Importance

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Abstract

A heating body is provided. The heating body utilizes a heating composition that generates heat when it is brought into contact with oxygen in the air and being controlled easily and correctly in heating temperatures (heating properties). (1) The heating body includes a heating composition housed in a flat air permeable flat bag using an air permeable packaging material formed on one side or both sides thereof. In the heating body, air permeable pores are formed on the packaging material by irradiation of laser rays. The air permeable pores have diameters or circle-corresponding diameters of 0.005 to 2.0 mm. A distance between the centers of the air permeable pores adjacent to each other is 0.1 to 20 mm. The percentage of the area of the air permeable pores to the total area of the laminate sheet is 0.001 to 5%. (2) In the heating body according to the above Item 1, the heating composition may be held by a sheet-like support. (3) A plurality of heating cells made of a heating composition to be heated in contact with oxygen in the air are housed in a plurality of air permeable packaging material, respectively. The spaces are formed by two sheets, where the air permeable packaging material is formed on one side or both sides thereof. In addition, air permeable pores are formed on the air permeable packaging material by irradiation of laser rays on a lamination sheet having a plastic film. The air permeable pores have diameters or circle-corresponding diameters of 0.005 to 2.0 mm. The distance between the centers of the air permeable pores adjacent to each other is 0.1 to 20 mm. The percentage of the area of the air permeable pores to the total area of the laminate sheet is 0.001 to 5%.

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First Claim