Self-heating can

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A self heating can
A self-heating can is an enhancement of the common food can. Self-heating cans have dual chambers, one surrounding the other. The inner chamber holds the food or drink, and the outer chamber houses chemicals that undergo an exothermic reaction when combined. When the user wants to heat the contents of the can, they pull a ring on the can that breaks the barrier separating the chemicals in the outer chamber. After the heat from the reaction has been absorbed by the food, the user can enjoy a hot meal or drink.
Self-heating cans offer benefits to campers and people without access to a microwave oven, stove or camp-fire, but the technology is not yet common. This is because self-heating cans are considerably more expensive than the conventional type, and also have problems with uneven heating of their contents.
Contents
1 History
2 Technology
3 References
4 See also
5 External links
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History
Self-heating tins started being produced around 1900 for use by mountaineers and explorers. Hiram Bingham used self-heating cans produced by the Silver's and the Grace Brothers firms during travels in 1909-1915.[1]
In 1910, aerial pioneer Alan R. Hawley reported that, on the flight of the balloon America II they had taken "three cans of soup, self-heating with lime".[2]
In 1941 a New York Times food column reported:
Yesterday, we had our first cup of coffee, our first baked beans and our first spaghetti out of the amazing self-heating cans now being introduced by a department store in Manhattan... There's a fifteen-minute wait while the canned food, enclosed in an outer tin, heats without benefit of gas, electricity, or flame of any sort. This trick is accomplished by a chemical inside the first container, and the action is started when four holes are punched in the bottom. The whole mysterious apparatus is turned upside down for the stipulated number of minutes, then righted, and presto! there is your steaming coffee, or food, all ready to serve.
姊�/br> The Self-heating cans also appeared in the second World war British rations.
In 1947, the same column reported "Food in Self-Heating Cans Reappears" (their having been reserved for the military during the war). Referring to the cans as "Hotcans," the columnist noted that "Chocolate is made with milk and is delicious (65 to 72 cents). Four hamburgers in tomato sauce with mushrooms are small but good, and the sauce is ample (89 to 98 cents). Coffee tastes something like the instantly brewed type, leaving something to be desired (49 cents)."[4]. (49 cents in 1947 is approximately equivalent to $4.64 in 2005).
The technology reappeared in the USA again in 2006, when Ontech corporation released a line of self-heating drinks (such as hot cocoa and hot coffee) which use a mixture of quicklime and water to generate heat.
Technology
The source of the heat for the self heated can is an exothermic reaction that the user initiates by pressing on the bottom of the can. The can is manufactured as three containers. A container for the beverage surrounds a container of calcium oxide (quicklime) that is separated from a container of water by a thin breakable membrane. When the user pushes on the bottom of the can, a rod connected there pierces the membrane, mixing the water and calcium oxide. The resulting chemical reaction releases heat (the heat of hydration of calcium oxide) and thus warms the beverage above it.[5]
Another way, though less effective, is copper sulfate and zinc, no gas is produced by this reaction and zinc sulfate and copper is left. Not much heat is produced by this reaction, therefore it is only good if there is a large amount of the reactants and little coffee.
Anhydrous calcium chloride and water are used in the line of self heating cups provided under the brand name Rocket Fuel in the UK.
References
^ Bingham, Hiram. "Inca Land". http://www.gutenberg.org/files/10772/10772-h/10772-h.htm.
^ "Lionized in Montreal," The New York Times, October 29, 1910, p. 1
^ Holt, Jane (1941) "News of Food: War Emphasizes Benefit of Prune Vitamins--Hammering Opens Oysters," The New York Times, March 26, 1941, p. 19
^ Nickerson, Jane (1947), "News of Food: Food in Self-Heating Cans Reappears Here; Recommended for Motorists and Campers," The New York Times, November 26, 1947, p. 28
^ Container with integral module for heating or cooling the contents - Patent 5461867
See also
Flameless ration heater
Beverage can
External links
Self-heating by Bargan Production Group
An article on the concept
Single-serving coffee can heats itself
Will Self-Heating Coffee Be Cool?
The world's first self-heating coffee with demonstration pictures
Dawn of the New Can
BBC News Online - Hot drink can tested in...(and so on)

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