with an easily tearable film 14, and a watertight container 15. The tearable film 14 and the elongate opening tool 16 for tearing and opening the water bag 13 are provided.

  As the exothermic agent 12, a known exothermic agent that generates heat upon contact with water, for example, quicklime powder, or a mixture of quicklime powder and aluminum powder can be used.

  An exothermic agent composed of a mixture of quicklime powder and aluminum powder is described in detail, for example, in JP-A-2001-226668. In order to obtain a larger calorific value, it is also preferable to add sodium chloride or the like to the heat generating agent (or water sealed in a water bag). About the exothermic agent which added sodium chloride etc., it describes in detail in Unexamined-Japanese-Patent No. 2006-152090, for example.

  It is preferable that the heat generating agent 12 is accommodated in a water-permeable bag 25 formed of, for example, a nonwoven fabric or Japanese paper. When the heat generating agent 12 is accommodated in the water-permeable bag body 25, handling and positioning of the heat generating agent 12 are facilitated. The “water permeability” of the bag body 25 means that the heat generating agent 12 does not permeate a large amount to the outside of the bag body 25 and has a water permeability that allows water to permeate inside. ing.

  The easily tearable water bag 13 needs to have tearability (easy tearability) to the extent that the user can easily tear it by manually pulling the long opening device 16. As shown in FIG. 4, the bag body 13 a of the water bag 13 may be provided with a cut 26 that assists in tearing by the opening tool 16.

  The bag 13a is, for example, a resin film such as a polyethylene resin film, a polypropylene resin film, a polystyrene resin film, a polyamide resin film, a polyester resin film, a polycarbonate resin film, or a polyvinyl chloride resin film, or a resin film of these resin films. It is formed from a laminated resin film in which two or more are laminated. The resin film is preferably uniaxially stretched to facilitate tearing of the water bag.

  Also, if the moisture permeability of the bag 13a is high, the water contained in the bag 13a permeates to the outside as water vapor from the time the heater 17 is manufactured until it is used, and this water vapor is stored in the watertight container. 15 is in contact with the heat generating agent 12 accommodated in 15, there is a case where a sufficient calorific value cannot be obtained when the heating tool 17 is used (when food is heated). For this reason, it is preferable to form the bag 13a from the resin film (or laminated resin film) which shows a low water vapor transmission rate. The moisture permeability of the resin film can be easily adjusted by selecting the thickness of the film and the material.

  In order to effectively suppress moisture permeability of the bag body 13a, the bag body 13a is preferably formed from a resin film in which a metal layer such as an aluminum layer is laminated (hereinafter referred to as a resin film with a metal layer). If the bag 13a is formed from a resin film with a metal layer, the metal layer hardly transmits water vapor, and thus the thickness of the resin film can be reduced. For this reason, the bag 13a can be formed from a thin film that exhibits low moisture permeability and can be easily torn.

For this reason, the film (and the easily tearable film 14) that forms the bag 13a of the water bag 13 of the heater 17 shown in FIG. 4 has a thickness on the vapor deposition surface of the aluminum vapor deposition polyester film having a thickness of 12 μm. Is a commercially available resin film with a metal layer (moisture permeability: 0.2 g / (m ² · 24 hours)) having a structure in which a polypropylene film having a thickness of 60 μm is laminated.

  A support plate 24 is provided on the water bag 13. The water bag 13 and the support plate 24 are fixed to each other at a position near the rear end (right end in FIG. 4) of the support plate 24 by a staple needle 27 of the stapler. The support plate 24 is pulled by the user in the direction indicated by the arrow written in FIG. 4 (that is, the front side) of the long opening device 16, thereby folding back the back side of the water bag 13 of the opening device 16. The water bag 13 has a function of supporting the water bag 13 when the water bag 13 is torn while the front part moves forward. There is no restriction | limiting in particular in the fixing method of the water bag 13 and the support plate 24, For example, you may fix both mutually using an adhesive tape (or adhesive agent).

  The support plate 24 preferably has an opening 24a at the center. As a result, the water flowing out of the water bag 13 can easily come into contact with the heat generating agent 12.

  The support plate 24 is made of, for example, a resin material typified by polyethylene resin or polypropylene resin, or a paper material typified by cardboard or cardboard.

  The exothermic agent 12, the water bag 13, and the support plate 24 are accommodated in a watertight container 15 whose upper surface is covered with the easily tearable film 14. As the watertight container 15, a resin container whose upper surface is covered with the easily tearable film 14 is used.

  As in the case of the bag 13a of the water bag 13, the easily tearable film 14 is tearable (easy tearable) to the extent that the user can easily tear it by pulling the elongated opening device 16 by hand. ) Is necessary. As the easily tearable film 14, those exemplified as the film forming the bag body 13a of the water bag 13 can be used.

  The structure of the watertight container is not particularly limited as long as the upper surface is formed of an easily tearable film. As the watertight container, for example, a bag body whose upper surface is formed from an easily tearable film can be used. As described above, when a resin container is used as the watertight container, it is necessary to prepare an expensive mold in order to mold the container. When a bag is used as a watertight container, there is no need to use a mold for its production, and therefore the size of the watertight container (ie, the size of the heating tool) is flexibly changed according to the size and shape of various food heating containers. It becomes possible. In addition, the above-mentioned resin container allows water vapor to pass through a little. As a watertight container, for example, by using a bag formed from a film having a very low moisture permeability typified by the above resin film with a metal layer, water vapor hardly enters the inside of the watertight container. It becomes possible to provide a heating tool having excellent properties.

  As the long opening device 16 for tearing and opening the easily tearable film 14 and the water bag 13 of the watertight container 15, a long string or a long tape is used. The long tape can be formed from, for example, a resin film or synthetic paper.

  And in the food heating container of the present invention, in order to prevent the erroneous operation of the heating tool as described above, the long opening device is opened from the side of the front end portion drawn to the outside of the box, and the side wall of the box. Extending from the rear side of the upper surface of the watertight container to the inside of the watertight container and folded back to the front side, and the front side From the top of the water bag, it is folded back on the back side of the water bag and passed under the water bag, or from the front side under the water bag and folded back on the back side of the water bag. After passing over, it is preferable to use a heating tool that is fixed to the front side of a support plate provided with the opening tool sandwiched between the upper surface or the lower surface of the water bag.

  The long opening device 16 of the heating device 17 shown in FIG. 4 passes through the side wall of the box body 18 from the side of the distal end portion 16a drawn to the outside of the box body 18 and is opposite to the side wall side. The watertight container 15 is extended to the rear end side, then inserted into the watertight container 15 from the rear side of the upper surface of the watertight container 15, folded back to the front side, and passed under the water bag 13 from the front side. After being folded on the rear side of the water bag 13 and passing over the water bag 13, the water bag 13 is fixed to the front side of the support plate 24 provided with the opening 16 sandwiched between the upper surface of the water bag 13. ing.

  When the distal end portion 16a of the long opening device 16 of the heating device 17 having such a configuration is pulled forward (in the direction indicated by the arrow written in FIG. 4), the opening device 16 first causes the upper surface of the watertight container 15 to be The easily tearable film 14 is torn and opened. As described above, the watertight container 15 can be easily opened by simply tearing the one easy tear film 14 on the upper surface without applying a large force to the long opening device 16.

  After the watertight container 15 is opened, when the elongated opening device 16 is further pulled, the portion folded back on the rear side (right side in FIG. 4) of the water bag 13 of the opening device 16 is the front side. The water bag 13 is torn while moving to water, and water flows from the water bag 13 into the watertight container 15. In this way, the water bag 13 can be opened simply by tearing the two films constituting the upper and lower surfaces without applying a large force to the elongated opening device 16.

  The water that has flowed into the watertight container 15 passes through the water-permeable bag 25 and contacts the heat generating agent 12, and the heat generating agent 12 generates heat. The high-temperature steam generated by this heat generation diffuses to the outside from the opening of the easy tear film 14 of the watertight container 15. This high-temperature steam flows into the space between the food tray 11 and the lid 19 through the gas passage 22 shown in FIG. 3, and the food contained in the food tray 11 is heated uniformly.

  As described above, when the heating tool 17 is used, the long opening device 16 first tears one film (the easily tearable film 14 on the upper surface of the watertight container 15), and then the two films ( The film constituting the upper and lower surfaces of the bag 13a of the water bag 13) is torn. That is, in the heating tool 17, since three or more films are not simultaneously torn during use, it is not necessary to apply a large force to the elongated opening tool 16. For this reason, the food heating container 10 using such a heating tool does not cause the user to misunderstand that the elongated opening tool 16 is cut or the heating tool 17 is broken. Since it can be pulled sufficiently, the food can be heated reliably and uniformly.

  In addition, although depending on the thickness of the box 18, usually, when the paper box 18 is used for the food heating container 10 as described above, the user needs to compare with the case of using the resin box. The amount of deformation of the box when the elongate opening tool 16 is pulled increases. When such deformation occurs, the force applied by the user to the long opening device 16 is used for deformation of the box 18, so that it becomes difficult to open the watertight container 15 and the water bag 13 by the opening device 16. The heating tool 17 does not need to apply a large force to the elongated opening tool 16 during use, and therefore can suppress the deformation of the box 18 as described above, so that a paper box is used. It can be particularly preferably used in the food heating container of the present invention.

  The knot 16b formed at the proximal end of the long opening device 16 is temporarily fixed to the support plate 24 in a state of being sandwiched by the notches 24b. For this reason, after the opening of the water bag 13 as described above, when the elongated opening 16 is further pulled, the knot 16b of the opening 16 is disengaged from the notch 24b of the support plate 24, and the opening 16 The whole can be pulled out of the box 18. As described above, when the long opening device 16 can be pulled out, it is not necessary to pull the opening device 16 while adjusting the magnitude of the force. For this reason, by explaining in advance to the user that the food heating container 10 is used by pulling out the long opening device 16, the opening device 16 may be cut off by the force applied when pulling the opening device 16. Alternatively, the user can pull the opening device 16 with a sufficiently large force without causing misunderstanding that the heating device 17 is broken. For this reason, the erroneous operation of the heating tool can be more reliably prevented. Further, the long opening device 16 does not hang down from the box 18 during the meal and does not get in the way.

  FIG. 9 is a diagram schematically showing another configuration example of the heating tool used in the food heating container of the present invention. However, in FIG. 9 (and FIGS. 10 to 14 described later), in order to facilitate understanding of the arrangement of the elongated opening device 16, the heat generating agent bag 28, the water bag 13, and the support plate 24 are mutually connected. Completed in a separated state.

  The configuration of the heating tool 97 in FIG. 9 is the same as that of the heating tool 17 shown in FIG. 4 except that a heating agent bag 28 containing the heating agent 12 in a water-permeable bag body 25 is disposed below the water bag 13. It is the same.

  The elongate opening device 16 of the heating device 97 penetrates the side wall of the box body from the side of the distal end portion 16a drawn to the outside of the box body of the food heating container as described above and is the side of the side wall. The watertight container 15 on the opposite side extends to the rear end (right end in FIG. 9) side, and then inserted into the watertight container 15 from the rear side of the upper surface of the watertight container 15 and folded back to the front side. From the bottom of the water bag 13, folded back on the back side of the water bag 13, passed over the water bag 13, and then the support plate 24 provided with the opening 16 sandwiched between the upper surface of the water bag 13. It is fixed to the front side.

  In the heating tool 97 of FIG. 9 as well, by pulling the tip 16a of the elongated opening tool 16, the easy tear film 14 is first torn, the watertight container 15 is opened, and then the water bag 13 is torn. Opened. Therefore, by using the heating tool 97 in the food heating container of the present invention, the user can pull the opening tool 16 sufficiently without causing the user to misunderstand that the opening tool 16 is cut or the heating tool 97 is broken. Therefore, the food can be reliably and uniformly heated.

  FIG. 10 is a diagram schematically showing still another configuration example of the heating tool used in the food heating container of the present invention.

  The structure of the heating tool 107 in FIG. 10 is such that the long opening device 16 penetrates the side wall of the box body from the side of the tip 16a drawn to the outside of the box body of the food heating container as described above. It extends to the rear end side of the watertight container 15 opposite to the side of the side wall, and is then inserted into the watertight container 15 from the rear side of the upper surface of the watertight container 15 and folded back to the front side. After passing over the water bag 13 on the rear side of the water bag 13 and passing under the water bag 13, the front of the support plate 24 provided with the opening 16 sandwiched between the upper surface of the water bag Except being fixed to the side, it is the same as that of the heating tool 17 shown in FIG.

  In the heating tool 107 of FIG. 10 as well, by pulling the distal end portion 16a of the elongated opening tool 16, the easy tear film 14 is first torn, the watertight container 15 is opened, and then the water bag 13 is torn. Opened. Therefore, by using the heating tool 107 for the food heating container of the present invention, the user can sufficiently pull the opening tool 16, so that the food can be reliably and uniformly heated.

  FIG. 11 is a diagram schematically showing still another configuration example of the heating tool used in the food heating container of the present invention.

  The configuration of the heating tool 117 in FIG. 11 is the same as that of the heating tool 107 in FIG. 10 except that the heat generating agent bag 28 is disposed below the water bag 13.

  In the heating tool 117 of FIG. 11 as well, by pulling the tip 16a of the elongated opening tool 16, the easy tear film 14 is first torn, the watertight container 15 is opened, and then the water bag 13 is torn. Opened. Therefore, by using the heating tool 117 for the food heating container of the present invention, the user can sufficiently pull the opening tool 16, so that the food can be reliably and uniformly heated.

  FIG. 12 is a diagram schematically showing still another configuration example of the heating tool used in the food heating container of the present invention.

  The heating tool 127 shown in FIG. 12 is configured so that the long opening tool 16 penetrates the side wall of the box body from the side of the distal end portion 16a drawn to the outside of the box body of the food heating container as described above. It extends to the rear end side of the watertight container 15 opposite to the side of the side wall, and is then inserted into the watertight container 15 from the rear side of the upper surface of the watertight container 15 and folded back to the front side. The support plate 24 provided under the condition that the unsealing tool 16 is sandwiched between the lower surface of the water bag 13 after passing under the water bag 13 and being folded back on the water bag 13 and passing over the water bag 13. Except being fixed to the front side, it is the same as the heating tool 17 shown in FIG.

  In the heating tool 127 of FIG. 12, the easy tear film 14 is first torn and the watertight container 15 is unsealed, and then the water bag 13 is torn by pulling the tip 16 a of the elongated opening tool 16. Opened. Therefore, by using the heating tool 127 for the food heating container of the present invention, the user can sufficiently pull the opening tool 16, so that the food can be reliably and uniformly heated.

  FIG. 13 is a diagram schematically showing still another configuration example of the heating tool used in the food heating container of the present invention.

  The configuration of the heating tool 137 in FIG. 13 is the same as that of the heating tool 127 in FIG. 12 except that the heat generating agent bag 28 is disposed below the support plate 24.

  In the heating tool 137 of FIG. 13 as well, by pulling the distal end portion 16a of the elongated opening tool 16, the easy tear film 14 is first torn, the watertight container 15 is opened, and then the water bag 13 is torn. Opened. Therefore, by using the heating tool 137 for the food heating container of the present invention, the user can sufficiently pull the opening tool 16, so that the food can be reliably and uniformly heated.

  FIG. 14 is a diagram schematically showing still another configuration example of the heating tool used in the food heating container of the present invention.

  The heating tool 147 shown in FIG. 14 is configured so that the long opening device 16 penetrates the side wall of the box body from the side of the tip 16a drawn to the outside of the box body of the food heating container as described above. It extends to the rear end side of the watertight container 15 opposite to the side of the side wall, and is then inserted into the watertight container 15 from the rear side of the upper surface of the watertight container 15 and folded back to the front side. After passing over the water bag 13, folded back on the back side of the water bag 13 and passed under the water bag 13, the support plate 24 provided with the opening 16 sandwiched between the lower surface of the water bag 13. Except being fixed to the front side, it is the same as the heating tool 17 shown in FIG.

  In the heating tool 147 shown in FIG. 14 as well, by pulling the distal end portion 16a of the elongated opening tool 16, the easily tearable film 14 is first torn, the watertight container 15 is opened, and then the water bag 13 is torn. Opened. Therefore, by using the heating tool 147 for the food heating container of the present invention, the user can sufficiently pull the opening tool 16, so that the food can be reliably and uniformly heated.

  FIG. 15 is a diagram showing another configuration example of a box and a lid that can be preferably used in the food heating container of the present invention. FIG. 16 is a development view of the box 158 shown in FIG. FIG. 17 is a development view of the lid 159 shown in FIG.

  The box 158 shown in FIG. 15 can be assembled very easily by folding one cardboard sheet (or paper material such as cardboard) shown in the development view of FIG.

  The corrugated cardboard sheet shown in FIG. 16 has a total of four rectangular side wall portions 162a, 162b, 162c, and 162d that are connected to the rectangular bottom surface portion 161 and the four sides of the bottom surface portion through crease lines, and a pair that faces each other. Folding parts 163a and 163b connected to the side opposite to the bottom face 161 side of each of the side wall parts 162a and 162b via a crease line, on the side opposite to the side wall part 162a of one folding part 163a Two claw portions 164a, 164b protruding from the side, two claw portions 164c, 164d protruding from the side opposite to the side wall portion 162b of the other folding portion 163b, the remaining pair of side wall portions 162c, Each side of each of the folding portions 165a and 165c and the other side wall portion 162d connected to each side of the side wall portion 162c of the 162d via a crease line. Are engaged with the claw portions 164a, 164b, 164c, 164d respectively protruding from the bottom sides of the folding portions 165b, 165d and the folding portions 165a, 165b, 165c, 165d. The claw stoppers 167a, 167b, 167c, 167d have holes 166a, 166b, 166c, 166d.

  First, each of the side wall portions 162c and 162d is raised by bending the corrugated cardboard sheet shown in FIG. 16 along a crease line between the bottom surface portion 161 and each of the side wall portions 162c and 162d. At this time, the side wall part 162c and the folding part 165a are folded at an angle of about 90 degrees along the crease line between the two, thereby raising the folding part 165a to the inner side of the side wall part 162c, and the claw stopper part 167a. Is folded at the bottom side of the folding part 165a, so that the claw stopper part 167a is arranged in a state protruding from the inner surface of the bottom surface part 161. Similarly, each of the folding parts 165b, 165c, 165d is raised, and each of the claw stoppers 167b, 167c, 167d is disposed in a state of protruding inside the upper surface of the bottom surface part 161.

  Next, the side wall portion 162a is raised by bending the bottom surface portion 161 and the side wall portion 162a along a crease line therebetween. At this time, by folding the side wall part 162a and the folding part 163a at the crease line between them, the folding part 163a is folded inward with the folding parts 165a, 165b sandwiched between the side wall part 162a, The claw portion 164a of the folding portion 163a is inserted into the hole 166a of the claw stop portion 167a, and the claw portion 164b is inserted into the hole 166b of the claw stop portion 167b and temporarily fixed. Thereby, the side wall part 162a is temporarily fixed in a state where the side wall part 162a is raised from the bottom surface part 161.

  Then, as shown in FIG. 15, the side wall part 162b is raised by folding the bottom surface part 161 and the side wall part 162b along the crease line between them, and at this time, the side wall part 162b and the folding part 163b are placed between the two. The claw portion 164c of the folding portion 163b is inserted into the hole 166c of the claw stop portion 167c by folding the folding portion 163b inward with the folding portions 165c and 165d being sandwiched between the side wall portion 162b. Then, the claw portion 164d is inserted into the hole 166d of the claw stop portion 167d and temporarily fixed. Thereby, the side wall part 162b is temporarily fixed in a state where the side wall part 162b is raised from the bottom surface part 161.

  As described above, the box body 158 can be easily assembled by folding a single cardboard sheet without using a stapler or an adhesive. Further, since the box body 158 includes two of the four side walls in total (a side wall constituted by each of the side wall part 162c and the side wall part 162d), it is formed of a single cardboard sheet. There is also an advantage that the amount used is small.

  The lid 159 shown in FIG. 15 can be assembled very easily by folding one cardboard sheet (or paper material such as cardboard) shown in the development view of FIG. 17 in the same manner as the case of the box 158. it can.

  The corrugated cardboard sheet shown in FIG. 17 has a total of four rectangular side wall portions 172a, 172b, 172c, and 172d that are connected to the four sides of the rectangular lid portion 171 and the lid portion 171 through crease lines, and face each other. Folding parts 173a and 173b connected to the side opposite to the lid part 171 side of each of the pair of side wall parts 172a and 172b via a crease line, the side opposite to the side wall part 172a of one folding part 173a Two claw portions 174a and 174b protruding from one side, two claw portions 174c and 174d protruding from the side opposite to the side wall portion 172b of the other folding portion 173b, and the remaining pair of side wall portions 172c , 172d, the side portions of one side wall portion 172c connected to each side of the side wall portion 172c via a crease line, and the other side wall portion 172d of each side Are engaged with the claw portions 174a, 174b, 174c, and 174d respectively protruding from the bottoms of the folding portions 175b and 175d and the folding portions 175a, 175b, 175c, and 175d. The claw stoppers 177a, 177b, 177c, and 177d have holes 176a, 176b, 176c, and 176d.

  By using such a box 158 and a lid 159, the assembly of the food heating container becomes extremely easy.

It is a perspective view which shows the structural example of the food heating container of this invention. It is a disassembled perspective view of the food heating container 10 of FIG. It is an expanded sectional view of the food heating container 10 cut | disconnected along the cutting line III-III line entered in FIG. It is an expanded sectional view of the food heating container 10 cut | disconnected along the cutting line IV-IV line entered in FIG. It is sectional drawing which shows another structural example of the food heating container of this invention. It is a disassembled perspective view of the food tray 51 and the support tool 63 which are shown in FIG. It is a disassembled perspective view which shows another structural example of the food heating container of this invention. It is sectional drawing of the food heating container 70 cut | disconnected along the cutting line VIII-VIII line entered in FIG. However, the food heating container 70 is filled in with the lid 79 of the box 78 closed. It is a figure which shows typically another structural example of the heating tool used for the food heating container of this invention. It is a figure which shows typically another structural example of the heating tool used for the food heating container of this invention. It is a figure which shows typically another structural example of the heating tool used for the food heating container of this invention. It is a figure which shows typically another structural example of the heating tool used for the food heating container of this invention. It is a figure which shows typically another structural example of the heating tool used for the food heating container of this invention. It is a figure which shows typically another structural example of the heating tool used for the food heating container of this invention. It is a figure which shows another structural example of the box which can be preferably used for the food heating container of this invention, and a cover body. It is an expanded view of the box 158 shown in FIG. FIG. 16 is a development view of the lid body 159 shown in FIG. 15.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Food heating container 11 Food tray 12 Heat generating agent 13 Easy tearable water bag 13a Bag body 14 Easy tearable film 15 Watertight container 16 Long opening tool 16a Opening tool 16 tip 16b Opening tool 16 knot 17 Heating tool 18 Box 18a Outer box 18b Inner box 19 Lid 21a, 21b, 21c Gap 22 Gas passage 23 Support 23a, 23b Side wall part 23c Connection part 23d Notch part 23e Protrusion part 24 Support plate 24a Open part 24b Cut 25 Permeability 26 Incision 27 Binding needle 28 Heating agent bag 29 Incision 50 Food heating container 51 Food tray 61a, 61b, 61c Gap 62 Gas passage 63 Supporting tool 70 Food heating container 71 Food tray 78 Box body 79 Cover body 81a, 81b, 81c Gap 82 Gas passage 83 Support tool 84 Side wall 84a Mouth part 85 Leg part 97, 107, 117, 127, 137, 147 Heating tool 158 Box body 159 Cover body 161 Bottom face part 162a, 162b, 162c, 162d Side wall part 163a, 163b Folding part 164a, 164b, 164c, 164d Claw part 165a, 165b, 165c, 165d Folding part 166a, 166b, 166c, 166d hole 167a, 167b, 167c, 167d Claw stopper 171 Lid part 172a, 172b, 172c, 172d Side wall part 173a, 173b, 174b, 174b 174d Claw portion 175a, 175b, 175c, 175d Folding portion 176a, 176b, 176c, 176d Hole 177a, 177b, 177c, 177d Claw stopper

Claims (7)

Food tray; a watertight container that is disposed under the food tray and contains a heat-generating agent that generates heat by contact with water and an easily tearable water bag, and has an upper surface covered with an easily tearable film And a heating device comprising an easily tearable film of a watertight container and a long opening device for tearing and opening a water bag; a box body containing a food tray and a heating device and having an opening at the upper end; and a box A food heating container that includes a lid that closes the opening of the body, and the leading end of the elongate opener penetrates the side wall of the box and is drawn out of the box,
The food tray is formed by a box with a gap formed between the bottom surface of the food tray and the peripheral edge of the upper surface of the heating tool, and between the top of the side wall of the food tray and the lower surface of the lid. A food heating container characterized in that a gas passage connecting the gap between the two is formed between the side wall of the food tray and the box.   The food heating container according to claim 1, wherein the box includes a support that supports the food tray in a state where a gap for forming the gas passage is formed.   The food heating container according to claim 1 or 2, wherein the box is made of paper.   The box is supported by a cylindrical outer box whose bottom opening area is set smaller than the upper opening area, and is fitted and supported inside the outer box in a raised state. The food heating container according to claim 3, comprising an inner box comprising:   The food heating container according to claim 4, wherein the outer box is composed of a corrugated cardboard sheet having a striped uneven surface exposed to the outside.   The food heating container according to claim 5, wherein the length direction of the stripes on the uneven surface is arranged in a direction inclined with respect to the bottom side of the outer box.   A long opening device extends from the side of the front end portion pulled out to the outside of the box to the side of the watertight container opposite to the side of the side wall through the side wall of the box, Next, it is inserted into the inside of the watertight container from the rear side of the upper surface of the watertight container, folded back to the front side, and then passed over the water bag from the front side and folded back on the rear side of the waterbag and passed under the water bag. Or after passing under the water bag from the front side and folded back on the back side of the water bag and passing over the water bag, the opening device is provided with the opening tool sandwiched between the upper surface and the lower surface of the water bag. The food heating container according to claim 1, wherein the food heating container is fixed to the front side of the support plate.

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