This invention relates to a method of extending the heating time of the heat generating material, and more particularly, heat generating material By injecting air in the closed container with the present invention relates to a method of extending the heating time of the heat generating material. When used as a way of extending the heat generating time of the heat generating material to heat packs, heating jacket or heating cushion, heating time is extended it is possible to manufacture a product that can be used for a long time in cold weather. In the present invention, the heat generating material to be injected with the air in the closed container is a hydrate of sodium acetate, is dissolved in a supersaturated state in a solvent. ; in a conventional way by inserting a heat pack of the elastic vibrating body to induce crystallization rapidly given a physical impact on the heat generating substance and, unlike the addition of air in a volume of pyrogen sodium acetate trihydrate promote hydration of the chemical was used to induce crystallization, and a long time for the heat to be released from the crystallization process for a long time. Was also to be implemented in a variety of colors as a function of temperature by the addition of a predetermined amount of dye Zion, by inserting the insulating cushion provides a user of the portable convenience and mobility.
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