US20090229594A1 - Heat source and heating device - Google Patents

Heat source and heating device Download PDF

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Publication number
US20090229594A1
US20090229594A1 US11/990,538 US99053806A US2009229594A1 US 20090229594 A1 US20090229594 A1 US 20090229594A1 US 99053806 A US99053806 A US 99053806A US 2009229594 A1 US2009229594 A1 US 2009229594A1
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United States
Prior art keywords
water
heat
temperature
heat source
bag
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Abandoned
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US11/990,538
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English (en)
Inventor
Kaoru Usui
Yukio Urume
Hisao Kimura
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, MINE, YUMIKO, URUME, YUKIO, USUI, KAORU
Publication of US20090229594A1 publication Critical patent/US20090229594A1/en
Abandoned legal-status Critical Current

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    • 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
    • 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
    • C09K5/18—Non-reversible chemical reactions

Definitions

  • the present invention relates to a heat source activated by adding water and a heating device to heat a food (cooked food such as a retort-packed food and canned drink) or other supplies such as a hand-towel, using the heat source.
  • a food cooked food such as a retort-packed food and canned drink
  • other supplies such as a hand-towel
  • a heat source activated by adding water As a heat source activated by adding water, a mixture of aluminum powder and calcium oxide powder has been popularly used for a heat-generating composition (referring to Japanese Patent number 3467729, for example). And, a 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.
  • the heat-generating composition is packed with an inner bag made by nonwoven fabric and further tightly packed with a watertight outer bag.
  • the packed 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.
  • the present invention focuses attention on the permeability of the inner bag and the object of the present invention is to provide a heat source capable of a rapid and stable heat-generating reaction and a heating device using the heat source.
  • a heat source comprises a bag and a heat-generating composition containing aluminum powder and calcium oxide powder, packed in said bag, wherein said bag is formed by a packing material made of a base material of nonwoven fabric of which one surface is coated with a watertight layer, said packing material being punctured with a plurality of pinholes and said packing material has a water permeable rate of 45 to 310 milliliter/min/1 cm 2 measured when head of water is 27 cm.
  • a heat-generating composition containing aluminum powder and calcium oxide powder is reacted with water to cause the following heat-generating reaction:
  • the proceeding of the heat-generating reaction is controlled. That is, when a water permeable rate of the inner bag is set to 45 to 310 milliliter/min/1 cm 2 , preferably 45 to 190 milliliter/min/1 cm 2 , and more preferably 60 to 170 milliliter/min/1 cm 2 measured when head of water is 27 cm, preferable temperature conditions including rate of water temperature rise, risen temperature of the water, duration of the risen temperature of water, rate of vapor temperature rise, risen temperature of the vapor and duration of the risen temperature of vapor under conditions in which a heating device is typically used can be obtained. And, leakage of the heat-generating composition from the bag can be prevented.
  • 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, polytrimethylene 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.
  • Basis weight g/m 2
  • 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; elastomer; 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
  • a weight ratio of the aluminum powder to the calcium oxide powder is set to 10:90 ⁇ 60:40.
  • a weight ratio of the aluminum powder to the calcium oxide powder is preferably set to 35:65 ⁇ 50:50.
  • the aluminum powder preferably has following grain size distribution: ⁇ 45 ⁇ m; 35 ⁇ 60%, 45 ⁇ 63 ⁇ m; 15 ⁇ 30%, 63 ⁇ 75 ⁇ m; 5 ⁇ 25% and +75 ⁇ m; 10 ⁇ 28%.
  • the calcium oxide powder preferably has following grain size distribution: ⁇ 75 ⁇ m; 10 ⁇ 55%, 75 ⁇ 150 ⁇ m; 25 ⁇ 55% and +150 ⁇ m; 0 ⁇ 65%.
  • a heating device comprises: a heat source described above; a container having an exhaust vent and water for activating a heat-generating reaction, wherein said heat source is put in said container together with a subject to be heated, said water is added to said container to be reacted with said heat source and the subject is heated by the generated heat.
  • Examples to be heated by the heating device include a food such as a retort-packed food, canned drink, boiled egg and lunch bag, and other supplies such as a hand towel.
  • the container may have any forms including a bag, box and pan.
  • 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 port is selected such that expansion and breakage of the container can be prevented while keeping heat-retaining property.
  • a heat source and a heating device using the same having preferable temperature conditions including rate of water temperature rise, risen temperature of the water, duration of the risen temperature of water, rate of vapor temperature rise, risen temperature of the vapor and duration of the risen temperature of vapor under conditions in which a heating device is typically used, can be provided.
  • 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.
  • FIG. 1 is a drawing showing a structure of a heat source according to the present invention
  • FIG. 1A is a plane drawing and
  • 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 water temperature and measuring time of each sample
  • FIG. 7 is a graph showing a relation between the environmental temperature and measuring time of each sample
  • FIG. 8 are drawings showing a structure of a heating device according to the second embodiment of the present invention.
  • FIG. 8A is a perspective drawing and
  • FIG. 8B is a sectional front drawing;
  • FIG. 9 is a drawing showing the method for measuring the temperature.
  • a non water-shedding nonwoven fabric made by 100% cotton, CO40s/PP40, manufactured by Unitika Ltd.
  • the nonwoven fabric has the following properties: basis weight (g/m 2 ); 40, thickness ( ⁇ m); 330, longitudinal tensile strength (N/5 cm); 35, transverse tensile strength (N/5 cm); 15, longitudinal extensibility (%); 25 and transverse extensibility (%); 75.
  • 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
  • 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 punctured with pinholes in various densities using a pinhole opening machine, which comprises a roller on which needles were arranged at intervals of 3.3 mm in the transverse direction and at intervals of 3 mm in the longitudinal direction and a base material supporting roller confronting to the former roller.
  • a pinhole opening machine which comprises a roller on which needles were arranged at intervals of 3.3 mm in the transverse direction and at intervals of 3 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 density is preferably 2000 to 8000/100 cm 2 , more preferably 3800 to 7100/100 cm 2 .
  • 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 inflow 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 ten samples having various pinhole densities 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 when the both rate are larger. Accordingly, the graph shows that the water permeable rate is correlated with the air permeable rate. From the graph, a ratio of the water permeable rate to the air permeable rate is substantially equal to 1/13 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 calcium oxide powder (manufactured by Tage lime industry) of 30 g and aluminum powder (manufactured by YAMAISHI METALS Co., Ltd.) of 20 g was used.
  • the calcium oxide powder has the following grain size distribution: ⁇ 75 ⁇ m; 11.69%, 75 ⁇ 150 ⁇ m; 29.27% and +150 ⁇ m; 59.04%.
  • the aluminum powder has the following grain size distribution: ⁇ 45 ⁇ m; 43.52%, 45 ⁇ 63 ⁇ m; 19.85%, 63 ⁇ 75 ⁇ m; 18.90% and +75 ⁇ m; 17.73%.
  • the calcium oxide powder consists of the following elements: calcium oxide (measured by an EDTA titration method (NN indicator)); 93% or more, carbon dioxide (measured by a Sutorelain method); 2.0% and below and impurities (measured by an EDTA titration method, perchloric acid method, absorption spectroscopy); 3.2% and below.
  • the impurities include silicon dioxide, aluminum oxide, ferric oxide and magnesium oxide.
  • Sample 8 4000 ⁇ 5000 (milliliter/min/cm 2 ).
  • the bag having a receptacle for containing the heat-generating composition was produced.
  • the receptacle had a size of 90 mm ⁇ 150 mm.
  • FIG. 5 is a drawing showing the method for measuring the temperature.
  • the heat source 1 a food F (retort-packed cooked rice) 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 .
  • the heating bag 31 was supported in a stainless-steel container 73 set on a heat insulating material 71 .
  • a temperature in the heating bag 31 (steam temperature) T 1 , a temperature T 2 of the heated water and an environmental temperature T 3 were measured by the measuring apparatus D.
  • FIG. 6 is a graph showing a relation between the water temperature and measuring time of each sample.
  • FIG. 7 is a graph showing a relation between the environmental temperature and measuring time of each sample.
  • the horizontal axes indicate a measuring time (minute), and the vertical axes indicate the water temperature T 2 ( FIG. 6 ) and environmental temperature T 1 ( FIG. 7 ).
  • the water temperature T 2 of the sample 1 having slow air permeable rate rises rapidly just after the heat-generating reaction; begins to fall down shortly thereafter and falls down to about 40° C. after 20 minutes. And, the water temperature T 2 of the sample 2 having slow air permeable rate, as well sample 1, rises to about 50° C. at a maximum.
  • the water temperature T 2 of each of the samples 3, 4 and 5 having middle air permeable rate rises just after the heat-generating reaction, to 70° C. or higher after 5 minutes and the risen temperatures is maintained for 20 minutes.
  • the water temperature T 2 of each of the samples 6, 7 and 8 having faster air permeable rate rises to 90° C. or higher just after the heat-generating reaction, the risen temperatures is maintained for 10 minutes after 5 minutes and then 80° C. or higher is maintained after 20 minutes.
  • the steam temperature (environmental temperature) T 1 of each of the samples 1, 2, 3 and 4 having slow air permeable rate does not rise to 50° C. or higher.
  • the steam temperature of each of the samples 5, 6, 7 and 8 having fast air permeable rate rapidly rises to 70° C. or higher after 2 minutes and the risen temperature of 70° C. or higher is maintained for about 10 minutes.
  • Table 2 shows a result whether or not the samples satisfied the temperature conditions.
  • the samples 1, 2, 3 and 4 having the air permeable rate of 1300 and below does not satisfy all of the temperature conditions. And, the food (retort-packed cooked rice) of each sample was not warmed. On the contrary, the samples 5, 6, 7 and 8 having the air permeable rate of 1300 to 5000 satisfy all of the temperature conditions. And, the foods were warmed. But, in the sample 8 having the air permeable rate of 4000 or more, the heat-generating composition was leaked through the pinholes of the bag. Because, the sample, having fast air permeable rate, had any large diameter pinholes formed by lapping the pinholes owing to many times of pass of the needles of the pinhole opening machine.
  • 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 1300 to 4000 milliliter/min/cm 2 (water permeable rate is about 100 to 310 milliliter/min/cm 2 ).
  • the sample 4 having the air permeable rate of 600 to 1300 milliliter/min/cm 2 (water permeable rate is about 46 to 100 milliliter/min/cm 2 ) satisfies the aforesaid temperature condition (1) (to keep the water temperature at 80° C. or higher for 13 minutes or more). Accordingly, if the subject to be heated is so small as to be soaked with the water, the sample 4 can heat such subject. Therefore, the water permeable rate of the bag preferable for heating a subject is 45 to 310 milliliter/min/cm 2 .
  • FIG. 9 is a drawing showing the method for measuring the temperature.
  • a disposable paper towel T was attached to an inside surface of a lid 42 of a paper box 41 of which the inside surface was water-resistant processed.
  • the heat source 1 produced by using each of the prepared four samples was put in the paper box 41 .
  • the lid 41 was closed.
  • a weight of the water was 2.6 times of a weight of the heat-generating composition.
  • a temperature T 1 of the paper towel T, a temperature T 2 of the heated water and an environmental temperature T 3 were measured with the measuring apparatus for 3 minutes after the heat-generating reaction.
  • the vapor and hydrogen gas produced by the heat-generating reaction were leaked from the clearance between the body of the box 41 and the lid 42 .
  • Table 3 shows results whether the samples satisfied the temperature conditions.
  • the heat source using either sample satisfies the temperature condition.
  • the sample 1 an amount ratio of 50:50, a total weight of log
  • a heat-generating composition having a low ratio of the aluminum powder to the calcium oxide powder of 10:90 (sample 4) can be used.
  • 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 packed in the bag 10 .
  • the bag 10 is made of a cotton nonwoven fabric 11 (CO40s/PP40, manufactured by Unitika Ltd.) of which inner surface is coated with a water-resistant layer 13 made of polypropylene. Almost full area of the bag 10 is punctured with pinholes 15 in substantially the uniform density.
  • the pinhole 15 has a diameter of 0.2 to 0.4 mm.
  • the bag 10 has a water permeable rate, measured by the aforesaid method (as shown in FIG. 3 ), of 100 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 90 mm ⁇ 155 mm.
  • the heat-generating composition 30 is a mixed powder of calcium oxide powder (manufactured by Tage lime industry) of 30 g and aluminum powder (VA-150, manufactured by YAMAISHI METALS Co., Ltd.) of 20 g.
  • the heat-generating composition 30 is packed in the bag 10 to produce the heat source 1 .
  • FIG. 2 is a drawing showing a heating device according to the present invention.
  • the heating device is used for warming a retort-packed cooked rice.
  • the heating device 30 comprises a heating bag (container) 31 having exhaust vents 32 ; the heat source 1 shown in FIG. 1 and water 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, one to two exhaust vents 32 having a diameter of 10 to 15 mm, or eight to ten exhaust vents 32 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.
  • the heat source 1 is packed 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, and the retort-packed cooked food F were put in the container 31 , water 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 H in 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 H was heated sufficiently. And, leakage of the heat-generating composition did not occur.
  • non water repellent nonwoven fabric In exchange for the aforesaid nonwoven fabric, another type of non water repellent nonwoven fabric may be used, for example, Soflon EMR-50 (manufactured by Kokko Paper Mfg. Co., Ltd.), which has the following properties: basis weight (g/m 2 ); 50.0 ⁇ 5.0, thickness ( ⁇ m); 0.40 ⁇ 0.10, longitudinal tensile strength (N/25 mm); 41.00 ⁇ 10.00, transverse tensile strength (N/25 mm); 9.50 ⁇ 3.00, longitudinal extensibility (%); 27 and below; transverse extensibility (%); 120 and below, longitudinal 5% modulus (n/25 mm); 17.00 ⁇ 7.00 and transverse 50% modulus; 3.10 ⁇ 1.00.
  • the nonwoven fabric was made by a spunlaced method.
  • FIG. 8 are drawings showing a structure of a heating device according to the second embodiment of the present invention.
  • FIG. 8A is a perspective drawing and
  • FIG. 8B is a sectional front drawing.
  • the heating device 40 comprises a heating box (container) 41 , the heat source 1 and water for activating a heat-generating reaction.
  • the heat source 1 is packed 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 comprises a bag 10 and a heat-generating composition 20 packed in the bag 10 , as well Example 1.
  • the bag 10 has a size of 50 mm ⁇ 110 mm.
  • the heat-generating composition is a mixed powder of calcium oxide powder of 5 g and aluminum powder of 5 g (a total weight of 10 g).
  • the heating box 41 is made of a paper of which inner surface is water-resistant processed.
  • the upper face of the box 41 is openable and closeable by a lid 42 .
  • a disposable paper towel T is detachably attached.
  • the heat source 1 taken out of the outer bag, was put in the container 41 , water of 26 g was added and then the lid 42 was closed.
  • the heat source 1 caused a heat-generating reaction to heat the disposable paper towel attached to the inner surface of the lid 42 .
  • Water vapor and hydrogen gas produced by the heat-generating reaction were vent through a clearance between the container 41 and the lid 42 . And, after 3 minutes from the activation of the heat-generating reaction, the paper towel was heated sufficiently.
  • a weight ratio of the aluminum power and the calcium oxide powder, weight of the heat-generating composition and properties are not limited to the aforesaid values.

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JP2005239374 2005-08-22
JP2005-239374 2005-08-22
PCT/JP2006/312579 WO2007023611A1 (ja) 2005-08-22 2006-06-23 発熱体及び物品加熱装置

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US20070278235A1 (en) * 2006-06-01 2007-12-06 Hickey Charles P Wipe heating system
US20140010483A1 (en) * 2012-07-06 2014-01-09 Kyowa Co., Ltd. Sealing Bag for Hydrogen Gas, and Method for Dissolving Hydrogen Gas

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JP2010183925A (ja) * 2007-05-21 2010-08-26 Maikooru Kk 物品加熱装置
CN103844891A (zh) * 2014-03-12 2014-06-11 南华大学 快速煮蛋装置
CN104130754A (zh) * 2014-07-23 2014-11-05 南昌艾瑞科技有限公司 一种快速高效发热剂
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