| 摘要 |
PURPOSE:To eliminate the need for dies, etc., and to eliminate the need for a vulcanization stage as well by putting an expandable plastic, water and antifreezing agent into a thermoplastic and sealing the same. CONSTITUTION:The expandable plastic 5 such as soft urethane foam having open cells and the water 6 contg. the antifreezing agent such as diethylene glycol are sealed into double bags 4 made of a thermoplastic resin. A heat mass 3 obtd. in such a manner has the specific heat larger than the specific heat of rubber and requires the smaller weight to obtain the heat mass having the same heat capacity as the heat capacity of the heat mass made of rubber. The needs for dies, etc., is eliminated. The manufacture of the heat masses having the various heat capacities can be executed simply by changing the size of a cylinder 7 and changing the volume of the water 6 mixed with the diethylene glycol to be put into the double bags 4 without the need for the vulcanization stage. The heat mass is thus supplied at the lower cost than the conventional rubber heat mass.
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