| 摘要 |
PURPOSE:To provide a very smooth surface state by an injection molder by a method wherein a floating core having the dimension, which allows the passing within a mold cavity, is proceeded in molten resin from the pressurizing port of the mold cavity by being pushed by pressurizing fluid. CONSTITUTION:Molten resin 8 is injected from an inlet 3 in a mold cavity 2 by the amount, which is a little much more than the amount required for a hollow product. Next, a floating core 6 is pushed from a pressurizing port 4 in molten resin 8 by pressurizing fluid 9. Thus, the floating core 6 is firstly moved along the central part of the resin 8 under molten state or the part, the viscosity at which is comparatively low, towards an outlet 5. At this time, the floating core 6 pushes the molten resin locating ahead against the inner surface of the mold cavity 2, resulting in pushing the remaining molten resin out through the outlet 5. Accordingly, the resin having uniform thickness is left on the inner surface of time mold cavity 2 after the passing of the floating core 6 along the center of the resin, resulting in successively producing hollow part 10 having the inner diameter nearly equal to the diameter of the floating core 6. |
