SELF-HEATING OR SELF-COOLING CONTAINERS

摘要

A self-heating metal can (10) has an indented base (16) defining an external cavity (20) which is utilised to contain heating means. The heating means comprises quicklime (26) filled within a first chamber (28) and water within a second chamber (32) of the cavity (20). A breakable membrane (24) separates the two chambers (28, 32) and the second chamber (32) is closed by closure (30). Depression of a button (50) of the closure moves an elongate piercing member (42) to pierce the membrane (24) so that water from the chamber (32) flows over the quicklime (22) to cause the exothermic reaction.