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Freezing Cans

Ice Cream on Demand
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Recently while shopping in my local minimart, I found cans of coffee which would become hot once 'aggitated'. Keep them in your bag for a month, and then drink hot coffee whenever you fancy one.

I immediately asked the shopkeeper to mark them for deletion, due to their use of magic and voodoo... but she assured me that they were simply an advancement in drink dispensing technology.

The cans look - in cross section - rather like vacuum flasks containing the coffee in the centre, and two heating agents in the hollow sleeve. Shake the can to activate the heating agents and the coffee in the centre heats up.

So it got me thinking, if self heating cans now exist, it must be time for someone to market the self freezing can.

You'd buy a can of liquid ice-cream which would have several aerosol contraptions on the outside performing two tasks. Firstly they would release cold air towards the outside of the ice-cream container. Secondly, it would thrust the container (which would be set on a spindle) round and round, helping the paddle within to keep the ice-cream mix moving (no movement = no ice-cream texture).

I think this needs an illustration. I'll add one shortly. Anyway, in a nutshell... who wouldn't want cold ice-cream on demand whenever and wherever you wanted it, on a hot day?

Fishrat, May 17 2004

mini cooler using peltier effect http://www.huimao.com/icecube.htm
[dentworth, Oct 04 2004, last modified Oct 05 2004]

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       Nice link Tabs. I'm hoping mine would be a bit more, erm, convenient though!
Fishrat, May 17 2004
  

       We've done self-cooling cans a bunch of times here, and they do exist in the real world.
DrCurry, May 17 2004
  

       DrC, you sound like you need a cold beer. Fire it up, Tabs.
Fishrat, May 18 2004
  

       I'd like to know what chemical or material you would use inside the cooling sleeve. What makes the air cold?
dentworth, May 18 2004
  

       (dentworth) Anything that is liquid under slight pressure at room temperature, and then evaporates fast when you open the sleeve, absorbing heat from the container and propelling the paddles. Say, ¿ether?. With ether you could also sniff the exhaust, with interesting side effects. Or compress Helium terribly, until it liquefies...but no, the can would float away.
finflazo, May 18 2004
  

       //the can would float away//   

       Haven't we been over that before? Once you raise the density of a gas by compressing it, it doesn't lift anymore.   

       Oh, you meant that as a joke? I guess I'm just slow today.
Freefall, May 18 2004
  

       I am out here, but less under-employed than usual. As soon as I've got time, I'll post something.
Fishrat, May 20 2004
  

       apparently it is possible to produce the cooling effect in a small device, but probably not to a freezing temperature.
dentworth, May 29 2004
  

       try mixing Ammonium Thiocyanate with Barium Hydroxide - be warned: poisonous and smelly and itchy
eilathean, Jul 08 2004
  
      
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