| 摘要 |
PURPOSE:To raise thermal efficiency utilized for fixation of a heat roll of a surface heating type, by constituting so that thermal conductivity of an insulator layer is larger than thermal conductivity of a supporting body, in a heat roll provided with a resistance heating element layer and the insulator layer in order on the supporting body. CONSTITUTION:A supporting body 2 and an insulator layer 4 of a heat roll are formed by a material for satisfying a condition of lambda2<lambda4, where thermal conductivity of them is denoted as lambda2 and lambda4, respectively. According to such a constitution, heat generated in a resistance heating element layer 3 is transmitted to the insulator layer 4 of thermal conductivity lambda4 more than to the supporting body 2 of thermal conductivity lambda2, therefore, thermal efficiency utilized for fixation is elevated, accordingly a warming-up time can be shortened, and the power consumption is also reduced. |
