| 摘要 |
PURPOSE:To heat a material to be heated uniformly, by a method wherein a plurality of heating strands are stretched in a row across a pair of power source wires for connection of the power source wires, heat working surface is formed of a part excepting for connecting parts of each of the heating strands with the power source wires and both the power source wires are arranged on the outside of the ehat working surface. CONSTITUTION:Molten resin is injected and filled into a dislike molding cavity 13, which is demarcated and formed between split molds 11, 12, from an injection molding machine through a sprue 14 and central gate and solidified. A high-frequency induction heating device 15 is inserted between broken state split molds 11, 12 and a surface layer part of the split molds 11, 12 are made preheatable easily, efficiently and selectively to a desired temperature level. Then a heating device is constituted by connecting a pair of power source wires 17 with each other by stretching a plurality of heating strands 16, which are arranged mutually in a row, across the power source wires 17. A heat working surface 18 is formed of a part excepting for connecting parts of the heating strands 16 each with the power source wires 17, the connecting parts of the heating strands 16 each with the power sourse wires 17 are bent to a heat working surface 18 and both the power source wires are arranged outside of the heat working surface 18.
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