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| Wellhead apparatus |
| The invention having been described, what is claimed is: 1. Wellhead apparatus, comprising a tubing ... |
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| Pressure cooker |
| Having described the invention, what we claim is: 1. A pressure cooker comprising an open top body ... |
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| Induction heating apparatus for heating image on recording material |
| The present invention has been made in view of the above-noted problem, and an object thereof is to ... |
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| Heat sink mounting member |
| What is claimed is: 1. A heat sink mounting member for a chassis mount solid state relay comprising:... |
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| Radiation controlling reversible window |
| What I claim is: 1. A glazing assembly, comprising: a thermally insulating glass substrate; a ... |
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| Shell and tube heat exchanger with welds joining the tubes to tube sheet |
| According to one aspect of the invention, there is provided a falling film heat exchanger ... |
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Flameless heater and method of making same
| Details |
Inventors: Lamensdorf, Marc;
Assignee: Truetech, Inc. (Riverhead, NY)
Primary Examiner: Dority; Carroll B.
Assistant Examiner:
Attorney, Agent or Firm: Galgano & Burke
A flameless heater includes two non-woven polyester sheets which are thermally bonded together to form a number 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 heater 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 reactions cause the pockets to inflate slightly thereby adding sufficient rigidity to the heater 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 reactions which allows a smaller, lighter heater to produce the same heat as a larger, heavier heater. By avoiding sintering processes, the heater can be easily and economically mass produced. |
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DETAILED DESCRIPTION It is therefore an object of the invention to provide a flameless heater which weighs less than conventional FRH units.
It is also an object of the invention to provide an FRH which meets or exceeds the performance requirements of Military Specification MIL-R-44398B.
It is another object of the invention to provide an flameless heater which may be manufactured without sintering the component powders.
It is still another object of the invention to provide an FRH which requires less water to activate than conventional FRH units.
It is also an object of the invention to provide an FRH which occupies less volume than conventional FRH units.
It is another object of the invention to provide an flameless heater which does not require a rigid container.
It is still another object of the invention to provide an flameless heater which may be made in various sizes for use in MRE, SHGM or any commercial food package.
Certain of the foregoing and related objects are readily attained in a flameless heater, comprising a first sheet of relatively flexible polymer which is gas and water permeable but will not permit the passage of the powdered ingredients, 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 pocket walls, wets the powder mixture, and initiates an exothermic reaction within each of the pockets.
The exothermic reactions generate a heated gaseous byproduct which 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
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