| 摘要 |
PURPOSE:To restrict an increasing of temperature, make a small range of distribution of temperature and provide a uniform distribution of temperature by a method wherein some small bags storing thermal accumulation materials and some space portions having no heaters are arranged at the portions where the temperature of the mat is increased. CONSTITUTION:In case that small bags 3 storing latent heat accumulation materials 1 therein and the heaters 5 are uniformly arranged in their longitudinal and lateral directions, the small bags and the heaters showing the maximum temperature are removed, resulting in forming the space part 12, so the temperature of this part is not increased higher than that of the surrounding portion. Due to this fact, a distribution of temperature of an entire amt 4 is made uniform. Uniform distribution of this temperature and an acting of the space part as a heat radiation surface enables a range of allowable temperature to be increased and further even if the material is covered partially by a heat keeping material, it is possible to control the heat-resistant temperature of the excessive cooling preventive material in such a way as it may not exceed the temperature, and further it is possible to prevent an occurrence of phenomenon of excessive cooling. |
