Reusable heat pack containing supercooled solution and means for

Details Reusable heat pack containing supercooled solution and means for Reusable heat pack containing supercooled solution and means for

1976-08-02

1978-03-07

Capossela, Ronald C.

Stoves and furnaces

Heaters

Chemical

62 4, 23301, 126400, 165DIG4, F24J 100

Patent

active

040773906

ABSTRACT:
A heat pack is made by enclosing supercoolable aqueous sodium acetate solution together with a metallic activator strip in a sealed, flexible container. The activator strip is a flexible metal strip having one or more fissures or slits extending therethrough.
To prepare the heat pack for activation, its contents are first heated to a temperature above the melting point of sodium acetate to completely melt it. Thereafter, the sodium acetate solution is supercooled. Activation or crystallization of the sodium acetate (with evolution of heat) is produced by bending the activator strip.

REFERENCES:
patent: 1384747 (1921-07-01), Eckelmann et al.
patent: 1385074 (1921-07-01), Ferguson
patent: 1920853 (1933-08-01), Ferguson
patent: 2220777 (1940-11-01), Othmer
patent: 2386654 (1945-10-01), Caldwell

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