| 摘要 |
<p>For heating a lengthy to-be-heated material which requires different heat quantities in the longitudinal direction thereof, there is provided a heat-generating pipe of induction type skin effect current along the first parts of said to-be-heated material which require relatively large heat quantities and in which parts the insulated wires are placed in the inside of said heat-generating pipes,and along the second parts of said to-be-heated material which require relatively small heat quantities, the portions of the insulated wires are disposed outside said heat-generating pipes as extension from the inside of said heat-generating pipes of the above-mentioned first parts.</p> |
