JP2008302049A - Chemical exothermic heater and portable food container with chemical exothermic heater - Google Patents

Abstract

In a chemical exothermic agent heating apparatus, water is prevented from leaking when a protective sheet is cleaved.
SOLUTION: A chemical heating agent pack 3, a tear tape 4 and a water pack 5 are closely polymerized in this order on the bottom wall 7 of the heating tray 2, and the top opening of the heating tray 2 is sealed with a protective sheet 6. Then, in the heat generating device of the type in which the protective sheet 6 and the water pack 5 are simultaneously cleaved by pulling out the tear tape 4 from the outside, the left and right sides sandwiching the notch 15 formed at the center of one end portion 14 of the water pack 5 The piece 16 is fixed to the bottom wall 7 of the heat generating tray 2, and the end portion 11 of the tear tape 4 is fixed to the bottom wall 7, and the extended portion is inserted between the heat generating agent pack 3 and the water pack 5. It is pulled out from between the upper edge 8 of the heat generating tray 2 and the protective sheet 6 through the notch 15, and the remaining portion is bent reversely to be a free end 12.
[Selection] Figure 1

Description

  The present invention relates to a chemical exothermic heat generating device and a portable food container equipped with a chemical exothermic heat generating device, and in particular, a chemical exothermic agent 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 heat generating device for generating heat and a portable food container incorporating the same.

  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. Yes.

Portable food containers come in various shapes and capacities, but small bottles have sake bottles and large ones have ekiben. The former is about 200 cm ³ and the latter is about 2000 cm ³ . Depending on the contents of the warmed food, for example, in the case of an ekiben, in order to appropriately heat both the staple food and the side meal, it must be heated to around 90 ° C., preferably above 90 ° C. and below 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, the exothermic agent used in the chemical exothermic exothermic device itself should have 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 required.

  Conventionally, various so-called chemical exothermic agents using exothermic reactions of chemical substances have been proposed. As a typical one, a type using a calcium oxide (quick lime) alone as a first generation, a type using a mixture of calcium oxide (quick lime) and an inorganic salt for suppressing heat generation, a third, As a generation, a type using a mixture of calcium oxide (quick lime) and aluminum, and as a fourth generation, a type using a mixture of calcium oxide (quick lime) and aluminum having a specific particle size distribution, etc. are mainstream.

  The type using a first generation calcium oxide (quick lime) alone uses heat generated by the reaction of calcium oxide and water. For the third generation and above, heat generated by the first stage reaction of calcium oxide and water, and heat generated by the second stage reaction of calcium hydroxide generated by the reaction of calcium oxide and water and aluminum are used. To do. Although these reaction behaviors are different in terms of chemical reaction, they are sometimes called “hydrothermal exothermic agents” because they use water as a medium. In the present specification, the chemical exothermic agent and the hydrothermal exothermic agent are synonymous.

  As described above, as the types and performances of chemical exothermic agents become rich, development of portable food containers incorporating chemical exothermic agents has also become active. Typical examples include a container containing cooked food and a heating device that contains a chemical exothermic agent and water necessary for the exothermic reaction. The tear tape is pulled from the outside of the heating device to cause an exothermic reaction. There is a so-called “tier tape type container”. The absolute requirements for a heat generating device used in a tiered tape container are that it must be small in volume, light in weight, good in heat generation efficiency, open a water bag with 100% establishment and be inexpensive. .

  In recent years, ekiben has abundant types and amounts of side dishes, and containers for momentum foods are also becoming larger. When the amount of food to be heated is doubled, the amount of water required for the exothermic agent and exothermic reaction must also be doubled by simple calculation. However, it is impossible to increase the volume of the heat generating device according to the amount of food to be heated, that is, to prepare several types of heat generating devices having different volumes because the absolute conditions are not satisfied. Therefore, the most difficult point in the development of the heat generating device used for the tier tape type container is how to store different amounts of heat generating agents and water necessary for the exothermic reaction in one type of heat generating device. The heat generation efficiency is good, and whether the water bag can be cleaved with a probability of 100%.

Hereinafter, some conventional techniques will be considered from the viewpoint of the absolute condition.
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 has a heat-generating bag filled with quicklime in a non-permeable bag made of a synthetic resin film such as polyethylene on a mount made of cardboard, and a non-water-permeable made of a synthetic resin film such as polyethylene. Water bags filled with water are stacked in this order, and the breaking string that breaks both the heating bag and the water bag is locked to one end of the mount. The bag is fixed to both ends of the bag, accommodated in a heating container, the breaking string is passed through a pull-out hole provided on the side surface of the heating container, and the breaking string is pulled out from the outside to break the heating bag and the water bag. It is like that.

  Since the calorific value due to the reaction between calcium oxide and water is as small as 15.2 kcal, the temperature is quickly raised to 90 ° C. or higher and 100 ° C. or lower after the reaction, and is kept at 60 ° C. or higher for at least 20 minutes required for eating. Requires a large amount of calcium oxide. In order to heat a standard portable food with the heating container described in Patent Document 1, 60 to 100 g of calcium oxide is required.

  By the way, the polyethylene film for packaging the exothermic agent is (i) the cheapest among plastic films, (b) can be easily heat-sealed and can be completely sealed, (c) good water resistance and moisture resistance, (D) It is light and has high tear strength.

  The polyethylene film has a high tear strength but is also difficult to tear, which is a drawback in the case of a tear tape type heating container. The reason for this is that calcium oxide is extremely hygroscopic, and if left untreated, it absorbs moisture and carbon dioxide in the air and changes to calcium hydroxide and calcium carbonate. This is because no reaction occurs.

  In particular, when the exothermic agent used in the heating container described in Patent Document 1 is composed of a large amount of 100 g of calcium oxide, when a part thereof 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 / 25 μ for the low density polyethylene film, 100 to 600 g / 25 μ for the medium density polyethylene film, and the high density polyethylene as measured by Elmendorf ASTM D1922. The film is 30-600 g / 25μ. In the case of a breakable string pull-out type heating container, this tear strength is a strength that is difficult for a young person or a woman to tear, and the breakable string may break along the way.

  Moreover, in the case of the heating container described in Patent Document 1, an exothermic reaction does not occur unless both the water bag and the heat generating bag are simultaneously broken. Therefore, there is a high risk that defective products will occur.

  Patent Document 2 outlines, in a case having an opening, a heating agent that generates heat by a hydration reaction and a water bag filled with water, and a breaking string for breaking the water bag; A heating unit that is housed in the case and includes a breaking support material that supports one end of the breaking string, and a moisture-proof sheet is attached to the opening of the case, and the breaking string The other end passes through the portion of the water bag not filled with water, passes through the moisture-proof sheet, is pulled out of the case, and pulls the other end of the breaking string pulled out of the case Thus, a heating unit that simultaneously breaks the moisture-proof sheet and the water bag is disclosed.

  The drawback of the heating unit described in Patent Document 2 is that a breakage support material is used to support the water bag and to fix the water bag breakage string. The support material for breakage is a hard material and is manufactured in a shape smaller than the water bag, one end of which is fixed to the end of the water bag, and the center of the other end is for breakage. A notch for locking one end of the string is formed. In order to set the water bag and the breakage support material, a knot larger than the maximum opening diameter of the cut portion is formed in advance at one end of the breakage string, and then the heat of the water bag is fixed by a fixture such as a stapler. One end portion of the breakage support material is fixed to the welded portion, and one end of the breakage cord is passed through the notch formed at the center of the other end portion of the breakage support material, and locked at the knot. This requires a complicated procedure that cannot be automated.

  As described above, the heating unit described in Patent Document 2 requires an auxiliary member called a breakage support material for breaking the water bag, and further complicated procedures for setting the water bag and the breakage support material. Therefore, material costs and labor costs required for installation are added, greatly increasing the overall cost of the heating unit, which must be inexpensive.

  Although not a patent document, an overhang is provided on the inner surface of the central portion of the side wall of the heat generating tray, and the back of the end of the water pack filled with heat generating water is joined to the overhang by eyelet or hot melt. There has also been proposed a chemical heating agent heating device in which the upper surface opening of the heating tray is sealed with a moisture-impermeable protective sheet.

  A major feature of this prior art is that a protruding portion having a predetermined width is provided on the inner surface of the side wall of the heating tray, and the back surface of one end of the water pack and the protruding portion are joined and fixed. Since it has a simple structure with only the heat-generating agent pack placed underneath, the water pack sits stably in the overhanging part and sits well, eliminating the need for a fixing plate for fixing the heat-generating agent pack required by the prior art, The manufacturing process is simplified, and the manufacturing cost is greatly reduced.

  On the other hand, in the case of this structure, in the heat generating tray, the volume occupied above the overhanging portion, that is, the volume applied to the water pack is reduced. As a result, the upper surface of the water pack becomes very close to the protective sheet, and the following phenomenon may occur. When the tear tape is pulled, the protective sheet is first cleaved, and then the water pack is cleaved. At this time, the water pack cleaving mechanism that fixes one end of the tear tape is separated from the cleavage surface of the protective sheet. May rise up.

When the amount of the heat generating agent is small and therefore the volume of the water pack is small, this phenomenon occurs less frequently, but as the amount of the heat generating agent increases and the volume of the water pack increases, the frequency of this phenomenon occurs. Get higher. As a result, part of the water in the water pack flows out of the heating tray along the protective sheet. The amount of water for the reaction of the chemical exothermic agent is almost accurately weighed according to the stoichiometry, so if the amount of water decreases, a part of the exothermic agent remains unreacted and the exothermic efficiency decreases. .
Japanese Patent Laid-Open No. 11-292155 JP 2000-360439 A

  The problem to be solved by the invention is to store a heat-generating agent pack in which a heat-permeable agent is filled in a water-permeable nonwoven fabric bag together with a water pack in a heat-generating tray that opens on the top surface, A protective sheet, a heat-generating type chemical heating agent heat-sealed together with a tear tape that simultaneously cleaves the water pack and the protective sheet. By eliminating the need for incidental members such as materials, it is possible to reduce the risk of incomplete heat generation with a simple structure, to facilitate the manufacturing process, and to reduce manufacturing costs.

  Another problem to be solved by the invention is that a heat generating agent pack in which a heat-permeable agent is filled in a water-permeable nonwoven fabric bag is stored together with a water pack in a heat generating tray that opens on the upper surface, and the upper opening opening edge of the heat generating tray In a chemical exothermic heating device of the type heat-sealed together with a tear sheet that tears the water pack and the protective sheet at the same time with a protective sheet, water is removed when the protective sheet and the water pack are simultaneously cleaved by pulling the tear tape. The pack tearing mechanism prevents the protective sheet from rising above the tearing surface of the protective sheet, so that the entire amount of water filled in the water pack is dropped on the heat generating tray and reacted with the heat generating agent, thereby improving the heat generation efficiency. Is to increase.

The above problems are solved by the configurations described in the following items.
1. A heat generating pack in which a water-permeable bag is filled with a chemical heat generating agent, a tear tape, and a water pack are adhered and polymerized in this order to the bottom wall of the heat generating tray, and the heat generating tray is opened. This is a chemical exothermic heating device of the type that seals the top opening with a non-breathable protective sheet and simultaneously tears off the protective sheet and the water pack by pulling out the tear tape from the outside of the container. A notch is formed in the center of the end, the left and right pieces sandwiching the notch are fixed to the bottom wall or side wall of the heating tray, and one end of the tear tape is fixed to the bottom wall of the heating tray. Place the heat-generating agent pack on top, attach the tear tape extension to the surface of the heat-generating agent pack, polymerize the water pack, protect the tear tape through the notch and the upper edge of the heating tray Shi Is pulled out from between the bets, joined to the heating tray with the protective sheet, it inverts bent residual chemical exothermic agents heating apparatus the free end of the extension balance.

2. A portable food container equipped with a chemical heating agent heating device, incorporating the chemical heating agent heating device described in 1 above at the bottom, placing a food tray on top of the chemical heating agent heating device, and providing it on the side wall of the portable food container A portable food container with a chemical heating agent heating device, wherein a free end of a tear tape of the chemical heating agent heating device is passed through a small hole.

According to the first aspect of the invention, the following effects can be achieved.
1. Since the water pack itself is fixed to the bottom wall or side wall of the heat generating tray, there is no need for an auxiliary member such as a support material for supporting the water pack, which has been required in the past, and the manufacturing process is simplified and the manufacturing process is simplified. Cost can be reduced.

2. A notch is formed in the approximate center of one end of the water pack, and the left and right pieces sandwiching the notch are fixed to the bottom wall or side wall of the heating tray. The adhesion area between the water pack and the bottom wall or side wall of the heating tray does not move during use of the chemical heating agent heating device or during use. Therefore, insert the tear tape through the notch, pull it out from between the upper edge of the heat generating tray and the protective sheet, join it to the heat generating tray together with the protective sheet, reverse bend the remainder, and freely extend the remaining extension With a simple structure at the end, both the water pack and the protective sheet can be cleaved simultaneously.

3. The water pack itself is fixed to the bottom wall or side wall of the heating tray, and the water pack is completely fixed at a low position near the bottom wall of the heating tray, so pull the tear tape to remove the protective sheet and the water pack. At the same time, the water pack does not stand up above the cleavage surface of the protective sheet at the same time, so that the entire amount of water filled in the water pack can be dropped on the heating tray, and the heat generation efficiency Can be increased.

4). Since the water pack itself is fixed to the bottom wall of the heat generating tray, the capacity for storing the heat generating agent pack and the water pack is increased, it can be used effectively, and it can handle various amounts of heat generating agent and water. This expands the versatility of the heat generating tray.

  According to the invention of claim 2, the original functionality, convenience, storage property, hygiene retention and the like of the portable food container are improved, and the use of the portable food container with a heating function is expanded.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
1 is an exploded sectional view showing the configuration of an embodiment of the present invention, FIG. 2 is a sectional view, FIG. 3 is a plan view, and FIG. 4 is a sectional view of a portable food container incorporating a chemical heating agent heating device. It is.

  The chemical heating agent heating device 1 of the present invention mainly comprises a heating tray 2, a heating agent pack 3, a tear tape 4, a water pack 5, and a protective sheet 6.

  The exothermic tray 2 has a width and depth that allows the exothermic pack 3 and the water pack 5 to be superposed and placed in this order on the bottom wall 7 thereof. The upper peripheral edge portion 8 of the heating tray 2 is a seal portion for joining, for example, heat sealing together with the protective sheet 6. This width is not particularly limited by numerical values, but at least 5 mm is necessary. If this width is small, the sealing strength is weak, and if it is large, it is strong. In particular, if the seal width is too small, it becomes weak when the same part is contaminated. Conversely, if the seal width is too large, wrinkles are likely to occur. Therefore, it is necessary to select the width of the upper edge portion 8 appropriately.

  The most reliable joining method between the heating tray 2 and the protective sheet 6 is heat sealing. Therefore, each material must be selected so that the heat generating tray 2 and the protective sheet 6 can be heat sealed.

  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, etc. 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.

  Since the present invention is characterized by the structure of the heat generating device, the heat generating agent 10 filled in the heat generating agent pack 3 is not particularly limited as long as it is a substance that reacts with water and generates heat. That is, a type that uses a single product of calcium oxide (quick lime) that is a first generation exothermic agent, a type that uses a mixture of calcium oxide (quick lime) that is a second generation exothermic agent and an inorganic salt for suppressing heat generation, and a third generation. Any type that uses a mixture of calcium oxide (quick lime) that is a heat generating agent and aluminum, a type that uses a mixture of calcium oxide (quick lime) that is a fourth generation heat generating agent and aluminium having a specific particle size distribution, etc. You can choose. However, it is ideal that the heat generating agent pack 3 accommodated in the small heat generating tray 2 having a limited volume is as small as possible and has high thermal efficiency. From that point of view, it is preferable to use a third generation or more exothermic agent.

  The exothermic pack 3 is manufactured by, for example, uniformly mixing powdered calcium oxide and powdered aluminum at a predetermined blending amount and filling a bag of water-permeable paper or cloth. Of course, before the heat-generating agent pack 3 is circulated, that is, before being set in the heat-generating tray 2, it is completely sealed in a moisture-impermeable bag made of aluminum foil or an aluminum vapor-deposited film and set in the heat-generating tray 2. Immediately before, the sheet is taken out from a non-moisture permeable bag made of aluminum foil or an aluminum vapor deposited film and set on the heat generating tray 2. Finally, since it is sealed with the non-moisture permeable protective sheet 6, the protective sheet 6 The exothermic pack 3 does not absorb moisture until is cleaved.

  The tear tape 4 of the present invention has one end portion 11 fixed to the bottom wall 7 of the heating tray 2 to form a fixing point 12, and the other end portion is a free end through a procedure described later. 13 The term “tear tape” used in the present invention includes a string of string, a string such as a monofilament, or a string.

  The method for fixing one end 11 of the tear tape 4 to the bottom wall 7 of the heating tray 2 is not particularly limited. For example, arbitrary methods, such as an adhesive agent, adhesion | attachment by a double-sided adhesive tape, a heat seal, can be selected. However, heat sealing is preferable from the viewpoint of mass production and adhesive strength. In the case of heat sealing, it is preferable to use the same material as the tear tape material and the material of the outermost surface of the heating tray 2.

  The water pack 5 is a so-called easy-open type or easy-peel type in which the water pack 5 is cleaved by being pulled from the outside of the chemical exothermic heat-generating device 1 with an appropriate force, and the water therein flows out quickly.

  Since the powdered calcium oxide filled in the heat generating agent pack 3 has a property of reacting immediately after only absorbing the humidity in the air, the material of the water pack 5 must be impermeable to moisture. .

Hereinafter, materials suitable for the water pack 5 of the present invention will be described.
When the partial pressure of water vapor (humidity) on both sides of the film of thickness L and surface area A is P1 and P2, respectively, when the amount of humidity that permeates 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 unit of the moisture vapor transmission rate (WVTR) of the water vapor permeation amount q in a unit area and unit time of the film under a specific condition is g · m ⁻² · 24h ⁻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 to 15, more preferably in the range of 0.3 to 7, most preferably in the range of 0.3 to 3. .

  Suitable films for the water pack 5 of the present invention include 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.

  As a laminate film suitable for the water pack 5 of the present invention, 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, steel foil / polypropylene, and the like.

  The film suitable for the water pack 5 can be arbitrarily selected from the viewpoint of the cleavage mechanism, such as a film using an interfacial peeling type, a film using an interlayer peeling type, and a film using a cohesive peeling type. However, the cohesive peeling type is preferable from the viewpoint of the stability of the seal, the interface peeling type is preferable from the viewpoint of the line sealing property, and the interface peeling type is preferable from the state of the peeling surface.

  The water pack 5 of the present invention is filled with water that has been accurately calculated based on the stoichiometry and weighed into a bag that is made of the film exemplified above and has an open end. Manufactured.

  In the water pack 5 of the present invention, a notch 15 for inserting the tear tape 4 is formed substantially at the center of one end portion 14 of the water pack 5. Both ends 16.17 sandwiching the notch 15 are fixed to the bottom wall 7 or one side wall 9 of the heating tray 2. The fixing method is not particularly limited. For example, an arbitrary method such as an adhesive, adhesion using a double-sided pressure-sensitive adhesive tape, or heat sealing can be selected. However, heat sealing is preferable in terms of mass production and adhesive strength. In the case of heat sealing, it is preferable to use the same material for the outermost surface of the water pack 5 and the outermost surface of the heating tray 2.

  In order to heat-seal the back surface of both ends 16.17 of the water pack 5 across the notch 15 and the bottom wall 7 or the side wall 9 of the heating tray 2, the melting point and the fluidity at the time of melting are important. The melting point of polyethylene (high pressure) is 105 to 115 ° C., the melting point of polyethylene (low pressure) is 132 ° C., the melting point of polypropylene is 160 to 170 ° C., the melting point of polyvinyl chloride (hard) is 170 ° C., and the melting point of polyvinyl chloride is 190 ° C. The melting point of 6-nylon is 223 ° C, the melting point of polycarbonate is 222-230 ° C, the melting point of polystyrene is 230 ° C, the melting point of polyethylene terephthalate is 260 ° C, and the melting point of 66-nylon is 265 ° C. The lower the sealing temperature, the longer the sealing time and the wider the allowable time range. Conversely, the higher the sealing temperature, the shorter the sealing time and the narrower the allowable time range. Therefore, it is important to select the material of the water pack 5 and the material of the heating tray 2 in consideration of these melting points and manufacturing costs.

  The heating agent pack 3 manufactured in this way is attached to the bottom wall 7 of the heating tray 2 so as to cover the fixing point 12 between one end 11 of the tear tape 4 and the bottom wall 7 of the heating tray 2. set. Next, the tear tape 4 is brought into close contact with the heat generating agent pack 3, and the water pack 5 is polymerized thereon. Next, the tear tape 4 is inserted into the notch 15 and pulled out from between the upper edge 8 of the heat generating tray 2 and the protective sheet 6, joined to the heat generating tray 2 together with the protective sheet 6, and the remainder is inverted and bent. The end portion 12 is a free end.

  FIG. 4 is a cross-sectional view of a portable food container 18 incorporating the chemical heating agent heating device 1 of the present invention. 4, the same elements as those in FIGS. 1 to 3 are denoted by the same reference numerals, and the description thereof is omitted.

  The container main body 19 accommodates the chemical heating agent heating device 1 and the food tray 20 from below. The cross-sectional shape of the container body 19 varies depending on the type of food. For example, in the case of cooked 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. A cup type is suitable for liquid foods such as udon, ramen, oden, soups and sake.

  If you want to make the container body 19 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 21 covers the entire opening of the container body 19 to protect the contents and prevent the generated hot water vapor from leaking to the outside. In the case of form foods such as station lunches or catered lunches, it is sufficient to wrap the container body 19 and the lid 21 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) is required so that the lid can be easily removed after heating. Is done. 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 chemical heating agent heating device 1 is placed on the bottom wall 22 of the container body 19.

  The food tray 20 is polymerized in close contact with the upper surface of the chemical exothermic agent heating device 1. As a result, heat generated from the chemical heating agent heating device 1 is transmitted to the food tray 20 by both conduction and convection, so that the thermal efficiency is improved.

  A small hole 24 is provided in the side wall 23 of the container body 19, and the tip 12 of the tear tape 4 of the chemical heating agent heating device 1 is drawn out. When the tip 12 of the tear tape 4 is pulled out, first, the protective sheet 6 of the chemical exothermic agent heating device 1 is cleaved, and then the water bag 5 is cleaved.

  The present invention is different from the prior art in which one end portion of the water pack is tied to the tear tape, and the water pack 5 has both end portions 16 and 17 sandwiching the notch 15. Since it is fixed to the bottom wall 7 or one side wall 9 of the heat generating tray 2, the water pack 5 does not stand up from the split along with the cleavage of the protective sheet 6, and is completely cleaved in the heat generating tray 2. The total amount of water filled in the water pack 5 reacts with the exothermic agent.

  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 polyesters, polyoxyacids, polyurethanes, polyamides, polyureas, polyanhydrides, poly (amido-enamines), polyphosphazenes, polyvinyl alcohol, polyvinyl acetate, polyacrylates. Polyadipic acid ester, polyethylene decamethylene, polyadipic acid tetramethylene, polyprolactone, polyorthoester poly, polycyanoacrylic acid ester, polycaprolactan 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 19]
Using a three-layer laminate film of polypropylene / polyvinylidene chloride / polypropylene, a cup-shaped container body 19 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 21 for portable food container]
Using a two-layer laminate film of polyethylene terephthalate / polyvinylidene chloride, the lid 21 having the shape shown in FIG. 2 was molded with a vacuum molding machine.

[Manufacture of food tray 20]
Using a two-layer laminate film of unstretched polypropylene / polyvinylidene chloride, as shown in FIG. 2, a food tray 20 having a shape in close contact with the inner wall of the container body 19 was formed with a vacuum forming machine. A plurality of small holes into which water vapor rising from the chemical heating agent heating device 1 is formed are formed on the bottom surface of the food tray 20, and rice 25 and cooked fish, vegetables, rice cakes, fried eggs, and hamburgers 26 are placed therein.

[Manufacture of chemical exothermic heater 1]
[Manufacture of heating tray 2]
A heating tray 2 having a mass of 7.7 g and a depth of 18 mm, a length of 140 mm, and a width of 140 mm was produced by PP using a vacuum forming method.

[Manufacture of exothermic pack 3]
Powdered aluminum used: manufactured by Yamaishi Metal Co., Ltd., trade name “Atomized Aluminum VA-185”)
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, a thickness of 4 mm and a mass of 0.9 g and having one end opened was filled with PP film and filled with 40 ml of water. The end portion 14 having a width of 20 mm was fixed by heat sealing and sealed. A notch 15 was formed in the approximate center of the fixed portion 14.

[Manufacture of protective sheet 5]
Since PP was used for the exothermic tray 2, 1.1 g of the protective sheet 6 was manufactured by vacuum forming with ONY / AL / CPP.

[Manufacture of chemical exothermic heater 1]
One end 11 of the tear tape 4 was fixed to the bottom wall 7 of the heating tray 2 manufactured in this way by heat sealing to form a fixing point 12. Next, the heating agent pack 3 is placed so as to cover the fixing point 12 by heat sealing between the end portion 11 of the tear tape 4 and the bottom wall 7 of the heating tray 2, and the extended portion of the tear tape 4 is placed thereon. The water pack 5 was polymerized. Next, the tear tape 4 was inserted through the notch 15 of the water pack 5, and both ends 16 and 17 sandwiching the notch 15 were fixed to the bottom wall 7 of the heating tray 2 by heat sealing.

  The remaining portion of the tear tape 4 is protruded from the upper end edge 8 of the heat generating tray 2 and is heat-sealed to the upper end edge 8 of the heat generating tray 2 together with the protective sheet 6. The remaining end 12 of about 15 cm was made free by bending inversion. The total mass of one of the chemical exothermic heaters thus produced was 79.1 g.

[Manufacture of portable food with chemical exothermic heater]
The chemical heating agent heating device 1 manufactured in this way is housed in the bottom of the portable food container main body 19 and the other end 12 of the tear tape 4 is formed in the small hole 24 formed in the side wall 23 of the portable food container main body 19. Penetrated from. Next, the food tray 20 was placed in contact with the protective sheet 6 of the chemical heating agent heating device 1, and the portable food container main body 19 was sealed with a lid 21.

  1000 chemical exothermic heat-generating devices 1 manufactured in this way are manufactured, and among the age groups that use ekiben, there are 20 young users aged 6-10 years old, users aged 11-20 years old 20 people, 21 to 50 years old users, 51 to 70 years old 20 users, 71 to 90 years old 20 people randomly selected regardless of gender, and a test to pull the tear tape 10 I went twice. As a result, the case where the water pack could not be broken and the case where the water pack rose upward from the cleavage surface of the protective sheet were also zero.

  Since this cleavage test covers almost all of the low-age to high-age groups using ekiben, the chemical exothermic heat generating device 1 of the present invention is an absolute requirement for a heat generating device used for a tier tape type container. It was proved that they were all satisfied that it was necessary to cut the water bag at a probability of 100% and to be inexpensive, as the general conditions were as small as possible, light weight, good heat generation efficiency.

  In the chemical heating agent heating device of the present invention, a heating tray having a top opening, a heating agent pack in which a chemical heating agent is filled in a water-permeable bag, a tear tape, and a water pack are provided on the bottom wall of the heating tray. This type of adhesion is polymerized in this order, and the top opening of the heat generating tray is sealed with a moisture-impermeable protective sheet, and the protective sheet and water pack are simultaneously cleaved by pulling out the tear tape from the outside of the container. In a chemical heating agent heating device, a notch is formed in the approximate center of one end of the water pack, and the left and right pieces sandwiching the notch are fixed to the bottom wall or side wall of the heating tray, and one end of the tear tape Is fixed to the bottom wall of the heating tray, the extension of the tear tape is inserted between the heating agent pack and the water pack, and the notch is inserted between the upper edge of the heating tray and the protective sheet. In spite of the simple structure of joining the heating sheet together with the protective sheet, flipping the remainder, bending the extension remaining part from the small hole provided in the heating tray, and making it a free end, The effects exemplified below can be achieved.

1. Unlike the prior art, where one end of the water pack is tied to the tear tape, the water pack has two ends on both sides of the notch. Since it is fixed to the bottom wall or one side wall of the heat generating tray, the water pack does not stand up from the tear when the protective sheet is broken, and is completely cleaved in the heat generating tray and filled into the water pack. Since the total amount of water reacts with the exothermic agent, the heat generation efficiency is improved.

2. A fixing plate for fixing the heat generating agent pack required by the prior art becomes unnecessary, the manufacturing process is simplified, and the manufacturing cost is greatly reduced.

3. By pulling the tear tape from the outside of the heat generation container, it is only necessary to cleave the water pack in the heat generation tray. Therefore, compared to the conventional technology that cleaves both the water pack and the heat generation agent pack, the structure is It is simple and the occurrence rate of defective products is greatly reduced or almost completely eliminated as compared with the conventional one.

4). Therefore, it becomes an object of commerce as an independent self-contained product itself, and the use can be expanded.

  In addition, the chemical heating agent heating device of the present invention improves the original functionality, convenience, storage, hygiene retention, etc. of the portable food container, so that the application of the portable food container with a heating function is expanded. .

The exploded sectional view showing the composition of the 1 embodiment of the chemical exothermic agent heating device of the present invention. Sectional drawing which shows the structure of one Embodiment of the chemical exothermic agent heat generating apparatus of this invention. The top view which shows the structure of one Embodiment of the chemical exothermic agent heat generating apparatus of this invention. Sectional drawing of the container for portable foods incorporating the chemical heat generating agent heat generating apparatus of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Chemical exothermic heat generating apparatus 2 Heat generating tray 3 Heat generating agent pack 4 Tier tape 5 Water pack 6 Non-moisture permeable protective sheet 7 Heat generating tray bottom wall 8 Heat generating tray upper edge 9 Heat generating tray side wall 9 Heat generating agent 10 Heat generating agent 11 One end of tear tape 12 Other end of tear tape 13 Adhering point between tear tape and bottom wall of heating tray 14 One end of water pack 15 Notch of water pack 16 Adjacent to notch of water pack One piece 17 The other piece 18 adjacent to the notch of the water pack 18 Portable food container body 19 incorporating a chemical heating agent heating device Portable food container body 20 Food tray 21 Lid 22 Bottom wall 23 of the container body 19 Container body 19 Side wall 24 Small hole 25 Cooked rice 26

Claims (2)

A heat generating tray (2) having a top opening and a heat generating agent pack (3) filled with a water-permeable bag with a chemical heat generating agent (10), a tear tape (4), and a water pack (5) are a heat generating tray. The bottom wall (7) of (2) is intimately polymerized in this order, and the upper surface opening of the heating tray (2) is sealed with a moisture-impermeable protective sheet (6), and the tear tape (4 ) Is a chemical heating device that simultaneously cleaves the protective sheet (6) and the water pack (5),
A notch (15) is formed in the center of one end (14) of the water pack (5), and the left and right pieces (16, 17) sandwiching the notch (15) are connected to the bottom wall of the heating tray (2) ( 7) or the side wall (9), and one end (11) of the tear tape (4) is fixed to the bottom wall (7) of the heating tray (2), and the heating agent pack (3 ), The extension portion of the tear tape (4) is brought into close contact with the surface of the heat generating agent pack (3), the water pack (5) is polymerized, and the tear tape (4) is attached to the notch (15). After that, it is pulled out from between the upper edge (8) of the heat generating tray (2) and the protective sheet (6), joined to the heat generating tray together with the protective sheet (6), the remainder is inverted and bent, and extended. Chemical exothermic heat generator with the remaining part as a free end. A portable food container (18) with a chemical heating agent heating device, the chemical heating agent heating device (1) according to claim 1 incorporated in the bottom, and a food tray (20) placed on top of the chemical heating agent heating device. Then, the chemical that penetrates the free end (12) of the tear tape (4) of the chemical heating agent heating device (1) from the small hole (24) provided in the side wall (23) of the portable food container (18). Portable food container with exothermic heating device.

Images