WO1997006391A1 - Flameless heater and method of making same - Google Patents
Flameless heater and method of making same Download PDFInfo
- Publication number
- WO1997006391A1 WO1997006391A1 PCT/US1996/012835 US9612835W WO9706391A1 WO 1997006391 A1 WO1997006391 A1 WO 1997006391A1 US 9612835 W US9612835 W US 9612835W WO 9706391 A1 WO9706391 A1 WO 9706391A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- approximately
- pockets
- grams
- sheets
- powder mixture
- Prior art date
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 43
- 239000000203 mixture Substances 0.000 claims abstract description 37
- 239000000843 powder Substances 0.000 claims abstract description 32
- 235000013305 food Nutrition 0.000 claims abstract description 31
- 238000006243 chemical reaction Methods 0.000 claims abstract description 30
- 239000006227 byproduct Substances 0.000 claims abstract description 15
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 14
- 239000000956 alloy Substances 0.000 claims abstract description 14
- 229920000728 polyester Polymers 0.000 claims abstract description 12
- 239000000945 filler Substances 0.000 claims abstract description 10
- 239000002518 antifoaming agent Substances 0.000 claims abstract description 9
- 239000004094 surface-active agent Substances 0.000 claims abstract description 7
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 17
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 14
- 239000011777 magnesium Substances 0.000 claims description 8
- 239000012466 permeate Substances 0.000 claims description 8
- 239000011780 sodium chloride Substances 0.000 claims description 8
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 7
- 229920005570 flexible polymer Polymers 0.000 claims description 7
- 229910052742 iron Inorganic materials 0.000 claims description 7
- 229910052749 magnesium Inorganic materials 0.000 claims description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 5
- 239000000126 substance Substances 0.000 claims description 5
- 238000009877 rendering Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 claims 5
- 239000011248 coating agent Substances 0.000 claims 1
- 238000000576 coating method Methods 0.000 claims 1
- 229910019089 Mg-Fe Inorganic materials 0.000 abstract description 4
- 230000035699 permeability Effects 0.000 abstract description 3
- 108091006629 SLC13A2 Proteins 0.000 abstract 1
- 238000012045 magnetic resonance elastography Methods 0.000 description 16
- 235000012054 meals Nutrition 0.000 description 11
- 238000010438 heat treatment Methods 0.000 description 8
- -1 polyethylene Polymers 0.000 description 4
- 238000005245 sintering Methods 0.000 description 4
- 239000004698 Polyethylene Substances 0.000 description 3
- 239000011087 paperboard Substances 0.000 description 3
- 229920000573 polyethylene Polymers 0.000 description 3
- 229920000785 ultra high molecular weight polyethylene Polymers 0.000 description 3
- 230000004913 activation Effects 0.000 description 2
- 238000009472 formulation Methods 0.000 description 2
- 239000002985 plastic film Substances 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 235000021183 entrée Nutrition 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
Classifications
-
- 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
Definitions
- the invention relates to a flameless heater utilizing an exothermic chemical reaction to produce heat and a method of making the heater. More particularly, the invention relates to a flameless heater particularly suited for heating U.S. Military field rations and which meets or exceeds the current military performance.
- the U.S. Military has long provided individual field rations in a form known as "Meals Ready to Eat” (“MRE”) .
- An individual MRE package includes an entree pouch containing a food product and a heating pouch containing a mixture of chemicals.
- the heating pouch is militarily referred to as a “Flameless Ration Heater” (“FRH”) .
- the FRH contains a mixture of magnesium with 5 atomic weight percent iron supercorroding alloy powders blended with ultra high molecular weight (“UHMW”) polyethylene powder, fillers, and electrolyte.
- UHMW ultra high molecular weight
- the FRH is manufactured by placing the powder mixture in a mold and heating it for 20 minutes at 168° C.
- the heating of the mixture causes the UHMW polyethylene powder to sinter and adhere to the Mg-Fe alloy, which after cooling forms a strong flexible pad with sufficient porosity to allow water to penetrate it and wet the alloy.
- the pad is packaged in a paperboard envelope having die cut quarter inch holes through each side.
- water is added to the MRE package, it enters the FRH through the holes in the envelope, the alloy and other ingredients in the FRH are wet and an exothermic chemical reaction is initiated.
- the reaction takes the general form of: Mg +2H 2 0 -> Mg(0H) 2 + H 2 + heat (and steam).
- a typical FRH pad is approximately 3.5" x 4.5" x .125" and weighs approximately 21 grams.
- the paperboard envelope adds approximately 9 grams to the overall weight of the FRH.
- the FRH pad When activated with 45-60 milliliters of water, the FRH pad generates enough heat to raise the temperature of an 8 ounce food package by 100° F above its starting temperature within 12 minutes. This is dictated by Military Specification MIL-R-44398B (September 20, 1993) which specifies in part that a flameless ration heater raise the temperature of an 8 ounce meal by 100°F in less than 12 minutes using 30 milliliters of water or less.
- the components of the state-of-the-art FRH are described generally in U.S.
- the weight of the FRH is an important consideration, particularly the heater-to-food weigh ratio which is presently, at best, 1:8. It is always desirable to reduce the total amount of weight which must be carried in the field. Another important consideration is the amount of water needed to activate the FRH. Water is often scarce in the field and every ounce of water in a soldier's canteen is precious under these conditions. It is therefore generally understood that the performance of an FRH is improved by reducing its weight and reducing the amount of water needed to activate it. It is also important to note that virtually millions of FRH units are packed and shipped by the military every month. Therefore, even minor reductions in the overall volume of an FRH can have a large impact on shipping volumes.
- U.S. Patent Number 5,117,809 to Scaringe et al. discloses an improved FRH and method of making it which avoids the need for sintering.
- the FRH described in the '809 patent includes an Mg-Fe alloy which is prepared in a known way, 3% NaCl, and a surfactant which are packaged loose in a heater pad cover or rigid member which provides enough rigidity to hold the particles in place without sintering.
- the heater pad cover is made of a molded rigid polymeric bottom layer and a porous non-woven polypropylene top layer.
- the rigid bottom member provides sufficient rigidity to avoid sintering of the powder and the porous top layer allows water to wet the powder and initiate the reaction.
- Alternative embodiments use a cardboard bottom layer or porous bottom layer with a rigid middle layer.
- a 22 gram FRH according to the '809 patent will, when activated with 26 milliliters of water, produce enough heat to raise the temperature of an 8 ounce food package by 100° F above its starting temperature within 12 minutes.
- the FRH according to the '809 patent is slightly larger than prior FRH units, measuring approximately 5.5" x 4.5" x .1875".
- SHGM Self- Heating Group Meal
- the SHGM described in the '869 patent utilizes a number of heating trays which are provided with stand-offs on their bottom surfaces and a corresponding number of FRH packages which are supported in the trays by the stand-offs. Food pouches are placed directly on top of the FRH packages and water is delivered into the space, created by the stand-offs, between the trays and the FRH packages.
- the trays are typically 13" x 10" x 1.5" deep and use slightly modified versions of the FRH packages (12.75" x 9.75"x .156") described in the above-cited '190 and '809 patents.
- the SHGM system described in the '869 patent does not meet the requirements of Military Specification MIL-R-44398B. Some of the trays cannot be heated more than 80° F and none of the trays will be heated 100° F in less than 30 minutes.
- a flameless heater comprising a first sheet of relatively flexible polymer which is gas and water permeable, a second sheet of relatively flexible polymer which is gas and water permeable, said first and second sheets being bonded to each other so as to form a plurality of pockets, and an effective amount of a powder mixture of chemicals which react exothermically in the presence of water, said powder mixture being substantially evenly distributed among and contained within the pockets.
- the pockets filled with the powder mixture define intervening channels between said pockets, and when water contacts the heater, the water permeates the pockets, wets the powder mixture, and initiates an exothermic reaction in each of the pockets.
- the exothermic reactions generate a heated gaseous byproduct which at least partially inflates the pockets rendering the heater relatively rigid, and the gaseous byproducts exit the pockets through the first and second gas permeable sheets and the gaseous byproducts are directed away from the pockets by the channels.
- a method of making a flameless heater which includes the initial steps of providing a first and second substantially rectangular sheet of relatively flexible polymer which is gas and water permeable and forming spaced-apart pockets in at least one of said sheets.
- the first and second sheets along a plurality of substantially parallel lines and along the periphery thereof are bonded so as to seal the pockets and define intervening channels between the pockets.
- a powder mixture of chemicals which react exothermically in the presence of water is prepared and the pockets are filled with the powder mixture.
- the FRH of the present invention includes two non-woven polyester sheets which are thermally bonded to form a plurality of pockets. Each pocket is filled with a powder mixture of Mg-Fe alloy, NaCl, antifoaming agents, and an inert filler.
- the outer surfaces of the polyester sheets are preferably treated with a food grade surfactant.
- the polyester sheets are gas and water permeable over substantially their entire surfaces and the filled pockets define intervening channels where the polyester sheets are bonded.
- the resulting FRH can be made approximately 50% thinner and 50% lighter than a conventional FRH. In use, both the channels and the permeability of the sheets allow water to wet the powder rapidly and initiate the chemical reactions quickly.
- the byproducts of the chemical reaction cause the pockets to inflate slightly thereby adding sufficient rigidity to the FRH to support a food packet.
- the byproducts of the chemical reactions exit the pockets through the permeable sheets and are directed away from the reaction via the channels. This rapid removal of the byproducts of the reaction enhances the efficiency of the reaction which allows a smaller, lighter FRH to produce the same heat as a larger, heavier FRH.
- a presently preferred embodiment of an FRH according to the invention for use in an MRE package is approximately 5.5" x 4.25" x .0625" and weighs approximately 12 grams.
- the FRH has four parallel pockets, each of which contain a 2.2 gram mixture of MgFe alloy, NaCl, antifoaming agents, and an inert filler. When activated with 30 milliliters of water, the FRH will heat an 8 ounce meal packet to 100°F above its starting temperature.
- a presently preferred embodiment of an FRH according to the invention for use with an SHGM system is simply a scaled up version of the FRH used with an MRE.
- the above-described FRH for use with and MRE has an overall volume of 1.5 cubic inches.
- a standard sized SHGM FRH has a volume of 19.4 cubic inches which is approximately 13 times the volume of the above-described FRH for use with and MRE.
- the heat output of the SHGM FRH according to the invention will therefore be approximately 13 times the heat output of the above-described FRH for use with and MRE. Therefore, it will heat a 6.5 pound meal packet 100°F in 12 minutes.
- a 6.6 pound food pouch can be heated 100°F in 12 minutes.
- Figure 1 is a partially cut away plan view of a first embodiment of the flameless heater according to the invention.
- Figure 2 is a side elevation view of the heater of Figure 1 prior to activation
- Figure 3 is a side elevation view in partial section of the heater of Figures 1 and 2 activated and supporting a food pouch in a tray;
- Figure 4 is a graph illustrating the heat output of the first embodiment of the invention as compared to a prior art heater
- Figures 5a-5e illustrate field use of the first embodiment of the invention in an MRE
- Figure 6 is a view similar to Figure l of a second embodiment of the flameless heater according to the invention.
- Figure 7 is a side elevation view of the heater of Figure 6 prior to activation; and Figure 8 is a side elevation view in partial section of the heater of Figures 6 and 7 activated and supporting a food pouch in a tray.
- a flameless heater 10 is made from a pair of non-woven substantially rectangular gas and water permeable plastic sheets 12, 14.
- the sheets 12 and 14 are thermally bonded along three respective edges 16, 18, 20 and along substantially parallel lines 22, 24, 26 thereby defining four pockets 28, 30, 32, 34.
- the sheets 12 and 14 are approximately 4.25" by 5.5" and their edge seals 16, 18, 20 are approximately .1875" wide.
- the sheets are preferably non-woven polyester which is relatively flexible.
- a mixture of 7.5 grams magnesium with 5 atomic weight percent iron supercorroding alloy is blended with 0.7 grams Cab-O-Sil (inert filler), 0.3 grams antifoaming agents, and 0.3 grams NaCl is prepared.
- the 8.8 gram mixture is evenly divided among the four pockets with each pocket containing approximately 2.2 grams of the mixture.
- the remaining respective edges 36 of the sheets 12, 14 are then thermally sealed so that the powdered mixture is trapped inside the pockets.
- the outer surface of the sheets 12, 14 is then preferably coated with a food grade surfactant which helps water permeate the sheets.
- the assembled heater 10 has a gross weight of approximately 12 grams and an overall thickness of about .0625".
- the filled pockets render the heater 10 somewhat rigid because of the properties of the polymer sheets, although the heater is somewhat flexible because of the parallel welds 22, 24, 26 which define the pockets.
- the heater 10 is used by placing it in a tray 40 or other container as described further herein below and by placing a food pouch 42 on top of the heater 10.
- water When water is added to the container 40, it permeates the sheets 12, 16, and initiates exothermic chemical reactions in the pockets 28, 30, 32, 34.
- the parallel welds 22, 24, 26 which define the pockets also define lower channels 29, 31, 33 between the container 40 and the heater 10 as well as upper channels 29a, 31a, 33a between the heater 10 and the food pouch 42.
- gaseous byproducts of the reactions cause the pockets 28, 30, 32, 34 to inflate slightly rendering the heater 10 more rigid and supporting the food packet 42 above the bottom surface of the container 40.
- the gaseous byproducts of the reactions eventually permeate through the sheets 12, 14 and into the channels between the pockets where they are directed away from the pockets so as to prevent them from impeding the progress of the reactions.
- the heater 10, thus described generates sufficient heat to warm the food packet 42 to 100° F above its starting temperature in less than 12 minutes.
- the performance of the invention is illustrated in the graph of Figure 4 where the vertical axis is the temperature rise in degrees Fahrenheit and the horizontal axis is the elapsed time in minutes.
- the plot A is the temperature rise of a food pouch heated by the invention and the plot B is the temperature rise of a food pouch heated by a current field ration flameless heater.
- the heater 10 may be included as part of an MRE kit 100 as shown in Figure 5a.
- the MRE kit 100 includes a cardboard box 102 which contains a plastic pouch 104 inside which an eight ounce food pouch 42 and the heater 10 according to the invention are both packaged one on top of the other.
- the soldier removes the pouch 104 from the box 102 as shown in Figure 5 b and adds a measured amount of water to the pouch 104 as shown in Figure 5c.
- the pouch 104 is provided with a fill line 106 which indicates the presence of approximately 30 milliliters of water.
- the top of the pouch is folded over and the pouch 104 is returned to the box 102 as shown in Figure 5d.
- the box 102 is then preferably placed on an incline by leaning it against a rock or other object 108 as shown in Figure 5e so that the heater 10 is below the food pouch 42 and the top of the pouch 104 is elevated. After approximately 10-15 minutes, the meal is heated and ready to be removed from the pouches 104, 42.
- FIGS 6 and 7 show a second embodiment of a larger flameless heater 110 according to the invention which is suitable for use in an SHGM system.
- the heater 110 is made from a pair of non-woven substantially rectangular gas and water permeable plastic sheets 112, 114.
- the sheets 112 and 114 are thermally bonded along three respective edges 116, 118, 120 and along substantially parallel lines 122, 124, 126, 128, 130 thereby defining six pockets 132, 134, 136, 138, 140, 142.
- the sheets 112 and 114 are approximately 9.75" by 12.75".
- the sheets are preferably non-woven polyester which is relatively flexible.
- a mixture of 97.5 grams magnesium with 5 atomic weight percent iron supercorroding alloy is blended with 9.1 grams Cab-O-Sil (inert filler), 3.9 grams antifoaming agents, and 3.9 grams NaCl is prepared.
- the 114.4 gram mixture is evenly divided among the six pockets with each pocket containing approximately 19.06 grams of the mixture.
- the remaining respective edges 144 of the sheets 112, 114 are then thermally sealed so that the powdered mixture is trapped inside the pockets.
- the outer surface of the sheets 112, 114 is then preferably coated with a food grade surfactant which helps water permeate the sheets.
- the assembled heater 110 has a gross weight of approximately 156 grams and an overall thickness of about .16".
- the filled pockets render the heater 110 somewhat rigid because of the properties of the polymer sheets, although the heater is somewhat flexible because of the parallel welds 122, 124, 126, 128, 130 which define the pockets.
- the heater 110 is used by placing it in a tray 240 or other container and by placing a 6.6 pound food pouch 242 on top of the heater 110.
- water When water is added to the container 240, it permeates the sheets 112, 116, and initiates exothermic chemical reactions in the pockets 132, 134, 136, 138, 140, 142.
- the parallel welds 122, 124, 126, 128, 130 which define the pockets also define lower channels 133, 135, 137, 139, 141 between the container 240 and the heater 110 as well as upper channels 133a, 135a, 137a, 139a, 141a between the heater 110 and the food pouch 242.
- gaseous byproducts of the reactions When the chemical reactions are activated, gaseous byproducts of the reactions cause the pockets 132, 134, 136, 138, 140, 142 to inflate slightly rendering the heater 110 more rigid and supporting the food packet 242 above the bottom surface of the container 240.
- the gaseous byproducts of the reactions eventually permeate through the sheets 112, 114 and into the channels between the pockets where they are directed away from the pockets so as to prevent them from impeding the progress of the reactions.
- the heater 110 thus described generates sufficient heat to warm the food packet 242 to 100° F above its starting temperature in less than 12 minutes.
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Cookers (AREA)
- Resistance Heating (AREA)
- Physical Or Chemical Processes And Apparatus (AREA)
Abstract
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP50863197A JP3252393B2 (en) | 1995-08-04 | 1996-07-31 | Flameless heater and method of manufacturing the same |
BR9609979A BR9609979A (en) | 1995-08-04 | 1996-07-31 | Flameless heater and process to manufacture the same |
AU68433/96A AU699541B2 (en) | 1995-08-04 | 1996-07-31 | Flameless heater and method of making same |
IL12316196A IL123161A (en) | 1995-08-04 | 1996-07-31 | Flameless heater and method of making same |
CA002228447A CA2228447C (en) | 1995-08-04 | 1996-07-31 | Flameless heater and method of making same |
EP96928816A EP0842383A4 (en) | 1995-08-04 | 1996-07-31 | Flameless heater and method of making same |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/511,561 | 1995-08-04 | ||
US08/511,561 US5611329A (en) | 1995-08-04 | 1995-08-04 | Flameless heater and method of making same |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1997006391A1 true WO1997006391A1 (en) | 1997-02-20 |
Family
ID=24035422
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1996/012835 WO1997006391A1 (en) | 1995-08-04 | 1996-07-31 | Flameless heater and method of making same |
Country Status (8)
Country | Link |
---|---|
US (1) | US5611329A (en) |
EP (1) | EP0842383A4 (en) |
JP (1) | JP3252393B2 (en) |
AU (1) | AU699541B2 (en) |
BR (1) | BR9609979A (en) |
CA (1) | CA2228447C (en) |
IL (1) | IL123161A (en) |
WO (1) | WO1997006391A1 (en) |
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- 1995-08-04 US US08/511,561 patent/US5611329A/en not_active Expired - Lifetime
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- 1996-07-31 AU AU68433/96A patent/AU699541B2/en not_active Expired
- 1996-07-31 BR BR9609979A patent/BR9609979A/en not_active IP Right Cessation
- 1996-07-31 CA CA002228447A patent/CA2228447C/en not_active Expired - Lifetime
- 1996-07-31 EP EP96928816A patent/EP0842383A4/en not_active Withdrawn
- 1996-07-31 IL IL12316196A patent/IL123161A/en not_active IP Right Cessation
- 1996-07-31 WO PCT/US1996/012835 patent/WO1997006391A1/en not_active Application Discontinuation
- 1996-07-31 JP JP50863197A patent/JP3252393B2/en not_active Expired - Lifetime
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EP1055088A1 (en) * | 1998-02-11 | 2000-11-29 | Tempra Technology, Inc. | Liquid heat pack |
EP1055088A4 (en) * | 1998-02-11 | 2005-04-20 | Tempra Tech Inc | Liquid heat pack |
EP2437641A4 (en) * | 2009-06-02 | 2016-08-24 | Reade Mfg Company | Tunable flameless heaters |
Also Published As
Publication number | Publication date |
---|---|
JP3252393B2 (en) | 2002-02-04 |
EP0842383A1 (en) | 1998-05-20 |
BR9609979A (en) | 1999-07-27 |
JPH11511235A (en) | 1999-09-28 |
CA2228447C (en) | 2004-01-20 |
IL123161A0 (en) | 1998-09-24 |
IL123161A (en) | 2000-07-26 |
CA2228447A1 (en) | 1997-02-20 |
EP0842383A4 (en) | 1998-11-11 |
AU699541B2 (en) | 1998-12-03 |
AU6843396A (en) | 1997-03-05 |
US5611329A (en) | 1997-03-18 |
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