PURPOSE: To prepare the title structure obtaining a stable heat generating characteristic without generating the segregation or lump of a heat generating composition, light in wt. and made usable with a soft feeling, by receiving the heat generating composition having a fibrous iron material partially contained therein in a support bag having air permeability.
CONSTITUTION: A support bag 10 is molded using a sheet obtained by laminating an outer layer 1 composed of a nonwoven fabric to an inner layer 12 composed of a polyethylene film and hermetically sealed by heat-sealing the united part 13 thereof and vent holes 14 are provided to the front and back surfaces of said sheet. A heat generating composition 20 is composed of a mixture prepared by adding a fibrous iron material 21, sodium chloride/activated carbon (reaction aid) 13, diatomaceous earth (water holding agent) 4 and calcium hydroxide (reaction suppresser) 25 to water and received in the support bag 10. Since the fibrous iron material is partially contained in the heat generating composition, segregation due to the mutual entanglement of fibers is hard to generate and the heat generating composition is hardly solidified into a lump since a large space is held therein and a stable heat generating characteristic is obtained without loosing a soft feeling.
OKI MITSUO
MUNAKATA YOSHIKAZU
IMAI SHUJI
NIPPON SEIKO KK
CHITOSE SANGYO KK