| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a manufacturing method of electric fusion coupling which can bury a heating wire at a specific interval without moving the heating wire in the forming time, can set the winding density freely, and furthermore, can use a heating wire not covered with a resin and can reduce the cost. SOLUTION: As a manufacturing method of an electric fusion coupling formed by providing a heating wire 2 to the inner peripheral surface of a tubular body, a heating wire 3 is wound around the recessed grooves 2 provided in a spiral form on the outer peripheral surfaces of the cores 1 of a metal mold to form the tubular body, and a molten resin is filled on the cores 1 the heating wires 3 are wound, by the injection, so as to form the tubular body the heating wires 3 are integrated. And after that, the cooled and solidified tubular body is removed by contracting the diameters of the cores 1.</p> |
