JP2006346329A - Heating device and container for portable food incorporating heating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To stabilize the generating state of steam by making a structure in which an exothermic agent is never moved while heating reaction of water and an exothermic agent is advanced after a water bag is unzipped in a heating device where a chemical exothermic agent is housed with a water pack in a heating tray and where the water pack and a protection sheet are unzipped simultaneously. <P>SOLUTION: An exothermic agent pack fixing plate 3 having an opening part 9 is manufactured with a paper board manufactured by milling fibrous material. The lower half 8 of the exothermic agent pack 4 obtained by packing the exothermic agent consisting of aluminum powder and unslaked lime powder in an unwoven fabric bag is fitted into the opening part 9. The water pack 5 obtained by packing water into a polyethylene film is superimposed with the exothermic agent pack 4. A tear tape 7 fixed to the end 10 of the exothermic agent pack fixing plate 3 is put through between the water pack 5 and the exothermic agent pack 4. A protrusion 12 for unzipping the water pack formed at the lower end of the water pack 5 is adhered with the other end 13 of the fixing plate 3 through the tear tape 7, and the residual part of the tear tape 7 is made to project from the upper end edge of the heating tray 2. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a heating device and a portable food container incorporating the heating device, and in particular, a portable food heating device and a heating device capable of heating and keeping a cooked food such as a station valve at any time regardless of place and time. The present invention relates to a portable food container.

  In recent years, there has been an increasing demand for simple portable foods that can enclose liquid foods or cooked foods such as emergency foods or sake in a container with a heating function, and can be heated and kept at any time regardless of location and time. .

Portable food containers come in a variety of shapes and capacities, but small ones are sake bottles and large ones are ekiben. The former is about 200 cm ³ and the latter is about 2000 cm ³ . Although it depends on the contents of the warmed food, for example, in the case of an ekiben, in order to appropriately heat both rice and side dishes, it must be heated to around 90 ° C, preferably 90 ° C to 100 ° C. Furthermore, since the heat capacity of the material of the cooking container itself is small, it is not possible to expect a heat retaining effect in the cooking container. Therefore, it is necessary that the exothermic agent itself used in the heating device has a function of causing the exothermic reaction to reach the maximum temperature and at least the time until it falls to room temperature, that is, the temperature holding time is maximized. is there.

  Various proposals using the exothermic reaction of chemical substances have been made. As a typical example, a type of exothermic agent utilizing a hydration reaction between calcium oxide (quick lime) and water has been conventionally used.

  Patent document 1 is disclosing the heating container using the heat generating agent using the hydration reaction of calcium oxide and water. This heating container is a non-water-permeable bag made of synthetic resin film such as polyethylene and a heat-generating bag filled with quicklime in a non-water-permeable bag made of synthetic resin film such as polyethylene on a board made of cardboard. Water bags filled with water are stacked in this order, and the breaking string that breaks both the heat-generating bag and the water bag is locked to one end of the mount, and the breaking string is connected to the heat-generating bag. It is fixed to both ends of the water bag, accommodated in the heating container, the breaking string is penetrated from the drawing hole provided on the side surface of the heating container, and the heating bag and the water bag are broken by pulling the breaking string from the outside. It has become.

  Since the calorific value due to the reaction between calcium oxide and water is as small as 15.2 kcal, after the reaction, in order to quickly raise the temperature to 90 ° C. or more and 100 ° C. or less and maintain it for at least 20 minutes before dropping to 60 ° C., Requires a large amount of calcium oxide. In order to heat a standard portable food with the heating container described in Patent Document 1, 83 g of calcium oxide and 70 mL of water are required.

  By the way, the polyethylene film for packaging the heat generating agent is the cheapest among (a) plastic films. (B) Heat sealing is possible easily and complete sealing is possible. (C) Good water resistance and moisture resistance. (D) It has advantages such as lightness and high tear strength.

  The characteristic that polyethylene film has high tear strength, that is, is difficult to tear, is a drawback in the case of a breakable string pull-out type heating container. The reason is that calcium oxide has extremely high hygroscopicity. If left as it is, it absorbs moisture and carbon dioxide in the air and changes to calcium hydroxide and calcium carbonate. It won't happen.

  In particular, when the exothermic agent used in the heating container described in Patent Document 1 is composed of a large amount of 83 g of calcium oxide, when the moisture absorbs moisture and carbon dioxide in the air, the reaction is chained. Will be lost and the whole will be deactivated. Therefore, the thickness of the polyethylene film must be increased as much as possible to completely prevent moisture in the air and absorption of carbon dioxide.

  When the thickness of the polyethylene film is 50 μm, the tear strength is 200 to 800 g / 50 μ for the low density polyethylene film, 100 to 600 g / 50 μ for the medium density polyethylene film, and 100 to 600 g / 50 μ for the medium density polyethylene film. Is 30 to 600 g / 50 μm. In the case of a breakable string pull-out type heating container, this tear strength is difficult for children to tear, and the breakable string pullout may be broken halfway.

  Furthermore, since the heating container described in Patent Document 1 has a structure in which both the water bag and the heat generating bag must be broken at the same time, no heat is generated when one of the bags is not broken. Therefore, there is a drawback that the risk of generating a defective product is twice that of a heating container structured so that only the water bag needs to be broken.

  Patent Document 2 is an improved invention of the invention described in Patent Document 1. In the invention described in Patent Document 1, since a large amount of quick lime (calcium oxide) of about 80 g was packaged in a bag made of polyethylene film having a high tear strength, there was a drawback that it could not be easily torn. The invention described in Patent Document 2 has a structure in which quicklime is exposed without packaging and is put into the bottom of the case in a discrete manner and polymerized with a string support material for breaking, a water bag, and a moisture-proof sheet thereon.

  First, the water bag will be described. Since the quick-lime lime, which is highly hygroscopic, has been exposed to the bottom of the case without being wrapped, it is normally used as a water bag material to prevent quick-lime from absorbing moisture in the air. ) / PE (polyethylene) is sufficient, but is manufactured by a laminate in which a moisture-proof layer made of aluminum or the like that does not transmit water vapor (moisture) is sandwiched between a plurality of resin layers. Further, in order to completely prevent moisture absorption of quicklime, a laminate in which a moisture-proof layer made of aluminum or the like is sandwiched between a plurality of resin layers is used as a moisture-proof sheet. That is, it has a complicated and costly structure in which the exposed quick lime is double protected with an aluminum laminate film so as not to absorb moisture in the air.

  Furthermore, in the invention described in Patent Document 2, since the quick lime is exposed without being wrapped and put into the bottom of the case, and the breaking string support material is polymerized thereon, the breaking string support material is It is in a state where the quick lime placed in the lower part is completely covered. Accordingly, there is a case in which a time difference occurs in which a part of quicklime reacts with water, or even if it reacts, the breaking string support material becomes an obstacle and the water vapor does not rise.

  One of the applicants has 15 to 30% of powdered quicklime of 100 mesh (−150 μm 90% or more) to 200 mesh (−75 μm 95% or more) and 40 to −330 mesh (−45 μm) per mass of the heat generating agent. 60%, +330 mesh (+45 μm) 15-30%, +235 mesh (+63 μm) 15%>, +200 mesh (+75 μm) 10%> 70% to 85% powder aluminum, When reacted, a heat generating agent that generates steam of about 90 ° C. to about 100 ° C. in a short time and has a duration of at least 20 minutes until dropping to 60 ° C. has been invented, and has already been patented (patent) No. 3467729). Since the configuration, performance, and the like of the heat generating agent are described in the patent publication, a detailed description thereof is omitted.

One of the applicants further developed the exothermic agent related to Japanese Patent No. 3467729, added sodium chloride (NaCl) to increase the amount of generated heat, and further added magnesium chloride (MgCl ₂ ) to extend the exothermic time. And succeeded in reducing the amount of hydrogen generated, and applied for patents.

  Therefore, according to claim 3 of the present invention, “the exothermic agent is 15 to 30% of powdered quicklime of 100 mesh (−150 μm 90% or more) to 200 mesh (−75 μm 95% or more) per mass of the exothermic agent, and -330 mesh (-45 μm) 40 to 60%, +330 mesh (+45 μm) 15 to 30%, +235 mesh (+63 μm) 15%>, +200 mesh (+75 μm) 10%> The phrase “comprising a composition comprising 70 to 85% aluminum” includes a heat generating agent according to Japanese Patent No. 3467729, a heat generating agent added with NaCl, and a heat generating agent further added with MgCl 2.

  Furthermore, one of the present applicants developed a heating unit using a heat generating agent according to Japanese Patent No. 3467729 and applied for a patent (Japanese Patent Application Laid-Open No. 2004-16395) ([Patent Document 3]).

  In Patent Document 3, a heat-generating agent pack in which a heat-generating agent according to Japanese Patent No. 3467729 is packaged is stored together with a water pack in a heat-generating tray that opens on the upper surface, and the upper opening edge of the heat-generating tray is covered with a protective sheet. Discloses a heat-sealed heating unit together with a tear tape that simultaneously cleaves a water pack and a protective sheet.

  The major difference between the exothermic packaging material used in the heating container described in Patent Document 1 and the exothermic packaging material used in the heating unit of Patent Document 3 is that the former is completely impermeable to moisture. The latter is a water-permeable nonwoven fabric bag.

  The reason for this is that, in the heating unit of Patent Document 3, since the heat generating tray containing the heat-generating agent pack and the water pack which are accommodated is sealed with a protective sheet, the heat generating tray itself is impermeable to moisture. It is. Further, 60% or more of the total calorific value of the heat generating agent used in the heating unit of Patent Document 3 is contributed by powdered aluminum, powdered aluminum is a heat generating agent, and powdered calcium oxide is a heat generating aid. . Therefore, unlike the exothermic agent used in the heating container described in Patent Document 1 in which the total amount of exothermic agent is a single product of calcium oxide, even if part of the powdered calcium oxide absorbs moisture, the absorbed water and powder This is because aluminum reacts and generates a sufficient amount of heat.

However, in the heating unit described in Patent Document 3, the heat generating agent pack is placed on the bottom of the heat generating tray, and the water pack is simply polymerized thereon, so that the heat generating agent pack is free at the bottom of the heat generating tray. It has a structure that can be moved to. Therefore, it was found that when the station valve incorporating the heating unit is tilted, the exothermic pack moves while the exothermic reaction with water is in progress, and the generation state of steam becomes unstable.
JP-A-11-2922155 JP 2002-360439 A JP 2004-16395 A

  The problem to be solved by the invention is that a heat-generating agent pack in which a water-permeable nonwoven fabric bag is filled with a chemical heat-generating agent containing powder calcium oxide and powder aluminum in a specific ratio, and a water pack in a heat-generating tray that opens on the upper surface. In a heating device that is housed together and heat-sealed together with tear tape that tears the water pack and protective sheet at the same time with the protective sheet at the top opening edge of the heat generating tray, water and heat are generated after the water bag is cleaved. The structure is such that the exothermic pack does not move while the exothermic reaction with the agent is in progress, and the generation state of the vapor is stabilized.

  As a means to fix the exothermic pack placed on the bottom of the plastic heat generating tray so that it does not move, fixing with a fastener such as staples is impossible because it will make a hole in the bottom of the heat generating tray and leak water In addition, bonding with an adhesive, double-sided tape, etc. is impossible because of the presence of water.

  Therefore, the lower half of the heat generating pack should be fitted and fixed to the heat generating agent pack fixing plate provided with an opening for fitting the lower half of the heat generating agent pack having a substantially elliptical cross section on a plate made of an arbitrary material. investigated.

  Furthermore, as a result of the examination, any material such as plastic, wood, cardboard, etc. can be selected as the material for the heat generating agent pack fixing plate, but the cost is low, the weight is light, and the workability is good. Taking into account, it was found that cardboard is preferable.

  Furthermore, when cardboard is used as the material for the heat generating agent pack fixing plate, the paper itself absorbs water, the mass increases, and the effect of fixing the heat generating agent pack is enhanced.

  The cardboard suitable for use in the present invention is also preferably a paper board manufactured by forging a fibrous material and having a thickness of 0.3 mm or more. Alternatively, it may be a board made by mixing several layers of pulp.

Therefore, the above problems are solved by the means described in the following items.
1. A heat generating pack in which a water-permeable bag is filled with a chemical heat generating agent and a water pack polymerized on the heat generating agent pack are housed in a heat generating tray that opens on the upper surface, and the upper surface opening of the heat generating tray is impermeable to moisture. A heating device of a type that is sealed with a protective sheet and tears the protective sheet and the water pack almost simultaneously by pulling out the tear tape from the outside of the container,
(1) The heating agent pack fixing plate provided with an opening is disposed in contact with the bottom wall of the heating tray, and the lower half of the heating agent pack is fitted into the opening to fix the heating agent pack.
(2) One end of the tear tape is fixed to one end of the heating agent pack fixing plate,
(3) The water pack tearing protrusion is formed on the lower end of the water pack facing the one end of the heat generating agent pack fixing plate,
(4) The tear tape fixed to one end of the heat generating agent pack fixing plate passes between the heat generating agent pack and the water pack and is bonded to the water pack tearing protrusion, and the upper end edge of the heat generating tray Is pulled out from between the protective sheet and joined to the heat generating tray together with the protective sheet, the remainder is inverted and bent and fused to the surface of the protective sheet, and the remaining extension protrudes from the heat generating tray to the free end And (5) the heating device characterized in that the water pack tearing projection and the other end of the heat generating agent pack fixing plate are joined via a tear tape.

2. In the item 1, the material of the heat generating agent pack fixing plate is cardboard.

3. The exothermic agent is 100 mesh (-150 μm 90% or more) to 200 mesh (−75 μm 95% or more) powdered quicklime 15 to 30%, and −330 mesh (−45 μm) 40 to 60% per mass of the exothermic agent. , +330 mesh (+45 μm) 15 to 30%, +235 mesh (+63 μm) 15%>, +200 mesh (+75 μm) 10%> To do.

4). The container for portable foods incorporating the heating device according to any one of claims 1 to 3.

According to the first aspect of the invention, the following effects can be achieved.
1. A plate made of any material is provided with an opening in which the lower half of the heat generating agent pack having a substantially elliptical cross section can be inserted, and the lower half of the heat generating agent pack is inserted into the opening. Fixed and stable.

2. By pulling tear tape from the outside of the container, it is only necessary to cleave the water pack in the heating tray, so the structure is simple compared to the conventional technology that cleaves both the water pack and the heat generating agent pack. Yes, the incidence of defective products is reduced by half compared to the prior art.

3. A tear tape that contains the heat-generating agent pack together with the water pack in the heat-generating tray that opens on the top surface, and tears the water pack and the water-impermeable film at the top opening edge of the heat-generating tray with a water-permeable film Together with the heat-sealed heating device, it becomes an object of commercial transactions as an independent self-contained product itself, and the application can be expanded.

According to the invention of claim 2, the following effects can be achieved.
1. By using cardboard as the material for the heat generating agent pack fixing plate, water itself absorbs water, the mass increases, and the effect of fixing the heat generating agent pack is enhanced.

2. Since cardboard is used as the material for the heat generating agent pack fixing plate, the cost is low, the weight is light, the workability is improved, and manual processing is possible for small-scale production.

According to the third aspect of the present invention, the exothermic agent may be 100 mesh (−150 μm 90% or more) to 200 mesh (−75 μm 95% or more) powdered quicklime 15 to 30% and −330 mesh (− 45 to 60%, +330 mesh (+45 μm) to 15 to 30%, +235 mesh (+63 μm) to 15%>, +200 mesh (+75 μm) to 10%> 70% to 85% powder aluminum Since NaCl or MgCl ₂ may be added, when it reacts with water, water vapor of about 90 ° C. to about 100 ° C. is generated in a short time and falls to 60 ° C. The duration of up to can be at least 20 minutes.

According to the invention of claim 4, by storing the heating device in the portable food container in advance, the original functionality, convenience, storage, hygiene, etc. of the portable food container are improved, and the portable with heating function is provided. Applications of food containers are expanded.
The term “tear tape” used in the present invention includes so-called string such as a string of strings, a monofilament, or a string.

Hereinafter, preferred embodiments of the invention will be described with reference to the drawings.
FIG. 1 is an exploded cross-sectional view showing a configuration of an embodiment of a heating device 1 of the present invention. In FIG. 1, 2 is a heat generating tray, 3 is a heat generating agent pack fixing plate, 4 is a heat generating agent pack, 5 is a water pack, 6 is a moisture-impermeable protective sheet, and 7 is a tear tape.

  The heating device of the present invention pulls the end portion of the tear tape 7 to cleave the protective sheet 6 and the water pack 5 almost simultaneously. For that purpose, it is important to combine the protective sheet 6 with a material that can be bonded together, for example, heat-sealed and easily peeled off, at the peripheral edge of the heating tray 2.

  Hereinafter, preferable combinations of the material for the heating tray 2 and the material for the protective sheet 6 suitable for the present invention will be exemplified.

  When PP is used for the heating tray 2, the protective sheet 6 is PET / DL / VM / PET / PE / CMPS007, PET / DL / VM / PET / DL / CMPS008C, PET / DL / VM / PET / PE / DL / CMPS011C, PET / DL / VM-PET / PE / CMPS017C, ONY / DL / CMPS017C, PET / PE / CMPS006, PET / PE / CMPS006 and the like are preferable.

 When PVC is used for the heating tray 2, the protective sheet 6 is preferably PET / DL / VM-PET / PE / CMPS006, PETPE / CMPS009, PET / DL / ONY / PE / CMPS009, or the like.

  When PP / EVOH / PP is used for the heating tray 2, the protective sheet 6 is preferably ONY / DL / EVOH / DL / CMPS013C, PET / PE / AL / PE / CMPS009, or the like.

When A-PET is used for the heating tray 2, the protective sheet 6 is preferably ONY / DL / ONY / DL / ABF65C, PET / DL / ABF65C, or the like.

When PS is used for the heating tray 2, the protective sheet 6 is preferably PET / DL / VM-PET / PE / CMPS009, PET / PE / CMPS009, or the like.

  Here, PET is polyethylene terephthalate, DL is dry lamination, VM is aluminum deposition, PE is polyethylene, CMPS is carboxymethylated polystyrene, ONY is stretched nylon, EVOH is ethylene vinyl alcohol, PP is Polypropylene and ABS are acrylic-butadiene resins, AL is aluminum foil, and A-PET is amorphous polyester.

  The heat generating agent pack fixing plate 3 is formed with an opening 9 having a size for fitting the substantially lower half 8 of the heat generating agent pack 4 having a substantially elliptical cross section.

  One end portion 11 of the tear tape 7 is fixed to the end portion 10 of the heat generating agent pack fixing plate 3.

  As the material of the heat generating agent pack fixing plate 3, any material such as plastic, wood, cardboard, etc. can be selected, but cardboard is preferable in consideration of low cost, light weight, good workability, etc. . When cardboard is used as the material for the heat generating agent pack fixing plate 3, the card itself absorbs water, the mass increases, and the effect of fixing the heat generating agent pack is enhanced.

  Preferable cardboard as the material for fixing the heat generating agent pack 3 is a paper board with a thickness of 0.3 mm or more manufactured by forging a fibrous material. Alternatively, it may be a board made by mixing several layers of pulp.

  The exothermic pack 4 used in the heating device 1 of the present invention has a cross-section in which a heat-generating agent obtained by uniformly mixing powder calcium oxide and powder aluminum in a predetermined blending amount is filled in a permeable paper or cloth bag. Is an oblong flat shape.

  The exothermic pack 4 used in the heating device 1 of the present invention is a product in which a bag of water-permeable paper or cloth is filled with an exothermic agent in which powdered calcium oxide and powder aluminum are uniformly mixed in a predetermined blending amount. However, of course, before being set on the heating tray 2, it is completely sealed in a non-moisture permeable bag made of aluminum foil or aluminum vapor deposition film. Immediately before setting on the heat generating tray 2, it is taken out from the non-breathable bag made of aluminum foil or aluminum vapor deposited film and set on the heat generating tray 2, but finally sealed with a non-moisture permeable protective sheet 6. Therefore, the heat generating agent pack 4 does not absorb moisture until the protective sheet 6 is cleaved.

  The water pack 5 is configured so as to be cleaved by applying an appropriate force from the outside of the heating device 1 so that the water therein flows out quickly, so-called easy open property or easy peel property.

  Since the powder calcium oxide filled in the heat generating agent pack 4 has a property of reacting immediately after absorbing the humidity in the air, the material of the water pack 5 must be moisture-impermeable.

Hereinafter, materials suitable for the water pack 5 of the present invention will be described.
When the partial pressures of water vapor (humidity) on both sides of the film of thickness L and surface area A are P1 and P2, respectively, when the amount of humidity transmitted at time t in a steady state is Q,
Q = {P · (P1-P2) · A · t} / L (1)
Q = {P · ΔP · A · t} / L (2)
(2)
Q / {A · t} = {P · ΔP} / L = q (3)
The permeation amount q of water vapor in a unit area and unit time of a film under a specific condition is referred to as moisture permeability (WVTR), and its unit is g · m ⁻² · 24 h ⁻¹ . That is, the amount of water vapor that permeates through a film having a surface area of 1 m ² in 24 hours is expressed in grams.

  The moisture permeability of the material suitable for the water pack 5 of the present invention is 15 or less, preferably in the range of 0.3-15, more preferably in the range of 0.3-7, most preferably in the range of 0.3-3. .

  Suitable films for the water pack 5 of the present invention are polyvinylidene chloride, polyvinyl alcohol, polytetrafluoroethylene, polyethylene (high density = 0.960), polyethylene (medium density = 0.93), polypropylene (density = 0.0.3). 907), polyethylene (low density = 0.922), polyvinyl chloride, poly (vinyl chloride-vinyl acetate), poly (styrene-butadiene), polystyrene, polyethylene terephthalate, polyacrylonitrile, poly (butadiene-acrylonitrile), etc. Is done.

  Laminate films suitable for the water pack 5 of the present invention are biaxially stretched polyethylene terephthalate / low density polyethylene / uniaxially stretched polyethylene / aluminum foil / ethylene-vinyl acetate, biaxially stretched nylon / aluminum foil / polyethylene, biaxially stretched. Examples include polyethylene terephthalate / uniaxially stretched polyethylene / aluminum foil / polypropylene, polypropylene / eval / polypropylene, polypropylene / polyvinylidene chloride / polypropylene, nylon / polypropylene, polycarbonate / polypropylene, stretched nylon / polyethylene, steel foil / polypropylene, and the like.

  Further, from the viewpoint of the cleavage mechanism, one using an interfacial peeling type, one using an interlayer peeling type, one using a cohesive peeling type, etc. can be arbitrarily selected. However, the cohesive peeling type is superior from the viewpoint of the stability of the seal, the interfacial peeling type is superior from the viewpoint of the line sealability, and the interface peeling type is superior from the state of the peeling surface. Further, a V-notch or the like can be arbitrarily selected such as a notch that is opened in a certain direction.

  A water pack tearing protrusion 12 is formed integrally with the water pack 5 at the lower end of the water pack 5. The water pack tearing protrusion 12 is bonded to the tear tape 7 to facilitate the tearing of the water pack 5. The location where the water pack tearing projections 12 are formed must be on the side facing the end 10 of the heat generating agent pack fixing plate 3 to which one end 11 of the tear tape 7 is fixed.

  The preferred examples of the material of the protective sheet 6 and the material of the heating tray 2 have already been described.

  One end portion 11 of the tear tape 7 is fixed to the end portion 10 of the heat generating agent pack fixing plate 3, passes between the heat generating agent pack 4 and the water pack 5, and the lower end portion of the water pack 5. Are bonded to the water pack tearing protrusions 12 formed on the heat-generating tray 2 and pulled out from between the heat-generating tray 2 and the protective sheet 6, joined together with the protective sheet 6 to the heat-generating tray 2, inverted and bent, and then the protective sheet 6. The other tip 11 protrudes from the heating device 1 to be a free end, and forms a heating device as a whole.

  The water pack tearing protrusion 12 and the end portion 13 of the heat generating agent pack fixing plate 3 are joined to each other by a predetermined means via the tear tape 7. Therefore, in the heating device 1 of the present invention, the lower half 8 of the heat generating agent pack 4 is fitted and fixed in the opening 9 of the heat generating agent pack fixing plate 3, and the tear tape 7 is interposed on the heat generating agent pack 4. The water pack 5 is polymerized and integrated and accommodated in the heat generating tray 2.

  FIG. 2 is a cross-sectional view of a portable food container 15 incorporating the heating device 1 of the present invention. In FIG. 2, the same elements as those in FIG.

  The container body 15 accommodates the heating device 1 and the food tray 16 from below. The cross-sectional shape of the container body 15 varies depending on the type of food. For example, for rice such as red rice, white rice, gomoku rice, chirashi sushi, various cooked foods, prepared dishes, curry, beef stew, gratin, pilaf, etc. A tray type is preferred. The cup type is suitable for liquid foods such as udon, ramen, oden, soups, and sake.

  If you want to make the container body 15 transparent single layer type, use polyvinyl chloride, styrene resin, polypropylene, if you want transparent multilayer type, if you want polypropylene / eval / polypropylene, aluminum foil type The outer surface protective paint / aluminum foil / heat seal lacquer and the outer surface protective paint / aluminum foil / polypropylene are preferable.

  The lid 18 covers the entire opening of the container body 15 to protect the contents and prevent the generated hot water vapor from leaking outside. In the case of form foods such as station lunches or catered lunches, it is sufficient to wrap the container body 15 and the lid 17 and then tie them with a string or rubber band.

  On the other hand, noodles such as curry, stew, liquid food, ramen, and udon are required to be completely sealed until the heating is completed, and so-called easy open (easy peel property) that allows the lid to be easily removed after heating is required. The In such a case, an EVA-based base material such as polystyrene, poly-α-methylstyrene or a styrene resin such as poly-α-methylstyrene or a dipentene polymer, or an aluminum foil is preferably applied.

  The heating device 1 is placed on the bottom wall 18 of the container body 15.

  The food tray 16 is polymerized in close contact with the upper surface of the heating device 1. As a result, the heat generated from the heating device 1 is transmitted to the food tray 16 by both conduction and convection, so that the thermal efficiency is improved.

  A small hole 20 is formed in the side wall 19 of the container body 15, and the tip 14 of the tear tape 7 of the heating device 1 is drawn out. When the tip 14 of the tear tape 7 is pulled out, the protective sheet 6 and the water bag 5 of the heating device 1 are cleaved almost simultaneously, an exothermic reaction is started, steam is generated, and the cooked rice 21 in the food tray 16 is The side dish 22 is heated.

  When all or part of the plastics used in the present invention is a readily hydrolyzable plastics having a hydrolyzable group in the main chain, an easily photodegradable plastics having a high photosensitivity group in the main chain, or the like. Since it is biodegraded, photodegraded and hydrolyzed in the natural environment after disposal, it contributes to resource saving and prevention of environmental pollution.

  Examples of readily degradable plastics suitable for use in the present invention include aliphatic polyester, polyoxyacid, polyurethane, polyamide, polyurea, polyanhydride, poly (amido-enamine), polyphosphazene, polyvinyl alcohol, polyvinyl acetate, polyacrylic. Examples thereof include acid esters, polyadipates, polyethylene decamethylene, tetramethylene polyadipates, polyprolactones, polyorthoesters, polycyanoacrylates, polycaprolactans, and the like.

Next, the actual manufacturing procedure of each part of the container shown in the figure will be specifically described with an example.
[Manufacture of portable food container body 15]
Using a three-layer laminate film of polypropylene / polyvinylidene chloride / polypropylene, a cup-shaped container body 15 having a depth of 12 cm, an opening diameter of 15 cm, and a bottom diameter of 10 cm was molded by a deep drawing vacuum molding machine.

[Manufacture of lid 17 for portable food container]
Using a two-layer laminate film of polyethylene terephthalate / polyvinylidene chloride, the lid 17 having the shape shown in FIG. 2 was molded with a vacuum molding machine.

[Manufacture of food tray 16]
Using a two-layer laminate film of unstretched polypropylene / polyvinylidene chloride, as shown in FIG. 2, a food tray 16 having a shape in close contact with the inner wall of the container body 15 was formed with a vacuum forming machine. A plurality of small holes into which water vapor rising from the heating device 1 enters were formed on the bottom surface of the food tray 16, and the rice 21, cooked fish, vegetables, kombu, fried egg, and hamburger 22 were removed.

[Manufacture of heating device 1]
[Manufacture of heating tray 2]
Using heat-resistant polypropylene (PP), a heating tray 2 having a depth of 18 mm, a length of 140 mm, a width of 140 mm, and a mass of 7.7 g was produced by a vacuum forming method.

[Manufacture of exothermic pack fixing plate 3]
A heating agent pack fixing plate 3 having an opening 9 having a length of 10 m and a width of 8 m was manufactured from a paper board having a thickness of 2 mm and a mass of 4.4 g manufactured by forging a fibrous material. A small hole was made in one end portion 10 of the fixing plate 3, and one end portion 11 of the tear tape 6 was penetrated, and the tear plate 6 was fixed so as not to be pulled out by the pulling operation.

[Manufacture of exothermic pack 4]
Powdered aluminum used: Yamaishi Metal Co., Ltd., trade name “Atomized Aluminum VA-200”)
Powdered quicklime used: manufactured by Chichibu Lime Industry Co., Ltd. (200 mesh, JIS special product)
Nonwoven fabric used: basis weight 60g / m ² , thickness 0.14mm, air flow rate 20cc / cm ² , sec, heat seal strength 6.0kg
15 grams of powdered aluminum and 10 grams of powdered quicklime are weighed and mixed uniformly, filled into a non-woven bag having a length of 8 cm, a width of 6 cm, a thickness of 4 mm and a mass of 0.9 g. Manufactured.

[Manufacture of water pack 5]
A bag having a width of 9 cm, a length of 14 cm, and a thickness of 4 mm and having a water pack cleaving protrusion 12 at the lower end was manufactured by ONY / PE and filled with 40 ml of water.

[Manufacture of protective sheet 6]
Since PP was used for the heat generating tray 2, the protective sheet 6 was manufactured by vacuum forming with ONY / AL / CPP.

[Manufacture of heating device 1]
The heat generating agent pack fixing plate 3 is put in order in the heat generating tray 2 manufactured in this way, and then the lower half 2 mm of the heat generating agent pack 4 is inserted into the opening 9 of the heat generating agent pack fixing plate 3. The water pack 5 was polymerized through a tear tape 7 having a length of 320 mm thereon. Next, the water pack tearing protrusion 12 formed at the lower end of the water pack 5 and the other end 13 of the heat generating agent pack fixing plate 3 were bonded via the tear tape 7. An extended portion of the tear tape 7 is projected from the upper end edge of the heat generating tray 2 and is heat-sealed to the upper end edge of the heat generating tray 2 together with the protective sheet 6, and the tear tape 7 is further inverted and bent. It joined to the surface of the protection sheet 6, and about 15 cm of the front-end | tip part was made into the free state. The total mass of the heating device thus produced was 79.1 g.

[Manufacture of portable food with heating device]
The heating device 1 manufactured in this way was accommodated in the bottom of the portable food container body 15 and the tip 14 of the tear tape 7 was passed through the small hole 21 formed in the side wall 19 of the portable food container body 15. Next, the food tray 16 was placed in contact with the protective sheet 6 of the heating device 1, and the portable food container main body 15 was sealed with the lid 17.

  The ekiben incorporating the heating device of the present invention manufactured in this way was selected at random for each age group from 10 to 6 years old who used the ekiben, and a total of 50 people were used as monitors. Selected and tested for water bag tearing. As a result, all infants succeeded in heating the station valve by breaking the water bag easily.

[Comparative Example 1]
For comparison, a conventional representative chemical exothermic agent using a single piece of quicklime (CaO) was used. It is a chemical exothermic agent that uses a single piece of quicklime (CaO) and requires 83 g of quicklime and 73 g of water to generate the same amount of heat as the exothermic agent that is based on a mixture of aluminum and quicklime used in the present invention. . After repeating several experiments, it is necessary to seal the heat generating tray with about 2.4 g of Al laminate in order to fill the tray with 83 g of quick lime so that the quick lime never absorbs moisture. I understood.

  Therefore, quicklime (83g), quicklime packaging bag (polyethylene, 50μ), water (7.7g), water bag (3g), heating tray (7.7g), mount (3g), sealing film (Al laminate + non-woven fabric) 2.4g), and a conventional heating device using a chemical heating agent mainly composed of quicklime (CaO) as a tension cord (length 320mm, 0.2g) was assembled, the total mass was 169.3g. It was. That is, it was about twice that of the embodiment of the present invention.

  The heating device manufactured in this way is set in a station valve container, and a break test of a quicklime packaging bag and a water bag is performed by pulling a pull string on a 10 to 6 year old person who uses the station valve. It was. As a result, there were many infants who could not break both the quicklime packaging bag and the water bag and those that could not break either one.

[Comparative Example 2]
Next, 83 g of quick lime is exposed and placed separately on the bottom of the heat generating tray (7.7 g), and a breakage string support material (3 g) is placed thereon, and further 70 g of water is applied to the Al laminate film (2 g). A filled water bag (72 g) was placed, a moisture-proof sheet made of an Al laminate film (2 g) was placed thereon, and the edge of the heating tray (7.7 g) was heat-sealed.

  As in Comparative Example 1, as a result of the tensile test, there were many infants that could not break either or both of the water bag made of Al laminate film and the moisture-proof sheet made of Al laminate film (2 g). It was.

  The heating device of the present invention is provided with an opening in which a lower half of the heat generating agent pack having a substantially elliptical cross section can be inserted in a plate made of an arbitrary material, and the lower half of the heat generating agent pack is inserted into the opening. Since the exothermic pack is fixed, pulling the tear tape from the outside of the container, tearing the water pack and starting the exothermic reaction does not move the exothermic pack. In comparison, the incidence of defective products is low, and the product itself becomes an object of commercial transactions as a self-contained product that is independent of itself, and the application can be expanded. In addition, the heating device of the present invention is about 80 g lighter than the conventional product of about 170 g, and has a structure in which an exothermic reaction surely occurs. The original light weight, functionality, convenience, storage, hygiene, and the like of the portable food container are improved, and the use of the portable food container with a heating function is expanded.

It is an exploded sectional view showing the composition of the 1 embodiment of the heating device of the present invention. It is sectional drawing of the container for portable foods incorporating the heating apparatus of this invention.

Explanation of symbols

1: Heating device 2: Heat generating tray 3: Heat generating agent pack fixing plate 4: Heat generating agent pack 5: Water pack 6: Non-breathable protective sheet 7: Tear tape 8: Heat generating agent pack lower half 9: Opening 10 : One end 11 of the heat generating agent pack fixing plate 3: the end portion 12 of the tear tape 12: the protrusion 13 for tearing the water pack 13: the other end 14 of the heat generating agent pack fixing plate 3: the tip 15 of the tear tape 15: for portable food Container body 16: Food tray 17: Lid 18: Bottom wall 19 of container body 15: Side wall 20 of container body 15: Small hole 21: Cooked rice 22: Side dish

Claims (4)

A heat generating pack in which a water-permeable bag is filled with a chemical heat generating agent and a water pack polymerized on the heat generating agent pack are accommodated in a heat generating tray that opens on the upper surface, and the upper surface opening of the heat generating tray is impermeable to moisture. A heating device of a type that is sealed with a protective sheet and tears the protective sheet and the water pack almost simultaneously by pulling out the tear tape from the outside of the container,
(1) The heating agent pack fixing plate provided with an opening is disposed in contact with the bottom wall of the heating tray, and the lower half of the heating agent pack is fitted into the opening to fix the heating agent pack.
(2) One end of the tear tape is fixed to one end of the heating agent pack fixing plate,
(3) A water pack cleavage protrusion is formed on the lower end of the water pack facing the one end of the heat generating agent pack fixing plate,
(4) The tear tape fixed to one end of the heat generating agent pack fixing plate passes between the heat generating agent pack and the water pack and is bonded to the water pack tearing protrusion, and the upper end edge of the heat generating tray Is pulled out from between the protective sheet and joined to the heat generating tray together with the protective sheet, the remainder is inverted and bent and fused to the surface of the protective sheet, and the remaining extension protrudes from the heat generating tray to the free end And (5) the heating device characterized in that the protrusion for water pack cleavage and the other end of the heating agent pack fixing plate are joined via a tear tape. The heating device according to claim 1, wherein a material of the heat generating agent pack fixing plate is cardboard. The exothermic agent is 100 mesh (-150 μm 90% or more) to 200 mesh (−75 μm 95% or more) powdered quicklime 15 to 30% and −330 mesh (−45 μm) 40 to 60% per mass of the exothermic agent. , +330 mesh (+45 μm) 15 to 30%, +235 mesh (+63 μm) 15%>, +200 mesh (+75 μm) 10%> The heating apparatus according to claim 1 or 2, wherein The container for portable foods incorporating the heating device according to any one of claims 1 to 3.

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