Flameless heater and method of making same

Details Flameless heater and method of making same Flameless heater and method of making same

F - Mech Eng,Light,Heat,Weapons

24

J

F24J 1/00 (2006.01) A47J 36/28 (2006.01)

Patent

CA 2228447

A flameless heater (10) includes two non-woven polyester sheets (12, 14) which are thermally bonded along respective edges (16, 18, 20) and parallel weld lines (22, 24, 26) to form a number of pockets (28, 30, 32, 34). 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 (29, 31, 33, 29a, 31a, 33a) where the polyester sheets are bonded. 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 exit the pockets through the permeable sheets and are directed away from the reaction via the channels.

Réchaud sans flamme (10) réalisé à partir de deux couches de polyester (12, 14) non tissé soudées à chaud selon leurs rebords (16, 18, 20) et des lignes parallèles (22, 24, 26) afin de constituer un certain nombre de poches (28, 30, 32, 34). Chaque poche est remplie d'un mélange pulvérulent d'alliage Mg-Fe, de NaC1, d'agents anti-moussage et d'une charge inerte. Les faces externes des couches de polyester sont traitées de préférence à l'aide d'un tensioactif de qualité alimentaire. Ces couches sont perméables aux gaz et à l'eau sur la quasi-totalité de leur surface, tandis que les poches remplies définissent entre elles des chenaux concourants (29, 31, 33, 29a, 31a, 33a), là où les couches sont soudées. Ces chenaux, ainsi que la perméabilité des couches, permettent à l'eau d'humidifier rapidement la poudre et de déclencher les réactions chimiques. Les sous-produits des réactions chimiques s'évacuent des poches à travers les couches perméables en empruntant ces chenaux.

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