Structure of warmer
AssigneeAsahi Kasei Kogyo Kabushiki Kaisha
InventorsIwao Yamashita, Miyuki Shimizu
Life of this patent
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Abstract
A unified structure of a warmer is obtained by accommodating an exothermic composition consisting of iron powder, a chloride or sulfate of a metal having a tendency of ionization greater than iron, active carbon and water in a bag composed of a cloth or cloths and a film or films having aeration holes and encapsulating the resulting warmer in an air-tight envelope. Heat of oxidation of iron powder is utilized for the purpose for creating and keeping warmth.
Claims15
A unified structure of a warmer and an air-tight envelope which is used to encapsulate sealingly said warmer at non-service time, said warmer comprising means for enclosing an exothermic composition in contact with water, said means comprising a two layered bag composed of at least one air-permeable cloth layer and at least one impermeable film layer having aeration holes with a predetermined total area and arranged one within the other;
- said enclosing means being disposed within said air-tight envelope;
- and said exothermic composition which is activated on contact with air being selected from the group consisting of iron powder, a chloride and a sulfate of a metal having an ionization tendency greater than iron and active carbon filled in said bag, whereby upon opening of said airtight envelope, air contacts said exothermic composition and water to produce heat.
A unified structure of a warmer and an air-tight envelope, said warmer comprising means for enclosing an exothermic composition in contact with water, said means comprising a three layered bag composed of at least one air permeable cloth layer, a stupe layer provided on one side of said bag, and at least one impermeable film layer having aeration holes with a predetermine total area and arranged one within the other;
- said enclosing means being disposed within said air-tight envelope;
- and said exothermic composition which is activated in contact with air being selected from the group consisting of iron powder, a chloride and a sulfate of a metal having an ionization tendency greater than iron, and active carbon, filled in said bag, whereby upon opening of said airtight envelope air contacts said exothermic composition and water to produce heat.
Dependencies are inferred from the claim text.