Heat generating body

1. A heat generating body wherein three or more plural sectional exothermic parts are provided at intervals via a sectioned part which is a heat seal part, characterized in that:

the sectional exothermic parts have a heat generating composition capable of causing heat generation upon contact with oxygen in air and are at least constituted of three kinds of a low temperature sectional exothermic part, a middle temperature sectional exothermic part and a high temperature sectional exothermic part;

a maximum temperature of the high temperature sectional exothermic part is higher than a maximum temperature of the low temperature sectional exothermic part;

a maximum temperature of the middle temperature sectional exothermic part is laid between a maximum temperature of the high temperature sectional exothermic part and a maximum temperature of the low temperature sectional exothermic part; and

the middle temperature sectional exothermic part is constituted of plural sectional exothermic parts having a different maximum temperature.

2. The heat generating body according to claim 1 , characterized in that:

the heat generating composition is a moldable heat generating composition which contains, as essential components, an iron powder, a carbon component, a reaction accelerator and water, does not contain a flocculant aid, a flocculant, an agglomeration aid, a dry binder, a dry binding agent, a dry binding material, a sticky raw material, a thickener and an excipient, contains surplus water so as to have a water mobility value of from 0.01 to 20, has moldability due to the surplus water which is a connecting substance, with the water in the heat generating composition not functioning as a barrier layer, and is capable of causing an exothermic reaction upon contact with air;

a heat generating composition molded body as formed by molding the moldable heat generating composition is laminated on a substrate, a covering material is put thereon, and the periphery of the heat generating composition molded body is heat sealed to form the sectional exothermic parts;

the substrate is substantially planar and does not have a pocket, an accommodating division or an accommodating zone;

the heat generating composition molded body has a volume of from 0.1 to 30 cm 3 ;

a ratio of the capacity of the sectional exothermic parts to the volume of the heat generating composition molded body is from 0.6 to 1.0;

the sectioned exothermic parts have a maximum height of from 0.1 to 10 mm;

the sectioned part between the sectional exothermic parts has a width of from 0.3 to 50 mm; and

the substrate or the covering material has permeability to air.

3. The heat generating body according to claim 1 , characterized in that the low temperature sectional exothermic part, the middle temperature sectional exothermic part and the high temperature sectional exothermic part are determined by a center distance method.

4. The heat generating body as set forth in claim 1 , characterized in that the heat generating body has the low temperature sectional exothermic part in end part thereof.

5. The heat generating body according to claim 1 , characterized in that on the surface orthogonal to the thickness of the heat generating body, a bending resistance in at least one direction is not more than 100 mm.

6. The heat generating body according to claim 1 , characterized in that the heat generating body has a fixing measure.