US20100147282A1 - Food Heating Device - Google Patents

Food Heating Device Download PDF

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Publication number
US20100147282A1
US20100147282A1 US12/085,887 US8588707A US2010147282A1 US 20100147282 A1 US20100147282 A1 US 20100147282A1 US 8588707 A US8588707 A US 8588707A US 2010147282 A1 US2010147282 A1 US 2010147282A1
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United States
Prior art keywords
water
heat
food
amount
bag
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US12/085,887
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English (en)
Inventor
Yukio Urume
Hisao Kimura
Mikio Takaiwa
Yukako Kumagai
Yumiko Mine
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Mycoal Co Ltd
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Mycoal Co Ltd
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Assigned to MYCOAL CO., LTD. reassignment MYCOAL CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KIMURA, HISAO, KUMAGAI, YUKAKO, MINE, YUMIKO, TAKAIWA, MIKIO, URUME, YUKIO
Publication of US20100147282A1 publication Critical patent/US20100147282A1/en
Abandoned legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K5/00—Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion
    • C09K5/16—Materials undergoing chemical reactions when used
    • C09K5/18—Non-reversible chemical reactions
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J36/00—Parts, details or accessories of cooking-vessels
    • A47J36/24—Warming devices
    • A47J36/28—Warming devices generating the heat by exothermic reactions, e.g. heat released by the contact of unslaked lime with water
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D81/00—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents
    • B65D81/34—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents for packaging foodstuffs or other articles intended to be cooked or heated within the package
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D81/00—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents
    • B65D81/34—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents for packaging foodstuffs or other articles intended to be cooked or heated within the package
    • B65D81/3484—Packages having self-contained heating means, e.g. heating generated by the reaction of two chemicals
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K5/00—Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion
    • C09K5/16—Materials undergoing chemical reactions when used

Definitions

  • the present invention relates to a food heating device to heat a food (cooked food such as a retort-packed food and canned drink) using a heat source activated by reaction with water. More particularly, it relates a food heating device improved in heat-generating property when temperature of water to be used is low.
  • a heat source activated by reaction with water As a heat source activated by reaction with water, a mixture of aluminum powder and calcium oxide powder has been popularly used for a heat-generating composition (referring to Patent literature 1, for example). And, a food heating device to heat a lunch bag or Japanese sake, or to re-heat a cooked food such as a retort-packed food in emergency situations, which uses the heat source, has been also known.
  • the calcium oxide powder is reacted with the water to generate heat and also calcium hydroxide produced by the reaction is reacted with the aluminum powder to generate heat.
  • the group of reactions makes it possible to generate enough amounts of heat to warm the food within a short period.
  • the above Japanese Patent shows that the disclosed heat-generating composition generates heat of about 100° C. after about 30 seconds from the reaction and the temperature is kept for 20 minutes or longer. And, the heat-generating composition has advantages in which it reacts without generating odor, and a small amount of the composition is enough for generating sufficient amounts of heat.
  • Patent literature 1 Japanese Patent number 3467729
  • the heat-generating composition is enclosed in an inner bag made by nonwoven fabric and further tightly enclosed in a watertight outer bag.
  • the enclosed heat-generating composition is taken out of the outer bag and comes in contact with water, resulting in that the heat-generating composition in the inner bag contacts the water to be reacted.
  • the water permeates the inner bag made by nonwoven fabric and reacts with the heat-generating composition in the inner bag.
  • the faster the water contacts the heat-generating composition the faster the heat-generating reaction proceeds.
  • the generated heat diffuses through the heated water and water vapor.
  • the higher the water permeability of the inner bag is, the faster the rate of the heat diffusion is.
  • Such a food heating device is sometimes used under a condition in which temperature of the water to be reacted is low. Therefore, such a food heating device is required which has excellent heat-generating abilities (rate of temperature rise, heat retaining period and the like) even under a condition in which temperature of the water to be reacted is low.
  • a food heating device comprises a heat source and a container having an exhaust vent, in which said heat source is put in said container together with a food to be heated and water is added to said container so that said heat source is reacted with said water to generate heat and to heat the food by the generated heat.
  • said heat source comprises: a bag formed by a packing material made of a base material of nonwoven fabric of which one surface is laminated with a waterproof layer, said packing material being punched with a plurality of pinholes, and a heat-generating composition containing aluminum powder in an amount of 40 to 60% by weight, calcium hydroxide powder in an amount of 10 to 40% by weight and calcium oxide powder in an amount of 10 to 40% by weight, enclosed in said bag, said packing material has a water permeable rate of 13 to milliliter/min/1 cm 2 measured under the following measurement conditions (1) to (4):
  • NaOH and KOH can not be used as an alkaline material because of the poisonous property.
  • substances which are easily dissociated by hydrolysis are also not suitable for heating a retort-packed rice and the like because the reaction terminates quickly. It means that an amount of heat which is discharged out of the food heating device is so large that the reaction can not proceed continuously.
  • calcium hydroxide as an alkaline material in view of cost and manufacturing method.
  • the proceeding of the heat-generating reaction can be controlled. That is, when a water permeable rate of the inner bag is set to 13 to 81 milliliter/min/1 cm 2 , preferably 13 to 65 milliliter/min/1 cm 2 , and more preferably 22 to 44 milliliter/min/1 cm 2 measured when head of water is 27 cm, preferable heating conditions including rate of temperature rise of a food, risen temperature and duration of the risen temperature under conditions in which a food heating device is typically used can be obtained. And, leakage of the heat-generating composition from the bag can be prevented.
  • the heat-generating composition contains calcium oxide powder in an amount of 10 to 40% by weight.
  • the calciumoxide (CaO) causes the following hydration reaction
  • the hydration reaction also generates heat and the produced Ca(OH) 2 reacts with aluminum to generate heat because it is an alkaline material. Accordingly, rate of temperature rise becomes fast.
  • the heat-generating composition contains aluminum powder in an amount of 40 to 60% by weight and calcium oxide powder in an amount of 10 to 40% by weight.
  • a heating device in which a heat-generating composition containing aluminum powder and calcium oxide (CaO) powder is reacted with water to generate heat has been widely known.
  • the present inventors have found that an addition of calcium hydroxide (Ca(OH) 2 ) to the above heat-generating composition allows an excellent heat-generating abilities even if temperature of water to be reacted is low.
  • a heat-generating composition it becomes possible to accomplish a request for-heating a food (retort-packed cooked curry or rice, 350-milliliter plastic bottled tea and the like) to 40° C. or higher after 5 minutes from the heat-generating reaction, to 60° C. or higher after 10 minutes and to keep the temperature after 20 minutes when temperature of water to be reacted is low as 5 to 30° C. (an environmental temperature is ⁇ 10 to 40° C.), for example.
  • nonwoven fabric examples include natural fabric such as cotton and wool; regenerated fiber such as viscose (rayon) and cupra; polyamide such as nylon 6, nylon6,6; straight-chain or branched polyesters having 20 or less carbon atoms such as polyethylene terephthalate, polytrimethylen terephthalate, polybutylene terephalate, polylactic acid and polyglycolic acid; polyolefins such as polyethylene and polypropylene; and synthetic fiber such as acrylic. Two or more kinds of those materials may be used together.
  • the nonwoven fabric may be made by a spunlaced method, spunbond method and the like.
  • Exemplary properties of the nonwoven fabric are followed: basis weight (g/m 2 );40 ⁇ 70,thickness ( ⁇ m);170 ⁇ 460, longitudinal tensile strength (N/5 cm); 35 ⁇ 380, transverse tensile strength(N/5 cm);13 ⁇ 165, longitudinal extensibility (%); 80 and below and transverse extensibility (%); 120 and below.
  • the watertight layer may be formed by laminating a synthetic-resin film on the nonwoven fabric.
  • exemplary synthetic-resin films include polyolefin resin such as polyethylene and polypropylene; polyamide resin; polyester resin; polyvinyl chloride resin; polystyrene resin; copolymer polyamide resin; copolymer polyester resin; ethylene-vinyl acetate resin; elastmer; and mixed resin of two or more of those resins.
  • the synthetic-resin film may be a single layer or laminated layer.
  • the synthetic-resin film has a thickness of 0.01 to 0.3 mm, preferably 0.02 to 0.1 mm
  • the heat-generating composition preferably has a weight of 30 g or more.
  • a weight ratio of the aluminum powder, the calcium hydroxide powder and the calcium oxide powder of the heat-generating composition is set to 40 ⁇ 60:10 ⁇ 40:10 ⁇ 40.
  • a weight ratio of the aluminum powder, the calcium hydroxide powder and the calcium oxide powder is preferably set to 40 ⁇ 50:15 ⁇ 40:20 ⁇ 40.
  • the aluminum powder preferably has following grain size distribution: ⁇ 45 ⁇ m; 70 ⁇ 95%, 45 ⁇ 63 ⁇ m; 5 ⁇ 20%, 63 ⁇ 75 ⁇ m; 0 ⁇ 5% and +75 ⁇ m; 0 ⁇ 5%.
  • the calcium hydroxide powder preferably has following grain size distribution: ⁇ 45 ⁇ m; 0 ⁇ 10%, 45 ⁇ 75 ⁇ m; 0 ⁇ 30%, 75 ⁇ 150 ⁇ m; 20 ⁇ 45% and +150 ⁇ m; 30 ⁇ 78%
  • the calcium oxide powder preferably has following grain size distribution: ⁇ 75 ⁇ m; 5 ⁇ 25%, 75 ⁇ 150 ⁇ m; 20 ⁇ 40% and +150 ⁇ m; 45 ⁇ 65% or ⁇ 75 ⁇ m; 25 ⁇ 90%, 75 ⁇ 150 ⁇ m; 5 ⁇ 70% and +150 ⁇ m; 0 ⁇ 15%.
  • Examples of the food to be heated include a food such as a retort-packed food, canned drink, boiled egg and lunch bag.
  • the container may have any forms including a bag, box andpan.
  • the exhaust vent is for discharging H 2 and H 2 O produced by the aforesaid heat-generating reaction.
  • a size and number of the vent is selected such that expansion and breakage of the container can be prevented while keeping heat-retaining property.
  • a food heating device utilizing a heat source having preferable heating conditions including rate of temperature rise of the food, risen temperature of the food and duration of the risen temperature under conditions in which a food heating device is typically used, can be provided.
  • a food heating device can be provided which has excellent heat-generating abilities even if temperature of the water to be reacted is low.
  • the present invention shows that heat-generating ability of the heat source can be controlled by water permeability of the inner bag as well as the property of the heat-generating composition.
  • a non water-repellent nonwoven fabric made by 100% rayon, MR-50/PP40, manufactured by Kokko Paper Mfg. Co., Ltd.
  • the nonwoven fabric has the following properties: basis weight (g/m 2 ) ; 50, thickness ( ⁇ m) ; 400, longitudinal tensile strength (N/25 cm) ; 41, transverse tensile strength (N/25 cm); 9.5, longitudinal extensibility (%) ; 27 and below and transverse extensibility (%); 120 and below.
  • the nonwoven fabric is made by a spunlaced method in which columnar water flow injects toward fibers at high pressure to entwine the fibers and thus to produce a nonwoven fabric.
  • the spunlaced method allows a production of a highly flexible napless nonwoven fabric having high drape property.
  • a nonwoven fabric produced by the method is used for livelihood materials such as diaper, medical supplies, food supplies and cleaning supplies.
  • a water-resistant layer (made by polypropylene) was laminated.
  • the water-resistant layer may be made by a heating bonding and the like in exchange for the laminating.
  • the water-resistant layer had a thickness of 40 ⁇ m.
  • Each of the prepared base materials was punched with pinholes in various densities using a pinhole opening machine, which comprised a roller on which needles were arranged at intervals of 3. 0mm in the transverse direction and at intervals of about 2.9 mm in the longitudinal direction and a base material supporting roller confronting to the former roller.
  • a pinhole opening machine which comprised a roller on which needles were arranged at intervals of 3. 0mm in the transverse direction and at intervals of about 2.9 mm in the longitudinal direction and a base material supporting roller confronting to the former roller.
  • another type of the pinhole opening machine may be used, which is provided with needles capable of being heated and the heated needles are made to contact the laminated film to fuse the film, resulting in opening pinholes.
  • the pinhole diameter varied over a range of 0.05 to 0.4 mm.
  • the pinhole density was 1150/100 cm 2 . If the diameter of the pinhole is larger, the small particulate heat-generating composition may be leaked through the pinhole from the bag, causing unfavorable situation. Accordingly, the pinhole diameter should be small (0.05 to 0.4 mm) within the scope showing excellent heat-generating property.
  • Each of the base materials was cut into a piece having a size of 50 mm by 50 mm to prepare a sample for measuring water permeability.
  • FIG. 3 is a drawing showing the water permeable rate measuring method in the present invention.
  • a stainless-steel measuring tank 51 (inside dimension of 335 ⁇ 535 ⁇ 178 mm) was prepared and filled with ion-exchange water of 23 ⁇ 3° C.
  • An in flow pipe 53 from which the ion-exchange water flowed in the tank 51 was formed at the under portion of the side wall of the tank 51 and an overflow pipe 55 was formed at the upper portion of the side wall of the tank 51 .
  • the pipes 53 and 55 were openable and closable by cocks 54 and 56 , respectively.
  • the ion-exchange water was poured into the tank 51 from the inflow pipe 53 and overflowed through the overflow pipe 55 .
  • An outflow pipe 57 (diameter of 19.05 mm) extending downward was formed on the bottom of the tank 51 .
  • the outflow pipe 57 was openable and closable by a cock 58 .
  • the sample base materials S was temporarily attached to the opening of the outflow pipe 57 by a rubber band 59 with the watertight surface of the sample S being upside. Then, the periphery of the sample was closely attached to the pipe by a sealing tape to block the opening with the sample S and then further tightly attached by a water impermeable adhesive tape made by polypropylene.
  • a distance H between the opening of the outflow pipe 57 and the overflow port of the overflow pipe 55 was 270 ⁇ 9.5 mm (head of water).
  • a collection vessel 61 was disposed under the opening of the outflow pipe 57 .
  • the collection vessel 61 was set on a measurement apparatus (not shown, GF-3000, manufactured by A&D Co., Ltd.).
  • the tank 51 was kept the overflow state with the both cocks 54 and 56 opened.
  • the cock 58 of the outflow pipe 57 was opened, the water was collected by the vessel 61 . And, the amount (milliliter) of the collected water was weighed. In this case, after an amount of the permeated water per unit time had got constant (after a variation in amount of the permeated water per 10 seconds was within 5% at least consecutive three times), an amount of the permeated water measured in any one minute during the measurement for one minute or more was defined as a water permeable amount (milliliter). And, a water permeable amount per one minuet per 1 cm 2 of the sample was converted to water permeable rate (milliliter/min/cm 2 ). A specific gravity of the ion-exchange water is set to 1.000 (g/cm 3 ).
  • the air permeability was measured using a gurley type densometer (range; 300 ml, timer;s, t ⁇ 1, a diameter of measuring section; 30 mm, manufactured by Toyo Seiki Seisaku-Sho, Ltd., based on JIS P8117).
  • the measured value (sec/300 ml) was converted to an air permeable rate (milliliter/min/cm 2 ).
  • the prepared six samples having various pinhole diameters were examined for water permeability using the aforesaid measuring apparatus and also for air permeability using the gurley type densometer.
  • Table 1 shows the measured air permeability, air permeable rate converted from the measured air permeability, the measured water permeability and water permeable rate converted from the measured water permeability.
  • FIG. 4 is a graph showing a relation between the air permeable rate and the water permeable rate.
  • the vertical axis indicates the water permeable rate converted from the measured water permeability
  • the horizontal axis indicates the air permeable rate converted from the air permeability measured by the gurley type densometer.
  • the water permeable rate can be expressed by a direct function of the air permeable rate. From the direct function, a ratio of the water permeable rate to the air permeable rate is substantially equal to 1/5.5 in a case of the packing material of the present invention.
  • a heat source was produced using each of the prepared bags. And, a relation between the temperature of the heat source and the air permeability of the bags was examined.
  • the heat-generating composition As the heat-generating composition, a mixed powder of aluminum powder (#280A, manufactured by MINALCO Co., Ltd.) of 20 g, calcium hydroxide powder (tokusen, manufactured by Tage lime industry) of 10 g and calcium oxide powder (manufactured by Tage lime industry) of 20 g and was used.
  • the aluminum powder has the following grain size distribution: -45 ⁇ m; 90.80%, 45 ⁇ 63 ⁇ m; 8.30%, 63 ⁇ 75 ⁇ m; 0.64% and +75 ⁇ m; 0.25%.
  • the calcium hydroxide powder has the following grain size distribution: ⁇ 45 ⁇ m; 4.60%, 45 ⁇ 75 ⁇ m; 21.90%; 75 ⁇ 150 ⁇ m; 35.92% and +150 ⁇ m; 37.58%.
  • the calcium oxide powder has the following grain size distribution: ⁇ 75 ⁇ m; 15.68%, 75 ⁇ 150 ⁇ m; 34.24% and +150 ⁇ m; 50.07%.
  • the calcium oxide powder includes the following elements: calcium oxide (measured by an EDTA titration method (NN indicator)); 93% or more, carbon dioxide (measured by a Storelain method); 2.0% and below and impurities (measured by an EDTA titration method, perchloric acid method, absorption spectroscopy); 3.2% or less.
  • the impurities include silicon dioxide, aluminum oxide, ferric oxide and magnesium oxide.
  • the bag having a receptacle for containing the heat-generating composition was produced.
  • the receptacle had a size of 70 mm ⁇ 170 mm.
  • FIG. 5 is a drawing showing the method for measuring the temperature.
  • the heat source 1 a food F (a retort-packed cooked rice and a 350 millilitter-plastic bottled tea, or a retort-packed cooked rice and a retort-packed curry) and water of 130 g were put in a heating bag 31 having exhaust vents 32 .
  • the heating bag 31 was openable and closable and had two exhaust vents 32 having a diameter of 5 mm.
  • the heating bag 31 was supported in a stainless-steel container 73 set on a heat insulating material 71 .
  • a temperature T 1 in the heating bag 31 steam temperature
  • a temperature T 2 of the heated water an environmental temperature T 3 and a temperature T 4 of the food were measured by the measuring apparatus D.
  • Table 2 shows a result whether the samples satisfied the heating conditions.
  • condition B condition C 40° C. or higher 50° C. or higher 60° C. or higher after 5 min. after 5 min. after 5 min. after 5 min. 60° C. or higher 60° C. or higher 65° C. or higher after 10 min. and after 10 min. and after 10 min. and after 10 min. and after 10 min. and and Sample 60° C. or higher 65° C. or higher 65° C. or higher No. after 20 min. after 20 min. after 15 min. 1 ⁇ x x 2 ⁇ ⁇ ⁇ 3 ⁇ ⁇ ⁇ 4 ⁇ ⁇ ⁇ 5 ⁇ x x 6 x x x x x x
  • Temperature of the heat source can be controlled by the air permeable rate of the bag.
  • the air permeable rate of the bag required for heating a food is 110 to 340 milliliter/min/cm 2 (water permeable rate is about 24 to 44 milliliter/min/cm 2 ).
  • a preferable water permeable rate of the bag for heating a food is 13 to 81 milliliter/min/cm 2 .
  • the heat-generation of the heat-generating composition is caused by a heat-generating reaction of the aluminum after a formation of alkaline environment resulting from hydrolysis of the calcium hydroxide, as described above, and also by a heat-generating reaction of the aluminum activated by a heat-generating resulting from a hydration reaction of the calcium oxide.
  • a low-temperature (low-water temperature) condition either one of the heat-generating reactions alone will not generate sufficient amount of heat.
  • rate of temperature rise becomes better.
  • Ca(OH) 2 produced by a hydration reaction of CaO does not have so high water-solubility because the water temperature rises rapidly to 70 to 80° C. due to heat generated by the aforesaid hydration reaction. Accordingly, although hydrolysis rate is rapid, it requires a longer time until the pH sifts toward alkalis.
  • Each of the sample heat-generating compositions was enclosed with the bag made of base material (a non water-repellent nonwoven fabric (made by 100% rayon, MR-50/PP40,manufactured by Kokko Paper Mfg. Co., Ltd.) having a water permeable rate of about 40 to 44 milliliter/min/cm 2 ) used for measurement of the water permeability.
  • base material a non water-repellent nonwoven fabric (made by 100% rayon, MR-50/PP40,manufactured by Kokko Paper Mfg. Co., Ltd.) having a water permeable rate of about 40 to 44 milliliter/min/cm 2 ) used for measurement of the water permeability.
  • base material a non water-repellent nonwoven fabric (made by 100% rayon, MR-50/PP40,manufactured by Kokko Paper Mfg. Co., Ltd.) having a water permeable rate of about 40 to 44 milliliter/min/cm 2 ) used for measurement of
  • a retort-packed rice was measured in temperature in such a manner that a stick type temperature sensor was inserted into the center of the retort-packed rice. Then, whether the samples satisfied the heating condition D (to heat the retort-packed rice to 60° C. or higher after 25 minutes) and condition E (to heat the retort-packed rice to 65° C. after 25 minutes) was discussed.
  • Table 3 shows results whether the samples satisfied the heating conditions.
  • the food heating condition D (to heat the retort-packed rice to 60° C. or higher after 25 minutes) is satisfied when the aluminum powder, calcium hydroxide powder and calcium oxide powder has an amount ratio of 40 ⁇ 60:10 ⁇ 40:10 ⁇ 40.
  • the food heating condition E (to heat the retort-packed rice to 65° C. or higher after 25 minutes) is satisfied when the aluminum powder, calcium hydroxide powder and calcium oxide powder has an amount ratio of 50 ⁇ 60:10 ⁇ 20:20 ⁇ 35.
  • a weight of the heat-generating composition Concerning a weight of the heat-generating composition, the following measurement was carried out.
  • the heat-generating composition containing the aluminum powder, calcium hydroxide powder and calcium oxide powder with an amount ratio of the aluminum powder, calcium hydroxide powder and calcium oxide powder being 50:15:35 was enclosed in the bag to prepare the heat sources each having a weight of 30 g, 40 g, 50 g and 60 g.
  • Each of the heat sources was examined in temperature measurement. As a result, all of the heat sources showed substantially the same heat-generating ability. Therefore, a weight of the heat-generating composition is preferably 30 g or larger.
  • FIG. 1 is a drawing showing a structure of a heat source according to the present invention
  • FIG. 1A is a plane drawing
  • FIG. 1B is a cross-section drawing.
  • the heat source 1 comprises a bag 10 and a heat-generating composition 20 enclosed in the bag 10 .
  • the bag 10 is made of a non water-repellent nonwoven fabric 11 (100% rayon, MR-50/PP40, manufacturedbyKokko Paper Mfg. Co., Ltd.). Almost full area of the bag 10 is punched with pinholes 15 in substantially the uniform density.
  • the pinhole 15 has a diameter of 0.1 to 0.3 mm.
  • the bag 10 has a water permeable rate, measured by the aforesaid method (as shown in FIG. 3 ), of about 40 milliliter/min/cm 2 .
  • the water permeable rate can be converted from the air permeable rate measured by the gurley type densometer.
  • the bag 10 has a size of 70 mm ⁇ 170 mm.
  • the heat-generating composition 30 is a mixed powder of aluminum powder (#280A, manufactured by MINALCO Co., Ltd.) of 25 g, calcium hydroxide powder (tokusen, manufactured by Tage lime industry) of 7.5 g and calcium oxide powder (manufactured by Tage lime industry) of 17.5 g (an amount ratio of aluminum:calciumhydroxide:calciumoxide is 50:15:35. A total weight is 50 g).
  • the heat-generating composition 20 is enclosed in the bag 10 to produce the heat source 1.
  • Example 2 The same heat-generating composition as that of Example (an amount ratio of aluminum:calcium hydroxide:calcium oxide is 50:15:35. A total weight is 50 g) was enclosed in the bag 10 having a water permeable rate of about 81 milliliter/min/cm 2 to produce another heat source 3 .
  • FIG. 2 is a drawing showing a heating device according to the present invention.
  • the heating device is used for heating a retort-packed cooked rice and a retort-packed cooked curry.
  • the food heating device 30 comprises a heating bag (container) 31 having exhaust vents 32 ; the heat source 1 shown in FIG. 1 and water W for activating a heat-generating reaction.
  • a heating bag (container) 31 having exhaust vents 32 In this embodiment, two circular exhaust vents 32 having a diameter of 5 mm are formed. Or, two to four exhaust vents 32 having a diameter of 3 to 7 mm may be formed. Depending on the container, one to two exhaust vents having a diameter of 10 to 15 mm, or eight to ten exhaust vents having a diameter of 1 to 2 mm may be formed.
  • the shape of the exhaust vent is not limited to a circular shape; may be any shape capable of venting water vapor and hydrogen gas. When the bag is a three sided seal pack, the exhaust vent may have a shape formed by turning the opening of the back.
  • the heat source 1 is enclosed in an air-tight outer bag during storing in order to prevent the heat-generating composition from contacting moisture in air.
  • the heat source 1 taken out of the outer bag, the retort-packed cooked rice and the retort-packed cooked curry D were put in the heating bag (container) 31 , water of about 5° C. in an amount of 130 g was added and then the container 31 was sealed.
  • the heat source 1 caused a heat-generating reaction to heat the retort-packed cooked rice and retort-packed cooked curry Din the container 31 .
  • Water vapor and hydrogen gas produced by the heat-generating reaction were vent through the exhaust vents 32 .
  • the retort-packed cocked rice was heated to 67.3° C. And, leakage of the heat-generating composition did not occur.
  • the heat source 3 was used in exchange for the heat source 1 .
  • the heat source 3 taken out of the outer bag, and 350 milliliter-plastic bottled tea D were put in the heating bag (container) 31 , water of about 20° C. in an amount of 130 g was added and then the container 31 was sealed.
  • the heat source 3 taken out of the outer bag, and a retort-packed cooked rice D were put in the heating bag (container) 31 , water of about 5° C. in an amount of 130 g was added and then the container 31 was sealed.
  • FIG. 6 is a graph showing a relation between the measurement time and temperatures.
  • non water repellent nonwoven fabric In exchange for the aforesaid non water-repellant nonwoven fabric, another type of non water repellent nonwoven fabric maybe used, for example, CO40s (manufactured by Unitika Co., Ltd.), which has the following properties: basis weight (g/m 2 ); 40, thickness ( ⁇ m); 330, longitudinal tensile strength (N/5 mm); 35, transverse tensile strength (N/5 mm); 15, longitudinal extensibility (%); 25 and transverse extensibility (%); 75.
  • the nonwoven fabric was made by a spunlaced method.
  • a weight ratio of the aluminum power, calcium hydroxide powder and calcium oxide powder, weight of the heat-generating composition and properties are not limited to the aforesaid values.
  • FIG. 1 is a drawing showing a structure of a heat source according to the present invention
  • FIG. 1A is a plane drawing
  • FIG. 1B is a cross-section drawing.
  • FIG. 2 is a drawing showing a heating device according to the present invention.
  • FIG. 3 is a drawing showing the water permeable rate measuring method in the present invention.
  • FIG. 4 is a graph showing a relation between the air permeable rate and the water permeable rate.
  • FIG. 5 is a drawing showing the method for measuring the temperature.
  • FIG. 6 is a graph showing a relation between the measurement time and temperatures.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Food Science & Technology (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Chemical & Material Sciences (AREA)
  • Cookers (AREA)
  • Package Specialized In Special Use (AREA)
  • Packages (AREA)
US12/085,887 2006-04-21 2007-03-12 Food Heating Device Abandoned US20100147282A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2006117741A JP3921550B1 (ja) 2006-04-21 2006-04-21 食品加熱装置
JP2006-117741 2006-04-21
PCT/JP2007/054839 WO2007122900A1 (ja) 2006-04-21 2007-03-12 食品加熱装置

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US (1) US20100147282A1 (ja)
EP (1) EP2011846A1 (ja)
JP (1) JP3921550B1 (ja)
KR (1) KR20080110982A (ja)
CN (1) CN101356249A (ja)
WO (1) WO2007122900A1 (ja)

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US20130226087A1 (en) * 2010-09-15 2013-08-29 David R. King Method and Apparatus for Warming Intravenous Fluids
US20140010483A1 (en) * 2012-07-06 2014-01-09 Kyowa Co., Ltd. Sealing Bag for Hydrogen Gas, and Method for Dissolving Hydrogen Gas
US20140314917A1 (en) * 2011-04-15 2014-10-23 James Richard Allan Pollock Flameless heating composition
US9574764B2 (en) 2012-05-25 2017-02-21 S. C. Johnson & Son, Inc. Portable steam generating device
CN110902158A (zh) * 2019-12-11 2020-03-24 安徽省三车节能科技有限公司 一种提高氧化钙热源在自热食品中的加热效率的方法

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JP2010222006A (ja) * 2007-07-17 2010-10-07 Maikooru Kk 物品加熱装置
WO2009091276A1 (fr) * 2008-01-16 2009-07-23 Obschestvo S Ogranichennoy Otvetstvennost'u 'bargain Production Group' Réchauffeur par contact pour aliments sous emballage
JP5339888B2 (ja) * 2008-12-24 2013-11-13 ダイニック株式会社 発熱性成形体
KR101102502B1 (ko) 2010-04-29 2012-01-05 주식회사 다인 발열제 조성물
US10863848B2 (en) * 2013-03-15 2020-12-15 Iceburg Point Ventures, LLC Cooking apparatus using liquid bath
WO2015119313A1 (ko) * 2014-02-07 2015-08-13 (주)크라우젠 파우치
CN103844891A (zh) * 2014-03-12 2014-06-11 南华大学 快速煮蛋装置
WO2015166940A1 (ja) * 2014-04-28 2015-11-05 高木　毅 包装容器
CN106833547B (zh) * 2017-02-07 2019-11-01 宁波工程学院 一种食品加热用自热剂及其包装
JP7110690B2 (ja) * 2017-04-13 2022-08-02 ライオン株式会社 非水系発熱組成物及び温熱製品

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CN110902158A (zh) * 2019-12-11 2020-03-24 安徽省三车节能科技有限公司 一种提高氧化钙热源在自热食品中的加热效率的方法

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EP2011846A1 (en) 2009-01-07
JP3921550B1 (ja) 2007-05-30
JP2007291163A (ja) 2007-11-08
KR20080110982A (ko) 2008-12-22
WO2007122900A1 (ja) 2007-11-01

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