| 摘要 |
There is provided a heat generating body which by forming a temporary adhering part upon temporary adhesion between a substrate and a heat generating composition molded body and a covering material with an adhesive layer and subsequent heat sealing, realizes higher line speed, thereby largely improving the productivity, does not generate position deviation of the heat generating composition molded body in welding the substrate and the covering material, is able to be heat sealed and is free from seal failure. A heat generating body as formed by laminating a heat generating composition molded body resulting from molding of a heat generating composition containing, as essential components, an exothermic substance, a carbon component, a reaction accelerator and water and having a water mobility value of from 0.01 to 20 on a substrate, covering by a covering material and heat sealing the periphery of the heat generating composition molded body, is characterized in that the substrate and the covering material are temporarily adhered with a sticky layer, the temporarily adhered portion is heat sealed with a heat seal layer which the substrate and/or the covering material has, the sticky layer component and the heat seal layer component are co-present in the heat seal part, and the heat seal part has a seal strength at 60° C. of 0.8 kg/25 mm or more.
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