| 摘要 |
PURPOSE:To adjust wall thickness in the circumferential direction of a synthetic resin tube simply by displacing the shaft core of a forming tube to the shaft core of a supporter ring toward the thick side from the thin side of the synthetic resin tube. CONSTITUTION:The inside diameter of a synthetic resin tube 5 cylindrically extruded through extrusion molding is arranged by a supporter ring 2, and the outside diameter of the synthetic resin tube 5 is arranged by a forming tube 3. The shaft core of the forming tube 3 is displaced to the shaft core of the supporter ring 2 toward the thick side from the thin side of a synthetic resin tube 6 at that time, thus adjusting the wall thickness of the synthetic resin tube 5, then acquiring the synthetic resin tube 6 having uniform wall thickness. |
