| 摘要 |
PURPOSE:To obtain an even outer diameter even though a conductor is of a fine diameter and the thickness of a foamed insulator is thin, and to obtain an adequate adhesion to the conductor, by forming through extrusion while applying a constant pressure with a compressed air from the inner diameter side of a fused resin to cover the conductor. CONSTITUTION:A fused resin 3 is formed in an extrusion process while applying a constant pressure by a compressed air from the inner diameter side of the fused resin 3 to cover, to a conductor 6 near the tip of a nipple 2. As a result, the inner diameter of a foamed insulator is reduced, and an adequate adhesion to the conductor can be acquired. The pressure applied in this case is selected within 1 to 20kgf/cm<2>. |
